低壓微電網(wǎng)系統(tǒng)運行控制技術研究與應用
[Abstract]:Distributed generation (DG) has the special advantages of less pollution, high energy efficiency, flexible installation location, less transmission and distribution resources and less transmission line loss, and has gradually become a powerful supplement and effective support for large power grid in the future. It is one of the development trends of power system in the future. However, a series of new problems such as stability, control and protection will arise when high permeable distributed generation is connected to the centralized large power grid. The background of this paper mainly comes from the Yanqing smart microgrid construction project. From the implementation of the project, the operation control technology of Yanqing microgrid project is studied. The implementation and application of Yanqing microgrid project are analyzed. (1). In this paper, the basic control strategy of microgrid is introduced, and the traditional droop characteristic based on no interconnection line and the improved algorithm based on it are analyzed, and the power transmission characteristics of parallel inverter are also discussed. (2). The theoretical analysis and adaptive damping strategy of three-phase voltage source inverter are carried out. Inverter is the core of microgrid system. In this paper, the mathematical model of three-phase voltage source inverter under dq axis is established, and then the adaptive damping strategy design of inverter control unit is introduced, and the feasibility and effectiveness of this model are verified by simulation. (3) The small signal model of parallel inverter is analyzed. Some parameters of the inverter, such as output line impedance and load impedance, control parameters such as sag gain and power detection filter constant, have a great influence on the stability of the system. (4). The simulation model of Yanqing microgrid project is analyzed. At first, a single micro-power supply is simulated to verify the correctness of the control method, and then the whole system scheme is verified, and the operation results of Yanqing micro-grid project are analyzed and explained. Simulation results verify the effectiveness and feasibility of the proposed strategy and microgrid system level control. The research and application of the operation control technology of Yanqing microgrid project is of scientific significance, practical significance and great application value.
【學位授予單位】:華北電力大學(北京)
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:TM727
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