李景一;毕天姝;张鹏;

• 1:新能源电力系统国家重点实验室(华北电力大学)

摘要(Abstract)：

永磁直驱风电场发生次同步振荡时,由于风机变流控制系统对馈入的次同步频率分量的响应作用,会产生多个次/超同步频率电压,幅值过高时甚至影响风场的电能质量及动态无功补偿装置等的正常运行。采用两输入两输出(TITO)闭环传递函数方法揭示了直驱风电场次/超同步频率电压的产生机理及其解析计算方法。首先,针对永磁直驱风机并网系统,推导其两输入两输出闭环传递函数。在此基础上,分析变流控制系统参数及交流系统参数对响应特性的影响,并与采用单输入单输出闭环传递函数及开环传递函数所得分析结果对比,结果表明TITO闭环传递函数更准确地体现变流控制系统次同步频率分量响应特性,计算电压幅值更准确。最后采用时域仿真方法验证了次/超同步频率电压的存在以及参数变化对电压幅值的影响。

关键词(KeyWords)： 并网永磁直驱风机;变流控制系统;次同步振荡;响应特性;传递函数

Abstract:

Keywords:

基金项目(Foundation): 国家重点研发计划项目(2017YFB0902004);; 国家自然科学基金资助项目(51627811);; 高等学校学科创新引智计划资助(B08013)~~

作者(Author): 李景一;毕天姝;张鹏;

Email:

DOI: 10.13335/j.1000-3673.pst.2017.2952

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