Abstract
To solve on-line practicability problem in transient stability assessment (TSA) and preventive control, a method for on-line TSA and preventive control is presented using static information. We first analyze the correlation between static information of power grid operation and transient stability and propose an on-line TSA algorithm based on dominant instability generator group (DIGG). Later, the quasi-linear relationship between critical clearing time (CCT) and active power of DIGG has been conducted. Thus, for dangerous operation modes, adjusting active power of DIGG can reach a new stable operation point whose CCT is adequately large to avoid power grid instability. One this basis, another algorithm of readjusting generator active power is suggested. This method can quickly and precisely assess the stability of power grid and offer adjustment scheme for power grid operators. The effectiveness and reasonability of the method is verified on IEEE 39 and CSG power grid systems.
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