交直流混合微电网频率和电压的无差控制  

Deviation-free Control of Frequent and Voltage of AC/DC Hybrid Micro-grid

作　　者：谢卫才[1,2,3] 李晓凤 王世豪 张细政 许志伟[3] 刘星平 XIE Weicai;LI Xiaofeng;WANG Shihao;ZHANG Xizheng;XU Zhiwei;LIU Xingping(College of Electrical&Information Engineering,Hunan Institute of Engineering,Xiangtan 411101,China;Hunan Provincial Key Laboratory of Wind Generator and Its Control,Hunan Institute of Engineering,Xiangtan 411101,China;2011 Hunan Province Cooperative Innovation Center for Wind Power Equipment and Energy Conversion,Xiangtan 411101,China)

机构地区：[1]湖南工程学院电气信息学院,湘潭411101 [2]湖南工程学院风力发电机组及控制湖南省重点实验室,湘潭411101 [3]2011湖南省风电装备与电能变换协同创新中心,湘潭411101

出　　处：《电力系统及其自动化学报》2019年第7期110-116,共7页Proceedings of the CSU-EPSA

基　　金：国家自然科学基金资助项目(61673164);湖南省科技计划重点资助项目(2016GK2018);湖南省教育厅科学研究资助项目(17K027,18A348);湖南省自然科学基金资助项目(2019JJ40059)

摘　　要：针对现有交直流混合微网的交流频率和直流母线电压都是有差调节的特点,本文将虚拟同步发电机VSG技术应用到连接交流微网和直流微网的互联变流器上。互联变流器的传输功率由直流微网母线电压偏差和交流微网频率偏差送到各自的PI控制器得出。该技术不仅使得混合微电网在负荷切换过程中响应较平滑,还能始终维持混合微网的交流频率和直流母线电压运行在额定值。采用PSCAD仿真软件进行了仿真验证,所提理论与仿真结果相吻合。Considering the deviating regulation characteristics of AC frequency and DC bus voltage of the existing AC/DC hybrid micro-grids,virtual synchronous generator(VSG)is applied to an interlinking converter(ILC)connected to the AC and DC micro-grids. The transmission power of ILC is obtained by sending the DC micro-grid bus voltage deviation and AC micro-grid frequency deviation to their own PI controllers,respectively. Using this technology,the hybrid micro-grid can not only respond smoothly during load switching,but also always keep the AC frequency and DC bus voltage of the hybrid micro-grid operating at rated values. In addition,simulations are conducted using simulation software PSCAD,which verify that the proposed theory agrees well with simulation results.

关 键 词：交直流混合微电网 互联变流器 虚拟同步发电机 有差调节 

分 类 号：TM714[电气工程—电力系统及自动化]