Multi-frequency system out-of-step oscillation center location and displacement path tracking system and method

Abstract

The invention discloses a multi-frequency system out-of-step oscillation center location and displacement path tracking system and method belonging to the technical field of power system stability analysis. The tracking system includes a data acquisition module, an out-of-step / oscillation center positioning module, an oscillation center displacement path tracking module and a result output module sequentially connected. The tracking method comprises the following steps: collecting network structure parameters, generator power angle and speed; regarding each node as an equivalent virtual machine according to the parameters collected by the data acquisition module, wherein the equivalent virtual machine is an equivalent two-machine system for each line, identifying and locating the out-of-step / oscillation center; tracking and analyzing the oscillation center displacement path in the case of unit out-of-step; outputting the multi-frequency out-of-step / oscillation center position and oscillation center displacement path. The correctness and validity of the method criterion and displacement path tracking are verified by a real-time digital simulation platform.

Description

technical field [0001] The invention belongs to the technical field of power system stability analysis. In particular, it relates to a multi-frequency system out-of-step oscillation center positioning and displacement path tracking system and method. Background technique [0002] With the continuous increase of the scale and complexity of the interconnected grid, the issue of power system stability has become increasingly prominent. The operation practice shows that no matter how the stabilization measures are perfected, it is always possible to cause stability damage due to some unexpected accidental factors. The system stability damage is mainly manifested as the potential difference and power angle difference between the synchronous motors change with time to lose synchronization. This phenomenon is called out-of-step oscillation. After the system is out of step and oscillates, if effective measures are not taken to control it, the system will lose control and cause a p...

AI Technical Summary

Problems solved by technology

However, these studies on the oscillation center are mostly based on the equivalent two-machine system model, which cannot meet the needs of today's complex interconnected power systems

In a complex power system, the position of the oscillation center will migrate in the system, seriously endangering the safe and stable operation of the power grid

However, there are few reports on the location of the oscillation center and the displacement path of the out-of-synchronization of the cluster and the multi-frequency oscillation.

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