摘要
针对现有储能装置的控制策略在应对电网功率波动及不平衡负载时存在电压动态响应速度慢和电压不平衡的问题,提出一种改进的下垂控制策略:首先采用一种基于复数滤波器的正负序分量计算方法,将电压分解为αβ轴上的正序和负序分量,提高不平衡电压的控制效果;然后采用基于准比例-微分谐振控制的双环控制,保证储能变流器输出电压的响应速度。经MATLAB/Simulink程序验证,改进的下垂控制策略能有效缩短电压恢复稳定的时间、补偿不平衡电压,可作为提高系统稳定性和实现削峰填谷的一种有效手段,使储能技术应用到配电网中的范围及方式越来越广。
In allusion to problems such as slow voltage dynamic response speed and unbalanced voltage of control strategy for the energy storage device in coping with power fluctuation and unbalanced load, this paper presents an improved droop con-trol strategy. The strategy firstly adopts a calculation method for positive and negative sequence components based on com-plex filter to decompose voltage into positive and negative sequence components on the cS axis so as to improve control effect of unbalanced voltage. Secondly, by using dual loop control based on quasi-proportional differential resonance control, it can guarantee response speed of output voltage of the energy storage converter. Verified by MATLAB/Simulink program, the improved droop control strategy can effectively shorten voltage recovery time and compensate unbalanced voltage. It can be taken as an effective way to improve system stability and realize peak-load shifting so as to enable energy storage technology apply in power distribution network more and more widely.
出处
《广东电力》
2017年第8期47-52,共6页
Guangdong Electric Power
关键词
储能
功率波动
双环控制
正负序分量分离
准比例微分谐振控制
energy storage
power fluctuation
dual loop control
positive and negative sequence components separation
quasi-proportional differential resonance control
