自适应特征谐波消除策略的并网逆变器电流跟踪优化方法  

Optimized Current Tracking Method for Grid-Connected Inverter with Adaptive Characteristic Harmonic Elimination

作　　者：刘景晖[1] 郑益慧[1] 姚钢[2] 周荔丹[2] 王昕[1] 邵峥达[3] 

机构地区：[1]上海交通大学电工与电子技术中心,上海200240 [2]上海交通大学电力传输与功率变换控制教育部重点实验室电气工程系,上海200240 [3]上海市电力公司市区供电公司,上海200080

出　　处：《电工技术学报》2013年第9期120-128,共9页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(60504010);国家高技术研究发展计划(863计划)(2008A A04Z129);流程工业综合自动化国家重点实验室开放课题基金资助

摘　　要：针对三相并网型逆变器由于死区、直流侧波动和电网电压谐波等原因造成的并网电流畸变严重现象,在配电网静止同步补偿器(D-STATCOM)模型的基础上提出将选择性特征谐波消除策略应用于并网逆变器,以优化并网电流波形、提高电流跟踪性能。该方法针对传统dq同步坐标系下的比例积分(PI)控制进行改进,增加了一个谐波补偿前馈环节,使用广义坐标变换检测主要的低次特征谐波,通过谐波注入的方式对PWM调制波进行重构以实现并网电流跟踪优化功能。在此基础上,还设计了自适应的前馈增益调整方法,利用最小均方(LMS)算法提高对谐波的补偿精度,同时利用线性适应元(ADALINE)网络的自学习能力提高对电压畸变的适应性。最后MATLAB仿真研究以及D-STATCOM试验原型验证了该方法的有效性。In order to solve the current distortion phenomenon of the three-phase grid-connected inverters caused by the dead-time effect, DC voltage fluctuation and system voltage harmonics. The selective characteristic harmonic elimination strategy was applied into grid-connected inverter to optimize grid current waveform and improve current tracking performance on the basis of distribution static synchronous compensator（D-STATCOM） model. The method improved the traditional proportion integration（PI） control under d-q synchronous coordinate system by a harmonic compensation feed-forward. It used generalized coordinate transformation for the selective detection of main low characteristic, harmonics, and reconstructed PWM modulation wave to optimize the current tracking performance. On basis of the above, an adaptive feed-forward gain adjust method was also designed. It used least mean square（LMS） algorism to improve the precision of harmonic compensation and used the adaptive linear element（ADALINE） network to improve the adaptability to voltage distortion. Finally, MATLAB simulation result and D-STATCOM experimental prototype prove the validity of this method.

关 键 词：并网逆变器D STATCOM 电流跟踪优化 特征谐波消除LMS ADALINE 

分 类 号：TM464[电气工程—电器]