| Parallel operation of inverter,as the basis of distributed power supply,can improve the capacity of inverter power supply,realize large capacity power supply,and the reliability of the system can also be improved.Parallel control technology is adopted to improve the flexibility of the system,improve the volume and weight of the power supply system,and reduce the current stress of the switch device.In this paper,a combined three-phase inverter is used as the research object.Firstly,the topology,the mathematical model and the control technology of the three-phase inverter are analyzed.Establish the three-phase inverter in the mathematical model of the synchronous reference frame ABC,two-phase rotating coordinate system,three-phase coordinate system rotation dq0,synchronous coordinate system based on the analysis of the instantaneous value PID closed-loop control with repetitive control of single inverter control technology.Secondly,the parameters of the two controllers are designed in the frequency domain,and the simulation experiment is carried out.The control system and control strategy are analyzed in the parallel system of two three-phase inverters.In order to reduce the circulation in a paralleling system proposed synchronous pulse width tracking parallel control scheme(the scheme based on reactive power closed-loop adjustment pressure,closed loop active phase control),analyzes the principle of the control strategy of parallel,parallel system in the control strategy of the system model is established,and the closed loop of voltage phase modulation control strategy for the analysis,and analyzes the P,Q controller parameters on the pressure,the influence of phase modulation link.Finally,we establish the simulation model of two parallel three-phase inverter system,under the MATLAB/Simulink to voltage vector poor circulation caused by the simulation analysis,to verify the effectiveness of the control strategy of parallel,it can be very good suppression system circulation. |
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