The Modeling Of DC Micro-Grid And The Research Of Control Strategy

With the rapid development of human civilization, fossil fuels (oil, coal and natural gas reserves) gradually reduced, the energy crisis coming. What is more serious is that the carbon dioxide gas generated after the combustion of fossil fuels can lead to the greenhouse effect and global warming. In this case, the distributed clean and renewable energy is more and more attention. Distributed energy is not only environmentally friendly and renewable natural advantages, but also can make the in situ energy consumption, saving the cost of power transmission. However, distributed power has its own shortcomings, such as randomness, poor controllability, high access costs, these defects restrict the development of the distributed power supply. But the emergence and development of micro grid distributed power can be overcome a large number of network faults, reducing the influence on power system.This paper mainly analyzes the basic principle of photovoltaic, wind turbine and battery distributed power supply, Based on PSCAD (power systems computer aided design) in a photovoltaic cell, permanent magnet wind turbines, batteries and related control loop model, and build a DC Distributed Power Grid with multi micro model.Based on the basic structures of DC micro grid control strategy, put forward a prediction of DC based on the micro grid control strategy, the strategy is applied in the DC micro grid model, and verified by testing strategy can improve the bus voltage stability. By comparing the prediction of DC micro grid control strategy and the voltage fluctuation of the strategy based on the confirmed in and off network transformation, change of light intensity. Load access or resection, prediction of DC micro grid control strategy based on a flat DC bus voltage fluctuations.