孤岛模式下交直流混合微电网互联变流器新型控制策略  

A novel control strategy for an interlinking converter in an islanded hybrid AC/DC microgrid

作　　者：李忠文 李沛阳 程志平[1] 王义 随权 LI Zhongwen;LI Peiyang;CHENG Zhiping;WANG Yi;SUI Quan(School of Electrical and Information Engineering,Zhengzhou University,Zhengzhou 450001,China;National Key Laboratory of Intelligent Agricultural Power Equipment,Luoyang 471039,China)

机构地区：[1]郑州大学电气与信息工程学院,河南郑州450001 [2]智能农业动力装备全国重点实验室,河南洛阳471039

出　　处：《电力系统保护与控制》2024年第21期50-59,共10页Power System Protection and Control

基　　金：国家自然科学基金项目资助(62273312);河南省优秀青年科学基金(232300421094);中国博士后科学基金面上资助(2022M712879);郑州大学博士后科学基金(22120016)。

摘　　要：孤岛模式下交直流混合微电网可以通过互联变流器(interlinking converter,IC)实现交流微电网和直流微电网的功率互济。针对孤岛模式下IC采用传统下垂控制和基于比例积分(proportional-integral,PI)的电流控制方案存在惯性小、动态性能差的问题,提出了基于虚拟同步机(virtual synchronous generator,VSG)的新型控制策略。首先,在传统下垂控制的基础上,通过引入交流频率和直流电压的微分量,提出了改进的VSG控制方法,以提升系统的电压和频率稳定性。然后,在IC的电流环,提出了固定时间滑模控制(sliding mode control,SMC)方法,提高了系统的动态性能。接着,在交流微电网和直流微电网中引入了功率二次控制,实现了系统电压和频率恢复。最后,基于远宽StarSim硬件在环实时仿真平台搭建的交直流混合微电网模型,验证了所提新型控制策略可以实现交直流微电网子系统间功率互济,提升了系统的惯性和动态控制性能。In islanded mode,an AC/DC hybrid microgrid can realize power mutual support between the AC microgrid and the DC microgrid through an interlinking converter(IC).There is a problem in that the IC adopting the traditional droop control and the current control method based on proportional-integral(PI)has small inertia and poor dynamic performance in the islanded mode.Thus a novel control strategy based on a virtual synchronous generator(VSG)is proposed.First,based on traditional droop control,the improved VSG control method is proposed by introducing the difference of AC frequency and DC voltage to improve the stability of the system voltage and frequency.Then,in the current loop of the IC,fixed time sliding mode control(SMC)is proposed to improve the dynamic performance of the system.Next,power secondary control is introduced into the AC and DC microgrids to realize system voltage and frequency recovery.Finally,an AC/DC hybrid microgrid model built on the StarSim hardware-in-the-loop real-time simulation platform verifies that the proposed novel control strategy can realize power mutual support between AC/DC microgrid subsystems,improving system inertia and dynamic control performance.

关 键 词：交直流混合微电网 互联变流器 功率互济 虚拟同步机控制 滑模控制 二次控制 

分 类 号：TM727[电气工程—电力系统及自动化] TM46