双馈风电场故障穿越控制策略对风火打捆系统暂态稳定性影响及提升控制策略研究

doi:10.19595/j.cnki.1000-6753.tces.240174

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Abstract

The "wind-fire bundled" system enhances wind power stability and transmission channel efficiency, crucial for long-distance large-scale wind power distribution. However, the system's extensive transmission range complicates the dynamic interaction between wind and thermal power, leading to transient stability challenges. Previous studies on wind turbine Low Voltage Ride Through (LVRT) lacked a solid theoretical foundation, offering limited insights based on specific system states. Representing the wind turbine during fault ride-through as an impedance model fails to accurately capture its impact on system transient stability. This paper delves into an in-depth analysis of doubly-fed wind farm fault ride-through control strategies within the wind-fire bundling system, utilizing an extension of the Equal Area Rule to assess the effects of reactive and active current outputs during fault periods on system stability dynamics.
Firstly, the doubly-fed wind turbine is equivalent to a current source model, and the extended equal-area rule is applied to construct an equivalent single-machine infinity model of the wind-fire bundling system. On this basis, firstly, based on the principle of reactive power priority, it is assumed that the wind turbine only emits reactive power during the fault period and does not emit active power, so as to analyze the influence of the wind turbine's emitting reactive current on the amplitude of electromagnetic power of synchronous machine during the fault period, and then based on the equal-area rule, analyze the influence on the transient accelerating area of the system. When analyzing the effect of active current issued by the fan on the system, it is assumed that the reactive current issued by the fan is a constant value under a certain fault, and the same analysis method is used to discuss the change rule of active current on the suspension stability of the system. Finally, a control strategy to improve the transient power angle stability is proposed based on the obtained conclusions.
Simulation results indicate that there are two patterns of change in the influence of reactive current issued by the fan on the transient stability of the system during the fault period, and there are three cases of the influence of active current issued by the fan on the transient stability of the system. The transient stability of the synchronous machine is significantly improved by the control strategy proposed in this paper.
The following conclusions can be drawn from the simulation analysis: (1) The theoretical analysis shows that a larger reactive power ratio coefficient of the fan during the fault period can effectively reduce the transient acceleration area of the synchronous machine, which is more conducive to the transient stabilization of the wind-fire bundling system, and the electromagnetic transient simulation results also verify that the theoretical analysis is correct. The electromagnetic transient simulation results also verify the correctness of the theoretical analysis.(2) Under the premise of guaranteeing the reactive power priority, the influence of the remaining capacity of the wind turbine in the form of active current on the transient stability of the wind-fire baling system during the fault period does not show a single law, but varies with the change of the system parameters, and the simulation results verify the correctness of the different influence laws.(3) According to the influence mechanism of active/reactive current on transient stability, the influence factors of transient stability are divided into four quadrants and analyzed separately, and the theoretical analysis shows that in quadrant 2, under the premise of certain reactive power ratio coefficient, it is more conducive to the transient stability to set the maximum value of the active current; in quadrant 3, it is relevant to set the magnitude of active current and active power ratio coefficient. Quadrant I and IV are more favorable for transient stabilization by changing the system parameters so that their action intervals are changed to the second and third quadrants, and then controlled according to the control strategies in quadrant II and III.

Key words： Wind and fire bundling current sources reactive power proportionality factor extended equal area rule

Received: 26 January 2024

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TM614

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	Zhang Feng
	Chen Wuhui
	Kang Jiale
	Yu Hao

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Zhang Feng,Chen Wuhui,Kang Jiale等. Research on the effect of fault ride-through control strategy of doubly-fed wind farms on transient stability of wind-fire bundling system and enhancement control strategy[J]. Transactions of China Electrotechnical Society, 0, (): 240174-240174.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.240174 OR https://dgjsxb.ces-transaction.com/EN/Y0/V/I/240174

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