摘要
基于三角载波固定开关频率PWM电流控制方法及单极性载波移相SPWM(CPS-SPWM)开关调制策略,通过在电流控制通道上引入电网电压前馈,提出一种应用在级联H桥型配电网静止同步补偿器(DSTATCOM)中的固定开关频率PWM电流解耦控制策略,并建立了该电流控制策略下级联H桥型DSTATCOM的数学模型。理论分析和实验表明,当电网电压三相不平衡时,采用该电流解耦控制策略能消除电网电压对电流控制的扰动,装置三相电流跟踪控制相互独立;电流跟踪控制误差明显减小,从而有效提高了电流跟踪控制的精度。
Based on the triangular carrier wave fixed switching frequency PWM current control method and the CPS-SPWM switch technology,by mean of inserting a voltage feed-forward control in the current control channel,a three-phase currents decoupled control strategy for cascaded H-bridge distribution static compensator（DSTATCOM） is pro-posed.Meanwhile,the mathematical model of cascaded H-bridge DSTATCOM based on this method is built.Via the theory analysis and experiments,it shows the decoupled control method can eliminate the voltage disturbances from the power system to the three-phase currents control,and reduce the currents tracing errors,and when the voltage im-balance failure in power system happens,the three-phase currents control is still independent with each other.
出处
《电力电子技术》
CSCD
北大核心
2010年第12期88-90,共3页
Power Electronics
基金
江苏省电力公司重点科技项目(J2008057)~~
关键词
配电网静止同步补偿器
电流解耦控制
固定开关频率
三相不平衡
distribution static compensator
current decoupled control
fixed switching frequency
three-phase imbalance
