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Latent series compensation device

A technology of series capacitors and compensation devices, applied in reactive power compensation, reactive power adjustment/elimination/compensation, etc., can solve problems such as generator shaft damage, achieve low steady-state operating loss, improve transient stability, The effect of high reliability

Active Publication Date: 2014-07-23
CHINA EPRI SCIENCE & TECHNOLOGY CO LTD +2
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0005] When a conventional series compensation device is installed in the transmission network, the subsynchronous frequency in the electrical system may complement the natural torsional frequency in the mechanical system, resulting in a subsynchronous resonance (SSR), which will generate an amplified torque, resulting in power generation Damage to the main shaft

Method used

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Embodiment Construction

[0048] The specific embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0049] figure 1 It is a schematic diagram of the main circuit structure of the submersible series compensation device of the present invention, wherein, Line is the circuit where the submersible series compensation device is located; C is a series or parallel capacitor bank; MOV is a metal oxide voltage limiter, which is used to protect the capacitor bank C ; G is the spark gap, which is used to protect the capacitor bank C and MOV; S is the bypass circuit breaker, which is used for the input and exit operation of the submersible series compensation device; D is the damping device. The damping device D is connected in series with the capacitor bank C. When the system is in normal operation, the bypass circuit breaker S is in the closing position, and the damping device D is not connected to the line. The damping device D includes...

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Abstract

The invention belongs to the field of flexible alternating current transmission of power systems, and particularly relates to a latent series compensation device of the power system. The device comprises a capacitor bank, an over-voltage protection device, a damping device and a bypass circuit breaker, wherein the capacitor bank and the damping device are connected in series and then connected in parallel with the over-voltage protection device and the bypass circuit breaker. When the system runs normally, the latent series compensation device is not used, namely the latent series compensation device is in a bypass state; and when short-circuit failures occur, the latent series compensation device detects the short-circuit failures, is used for a circuit in different ways according to different failure types, and is bypassed after a certain time. By the latent series compensation device, the transient state stability of the system is improved, and the voltage distribution of the circuit is optimized; and risks in sub-synchronous resonance (SSR) are eliminated. The latent series compensation device can be used both independently and together with a conventional series compensator.

Description

technical field [0001] The invention belongs to the field of flexible AC power transmission in electric power systems, and in particular relates to a submersible series capacitor compensation device for electric power systems. Background technique [0002] The series capacitor compensation device is to connect the capacitor bank in series in the AC transmission line to compensate part of the inductive impedance of the AC transmission line, so as to achieve the purpose of increasing the transmission capacity of the line, improving the stability of the system, and saving investment. In long-distance, large-capacity transmission systems, with the increase of transmission distance, the transmission capacity of transmission lines is more and more restricted. Series compensation is one of the important means to solve this problem and improve the transmission capacity of transmission lines. It has very huge economic value and has been widely used in power systems around the world. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/18
CPCY02E40/30
Inventor 武守远金雪芬戴朝波石泽京
Owner CHINA EPRI SCIENCE & TECHNOLOGY CO LTD
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