Research And Design Of Grid-connected Photovoltaic Control System

Last year, the global PV industry showed a trend of recover. Due to the policy driven, the PV market rapidly eastward. China has become the leading country in the global PV market. According to China’s current situation of energy and environment. It’s urgent for china to develop clean energy, which can complete the transformation of energy. PV as the main clean energy will play a great role in it. Our country has made a lot of contributions in PV’s popularization, such as introduce laws and regulations which can develop the PV industry. This measure greatly promoted the scholars to conduct the research of PV power generation technology.Firstly this paper establish the main plan of the grid connected photovoltaic power generation control system, which is based on the further research of grid connected PV power generation technology. This plan mainly includes the maximum power point tracking algorithm, generating method of SPWM and calculation of parameter. The maximum power point tracking center on the perturbation and observation method as the MPPT. In the aspect of the generation of SPWM wave, several method of SPWM wave generation are expatiated, finally we choose the regular sampling method as the modulation method of SPWM wave; In the aspect of parameter calculation, mainly calculate the parameter of the filter circuit and double loop control system. At the end, we establish model and simulate maximum power point tracking links and the grid-connected part. The simulation results the theory analysis and calculation of the parameters is correct.Secondly the paper introduces the design process of the hardware and software detailly. The design of hardware mainly includes: inverter driving circuit, SPWM signal processing circuit, control circuit with TMS320F28335, the current/voltage detection circuit. The design of the inverter drive circuit’s logic and parameters of current/voltage detection circuit is the key of this part. While the maximum power point tracking, the three-phase grid connected control, electric parameter sampling, serial communication and the interface of the host computer are realized by the software part. Debugging the system in the combination of software and hardware design, then through the analysis of the data shows that the system can run normally. It is preliminary to achieve the purpose of the study and provide a solution for the design of grid connected photovoltaic power generation control system.