摘要
微电网中非线性不平衡负荷将增加电压不平衡度、增大总谐波畸变率,影响微电网电能质量。文中提出一种基于dq坐标瞬时功率理论的补偿算法,根据测量的非线性不平衡负荷瞬时电流和通过滤波算法得到或设定的其他电源提供的电流,计算分布式电源电压源逆变器(VSI)的参考电流。在补偿算法中增加倒下垂控制,实现微电网不同运行模式间的平滑转换。针对同时包含非线性不平衡负荷和线性平衡负荷的微电网,提出了并网和孤岛时分布式电源负荷的分担方式和控制策略。利用PSCAD/EMTDC仿真软件验证了该算法的正确性和微电网控制策略的有效性。
The non-linear and unbalanced load in a microgrid will increase the three-phase voltage unbalance factor and the total harmonic distortion（THD） which,in turn,will affect the microgrid power quality.A compensation algorithm for non-linear and unbalanced load based on the instantaneous power theory in dq reference frame is proposed.By measuring the instantaneous current of non-linear and unbalanced load and calculating or setting ideal instantaneous currents from other sources,the reference compensation current for voltage source inverter（VSI） is obtained.Inverse droop control is introduced to implement seamless conversion between different modes.In view of the microgrid with both the non-linear and unbalanced load and balanced and linear load,a load sharing method and a control strategy for the distributed generations（DGs） in the grid-connected mode and islanding mode are proposed.The results based on PSCAD/EMTDC simulation software have verified the correctness of the algorithm and the effectiveness of the control strategy in question.
出处
《电力系统自动化》
EI
CSCD
北大核心
2011年第9期61-66,共6页
Automation of Electric Power Systems
基金
重庆市自然科学基金资助项目(CSTC2009BB6190)
输配电装备及系统安全与新技术国家重点实验室自主研究项目(2007DA10512709208)~~
关键词
微电网
分布式电源
电能质量
非线性不平衡负荷
控制策略
microgrid
distributed generation
power quality
non-linear and unbalanced loads
control strategy
