Research On Coordinated Control Of Distributed Generation System Connected With Grid

Centralized power supply, large power grid interconnection unified, long-distance transmission, large power units have become the main form of power system. But there are some deficiencies in this form, such as the low management level, the low level of environmental protection substandard, and the limited ability to track load. Enhancing energy production and developing reliable new energy must be faced in the process of economic development. With the appearance of new mode power supply-distributed generation, large power unit combined with a distributed system is able to increase reliability and become the direction of world's power industry development in the 21st century.This paper studies the distributed generation system, and the stability control of network which includes asynchronous generators and power electronic converters forms of distributed generation has been studied particularly. The Mathematical models of asynchronous wind turbines, fuel cell systems and SMES are established. SMES can maintain system ability in the field of grid stability and failure conditions. This paper improves inverter and network control strategies, and system which have external fault, voltage drop and load disturbance are simulated. The results show that the design method can effectively maintain the stability of the system operation and dynamic performance.The fuzzy neural network is applicable to the coordinated control of distributed generation, and fuzzy coordinated control strategy is established. The asynchronous wind power systems and fuel cell network system are simulated respectively. Compared with conventional control mode, the results show that coordinated control can be better to maintain the stable operation of the state and improve the unit's operating conditions under fault conditions. It has a good dynamic response, and obtains better control performance.