摘要
微网孤岛运行方式下,传统电压/频率下垂控制方法导致输出电压幅值和频率动态响应依赖于下垂增益、稳态运行点和滤波器参数。为消除这种依赖关系,通过小信号建模分析,在电压外环控制环节引入辅助控制信号,改变逆变器输出扰动方程,构造理想小信号模型,从而提高下垂控制动态性能。该策略能有效抑制输出电压幅值和频率的波动,削弱有功功率和无功功率的振荡,缩短系统暂态调整时间,并且避免了参数辨识,易于控制方法的实现。基于Matlab/Simulink的仿真验证了所提方法的可行性和有效性。
In the islanded microgrid operation mode, the traditional voltage/frequency droop control method always results in that dynamic responses of the output voltage amplitude and frequency depend on the droop gains, steady-state operating point and filter parameters. In order to eliminate these dependencies, an ideal small-signal model is constructed by the small-signal modeling analysis with introducing control auxiliary signals in the outer voltage control link to change the inverter output perturbation equations, thus improving dynamic performance of the droop control. The proposed strategy could effectively suppress the fluctuations of the output voltage amplitude and frequency, weaken the oscillation of the active power and reactive power, shorten the system transient adjustment time, and easily to be implemented by avoiding the parameter identification. Simulation results based on Matlab/Simulink show that the proposed method is feasible and effective.
出处
《电力系统及其自动化学报》
CSCD
北大核心
2015年第5期75-80,91,共7页
Proceedings of the CSU-EPSA
基金
国网上海市电力公司科技项目(20132700815-WB01)
关键词
微电网
孤岛运行
下垂控制
小信号模型
动态性能
microgrid
islanded operation
droop control
small-signal model
dynamic performance
