基于背靠背并网模式的微电网模糊控制研究  

Fuzzy Control Research of Microgrid Based on Back-to-Back Grid Connection Mode

作　　者：王锟 胡平 刘晓莎 WANG Kun;HU Ping;LIU Xiaosha(School of Electrical Engineering,Shaanxi Polytechnic Institute,Xianyang 712000,China;Xianyang Key Laboratory of New Energy and Microgrid System,Xianyang 712000,China)

机构地区：[1]陕西工业职业技术学院电气工程学院,陕西咸阳712000 [2]咸阳市新能源及微电网重点实验室,陕西咸阳712000

出　　处：《自动化仪表》2023年第2期48-52,58,共6页Process Automation Instrumentation

基　　金：陕西省自然科学基础研究计划基金资助项目(2022JM-388);陕西工业职业技术学院基金资助项目(KCTD19-03)。

摘　　要：背靠背电压源变流器(VSC)并网多用于电网间并列运行。随着微电网不断并入电网,供电可靠性得到改善。为提高背靠背并网装置利用率、改善电网效率,提出了采用背靠背VSC并网装置将大电网与微电网连接的方式进行联网运行。为实现功率传输的额度和速率的动态调整,在背靠背VSC双闭环控制中,提出了外环模糊控制策略,使用有功功率传输量与频率差值之比和无功功率传输量与电压差值之比确定外环控制参考值,以实现控制参数自动调节。电磁暂态仿真结果验证了该并网方式的有效性,表明了采用模糊控制策略能提高微电网并网系统的动态响应特性和稳定性。该研究为微电网良好接入大电网以及提高电网运行效率提供了有效的方案,对背靠背并网的应用发展具有积极推动作用。Back-to-back voltage source converter(VSC) are mostly used for grid-to-grid parallel operation. With the continuous integration of microgrids into the grid, the reliability of power supply has been improved. To increase the utilization rate of back-to-back grid-connected devices and improve the grid efficiency, a back-to-back VSC grid-connected device is proposed to connect large grids to microgrids for network operation. To achieve dynamic adjustment of the amount and rate of power transfer, an outer-loop fuzzy control strategy is proposed in the back-to-back VSC double closed-loop control, using the ratio of active power transfer to frequency difference and the ratio of reactive power transfer to voltage difference to determine the outer-loop control reference values for automatic adjustment of control parameters. The electromagnetic transient simulation results verify the effectiveness of this grid connection method and show that the use of fuzzy control strategy can improve the dynamic response characteristics and stability of the microgrid grid connection system. This study provides an effective solution for the good connection of microgrid to the large grid and the improvement of grid operation efficiency, which has a positive impact on the application development of back-to-back grid connection.

关 键 词：微电网 背靠背 电压源变流器 并网 模糊控制 动态响应 双闭环 电磁暂态仿真 

分 类 号：TH-39[机械工程]