摘要
针对传统下垂控制作用下微电网的运行状态平滑切换问题,利用虚拟同步发电机思想,在控制环中加入虚拟的转动惯量方程,使得微电网逆变器具有与传统的同步发电机相似的动态性能,解决了微电网逆变器输出阻抗小、阻尼小等问题,以此来降低由于功率的急剧变化所造成的频率振荡;同时增加一个补偿控制环节,增加系统在运行状态切换情况下的稳定性。采用MATLAB软件进行仿真,验证了所设计的微电网改进下垂控制策略的有效性。
In allusion to smooth switching of operational state of the micro-grid under the role of traditional droop control,virtual moment of inertial equation is added in control loop by adopting thinking of virtual synchronous generator,which makes inverter of the micro-grid have similar dynamic performance with traditional synchronous generator and solves problems of output of the inverter such as small impedance,small damp,and so on.Thus,frequency oscillation caused by sharp change of power is reduced.Meanwhile,a compensation control is added for increasing stability of the system under the condition of operational state switching.MATLAB software is used for simulation,which verifies validity of the designed improved droop control strategy for micro-grid.
出处
《广东电力》
2016年第2期54-58,共5页
Guangdong Electric Power
基金
国家自然科学基金资助项目(61403246)
上海绿色能源并网工程技术研究中心项目资助(13DZ2251900)
上海教委科研创新项目(15ZZ085)
关键词
微电网
虚拟同步发电机
下垂控制
补偿控制
平滑切换
micro-grid
virtual synchronous generator
droop control
compensation control
smooth switching
