微電網建模與仿真研究
[Abstract]:Under the increasingly serious energy problem, distributed generation technology with renewable energy has become the main direction of energy development in the future. However, because of the characteristics of voltage and frequency instability, distributed power generation technology has the characteristics of voltage and frequency instability. It is easy to make a serious impact on large power grid, so the management mode of limited distributed generation and grid connection is adopted. This results in a low degree of commercialization of distributed generation, which greatly limits the development of the technology and hinders the process of large-scale operation. The development of microgrid technology can greatly improve the present situation of distributed generation technology, stabilize the frequency and voltage of power output, and reduce the impact on large power grid. The power supply of internal basic load is guaranteed when the large power network fails, and the reliability of power supply is increased while making full use of renewable energy. Microgrid is composed of distributed power generation and power load. It can be operated under two operation modes, grid-connected and islanding, and has high reliability and stability at the same time. With the development of power electronic interface and modern control theory, microgrid combines the rated power generation unit with tens of kilowatts as a micro-power source, load, energy storage device and control device, and becomes a single controllable unit. At the same time to provide electricity to the user. Large-scale distributed energy can be connected to the medium-low voltage distribution system through the micro-grid structure, which is an effective solution to the grid connection of distributed energy. In this paper, with the help of Matlab/Simulink simulation software, the models of various components are established, and the two operation modes of microgrid and isolated grid are simulated. In the simulation of the operation part of the isolated network, the simulation of the power supply voltage drop condition is added. The simulation results show that the strategy of current double loop control in grid-connected operation mode and U / F control mode in isolated network operation mode can make the microgrid run well and ensure load supply.
【學位授予單位】:華北電力大學
【學位級別】:碩士
【學位授予年份】:2014
【分類號】:TM743
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