一种具有自适应电压补偿和恢复功能的微电网功率均分策略  

A MICROGRID POWER SHARING STRATEGY WITH ADAPTIVE VOLTAGE COMPENSATION AND RESTORATION

作　　者：彭志豪 黄海益 杨苓 Peng Zhihao;Huang Haiyi;Yang Ling(School of Automation,Guangdong University of Technology,Guangzhou 510006,China)

机构地区：[1]广东工业大学自动化学院,广州510006

出　　处：《太阳能学报》2023年第7期61-70,共10页Acta Energiae Solaris Sinica

基　　金：国家自然科学基金(52107185);广东省基础与应用基础研究基金(2019A1515110768)。

摘　　要：在高/低电压等级微电网中,线路参数的差异导致逆变器输出功率无法精确均分且系统间出现环流,传统的下垂控制未能较好解决此问题。为此,该文提出一种具有自适应电压补偿和恢复功能的微电网功率均分控制策略。首先,通过引入虚拟阻抗,使高/低电压等级下逆变器输出总阻抗呈感性/阻性;其次,在改进下垂控制中提出自适应电压补偿方法,消除系统输出电压间的偏差,实现无功/有功功率的精确均分,但存在系统总输出功率下降的问题;然后,在上述基础上进一步提出电压恢复方法,在不影响功率均分精度的前提下,使系统总输出功率恢复至初始状态;最后,通过实验验证所提策略的有效性。In high/low voltage level microgrids,the difference in line parameters leads to the fact that the output power of inverter cannot be accurately shared and a circulating current occurs between the systems.The traditional droop control cannot solve this problem well.To this end,a microgrid power sharing control strategy with adaptive voltage compensation and restoration is proposed in this paper.Firstly,by introducing virtual impedance,the total output impedance of inverter at high/low voltage levels is inductive/resistive.Secondly,an adaptive voltage compensation method is proposed in the improved droop control,which eliminates the deviation between the output voltages of system and realizes the accurate equalization of reactive power/active power,but there is a problem that the total output power of system decreases.Then,on the basis of the above,the voltage recovery method is proposed to restore the total output power of system to the initial state without affecting the power sharing accuracy.Finally,the effectiveness of the proposed strategy is verified by experiments.

关 键 词：微电网 逆变器并联系统 功率分配 自适应电压补偿和恢复 

分 类 号：TM464[电气工程—电器]