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Method for processing alternating current system failures in alternating current and direct current electric transmission line

A technology of AC system and transmission line, applied in the direction of AC and DC network circuit layout, DC network circuit device, circuit device, etc., to achieve the effect of reducing the amount of machine cutting, increasing or reducing transmission power, and improving overall economic benefits

Active Publication Date: 2014-02-05
NR ELECTRIC CO LTD +3
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  • Abstract
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  • Application Information

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Problems solved by technology

[0006] China Invention Application No. 201210444402.1 "Grid Optimization Method Adapting to DC Emergency Power Support", this method mainly analyzes the problem of grid structure optimization from the perspective of using multiple DC emergency power supports, and the impact of DC emergency power control on AC system failures Questions about impact are not addressed

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  • Method for processing alternating current system failures in alternating current and direct current electric transmission line
  • Method for processing alternating current system failures in alternating current and direct current electric transmission line
  • Method for processing alternating current system failures in alternating current and direct current electric transmission line

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Embodiment Construction

[0039] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0040] Such as figure 1 As shown, the present invention provides a processing method for AC system faults in AC-DC transmission lines, including the following steps:

[0041] (1) Obtain the actual operation data of the power grid, including the data of the stability control station, load shedding execution station, machine cut execution station, etc.;

[0042] (2) Obtain the real-time transmission power value of the DC line, and according to the overload capacity of the DC design, determine the power value that the DC system can instantly increase or decrease, and design the transfer function of the DC emergency power control; image 3 As shown, the line input power can choose the line of the transmission section as the input, and then output the modulated active power after passing through the inertial link, filtering link, DC blocking li...

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Abstract

The invention discloses a method for processing alternating current system failures in an alternating current and direct current electric transmission line. The method comprises the steps of obtaining actual operation data of a power grid; according to overload capacity designed for direct currents, confirming power value, capable of being instantly increased or reduced, of a direct current system, and designing the transmission function controlled by direct current emergency power; obtaining the generator tripping value needed when the direct current emergency power is adopted to control conditions under failures of an alternating current system through an offline computing mode, pushing out action effect of the direct current emergency power control on the alternating current system failures, and making an offline control strategy; when the alternating current system failures occur, judging whether to adopt the direct current emergency power control according to the strategy, and safely and stably controlling the device to adopt generator tripping or load tripping measures according to the strategy. According to the method, the direct current emergency power control and the safe and stable control strategy are combined, a direct current emergency power control method is adopted to reduce total generator tripping value after the alternating current system failures occur, and overall economic benefits of power grid operation is improved.

Description

technical field [0001] The invention belongs to the field of power system operation control, and in particular relates to the coordination problem of safety and stability control of power transmission of an AC / DC hybrid system and DC emergency power control. Background technique [0002] High-voltage, long-distance DC transmission technology is an effective way to solve the contradiction between primary energy and load distribution in my country. In the next few years, my country will build a series of ultra-high voltage and ultra-high voltage DC transmission projects on a large scale to alleviate the contradiction between power supply and demand. The AC / DC hybrid transmission system will exist in the grid structure of many provinces and regions in my country. [0003] Under the adjustment of the control system, the direct current transmission system has the ability to quickly adjust the active power. Making full use of this function can improve the transient stability level ...

Claims

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Application Information

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IPC IPC(8): H02J4/00H02J1/00
Inventor 付俊波王新宝夏彦辉刘开俊李晖王帅
Owner NR ELECTRIC CO LTD
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