The electric energy quality problems caused by the running of wind power grid integration such as flicker and harmonic wave are increasingly prominent with the increase of the proportion of wind power. This paper describes the impact of the wind turbine connected to the power grid on the electric energy quality and conducts a trial test and proposes measures to improve the quality of electric energy such as improving the grid structure, improving voltage level of wind farm access system and the application of dynamic reactive compensation to the SVC and so on.

The article studies on the application of the shuffled frog leaping algorithm (SFLA) in power distribution network reconfiguration, taking the minimum loss and voltage quality of distribution network as a multi-objective function. The article improves the initial solution generation strategy of traditional genetic algorithm, which ensures the initial solution is feasible solution. Shuffled frog leaping algorithm and genetic algorithms are combined and proposed as shuffled frog leaping genetic algorithm (SFLGA). The algorithm uses the efficient coding strategy based on the basic loop and initial solution generation strategy, improves the calculation efficiency. The algorithm is verified by simulation results from test case on IEEE 33-bus system with distributed generations.

Due to its unique advantages in the construction, operation, maintenance and management and other aspects, the digital information substation has achieved rapid development in China in recent years, and many areas are conducting the pilot actively. According to the design features of the Baiyangdian 220kV digital information substation in Baoding City of Hebei Province in China, this paper analyzes some key technologies in the engineering design and implementation. The digital substation is mainly hierarchically constructed by the optoelectronic transformer, the intelligent primary devices and the network secondary devices on the basis of IEC61850 communication protocol, and it is the modern substation that can achieve information sharing and interoperability between the devices. Finally, the paper proposes solutions to the information security issue of the digital information substation.