Traditional Static Synchronous Compensator(STATCOM ) compensates most singly for reactive power or steady state voltage in high power field. On this point, the paper puts forward a harmonic frequency compensation technique, which can realize dynamic reactive power compensation as well as harmonic control of less than 20th power. Then, using average switching method, it gives the mathematical model on the device. Active and reactive current decoupling is realized. For the electrical model, the compensator developed uses 8-cascaded H bridge structure, together with the carrier phase-shifted SVM technology, can realize 17 level voltage waveform output, having high utilization and easy to realize digital. Finally, simulation and experimental results show that the harmonic frequency control technology developed for 6kV cascade compensator can be used on the actual electric network, with low switching frequency. The device can together compensate reactive power and control harmonic accurately and effectively.

In order to make better use of wind resources and reduce abandoned wind and improve capacity of grid accepting wind power ,this paper studies the feasibility of storing abandoned wind based on using the PHS(Pumped Hydro System). The paper has constructed model of Wind – PHS co-generation system based on operating characteristics of various types of power. Under the constraints of system demands and the technical characteristics of various types of power, the model use the minimum total operation cost of the system as the objective function, then use real coding genetic algorithm simulation to solve the problem. The results show that the use of pumped storage power station can not only reduce the abandoned wind, and the economic benefits of storage abandoned wind are better than the economic benefits of without wind abandoned. At last with evaluation and factors influencing the analysis, the conclusion that the optimal capacity of pumped storage power station in the system is expected to providing a reference which can help for the rational allocation of resources.