摘要
微网中可能含有多个控制特性不同的分布式电源,其中光伏发电一般采用PQ控制策略,实现有功和无功功率的指定控制。直流稳定型电源采用Droop控制策略,按下垂特性调节频率和电压。在Matlab/Simulink仿真环境中建立PQ和Droop两种控制策略的模型,通过仿真算例获得微网运行特性,仿真表明综合采用两种控制策略能够在微网运行模式切换、孤岛模式下负荷投切、光伏发电出力变化情况下保证敏感负荷的电能质量和微网的频率与电压的稳定,但在孤岛重并网时可能出现微网运行失败。
There may be several distributed sources of different control features in microgrid,of which PQ control strategy is adopted in Photovoltaic generation generally,so as to realize the designed control of active power and reactive power.A droop control strategy is adopted in stable DC source,frequency and voltage are regulated in terms of droop characteristic.The models of PQ and Droop control strategy were established in the environment of Matlab/Simulink,and the operation characteristics of Microgrid were got through simulation.The result demonstrate that by using these two control strategies,the operation variations of the Microgrid,the change of load and the changing of electrical power can be ensured,but it may fail in grid-connected again.
出处
《电气开关》
2011年第1期48-51,54,共5页
Electric Switchgear
