RESEARCH ON MICROGRID MODE SWITCH AND CONTROL BASED ON IMPROVED FREQUENCY ALGORITHM

In order to solve the problem of the switching of grid-connected operation and islanding operation, this paper analyzes the architecture of the microgrid and the problems of grid-connected mode switching, while introduce Improved Frequency Algorithm, whose frequency error is 0.02Hz, and response time is 60ms, it is better than the old frequency measurement way, whose frequency error is 1Hz, and response time is 40ms. This paper research and development microgrid mode switch device. This design effectively solves the problem of the frequency measurement accuracy is bad and the mode control switching time is too long, now you can do within 120ms, and well achieve "seamless "grid-connected and off-grid switch. It will have a wide role on the future of engineering applications.