| Rapid growth of consumption of traditional fossil energy and increasingly aggregating global eco-environmental problems have drawn more and more attention to the development and utilization of new energy.As a result,people have poured huge energy to study and utilize solar photovoltaic power generation due to its various advantages,such as renewability and distributed power generation.However,solar photovoltaic power generation also suffers from some disadvantages that distributed power supply have in common,including instable output power and difficulty in control.To overcome such deficiencies,eliminate the negative impact of distributed power supply on bulk power systems and give full play to the value of distributed energy generation,the Consortium for Electric Reliability Technology Solutions(CERTS)developed a new concept,i.e.micro-grid.In this study,the author conducted detailed schematic design for and theoretical research into the Photovoltaic-diesel Valley hybrid intelligent micro-grid system developed by Shenyang Institute of Engineering University Science Park.To begin with,fundamental principles and integral structure of photovoltaic diesel storage micro-grid system was elaborated,followed by schematic design of photovoltaic power generation system and battery energy storage system of this micro-grid.Schematic design of photovoltaic power generation system was mainly composed of the installation of two sets of photovoltaic arrays,design and calculation of the arrays' inclined angles and inter-array distance;schematic design of energy storage unit contained storage battery selection and concrete functions,parameter analysis of lead-acid battery and phosphoric acid iron battery and functions and control mode of battery storage inverter.Moreover,the selection and parameter analysis of main electrical devices,together with introduction to the parameters and functions of photovoltaic grid-connected inverter used in the system,were also included in this study.The model of photovoltaic grid connected inverter was determined by analyzing the wiring mode and parameter of photovoltaic system and comparing them with those of grid-connected inverters.Maximum power point tracking technology for photovoltaic system was highlighted in this study,which suggested its importance.Fundamental principles and application steps of artificial bee colony algorithm were described in detail;the application of ABC algorithm to maximum power point tracking for photovoltaic system was investigated;Cauchy distribution was applied to ABC algorithm,which,to some extent,keeps the algorithm from falling into local optimum.At the meantime,the mathematical models of photovoltaic modules were established,followed by their simulated analysis.Simulation results of ABC algorithm and particle swarm optimization suggested the superiority of ABC algorithm in maximum power point tracking for photovoltaic system.A scheme of energy management system for photovoltaic diesel storage micro-grid system was put forward at the end of this study,accompanied by introduction to the framework and functions of this energy management system,study on the implementation of major functions and analysis of its practical application. |
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