Overvoltage Suppression Strategy of LCC-HVDC Delivery System Based on Hydropower Phase Control Participation

In a high-voltage direct current (HVDC) transmission system, commutation failure at the receiving end may lead to transient overvoltage at the sending end converter bus of the weak alterative current (AC) system. Firstly, the principle calculation method of overvoltage generation at the sending end...

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Published inElectronics (Basel) Vol. 13; no. 7; p. 1223
Main Authors Wu, Xiaorong, Cao, Bin, Shi, Huabo, Shi, Peng, Wang, Yuhong, Liao, Jianquan, Li, Yuanqi, Zeng, Weigang
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.04.2024
Subjects
Alternating current
Analysis
China
Clean technology
Commutation
Control systems
Data buses
Direct current
Electric power systems
Electric power transmission
Energy
Excitation
Failure
Hydroelectric power
Hydroelectric power stations
Hydrogen
Overvoltage
Phase control
Receiving
Wind farms
Wind power
China
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Summary:In a high-voltage direct current (HVDC) transmission system, commutation failure at the receiving end may lead to transient overvoltage at the sending end converter bus of the weak alterative current (AC) system. Firstly, the principle calculation method of overvoltage generation at the sending end after commutation failure is analyzed. Combined with the output characteristics of the hydroelectric excitation system, a coordinated control strategy for hydroelectric and DC systems is proposed. Since the voltage and current values at the DC outlet of the rectifier side change first after a fault occurs at the receiving end, the relationship equation between DC voltage and AC bus voltage is derived and it is used as an input signal to construct additional excitation control for hydropower stations. The proposed strategy is verified by establishing a simulation hydrogen–wind–solar model bundled via a DC sending system in PSCAD/EMTDC. The simulation results illustrate that the transient overvoltage suppression rates are all more than 35%, and the maximum is 38.53%. The proposed strategy can reduce the overvoltage by 0.126 p.u. compared with the International Council on Large Electric Systems (CIGRE) standard control strategy.
ISSN:2079-9292
2079-9292
DOI:10.3390/electronics13071223