Low/high-voltage through optimization control method for doubly-fed wind power generation system

A technology of doubly-fed wind power generation and wind power generation system, applied in wind power generation, AC network voltage adjustment, reactive power compensation, etc., can solve problems such as not being effectively utilized, improve low/high voltage ride-through capability, and optimize control strategy , Increase the effect of reactive power output ability

Inactive Publication Date: 2014-02-26
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under normal circumstances, the reactive power control objective of the double-fed wind power generation system is mainly to ensure that the generator system operates at unity power factor, so the reactive power control has not been effectively utilized.

Method used

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  • Low/high-voltage through optimization control method for doubly-fed wind power generation system
  • Low/high-voltage through optimization control method for doubly-fed wind power generation system
  • Low/high-voltage through optimization control method for doubly-fed wind power generation system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] figure 1 It is a flowchart of an optimal control method for low / high voltage ride-through of a doubly-fed wind power generation system provided by the present invention, such as figure 1 As shown, the optimal control method for low / high voltage ride-through of double-fed wind power generation system includes:

[0037] Step 1: Determine the upper and lower limits of the reactive current of the DFIG grid-side converter.

[0038] Under normal circumstances, the reactive power control goal of the doubly-fed wind power generation system is mainly to ensure that the generator system operates at unity power factor. Power control has not been effectively utilized. The reactive power control can effectively suppress the voltage drop or rise, which is equivalent to reducing the severity of the fault and making it easier to realize low-voltage ride-through or high-voltage ride-through.

[0039] The cooperation of the generator, the grid-side converter and the capacitor of the d...

Embodiment 2

[0064] The effect of reactive power control on low voltage ride-through capability of double-fed system is simulated in power system real-time digital simulator RTDS.

[0065] The simulation in this part is based on the RTDS simulation model, using Figure 4 The control structure shown, gets as Figure 5-8 The waveform shown. Among them, the meanings of the parameters in the waveform diagram are as follows: VSYS1A, VSYS1B, and VSYS1C are the three-phase voltages of the stator; IROTA1, IROTB1, and IROTC1 are the three-phase currents of the rotor; VCAP is the DC bus voltage.

[0066] Figure 5 ~ Figure 8 The simulation waveforms of the stator voltage, rotor current and DC bus voltage when the wind speed is 12m / s, 12m / s, 10m / s and 8m / s respectively, the fault setting is that the voltage drops to 0.2pu, and the duration is 625ms, and the simulation conditions are set And statistics are shown in Table 1.

[0067] Compared Figure 5 and Figure 6 as well as Figure 9 It can b...

Embodiment 3

[0070] The effect of reactive power control on the high voltage ride-through capability of double-fed system is simulated in the power system real-time digital simulator RTDS.

[0071] This embodiment effectively improves the high-voltage ride-through capability of the wind turbine by controlling the wind turbine to absorb inductive reactive power and reduce the stator voltage when the voltage rises.

[0072] use Figure 4 The control structure shown controls it to absorb reactive power during a fault. The fault judgment signal at this time is a voltage rise. When the voltage exceeds 1.1 times the rated voltage, the q-axis current value switches to the voltage support mode. The simulation is set to The voltage rises to 1.3pu, and the rotor crowbar circuit operates during the fault, resulting in Figure 10 The simulated waveform is shown.

[0073] Depend on Figure 10 It can be seen from the simulation results that the DC bus voltage can be effectively limited to a safe valu...

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Abstract

The invention discloses a low/high-voltage through optimization control method for a doubly-fed wind power generation system in the technical field of control over wind power generation systems. The method comprises the following steps of determining an upper limit and a lower limit of reactive current of a grid-side converter of a doubly-fed wind-driven power generator; judging whether a power grid fails or not, and if the power grid does not fail, setting the q-axis current of the grid-side converter of the doubly-fed wind-driven power generator to be zero; if a voltage-drop failure occurs in the power grid, injecting inductive reactive current or capacitive reactive current to the power grid through the low-voltage side of a transformer of the generator within a set time after the failure of the power grid is identified. According to the method, a control strategy for the grid-side converter can be optimized, and the reactive power output capability of the grid-side converter during the failure is improved, so that the low/high-voltage through capability of the doubly-fed wind power generation system is improved.

Description

technical field [0001] The invention belongs to the technical field of wind power generation system control, and in particular relates to an optimal control method for low / high voltage ride-through of a doubly-fed wind power generation system. Background technique [0002] With the expansion of wind power grid-connected scale, the wind power grid-connected guidelines of many countries put forward low-voltage ride-through and high-voltage ride-through requirements for grid-connected wind farms, so that the wind farms will not run off the grid when the grid fails, and provide active power and Reactive power support, in order to facilitate the safe and stable operation of the power grid in case of failure. [0003] For wind farms using double-fed generators, the reactive power emitted or absorbed by the wind farm is controlled by the dispatcher to ensure the quality of power output by the wind farm and improve the impact of the wind farm on the grid. In view of the fact that t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/16
CPCY02E10/763Y02E40/34Y02E10/76Y02E40/30
Inventor 薛安成霍建东章沈泉毕天姝张健
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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