分布式发电系统中的储能逆变器技术研究

Research on Energy Storage Inverter for Distributed Generation System

分布式发电系统通常需要两种控制方式,第一类并网方式(与大电网连接);第二类独立方式(微网方式)。以电池为储能单元的储能逆变器也相应存在两种控制模式:电流源模式和电压源模式。为提高在微网运行时电压源模式的动态响应,采用电压外环电感电流内环的双环控制策略,并给出设计方法。为充分验证储能逆变器的两种模式的性能,搭建了两台100 kVA储能逆变器的微网平台。实验结果表明电压源模式工作的逆变器提供的微网电压无较大的畸变,动态响应较快,维持了系统的稳定运行,获得预期的效果。

Distributed generation systems typically require two control mode,the first grid connection（with large power grid connection）,the second independent mode（also called micro net mode）,with a battery for energy storage unit of storage inverter correspondingly have two kinds of control mode,the first class,the current source model,second category：voltage source mode.In order to improve dynamic response of voltage source model in microgrid operation,the outer voltage loop inductor current inner loop of the double loop control strategy is used,and the design method is given.In order to fully validate two patterns of performance of energy storage inverter,two 100 kVA storage inverter micro net platforms are set up.The experimental results show that the voltage source mode inverter provides the microfluidic network voltage with no greater distortion,fast dynamic response,maintain the stable operation of the system and obtain the anticipated effect.