基于虛擬同步機的微網逆變器建模與控制技術研究
[Abstract]:With the increase of power demand and the development of distributed generation technology, unified cooperative management and dispatch of distributed power supply can supply power to a certain range of loads in isolated island. The microgrid technology of power exchange with the power grid has been widely used to realize large-scale distributed power generation access to the grid, but with the continuous expansion of the microgrid scale and the increasing permeability of distributed power generation, The traditional microgrid has some problems such as the increase of scheduling cost and the difficulty of expanding the system topology under centralized scheduling, such as master-slave control, hierarchical control, and so on, which is not conducive to the efficient utilization of distributed power. Because the distributed power supply is connected to the microgrid system in the form of power electronic inverter, the response speed is fast and the external characteristic is hard, so it is difficult to bring the rotating inertia of the synchronous motor to the microgrid system, which leads to the system oscillation easily. The overall stability is not high. In this paper, the method of virtual synchronous machine is used in the control of microgrid inverter. The controller is designed by simulating the motion equation of the rotor of synchronous motor while realizing the distributed control of microgrid, which produces the external characteristics similar to that of the synchronous motor. Improve the overall inertia of the system. Compared with the existing methods, this paper realizes the distributed frequency and voltage regulation based on the multi-loop control, the outer loop adds virtual inertia, and the inner loop realizes the output voltage adjustment without difference and improves the dynamic response of the current. An improved vector orientation method based on virtual flux linkage is designed, which is applied to the process of control and grid-connected pre-synchronization in dq coordinate system. The output voltage is tracked without difference to the grid voltage, and the smooth switching of islanding and grid-connected mode is realized. An adaptive control mechanism of virtual inertial time constant based on fuzzy controller is designed, which provides a wide inertial bandwidth for the virtual synchronous machine and suppresses the frequency fluctuation caused by the microgrid oscillation. And show better dynamic characteristics in load switching and distributed power access. In this paper, the virtual synchronous machine multi-loop control structure, grid-connected strategy and parameter adaptive adjustment method are all built under the Matlab/simulink platform, and an example is given. The experimental results are compared with the existing methods. It is proved that the proposed method is effective and the control performance is improved. It has some reference value for large-scale utilization of distributed power generation and power interaction between microgrid and power grid side.
【學位授予單位】:浙江大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:TM464;TM727
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