Table of Content

25 April 2022, Volume 42 Issue 2

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Researches and Tests

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Optimization of Utility Boiler Soot-Blowing Strategy Based on Soot-Blower Sensitivity Analysis

MEI Hailong, PU Jingfan, ZHOU Lin, YU Bing, ZHANG Lin, TAN Peng

2022, 42(2):  1-4.  doi:10.3969/j.issn.1008-0198.2022.02.001

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This paper takes a 1 000 MW ultra-supercritical coal-fired boiler as the research object, uses its historical operation data to analyze the sensitivity of the soot blower of the thermal power units based on data mining. The results show that there are different degrees of soot blower sensitivity difference on each heating surface. Based on the sensitivity analysis, the corresponding soot blowing strategies are optimized for different heating surfaces, which is helpful to improve the efficiency and economy of the units.

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Reactive Voltage Rapid Optimization Control of Doubly-Fed Wind Farm Based on Model Predictive Control

LI Shengqing, CHEN Xin, ZHENG Jian, ZHU Guangming, WEN Yanxi

2022, 42(2):  5-10.  doi:10.3969/j.issn.1008-0198.2022.02.002

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Aiming at the problem of reactive power control lag and poor voltage command following in single time section prediction information of wind farm, a reactive power and voltage control strategy of doubly fed wind farm based on model predictive control is proposed. The strategy aims at minimizing the deviation between the grid-connected point voltage and the terminal voltage of the wind farm. Firstly, the reactive power equipment output and load demand prediction information are calculated based on the time scale, and the reactive power voltage prediction control model is established. Secondly, more detailed prediction control points are divided in the control cycle, the prediction model is modified, and the dual system control instructions are coordinated and distributed in advance to effectively reduce the reaction time. When the wind speed fluctuates rapidly, the voltage control performance can be optimized and the tracking accuracy can be improved, so that the reactive power equipment can quickly compensate the reactive power to stabilize the voltage of the grid-connected point, and the dynamic reactive power capacity of the static var generator can be reasonably regulated to maximize the reactive power reserve. A doubly-fed wind farm model is established in MATLAB / Simulink for simulation. The results show that the proposed strategy can quickly coordinate the output of reactive power equipment, effectively reduce the reaction time, and enhance the rapid adjustment ability of reactive power in wind farms.

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Analysis on Scheduled Trading Interval Optimization Based on Pricing Strategy of Adjustable Load

ZHOU Tao, QIAN Hanhan, ZHANG Wei, HU Tao, LI Shenghu

2022, 42(2):  11-16.  doi:10.3969/j.issn.1008-0198.2022.02.003

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In this paper, the fitting model between the prediction accuracy and the scheduled trading interval is proposed based on the least square method,in order to refine the load forecasting model. Considering the cost of the adjustable load, its pricing model related to the scheduled trading interval is proposed. Considering the penalty price of the prediction deviation, an optimization model is proposed to determine the optimal scheduled trading interval with the least total cost of the power retail company. The simulation results show that pricing to the adjustable load has larger impact on the total cost than the penalty price. The total cost of the distribution company can be reduced by selecting the users with large adjustable load capacity, small actual load regulation and long dispatch time when the load regulation quantity is determined.

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Comparison and Effect Analysis of Anti-Environmental Interference Methodologies for Transformer Noise Test

ZHANG Minghai, YANG Chunxin, WU Xiaowen

2022, 42(2):  17-24.  doi:10.3969/j.issn.1008-0198.2022.02.004

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Transformer test result is commonly influenced by its surrounding environmental interference. Based on the characteristics analysis of insect, bird, frog and automobile noises, three anti-interference methodologies are proposed in this paper, which are wavelet packet-spectral subtraction, short-time frame and filter design, respectively. Under the influence of insect, bird, frog and automobile noises with different signal-noise ratios, the anti-interference effects of the three methods are compared. Field test is conducted to verify the proposed methods. Finally, the application principle of the anti-interference methods is discussed. The result shows that wavelet packet-spectral subtraction and filter design methods will achieve better result than short-time frame method for different environmental interference types. However, better general applicability is found about the wavelet packet-spectral subtraction method for burst intermittent interference. In the field application process, proper method should be chosen according to actual demand. The result will provide critical reference for transformer noise test accuracy enhancement under complex environmental interference condition.

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Construction and Application of Battery Management System Test Platform Based on RTDS

GONG Yusheng, TANG Shasha, LI Li ,XIONG Shangfeng, WU Jinbo, LI Hui, TANG Qiantao

2022, 42(2):  25-28.  doi:10.3969/j.issn.1008-0198.2022.02.005

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In order to verify the reliability and stability of the battery management system in different environments in the energy storage power station, an RTDS-based simulation test platform for the battery management system of the energy storage power station is built, and the battery management system is tested on this platform. Carrying out battery management system testing on the RTDS simulation platform can effectively avoid the risks caused by real battery testing. It also has high flexibility, can simulate different environments, and quickly perform charge and discharge tests and SOC accuracy measurements.

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Research on Dispatching Intelligent Balance System in Novel Power System

ZHANG Siyuan, LONG Gaoxiang, ZHOU Guohai, ZHANG Xiaoyu, LIU Dunnan, GAO Yuan

2022, 42(2):  29-36.  doi:10.3969/j.issn.1008-0198.2022.02.006

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Aiming at the difficulty of real-time dispatching in new power system, an intelligent dispatching balance system is constructed in this paper. In the intelligent balance mode of the system, the power deviation of connection line is automatically tracked, and the future power deviation is predicted by combining the ultra-short-term load forecast data, and the balance control of the future trend is carried out in advance by using adjustable resources. Secondly, combined with the characteristic of the transition stage from planning to power market, the peak cost function system of dispatching resources is constructed to accurately quantify the regulation ability of various resources. Finally, based on the cost function, the rolling optimization model of intraday planning is constructed with the high cost peaking resource as the marginal condition and the minimum overall regulation cost as the objective, so as to form the intraday power generation plan meeting the optimal balance mode. An example is given to demonstrate the superiority of the proposed intelligent dispatching method, which can realize the safe, economical and efficient cooperative interaction of the source network charge and storage in the new power system.

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Electric Energy Trading Strategy Decision Method for Energy Traders Based on Incomplete Information Game

ZHANG Linna, LIU Yongyan, LI Haojiong

2022, 42(2):  37-43.  doi:10.3969/j.issn.1008-0198.2022.02.007

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Electricity sale side marketing is the development trend of regional power grid, a reasonable and effective trading strategy is of great concern for increasing economic benefit of market trading subjects. This paper carries out the research of the energy trading strategy of energy traders in marketing operation pattern of regional power grid. Firstly, the organization structure and operation mode of the regional power grid marketing pattern are introduced, and the electricity quantity price models of both the energy purchase and sale sides are established based on the current transaction mode. Then feasible strategy of energy traders is developed based on the reverse pricing method of marketing theory, and the energy trading strategy decision method of energy trader in unilateral and bilateral incomplete information game scenes is designed. The correctness and validity of the proposed method are verified by specific examples. This paper provides a reference for the development of the trading strategy of market trading subject in the fully open electricity market.

New technology and Application

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Transmission Line Insulator Identification Based on Improved Libra-RCNN

LYU Haiqing, LEI Yuanhua, WANG Jing, XING Xuemin, YANG Jing

2022, 42(2):  44-49.  doi:10.3969/j.issn.1008-0198.2022.02.008

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To solve the problems of poor positioning accuracy and stability of existing insulators identified by UAV aerial photography transmission lines, a Libra-RCNN insulator detection model based on ASFF pyramid network is proposed. Firstly, the FRN normalized layer is used to replace the original BN layer to eliminate the dependence of the normalized layer on the size of training batch and increase the learning efficiency of the model.Then, ASFF network structure is introduced into Libra-RCNN algorithm pyramid to effectively solve the problem of inconsistency inside the feature pyramid.Finally, GIoU crossover ratio is used to replace the original IoU crossover ratio to better accurate insulator position.In Insulators_Datasets data set, the average accuracy of improved Libra-RCNN model is 94.10%, and the recall rate is 97.51%.Compared with the original Libra-RCNN model, the improvement rate is 2.23% and 2.61% respectively, which indicates that the proposed algorithm can identify insulators stably and effectively.

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Research on Arc Grounding Overvoltage and Suppression Measures in Distribution Network

HAI Bin, ZENG Zeyu, LI Chao, LIU Wei

2022, 42(2):  50-54.  doi:10.3969/j.issn.1008-0198.2022.02.009

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For the problem of overvoltage generated by single-phase arc grounding in 10 kV distribution network, three suppression methods of neutral point grounding via arc extinguishing coil, neutral point grounding via resistance and fault phase throwing grounding resistance are proposed. The arc grounding model under distribution network are built in ATP-EMTP software to simulate the voltage characteristics. The advantages and disadvantages of three methods are compared in view of the suppression effect to the arc grounding overvoltage. The results show that the mentioned three methods can effectively reduce the arc grounding overvoltage. Grounding the neutral point via the arc extinguishing coil is a more ideal method for urban distribution system due to its better effect.

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Research on Main Insulation Defect of Cable Fusion Joint Based on Digital Ray Detection Technology

LIU Sanwei, TANG Yongming, ZHOU Weihua, DUAN Xiaoli, HUANG Fuyong, FANG Chaowen, QIU Chao

2022, 42(2):  55-58.  doi:10.3969/j.issn.1008-0198.2022.02.010

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In recent years, high-voltage cable fusion joint technology has gradually been applied in the field, but the key technology in the production process lacks effective management and control means. In order to solve these problems, the image depth intelligent processing digital ray (IDIP-DR) detection technology is used to detect the key fabrication process of high-voltage cable splice.After testing, it is found that there is a bubble construction technology problem in the main insulation.The causes of the defects are analyzed and the corresponding process control suggestions are put forward.

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Research on High Voltage Cable Core Temperature Prediction Based on Data Driven Model

CHEN She, WANG Juan, ZENG Zeyu, ZHOU Pan

2022, 42(2):  59-63.  doi:10.3969/j.issn.1008-0198.2022.02.011

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Temperature is one of the important physical quantities to determine the operating status of the cable, but usually only the temperature of the outer sheath can be monitored, while the temperature of the cable core cannot be directly obtained. In this study, a temperature field model of tunnel laying 110 kV cable is built, incorporating the real-time monitoring temperature of the cable outer sheath. The cable temperature distribution is thus obtained by optimizing and correcting the physical quantities such as material parameters of the cable to make the model more consistent with the real operation state. The influences of parameters such as dielectric loss factor, dielectric constant and thermal conductivity of XLPE on the physical model of cable temperature prediction are further discussed. The temperature distribution of low resistance grounding fault in cable is simulated. It was found that the difference between the fault phase cable core temperature and its outer sheath temperature was 47 ℃, and this cable core temperature can reach 250 ℃, and meanwhile, the temperature of the same circuit non-fault phase cable core also rose to more than 120 ℃, which was in severe overload state. The data-driven high voltage cable model in this paper can effectively calculate the cable core temperature, which helps to grasp the core data and working status of cable operation,so that it can lay the foundation for the final construction of the cable digital twin model.

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Design and Test of Explosion-Proof Transformer Foam Spray Fire Extinguishing System

CHEN Baohui, LIU Yu, ZHOU Tiannian, LI Bo

2022, 42(2):  64-67.  doi:10.3969/j.issn.1008-0198.2022.02.012

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To solve the problems of the traditional transformer foam spray extinguishing system, such as poor explosion-proof ability of pipe network, inconvenient debugging, short service life of fire extinguishing agent, and easy blocking of nozzle, an explosion-proof transformer foam spray extinguishing system using nozzle with long rang is designed. The simulated fire extinguishing test platform is built to compare the fire-extinguishing performance of the explosion-proof foam spray extinguishing system and the traditional foam spray extinguishing system.The test results show that the system is efficient, economical, practical and easy to operate.

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Development and Application of Low Voltage Comprehensive Treatment Software System

TAN Aibin, YIN Jun

2022, 42(2):  68-72.  doi:10.3969/j.issn.1008-0198.2022.02.013

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Aiming at the problem of low voltage in rural distribution grid, based on the theoretical basis of the π-type equivalent circuit of the line,the paper analyzes the topological structure and wiring form of the medium and low-voltage distribution grid, and applies the voltage calculation of the π-type equivalent circuit to the middle and low voltage distribution grid. In low voltage lines, a theoretical model of voltage point-by-point calculation is formed. According to the theoretical model of voltage point-by-point calculation, a scientific, practical and easy-to-use low-voltage comprehensive management software system is compiled using the VC programming language, which is convenient for basic level technicians to judge whether there will be a low voltage problem in the power supply area in time, so as to make preparations for construction and transformation in advance. The system also provides a direct basis for the compilation of the construction and transformation plan of the distribution grid to more accurately solve the low voltage problem of the rural distribution grid.

Experience and Discussion

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Design and Practice of Hunan Peak Regulation Auxiliary Service Market Based on Multi-Resource Collaborative Optimization

LIU Chang, SUN Jin, CHEN Bin, YANG Ruixi, CHEN Linyi, ZHU Shuangzhe

2022, 42(2):  73-79.  doi:10.3969/j.issn.1008-0198.2022.02.014

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Hunan power grid is facing a serious difficulty of peak regulation, and the establishment of a peak regulation auxiliary service market is a key means to solve this difficulty. This article introduces the main trading rules of the Hunan peak regulation ancillary service market. Combining the actual situation of Hunan power grid, the “thermal power—pumped storage—energy storage” multi-resource coordination, “day ahead—day in” two stage optimization of peak regulation auxiliary service market clearing mechanism is established, and a peak-regulation auxiliary services market system is designed. According to the market operation, the results and experience of Hunan peak regulation auxiliary service market are analyzed and summarized, and the follow-up improvement direction is proposed.

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Analysis and Countermeasures of Oil Immersed Inverted Current Defect

XU Peng, CUI Guanglu, GAN Qiang, CHEN Hao, ZHANG Haihua, TAN Fenglei

2022, 42(2):  80-84.  doi:10.3969/j.issn.1008-0198.2022.02.015

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In this paper, the batch defects of a 500 kV oil immersed current transformer were investigated. Through the diagnosis test and disassembly analysis, the main reasons for the defects of this type of current transformer are found to be the local wrinkled paper damage caused by the extrusion and friction between the body and the oil conservator. Under the high frequency overvoltage, the local wrinkled paper breaks down to produce acetylene. Finally, the corresponding suggestions and measures are put forward to provide reference for fault diagnosis and operation maintenance of the same type of current transformer.

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Algorithm Optimization Study on Linearity Error of High-Voltage Switch Cabinet Partial Discharge Detection Equipment

HU Sukai, WANG Yuwei, TANG Yongming, WANG Lirong, LI Xin, XIAO Jing

2022, 42(2):  85-88.  doi:10.3969/j.issn.1008-0198.2022.02.016

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Checking and comparing the hardware performance indexes of high-voltage switch cabinet on-line detection equipment, such as linearity error and stability, is the prerequisite for carrying out on-line detection. According to the field application requirements of on-line detection equipment of high-voltage switch cabinet, the least square method is used to optimize the linearity error algorithm. The theoretical and practical results show that the optimized algorithm can improve the accuracy of linearity error calculation, so as to realize the accurate verification and comparison of on-line detection equipment.

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Analysis and Solution Ideas on Current Operation and Maintenance Situation of Energy Storage Power Station on Grid Side in Hunan Power Grid

YU Bin, XU Biao, ZHOU Ting, HUANG Bowen, XIAO Haolong

2022, 42(2):  89-93.  doi:10.3969/j.issn.1008-0198.2022.02.017

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This paper introduces the basic structure composition, supporting role and business model of energy storage power station on grid side of Hunan power grid. The construction, operation and maintenance of energy storage power station on grid side of domestic power grid side are summarized. The pain points and difficult problems existing in Hunan energy storage power station construction, operation and maintenance are expounded from five aspects, including standards and specifications, battery body, safety prevention and control, quality control and emergency disposal. In view of the current problems, some solutions are put forward in order to improve the operation and maintenance control level of energy storage power station on grid side in Hunan power grid side, and ensure the safe and stable operation of energy storage power station.

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Research on Reason and Treatment Measures of Secondary Cable Insulation Defects in Transformer Substation

XIAO Haolong, ZANG Xin, LIANG Wenwu, OUYANG Fan, XU Song

2022, 42(2):  94-97.  doi:10.3969/j.issn.1008-0198.2022.02.018

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The secondary cable is the important bridge connecting the primary equipment and the secondary equipment,and the insulation reliability will affect the operation reliability of the secondary equipment. Trough field sampling and dissecting the accident cable,it is found that the causes of insulation defects of secondary cable are cable head damage, moisture intrusion,meterial and structure defects and operation inspection management defects, and the technical solution is given.

Faults and Analysis

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Analysis of Smart Distribution Network Business Scenario Application Based on 5G

LI Na, YANG Zhenyi, ZENG Jie, ZHONG Keyue, PENG Ziwei, WU Xiang

2022, 42(2):  98-104.  doi:10.3969/j.issn.1008-0198.2022.02.019

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This paper analyzes the basic concept and general framework of the energy internet, introduces the technical features of 5G, and on this basis, combining with the requirements of the future power grid interconnection, from three aspects of distribution network automation, distribution network differential protection and precise load control, the application of 5G technology in distribution network service scenario is analyzed in detail.

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Analysis of Typical Problems in Sampling Inspection of Primary and Secondary Fused Pole-Mounted Switch in Distribution Network

YOU Kai, CHEN Wei, WANG Huan, HU Jiarui, DENG Wenxing, CHEN Xiaorong

2022, 42(2):  105-107.  doi:10.3969/j.issn.1008-0198.2022.02.020

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In view of the major equipment quality problems found in the past two years, the structure and principle of the internal transformer of the primary-secondary fused pole-mounted switch are analyzed.This paper analyzes the root cause of unqualified temperature rise test through test and disassembly inspection, and finally puts forward improvement suggestions from test standard, sampling inspection strategy and test method.