Patent Application
20200392826
The present invention relates to the technical field of oil-gas exploitation, and specifically to a power supply semi-trailer for electric drive fracturing equipment.
In a configuration mode of a power transmission system used in conventional fracturing equipment on fracturing sites in oil and gas fields all over the world, a diesel engine is connected to a transmission to drive a fracturing plunger pump through a transmission shaft to work. This configuration mode has the following disadvantages: (1) Large volume and heavy weight: When the diesel engine drives the transmission to drive the fracturing plunger pump through the transmission shaft, a large volume is occupied, a heavy weight is involved, the transportation is restricted, and the power density is low. (2). Environmental problems: During operations on a well site, the fracturing equipment driven by the diesel engine would generate engine waste gas pollution and noise pollution. The noise exceeding 105 dBA will severely affect the normal life of nearby residents. (3). Cost inefficiency: The fracturing equipment driven by the diesel engine requires relatively high initial purchase costs and incurs high fuel consumption costs for unit power during operation, and the engine and the transmission also require very high routine maintenance costs. Efforts are made globally to manufacture oil-gas exploitation equipment with “low energy consumption, low noise, and low emission”. Therefore, the foregoing disadvantages of conventional fracturing equipment that uses the diesel engine as the power source impedes the exploitation progress of unconventional oil and gas sources to some extent.
It is a good solution for replacement of conventional diesel engine driven equipment with electric drive equipment. However, high-voltage generators are employed in conventional power supply schemes by generators, i.e., rectifier transformers need to be used to supply power to the rectifying units, while the rectifier transformers are too bulky, expensive, and involve complex wiring. The above features of the rectifier transformers themselves, to some extent, result in the power supply part in the electric drive equipment are bulky, i.e., occupy a large area, expensive, and involve complex wiring, thus greatly limiting the widely use of the electric drive equipment.
Therefore, a power supply semi-trailer for electric drive fracturing equipment is urgently needed that is small in size, low in cost, and simple in wiring.
To overcome the deficiencies in the prior art, an objective of the present invention is to provide a power supply semi-trailer for electric drive fracturing equipment, including a combination of a gas turbine engine, a generator and a rectifying unit, the generator outputs a winding configuration and a voltage required for the rectifying units directly to obviate conventional rectifier transformer equipment. The rectifying unit is connected to the inversion unit through a common DC bus, so that the common DC bus can separately drive multiple inversion units, thus decreasing the wirings of power supply lines. A high voltage inversion unit is disposed on a gooseneck of the electric drive semi-trailer to optimize the spatial arrangement of equipment. The entire power supply equipment has a compact structure, occupies a small area, and is simple in wiring.
The objective of the present invention is achieved by the following technical measures: a power supply semi-trailer for electric drive fracturing equipment, including a power supply semi-trailer body, a gas turbine engine, a generator, a rectifying unit and an inversion unit, wherein the gas turbine engine, the generator and the rectifying unit are integrated on the power supply semi-trailer body; there are one gas turbine engine, one generator, and multiple sets of rectifying units; one end of the generator is connected to the gas turbine engine, the other end of the generator is connected to the rectifying units, the multiple sets of rectifying units are arranged side by side; the inversion unit is disposed on a gooseneck of the electric drive semi-trailer body, there are multiple sets of inversion units, and the rectifying units are connected to the inversion units through a common DC bus.
Further, the generator is a double-winding generator.
Further, the generator outputs a winding configuration and a voltage required for the rectifying units directly.
Further, a phase difference of double winding of the generator is 30°, and the winding configuration is type Y-Y or type D-D.
Further, the power of the generator is 10 MVA or above, and the frequency is 50-60 Hz or 100-120 Hz.
Further, the voltage of the rectifying unit ranges from 4000 VDC to 6500 VDC.
Further, each of the inversion units includes two inverters, and the inverters are three-level inverters.
Further, the inversion units disposed on another gooseneck of the semi-trailer are high voltage inversion units.
Compared with the prior art, the beneficial effects of the present invention are as follows:
1. Employing a combination of a gas turbine engine, a generator and rectifying units, the generator outputs a winding configuration and a voltage required for the rectifying units directly to obviate conventional rectifier transformer equipment.
2. The rectifying units are connected to the inversion units through a common DC bus, so that the common DC bus can separately drive multiple inversion units, thus decreasing the wirings of power supply lines.
3. A high voltage inversion unit is disposed on a gooseneck of the electric drive semi-trailer to optimize the spatial arrangement of equipment.
4. The entire power supply equipment has a compact structure, occupies a small area, and is simple in wiring.
5. The output power of the entire power supply equipment is high, providing a forceful guarantee for the high-power electric drive fracturing equipment.
The present invention will be described in detail below with reference to the accompanying drawings and specific implementations.
Wherein, 1. power supply semi-trailer body, 2. gas turbine engine, 3. generator, 4. rectifying unit, 5. high voltage inversion unit.
As shown in
The inversion units disposed on a gooseneck of the electric drive semi-trailer body are high voltage inversion units 5. The high voltage inversion units 5 are disposed on a gooseneck of the electric drive semi-trailer body to optimize the spatial arrangement of equipment, so that the entire electric drive fracturing equipment has a compact structure, and occupies a small area.
The phase difference of double winding of the generator 3 is 30°, the winding configuration is type Y-Y or type D-D. The alternating voltage output from the generator 3 ranges from 1600 VAC to 2300 VAC.
The power of the generator 3 is 10 MVA or above, the frequency is 50-60 Hz or 100-120 Hz, and the voltage of the rectifying unit 4 is 4000 VDC or above, and further the voltage of the rectifying unit ranges from 4000 VDC to 6500 VDC, ensuring that the power supply semi-trailer has a high output power to drive a high-power electric drive fracturing semi-trailer.
As shown in
It will be appreciated to persons skilled in the art that the present invention is not limited to the foregoing embodiments, which together with the context described in the specification are only used to illustrate the principle of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. All these changes and improvements shall fall within the protection scope of the present invention. The protection scope of the present invention is defined by the appended claims and equivalents thereof.
| Number | Date | Country | Kind |
|---|---|---|---|
| 201910510411.8 | Jun 2019 | CN | national |
