摘要
针对动态电压恢复器(DVR)的快速和精确电压补偿问题,提出一种基于比例谐振控制的DVR双环反馈控制策略,电压外环将电容电压和指令输出电压比较,得到的电压偏差信号经过比例谐振控制器,控制器输出信号交给电流内环处理,而电流反馈内环采用简单比例控制以保证系统的快速性。将比例谐振控制器应用于DVR输出补偿电压控制策略中,可实现对指令补偿电压信号的无静差跟踪。在比例谐振控制器频率特性分析的基础上,详细分析离散域下引入控制延时的DVR反馈环控制系统。分析表明电流内环具有可靠的稳定性,作用于电压外环的比例谐振控制保证了系统的稳态精度,以及对负载电流的抗干扰能力,整个控制系统具有良好的动态和稳态性能。仿真结果验证了理论分析的正确性和所设计方法的有效性。
For the rapid and precise voltage compensation of DVR（Dynamic Voltage Restorer）,a double-loop feedback DVR control strategy based on proportional-resonant control is proposed： the outer voltage loop compares the capacitor voltage with the reference voltage,the voltage deviation is then processed by the proportional-resonant controller and transmitted to the inner current loop,which applies simple proportional control to ensure the rapidness.The proportional-resonant controller is used to track the reference voltage without static error.Based on frequency characteristic analysis of proportional-resonant controller,the feedback control system of DVR with control delay in discrete domain is analyzed,which shows that the inner current loop has reliable stability and the proportional-resonant control for the outer voltage loop ensures the steady-state system accuracy and a certain capability against load current interference.The whole system has excellent steady and dynamic performance.Simulative results verify the correctness of theoretical analysis and the effectiveness of designed method.
出处
《电力自动化设备》
EI
CSCD
北大核心
2010年第7期65-69,共5页
Electric Power Automation Equipment
关键词
动态电压恢复器
电压跌落
双环反馈控制
比例谐振控制
稳态精度
dynamic voltage restorer
voltage sag
double-loop feedback control
proportional-resonant control
steady-state accuracy
