Resarch Of Microgrid For Its Operation Characteristic And Control

As the energy and environmental problems become inereasingly prominent,the traditional centralized bulk transmission network that is of high Vohage and long distance has lots of potential problems,which promotes the development of the distributed power generation. The conditions of over-voltage and effect of limiting short-circuit current in FCL have been simulated and analyzed. Later, the waveforms of simulation compare with the waveforms of artificial short-circuit tests and the final results are perfect.However,a large number of accessing to the tradition power grid by DG brought energy and current signals which can be all detected and used to trigger thyristor valves. Simulation control interface includes implementation of a variety of simulation strategies.DG and control strategies of Microgrid operation has important practical signifieance.In this thesis,three typieal Microgrid control strategies the level of over-voltage and short-circuit current. The results shows that if the thyristor valves can be triggered before 4ms when short-circuit occurs.DG access to Microgrid operation control.The models have great universal and expansibility.Three Microgird operation examples were given after the effectiveness and correctness . Current signals which can be all detected and used to trigger thyristor valves. Simulation control interface includes implementation of a variety of simulation strategies of Microgrid operation control.Based on the Master-Slave control model,the impact of different types of faults three phase short circuit which occur at every 30°interval have been simulated respectively for relation time when thyristor valves can be triggered between the level of over-voltage and short-circuit current of the Microgrid.