A METHOD FOR MGP NEW ENERGY GRID-CONNECTED CONTROL

Abstract

The invention discloses a method for MGP new energy grid-connected control, wherein, the synchronous motor is connected to a synchronous generator; the new energy module drives the synchronous motor to rotate through a frequency converter; the frequency converter controls the power transmission; and the synchronous motor drives the synchronous generator for grid connection. The present invention has the beneficial effects that: the control method and system provided by the invention can improve the stability and reliability of the grid.

Description

FIELD OF THE INVENTION

The invention relates to a technical field of grid control, in particular to a method and a system for MGP new energy grid-connected control.

BACKGROUND OF THE INVENTION

In recent years, new energy power generation has been developing continuously and received much attention. The characteristics of new energy generation are very different from those of traditional thermal power unit. The biggest difference is that the output power of new energy is fluctuant and uncontrollable. The traditional thermal power unit can be regarded as a power source that uses chemical energy to store energy and can adjust and control output power at any time, however, the new energy often needs the support of the power grid and delivers power to the grid randomly. Such characteristics make it necessary to predict the output power of new energy when MGP is connected to the grid based on power feedback control. On the one hand, the process of prediction will cause the output delay of the control system, on the other hand, if the prediction is not accurate, the stability and reliability of the control system will be affected. Therefore, an improved control method suitable for MGP is necessary to propose, to follow the power fluctuation of new energy according to the power output characteristics of new energy, the DC voltage fluctuation characteristics of grid-connected inverter, and the operation control characteristics and power angle characteristics of MGP. Such characteristics make it necessary to predict the output power of new energy when MGP is connected to the grid based on power feedback control. On the one hand, the process of prediction will cause the output delay of the control system, on the other hand, if the prediction is not accurate, the stability and reliability of the control system will be affected. Therefore, an improved control method suitable for MGP is necessary to propose, to follow the power fluctuation of new energy according to the power output characteristics of new energy, the DC voltage fluctuation characteristics of grid-connected inverter, and the operation control characteristics and power angle characteristics of MGP.

SUMMARY OF THE INVENTION

The purpose of the section is to outline some aspects of embodiments of the present invention and to briefly introduce some of the optimal embodiments. Some simplifications or omissions may be made in the section and in the abstract of the Claims, and the name of the invention to avoid ambiguity as to the purpose of the section, the abstract of the Claims and the name of the invention, and such simplification or omission shall not be used to limit the scope of the present invention.

The present invention is proposed in view of the above possible problems.

Therefore, the present invention is to solve the technical problem that a method for MGP new energy grid-connected control is proposed, which can control the voltage and improve the stability of the grid.

To solve the above technical problem, the invention discloses the following scheme: a method for MGP new energy grid-connected control, wherein a synchronous motor is connected to a synchronous generator; a new energy module drives the synchronous motor to rotate through a frequency converter; the frequency converter controls the power transmission; and the synchronous motor drives the synchronous generator for grid connection.

As a preferred embodiment of the MGP new energy grid-connected control method of the present invention, wherein the frequency converter includes a rectifier and an inverter, and a DC capacitor is included between the rectifier and the inverter.

As a preferred embodiment of the MGP new energy grid-connected control method of the present invention, wherein the new energy module includes a photovoltaic panel or a wind turbine.

As a preferred embodiment of the MGP new energy grid-connected control method of the present invention, wherein the transmission control includes integrating the operating characteristics of all series module and combining their respective characteristics, thus to achieve control by integrating the operating characteristics of all modules.

As a preferred embodiment of the MGP new energy grid-connected control method of the present invention, wherein the photovoltaic panel outputs a direct current, which is subjected to DC/AC conversion and then connected to the grid through an inverter; the wind turbine uses a full-power converter, and the output current of the synchronous generator is connected to the grid after AC/DC/AC conversion.

As a preferred embodiment of the MGP new energy grid-connected control method of the present invention, wherein when the new energy module is a photovoltaic panel, a P-V characteristic curve is obtained through light intensity and ambient temperature, and control over the maximum power point tracking or constant power is executed according to different working occasions.

As a preferred embodiment of the MGP new energy grid-connected control method of the present invention, wherein when the new energy module is a wind turbine, a power output reference of the inverter is calculated based on a wind turbine speed, a pitch angle, and other data and in combination with historical power output data.

As a preferred embodiment of MGP new energy grid-connected control method of the present invention, wherein when the inverter controls the output power to increase, if the power sent by the new energy module is insufficient, then a charging current of a DC capacitor is lower than a discharge current, and a capacitor voltage decreases; when the inverter controls the output power to decrease, if the power sent by the new energy module is excessive, then the charging current of the DC capacitor is higher than the discharge current, and the capacitor voltage increases; if the power sent by the new energy module matches the power transmitted by the inverter, the voltage of the DC capacitor remains stable.

To solve another technical problem, the present invention discloses an MGP new energy grid-connected control system based on which the control method can be implemented.

To solve the above-mentioned technical problem, the present invention provides the following technical solutions: an MGP new energy grid-connected control system, comprising a synchronous motor which can be driven by a new energy module to rotate; a synchronous generator which can be driven by a synchronous motor to achieve grid connection; a frequency converter including a rectifier, an inverter and a DC capacitor, which can control power transmission; a new energy module which drives the synchronous motor through the frequency converter.

The present invention has the beneficial effects that the control method and system provided by the invention can improve the stability and reliability of the grid.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to elaborate the technical solutions described in the embodiments of the present invention, a brief introduction of the drawings used in the description of the embodiments are provided below. Obviously, the drawings in the following descriptions are only for some embodiments of the present invention. For ordinary technicians skilled in the art, other drawings can also be obtained from these drawings without creative work. Wherein:

FIG. 1 depicts the whole process of the MGP new energy grid-connected control method described in the first embodiment of the invention;

FIG. 2 depicts the P-V operating characteristics of the P-V panel described in the invention;

FIG. 3 depicts a schematic diagram of a way to realize DC voltage control of the inverter in the invention;

FIG. 4 depicts a schematic diagram of an MGP control method of a direct-driven wind turbine based on voltage feedback in the invention;

FIG. 5 depicts a schematic diagram of the realization mode of the multi-wind-turbine voltage feedback control strategy of the invention;

FIG. 6 depicts a schematic diagram of simulation results based on the control method mentioned in the invention;

FIG. 7 depicts a schematic diagram of simulation results based on the grid-connected control method of multi-direct-driven wind turbines and MGP;

FIG. 8 depicts the overall structure diagram of the MGP new energy grid-connected control system mentioned in the second embodiment of the invention.

DETAILED DESCRIPTION

In order to make the above-mentioned objectives, characteristics and advantages of the present invention more obvious and understandable, combining the attached drawings of the specification, the embodiments of the present invention will be further described in detail as follows. Apparently, the described embodiments are only part of the embodiments of the present invention, but not all the embodiments. According to the embodiments of the present invention, all other embodiments that the ordinary technicians skilled in the art obtained without creative work, should fall within the protection scope of the present invention.

The following descriptions include many specific details for fully understanding of the present invention, while the present invention can also be implemented in other ways that are different from those described herein, and those skilled in the art can make similar popularization without departing from connotations of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

Secondly, “one embodiment” or “embodiment” referred to herein refers to a specific feature, structure, or characteristic that can be included in at least one embodiment f the present invention. “In one embodiment” described in different places of the specification does not necessarily refer to the same embodiment, nor an embodiment which is separately or selectively exclusive with other embodiments.

The present invention will be clearly described in combination with schematic diagrams. When the embodiments of the present invention are described in detail, to make it easy for presentation, a cross-section view showing a device structure will not be partially enlarged according to the general scale, and the schematic diagram is only used for an example and should not limit the protection scope of the present invention. In addition, consideration of three-dimensional dimensions of length, width and depth should be included in actual production.

In the description of the present invention, it should be noted that the “above, below, inside, and outside” in the terms refer to the direction or position as shown in the attached drawings. The terms are provided only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred therein must have a specific direction, must be constructed or operated in a specific direction, they cannot be construed as a limitation on the present invention. In addition, the terms “first, second, or third” are used for description purpose only, and cannot be construed as indicating or implying relative importance.

In the present invention, unless otherwise clearly specified and defined, the terms including “install”, “join”, and “connect”, should be understood in a broad sense. For example, it can be a fixed connection or a removable connection or integration; it may be mechanical connection or electrical connection or direct connection; also indirect connection through a medium; it may also be internal communication between two components. For ordinary technicians skilled in the art, the specific meaning of the above terms in the present invention can be understood according to the specific context.

Embodiment 1

The FIG. 1 depicts the whole process of the MGP new energy grid-connected control method described in the embodiment of the invention, specifically including the following steps,

S1: the synchronous motor (100) is connected to a synchronous generator (200); S2: the new energy module (400) drives the synchronous motor (100) to rotate through the frequency converter (300).

Wherein, the frequency converter (300) also comprises the rectifier (301) and the inverter (302), and the DC capacitor (303) is arranged between the rectifier (301) and the inverter (302).

The new energy module (400) comprises P-V panels or wind turbines. When the new energy module (400) is connected to the grid through MGP, the whole grid-connected system consists of P-V panels or wind turbines, inverters, MGP and other units, and each unit has own operational characteristics. Therefore, the transmission control comprises the fusion of the operating characteristics of each serial module and the combination of their respective characteristics, and finally integration of the operating characteristics of each module for control.

S3: the frequency converter (300) controls the power transmission; in the embodiment, based on the DC voltage fluctuation characteristics of the new energy grid-connected inverter (302) and the charging and discharging rule of the DC capacitor, the control method of P-V panel+MGP and wind turbine+MGP are proposed.

S4: the synchronous motor (100) drives the synchronous generator (200) for grid connection. The method is called MGP grid-connected control.

The inverter (302) is connected with new energy module (400) and the synchronous motor (100). The P-V panel outputs a direct current which is connected to the grid by a direct/alternating transformation through the inverter (302); the wind turbine adopts a full-power converter, and the synchronous generator (200) outputs through the transformation of AC-DC-AC for grid connection. The inverter (302) can control power transmission. The reference value of power transmission needs to match the power output of the new energy.

Wherein, when the new energy module (400) is the P-V panel, a P-V characteristic curve can be obtained through illumination intensity and ambient temperature, and the maximum power point tracing control or constant power control is carried out according to different working occasions.

When the new energy module (400) is the wind turbine, according to the wind turbine speed, pitch angle and other data, combined with the historical power output data, the power output reference of the inverter is calculated.

When the inverter (302) controls the output power to increase, if the power sent by the new energy module (400) is insufficient, then the charging current of the DC capacitor (303) is less than the discharge current, and the capacitor voltage decreases; when the inverter (302) controls the output power to decrease, if the power sent by the new energy module (400) is excessive, then the charging current of the DC capacitor (303) is greater than the discharging current, and the capacitor voltage increases; if the power sent by the new energy module (400) matches the power transmitted by the inverter (302), the voltage of the DC capacitor (303) remains stable.

Specifically, the P-V operating characteristics of P-V panels are shown in FIG. 2, which comprises stable operating region and unstable operating region. In the unstable operating region, the output power of P-V panels increases with the increase of DC voltage, which monotonically increases; and in the stable operating region, the output power of P-V panels decreases with the increase of DC voltage, which monotonically decreases. Normally, P-V panels are required to operate in a stable operating region, otherwise errors of judgment may occur in control, to result in a collapse.

Because the P-V panel needs to be connected to the frequency converter (300) (including the DC capacitor 303), if the voltage on the DC side of control changes, the output power of P-V panels will change; on the contrary, if the P-V power curve changes because of the change of illumination intensity or temperature, the output power of the P-V panel will also change under the condition of constant DC voltage. In the process of changing illumination, it is usually necessary to make P-V panels run at the maximum power point, i.e., the point MPP in FIG. 2, for maximum power point tracing; the output power of P-V panels can also be flexibly controlled by controlling the DC side voltage.

In the embodiment, the P-V panel is connected to the grid through the inverter (302). Under the condition of constant external illumination intensity and temperature (i.e., constant P-V characteristic curve), assuming that the initial operating point of the P-V power supply is A in the stable operating region, the inverter (302) is required to cooperate with the DC voltage change when the P-V power supply power changes. If the P-V panel output power needs to be increased, the reference output power of inverter (302) can be controlled to increase, the discharge current of DC capacitor (303) will increase, and the voltage of DC capacitor (303) will drop, then the P-V operating point will transition from Point A to Point B; if the P-V panel output power needs to be decreased, the reference output power of inverter (302) can be controlled to decrease, the discharge current of DC capacitor (303) will decrease, and the voltage of DC capacitor (303) will increase, the P-V operating point will transition from Point A to Point C. However, in the unstable operating region, assuming that the P-V power supply works at Point A′, if the demand for P-V power output increases, the output power of inverter (302) increases, the DC capacitor (303) discharges outward, the DC voltage decreases and goes to Point B′, the output goes down instead, and causes the DC voltage to drop until the voltage collapses. Therefore, it is of vital importance to maintain the DC voltage in the stable operating region and ensure the effective control of the DC voltage during the P-V panel operation.

According to the above analysis, the operating characteristics of P-V panels are as follows: the voltage-power relationship is inversely proportional in the stable operating region. The capacitance characteristic of inverter 302 DC side is that the capacitor voltage is related to the charging and discharging speed; the discharge current is greater than the charging current at a certain moment (i.e., when the inverter (302) output power is greater than the DC input power), the capacitor voltage decreases; otherwise, the capacitor voltage increases. The operating characteristics are: active regulation of inverter (302) output voltage frequency can change the source network phase difference, and then adjust the inverter (302) output power. Comprehensively considering the operating characteristics of each unit of the grid-connected system, the output power can be controlled through frequency modulation, and the DC side voltage can be adjusted, then the mode of P-V output power can be adjusted, so as to achieve the effect of MGP tracking P-V output power. As shown in FIG. 3, for the DC voltage feedback control method, the primary output of P-V power generation is DC, when the source power changes, the DC voltage tends to increase or decrease. The frequency converter (300) DC voltage is stabilized as the control goal to change the phase difference of the source network, and to follow the power change at the source end, the method used is similar to the power feedback; the frequency converter (300) output frequency is adjusted to indirectly adjust the phase difference, and then control the power, finally, MGP can follow the power change of P-V output.

When the new energy module (400) is the wind turbine, a control strategy based on voltage feedback control is proposed in the embodiment, the direct-driven wind turbine is connected to the grid through AC-DC-AC frequency converter (including the direct current component), therefore, the embodiment is mainly aimed at direct-driven wind turbines. As shown in FIG. 4, the wind turbine output charges the DC capacitor through uncontrolled rectifier; the control system collects the DC capacitor voltage and takes the DC voltage as the control target, to control the inverter output voltage frequency; the phase difference of MGP source network is adjusted by frequency modulation, to control the power output of MGP system, finally, the transmission power of MGP system can follow the wind turbine output power. In FIG. 4 and FIG. 5, M refers to the synchronous motor (100), and G refers to the synchronous generator (200).

When the new energy module (400) comprises more than one wind turbines, according to the above conclusions, direct-driven wind turbines can converge from the DC side and then drive MGP through the feedback voltage, and a MGP can be used to grid multiple wind turbines in the wind farm. The number of inverters in the wind farm can be reduced if the wind turbine is connected to the grid in the above way; a single inverter is used to replace multiple inverters to increase the reliability of the system. Therefore, as shown in FIG. 5, the rectifiers on the DC side of several wind turbines are connected in parallel, and the MGP is finally driven by an inverter, the control mode is still DC side voltage feedback.

Scenario 1:

To verify the effectiveness of the control strategy, in the embodiment, the control method provided above is used for verification based on simulation, the composition of the simulation system is shown in FIG. 4; the new energy module (400) is a wind turbine, and the output power of the simulated wind turbine is controllable, and the power is transmitted to the DC capacitor through an uncontrolled rectifier; and then the frequency converter (300) drives the synchronous motor (100), and the synchronous motor (100) drives the synchronous generator (200) for grid connection. Simulation and motor parameters are shown in Tables 1 and 2 below.

TABLE 1
Simulation parameters
Parameter/unit         Value
AC system voltage/V    380
Simulated wind turbine 5
maximum power/kW
Synchronous generator  5
capacity/kVA
Synchronous motor      5
capacity/kVA
Power frequency/Hz     50
Lg/Ω                   0.005

TABLE 2
Motor parameters
	Parameter	Value	Parameter	Value
	rs	0.003	rf	0.0003
	Xsl	0.12	Xfl	0.052
	Xd	1.66	Ldl	0.138
	Xq	1.71	Lql	0.07

The simulation process lasts 50s; in the initial stage of simulation, the output power of the simulated wind turbine is provided as 3000W; when the simulation runs to 25s, adjust the output of the simulated wind turbine to 2000W, and measure the output and DC side voltage of synchronous generator (200). The simulation results are shown in Fig. 6. As shown in FIG. 6, after the simulation starts, the MGP system can run stably and follow the output power of the wind turbine; when the simulation reaches 25s, the wind turbine output suddenly decreases, the wind turbine output drops, and MGP generator output power also drops, the wind turbine output can continue to be followed. It can be seen from analysis of DC side voltage of inverter, after the simulation, the DC side voltage of the inverter can always be maintained near the target voltage, when the output power of wind turbine at 25s suddenly changes, the DC voltage also changes, by adjusting the control method, the DC voltage can be maintained near the target voltage, which also ensures that the MGP can follow the output power of wind turbine.

To further verify the control method proposed in the embodiment, the grid-connected control method of multiple direct-driven wind turbines+MGP is also simulated; as shown in FIG. 6, the simulation process lasts 50s, in the initial stage of simulation, the output power of the wind turbine 1 is provided as 1600W, and the output power of wind turbine 2 is 1000W, when the simulation runs to 25s, the output of wind turbine 2 is increased to 1200W, and when the simulation runs to 35s, the output of wind turbine 2 is decreased to 800W, then the generator output and DC voltage are measured. The simulation results are shown in FIG. 7. It can be seen that, the output power of the synchronous generator (200) can follow that of the two wind turbines, and the two wind turbines will not affect each other when the power fluctuates. The DC voltage can also effectively follow the reference value. The effectiveness of the control method is verified.

Embodiment 2

The FIG. 8 depicts the overall structure of the MGP new energy grid-connected control method described in the embodiment of the invention, the MGP new energy grid-connected control method can be realized based on the system. The system comprises the synchronous motor (100), the synchronous generator (200), the frequency converter (300) and the new energy module 400.

The synchronous motor (100) can be driven by the new energy module (400) to rotate.

The synchronous generator (200) can be connected to the grid under the drive of the synchronous motor (100); wherein, the synchronous motor (100) and the synchronous generator (200) can be connected by couplings.

The frequency converter (300) also comprises the rectifier (301), the inverter (302) and the DC capacitor (303), which can control the power transmission.

The new energy module (400) can drive the synchronous motor (100) through the frequency converter (300).

It should be recognized that, embodiments of the invention may be realized or implemented by computer hardware, a combination of hardware and software, or by computer instructions stored in non-transient computer-readable memory. The method can be implemented in a computer program using standard programming techniques (including a non-transient computer-readable storage medium configured with computer programs), wherein the storage medium configured in this way enable the computer to operate in specific and predefined ways—according to the method described in specific embodiments and figures. Each program can be implemented in a high-level process or object-oriented programming language to communicate with a computer system. However, the program can be implemented in assembly or machine language as required. In any cases, the language can be compiled or interpreted. In addition, the program can be run on a dedicated integrated circuit programmed for the purpose.

The procedures described herein in any appropriate order can be followed, unless otherwise indicated or otherwise obviously inconsistent with the context. The procedures described herein (or variations and/or combinations thereof) can be executed under the control of one or more computer systems configured with executable instructions, and can be implemented as code (for example, an executable instruction, one or more computer programs, or one or more applications), hardware, or a hardware combination that execute together on one or more processors. The computer program comprises a plurality of instructions that can be executed by one or more processors.

Furthermore, the method can be implemented in any type of computing platform that is operationally connected to the appropriate one, including but not limited to personal computer, minicomputer, master frame, workstation, network or distributed computing environment, separate or integrated computer platform, or communication with charged particle tools or other imaging devices, etc. The invention may be realized by machine-readable codes stored on a non-transient computer-readable storage medium or device, whether the storage medium is mobile or integrated into a computing platform, such as hard disk, optical reading and/or write-in storage medium, RAM and ROM; the storage medium is readable by a programmable computer, when the storage medium or device is read by a computer, it may be used to configure and operate the computer to perform the procedures described herein. In addition, machine-readable code, or parts of it, can be transmitted over wired or wireless networks. When the medium (combined with a microprocessor or other data processor) is used to implement the procedures described above, the invention comprises these and other different types of non-transient computer-readable storage media. The invention also comprises the computer itself when programming according to the method and techniques described in the present invention. A computer program can be applied to the input data to perform the functions described herein, so that the input data is transformed to generate output data stored in non-volatile memory. The output information can also be applied to one or more output devices, such as a display. In the preferred embodiment of the invention, the transformed data represents physical objects, including a specific visual representation of physical objects produced on the display.

As used in the application, the terms “component”, “module”, “system”, are intended to refer to a computer-related entity, which may be hardware, firmware, a combination of hardware and software, software or running software. For example, a component may include, but not limited to: a process running on a processor, a processor, an object, an executable file, a thread under execution, a program, and/or a computer. For example, both an application running on a computing device and the computing device can be referred to as components. One or more components may exist in a process and/or thread under execution, and the components may be located in one computer and/or arranged between two or more computers. Besides, the components can be executed via various computer-readable media having various data structures. The components can make communication in the form of local and/or remote processes according to the signals having one or more data packets (for example, data from a component that interacts with another component in a local system, a distributed system, and/or interacts with other systems in the form of signals via networks like the Internet).

It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention without any limitation. Although the present invention has been described in detail based on the preferred embodiments, the ordinary technicians skilled in the art should understand that modifications or equivalent replacements is allowed for the technical solutions of the present invention, which should not deviate from the spirit and scope of the technical solutions of the present invention, within the scope of the Claims of the present invention.

Claims

1. A method for MGP new energy grid-connected control is characterized that: a synchronous motor (100) is connected to a synchronous generator (200);a new energy module (400) drives the synchronous motor (100) to rotate through a frequency converter (300),the frequency converter (300) controls the power transmission;the synchronous motor (100) drives the synchronous generator (200) for grid connection.

2. The method for MGP new energy grid-connected control according to claim 1, wherein the method is characterized in that the frequency converter (300) comprises a rectifier (301) and an inverter (302), and a DC capacitor (303) is arranged between the rectifier (301) and the inverter (302).

3. The method for MGP new energy grid-connected control according to claim 1, wherein the method is characterized in that the new energy module (400) comprises a P-V panel or a wind turbine.

4. The method for MGP new energy grid-connected control according to claim 1, wherein the method is characterized in that the transmission control comprises the fusion of the operating characteristics of each serial module and the combination of their respective characteristics, and finally integration of the operating characteristics of each module for control.

5. The method for MGP new energy grid-connected control according to claim 4, wherein the method is characterized in that a P-V panel outputs a direct current which is connected to the grid by a direct/alternating transformation through the inverter (302); the wind turbine adopts a full-power converter, and the synchronous generator (200) outputs through the transformation of AC-DC-AC for grid connection.

6. The method for MGP new energy grid-connected control according to claim 5, wherein the method is characterized in that when the new energy module (400) is the P-V panel, a P-V characteristic curve can be obtained through illumination intensity and ambient temperature, and the maximum power point tracing control or constant power control is carried out according to different working occasions.

7. The method for MGP new energy grid-connected control according to claim 5, wherein the method is characterized in that when the new energy module (400) is the wind turbine, according to the wind turbine speed, pitch angle and other data, combined with the historical power output data, the power output reference of the inverter is calculated.

8. The method for MGP new energy grid-connected control according to claim 5 wherein the method is characterized in that when the inverter (302) controls the output power to increase, if the power sent by the new energy module (400) is insufficient, then the charging current of the DC capacitor (303) is less than the discharge current, and the capacitor voltage decreases; when the inverter (302) controls the output power to decrease, if the power sent by the new energy module (400) is excessive, then the charging current of the DC capacitor (303) is greater than the discharging current, and the capacitor voltage increases; if the power sent by the new energy module (400) matches the power transmitted by the inverter (302), the voltage of the DC capacitor (303) remains stable.

9. A method for MGP new energy grid-connected control is characterized that: the synchronous motor (100) can be driven by the new energy module (400) to rotate;the synchronous generator (200) can be connected to the grid under the drive of the synchronous motor (100);the frequency converter (300) also comprises the rectifier (301), the inverter (302) and the DC capacitor (303), which can control the power transmission;the new energy module (400) can drive the synchronous motor (100) through the frequency converter (300).

10. The method for MGP new energy grid-connected control according to claim 2, wherein the method is characterized in that the new energy module (400) comprises a P-V panel or a wind turbine.

11. The method for MGP new energy grid-connected control according to claim 6, wherein the method is characterized in that when the new energy module (400) is the wind turbine, according to the wind turbine speed, pitch angle and other data, combined with the historical power output data, the power output reference of the inverter is calculated.

12. The method for MGP new energy grid-connected control according to claim 5, wherein the method is characterized in that when the new energy module (400) is the wind turbine, according to the wind turbine speed, pitch angle and other data, combined with the historical power output data, the power output reference of the inverter is calculated.