Then apply sensitivity method to derive voltage/reactive power sensitivity coefficient matrix; this matrix is the product of two special matrices, one is symmetric and the other is diagonal. It can be demonstrated that the symmetric one has a relatively bigger value at the diagonal line; combined with the diagonal one, several simple conclusions can be obtained. According to the conclusions, quantitative voltage control flow can be established. In addition, operating mode of wind turbine generator is taken into account in the simulation process. Simulation results of IEEE 9 nodes system and an actual system demonstrate the validity of proposed measures. IntroductionWith the rapid development of wind power, integrating it into the power system has great effect on the system security and economic dispatch, causing series of problems. The reactive power and voltage problem is one of them, catching attention gradually [1]. Reference [2] studied reactive power regulation ability of doubly-fed induction generators. Reference [3] investigated the impacts of DFIG operation modes on system voltage stability and pointed out that constant-voltage control has a greater advantage than constant-power factor control on improving the system voltage stability by taking full advantages of DFIG's reactive power regulation ability. However, considering that DFIG may work in constant power factor mode and reactive power regulation of all DFIGs is complex and time-consuming, quantitative voltage control at some important nodes is necessary. This paper establishes quantitative voltage control process based on sensitivity coefficient; when voltages fluctuate because of wind speed variation, the voltage level of wind base can be maintained by guaranteeing the voltages at some key nodes qualified.
Abstract-When emergent active power abscission command is given to wind farm cluster by dispatching center, it is necessary for wind farms to coordinate with each other to optimize power abscission distribution. This paper firstly analyzes 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.Key words-wind farms; emergent power abscission; wind power distribution; cumulative amount of emergent power abscission; comprehensive evaluation index
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