基于控保协同的三端混合直流输电系统线路保护方法

doi:10.19595/j.cnki.1000-6753.tces.232070

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摘要

灵敏可靠的保护原理对多端混合直流输电线系统的安全运行具有重要意义,现有多端混合直流系统线路保护原理易受过渡电阻、噪声等因素干扰,且多忽略与换流器控制环节之间的协调配合。为此,提出一种基于控制特征量的多端混合直流线路单端保护方案。首先,利用故障电流变化方向进行故障区域识别;其次,基于不同故障情况下等效阻抗回路中电感的差异,分析不同位置故障时控制信号积分值的大小差异,以此构造区内、外故障识别判据,并利用正、负极控制信号积分值比值进行故障选极。最后,通过PSCAD/EMTDC进行仿真验证,结果表明所提保护方案能够可靠、灵敏地识别各种故障,且具有较强的抗干扰和抗过渡电阻能力。

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关键词 ：多端混合直流输电, 控保协同, 积分值, 线路保护, 拉普拉斯变换

Abstract：

The Hybrid DC transmission system integrates the advantages of conventional DC transmission systems and flexible DC transmission systems, gradually becoming a development trend of long-distance and large-capacity power transmission. However, its topology structure is complex and the operation mode is flexible. And it commonly employs overhead lines, the fault probability of the overhead lines is high and the fault current will be several times the rated current within a short time after the DC-side fault. Therefore, studying sensitive and reliable protection methods for DC transmission lines is of great significance. Most of the existing protection methods proposed for DC transmission lines have overlooked the coordination between control and protection. Therefore, this paper proposes a protection method for DC transmission lines utilizing control characteristic quantities.
First, the three-terminal hybrid DC transmission system is modeled. On this basis, the direction of the short-circuit current fault component after the DC-side fault is analyzed, and the fault area can be determined based on the direction change. Second, based on the superimposed network and the Laplace transformation, the time-domain expression of the DC current fault component is calculated, revealing the negative correlation with the equivalent inductance value in the fault circuit. By utilizing the relationship between the port voltage and the DC current fault component, the DC voltage variation is obtained. By substituting it into the expression of direct-axis reference current variation integral, it is found that the direct-axis reference current variation integral is also negatively correlated with the equivalent inductance value in the fault circuit. Subsequently, the difference of the equivalent inductance value in the fault circuit of internal and external faults is analyzed, and it can be seen that the maximum equivalent inductance value during internal faults is less than the minimum equivalent inductance value during external faults. Therefore, it can be deduced that the minimum integral value of the direct-axis reference current variation during internal faults is larger than that during external faults. Based on this characteristic, the protection method is constructed by using the integral value of the direct-axis reference current variation. Finally, extensive simulation analysis, taking into account various influencing factors such as fault location, fault type, sampling frequency and fault resistance, is carried out on PSCAD / EMTDC to verify the reliability and sensitivity of the proposed protection method.
The conclusions can be drawn as follows: When the three-terminal hybrid DC transmission lines have an internal fault, the integral value of the direct-axis reference current variation of the T-zone converter station is always greater than that during external fault. This paper fully makes use of the characteristics of the direct-axis reference current variation integral value of the T-zone converter station after DC-side faults to propose a protection method for DC transmission lines based on the coordination of control and protection. The proposed protection method is easy to implement and its settings value can adapt to control parameters. In addition, compared with the traveling wave protection method, the proposed protection method requires lower sampling frequency and less data communication.

Key words： Multi-terminal hybrid DC cooperation of control and protection integral quantity line protection Laplace transformation

收稿日期: 2023-12-13

PACS:

TM721.1

基金资助:

国家自然科学基金资助项目（51877084）

通讯作者: 戴志辉男,1980年生,教授,博士生导师,研究方向为电力系统保护与控制。E-mail：daihuadian@163.com

作者简介: 牛宝仪女,2000年生,硕士研究生,研究方向为直流输电系统保护与控制 E-mail：a15803265866@163.com

引用本文:

戴志辉, 牛宝仪, 李铁成, 奚潇睿, 李杭泽. 基于控保协同的三端混合直流输电系统线路保护方法[J]. 电工技术学报, 0, (): 2024031407-2024031407. Dai Zhihui, Niu Baoyi, Li Tiecheng, Xi Xiaorui, Li Hangze. Line protection method of three-terminal hybrid DC transmission system based on control and protection coordination. Transactions of China Electrotechnical Society, 0, (): 2024031407-2024031407.

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