地下交叉互联高压电缆分布式护层电流传感系统的时滞控制方法

doi:10.19595/j.cnki.1000-6753.tces.222116

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摘要

交叉互联高压电缆系统中的分布式护层电流检测对于护层接地故障诊断至关重要。为解决地下高压电缆不依赖外部时标的分布式护层电流传感时间同步问题,该文基于交叉互联高压电缆护层间的耦合关系,采用并联Smith预估补偿器提升时滞补偿效率,获取残差最小的时间偏置补偿时滞量,提出多护层电流传感器时滞误差的递归最小二乘跟踪方法,以电容电流短时不变为稳定判据,对实际测量时分布式护层电流传感器之间的时延进行估计和控制。该方法在220 kV高铁牵引变一次侧高压电缆分布式护层电流传感系统上进行了试验验证,试验表明本方法收敛至最小残差值点,平均残差为0.30 A,准确时滞量为3.93 s,能实现分布式护层电流传感的时间同步。

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关键词 ：高压电缆, 交叉互联, 护层接地电流, 在线监测, 时滞控制

Abstract：

Underground HV (High Voltage) cable is the backbone of modern urban power system. In the last decades, the sheath-to-ground fault is becoming one of main fault modes contributing to the single phase grounding fault. Sheath current sensing is widely adopted in the field test to detect the sheath-to-ground fault. However, the synchronization of distributed sheath current sensing base on GPS (Global Position System) or Beidou is unstable because the time transfer tag is usually unavailable in underground cable tunnel. To achieve the synchronization of distributed sheath current sensing independent of external time transfer provided by GPS or Beidou, a time delay control method based on Smith predictor compensator and recursive least squares method(RLSM) using the capacitive current as reference of the measured sheath current in the same sheath loop is proposed in this paper.
Firstly, the architecture of the distributed sheath current sensing in HV cross-boned cable systems is introduced and the formulation of the measured sheath current in the same sheath loop with time delay is deduced. Secondly, the electromegnetic coupling relationship between the sheath current and load current is modelled, whilst the phasor difference of the measured sheath current in the same sheath loop without time delay is formulated as the reference of the RLSM. Thirdly, the parallel Smith predictor is proposed to compensate the time delay error of the adjacent sheath current detection points in the same sheath loop. Finally, a recursive least squares tracking method for the time delay error of the multi-sheath current sensor is proposed to obtain the time delay with the minimum residual.
The proposed method is verified by field test of a 220 kV cross-boned cable supplying the high-speed traction transformer. The results show that the waveform of capacitive current which is the reference of RLSM inosculates well with difference of the measured sheath current in the same sheath loop after using the proposed method. Besides, the maximum different between them is 0.297 A and the minimum different is 0.002 A. Moreover, the reference standard for time delay estimation is the average residual of the three loops, the minimum residual of each loop is between 0.28 A-0.33 A. In addition, the Smith predictor is translated for the 197th time, and the residual value in the overall range is the smallest when the time delay offset is 3.94 s, which is 0.3 A.
The following conclusions can be drawn from the experiment: (1) the instantaneous value of the current difference between adjacent sheaths in the same loop inosculates with the instantaneous value of the capacitor current after using the proposed method, which implies the synchronization of distributed sheath current sensing. (2) when distributed sheath current sensing is asynchronous, the current phasor difference of the sheath is not accurate, which will affect the evaluation of the grounding state of the sheath. (3) the proposed method converges to the minimum average residual value 0.3 A in the global range, whilst the time delay is 3.94 s.

Key words： HV cable cross-bonding sheath current online monitoring time-delay control

收稿日期: 2022-11-08

PACS:

TM274

基金资助:

湖北省电力公司科技项目（SGTYHT/21-JS-223）和湖北工业大学科研启动基金项目（HSQD2020020）资助

通讯作者: 王航男,1989年生,博士,硕导,研究方向为电力电缆状态检测与新能源并网。E-mail: wanghang@whu.edu.cn

作者简介: 周莎莎女,2000年生,硕士生,研究方向为高压电缆在线监测系统的时滞和误差控制。E-mail: zhou.shasha@hbut.edu.cn

引用本文:

周莎莎, 王航, 杨斌, 夏湛然, 周承科. 地下交叉互联高压电缆分布式护层电流传感系统的时滞控制方法[J]. 电工技术学报, 0, (): 123-123. Zhou Shasha, Wang Hang, Yang Bin, Xia Zhanran, Zhou Chengke. Time Delay Control Method for Distributed Sheath Current Sensing System of Underground Cross-bonding High Voltage Cable. Transactions of China Electrotechnical Society, 0, (): 123-123.

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