摘要
针对三相并网逆变器直流分量传统抑制方法补偿精度低、动态响应特性差的问题,提出一种基于模糊迭代PI控制的直流分量抑制策略。由于并网逆变器输出电压直流分量并不是恒定不变的常量,该策略采用改进滑动平均滤波以工频周期为单位测取输出电流的直流分量;利用模糊迭代PI控制的周期积分特性进行精确计算,将计算结果作为反馈补偿SVPWM脉宽,实现直流分量的抑制。实验结果表明,对比传统抑制方法该策略补偿精度高,动态响应快。
In order to deal with the problems of the poor dynamic response and low compensation accuracy of the traditional strategy for suppressing DC bias,a suppression method based on fuzzy iteration proportional-integral（ PI）control is proposed. The DC component in the output of three-phase grid-connected inverters is not a constant.Therefore,the improved slip average filter is chosen to detect the DC component,and then the SVPWM pulse width is compensated with the cycle calculation by a fuzzy iteration PI controller,which achieves the restrain of DC rejection.Finally,the experiments prove that the proposed strategy can increase the compensation accuracy and improve the dynamic response compared with the traditional methods.
出处
《江南大学学报（自然科学版）》
CAS
2015年第5期585-589,共5页
Joural of Jiangnan University (Natural Science Edition)
基金
江苏省产学研创新项目(BY2012069)
关键词
直流分量
电流检测
模糊迭代PI控制
DC component
current detection
fuzzy iteration PI control
