Active and passive frequency response switching control method

Abstract

The invention relates to the technical field of electric power, particularly relates to an active and passive frequency response switching control method, and specifically a frequency response controlmethod in a high-power deficiency fault. According to the method, for a two-regional power grid, a number line is adopted for representing an inter-region call wire, and an imaginary line is adoptedfor representing a communication line; A region is a disturbed region and a B region is a non-disturbed region; firstly, a unit thermal power generating unit mathematical model is established; and 2,an interconnected power grid mathematical model is established. By adoption of the method, frequency response is changed from dispersed autonomous control into concentrated coordination control, fromfeedback control into feedforward control, and from correction control to preventive control, and the overall frequency responsiveness of the system is improved under the premise of not increasing frequency response facility, thereby improving frequency stability defense capability under high disturbance; and frequency decline can be stopped effectively in a high disturbance frequency decline stage, system low frequency load shedding can be avoided, the system can be recovered to be stable in a frequency recovery stage as soon as possible, and frequency oscillation in the active control process of the system can be avoided.

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...

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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

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