一种统一并离网模式的串联型光伏微网分层分布式控制策略  

Distributed hierarchical control of series-type photovoltaic microgrid for both grid-connected and islanded modes

作　　者：李铁成 胡雪凯 侯小超 王磊 周昊 孙凯[2] LI Tiecheng;HU Xuekai;HOU Xiaochao;WANG Lei;ZHOU Hao;SUN Kai(State Grid Hebei Electric Power Research Institute,Shijiazhuang 050021,China;Department of Electrical Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]国网河北省电力有限公司电力科学研究院,河北石家庄050021 [2]清华大学电机工程与应用电子技术系,北京100084

出　　处：《电工电能新技术》2023年第6期1-12,共12页Advanced Technology of Electrical Engineering and Energy

基　　金：国网河北电力有限公司电力科学研究院项目(B704DY220077)。

摘　　要：相较于传统并联型微电网,串联型微电网将低压微源变换器输出端直接相串联进行升压供电,具有无需额外升压环节、无环流问题、电压质量高、系统效率高、功率协调控制简单等优点,为微电网的组网方式提供了一种新的有效途径。面向串联光伏微电网系统,本文提出了一种统一并离网模式的双层分布式控制策略,基于串联光伏模块邻近通信的功率因数角一致性协议,底层一次控制实现频率同步和功率协调,上层二次控制实现并离网模式管理、并网下功率优化和离网下电压频率恢复等功能,所提分层分布式控制能够保证并离网双模式及其无缝切换下的稳定运行。最后搭建了四台逆变器串联实验平台,结果验证了所提控制方法的可行性和有效性。Compared with the traditional parallel-type microgrid,the series-type microgrid directly utilizes the output-end stacked configuration of low-voltage micro-source converters,which has the advantages of no additional boost sector,no circulating-current problem,high voltage quality,high system efficiency,and simple power coordination control.And then this series-type architecture provides a new effective way for integrating renewable microgrids.For the series photovoltaic system,this paper proposes a two-layer distributed control strategy of unified on-grid and off-grid modes.Based on the power-factor-angle consistency protocol of the adjacent communication among series photovoltaic modules,the bottom-layer primary control realizes frequency synchronization and power coordination,and the secondary control at the upper-layer realizes the multiple operation functions,including grid-mode management,on-grid power optimization,off-grid voltage and frequency recovery.The distributed hierarchical control can ensure the stable operation under the dual-mode and mode seamless switching.Finally,a series-type experiment platform of four inverters is built,and the feasibility and effectiveness of the proposed control method are verified.

关 键 词：交流微电网 光伏并网发电 串联型逆变器 分布式控制 

分 类 号：TM711[电气工程—电力系统及自动化]