不平衡电网电压下三相并网逆变器的控制策略分析  

Analysis of Three-phase Solar Inverter Control Strategy under Unbalanced Grid Voltage

作　　者：易善军 徐柳飞 张文军[1] 张文斌 YI Shanjun;XU Liufei;ZHANG Wenjun;ZHANG Wenbin(State Grid East Inner Mongolia Electric Power Supply Co.,Ltd.,Hohhot 010020,China;NARI Group Corporation(State Grid Electric Power Research Institute),Nanjing 211106,China;NARI Technology Co.,Ltd.,Nanjing 211106,China)

机构地区：[1]国网内蒙古东部电力有限公司,内蒙古呼和浩特010020 [2]国网南京南瑞集团公司(国网电力科学研究院),江苏南京211106 [3]国电南瑞科技股份有限公司,江苏南京211106

出　　处：《微型电脑应用》2023年第8期197-200,共4页Microcomputer Applications

摘　　要：针对不平衡电网电压并网成功率低,逆变器控制能力不足的问题,对不平衡电力数据进行整定,通过设计径向基函数(RBF)自适应控制网络完成电力设备在三相不平衡环境下的配合调节,由PI调节器完成参数调节,进而增加并网成功率;采用模型预测控制(MPC)算法对三相异常数据进行排查,通过对比两种不同环境下并网关系推算最佳并网策略,实现电力设备的安全并网。试验表明,采用的KLH系列逆变器,容量为2 KVA/220 V,用这种方式并网产生的不平衡电压变化为85.8 V,并网成功率为95.2%。In view of the low success rate of unbalanced grid voltage grid connection and insufficient inverter control capability,this paper processes the unbalanced power data,and completes the power equipment in the third stage by designing a radial basis function(RBF)adaptive control network.The coordination adjustment under the phase imbalance environment is adjusted by the PI regulator to increase the success rate of grid connection.The model predictive control(MPC)algorithm is used to investigate the three-phase abnormal data,and the two different environments are compared.The grid connection relationship calculates the best grid connection strategy to realize the safe grid connection of power equipment.The test shows that the KLH series inverter used in this study has a capacity of 2 KVA/220 V,the unbalanced voltage change generated in the grid connection is 85.8 V,and the grid connection success rate is 95.2%.

关 键 词：不平衡电网电压 三相并网逆变器 同步旋转双闭环模型 RBF网络 MPC控制算法 

分 类 号：TM712[电气工程—电力系统及自动化]