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With the expansion of the scale of the grid, voltage stability problems are becoming increasingly prominent, people began to invest more and more research on voltage stability. Voltage power system safe and stable operation of the important parameters, but also the characterization of the power quality is an important indicator. The development of the power system, expansion of the network coverage area, the transmission distance extension of the grid voltage, the dispersion of the more serious in space; modern power system load fluctuations are very severe, exacerbated by the grid voltage on the time dispersion. Coupled with changes in load characteristics, the widespread use of the on-load tap result in grid load reactive deterioration of the characteristics of the load reactive power and voltage adjustment coefficient decreases, in the case of heavy-duty, interference can easily lead to the collapse of the power grid voltage. Power system voltage stability is an important aspect of the study of power system stability, power system voltage instability is a local phenomenon, the local voltage instability, however, may be a chain reaction, causing the entire system to voltage collapse, especially in recent years around the world lead to the destruction of the voltage stability of power system collapse accidents has increased, the harm caused is enormous, so that the power workers voltage stability problems risen to a new level. Kwong On the territory of the grid is just a 220kV on behalf of the City substation, the substation is the main power grid in Guang'an, this region due to a single power point, a lower level of power system stability, voltage quality is difficult to guarantee. However, the Guang'an reactive power compensation device for shunt capacitor, the capacitor poor reactive power - voltage characteristics, it is difficult to prevent the rapid drop in voltage due to voltage collapse. The risk of damage in the case of a rapidly growing load large potential interference voltage stability. In this paper, the specific circumstances of the grid in Guang'an Guang'an grid interference voltage stability in-depth analysis and calculation, on this basis, propose appropriate measures to ensure the security and reliable operation, and as a network planning basis. In this paper, analysis and research on the following issues: (1) analysis of power system generator reactive power compensation device and load reactive power and voltage characteristics, as well as the principle of the power system voltage stability; (2) analysis of Guang'an grid power grid in 2010, On this basis, development of an analytical the Guang'an grid large interference voltage stability of mathematical models; (3) through a different set of interference, the use of numerical simulation of Guang'an grid interference voltage stability analysis; ④ According to the simulation results, the proposed improve the the Guang'an power grid interference voltage stability measures.
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