A Strategy Of Reactive Power And Voltage Control Strategy Control For Dispersed Wind Farm

Wind power technology is the most promising new energy technologies, but wind power development has brought many new problems to grid. VAR and voltage problem is important among these problems and has got a lot of attention. In recent years, with the rapid development of dispersed wind power generation technology, dispersed wind farm reactive power optimization problem is relatively prominent, using optimization algorithm for reactive power optimization, It has become a research focus for reduce the system losses and improve voltage quality. Many examples show that the optimized algorithm has high theoretical and practical value in the power systems industry. In this paper, dispersed wind farm reactive power and voltage characteristics are studied including the following respects:At first, by establishing the three wind generators’ mathematical model, analyzed the dispersed wind farm reactive voltage and reactive power losses characteristic. Put forward dispersed wind farm losses included wind turbine losses, transformer losses, transmission line losses, and so on. And to determine the larger proportion of wind turbines losses, lay the foundation for future study.Second, aiming at tracking control on overall station level of wind farm reactive power, a single-target multi-constrained optimal allocation of reactive setting method has been proposed. The voltage and reactive power control is divided into wind farm VAR calculator module(WFVC) and wind turbine generator VAR distribution module (WTGVD), By WTGVD to determine the required amount of reactive power, then assigned to each wind turbine to determine the output, when the lack of reactive power demand, invoking SVC can carry out the reactive power compensation, hardware and software configuration scheme proposed for this method, by case study, the effectiveness of this allocation setting method has been verified. Finally, on the basis of the above study, put forward to a different time levels, reactive power control method of multi-objective and multi restriction, And rely on Chao-yang dispersed wind farms, the use of adaptive genetic algorithm for reactive power optimization, by Adaptive Genetic Algorithm for reactive power optimization, to achieve the overall reactive voltage control.