电工技术学报
论文 |
基于扩展卡尔曼滤波的水中放电阶段辨识方法
高崇1, 邵在康1, 康忠健1, 傅雪原1, 侯腾飞2
1.中国石油大学(华东)石大山能新能源学院 青岛 266580;
2.中国石油集团工程技术研究院有限公司 北京 102206
Method for Identifying Stages of Discharge in Water Based on Extended Kalman Filter
Gao Chong1, Shao Zaikang1, Kang Zhongjian1, Fu Xueyuan1, Hou Tengfei2
1. Department of New Energy China University of Petroleum Qingdao 266580 China;
2. China National Petroleum Group General Research Institute of Engineering and Technology Corporation Beijing 102206 China
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摘要 

水中脉冲放电中的电弧通道发育具有强随机性,难以固定时域进行放电阶段划分,故水中脉冲放电阶段的辨识方法研究极为重要。该文建立了水中脉冲放电等效电路模型并阶段化分析了电阻时变特性,得到了判定放电阶段的临界参数阈值;采用扩展卡尔曼滤波算法将离散电阻数据连续化的同时,降低随机放电带来的噪声,从而获得辨识时变电阻模型;计算辨识电阻斜率,并依据斜率变化特性及变化系数K判定预击穿放电阶段和剧烈放电阶段;最终通过水中脉冲放电观测实验平台验证了有效性。结果表明,基于扩展卡尔曼滤波算法得到的水中脉冲放电电阻较试验值的方差小于1.717,电阻斜率方差小于1.899,故该方法可用于水中脉冲放电阶段的判定。

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高崇
邵在康
康忠健
傅雪原
侯腾飞
关键词 水中脉冲放电时变电阻扩展卡尔曼滤波放电阶段辨识    
Abstract

High-voltage pulsed discharge in water is a complex plasma generation and collapse process involving coupled physical processes, such as electricity, light, and heat. The discharge process consists of pre-breakdown, violent, and oscillatory discharge stages. The main existing method for determine the discharge stage is by using high-speed camera photography, but this approach is not suitable for practical applications environment of pulsed discharge technology in water. Additionally, the development of the arc channel during repeated discharges exhibits strong randomness, making it difficult to classify discharge stages within a fixed time domain. Therefore, studying the identification method of the underwater discharge stage is crucial. This paper proposes a corresponding method based on the arc impedance change characteristics of the discharge in water.
Firstly, the plasma change characteristics observed at each discharge stage are amalgamated to elucidate the variations in resistance. The initial plasma channel is formed during the pre-breakdown discharge stage. It continues to ionize to form a more robust initial arc channel under the action of an external electric field, with a more stable and linear decline in resistance. Subsequently, a dense arc is established once the plasma density within the channel surpasses a critical threshold, leading to a sudden surge in plasma density and a rapid decrease in resistance. Nevertheless, with the diminishing strength of the external electric field, sustaining a balanced arc discharge becomes impracticable, resulting in the extinction of the arc. The channel retains a substantial plasma that gradually diminishes over time at this stage and makes the resistance progressive increase.
Secondly, the discharge process in water is mainly carried out in an inhomogeneous medium. Hence, the arc channel morphology and spatial location are random, and the resistance values within each discharge cycle in a repetitive discharge environment also vary. The Extended Kalman Filtering algorithm filters the measured resistance data against the randomness, thus obtaining a representative value of the identified resistance. Solving the slope of the resistance change at each moment and combining it with the characteristics of the changes in each discharge stage, a threshold value for the resistance change rate is derived. This threshold value serves as a criterion to determine the transition of the discharge stage.
Finally, the experimental platform for pulse discharge observation in water confirmed the effectiveness of the method, and an analysis of errors was conducted. Further experimental validation analyses were carried out at the biggest distance electrode gaps of 2.04 mm and 3.01 mm based on gap distances equal to 0.62 mm, 1.01 mm, and 1.38 mm. Additionally, the conductivity of the solution is increased to 4 685.13 μS/cm, 6 740.45 μS/cm, 7 820.62 μS/cm, 12 340.68 μS/cm, and 19 319.25 μS/cm, respectively. The results indicate that the variance of the identified resistance values obtained based on the Extended Kalman Filter algorithm for underwater pulse discharge is less than 1.717 compared to the experimentally measured resistance values. Moreover, the variances of the two type's resistance slopes are less than 1.899, with a relative error of the resistance slope being less than 0.089. Despite variations in electrode gap distance and solution conductivity, this method maintains high accuracy. Thus, it is suitable for determining discharge stages in the underwater pulse discharge process.

Key wordsPulse discharge in water    time-varying resistance    Extended Kalman Filtering (EKF)    discharge stage identification   
收稿日期: 2023-03-21     
PACS: TM89  
基金资助:

国家重大科技专项(2016ZX05034004)和中国石油大学(华东)研究生创新基金(YCX2021109)资助项目

通讯作者: 康忠健 男,1971年生,教授,博士生导师,研究方向为脉冲功率技术应用、脉冲谐波共振破岩技术。E-mail:kangzjzh@163.com   
作者简介: 高崇 男,1995年生,博士研究生,研究方向为脉冲功率技术应用及优化。E-mail:kmlggc@163.com
引用本文:   
高崇, 邵在康, 康忠健, 傅雪原, 侯腾飞. 基于扩展卡尔曼滤波的水中放电阶段辨识方法[J]. 电工技术学报, 0, (): 239612-239612. Gao Chong, Shao Zaikang, Kang Zhongjian, Fu Xueyuan, Hou Tengfei. Method for Identifying Stages of Discharge in Water Based on Extended Kalman Filter. Transactions of China Electrotechnical Society, 0, (): 239612-239612.
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https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.230336          https://dgjsxb.ces-transaction.com/CN/Y0/V/I/239612