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Method for fast eliminating power system ferroresonance

A ferromagnetic resonance and power system technology, applied in the direction of reducing/preventing power oscillation

Inactive Publication Date: 2013-07-10
王少夫
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are few reports on the method of ferromagnetic detuning

Method used

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  • Method for fast eliminating power system ferroresonance
  • Method for fast eliminating power system ferroresonance
  • Method for fast eliminating power system ferroresonance

Examples

Experimental program
Comparison scheme
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Embodiment

[0027] The actual ferromagnetic resonant circuit in the power system can be analyzed as a single-phase ferromagnetic resonant circuit, assuming that the current flowing through the transformer inductance is , is the transformer flux linkage, then the excitation characteristic is expressed by a seventh-order equation as follows:

[0028] (1)

[0029] After the circuit model is normalized, the system differential equation is:

[0030]

[0031] (2)

[0032] In the formula

[0033] (3)

[0034] in, is the supply voltage; is the equalizing capacitor; is the equivalent ground capacitance of the system; is the exciting inductance; is the core loss.

[0035] when parameter When , the system...

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Abstract

Power system ferroresonance is a nonlinearity electromagnetic phenomenon. Ferroresonance can be simulated by change of operation methods of a power system and operation of system equipment. Long-time overvoltage and overcurrent produced by the ferroresonance threaten the safety of the power system greatly. The method for fast eliminating the power system ferroresonance comprises a first step of giving a model of providing one-phase ferroresonance equivalent linear timevariant and a state equation of an equivalent circuit according to a transformer substation wiring diagram of the ferroresonance, and a second step of eliminating the one-phase ferromagnetic resonance phenomena by utilizing of a simplest controller, and a third step of verifying correctness of a conclusion through experiments.

Description

technical field [0001] The invention relates to a method for quickly eliminating ferromagnetic resonance in a power system, belonging to the field of electrical engineering. Background technique [0002] Ferroresonance is a nonlinear electromagnetic phenomenon. in greater than In a power system where the neutral point of the voltage level is effectively grounded, due to the change of the operation mode or the self-tripping of the circuit breaker, the voltage sharing capacitor of the circuit breaker, the line-to-ground capacitance, etc., and the voltage transformer grounded at the neutral point will be in a certain area A resonant circuit is formed inside, causing ferromagnetic resonance overvoltage. Due to the saturation of the iron core of the electromagnetic voltage transformer, when the system parameters meet specific conditions, a resonant overvoltage will be generated at both ends of the transformer, and it will exist for a long time, which will give power system safe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24
Inventor 不公告发明人
Owner 王少夫
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