Research On Active Power Control Among Wind Farms Under Emergency Of Power System

With the rapid development of wind power technology and increasing installed wind power capacity, the large-scale wind power connected to power system greatly impacts network’s security, stability and economic operation. In this context, this paper applies an actual wind farm cluster, to simulate and analyze the characteristic of wind farms cluster under large disturbance and variable wind speed condition. On this basis, control means that fit for wind farm cluster and emergency power abscission allocation algorithms are proposed by analyzing the conventional thermal power plants’active power control methods. Then, emergent active power control strategy of cluster that includes wind farms, photovoltaic power and conventional plants is carefully studied, and active power abscission allocation algorithm based on fast adjusting sequence and cutting sequence is proposed. Specifically, main work can be concluded as follows:(1) An actual wind farm cluster is used to simulate and analyze the characteristic of wind farm cluster under large disturbance and variable wind speed condition.(2) Firstly analyses active power abscission ways of wind farm, and four kinds of power allocation algorithm models, such as wind power allocation algorithm based on combination of cut wind farms, are proposed based on this. Then, a comprehensive evaluation index is constructed by weighted combination of five indicators, such as distribution deviation and the number of cut wind farms, to evaluate the algorithms. Finally, an actual wind power cluster is employed as an example to verify the validity of proposed algorithms. Distribution results and comprehensive evaluation index values indicate that application scope of different allocation algorithm is different and the algorithm based on the cumulative power abscission of wind farms has smallest comprehensive evaluation index value and widest application scope.(3) Emergent active power control principles, control methods and its characteristic are given. On the assumption that all conventional generators are directly dispatched by dispatching centre, active power abscission allocation algorithm based on fast adjusting sequence and cutting sequence is proposed. Where, f fast adjusting sequence and cutting sequence can be determined in two ways. Finally, an actual cluster with wind farms, photovoltaic power and conventional plants, is used as an example to verify the effectiveness of the proposed algorithm.