考虑 MAF 延时和前馈补偿的高压直流快速锁相环

作者：Wang Juanjuan; Yu Zhenxiao; Wu Qiumei; Fu Chuang^*

来源：Proceedings of the CSEE, 2024, 44(2): 535-546.

DOI：10.13334/j.0258-8013.pcsee.222242

• commutation failure
• feedforward compensation
• high voltage direct current (HVDC)
• phase-locked loop (PLL)
• the delay of filter

Synchronous reference frame phase-locked loop (SRF-PLL) is a narrow-bandwidth PLL widely used in high voltage direct current (HVDC) synchronous firing control systems, whose dynamic response is slow in the case of phase jumps caused by AC system faults. In order to increase the bandwidth of PLL, a moving average filter (MAF) is placed in front of PLL. However, there is a response delay in MAF, which restricts the synchronous speed of PLL. In order to alleviate the problem of response delay, this paper proposes an HVDC fast PLL considering MAF delay and feedforward compensation. First, the linear transient characteristic of MAF is used to predict the phase change, and different compensation strategies are proposed for the phase jump caused by fault being connected and removed, respectively. Then, the invariance principle is used to perform feedforward compensation on PLL. Under the action of the composite correction control system composed of negative feedback control and feedforward compensation, PLL can achieve fast response with small PI parameters. Finally, the proposed fast PLL is simulated and verified in the CIGRE HVDC benchmark model and the Three Gorges-Shanghai DC project model. The results show that the fast PLL can effectively alleviate the restriction of the filter response delay, shorten the loss-of-lock time, and further improve the ability of the HVDC inverter side to resist commutation failure. ?2024 Chin.Soc.for Elec.Eng.

• 出版日期2024
• 单位华南理工大学; 南方电网科学研究院有限责任公司