基于附加信号的VSC-HVDC系统改进有功功率控制策略  

Advanced active power control strategy based on additional signal for VSC-HVDC transmission system

作　　者：任敬国[1] 李可军[1] 牛林 赵建国[1,2] 于大洋[1] 任敬刚 梁永亮[1] 

机构地区：[1]山东大学电气工程学院,山东济南250061 [2]国网技术学院,山东济南250002 [3]东营供电公司,山东东营257091

出　　处：《电力自动化设备》2013年第7期46-51,共6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;2012GQX20115;sf003)~~

摘　　要：为了保证大扰动情况下电压源换流器型高压直流输电(VSC-HVDC)系统的直流电压控制和有功功率平衡,提出了一种基于附加信号的有功功率控制策略。首先简要地分析了故障情况下VSC-HVDC系统的有功功率平衡和直流电压变化特点;然后给出了改进有功功率控制器的功率特性曲线,推导了定有功功率控制端直流电压最大工作范围的计算公式;接着提出了外环有功功率控制器的设计方法,推导了有功功率修正值的计算公式,并分析了该控制器在正常运行和故障2种情况下的工作原理。PSCAD/EMTDC仿真研究表明,在电网电压跌落或主导换流站停运等暂态扰动情况下,所提控制策略能够维持直流电压在安全运行范围内。An advanced active power control strategy based on additional signal is proposed,which guarantees the DC voltage control and achieves active power balance during the big disturbance in VSC-HVDC transmission system. The variation characteristics of DC voltage and active power under fault situations are briefly analyzed,the power characteristic curve of advanced controller is given and the computational formula for the maximal working range of DC voltage at the constant active power control end is derived. The design of outer-loop active power controller is introduced ,the computational formula of active power correction is derived and the operating principle of the controller is analyzed for normal and faulty operating conditions of VSC-HVDC system. Simulative study with PSCAD/EMTDC verifies that,the proposed control strategy maintains the DC voltage within the range of safe operation during the transient disturbances of grid voltage sag or leading inversion station breakdown.

关 键 词：电压源型换流器 高压直流输电 柔性直流输电 功率控制 电压控制 

分 类 号：TM721.1[电气工程—电力系统及自动化] TM761