Design method for judging out-of-step separation based on application compensating impedance principle

Abstract

The invention discloses a design method for judging out-of-step separation based on application impedance compensation principle. The design method can automatically obtain the real-time impedance value of the line; use the impedance compensation principle to judge out-of-step separation method according to the real-time impedance value as a line compensating impedance value and automatically identify whether the power system on the two sides of the tie line is in an out-of-step oscillation state, the out-of-step center is on the line, and correspondingly open and lock the implement of the out-of-step separation controlled action, thereby achieving the out-of-step separation control which are safe, reliable and fast action and preventing power system stabilization destruction and large area blackout caused by emergent events.

Description

technical field [0001] The invention relates to an automatic control method in the electric power field, in particular to a design method for judging out-of-step splitting based on the principle of applied compensation impedance. Background technique [0002] With the construction of UHV power grids, the connection between regional power grids has been greatly strengthened, and the stability characteristics have become more complex. It is urgent to study the power grid decoupling control technology in extreme emergencies, including the adaptability research of traditional decoupling criteria, different Coordinated control technology research on cross-section decoupling, research on new criteria for decoupling control, etc. [0003] There are many problems in the splitting control scheme of traditional criterion design. (1) The criteria can only reflect one or several types of out-of-step characteristics, and most of the criteria are not perfect; (2) Most of the criteria are...

AI Technical Summary

Problems solved by technology

The two methods have their own advantages and disadvantages. The former device is simple, reliable, unilaterally judged, does not involve the communication system, and meets the reliability requirements of the third line of defense, but because it involves prior impedance setting, it is not adaptable to grid structure changes. , and in some networks, it is difficult to calculate the precise impedance value; the latter has a strong adaptability to the grid structure because it is calculated in real time to obtain the voltage phasor on both sides of the line, and there is no fixed value that needs to be adjusted, but the device is complicated to implement , needs to be installed on both sides, and has high requirements for synchronous time scale and fast communication system. Once a communication accident or synchronous clock failure accident occurs, the device will be completely withdrawn, which does not meet the reliability requirements of the third line of defense.

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