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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

Active Publication Date: 2021-07-30
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing technology, the total capacitance energy of MMC is generally not modulated, and there is a problem that the capacitance energy of MMC does not fully participate in the short-term frequency support of the AC side and damping the subsynchronous oscillation of the DC power grid.

Method used

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

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Embodiment Construction

[0030] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0031] The present invention provides a capacitive energy control method with short-term frequency support and DC side oscillation suppression functions, which is applied in a multi-terminal DC power grid system, such as figure 1 As shown, the multi-terminal DC grid system is figure 1 It is a four-terminal DC grid system. The four-terminal DC grid system includes a first terminal 1 , a second terminal 2 , a third terminal 3 and a fourth terminal 4 . The first end 1 and the second end 2 are connected by a first cable 5, the first end 1 and the third end 3 are connected by a second cable 6, and the second end 2 and the fourth end 4 are connected by a third The cables 7 are connected, and the third end 3 and the fourth end 4 are connected through a fourth cable 8 . The first end 1 includes an AC system, a DC bus element, and a converter MMC1 arranged b...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24H02J3/36
CPCH02J3/241H02J3/36Y02E60/60
Inventor 周挺辉赵利刚秦亮杨诗琦朱蜀刘开培
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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