微网分布式电源和其运行控制的研究.pdf

Subject ：Research on Operation Control and Distributed Resource of MicroGrid Specialty：Power System and Automation Name ：Zhang Yifeng （Signature） Instructor ：Shang Liqun （Signature） ABSTRACT Microgrid is a kind of power grid integrating part of small distributed power generations and local loads. As an important part of smart grid, microgrid is not only an effective complement of traditional grid but also an efficient form of using distributed power, besides, it is an important way to vigorously develop renewable energy sources, improve reliability of power supply, and expand power supply system capacity. As the core of the microgrid system, inverter is required to output high quality waveforms of voltage. After the control method of the inverter is theoretical analyzed, the outer voltage loop and internal current loop are used in the double closed loop control system, and the disadvantages of slow dynamic response and weak bandwidth control force of the inverter are improved, meanwhile, the parameters selection of the control system and LC filter are derived. According to the analysis of the dual-loop control inverter and output waveforms, it has been shown that the control method can meet the requirements of the microgrid system. An efficient and stable control system plays an great important role in normal operation of microgrid. In this paper, three kinds of typical control strategy of microgrid including P-Q, V/f, and Droop are analyzed, and the corresponding control process based on control theory is given. The power split