Autodisturbance Rejection Control of Reactive Voltage in Photovoltaic Grid Connected Inverters by Integrating Frequency Domain Identification and Disturbance Observation
Photovoltaic power generation is easily affected by weather and other factors,which may lead to sudden changes and significant fluctuations in the DC side bus voltage,and may even cause system collapse.In order to ensure the safe and stable operation of the power system,a self-disturbance rejection control method for reactive power and voltage of photovoltaic grid connected inverters was proposed,which integrated frequency domain identification and disturbance observation.On the basis of controlling the output voltage and current,a mathematical model of the photovoltaic grid connected inverter was constructed.The disturbance signal estimated by the disturbance observer was used for feedforward control,and the frequency domain identification method was used to achieve automatic disturbance rejection control of the reactive voltage of the photovoltaic grid connected inverter.The experimental results show that the inverter controlled by the proposed method can recover to steady state only after half a power frequency cycle,and the current remains at 13 A continuously at 0.1～0.4 s.It is proved that the method has strong load disturbance suppression ability and can effectively avoid power system collapse.
frequency domain identificationdisturbance observationphotovoltaic grid-connectedinverterreactive voltageself-disturbance control
万方数据
维普
