Research On Simulation Platform Of Power Grid With Distributed Photovoltaic Generation

With increasingly serious energy crisis and new energy power generation technology continuously improving, distributed photovoltaic generation is growing significantly in China. The grid-connection of photovoltaic generators will change the original power flow, relay protection and scheduling model. Qualitative and quantitative analysis of this influence can be made in simulation software.Analyzed the advantages and shortcomings of MATLAB/SIMULINK, PowerWorld, PSASP, PSCAD simulation software in distributed photovoltaic generation simulation, learn from their advantages, this paper researches on simulation platform of power grid with distributed photovoltaic generation. This platform is base on the design of graphic model and database integration, has developed five main functions:electric main wiring drawing, topology, short circuit calculation, power flow calculation and setting calculation. Power flow data and settings’ value can be visually marked on the graphic. It can be used to analyze the influence of distributed photovoltaic generation on distribution network.This paper combined the existing C++/Qt framework with the functional requirements of simulation platform, proposed "bus-branch directly search" topology algorithm. This paper breakthrough the traditional concept of "does not need to iterate slack node’s complex voltage in power flow calculation", and developed the Gauss-Seidel power flow algorithm which iterating slack node’s complex voltage. Analyzed the existing distribution network setting calculation systems, put forward the concept of Chinese function code user-defined setting calculation formula, and implemented it in the simulation platform, which can improved the adaptive ability of traditional calculation theory using in distribution network with distributed generation.The simulation case of the roof photovoltaic power station in our campus can verify the correctness of this platform’s functions.