| Microgrid is one of the most effective way to use renewable energy,so how to achieve the microgrid energy management to optimize energy use has very important significance.A photovoltaic-energy microgrid energy management system based on fuzzy control method is established in this paper to stabilize the DC bus voltage,achieve the flexibility to switch micro-grid operation mode and realize the purpose of fully rational utilization of renewable energy.This paper mainly completed the following work:1.A photovoltaic-energy microgrid system based on AC/DC architecture is proposed and modeled,and mathematical model of each component in the energy management system is introduced in detail.On this basis,a set of energy management system based on fuzzy control is designed,and the topology of the system structure,the operation mode and the system functions are expounded in detail.2.The photovoltaic-energy microgrid energy management system based on the fuzzy variable structure control is proposed in this paper.Energy management includes two layers of up and down;the upper fuzzy controller aims to stabilize the DC bus voltage and the lower fuzzy controller aims to improve the utilization efficiency of photovoltaic power.3.The model of photovoltaic-energy microgrid energy management system based on variable structure fuzzy control is established under the environment of Matlab/Simulink,and simulation experiment is carried out in accordance with the ordinary law of electricity users.The simulation results of system can be divided into two parts of the DC bus voltage control and power balance control;the results of island and connected-grid operation modes and the energy storage unit are detailed analyzed.The research results show that photovoltaic-energy microgrid energy management strategy based on fuzzy control can ensure stable operation of system,achieve the efficient international use of distributed power,and realize demand side management independently. |
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