Research On Reactive Power Compensation Optimization Of Distribution System With Photovoltaic Station

As a new type of renewable clean energy, Solar photovoltaic has got wide attention in the field of new energy generation and it is in rapid development. Since the output of photovoltaic power generation is related to light intensity and temperature, influenced by weather conditions, along with the expansion of photovoltaic power plants scale and also the capacity, which may have a significant impact on the stable operation of the distribution network in the future. Therefore, this paper focuses on the impact of PV output randomness and volatility to the distribution network, and design optimization of reactive power compensation of distribution network with photovoltaic power plants.In this paper, the distribution network with PV power plant as research subjects, divided into the impact of grid-connected photovoltaic power plants to the distribution network, the choice of reactive power compensation location and the determination of reactive power compensation capacity. Firstly, to the low voltage distribution network with PV power plant, the voltage level is reduced, the voltage drop across transmission lines is not only affected by the reactive power, but also sometimes affected by active power and its alteration, and because the voltage change components caused by active power and reactive power work together, so to some extent reactive power compensation can compensate active voltage fluctuations caused by active power and its alteration. Secondly, adopting the comprehensive analysis of active power and reactive power sensitivity index, with full consideration of the influence of active and reactive power on the node voltage in distribution network with photovoltaic power plants, utilizing the absolute value of the comprehensive discriminant of sensitivity indicators to determine weak lines, as these weak lines are often the preferred installation of reactive power compensation device. Then, on this basis to determine the capacity of reactive power compensation, the optimal system operating costs as the objective function, including reduced system costs compensation for network loss and fees for the add compensate equipment, established reactive power compensation optimization model of distribution network with photovoltaic power plant. The model considers reactive power regulation of grid-connected inverter, and improved particle swarm optimization, making it better global convergence and optimization capability, apply improved multi-organizational PSO algorithm to optimize reactive power compensation.In my paper, the choice of reactive power compensation location and the determination of reactive power compensation capacity belong to the category of reactive power planning of distribution network. Taking photovoltaic power plants connected to distribution network into account, determined compensation capacity according to the most severe voltage fluctuations,of course other less serious situation is also applicable. Finally, to prove the correctness and feasibility of the proposed methods and algorithms by9nodes and33nodes numerical examples. With more and more photovoltaic power plants access to the distribution network, this method can effectively reduce power loss and improve the operation voltage stability and economy of distribution network.