Analysis on Influence Factors of Temporary Overvoltage of Load Rejection Fault of Offshore Wind Power Transmission System of Permanent Magnet Synchronous Generator

doi:10.12096/j.2096-4528.pgt.20033

Abstract

Abstract:

In order to evaluate the temporary overvoltage level of the wind power transmission system based on permanent magnet synchronous generator (PMSG) in case of load rejection, it is necessary to clarify the temporary overvoltage characteristics and its influencing factors after the fault. According to the mathematical analysis of the control and protection strategies of PMSG-based wind turbine, it was known that the DC bus rated voltage of the wind turbine, the modulation ratio of the grid side converter (GSC), the DC bus overvoltage protection setting, the wind turbine overvoltage protection setting and its action strategy were the main factors affecting the temporary overvoltage of the system. In addition, the type of reactive power compensation and configuration were also the factors influencing the temporary overvoltage of the system. PSCAD/EMTDC was used to verify the above factors. The results show that the relative control and protection strategies of PMSG-based wind turbine should be considered in wind turbine design and the calculation of the temporary overvoltage for wind farm.

Key words: offshore wind power, permanent magnet synchronous generator (PMSG), temporary overvoltage, control and protection strategy, reactive compensation

CLC Number:

TM 614

Daye YANG, Zutao XIANG, Xuzhi LUO, Ruihua SONG, Qiyu CHEN, Lin SHEN, Xiaotong WANG. Analysis on Influence Factors of Temporary Overvoltage of Load Rejection Fault of Offshore Wind Power Transmission System of Permanent Magnet Synchronous Generator[J]. Power Generation Technology, 2022, 43(1): 111-118.

Figures/Tables 13

Fig. 1 Schematic diagram of PMSG

Fig. 2 GSC control diagram of wind turbine

Fig. 3 Line-to-line voltage U at the terminal of wind turbine

Fig. 4 Line voltage Uab at the terminal of wind turbine

Fig. 5 Test voltage of high voltage ride through of wind turbine

Fig. 6 Schematic diagram of offshore wind farm

Fig. 7 Typical waveform of three-phase voltage in case of no fault load rejection at grid side of cable line

Tab. 1 Temporary overvoltage considering different values of DC bus voltage

直流母线电压/pu	暂时过电压最大值/pu
直流母线电压/pu	风电场侧	系统侧
1.00	1.20	1.22
1.02	1.22	1.24
1.04	1.25	1.28

Tab. 2 Temporary overvoltage considering different magnitude limits of modulation wave

调制波限幅	暂时过电压最大值/pu
调制波限幅	风电场侧	系统侧
1.20	1.21	1.23
1.15	1.20	1.22
1.10	1.17	1.17

Tab. 3 Temporary overvoltage considering different activated values of chopper circuit

chopper电路动作电压/pu	暂时过电压最大值/pu
chopper电路动作电压/pu	风电场侧	系统侧
1.10	1.20	1.22
1.08	1.18	1.20
1.05	1.15	1.17

Tab. 4 Temporary overvoltage considering different delays of overvoltage protection

1.3pu过电压保护动作延时/ms	暂时过电压最大值/pu
1.3pu过电压保护动作延时/ms	风电场侧	系统侧
0	1.20	1.22
5.0	1.27	1.28
10.0	1.50	1.56

Tab. 5 Temporary overvoltage considering different action time of grid connected breaker

并网断路器动作时间/ms	暂时过电压最大值/pu
并网断路器动作时间/ms	风电场侧	系统侧
50.0	1.20	1.22
80.0	1.20	1.22
100.0	1.20	1.22

Tab. 6 Temporary overvoltage considering different types of reactive power compensation device

无功补偿装置类型	暂时过电压最大值/pu
无功补偿装置类型	风电场侧	系统侧
50%FC+ 50%STATCOM	1.19	1.22
100%STATCOM	1.18	1.22

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