VSG Moment of Inertia Adaptive Control Method for Photovoltaic Grid Connected Inverter
The virtual synchronous generator is the main equipment for controlling the electronic con-verter in the photovoltaic grid connected inverter,but it is vulnerable to the impact of the dynamic per-formance of photovoltaic power generation,resulting in low control accuracy of the moment of inertia.Therefore,an adaptive control method of VSG moment of inertia for photovoltaic grid connected inverter is proposed.According to the VSG structure of photovoltaic grid connected inverter,the steady-state output of VSG is generated in the synchronous generator,and the influence of power output on the characteristics of inverter VSG is obtained.By calculating the functional relationship between the moment of inertia and inverter frequency fluctuation,the damping coefficient and frequency change degree are obtained.The mo-ment of inertia is adjusted according to the real-time situation of angular velocity deviation and change rate,and the load switching conditions of different degrees are determined to obtain high-precision adap-tive control results of moment of inertia.The experimental results show that the proposed method can quickly enter a stable state in 0.26 s when comparing the output active power and reactive power,and the moment of inertia tends to be stable in 0.40 s,which proves that the power control effect of the method is good and the high-precision control of the moment of inertia can be achieved.
photovoltaic grid connectiondamping coefficientinverteradaptive controlVSG moment of inertia
万方数据
维普
