摘要
介绍了微电网的结构和基于Pf-QU的传统下垂控制策略,考虑到因阻抗性质而对微电网稳定性和功率均分产生的影响,提出了基于虚拟阻抗的改进下垂控制,有效解决了微电网逆变器输出有功功率和无功功率的耦合性问题,实现功率解耦。当负荷突变时,采用改进的下垂控制策略能够很好地对负荷进行动态跟踪,且能够提高系统的稳定性。通过仿真对比分析,验证了此控制策略的正确性和优越性,能够对低压微电网的电能质量进行灵活而有效的控制。
The structure of the micro-grid and the traditional droop control strategy based on Pf-QU are introduced.Taking into account the influence of impedance properties on the stability and power sharing of the micro-grid,an improved droop control based on virtual impedance is proposed to effectively solve the problem.The network inverter outputs the coupling problem of active power and reactive power to achieve power decoupling.When the load changes abruptly,the improved droop control strategy can be used to dynamically track the load and improve the stability of the system.Through simulation and comparison analysis,the correctness and superiority of this control strategy are verified,and the power quality of low-voltage micro-grid can be controlled flexibly and effectively.
作者
彭湃
PENG Pai(Zhaoqing Power Supply Bureau of Guangdong Power Grid Co.,Ltd.,Zhaoqing 526200,Chin)
出处
《供用电》
2018年第6期60-65,共6页
Distribution & Utilization
关键词
微电网
下垂控制
功率均分
虚拟阻抗
功率解耦
micro-grid
droop control
power sharing
virtual impedance
power decoupling
