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| Study on Equivalence Method of AC System in Sending-End of LCC-HVDC |
| Gao Benfeng1, Wang Gang1, Liu Yi1, Liu Xinyuan1,2, Hu Yongqiang1, Hao Yuqian1 |
1. Hebei Key Laboratory of Distributed Energy Storage and Micro-grid North China Electric Power University Baoding 071003 China;
2. State Grid Shanxi Electric Power Research Institute Taiyuan 030001 China |
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Abstract When the sending-end of line-commutated-converter based high voltage direct current (LCC-HVDC) contains large-scale new energy, the risk of overvoltage on the sending-end will aggravate. It is necessary to establish the electromagnetic transient model of LCC-HVDC and its equivalent AC system in sending-end. Then the control strategy of LCC-HVDC can be optimized by analyzing its overvoltage characteristics. At present, there are few researches on the equivalence of AC system in sending-end. According to the engineering requirements, an equivalent scheme suitable for LCC-HVDC is proposed. First, the residual voltage of each node in the main network can reflect the coupling between LCC-HVDC and the sending-end. A method for determining the internal system backbone network based on the residual voltage is proposed. The method can quickly determine the scope of the internal system and effectively avoid the human error during the equivalence. Then, based on the node of backbone network, the topology area is divided, and the detailed parameter determination method of equivalent sources, loads and transformers in the internal system are given based on the principle of consistent electrical characteristics of each topology area before and after equivalence. Finally, the multi-port thevenin equivalent suitable for the sending-end of LCC-HVDC is used to simplify the external system. Based on a domestic LCC-HVDC, the effectiveness of the proposed equivalent scheme is verified.
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Received: 09 October 2020
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2021, Vol. 36 
