基于N-1准则的VSC-MTDC输电系统稳态调控方案  

N-1 principle based steady-state control of VSC-MTDC transmission system

作　　者：任敬国[1] 李可军[1] 赵建国[1,2] 牛林[2] 梁永亮[1] 郭启伟[1] 

机构地区：[1]山东大学电气工程学院,山东济南250061 [2]国家电网技术学院,山东济南250002

出　　处：《电力自动化设备》2013年第2期74-80,共7页Electric Power Automation Equipment

基　　金：山东省自然科学基金资助项目(ZR2010EM033);山东省科技发展计划项目(2011GGX10405);山东大学自主创新基金资助项目(2012TS211);山东省科技发展计划项目(2012-GQX20115;sf003)~~

摘　　要：分析了电压源换流器型多端直流输电(VSC-MTDC)系统的安全稳定运行条件,给出了VSC-MTDC系统的控制系统分层结构和直流潮流计算方法。提出了一种基于N-1准则的多端直流输电系统稳态运行调控方案;基于连续潮流计算和换流站的电压、功率限制,设计了应对主导站和非主导站停运的调控策略,给出了直流输电系统指令值的计算步骤,并讨论了解的存在性问题。提出了换流站停运调控策略无解情况下有功功率指令值的优化方法,定义了优化后有功功率指令值的评价指标以用于寻找最优解。以典型的五端直流输电系统为例,利用MATLAB编程验证该调控方案的可行性与准确性。计算结果表明,该调控方案能够为VSC-MTDC系统提供可靠安全的指令值。The requirements for maintaining VSC-MTDC transmission system safe and stable are analyzed, and the hierarchical structure of control system and the calculation of DC power flow are outlined. An N-1 principle based control strategy is proposed for the steady-state operation of MTDC transmission system. Based on the continuous DC power flow calculation and the DC voltage and power limits,the control strategy coping with the single converter loss is designed,the specified steps of reference value calculation is presented and the existence of solution is discussed. When there is no solution,the way to optimize the active power reference is proposed and an evaluation index is defined for searching the optimal active power references after optimization. A typical five-terminal DC system is introduced and MATLAB programming is applied to verify the feasibility and accuracy of the proposed strategy. Results show that the proposed control strategy provides VSC-MTDC transmission system with reliable and safe references.

关 键 词：直流输电 电压源换流器型直流输电 多端直流输电 N-1准则 稳态调控 

分 类 号：TM721.1[电气工程—电力系统及自动化] TM761