Tracking and computing method of Thevenin equivalent of full-dynamic process power system

Abstract

The invention relates to a tracking and computing method of Thevenin equivalent of a full-dynamic process power system and belongs to the field of power system automation. In order to solve the problem that the traditional computing method of Thevenin equivalent can only compute equivalent parameters of steady-state process of the power system, and cannot compute equivalent parameters of the power system during the failure of the power system and transient process after the failure is solved. The method comprises the following steps of: using the equivalent parameters before failure to compute amplitude of equivalent voltage source when the failure occurs; taking the resistive component of the equivalent system impedance before failure and equivalent voltage source amplitude when the failure occurs as original values, computing other Thevenin equivalent parameters when the failure occurs; and finally, using the method to compute equivalent parameters of the power system when the failure is removed so as to obtain Thevenin equivalent parameters of the power system at each time after the failure is removed. The method can compute equivalent parameters during the full-dynamic transient state and medium and long-term process of the power system, and has small computing error.

Description

technical field [0001] The invention relates to the field of power systems, in particular to a method for tracking and calculating the Thevenin equivalent of a full dynamic process power system. Background technique [0002] The Thevenin equivalent is one of the core algorithms for power system security and stability assessment. Therefore, the real-time solution of the Thevenin equivalent parameters has become a research hotspot in recent years. There are three main algorithms: 1. The Thevenin is derived from the power flow equation. The analytical formula for the equivalent parameters, using the data of the operating point and its neighboring points to solve the Thevenin equivalent parameters. This method is suitable for the situation where the Thevenin equivalent system at the two operating points remains unchanged and only the load on the bus side of the load changes. For the internal change in the equivalent system, the equation assumes that the Thevenin equivalent param...

AI Technical Summary

Problems solved by technology

But its shortcomings mainly include: in practical application, the network information of the whole system is needed in the calculation process, which increases the complexity and amount of calculation, and is not suitable for online calculation; it needs to be transient at each calculation moment The system admittance matrix generated by the stabilization program is corrected, which increases the amount of calculation

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