Coordinated Control of Transient Voltage Support in Doubly Fed Induction Generators

Guanghu Xu, Jian Qiu, Jianxin Zhang, Huanhuan Yang, Qin Gao, Tuo Jiang and Yuan Wang ()
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Guanghu Xu: Power Dispatching Control Center, China Southern Power Grid, Guangzhou 510663, China
Jian Qiu: Power Dispatching Control Center, China Southern Power Grid, Guangzhou 510663, China
Jianxin Zhang: Power Dispatching Control Center, China Southern Power Grid, Guangzhou 510663, China
Huanhuan Yang: Power Dispatching Control Center, China Southern Power Grid, Guangzhou 510663, China
Qin Gao: Power Dispatching Control Center, China Southern Power Grid, Guangzhou 510663, China
Tuo Jiang: Power Dispatching Control Center, China Southern Power Grid, Guangzhou 510663, China
Yuan Wang: China Electric Power Engineering Consulting Group Southwest Electric Power Design Institute, Chengdu 610055, China

Energies, 2024, vol. 17, issue 19, 1-20

Abstract: The large-scale integration of wind power significantly alters the voltage dynamic characteristics of power systems. Wind turbines have a weak ability to withstand grid disturbances and have difficulty in providing effective reactive power support during transient periods. The sensitivity of wind turbines to the grid voltage significantly increases the probability of large-scale, cascading off-grid events. This paper proposes a coordinated control strategy to enhance the transient reactive power support capability of doubly fed wind farms. The additional stator current demagnetization control reduces the risk of a crowbar protection action after a fault and ensures that the unit power is controllable. Based on the voltage–reactive power coupling relationship, each unit can produce reactive power according to the voltage–reactive power sensitivity matrix during the transient period. After the reactive power output of the unit reaches the limit, transient active and reactive combined control is further adopted to reduce the active power output of the unit to a certain extent and improve the reactive power support capability. Finally, two cases are built in the PSCAD to verify the effectiveness of the proposed control strategy. The results show that the proposed control strategy can enable the wind farm to output more reactive power to the grid during the transient period, effectively supporting the system voltage during the transient process and avoiding further deterioration of the fault.

Keywords: doubly fed induction generator; wind farms; transient voltage support; coordinated control (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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