Comprehensive Voltage Control Strategy for New Energy Isolated Island System Aggregated by VSC-HVDC

Linlin Wu, Man Xu, Hui Liu, Jun Zhang
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引用次数: 1

Abstract

Nowadays the first four terminals VSC-HVDC grid project in the world is building in North China. Two sending isolated island systems are consist of millions of kilowatts renewable energy and single converter station. Their reactive power and voltage control faces challenge. Aiming at this, this paper proposes a comprehensive voltage control strategy for renewable energy isolated island system aggregated by VSC-HVDC. The control strategy includes steady state voltage control and emergency voltage modulation. For steady state voltage control, the voltage control is achieved through a multi-objective optimization strategy considering the network loss and the reactive power margin of the sending terminal VSC station. An improved genetic algorithm is used to solve the optimization problem. For emergency voltage modulation, reactive power and voltage droop modulation is applied to the sending terminal converter. Case study shows that the strategy takes into account the safety and economic operation of island system and maintains the reactive power of sending terminal VSC converter within the safe operation range as well.
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VSC-HVDC聚合的新能源孤岛系统综合电压控制策略
目前,世界上首批四大终端直流直流电网工程正在华北地区建设。两个发送孤岛系统由百万千瓦级可再生能源和单个换流站组成。它们的无功功率和电压控制面临挑战。针对此,本文提出了一种由vdc - hvdc聚合的可再生能源孤岛系统的综合电压控制策略。控制策略包括稳态电压控制和应急电压调制。对于稳态电压控制,通过考虑网络损耗和发送端VSC站无功裕度的多目标优化策略实现电压控制。采用改进的遗传算法求解优化问题。对于应急电压调制,发送端变换器采用无功和电压下垂调制。实例分析表明,该策略兼顾了孤岛系统的安全经济运行,使发端变频变流器无功功率保持在安全运行范围内。
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