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Control method for restraining secondary arc current of controllable series compensation circuit

A control method and technology for submerged current supply, which are applied in the direction of emergency protection circuit devices, electrical components, circuit devices, etc. for limiting overcurrent/overvoltage, so as to achieve reduced transient components, good reliability and economy, and shortened The effect of extinguishing time

Active Publication Date: 2012-10-03
CHINA ELECTRIC POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The closing time of the series compensated bypass switch is about 50ms, and there is a certain probability of refusal

Method used

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  • Control method for restraining secondary arc current of controllable series compensation circuit
  • Control method for restraining secondary arc current of controllable series compensation circuit
  • Control method for restraining secondary arc current of controllable series compensation circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] For a typical 750kV line with 50% controllable series compensation, when a single-phase ground fault occurs on the line and the controllable series compensation is not bypassed, the latent supply current waveforms are shown in Figure 6(a) and Figure 6(b) As shown in the figure, it can be seen from the figure that when the series compensation capacitor is not bypassed, the decay of the sneak supply current is relatively slow. After the circuit breaker trips for 0.5s, the effective value of the submerged supply current is about 22A. In addition, there is a low-frequency oscillation component with a frequency of about 5 Hz in the latent supply current waveform. The existence of the low-frequency transient component reduces the number of zero-crossings of the submerged power supply current, which is also unfavorable to the self-extinguishing of the submerged power supply arc.

Embodiment 2

[0067] A typical 750kV line with 50% controllable series compensation, the submerged supply current waveform after taking the measure of commanding the controllable series compensation to enter the bypass mode when a fault occurs. Its pre-supply current is shown in Figure 7(a) and Figure 7(b). It can be seen from the figure that after adopting this countermeasure, the low-frequency oscillation component in the submerged supply current attenuates quickly, which is beneficial to the submerged supply current. zero crossing. After the circuit breaker trips for 0.5s, the effective value of the sneak supply current is about 17A, which is lower than the sneak supply current with series compensation and no measures are taken in case of failure.

[0068] The thyristor in the controllable series compensation has fast action capability, and its action time is on the order of μs. Therefore, when a fault occurs in the system, the anti-parallel thyristor and the bypass switch are commanded...

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Abstract

The invention relates to a control method of controllable series compensation, and particularly relates to a control method for restraining secondary arc current of a controllable series compensation circuit. The method comprises the steps of: generating a single-phase earth fault on a circuit with controllable series compensation; detecting fault current, emitting a signal to a controllable series compensation control system, facilitating the controllable series compensation entering into a thyristor bypass mode; separating a brake of a fault phase circuit breaker, automatically extinguishing the secondary arc current after lasting a period of time; controlling the fault phase circuit breaker to switch on again by a circuit protection system; removing the single-phase earth fault, and restoring an operating capacitive reactance regulation mode According to the method, when the controllable series compensation circuit generates the single-phase earth fault, the controllable series compensation can enter into the thyristor bypass mode through a protection linkage command, so the transient component of the secondary arc current can be reduced, and the extinguishing time of the secondary arc current is shortened; and a thyristor and a bypass switch are simultaneously ordered to act in the fault, so protective redundancy can be increased and the reliability of protective measures can be enhanced.

Description

technical field [0001] The invention relates to a control method for controllable series compensation, in particular to a control method for suppressing the submerged current of a line with controllable series compensation. Background technique [0002] In EHV and UHV systems, in order to improve the reliability of power supply, fast single-phase automatic reclosing is often used. However, when one phase of the system is cut off due to a single-phase ground fault, due to the coupling effect of mutual inductance and capacitance between phases, the cut off fault phase still flows a certain value of ground current at the fault point, which is the sneak supply current. The current appears in the form of an arc, also known as a submerged arc. When the arc is extinguished instantly, due to the coupling effect between phases, a recovery voltage appears in the arc gap, which increases the difficulty of automatic arc extinguishing at the fault point, and may cause automatic reclosin...

Claims

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Application Information

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IPC IPC(8): H02H7/26H02H9/08
Inventor 杜宁孙强项祖涛尚勇班连庚魏磊宋瑞华刘娟楠周佩朋韩亚楠郑彬
Owner CHINA ELECTRIC POWER RES INST
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