Capacitor energy control method with short-term frequency support and direct-current side oscillation suppression functions

An energy control and frequency support technology, applied in the direction of reducing/preventing power oscillation, AC network circuits, circuit devices, etc., can solve the problem of MMC capacitor energy not fully participating in synchronous oscillation, etc., to avoid severe voltage fluctuations and damping voltage oscillations. Effect
CN113193569AActive Publication Date: 2021-07-30ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
Publication Date
2021-07-30

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Abstract

The invention provides a capacitor energy control method with short-term frequency support and direct-current side oscillation suppression functions. The capacitor energy control method comprises the following steps: obtaining a reference power instruction correction delta(Wc1) of capacitor energy control based on alternating-current side frequency deviation control; obtaining the direct-current side correction delta(Wc2) through direct-current side virtual capacitor energy control; correcting the steady-state power of the MMC capacitor energy to obtain a reference power instruction for capacitor energy control, so that the MMC capacitor energy responds according to the frequency fluctuation of an alternating current side and the voltage of a direct current bus and participates in absorption of oscillation energy. The control method directly absorbs energy from an MMC capacitor, the response to the frequency of the alternating current side and the oscillation of the direct current side is rapid, and the control accuracy is high. The method can have the functions of short-term frequency support and direct current side oscillation suppression, and gives full play to the advantages of MMC capacitor energy damping control.
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Description

technical field

[0001] The invention belongs to the technical field of power grid oscillation control, in particular to a capacitive energy control method with short-term frequency support and DC side oscillation suppression, in particular to a capacitive energy control method with short-term frequency support and DC side oscillation suppression functions. Background technique

[0002] In the interaction between the converter and external circuits such as wind turbines and weak power grids, inappropriate setting of controller parameters, excessive output power of the converter, and too weak power grid will cause the impedance mismatch between the converter and the external circuit, resulting in Subsynchronous oscillation occurs on the AC side or DC side, which affects the safe and stable operation of the power grid.

[0003] At present, the methods for suppressing subsynchronous oscillation on the AC side of the converter include: adding series virtual resistors to the MMC A...

Claims

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