AGC emergency control method and AGC emergency control system based on frequency change rate

Abstract

The invention discloses an AGC emergency control method and an AGC emergency control system based on frequency change rate. The method comprises the following steps: monitoring the frequency change rate of the system in real time, judging whether the monitored frequency change rate is greater than a set threshold of a special emergence area, entering the special emergence area and performing next step if the monitored frequency change rate is greater than the set threshold of the special emergence area, and continuing monitoring if the monitored frequency change rate is not greater than the set threshold of the special emergence area; in the special emergence area, calculating the power deficiency of the system according to the frequency change rate of the system measured at the moment of disturbance; and judging whether the difference between the active power deficiency of the system and the standby active power of the system is greater than a set threshold according to the power deficiency of the system, if the difference is greater than the set threshold, starting load shedding, and if the difference is not greater than the set threshold, starting an AGC invocation strategy of the special emergence area, and using an AGC optimal invocation model based on shortest recovery time to allocate the power deficiency of system to AGC units. The method and the system have the advantages of fast frequency recovery and high efficiency, and can be widely used in the field of power control.

Description

technical field [0001] The invention relates to the field of electric power control, in particular to an AGC emergency control method and system based on frequency change rate. Background technique [0002] The rapid increase in the number of DC fed into the receiving end grid and the continuous increase in the power of single-circuit DC transmission make the interaction between AC and DC more complicated. In the event of large disturbances such as tripping of large units and bipolar blocking of large-capacity DC transmission systems, there will be a long-term and large-scale power shortage in the power grid system, which will bring difficulties to the rapid recovery of system frequency. [0003] With the development of grid technology, Automatic Generation Control (AGC) has become the main means of power and frequency control in interconnected grid systems. The AGC control area can be divided into dead zone, normal regulation zone, sub-emergency regulation zone and emergen...

AI Technical Summary

Problems solved by technology

The current AGC control strategy will comprehensively consider various factors such as the medium and long-term stability of the frequency when the power grid suffers from a large disturbance, so that its command adjustment is conservative, resulting in the proportion of ACE (Area Control Error, the abbreviation of area control error) sub-emergency area The coefficient and the gain of the emergency zone are much smaller than the control requirements at the initial stage of the large disturbance, and it cannot guarantee the fastest recovery of the system frequency

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