Automatic tracking method of operating capacity of magnetically controlled shunt reactor based on parameter identification

Abstract

The invention discloses a parameter identification-based automatic tracking method for the operating capacity of a magnetic control shunt reactor. The capacity change of the reactor is analyzed and determined through the identification of the impedance parameter of the reactor, the real-time operating capacity of the reactor is computed, when the capacity change of the reactor exceeds a certain threshold, a protection starting element serves as a correcting algorithm blocking element, and only when protection is not started and the reactor is stably operated, a protection setting value can be corrected. The method can ensure the protection sensitivity in real time, avoids the occurrence of protection operation resistance and maloperation of the reactor when the operating condition of the reactor is changed, and guarantees the protection sensitivity and reliability.

Description

technical field [0001] The invention relates to an automatic tracking method for the operating capacity of a magnetically controlled shunt reactor based on parameter identification, and belongs to the technical field of reactor protection. Background technique [0002] Shunt reactors have the function of limiting overvoltage and reactive power compensation. Shunt reactors include fixed-capacity reactors, graded controllable reactors and magnetically controlled shunt reactors. The capacity of fixed-capacity reactors is not adjustable, and graded controllable reactors The capacity is adjustable but the capacity cannot be adjusted continuously. The magnetically controlled shunt reactor can make up for the shortage of the former. Its capacity can be adjusted continuously, and the capacity can be adjusted from 5% to 100%. Therefore, it is mostly used in UHV systems. Therefore, the shunt reactor The stable operation of the reactor is very important, and there are also high require...

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Problems solved by technology

[0002] Shunt reactors have the function of limiting overvoltage and reactive power compensation. Shunt reactors include fixed-capacity reactors, graded controllable reactors and magnetically controlled shunt reactors. The capacity of fixed-capacity reactors is not adjustable, and graded controllable reactors The capacity is adjustable but the capacity cannot be adjusted continuously. The magnetically controlled shunt reactor can make up for the shortage of the former. Its capacity can be adjusted continuously, and the capacity can be adjusted from 5% to 100%. Therefore, it is mostly used in UHV systems. Therefore, the shunt reactor The stable operation of the reactor is very important, and there are also high requirements for the reliability of its protection. However, at present, the differential protection and overcurrent backup protection as the main protection of the reactor are fixed and cannot be adjusted, and they are all based on the rated current. And the rated current is fixed, but due to the particularity of the work of the magnetic control reactor, its capacity is adjustable and the working range is large. When the capacity changes greatly, the rated current range is large. If the constant rated current before the change is still used Calculation of the fixed value will lead to protection refusal or malfunction, causing the reactor to fail to work normally, and in severe cases, it will affect the safe and stable operation of the entire power system

[0003] The reactor protection device currently used in the project cannot recognize the change of the working condition of the reactor, and there is no algorithm that can adaptively and automatically track the change of the operating capacity of the reactor and correct the protection in real time

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