Pilot Protection for High Voltage Direct Current Transmission Line Based on Polarity Characteristics of Converter Control Signal Deviation

doi:10.7652/xjtuxb202105016

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Pilot Protection for High Voltage Direct Current Transmission Line Based on Polarity Characteristics of Converter Control Signal Deviation

更新时间：2025-07-09

- Pilot Protection for High Voltage Direct Current Transmission Line Based on Polarity Characteristics of Converter Control Signal Deviation
- Vol. 55, Issue 5, Pages: 143-153(2021)
- 作者机构：
  
  西安交通大学电气工程学院,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202105016
  CLC： TM77
- Online First：10 May 2021，
  
  Published：2021
- 稿件说明：
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Pilot Protection for High Voltage Direct Current Transmission Line Based on Polarity Characteristics of Converter Control Signal Deviation[J]. 2021, 55(5): 143-153.
DOI：

Pilot Protection for High Voltage Direct Current Transmission Line Based on Polarity Characteristics of Converter Control Signal Deviation[J]. 2021, 55(5): 143-153. DOI： 10.7652/xjtuxb202105016.

摘要

为解决传统高压直流输电线路后备保护因暂态过程闭锁长延时而造成保护性能降低的问题

提出了一种利用换流器控制信号变化极性特征的直流线路纵联保护新原理。通过对换流器动态调节阶段到故障稳态阶段的控制信号特征分析

发现:当发生直流系统故障时

整流器和逆变器的定电流控制信号变化量满足正极性特征且逆变器的定熄弧角控制信号变化量满足负极性特征

而发生交流系统故障时不满足这一控制信号变化特征。根据交/直流侧发生故障后的控制信号变化特征极性差异

构造了基于控制信号幅值变化率和极性特征的启动判据和保护主判据

结合直流母线保护的闭锁信号

提出了直流线路纵联保护新原理

进而实现了直流输电线路故障判别。仿真结果表明:所提保护原理能够在直流线路故障发生后的25～100 ms内快速识别

且在发生500 Ω高阻故障时仍能有效识别。所提保护原理仅需传输单向逻辑信息

对通信要求低

在故障暂态和稳态阶段能够长时投入

整体性能优于传统电流差动保护。

Abstract

A pilot protection for high voltage direct current(HVDC)transmission line based on polarity characteristics of control signal deviation is proposed to solve the problem of insufficient performance of traditional HVDC transmission line backup protection. Analyzing the fault characteristics of the converter control signals from the fault transient stage to the fault steady stage

it is concluded that when the fault occurs in DC system

the deviations of constant current control signals at rectifier and inverter are positive and the deviation of constant extinction angle control signal at inverter is negative

while these polarity characteristics are obviously different when the fault occurs in AC system. By observing the polarity differences of control signal after the fault occurs on the AC/DC side

a start criterion based on the change rate of control signal amplitude and a protection main criterion based on the polarity characteristics of control signal deviation are established. Combining the blocking signal of DC bus protection

a novel DC transmission line pilot protection principle is proposed to identify the fault that occurs on it. The simulation results show that the proposed backup protection can identify the DC line fault within 25-100 ms

and it can also effectively identify the 500 Ω high resistance fault. The protection principle only needs the transmission of single-way logic information and lower communication requirement

and works longer during the fault transient stage to the fault steady stage

and its overall performance is better than the traditional current differential protection.

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references

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