Hongyi Liu, Hua Han, Yao Liu, M. Su, Xiaochao Hou, Xin Zhang
{"title":"并网级联光伏逆变器的最小通信控制","authors":"Hongyi Liu, Hua Han, Yao Liu, M. Su, Xiaochao Hou, Xin Zhang","doi":"10.1109/SPEC.2018.8635926","DOIUrl":null,"url":null,"abstract":"A minimize communication control method is proposed for photovoltaic (PV) grid-connected systems with cascaded H-bridge inverters. In the system used in this paper, PV panel in each unit is directly connected to the input port of the local H-bridge, then the output ports of these H-bridge inverters are cascaded with each other, each PV unit works at its maximum power point (MPP) to guarantee system’s maximum power generation efficiency. With communication, the inverter that connect to the point of common coupling (PCC) is controlled as a current source to keep synchronous operation with the utility grid by regulating its output current in phase with the grid voltage. The other cascaded inverters are controlled as voltage resources and keeping self-synchronization with unity power factor (PF) by the proposed control method without any communication. Finally, the common link current drives all cascaded inverters keep self-synchronization with the grid and provide maximum power with high quality to the grid. Compare with other control methods, the proposed control method only requires one communication link, the communication cost is effectively reduced, the reliability and power quality of the system are greatly improved. Simulation test verifies the correctness and validity of the proposed control strategy.","PeriodicalId":335893,"journal":{"name":"2018 IEEE 4th Southern Power Electronics Conference (SPEC)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"A Min-communication Control for Grid-connected Cascaded PV Inverters\",\"authors\":\"Hongyi Liu, Hua Han, Yao Liu, M. Su, Xiaochao Hou, Xin Zhang\",\"doi\":\"10.1109/SPEC.2018.8635926\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"A minimize communication control method is proposed for photovoltaic (PV) grid-connected systems with cascaded H-bridge inverters. In the system used in this paper, PV panel in each unit is directly connected to the input port of the local H-bridge, then the output ports of these H-bridge inverters are cascaded with each other, each PV unit works at its maximum power point (MPP) to guarantee system’s maximum power generation efficiency. With communication, the inverter that connect to the point of common coupling (PCC) is controlled as a current source to keep synchronous operation with the utility grid by regulating its output current in phase with the grid voltage. The other cascaded inverters are controlled as voltage resources and keeping self-synchronization with unity power factor (PF) by the proposed control method without any communication. Finally, the common link current drives all cascaded inverters keep self-synchronization with the grid and provide maximum power with high quality to the grid. Compare with other control methods, the proposed control method only requires one communication link, the communication cost is effectively reduced, the reliability and power quality of the system are greatly improved. Simulation test verifies the correctness and validity of the proposed control strategy.\",\"PeriodicalId\":335893,\"journal\":{\"name\":\"2018 IEEE 4th Southern Power Electronics Conference (SPEC)\",\"volume\":\"37 1\",\"pages\":\"0\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2018-12-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"2018 IEEE 4th Southern Power Electronics Conference (SPEC)\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1109/SPEC.2018.8635926\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"2018 IEEE 4th Southern Power Electronics Conference (SPEC)","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/SPEC.2018.8635926","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
A Min-communication Control for Grid-connected Cascaded PV Inverters
A minimize communication control method is proposed for photovoltaic (PV) grid-connected systems with cascaded H-bridge inverters. In the system used in this paper, PV panel in each unit is directly connected to the input port of the local H-bridge, then the output ports of these H-bridge inverters are cascaded with each other, each PV unit works at its maximum power point (MPP) to guarantee system’s maximum power generation efficiency. With communication, the inverter that connect to the point of common coupling (PCC) is controlled as a current source to keep synchronous operation with the utility grid by regulating its output current in phase with the grid voltage. The other cascaded inverters are controlled as voltage resources and keeping self-synchronization with unity power factor (PF) by the proposed control method without any communication. Finally, the common link current drives all cascaded inverters keep self-synchronization with the grid and provide maximum power with high quality to the grid. Compare with other control methods, the proposed control method only requires one communication link, the communication cost is effectively reduced, the reliability and power quality of the system are greatly improved. Simulation test verifies the correctness and validity of the proposed control strategy.