摘要
IEEE1547.4中要求微电网在并网/离网模式间的切换过程应平滑过渡,不存在电压电流冲击。由于实际系统难以实现精准控制,尤其是目前并网开关普遍采用基于晶闸管的固态开关,使得三相并网逆变器三相开关不能同时关断,引起系统产生较大电压电流冲击,严重影响了系统的稳定运行。本文提出了基于电流补偿的微电网离网控制策略,给出了系统各变量之间的函数关系,详细分析探讨了算法变量对系统的影响,最终获得微电网切换过程中电流电压的有效控制。仿真和实验结果验证了该方法的正确性和可行性。
Smooth transition is required in micro-grid switching process based on IEEE1547. 4. Under actual conditions,the non-ideal factors influence the precise control of the system which is running. Especially currently the static switch（ Triac） is commonly used in grid system as the grid-connected switch,which is unable to achieve the three-phase grid-connected inverter to be off simultaneously,causing large voltage and current impact on the system,therefore the stable operation of the system is affected seriously and even causing off-grid mode conversion to be failed. To solve the problem caused by the delay of the grid-connected switch in the switching process,by analysis of the reason of the voltage and current impact,a control strategy of off-grid based on current compensation is proposed. Detailed analysis of the parameters affect on the system and the design basis are obtained. Simulation and experiment results verify the correctness and feasibility of the proposed method.
出处
《电工电能新技术》
CSCD
北大核心
2015年第11期24-28,36,共6页
Advanced Technology of Electrical Engineering and Energy
基金
河北省高校青年基金(QN2014183)
燕山大学青年基金(14LGB010)
河北省自然科学基金(E2013203380)资助项目
关键词
微电网
离网
三相逆变器
模式切换
电流补偿
micro-grid
off-grid
three-phase inverter
mode transfer
current compensation
