Research Of Grid Connected Photovoltaic Effect On Power Distribution Network Voltage Distribution

The main development trend of photovoltaic power generation is grid connected photovoltaic power generation, but its capacity has different sizes. It will affect the stability of the traditional electric power system and bring a lot of inconvenience for stable operation of electric power system. In the traditional distribution network, the way of power supply is generally single source radial network. When the grid connected photovoltaic generation system connected to distribution network, the original distribution network will become the distribution network with distributed power. This will change the voltage distribution of distribution network. So the major completed work in this paper is:1. Composition and the classification summary of grid connected photovoltaic generation system. Based on the background and significance of the research and the present situation of the research, it describes the basic principle and characteristics of the photovoltaic cells and the composition classification of photovoltaic power generation grid connected system.2. Simulation model of the grid connected photovoltaic generation system. Through the Matlab software in Simulink platform, it is modeled and simulated the PV array, maximum power tracking control of inverter and DC/AC; the simulation results verify the validity of the model. And it establishes grid connected photovoltaic power system model, the simulation results verify the feasibility of grid connected photovoltaic system model.3. Improved forward and backward substitution method for power flow calculation. It combines the characteristics of grid connected photovoltaic power generation, the power flow calculation of traditional back/forward sweep method is effective to improve the. At the same time, it increases the correction of active power and reactive power, to make up for shortcomings of traditional algorithm, and the improved back/forward sweep method is tested and verified the advanced nature of the improved algorithm.4. To study the effect of photovoltaic power access to distribution network voltage distribution. When the photovoltaic power access to distribution network, through the description of two kinds of distribution network voltage distribution model, this paper makes a detailed analysis on the individual photovoltaic power and a plurality of photovoltaic power access to distribution network situation, and separately from the access position, access capacity and power factor of these three aspects of photovoltaic power access to distribution network the voltage distribution, and draw the corresponding rules.5. Research on strategy of voltage regulation after photovoltaic access power distribution network. Through the analysis of the distribution network voltage regulation method, this paper combines the access position adjusting transformer and photovoltaic power two regulating mode, forming an integral voltage adjustment strategy, and verify the overall combination of pressure after the strategy is feasible and effective.