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Flexible DC additional control method for suppressing subsynchronous oscillation

A sub-synchronous oscillation and additional control technology, applied in the direction of reducing/preventing power oscillation, power transmission AC network, etc., can solve the problem of limited sub-synchronous oscillation suppression effect, achieve fast response, strong versatility, and easy access

Inactive Publication Date: 2017-03-15
BEIJING SIFANG JIBAO AUTOMATION
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] At present, the additional excitation damping control has a good suppression effect in suppressing small disturbances in the power grid, but has limited suppression effect on subsynchronous oscillations caused by large disturbances

Method used

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  • Flexible DC additional control method for suppressing subsynchronous oscillation
  • Flexible DC additional control method for suppressing subsynchronous oscillation
  • Flexible DC additional control method for suppressing subsynchronous oscillation

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Embodiment Construction

[0038] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the technical solutions of the present invention will be further elaborated below in conjunction with specific embodiments.

[0039] figure 1 Shown is a schematic diagram of the flexible DC topology and the DC damping additional control wiring to suppress subsynchronization. The side of the DC rectification station includes N sets of thermal power generators from G1 to GN that may generate subsynchronous oscillations. The distance between each unit and the commutation bus on the rectification side is represented by LineN. The voltage transformer on the side of the DC rectifier station will measure the AC voltage u of the commutation busbar abcSend it to the flexible DC sub-synchronous damping controller, and add the generated control output signal to the flexible DC controller.

[0040] The flexible DC additional control method for suppressi...

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Abstract

The invention discloses a flexible DC additional control method for suppressing subsynchronous oscillation. The flexible DC additional control method comprises the following steps of (1) detecting AC bus voltage of a rectifier side and extracting subsynchronous information; (2) selecting a broadband-pass single-channel DC additional damping controller; (3) superposing an output current signal of the controller and inner-loop d-axis control current in a flexible DC controller to obtain a control signal for controlling a flexible DC transmission converter valve; (4) adding a low-frequency filter to a DC voltage feedback link of a DC outer-loop voltage controller and filtering out a low-frequency component, caused by subsynchronous oscillation, in DC voltage; and (5) generating a trigger pulse from the control signal of the flexible DC converter valve through a modulation link and finally providing additional electromagnetic torque to suppress the subsynchronous oscillation. According to the method, damping of oscillation frequencies of all subsynchronous oscillation bands can be achieved, the method is not limited by a rectifier side control strategy and can be easily realized in a project, and the subsynchronous stability of a system can be improved.

Description

technical field [0001] The invention relates to a flexible DC additional control method for suppressing subsynchronous oscillation, and belongs to the technical field of subsynchronous oscillation (Subsynchronous Oscillation, SSO) suppression. Background technique [0002] Power System Subsynchronous Power System Subsynchronous Oscillation (SSO) is a very serious power grid stability problem. The SSO first appeared in the AC transmission system with series compensation capacitors, and then the SSO caused by the High Voltage Direct Current (HVDC) line was discovered. The generator set near the rectifier station of the conventional HVDC transmission system may interact with the HVDC control system torsional vibration, causing SSO problems. The torsional vibration of the shafting of the turbo-generator set induced by SSO will cause fatigue damage to the shafting of the generator set. In severe cases, the strong torsional vibration during the transient process can even lead to ...

Claims

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Application Information

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IPC IPC(8): H02J3/24H02J3/36
CPCY02E60/60H02J3/24H02J3/36
Inventor 孙刚时伯年常富杰梅红明徐刚刘志超
Owner BEIJING SIFANG JIBAO AUTOMATION
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