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Direct-current send-out power-grid ultra-low frequency oscillation restraining method and system thereof

An ultra-low frequency and power grid technology, applied in the direction of reducing/preventing power oscillation, etc., can solve the problems of FLC powerlessness, etc., and achieve the effect of simple control method and strong robustness

Active Publication Date: 2017-11-07
BEIJING SIFANG JIBAO AUTOMATION
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Problems solved by technology

[0006] The present invention provides a method and system for suppressing ultra-low frequency oscillation of the DC output power grid, to at least solve the limitation that the existing power grid operators can only sacrifice the frequency modulation capability of the power grid by modifying the parameters of the turbine governor, and at the same time overcome the limitation when the ultra-low frequency oscillation amplitude is less than Insufficiency of FLC powerlessness after control dead zone of DC FLC

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  • Direct-current send-out power-grid ultra-low frequency oscillation restraining method and system thereof
  • Direct-current send-out power-grid ultra-low frequency oscillation restraining method and system thereof
  • Direct-current send-out power-grid ultra-low frequency oscillation restraining method and system thereof

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[0034] In order to enable those skilled in the art to better understand the scheme of the present invention, the planning scheme in the embodiment of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the present invention. Obviously, the described embodiment is only It is the centralized control embodiment of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0035] According to an embodiment of the present invention, an embodiment of a method for suppressing ultra-low frequency oscillation of a DC output power grid is provided.

[0036] figure 1 It is a flow chart of the method for suppressing ultra-low frequency oscillation of the DC output power grid according to the present...

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Abstract

The invention discloses a direct-current send-out power-grid ultra-low frequency oscillation restraining method and a system thereof. The method comprises the following steps that low-pass filtering is performed on collected frequency signals; after oscillation generated by a power grid satisfies a preset ultra-low frequency oscillation criterion, according to a frequency deviation signal, a control signal is generated; and a direct current valve control system adjusts direct current output power according to the control signal and increases system positive damping so as to reach a purpose of restraining ultra-low frequency oscillation. In the invention, disadvantages generated in the condition that a direct current frequency limit controller (FLC) and power grid operation personnel modify a water turbine speed regulator parameter so as to restrain the ultra-low frequency oscillation are overcome.

Description

technical field [0001] The invention relates to the field of power system stability control, and relates to a method and system for suppressing ultra-low frequency oscillation of a direct current transmission power grid. Background technique [0002] Due to the fast controllability of DC, this characteristic can be used to suppress ultra-low frequency oscillation in the DC output grid. Taking the DC transmission grid with a relatively high proportion of hydropower as an example, the prominent negative damping effect of the hydro turbine can easily lead to ultra-low frequency oscillation (oscillation frequency less than 0.1Hz) in the system under certain faults (short circuit fault, DC power boost, etc.). It is difficult to identify the oscillation source of the oscillation one by one, and the oscillation energy cannot be accurately calculated. [0003] Although the DC frequency limit controller (hereinafter referred to as FLC) has a certain inhibitory effect on ultra-low fr...

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Application Information

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IPC IPC(8): H02J3/24
CPCH02J3/24Y02E60/00
Inventor 高鸿飞时伯年孙晓彦陈志民徐刚
Owner BEIJING SIFANG JIBAO AUTOMATION
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