基于最优功率分配的多端直流网络改进下垂控制策略

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Abstract Due to various distances of transmission lines as well as higher resistance for the voltage source converter multi-terminal direct current (VSC-MTDC)system,the copper loss for the whole system,especially the long distance and large capacity high voltage direct current (HVDC) system,is larger.In order to realize the coordinated control between different stations achieving the minimum copper loss for the HVDC system,the calculation method of the voltage droop coefficient for the VSC-MTDC system without/with local load is built,and a DC voltage droop control strategy is proposed.By introducing the remaining capacity space,each converter station can participate in the power compensation according to its remaining capacity.The PSCAD/EMTDC is used to build the detailed models of the VSC-MTDC system.The simulation verifies operating characteristics in normal/fault conditions.Simulation results show that the proposed control can reduce the copper loss effectively,restrain the DC power oscillation caused by AC fault,and realize the emergency power support.

Key words： Improved droop control minimum copper loss voltage source converter multi-terminal direct current optimal power allocation remaining capacity

Received: 13 April 2015 Published: 07 July 2016

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TM72

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	Ran Xiaohong
	Miao Shihong
	Wu Yingjie
	Qian Tiantian

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Ran Xiaohong,Miao Shihong,Wu Yingjie等. An Improved Droop Control Strategy for Multi-Terminal DC Grids Based on Optimal Active Power Allocation[J]. Transactions of China Electrotechnical Society, 2016, 31(9): 16-24.

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https://dgjsxb.ces-transaction.com/EN/ OR https://dgjsxb.ces-transaction.com/EN/Y2016/V31/I9/16

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