Research On Reactive Power And Voltage Control Of Photovoltaic Power Station

In recent years,with the increasingly serious energy crisis and environmental pollution problem,It is imperative that vigorously develop and utilize renewable energy.Solar energy as an important part of renewable energy has been widely applied.However,due to the fluctuation,intermittence and randomness of solar energy,the voltage of grid connected network fluctuates,which affects the power quality and operation stability of power system.In this paper,inverters and reactive power compensation devices are taken as the main research object,and the reactive power and voltage control problems of photovoltaic power stations are studied.In order to solve the problem of voltage fluctuation of photovoltaic power plants and networks,working principle in-depth study of photovoltaic battery and inverter,establishes the corresponding mathematical model of photovoltaic battery and inverter,based on the model of the whole building photovoltaic power plants,photovoltaic power plants for the follow-up to provide theoretical support for reactive voltage control research.Aiming at the situation of multiple reactive power sources in photovoltaic power plants,the reactive power characteristics of inverter and reactive power compensation device in photovoltaic power plants are studied respectively,and corresponding control models are established.The reactive power output characteristics of inverter and SVG are verified by MATLAB simulation.Reactive power output characteristics and equivalent model of PV inverter and reactive power compensation device based on a photovoltaic power plant phase voltage and reactive power optimization control strategy,including segmentation based on shunt capacitor switching on the average light intensity curve,comparison of average voltage of each segment with the reference voltage,voltage deviation and ensure minimum access point control of shunt capacitor switching;according to the access point of the real-time detection of the calculated voltage reactive power compensation capacity,according to the corresponding objective function and equality constraints and inequality constraints of reactive power distribution of inverter and SVG based on optimal reactive power and voltage;the sensitivity of the photovoltaic power generation unit of PV power station,according to the size of the photovoltaic power generation unit sensitivity to reactive power distribution again.The validity of the strategy is verified by the simulation analysis of a photovoltaic power station model.