| As worldwide renewable energy sources are depleted step by step and environmentalpollution becomes more and more serious, the sustainable development of humansociety has been seriously affected, which forces people to seek new alternative energysources. Solar energy which is the World’s most clean and abundant renewable energysource has got much of the attention all over the World. At present the solar power is aresearch priority of solar energy utilization. The huge network system of smart grid, andits management complications, high cost and operation difficulty make smart gridturned to intelligence micro nets, which becomes a tendency and can meet the specialrequirements of users. The paper combines the advantages of solar power andintelligence micro nets to design a10kW of photovoltaic power generation micro netssystem.In this paper, we analyze the control strategy of the nets inverter topology in detail,give an explicit analysis and explanation of the problems in island effects emerging inmicro nets system and give relevant solutions in the light of the problems. We design a10kW of photovoltaic power generation micro nets system and have related experiments.Experimental result indicates the rationality of the design of the system and thereliability and validity of the control strategy. The main content of this paper are asfollows:1. We analyze the basic Working principle of photovoltaic cells and outputcharacteristics. We introduce the calculating process of the parameters in detailbased on its properties, parameter model and give the data model of photovoltaicarray.2. According With the system, we can get the maximum power point control methodwhich is the improved method of perturbation observation through the analysis andcontrast of basic methods of the maximum power point tracking technology. Afterthat, through modeling and simulation, we can show the effectiveness of theimproved control method of perturbation observation.3. We put emphasis on a detailed introduction and analysis of the relevant contents ofthe nets system inverter. Beyond that, we give a simple description onGrid-connected theory and the power transmission, and analyze the topology of theinverter. According to the system requirements of the design, we emphasizestudying the inverter control strategy, make the simulation model and draw theconclusion separately focused on the research of the three control strategiesmentioned in the paper.4. Based on the analysis of the island control strategy, according to the micro netssystem, we can get an island strategy plan which is the active island scheme basedon phase locked loop disturbance. Through modeling, we can prove its validity. |
