| As the energy shortage and environment pollution problem increasingly serious,development and utilization of renewable energy has attracted attention in worldwide. Inrecent years, solar photovoltaic power generation, as one of the important ways of effectiveutilization of solar energy resources, has made rapid development. However, with a largenumber of power generation device connected to the grid, power energy is contained in alarge number of harmonic caused and outlets of grid voltage and current distortion. Theinfluence to the power quality and to the utility grid is a kind of pollution. A newphotovoltaic grid-connected system is proposed in this paper. According to thecharacteristics of the photovoltaic grid inverter main circuit topology, the photovoltaic gridpower generation control combined with reactive power compensation and active filtering.Photovoltaic grid-connected power generation system effectively can also be applied to thereactive power and harmonic power grid to compensate or inhibition, for improving thequality of power supply and power at the same time.In photovoltaic grid-connected power control system, the topological structure of thephotovoltaic grid inverter system, tracking algorithm of maximum power point of solarbattery, harmonic detection and suppression, island and reactive current detection, etc. Theinstantaneous reactive power compensation and harmonic suppression, maximum powertracking technology, islanding detection technology are the focus of this paper research.The research is in order to achieve the photovoltaic grid power generation and reactivepower compensation control. According to the maximum power point tracking problem ofthe photovoltaic grid power generation V-I characteristic of photovoltaic array is analyzedwith temperature and sunshine intensity, the solar cell output power has strong nonlinear. Akind of power disturbance observation MPPT improvement method of feedforward controlwas proposed. The positive feedback of voltage and positive feedback of frequency method,the islanding of the mathematical model of detection, which were established for theislanding detection problems. Control method based on instantaneous reactive power theoryanalysis system of reactive power compensation and harmonic current detection technology.Photovoltaic grid-connected power generation electronic control system is designed anddeveloped a prototype system in the end. Photovoltaic grid-connected power generation system can be used to provide activepower to the grid, also can undertake reactive compensation of harmonic suppression.According to the system simulation and experimental research, validation system scheme iseffective and feasible. |
PDF Full Text Request