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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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.
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