基于最小二乘滞环电流控制的光伏并网逆变器研究  

The Simulation of Single-Phase Photovoltaic Grid-Connected Inverter Based on Least Squares Hysteresis Current Control Algorithm

作　　者：易灵芝[1] 王根平[2] 邹晓[1] 彭寒梅[1] 李明[1] 

机构地区：[1]湘潭大学信息工程学院,湖南湘潭411105 [2]深圳职业技术学院机电分院,广东518055

出　　处：《湘潭大学自然科学学报》2008年第3期126-132,共7页Natural Science Journal of Xiangtan University

基　　金：湖南省自然科学基金资助项目(08JJ6029);湖南省学位与研究生教育资助项目(06A09);(06IND6)

摘　　要：提出一种用于光伏并网逆变器的最小二乘法定频算法,它在每一开关周期到来之前,通过对前一周期的相关参数值进行采样,确定当前周期内开关触发的时间来实现开关频率稳定和滞环电流跟踪.与其他控制方法相比,该方法能有效降低对工频电网的谐波注入,使电流误差平均值控制在最小范围内,减少稳态误差,还可实现数字化控制.最后,利用MATLAB进行双环系统建模,外环通过曲线拟合法进行最大功率跟踪,内环采用最小二乘法定频算法和滞环电流控制,仿真结果证明了该方法的有效性.The least squares algorithm of fixing the switching frequency is provided. It can realize the Hysteresis Current Control to achieve a stable switching frequency. Compared with other methods, it can reduce Grid current harmonious, assure the minimum average current error, and the minimum steady current error, and it can be digitalized easily, In the MATLAB simulation for the two loop system, the outer fulfill the maximum power tracking based on curve approaching, the inner loop adopt the current control algorithm based on least squares hysteresis, simulation result shows that the new constant frequency hysteresis current control algorithm is efficient in photovoltaic grid-connected inverter.

关 键 词：最小二乘算法 最大功率跟踪 滞环电流控制 单相光伏并网逆变器 仿真 

分 类 号：TM615[电气工程—电力系统及自动化]