摘要
针对微电网中多逆变器并列运行时功率分配不当导致分布式电源并网困难,特别是功率动态分配的情况下系统可靠性更加恶化的问题进行研究。首先建立了多机下垂控制模型,推导下垂系数与分布式电源容量的匹配方程,并分析系统的静态稳定性。其次,提出了一种下垂控制与虚拟同步发电机控技术相结合的功率控制策略。通过增大逆变器的惯性和阻尼系数,抑制了微电网的频率波动,从而在输出功率静态稳定的同时,削弱了分布式电源并网产生的冲击,提高微电网运行的稳定性。最后,通过Matlab/Simulink仿真验证了所提控制策略的有效性。
The power share among multiple grid-connected inverters in microgrids is investigated to strengthen the system robust,especially when power flow varies frequently.Firstly,a model of droop control based multiple grid-connected inverters is established to deduce proper droop coefficients and analyze statistic stabilities.Then,a control strategy which combines with droop control and virtual synchronous generator is proposed to improve system stability.The proposed control scheme is utilized to increase the inertia and damping for inverters to suppress the fluctuation of frequency,which provides a perfect static stability and minimize shocks.Finally,simulation experiments are conducted to verify the effectiveness and validity of the proposed strategy.
出处
《哈尔滨理工大学学报》
CAS
北大核心
2018年第1期70-74,共5页
Journal of Harbin University of Science and Technology
基金
高校强省计划(AUOQ2153000710)
关键词
微电网
逆变器并联
下垂控制
虚拟同步发电机
稳定性
microgrid
inverter parallel
droop control
virtual synchronous generator
stability
