应用动态虚拟阻抗的光伏微网新型下垂无功补偿控制  

Novel Droop Reactive Power Compensation Control of Photovoltaic Microgrid Using Dynamic Virtual Parameters

作　　者：高生凯 曹炜 张旭航 GAO Shengkai;CAO Wei;ZHANG Xuhang(School of Electrical Engineering,Shanghai Electric Power University,Shanghai 200090,China;State Grid Shanghai Electric Power Company Economic Technology Research Institute,Shanghai 200120,China)

机构地区：[1]上海电力大学电气工程学院,上海200090 [2]国网上海市电力公司经济技术研究院,上海200120

出　　处：《电力电容器与无功补偿》2021年第3期176-181,共6页Power Capacitor & Reactive Power Compensation

基　　金：国家自然科学基金青年自然基金项目(51807114)。

摘　　要：在光伏构成的交流微网系统中,逆变装置通过公共连接点与大电网相连,通常采用下垂控制来维持光伏电源点的功率平衡和电压稳定,其中电压稳定通过无功补偿来实现。在光伏微网实际系统中,电压调节过大会引起电气设备脱网,针对此问题本文提出一种下垂无功补偿控制方案,具体是引入新型下垂系数来增加无功补偿动态性能。由于输电段线路阻抗不匹配,造成无功分配存在误差,针对此问题本文提出一种虚拟阻抗来提高无功分配精度,具体是采用动态虚拟阻抗来改善系统的阻性特征,补偿压降。将上述策略通过Matlab/Simulink仿真和实验来验证本文所提方案可以有效提高光伏微网控制性能。In AC micro grid system which is composed of photovoltaic,the inverter is connected to the large grid through the common connection point.The droop control is usually used to maintain the power balance and voltage stability of the photovoltaic power point and the voltage stability are achieved by reactive compensation.In the actual photovoltaic microgrid system,the excessive voltage regulation will cause the electrical equipment to be off the grid.In view of this problem,a kind of droop reactive compensation control scheme is proposed in this paper,specifically,the novel drop coefficient is introduced to increase the dynamic performance of reactive power compensation.The erros of reactive distribution is existed due to mismatching of impedance of transmission line.Aiming at this problem,a kind of virtual impedance is proposed in this paper to improve the accuracy of reactive power distribution.Specifically,the dynamic virtual impedance is used to improve the resistance characteristics of the system and compensate the voltage drop.It is proved by Matlab/Simulink simulation and experiment of the above strategy that the scheme proposed in this paper can effectively improve the control performance of PV microgrid.

关 键 词：光伏交流微网 无功补偿 改进下垂控制 动态虚拟阻抗 

分 类 号：TM615[电气工程—电力系统及自动化] TM714.3