Research on Transient AC Overvoltage Suppression Strategy of Islanded Wind Power Transmission via VSC-HVDC

doi:10.12096/j.2096-4528.pgt.21023

Abstract

Abstract:

Voltage source converter based high voltage direct current (VSC-HVDC) has a broad application prospect in the field of islanded renewable energy transmission, due to its advantages such as no commutation failure. When AC fault occurs in the AC power grid at the sending end of the islanded wind power transmission via VSC-HVDC, AC transient overvoltage occurs after fault clearance, endangering the safety of wind turbine and VSC-HVDC equipment. Taking the doubly fed induction generator (DFIG) as an example, this paper focused on the VSC-HVDC based on modular multilevel converter (MMC), and carried out a research on the strategy of suppressing AC transient overvoltage for MMC. Firstly, this paper analyzed the mathematical model of MMC and DFIG, and pointed out that the transient overvoltage was caused by the reactive power provided by MMC and DFIG. On this basis, combined with MMC control system model, a transient overvoltage auxiliary suppression strategy was proposed to reduce the reactive power output according to the AC voltage recovery. Finally, the effectiveness of the proposed strategy was verified by simulations on PSCAD using the Zhangbei MMC-HVDC project model.

Key words: renewable energy, carbon peak, carbon neutrality, voltage source converter based high voltage direct current (VSC-HVDC), islanded transmission, transient overvoltage, suppression strategy

CLC Number:

TK 89

Xiao YU, Guangquan BU, Shanshan WANG. Research on Transient AC Overvoltage Suppression Strategy of Islanded Wind Power Transmission via VSC-HVDC[J]. Power Generation Technology, 2022, 43(4): 618-625.

Figures/Tables 13

Fig. 1 Basic topological structure of wind power transmission system via MMC

Fig. 2 Diagram of double loop VF control for MMC

Fig. 3 Low voltage ride through requirements of wind farm

Fig. 4 Topological structure of DFIG connected to AC grid

Fig. 5 Auxiliary control strategy of transient overvoltage

Fig. 6 Topological structure of Zhangbei VSC-HVDC

Tab. 1 Main circuit parameters of MMC

场站	额定容量/MW	交流侧额定电压/kV	桥臂电感/mH	子模块电容/mF	子模块电平数
STA1	2×1 500	525	50	7.0	100
STA2	2×750	525	100	3.8	100
STA3	2×750	230	100	3.8	100
STA4	2×1 500	230	50	7.0	100

Fig. 7 AC voltage of Zhangbei station

Fig. 8 Reactive power output of Zhangbei station

Fig. 9 AC voltage of Zhangbei station in two-phase grounding short circuit

Fig. 10 Variation relationship between upper limit of exit strategy voltage Ush and PCC voltage

Fig. 11 Variation relationship between lower limit of effective strategy voltage Usl and PCC voltage

Fig. 12 Variation relationship between effective strategy voltage reference usrefl and PCC voltage

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