摘要
在传统的下垂控制中,通过电压-频率下垂方法实现功率的分配,需要用到复杂的多重环路控制和Park变换,功率分配时频率偏差较大。针对这些问题,采用了基于虚拟磁链的下垂控制方法,通过磁链-相角下垂实现功率的调节。之后,设计了一种改进的直接磁链控制器,基于直接磁链控制(DFC)原理实现了磁链相角和幅值的控制,取代了传统下垂控制中的多重反馈环路和PI调节器,具有控制简单,动态响应速度快,磁链脉动小等优点。最后,利用MATLAB/Simulink软件搭建了具有两个并联逆变器的简化微网模型用以验证设计的控制策略的有效性。仿真结果表明,所设计的控制策略具有良好的动态响应和静态稳定性,并且与传统的下垂控制方法相比,具有更小的频率偏差。
Conventionally,power budget by voltage-frequency droop method needs complicated multiple loop control and Park transformation,with greater deviation of frequency. Considering the problem,this paper provides droop control method based on virtual flux,which can adjust power by means of flux linkage-phase angle droop control. Then an improved direct flux linkage controller based on Direct Flux Control（ DFC） Theory is designed. The controller with simple control operation,rapid dynamic response and small flux ripple,succeeds in controlling the phase angle and amplitude of flux linkage and replaces the multiple feedback loop and PI regulators in conventional droop control. Finally,taking advantage of MATLAB/Simulink software,a simplified micro-grid model with two parallel converters is established to testify the validity of the designed control strategy. The simulation result shows that the control strategy possesses favorable dynamic response and static stability,with smaller frequency deviation compared with conventional droop control method.
作者
王艾萌
张佳
WANG Aimeng ZHANG Jia(School of Electrical and Electronic Engineering, North China Electric Power University, Baoding 071003, China)
出处
《华北电力大学学报（自然科学版）》
CAS
北大核心
2017年第5期62-68,共7页
Journal of North China Electric Power University：Natural Science Edition
基金
河北省自然科学基金资助项目(E2012502018)
新能源电力系统国家重点实验室开放课题(LAPS16023)
关键词
微电网
下垂控制
虚拟磁链
直接磁链控制
microgrid
droop control
virtual flux
direct flux control（DFC）
