基于改进灰色关联分析单步差拍控制法的APF应用与分析  

Application and Analysis of APF Based on Advanced Grey Correlation Analysis Method and Single-Step Beat Control

作　　者：曹新莉[1] 侯晓翔 王树朋[3] 

机构地区：[1]武汉工程大学电气信息学院,湖北武汉430205 [2]河北工业大学机械学院,天津300130 [3]武汉大学电气工程学院,湖北武汉430072

出　　处：《陕西电力》2014年第3期9-14,共6页Shanxi Electric Power

基　　金：国家自然科学基金资助项目(51107098)

摘　　要：有源滤波器(APF)的现有控制方法中,传统的差拍控制法虽然具有较好的预测谐波分量的优点,但存在计算量大、灰色预测误差有风险等问题,传统灰色预测方法存在参数选取过于主观的不足。提出一种改进灰色关联分析方法,即采用灰色面积关联分析法确定评价模型的分辨系数,实现关联的整体性,计算出单步灰色预测的谐波电流值;根据APF上一时刻的输出电流和当前时刻开关状态的特点,采用经典电路理论建立差分方程,计算出APF的预测输出电流。通过建立含预测输出电流与预测谐波电流关系的目标函数,得到下一时刻的开关控制模式。仿真结果表明,采用改进灰色关联分析单步差拍控制法的电源电流畸变率下降到2.34%,谐波总含量降低至1.212 3 A,较传统方法降低约0.6%,谐波含量少于其他2种控制方法,预测精度得到提高。Traditional beat control method has the shortage of amount of calculation and the risk of gray prediction error in spite of the preferable harmonic wave prediction ability.Meanwhile parameter selection based on traditional grey forecasting method is too subjective.An advanced grey association analysis method is proposed by using grey area relation analysis to determine the distinguishing coefficient in the evaluation model for the correlation integrity and calculate the single step grey prediction of harmonic current value.According to the output current of the APF on last moment and the current switch states,APF output current can be calculated by adopting the classical circuit theory and establishing the difference equation.The next moment switch control modes can be obtained through the objective function established by the forecasting output current and the forecasting harmonic current.The simulation results show that the power supply current distortion rate falls to 2.34%and the total harmonic content is reduced to1.2123A by 0.6%compared with the traditional method by using the advanced grey relation analysis and single-step difference frequency control method.Harmonic content is less than that in the other two control methods and the prediction accuracy is also improved.

关 键 词：有源滤波器 单步差拍控制 灰色关联分析 谐波 

分 类 号：TP399[自动化与计算机技术—计算机应用技术]