摘要
针对微网中大量接入不对称负载且日益增多的现状,引起的三相电压不平衡问题,提出基于三相四桥臂逆变器的多状态分层协同补偿策略。利用四桥臂并网逆变器三相输出独立的特点,采用双同步坐标系解耦软件锁相准确跟踪微网相位,根据电网三相电压值的大小,对发电装置发出的电源进行三相功率分配,对低电压相进行功率补偿以实现微电网电压的平衡。利用MATLAB/Simulink进行建模仿真,并对个别状态进行了试验。结果表明,对于微电网中可能存在的电压不平衡情况,所提出的补偿控制策略可以有效改善电压不平衡的问题,并对其进行补偿。
Aiming at the problem of three-phase voltage imbalance caused by an increasing large number of asymmetric loads connected to the microgrid,a multi-state hierarchical cooperative compensation strategy based on three-phase four-leg inverters was proposed.Taking the advantage of the independent three-phase output of the four-leg grid-connected inverter,the dual-synchronous coordinate system decoupling software is used to accurately track the phase of the microgrid.three-phase power distribution is performed on the power generated by the power generation device,and power compensation is performed on the low-voltage phase to achieve the balance of the micro-grid voltage.MATLAB/Simulink is used for modeling,simulation and experiments with individual states.The results show that the proposed compensation control strategy has a good improvement effect for the possible voltage imbalance in the microgrid.
作者
邱菱洁
Qiu Lingjie(School of Electric Power,South China University of Technology,Guangzhou Guangdong 510640,China)
出处
《电气自动化》
2021年第4期46-49,70,共5页
Electrical Automation
关键词
不平衡电压
微电网
并网逆变
不平衡控制策略
分级控制
unbalanced voltage
micro-grid
grid-tied inverter
unbalanced voltage control strategy
hierarchical control
