Abstract
With the large-capacity DC transmission and various types of power electronic equipment widely used in power systems, the voltage stability problem has once again been closely watched. Voltage stability can be divided into static, transient and dynamic stability. The static voltage stability accident, Generally speaking, the grid load is slowly increased, causing the load terminal bus voltage to slowly drop. Near the critical value, any small disturbance will cause an irreversible sudden drop in the load bus voltage, this is a voltage collapse. The article first analyzes the static voltage stability margin index and related technical standards. Comparative analysis of several static voltage stability margin calculation methods. Second, take the planning grid of a very large city as an example. Using PSS/E software to simulate the static voltage stability margin of the system under various conditions. Analysis of the static voltage stability margin characteristics of the urban power grid. And the reactive power compensation optimization scheme is proposed for the weak voltage link.
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