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For the grid connected by high proportion distributed power, energy storage system can effectively reduce the adverse impact of micro grid power fluctuation on the grid. Because of the high cost of energy storage system, it is necessary to optimize the capacity of energy storage system. Therefore, this paper proposes a capacity optimization method of energy storage system. Based on the comprehensive consideration of system objectives, construction costs, energy storage security and other factors, the simulation analysis model of the system is established, and the control strategy is optimized. In this paper, the algorithm is applied to the construction of microgrid demonstration project. The experimental results verify the effectiveness of the proposed method.

Microgrid is a new type of power supply structure and will play an important role in ensuring power supply. Because of the high cost of micro grid construction, this is very necessary to determine the lowest capacity configuration and realize the best function configuration, which is an urgent problem in engineering construction. Therefore, this paper first establishes simulation analysis model, puts forward economic optimization model and constraints, and formulates system configuration scheme and construction cost. The results show that the method is feasible and effective. This scheme not only reduces the operation cost of the system, but also provides a reference for the construction of microgrid engineering.

Power dispatching network is a core of cardinal significance, which always suffers from the network attacks from both inside and outside of the local-area network. The network attack detection process must perform tremendously good, or will disturb the normal business traffic. This paper proposed an automatous method to inspect the net traffic and identify the abnormal traffic only by analyzing several signals rather than probing the network traffic packet.

As doubly fed induction generators (DFIGs) are connected to the power system by the converters which decouple the rotor speed and the grid frequency, high penetration of DFIG- based wind farms may cause the lack of power system equivalent rotation inertia and primary frequency control contribution. In order to improve the DFIGs' contribution to system frequency regulation, this paper presents a new integrated frequency control strategy combining the inertial control and pitch angle control. With the proposed control strategy, DFIGs will release kinetic energy to support the power system inertia and make use of reserved capacity to participate the long-term frequency control. A power system including synchronous generators and DFIG-based wind farm is modeled in MATLAB/Simulink and the control strategy is validated in simulation studies. The results show that DFIGs with proposed control strategy can provide effective inertia support and reduce the static error of post-disturbance grid frequency.