| Energy crisis and Environmental issues has become one of the major bottlenecks in the global. Generation of Renewable energy has become an important way to solve this problem. Because renewable energy sources such as solar, wind power and other have high quality of electrical energy and power technology, renewable energy sources has become the most dynamic research. Distributed grid system connected to the grid through the filter. This paper designed a three-phase inverter control system of quasi-PR controller LCL filter Based on the genetic algorithm optimization. The main work is as follows:1. For the requirements of the energy quality in PV generation system, Proposed a three-phase PV inverter LCL filter topology, Study the derived mathematical model in abc,dq coordinate axis.2. The paper increased the series resistance in capacitor branch, Analyzed the features of damping resistor, derived the constraints of LCL filter parameters, Finally, optimized damped LCL filter parameters by the improved genetic algorithm.3. According to the advantages of LCL inverter in stationary αβ coordinate axis, For the PV LCL inverter coupling in abc and dq axis, introduced the Quasi-PR controller in coordinate system, gived the detailed design of the parameters PR controller.4. Build simulation model of the PV grid-connected inverter in Matlab/Simulink, Do simulation of the simulation model of the PV grid-connected inverter under ideal grid inverter. Finally, using the GUI interface of MATLAB, created a simulation platform of the grid-connected inverter system.Simulation results show that: In this paper, the design of the three-phase grid inverter can achieve fast tracking the reference signal, grid current has a good steady-state and dynamic performance, the design of the harmonic compensation has better results compared to traditional harmonic compensation, grid functions can be achieved. GUI is easy to operate, can be directly observed waveform changes of the grid current and harmonic content. |
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