电力建设2017，Vol.38Issue(11)：19-25,7.DOI:10.3969/j.issn.1000-7229.2017.11.003
基于N-1规则的多端柔性直流输电系统联合控制策略
Coordinated Control Strategy for VSC-MTDC Systems Based on N-1 Criterion
摘要
Abstract
The operation of voltage sourced converter based on the multi-terminal high voltage direct current ( VSC-MTDC) transmission system is required to meet the minimum N-1 criterion. Specifically, when one converter is out of operation due to fault or maintenance, the surviving converters have the ability to regulate power, so as to restore the balance of power and maintain the transient overvoltage without exceeding the equipment insulation margin. In order to keep the DC voltage stability of VSC-MTDC as much as possible, this paper proposes a coordinated control strategy when any converter station in VSC-MTDC is out of operation. This strategy combines the advantages of master-slave control and droop control of VSC-MTDC system. The converter owing the largest capacity is controlled with a constant DC voltage while other converters are controlled by a DC voltage-active power droop controller. Besides, the converter with constant DC voltage has a higher priority to regulate active power than other converters, and other converters start to regulate active power only when the power of the converter with constant DC voltage reaches the upper limit. Finally, the VSC-MTDC model is developed in PSCAD/EMTDC and the proposed control strategy is verified. The results show that the proposed control strategy can effectively guarantee the stability of DC voltage and the emergency transmission of power when converter station is out of operation, which improves the operation stability of VSC-MTDC.关键词
多端柔性直流输电/N-1/直流电压/联合控制Key words
VSC-MTDC/N-1/DC voltage/coordinated control分类
信息技术与安全科学引用本文复制引用
赵晓斌,邵冰冰,韩民晓..基于N-1规则的多端柔性直流输电系统联合控制策略[J].电力建设,2017,38(11):19-25,7.基金项目
南方电网重点科技项目(CSGTRC-K153030) （CSGTRC-K153030）
