Active and passive frequency response switching control method

Abstract

The invention relates to the field of electric power technology, in particular to an active-passive frequency response switching control method, in particular to a frequency response control method under a large power loss fault. The present invention includes: for a two-area power grid, use solid straight lines to represent inter-area contact lines, dotted lines to represent communication lines, area A is a disturbance area, and area B is a non-disturbance area: first, establish a unit thermal power unit mathematical model, second, Establish a mathematical model of the interconnected grid. The invention realizes the transformation of frequency response from decentralized autonomous control to centralized coordinated control, from feedback control to feedforward control, and from correction control to preventive control, and can improve the overall frequency response capability of the system without increasing frequency response facilities. In this way, the frequency stability resistance capability under large disturbances is improved. Effectively intercept the frequency drop during the frequency drop stage under large disturbances to avoid low-frequency load shedding of the system, and restore the system to stability as soon as possible during the frequency recovery stage to avoid frequency oscillation during the active control process of the system.

Description

technical field [0001] The present invention relates to the field of electric power technology, in particular to an active and passive frequency response switching control method, in particular to a frequency response control method under a large power loss fault. Background technique [0002] The gradual advancement of UHV power transmission projects has led to a continuous increase in the number of power imbalances caused by single component failures, and the large-scale access of renewable energy has led to a continuous decrease in the proportion of conventional unit capacity. According to analysis needs, frequency response theory should be refined and keep pace with the times. [0003] The normal operation of the power grid takes eliminating the local frequency difference as the control goal, mainly from two aspects of prevention and correction. In order to ensure the operation safety and quality of the entire power grid, the frequency response is set as a cross-regiona...

AI Technical Summary

Problems solved by technology

[0005] In view of the fact that the system's frequency response capability declines in the absence of high power, it is necessary to propose a control strategy on the basis of the existing frequency response facilities to effectively intercept the system frequency during the rapid decline stage, so as to avoid low-frequency load shedding and enhance The ability of the system to resist risks

Images