AC fault ride through control strategy on inverter side of hybrid HVDC transmission systems

• DOI: 10.1007/s40565-019-0546-1
• Publication Date: 2019-07-26T04:41:59Z
• Authors: Zexin ZHOU; Zhengguang CHEN; Xingguo WANG; Dingxiang DU; Guosheng YANG; Yizhen WANG; Liangliang HAO
• Keywords: TK1001-1841; Production of electric energy or power. Powerplants. Central stations; Fault crossing; Inverter side; 0202 electrical engineering, electronic engineering, information engineering; TJ807-830; 02 engineering and technology; 7. Clean energy; Renewable energy sources; Hybrid HVDC transmission; Control strategy

Hybrid high-voltage direct current (HVDC) transmission systems employ a new type of HVDC transmission topology that combines the advantages of the line-commutated converter system and the voltage-source converter system. They can improve the efficiency and reliability of long-distance power transmission. However, realizing alternating-current (AC) grid-fault ride through on the inverter side of a hybrid HVDC transmission system is a challenge considering that a voltage-source converter based HVDC (VSC-HVDC) is used on the inverter side. In this study, a control strategy for an overvoltage fixed trigger angle based on the power-balance method is developed by fully utilizing the operation characteristics of a hybrid HVDC transmission system. The strategy reduces the inverter-side overvoltage of the HVDC system under a fault in the inverter-side AC system. Simulations based on Gezhou Dam are conducted to validate the effectiveness of the proposed strategy.