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Feedforward selection method in flexible direct current control circuit and related device

A control circuit, flexible DC technology, applied in the direction of circuit devices, AC network circuits, harmonic reduction devices, etc., to achieve the effects of avoiding drops, improving performance, and avoiding AC resonance

Active Publication Date: 2020-09-25
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] This application provides a feed-forward selection method and related devices in a flexible DC control circuit, which are used to solve the technical problem of suppressing AC resonance and resisting the voltage drop of the AC grid in the existing flexible DC control strategy.

Method used

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  • Feedforward selection method in flexible direct current control circuit and related device
  • Feedforward selection method in flexible direct current control circuit and related device
  • Feedforward selection method in flexible direct current control circuit and related device

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Experimental program
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Embodiment 1

[0042] For ease of understanding, see figure 1 , Embodiment 1 of a feedforward selection method in a flexible DC control circuit provided by the present application, including:

[0043]Step 101. Obtain the grid background harmonic voltage and the voltage modulus variation calculated according to the collected grid voltage.

[0044] It should be noted that the collected grid voltage is mainly to extract its phase information and amplitude, that is, the modulus, and then calculate the variation of the amplitude based on the acquired data; DC equipment is a sensitive voltage, and it is necessary to reduce the influence of harmonic voltage of this frequency on flexible DC equipment during flexible DC operation. Therefore, it is necessary to obtain this voltage data for determination and analysis.

[0045] Step 102. Determine whether the change in voltage modulus exceeds the change threshold. If yes, feed back the preset actual grid voltage as a feedforward value to the current in...

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Abstract

The invention discloses a feedforward selection method in a flexible direct-current control circuit and a related device. The method comprises the following steps: acquiring a power grid background harmonic voltage and a voltage module value variable quantity calculated according to the acquired power grid voltage; and judging whether the voltage module value variation exceeds a variation threshold value, if so, feeding back a preset actual power grid voltage as a feedforward quantity to a current inner loop controller, if not, judging whether the power grid background harmonic voltage exceedsa harmonic threshold value, if yes, feeding back a preset hybrid power grid voltage as the feedforward quantity to the current inner loop controller, and if not, feeding back a preset virtual power grid voltage as the feedforward quantity to the current inner loop controller, wherein the preset hybrid power grid voltage comprises the preset virtual power grid voltage and the preset actual background harmonic voltage. According to the invention, the technical problem of contradiction between AC resonance suppression and AC power grid voltage drop resistance in the existing flexible DC controlstrategy is solved.

Description

technical field [0001] The present application relates to the technical field of flexible DC control, in particular to a feedforward selection method and related devices in a flexible DC control circuit. Background technique [0002] The flexible DC transmission system can independently adjust active power and reactive power, and has superior controllability and flexibility. However, in recent years, the number of flexible DC transmission projects is increasing, and the capacity is also increasing. In the actual operation of flexible DC projects, the problem of resonance between the AC system and the flexible DC transmission system is prone to occur; in order to solve the resonance problem, the main method at present is Reduce the dynamic response speed of flexible DC; but on the other hand, limited to the current technological level of power electronic devices, the overcurrent capability of flexible DC converter valves is limited, especially when the AC grid voltage drops, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36H02J3/01H02J3/12
CPCH02J3/01H02J3/12H02J3/36H02J2003/365Y02E40/40Y02E60/60
Inventor 李岩黄伟煌饶宏许树楷李桂源
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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