文章摘要
陶艳,刘天琪,李保宏,等.高压柔性直流电网分层协同自适应下垂控制[J].电力系统自动化,2018,42(18):70-76. DOI: 10.7500/AEPS20180105001.
TAO Yan,LIU Tianqi,LI Baohong, et al.Hierarchical Coordinated Adaptive Droop Control in Flexible HVDC Grid[J].Automation of Electric Power Systems,2018,42(18):70-76. DOI: 10.7500/AEPS20180105001.
高压柔性直流电网分层协同自适应下垂控制
Hierarchical Coordinated Adaptive Droop Control in Flexible HVDC Grid
DOI:10.7500/AEPS20180105001
关键词: 直流电网  分层协同控制  最优潮流  功率裕度  电压偏差  自适应下垂控制
KeyWords: DC grid  hierarchical coordinated control  optimal power flow  power margin  voltage deviation  adaptive droop control
上网日期:2018-08-14
基金项目:国家重点研发计划资助项目(2016YFB0900901)
作者单位E-mail
陶艳 四川大学电气信息学院, 四川省成都市 610065  
刘天琪 四川大学电气信息学院, 四川省成都市 610065 tqliu@scu.edu.cn 
李保宏 四川大学电气信息学院, 四川省成都市 610065  
苗丹 四川大学电气信息学院, 四川省成都市 610065  
董语晴 四川大学电气信息学院, 四川省成都市 610065  
卢智雪 四川大学电气信息学院, 四川省成都市 610065  
摘要:
      为实现直流电网的潮流优化及扰动后不平衡功率的合理分配,提出一种直流电网分层协同自适应下垂控制策略。其中,系统控制层基于各站直流电压、有功功率等信息,以直流电网运行中网损和直流电压偏差最小为优化目标,实时分析并优化各站的直流电压、有功功率指令,以实现稳态时直流电网潮流最优;换流站控制层以本地信号为依据,综合考虑各换流站功率裕度以及电压偏差影响,通过实时自适应调整下垂系数,合理分配扰动后直流电网内部的不平衡功率,同时减小直流电压的偏差。系统控制层的指令值优化与换流站控制层的下垂系数优化协同作用,实现直流电网功率的协调控制。以七端直流电网为例的仿真结果验证了所提策略的有效性和优越性。
Abstract:
      In order to optimize the power flow of the high voltage direct current(HVDC)grid and reasonably distribute the unbalanced power after disturbance, this paper proposes a hierarchical coordinated adaptive droop control strategy in flexible DC grid. Based on the DC voltage and active power of converter stations, the system-level control layer takes minimum network loss and DC voltage deviation of DC grid as the optimization object. Then the references of DC voltage and active power are analyzed and optimized in real time, so that the DC power flow optimization can be achieved in steady state. The optimization of converter-level control layer is based on the local signals. Considering the power margin of converters and the voltage deviation factor, the droop coefficient is adjusted in real time to realize the reasonable distribution of unbalanced power in the DC grid after disturbance and reduce the deviation of DC voltage. The optimization of reference values on system-level control layer is coordinated with the optimization of droop coefficient on converter-level control layer, so the coordination control of power is realized. The simulation results of seven-terminal DC grid verify the effectiveness and superiority of the proposed strategy.
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