基于滑窗DFT算法的并网逆变器多目标协调控制方法  

Multi-objective coordinated control method of grid-connected inverter based on a sliding window DFT algorithm

作　　者：王威 陈红敏 金宇航 于鹏 WANG Wei;CHEN Hongmin;JIN Yuhang;YU Peng(State Grid Zhejiang Yongkang Power Supply Co.,Ltd.,Yongkang 321300,China)

机构地区：[1]国网浙江永康市供电有限公司,浙江永康321300

出　　处：《电力系统保护与控制》2022年第9期145-151,共7页Power System Protection and Control

基　　金：国家电网公司科技项目资助(5642652FKCS35451)。

摘　　要：由于传统并网逆变器协调控制方法中没有检测畸变电流,导致控制过程中计算时间增加,控制效果不理想。针对这些问题,提出一种基于滑窗离散傅里叶变换(Discrete Fourier Transformation,DFT)算法的并网逆变器多目标协调控制方法。利用自适应抽样算法自动调整采样时间,引入滑窗DFT思想构建有源滤波器,通过滤波器对并网逆变器中的畸变电流进行检测。对并网逆变器中功率和坐标两者之间的关系进行分析,采用比例积分(Proportional Integral,PI)并联重复的复合型控制器对输出电流进行实时跟踪控制。同时根据线性叠加原理,获取并网逆变器的等效被控对象模型,简化补偿控制器设计,最终实现并网逆变器多目标协调控制。经实验测试证明,所提方法能够将计算效率提升14.6%,控制后的波畸变率下降幅度达到15.8%,功率因数增长幅度达到14.9%。Since distortion current is not detected in the traditional grid-connected inverter coordinated control method,the calculation time increases during the control process,and there is still room for improvement in the control effect.Therefore,a multi-objective coordinated control method for a grid-connected inverter based on the sliding window DFT algorithm is proposed.An adaptive sampling algorithm is used to automatically adjust the sampling time,the sliding window DFT idea is introduced to construct an active filter,and the distorted current in the grid-connected inverter is detected through the filter.It analyzes the relationship between the power and the coordinates in the grid-connected inverter,and uses the PI parallel and repeat compound controller to track the output current in real time.At the same time,using the principle of linear superposition,the equivalent object model of grid-connected inverter is obtained,the design of the compensation controller is simplified,and finally the multi-objective coordinated control of the grid-connected inverter is realized.Experimental results show that the proposed method can effectively improve the computational efficiency by14.6%,reduce the wave distortion rate by 15.8%and increase the power factor by 14.9%.

关 键 词：滑窗DFT算法 并网逆变器 多目标 协调控制 

分 类 号：TM464[电气工程—电器] TP273[自动化与计算机技术—检测技术与自动化装置]