Voltage Stability Research Based On Optimal Allocation Method Of Dynamic Compensator And Partition

With the development of modern power system* grid structure has gradually shown the characteristics of both large scale and complexity. While urban load increases continuous* which directly results in a substantial of power transmission from outside and remote regions to load center. Therefore, the modern city grid presents a receiving-end features except the two characteristics above. These characteristics together lead to the insufficiency of reactive power reserves and compensation, which makes it difficult for operators to control the voltage, and challenges the voltage stability of grid.In order to improve the level of voltage stability, this paper studies the optimal configuration of dynamic reactive power compensation and its partition approach, specific work is as follows:Firstly, considering the effect of power system reactive power transmission, this paper proposed a new method of dynamic reactive power configuration based on valid quantity of compensation. Based on generator's effective reactive power reserve, and the effective reactive power reserve of dynamic reactive power compensation device, this method considered critical bus voltage/reactive power sensitivity to determine the effective reactive factors of dynamic reactive power sources after configuring the reactive power compensation device, and defined the effective quantity of reactive power compensation. Furthermore, with the goal of maximizing the quantity of effective reactive power compensation, this paper gains optimal configuration scheme of reactive power compensation device and verifies the validity and correctness of the proposed method by Power System Analysis Software Package (PSASP)simulation platform.Then, aiming at voltage hard to control because of large and complex structure of modern grid, this paper launched a study on power system partition approach. In this section, by analyzing different partition methods, the paper proposed a module clustering partitioning algorithm based on complex network theory, This method was based on Q module proposed by Newman et, al and made certain improvements which confirmed partition result to maximize module index. To solve the problem of huge computation during module clustering, this paper is combined with the initial partition algorithm of sensitivity, and finally achieved the partition process of "first division, then cohesion ". Through the New England 10generator 39 bus system partition, we obtained the optimal number of partitions.Finally, the paper focused on characteristics of receiving end grid and analyzed the mechanism of transient voltage stability. Taking the example of typical receiving end area-Guan cheng area in Guangdong power grid, this paper analyzed various factors that influenced the transient voltage stability of this area. By configuring dynamic reactive power compensation device based on effective quantity of reactive power compensation and grid partition algorithm, dynamic reactive power partition compensation scheme is gained for Guancheng220kVsubstations. BPA simulation results show that partition compensation can increase using rate of effective reactive power and dynamic reactive power compensation device, and improve the transient voltage stability.The work of this paper is not only of great significance for voltage control in main grid, but also has certain reference value for the future planning and construction of urban power grid and distribution network.