含飞轮储能微网的新型频率控制

New Frequency Control for Microgrids with Flywheels Energy Storage

飞轮储能系统(FESS)作为微电网频率调节的新手段,可有效减小微电网的频率波动,基于此,提出了一种适用于FESS的新型三层频率控制系统,其包括直流端口电压控制器、速度控制器和磁场定向控制系统。与传统方法不同的是,该方法在并网侧变流器中增加了频率控制器,以提高FESS的爬坡率、减少负载变化引起的频率偏差。此外,还提出了一种模式协调系统,以减少FESS运行模式由飞轮转速控制模式变为微网频率控制模式时产生的直流端口电压波动。另外,针对上述方法进行小信号分析和控制器优化设计。最后,通过实验验证了所提方法的有效性和优越性。

The flywheel energy storage system(FESS),as a new means of microgrid frequency regulation,can effectively reduce the frequency fluctuation of microgrid.Based on this,a novel three-layer frequency control system suitable for FESS was proposed,which included DC port voltage controller,velocity controller and field-oriented control system.Different from the traditional method,the proposed method added a frequency controller to the gridconnected side converter to improve the climbing rate of FESS and reduce the frequency deviation caused by load changes.In addition,a mode coordination system was proposed to reduce the DC port voltage fluctuation when the FESS operation mode was changed from flywheel speed control mode to microgrid frequency control mode.In addition,small signal analysis and controller optimization design were carried out according to the above methods.Finally,the effectiveness and superiority of the proposed method were verified by experiments.