Delay measurement method, device and system for direct current transmission system

A technology of direct current transmission system and measurement method, which is applied in the direction of measuring devices, measuring electricity, and measuring electrical variables, etc., can solve problems such as system outage and damage to user equipment, and achieve the effect of reducing difficulty and delay error

Active Publication Date: 2021-08-27
NR ELECTRIC CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Yin Congqi, Xie Xiaorong et al.'s "Analysis and Control Method Overview of Flexible DC Transmission System Oscillations" mentioned many flexible DC system oscillation phenomena at home and abroad, especially a converter station in the Zhoushan five-terminal DC transmission project. During the operation of the island, high-frequency component trips occurred, which damaged user equipment; when the flexible DC converter station at one end of the Luxi DC Project was connected to the AC grid through a weak grid, high-frequency oscillations of about 1.2kHz occurred, causing system outage

Method used

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  • Delay measurement method, device and system for direct current transmission system
  • Delay measurement method, device and system for direct current transmission system
  • Delay measurement method, device and system for direct current transmission system

Examples

Experimental program
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Effect test

Embodiment 1

[0036] A delay measurement method for a direct current transmission system, which divides the delay of the entire link of the direct current transmission system into four parts: IO interface link delay, pole control link delay, valve control link delay, sub-module Perform link delay; each part of the link delay starts from the time it receives a signal and ends when it sends the signal to the lower-level system;

[0037] The delay test signal is a periodic sine wave or square wave signal, the signal contains a zero-crossing point, and the signal amplitude and period can be adjusted;

[0038] The delay measurement signal is connected to the link to be tested of the direct current transmission system; the connected delay test signal is an electrical signal or an optical signal; the terminal signal of the link to be tested undergoes photoelectric conversion to convert the optical signal into an electrical signal; The delay of the link to be tested is calculated according to the d...

Embodiment 2

[0047] Delay measurement is performed on the whole of the DC transmission system, that is, the measurement figure 1 In the t15 time, the measurement method specifically includes the following steps:

[0048] Step 1: Connect the delay measurement signal to the link to be tested of the DC transmission system. In this embodiment, the electrical signal of the delay measurement signal is added at the terminal of the IO device. In this embodiment, the delay measurement signal adopts a sine wave. The measurement point is t1.

[0049] Step 2: The extreme control system synchronously processes the sine wave into a square wave, and sends it to the valve control system as a reference wave; the conversion function of synchronously processing the sine wave into a square wave is as follows:

[0050]

[0051] In the formula, ε is the deviation value, which is a non-negative rational number, x[n] is the value of the current cycle delay test signal, x[n-1] is the value of the previous cycl...

Embodiment 3

[0059] Delay measurement of the valve control link of the direct current transmission system, that is, measurement figure 1 In the t34 time, the measurement method specifically includes the following steps:

[0060] Step 1: Connect the delay measurement signal to the link to be tested in the DC transmission system. In this embodiment, the optical signal of the square wave reference wave signal is input into the valve control system, and the measuring point is at t3; in this embodiment The square wave reference wave signal can be generated by an external delay measurement device or directly by a level control device.

[0061] Step 2: The valve control system generates a modulation signal according to the reference wave, and sends it to the sub-module, and the measuring point is at t4.

[0062] Step 3: The terminal signal of the link to be tested, that is, the signal at the measurement point t4, is converted into an electrical signal through photoelectric conversion.

[0063] ...

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Abstract

The invention discloses a delay measurement method, device and system of a direct current transmission system. According to the topology of the direct current transmission system, the delay of the entire link is divided into four parts: IO interface link delay, pole control link Delay, valve control link delay, sub-module execution link delay. The delay of each part of the link can be tested independently from the time it receives the signal to the time it sends the signal to the lower system. The start and end signals of the delay test are connected to the delay measurement device to ensure the measurement consistency. Through the test of the overall and partial link delay of the DC transmission system, it plays a vital role in the optimization of the subsequent delay and the compensation of the control.

Description

technical field [0001] The invention relates to the technical field of direct current transmission in electric power systems, in particular to a delay measurement method, device and system for a direct current transmission system. Background technique [0002] DC transmission systems have been widely used in long-distance power transmission projects such as west-to-east power transmission. With the development of flexible DC transmission technology, flexible DC transmission systems are increasingly used for new energy grid connection, urban power supply, and island power supply. , grid interconnection and other occasions. With the domestic and foreign direct current transmission system projects being put into use, the stability problems caused by converters have gradually become prominent, and the reports of different types of oscillation phenomena are also increasing. Yin Congqi, Xie Xiaorong et al.'s "Analysis and Control Method Overview of Flexible DC Transmission System...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00
CPCG01R31/00
Inventor 王柯卢宇董云龙李钢胡兆庆随顺科周谷庆姜崇学
Owner NR ELECTRIC CO LTD
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