Integrated Application Of SVG And Energy Storage Device In Low Voltage Microgrid

In low-voltage microgrid,due to the instability of distributed power supply,the active power of the system will fluctuate greatly,which will seriously affect the bus voltage of the system.Therefore,the static reactive power generator(SVG)and the energy storage device are used to improve the power factor of the system and maintain the bus voltage.Firstly,starting from the concept of reactive power and power factor,respectively from the sinusoidal and non-sinusoidal circuit is presented in these two aspects,and then from the Angle of consider loss this describes the equivalent circuit and working principle of SVG,determine the main circuit structure of SVG,and simple introduce phase locked loop of reactive current detection technology and SVG based on single neuron PID control strategy.Secondly,the structure design of hybrid energy storage system is analyzed,and the mathematical models of accumulator,supercapacitor and lithium battery and the corresponding charging and discharging control strategies are emphatically introduced.Finally,on the basis of the previous research,MATLAB/Simulink was used to build simulation models of SVG and hybrid energy storage system,and their performance was simulated.The simulation results showed that the single-neuron PID control strategy had better compensation effect than the traditional PID control strategy.According to different voltage variations,the hybrid energy storage system adopts the corresponding control strategy to maintain the dc bus voltage.In low voltage microgrid,SVG and hybrid energy storage system can not only maintain bus voltage,but also have better reactive power compensation effect.