CN111987737A - Equivalent simulation method and device for doubly-fed fan converter of wind power plant - Google Patents
Equivalent simulation method and device for doubly-fed fan converter of wind power plant Download PDFInfo
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Abstract
The invention relates to the technical field of new energy grid-connected power generation, in particular to an equivalent simulation method and device for a doubly-fed fan converter of a wind power plant.
Description
Technical Field
The invention relates to the technical field of new energy grid-connected power generation, in particular to an equivalent simulation method and device for a doubly-fed fan converter of a wind power plant.
Background
Wind power generation technology is favored because of the cleanliness, non-pollution, relatively mature industrial technology and relatively low cost of generating electricity from wind energy. Due to the characteristics of randomness and intermittence of wind power generation, the wind power generation scale is greatly influenced by the wind speed. At present, a large-scale energy storage technology is not perfect, and reactive power needs to be absorbed from a power grid side when an asynchronous wind driven generator is connected to the power grid. This results in wind energy not being as tunable as conventional energy sources and having a negative impact on the power system. Due to the access of intermittent energy sources, the safety and stability problems of the power system are more and more prominent. Therefore, before a wind farm is built, feasibility analysis needs to be performed. In order to research the power system of the wind power plant, an accurate wind power plant simulation model needs to be established.
In recent years, the wind power generation industry is rapidly developed, the scale of a wind power plant is gradually enlarged, and the grid connection mode is not limited to the initial mode of directly accessing an alternating current power grid, but can be accessed through the traditional high-voltage direct current transmission or the flexible direct current transmission. The scheme of adopting the direct access of the flexible direct current transmission technology has certain advantages, but the influence of the access of the wind power generation system on the operation characteristics of the flexible direct current transmission system is not clear, and the simulation analysis difficulty of the problem is greatly increased by the large-scale wind power generation system.
According to the existing equivalent modeling method for the wind power plant, the wind power plant is aggregated into a group of large-capacity wind power generation units for simulation analysis, but the method cannot simulate the characteristics of wind power plant generator tripping and the like, the number of the wind power generation units is increased, the simulation efficiency is greatly reduced, if the wind power generation unit is a double-fed wind power generator voltage type double-converter topology according to the design scheme of an actual converter, as shown in figure 1, a large number of power electronic switch models exist in a power grid, and a large number of matrix operations caused by frequent change of the states of the switch models exist, so that the simulation analysis of the large-scale power distribution network model is high in complexity, large in operation amount and.
Disclosure of Invention
The invention aims to provide an equivalent simulation method and device for a wind power plant double-fed fan converter, which are used for solving the problem of difficulty in realization caused by high complexity and large operation amount in simulation analysis of the existing large-scale distribution network model.
In order to achieve the purpose, the invention provides an equivalent simulation method of a wind power plant double-fed fan converter, which comprises the following steps:
(1) the method comprises the steps that a machine side converter of a wind power plant is equivalent to a first alternating current controlled voltage source, and a grid side converter of the wind power plant is equivalent to a second alternating current controlled voltage source;
(2) the coupling relation between the machine side converter and the direct current capacitor is equivalent to a first controlled current source which is connected in parallel with two ends of the direct current capacitor, and the coupling relation between the network side converter and the direct current capacitor is equivalent to a second controlled current source which is connected in parallel with two ends of the direct current capacitor;
(3) calculating the control quantity of the first alternating current controlled voltage source according to the fact that the voltage value of the first alternating current controlled voltage source is the same as the alternating current voltage of the alternating current outlet when the machine side converter operates normally;
calculating the control quantity of the second alternating current controlled voltage source according to the fact that the voltage value of the second alternating current controlled voltage source is the same as the alternating current voltage of the alternating current outlet when the grid-side converter operates normally;
And respectively calculating the control quantity of the first controlled current source and the control quantity of the second controlled current source according to the fact that the voltage of the direct current capacitor and the active power of the system are kept unchanged.
The wind power plant double-fed fan converter simulation method has the advantages that the converter is equivalent to an alternating current controlled voltage source, the coupling relation between the converter and a direct current capacitor is equivalent to a controlled current source, and a wind power plant double-fed fan converter simulation model is established after the controlled voltage control quantity is calculated.
Further, according to the fact that the voltage value of each alternating current controlled voltage source is the same as the alternating current voltage of the alternating current outlet when the corresponding converter operates normally, a formula for calculating the control quantity of the first alternating current controlled voltage source and the control quantity of the second alternating current controlled voltage source is as follows:
wherein u issa、usb、uscRespectively, a control quantity u of the first AC controlled voltage source A, B, C phasetIs the voltage of the DC capacitor at time t, m sa、msb、mscA, B, C-phase modulation waves are output by the machine side converter controller respectively; u. ofga、ugb、ugcRespectively, the control quantity m of the second AC controlled voltage source A, B, C phasega、mgb、mgcThe grid-side converter controllers respectively output A, B, C-phase modulation waves.
Further, according to the fact that the voltage of the direct current capacitor and the active power of the system are kept unchanged, the formula for calculating the control quantity of the first controlled current source and the control quantity of the second controlled current source is as follows:
wherein isdIs a controlled variable of the first controlled current source, vsa、vsb、vscInstantaneous values of phase voltages i of the A, B, C phases on the AC side of the machine-side convertersa、isb、iscInstantaneous values of the alternating current i of the A, B, C phases of the machine-side convertergdIs a controlled variable of the second controlled current source, vga、vgb、vgcInstantaneous values of phase voltages i of the ac side A, B, C phases of the grid-side converterga、igb、igcRespectively, ac instantaneous values of the phases of the grid-side converter A, B, C.
The invention provides an equivalent simulation device of a wind power plant double-fed fan converter, which comprises a memory, a processor and a computer program which is stored in the memory and can be operated on the processor, wherein the processor realizes the following steps when executing the program:
(1) the method comprises the steps that a machine side converter of a wind power plant is equivalent to a first alternating current controlled voltage source, and a grid side converter of the wind power plant is equivalent to a second alternating current controlled voltage source;
(2) The coupling relation between the machine side converter and the direct current capacitor is equivalent to a first controlled current source which is connected in parallel with two ends of the direct current capacitor, and the coupling relation between the network side converter and the direct current capacitor is equivalent to a second controlled current source which is connected in parallel with two ends of the direct current capacitor;
(3) calculating the control quantity of the first alternating current controlled voltage source according to the fact that the voltage value of the first alternating current controlled voltage source is the same as the alternating current voltage of the alternating current outlet when the machine side converter operates normally;
calculating the control quantity of the second alternating current controlled voltage source according to the fact that the voltage value of the second alternating current controlled voltage source is the same as the alternating current voltage of the alternating current outlet when the grid-side converter operates normally;
and respectively calculating the control quantity of the first controlled current source and the control quantity of the second controlled current source according to the fact that the voltage of the direct current capacitor and the active power of the system are kept unchanged.
The wind power plant double-fed fan converter simulation method has the advantages that the converter is equivalent to an alternating current controlled voltage source, the coupling relation between the converter and a direct current capacitor is equivalent to a controlled current source, and a wind power plant double-fed fan converter simulation model is established after the controlled voltage control quantity is calculated.
Further, in the device, according to the condition that the voltage value of each alternating current controlled voltage source is the same as the alternating current voltage of the alternating current outlet when the corresponding converter operates normally, a formula for calculating the control quantity of the first alternating current controlled voltage source and the control quantity of the second alternating current controlled voltage source is as follows:
wherein u issa、usb、uscAre respectively controlled by the first alternating currentControl quantity of voltage source A, B, C phase, utIs the voltage of the DC capacitor at time t, msa、msb、mscA, B, C-phase modulation waves are output by the machine side converter controller respectively; u. ofga、ugb、ugcRespectively, the control quantity m of the second AC controlled voltage source A, B, C phasega、mgb、mgcThe grid-side converter controllers respectively output A, B, C-phase modulation waves.
Further, in the device, according to the fact that the voltage of the direct current capacitor and the active power of the system are kept unchanged, a formula for calculating the control quantity of the first controlled current source and the control quantity of the second controlled current source is as follows:
wherein isdIs a controlled variable of the first controlled current source, vsa、vsb、vscInstantaneous values of phase voltages i of the A, B, C phases on the AC side of the machine-side convertersa、isb、iscInstantaneous values of the alternating current i of the A, B, C phases of the machine-side convertergdIs a controlled variable of the second controlled current source, vga、vgb、vgcInstantaneous values of phase voltages i of the ac side A, B, C phases of the grid-side converter ga、igb、igcRespectively, ac instantaneous values of the phases of the grid-side converter A, B, C.
Drawings
FIG. 1 is a schematic diagram of a voltage mode dual converter topology of a doubly-fed wind generator of the prior art;
FIG. 2 is a schematic diagram of an equivalent simulation model of the doubly-fed wind turbine converter of the present invention;
FIG. 3 is a schematic diagram of the AC measurement point configuration of the network side and machine side converters of the present invention;
in the figure, 1 is a first ac controlled voltage source, 2 is a second ac controlled voltage source, 3 is a first controlled current source, 4 is a second controlled current source, and 5 is a dc capacitor.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The method comprises the following steps:
the invention provides an equivalent simulation method of a wind power plant double-fed fan converter, which comprises the following steps:
(1) a machine side converter of the wind power plant is equivalent to a first alternating current controlled voltage source 1, and a grid side converter of the wind power plant is equivalent to a second alternating current controlled voltage source 2.
The grid-side converter is a converter at the side connected with a power grid, and the machine-side converter is a converter at the side of a fan. Because the wind farm grid-side converter and the machine-side converter are voltage source converters, power transmission is realized by means of voltage difference between two ends of the converter reactance, namely, the converter valve is controlled to output alternating-current voltage corresponding to target power at the alternating-current side, the converters can be equivalent to alternating-current controlled voltage sources (also called three-phase controlled voltage sources) shown in fig. 2, and the alternating-current voltage corresponding to each alternating-current controlled voltage source is controlled according to the output target power.
(2) The coupling relation between the machine side converter and the direct current capacitor 5 is equivalent to that the first controlled current source 3 is connected in parallel with two ends of the direct current capacitor 5, and the coupling relation between the network side converter and the direct current capacitor 5 is equivalent to that the second controlled current source 4 is connected in parallel with two ends of the direct current capacitor 5.
After the machine side converter and the grid side converter are equivalent to an alternating current controlled voltage source, the machine side converter and the grid side converter do not have a coupling relation any more, but in an actual system, the machine side converter and the grid side converter are coupled with each other through a direct current capacitor 5 to finish power transmission, meanwhile, because the power of the fan converter is transmitted in a single direction, the machine side converter flows through the direct current capacitor 5 and then is transmitted to the grid side converter, namely, the machine side converter charges the direct current capacitor 5, the grid side converter absorbs electric energy from the direct current capacitor 5, the direct current voltages of the direct current capacitor 5 and the direct current capacitor 5 are kept consistent, for the direct current capacitor 5, the machine side converter is equivalent to a current source, current flows to the positive electrode of the capacitor to charge the direct current capacitor 5, the grid side converter is also equivalent to a current source, but the current flows out from the positive electrode of the direct current capacitor to discharge the direct current capacitor 5, therefore, the coupling relation between the machine side converter and, the coupling relation between the grid-side converter and the direct current capacitor 5 is equivalent to that the second controlled current source 4 is connected in parallel to two ends of the direct current capacitor 5.
(3) Calculating the control quantity of the first alternating current controlled voltage source 1 according to the condition that the voltage value of the first alternating current controlled voltage source 1 is the same as the alternating current voltage of an alternating current outlet when the machine side converter operates normally;
calculating the control quantity of the second alternating current controlled voltage source 2 according to the fact that the voltage value of the second alternating current controlled voltage source 2 is the same as the alternating current voltage of the alternating current outlet when the grid-side converter operates normally;
and respectively calculating the control quantity of the first controlled current source 3 and the control quantity of the second controlled current source 4 according to the fact that the direct current capacitor voltage and the system active power are kept unchanged.
Because each converter and the corresponding alternating current controlled voltage source are in an equivalent relation, the voltage value of each alternating current controlled voltage source is completely the same as the alternating current voltage of the alternating current outlet when the corresponding converter normally operates, and the consistency of the external characteristics of the converters is ensured. According to the control principle of the converter, the phase of the modulation wave output by the converter controller is the same as that of the alternating-current voltage at the alternating-current outlet, but the amplitude is different, so that the control quantity of each alternating-current controlled voltage source can be calculated through the modulation wave, and other original controllers of the system are kept unchanged.
When the converter normally operates, the AC voltage at the outlet of the AC side and the modulation wave have the following relationship:
uac＝Udc·m
In the formula uacThe AC phase voltage, U, being the AC side outlet of the converterdcM is the voltage on the dc side of the converter, and m is the modulation wave, which is per unit value.
Therefore, the calculation formula of the control quantity of the first ac controlled voltage source 1 and the control quantity 2 of the second ac controlled voltage source in fig. 2 is as follows:
wherein u issa、usb、uscRespectively, a control quantity u of the first AC controlled voltage source A, B, C phasetIs the voltage of the DC capacitor at time t, msa、msb、mscA, B, C-phase modulation waves are output by the machine side converter controller respectively; u. ofga、ugb、ugcRespectively, the control quantity m of the second AC controlled voltage source A, B, C phasega、mgb、mgcThe output A, B, C-phase modulated waves of the grid-side converter controller are respectively shown in fig. 3, which is a schematic diagram of ac measurement points of the grid-side and machine-side converters.
The coupling relation of the machine side converter, the network side converter and the direct current capacitor is equivalent to two controlled current sources, and the voltage of the direct current capacitor is always utAnd no matter before and after the equivalence of the machine side converter or the grid side converter, the active power of the system is kept unchanged, so the control quantity of the first controlled current source 3 and the control quantity of the second controlled current source 4 can be calculated as the ratio of the power to the direct-current voltage, and the calculation formula is as follows:
Wherein isdIs a controlled variable of the first controlled current source, vsa、vsb、vscInstantaneous values of phase voltages i of the A, B, C phases on the AC side of the machine-side convertersa、isb、iscInstantaneous values of the alternating current i of the A, B, C phases of the machine-side convertergdIs a controlled variable of the second controlled current source, vga、vgb、vgcInstantaneous values of phase voltages i of the ac side A, B, C phases of the grid-side converterga、igb、igcRespectively, ac instantaneous values of the phases of the grid-side converter A, B, C.
Based on the method, the establishment of an equivalent simulation model of the wind power plant double-fed fan converter can be realized; the equivalent simulation method for the doubly-fed wind turbine converter of the wind power plant is simple and convenient to calculate during simulation, avoids a large amount of matrix operations caused by frequent change of the state of a switch model, and is applicable to simulation of a wind power plant system comprising a plurality of wind turbine generators.
The embodiment of the device is as follows:
the invention provides an equivalent simulation device of a wind power plant double-fed fan converter, which comprises a memory, a processor and a computer program which is stored in the memory and can run on the processor, wherein the equivalent simulation method of the wind power plant double-fed fan converter in the embodiment of the method is realized when the processor executes the program, and the specific process is not repeated.
The present invention has been described in relation to particular embodiments thereof, but the invention is not limited to the described embodiments. In the thought given by the present invention, the technical means in the above embodiments are changed, replaced, modified in a manner that is easily imaginable to those skilled in the art, and the functions are basically the same as the corresponding technical means in the present invention, and the purpose of the invention is basically the same, so that the technical scheme formed by fine tuning the above embodiments still falls into the protection scope of the present invention.
Claims (6)
1. An equivalent simulation method for a doubly-fed wind turbine converter of a wind power plant is characterized by comprising the following steps:
(1) the method comprises the steps that a machine side converter of a wind power plant is equivalent to a first alternating current controlled voltage source, and a grid side converter of the wind power plant is equivalent to a second alternating current controlled voltage source;
(2) the coupling relation between the machine side converter and the direct current capacitor is equivalent to a first controlled current source which is connected in parallel with two ends of the direct current capacitor, and the coupling relation between the network side converter and the direct current capacitor is equivalent to a second controlled current source which is connected in parallel with two ends of the direct current capacitor;
(3) calculating the control quantity of the first alternating current controlled voltage source according to the fact that the voltage value of the first alternating current controlled voltage source is the same as the alternating current voltage of the alternating current outlet when the machine side converter operates normally;
calculating the control quantity of the second alternating current controlled voltage source according to the fact that the voltage value of the second alternating current controlled voltage source is the same as the alternating current voltage of the alternating current outlet when the grid-side converter operates normally;
and respectively calculating the control quantity of the first controlled current source and the control quantity of the second controlled current source according to the fact that the voltage of the direct current capacitor and the active power of the system are kept unchanged.
2. The equivalent simulation method of the wind farm doubly-fed wind turbine converter according to claim 1, characterized in that a formula for calculating the control quantity of the first alternating controlled voltage source and the control quantity of the second alternating controlled voltage source is as follows according to the condition that the voltage value of each alternating controlled voltage source is the same as the alternating voltage of the alternating current outlet of the corresponding converter in normal operation:
Wherein u issa、usb、uscRespectively, a control quantity u of the first AC controlled voltage source A, B, C phasetIs the voltage of the DC capacitor at time t, msa、msb、mscA, B, C-phase modulation waves are output by the machine side converter controller respectively; u. ofga、ugb、ugcRespectively, the control quantity m of the second AC controlled voltage source A, B, C phasega、mgb、mgcThe grid-side converter controllers respectively output A, B, C-phase modulation waves.
3. The equivalent simulation method of the wind farm doubly-fed wind turbine converter according to claim 1, characterized in that a formula for calculating the control quantity of the first controlled current source and the control quantity of the second controlled current source according to the constant direct current capacitor voltage and the constant system active power is as follows:
wherein isdIs a controlled variable of the first controlled current source, vsa、vsb、vscInstantaneous values of phase voltages i of the A, B, C phases on the AC side of the machine-side convertersa、isb、iscInstantaneous values of the alternating current i of the A, B, C phases of the machine-side convertergdIs a controlled variable of the second controlled current source, vga、vgb、vgcInstantaneous values of phase voltages i of the ac side A, B, C phases of the grid-side converterga、igb、igcRespectively, ac instantaneous values of the phases of the grid-side converter A, B, C.
4. An equivalent simulation device for a doubly-fed wind turbine converter of a wind farm, comprising a memory, a processor and a computer program stored in the memory and operable on the processor, wherein the processor implements the following steps when executing the program:
(1) The method comprises the steps that a machine side converter of a wind power plant is equivalent to a first alternating current controlled voltage source, and a grid side converter of the wind power plant is equivalent to a second alternating current controlled voltage source;
(2) the coupling relation between the machine side converter and the direct current capacitor is equivalent to a first controlled current source which is connected in parallel with two ends of the direct current capacitor, and the coupling relation between the network side converter and the direct current capacitor is equivalent to a second controlled current source which is connected in parallel with two ends of the direct current capacitor;
(3) calculating the control quantity of the first alternating current controlled voltage source according to the fact that the voltage value of the first alternating current controlled voltage source is the same as the alternating current voltage of the alternating current outlet when the machine side converter operates normally;
calculating the control quantity of the second alternating current controlled voltage source according to the fact that the voltage value of the second alternating current controlled voltage source is the same as the alternating current voltage of the alternating current outlet when the grid-side converter operates normally;
and respectively calculating the control quantity of the first controlled current source and the control quantity of the second controlled current source according to the fact that the voltage of the direct current capacitor and the active power of the system are kept unchanged.
5. The equivalent simulation device of the wind farm doubly-fed wind turbine converter according to claim 4, wherein a formula for calculating the control quantity of the first AC controlled voltage source and the control quantity of the second AC controlled voltage source is as follows according to the fact that the control quantity of each AC controlled voltage source is the same as the AC voltage of the AC outlet when the corresponding converter operates normally:
Wherein u issa、usb、uscRespectively, a control quantity u of the first AC controlled voltage source A, B, C phasetIs the voltage of the DC capacitor at time t, msa、msb、mscA, B, C-phase modulation waves are output by the machine side converter controller respectively; u. ofga、ugb、ugcRespectively, the control quantity m of the second AC controlled voltage source A, B, C phasega、mgb、mgcThe grid-side converter controllers respectively output A, B, C-phase modulation waves.
6. The equivalent simulation device of the wind farm doubly-fed wind turbine converter according to claim 4, wherein a formula for calculating the control quantity of the first controlled current source and the control quantity of the second controlled current source according to the constant direct-current capacitor voltage and the constant active power of the system is as follows:
wherein isdIs a controlled variable of the first controlled current source, vsa、vsb、vscInstantaneous values of phase voltages i of the A, B, C phases on the AC side of the machine-side convertersa、isb、iscInstantaneous values of the alternating current i of the A, B, C phases of the machine-side convertergdIs a controlled variable of the second controlled current source, vga、vgb、vgcInstantaneous values of phase voltages i of the ac side A, B, C phases of the grid-side converterga、igb、igcRespectively, ac instantaneous values of the phases of the grid-side converter A, B, C.
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