Table of Content

25 June 2022, Volume 42 Issue 3

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Study on Transmission Fault Traveling Wave Signal of Typical Power Equipment in Transmission Network

LI Zewen, TANG Di, JIANG Yunchen, SUN Jian, WANG Shuai, XIA Yixiang

2022, 42(3):  1-8.  doi:10.3969/j.issn.1008-0198.2022.03.001

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The fault traveling wave technology has been widely used in the transmission network. However, there are obvious differences in the traveling wave transmission process of different power equipment. Therefore, it is necessary to study the characteristics of the power equipment transmission fault traveling wave signal.This paper first analyzes the composition of fault traveling waves in substation, and then analyzes the transmission characteristics of fault traveling waves in typical substation equipment.Finally, the influence of different power components in the substation on the traveling wave signal is analyzed, and the essence of the traveling wave signal of the power equipment transmission fault is revealed.

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Study on Subjective Feelings of Noise Emission from Substation Boundary

YU Yanqing, CAI Jun, YANG Zhu, HU Sheng, YANG Jinchun

2022, 42(3):  9-12.  doi:10.3969/j.issn.1008-0198.2022.03.002

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With the improvement of people's requirements for living environment, the impact of substation characteristic low-frequency noise on human body has gradually attracted great attention. The study of subjective feelings of low-frequency noise in the substation has become the essential part. Therefore, this paper takes the noise emitted at the boundary of the actual substation as the object, analyzes the annoyance degree and puts forward the limit suggestions combined with the existing standards. The results show that 55 dB(A) is the sudden increase point of noise annoyance, and loudness determines the annoyance, which is significantly positively correlated with annoyance. The results provide a reference for the prediction and prevention of noise pollution in substations.

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Problem Analysis and Simulation Research of Voltage Quality of Rural Power Grid in High-Altitude Remote Areas

JIANG Liqing, YANG Jindong, YANG Yanjun, ZHANG Min, WU Shaopeng, HE Zhiquan, RONG Fei

2022, 42(3):  13-19.  doi:10.3969/j.issn.1008-0198.2022.03.003

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The Yunnan-Guizhou Plateau of China is mostly poor areas, and most of these areas are based on large power grids + small hydropower power supply grids, which are at the end of the distribution network, and does not meet the N-1 reliability configuration, the problem of voltage unqualified is very prominent. In this paper, the voltage quality problem of a rural power grid in the Yunnan-Guizhou Plateau is studied, and the problem of high and low voltage of power supply lines is explored in depth based on the actual operation of the local power grid, and the main influencing factors of the voltage rise and fall of distribution lines are analyzed. Based on this, in order to solve the problem of power supply voltage quality of rural power grid in this region, this paper proposes a method for establishing a small microgrid + energy storage in combination with the current situation of the local power grid, and with the help of Matlab/Simulink simulation software, a simulation analysis model of rural distribution network is established, which is further verified, and the feasibility of the solution proposed in this paper is verified through simulation analysis, which provides certain theoretical support for enhancing the power supply capacity of the local power grid and improving the reliability of power supply.

Researches and Tests

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Comprehensive State Evaluation Method of Circuit Breaker Health State Based on Variable Weight

CHEN Hao, MA Zhaoxing, WU Siying, XU Peng, ZHANG Ming

2022, 42(3):  20-24.  doi:10.3969/j.issn.1008-0198.2022.03.004

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High voltage circuit breaker is the key equipment of substation. It is of great significance to evaluate the operation state of circuit breaker comprehensively and accurately to ensure the reliable operation of power grid. Based on the idea of variable weight, a fuzzy comprehensive evaluation method for circuit breaker state evaluation is presented in this paper. In this paper, the comprehensive state evaluation indexes are given, each index quantity is normalized, the variable weight coefficient of each state quantity is calculated,furthermore the fuzzy correlation between the indexes is given. The balance of multiple factors is considered, and an accurate comprehensive evaluation system of circuit breaker reflecting the actual operation demand is established. Based on expert experience and condition evaluation guidelines, the status of circuit breaker is divided, and finally the comprehensive condition evaluation results of circuit breaker are given. Finally, the practical analysis of a circuit breaker in a substation in Jiangsu Province show that the comprehensive evaluation method proposed in this paper has high accuracy and adaptability.

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Performance Research and Optimization Strategy of Incineration System Under Waste Classification Background

NI Kunpeng, HE Ruoyu, LIU Liang

2022, 42(3):  25-28.  doi:10.3969/j.issn.1008-0198.2022.03.005

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Garbage classification can significantly improve the calorific value of garbage, which puts forward new requirements for the existing technical process and equipment of waste incineration power generation. This paper studies the design scheme and operation of a waste incineration power generation project in Shanghai. The study found that due to the implementation of waste separation, the calorific value of waste and boiler evaporation increased along with the furnace temperature, which led to serious coking in the furnace and an increase in the concentration of pollutant emissions in the flue gas. The paper proposes that improving the furnace structure, increasing the furnace heating surface and using the flue gas recirculation process it can effectively reduce the adverse impact of the increase in calorific value of incoming waste. The methods provide useful reference for waste incineration equipment and process design.

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Analysis of Safe and Stable Operation of New Power System

ZHONG Wei, ZHOU Yujie, WANG Zeye, SONG Junying

2022, 42(3):  29-34.  doi:10.3969/j.issn.1008-0198.2022.03.006

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To realize the goal of carbon peak and carbon neutrality, it is necessary to construct new power system dominated renewable energy. In order to ensure the security and stability operation of the new power system, the characteristics are analyzed, including energy structure and distribution, energy storage development and changing load. And it is expounded that the new challenges will be faced in secure and stable state,stable control and dispatch operation of power system. It is also presented that the research on frequency stability control should be done and frequency collaborative and emergency control systems should be constructed on new power system.It is proposed that a new type of power system frequency stability control research should be carried out, a regional frequency coordination and emergency frequency control system should be constructed, and a wide-area dispatch control mode with unified dispatch and hierarchical management across regions and voltage levels should be established. A new power system cognitive system is build,the operating characteristics of power system are grasped fully.The digital perception ability of power system is improved,and a wide area transfer technical support system is established.The adjustable resources of power system are tapped fully to improve the flexible regulation ability of new power system.

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Research on Configuration of Distributed Synchronous Condenser in UHV AC / DC Hybrid Power Grid

GAN Wangwei, CHEN Daojun, CUI Ting, PU Xi, ZUO Jian, LIU Yongyan

2022, 42(3):  35-42.  doi:10.3969/j.issn.1008-0198.2022.03.007

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After the operation of 1 000 kV Xiaoxiang-Ganjiang UHV AC double circuit line, the transient voltage stability characteristics of Hunan power grid have been significantly improved. However, due to the mismatch between power supply construction and load growth, there are still voltage stability problems in Hunan power grid in wet and heavy load periods.Distributed synchronous condenser can provide strong moment of inertia and fast reactive power support for the system, and it is an important technical means to solve the problem of voltage stability of the receiving end power grid. Firstly, this paper compares the transient voltage support effects of different voltage levels in different substations in central and southern Hunan, and obtains the optimal configuration scheme of the condenser in Hunan power grid. Then it is proved that after the central China UHV AC loop network is put into operation, the new condenser can improve the transient voltage stability level of the power grid, release the standby of thermal power units and replace the startup of thermal power units, so as to play a great role in improving the Qi-Shao DC power transmission capacity, the overall power supply capacity of the whole province, the clean energy consumption capacity and the flexibility of power grid operation mode.

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Linkage Control Strategy of Energy-Storage Dual-Feed Wind Unit and SVG Reactive Voltage

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

2022, 42(3):  43-48.  doi:10.3969/j.issn.1008-0198.2022.03.008

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This paper aims at the problem that the traditional linkage control of doubly fed fan is difficult to realize voltage support due to the voltage fluctuation of parallel network of doubly fed fan. A reactive power linkage control strategy of energy storage doubly fed induction generator (DFIG) and static var generator (SVG) is proposed. According to the reactive power demand in case of voltage drop at the parallel node, the energy storage DFIG is linked with SVG to carry out reactive power compensation by stages. In the first stage, the reactive power support is completed by the unit itself, the grid side converter is converted from the unit power factor mode to the reactive power compensation mode and the remaining reactive power deficiency is put into SVG to assist the unit in reactive power compensation.In the second level, the reactive power capacity allocated to the wind turbine is distributed to each unit one by one, according to the real-time regulation range of reactive power of each unit. When the voltage drop of the parallel node is greater than 30%, it is necessary to consider putting the super capacitor into operation to ensure the normal operation of the unit. The simulation results show that the strategy can suppress 15% voltage drop when the voltage drop is 30%; 98% reactive power and voltage support can be realized within 2 seconds, which can quickly and effectively improve the low-voltage ride through capability of doubly fed wind farm.

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Research on Distributed Photovoltaic Grid Connection Modeling Based on RTDS

XU Biao, LONG Xuemei, YAN Yabing, DING Yu, OUYANG Zongshuai

2022, 42(3):  49-54.  doi:10.3969/j.issn.1008-0198.2022.03.009

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With the large-scale development of distributed photovoltaic, it is necessary to strengthen the modeling research of distributed photovoltaic grid connection. Firstly, based on RTDS real-time simulation platform, photovoltaic grid connected models such as photovoltaic array, grid connected inverter, filter and isolation transformer are established. Secondly, when the power grid is three-phase symmetrical, the double loop control structure is used to build the photovoltaic control system model. Then, considering the asymmetric fault of power grid, a photovoltaic negative sequence control model based on double synchronous rotating coordinate system is established. Finally, the simulation results show that the proposed model also has good performance in case of power grid failure, and it is verified that photovoltaic negative sequence control can effectively reduce negative sequence current and current distortion.

New technology and Application

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Research and Application of Secondary Cable Laying Technology in Substation Based on BRCM Software

ZHANG Xiaobing, LI Can, WANG Kun, LING Zhiyong, ZHANG Yi, ZHOU Chao

2022, 42(3):  55-58.  doi:10.3969/j.issn.1008-0198.2022.03.010

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In order to avoid the inaccurate listing of substation secondary cable quantity under the two-dimensional design mode, which cannot meet the requirements of current precise investment, the paper proposes to use BRCM three-dimensional software modeling to realize automatic laying of substation secondary cable according to the optimized path. Firstly, the process of cable laying design by BRCM software is introduced in detail. Secondly, taking a certain 110 kV substation as an example, the three-dimensional model of substation cable trench, cable bracket and electrical equipment is established. The cable laying principle is set, and the cable list with optimized path can be exported with one click. Finally, the estimated cable consumption of two-dimensional design and the actual cable consumption of three-dimensional simulation optimized path are compared and analyzed. The data show that,with the application of BRCM software, the investment is reduced by 10.8% compared with the total amount of two-dimensional design cable, and the result of precise investment is achieved. The error between BRCM software and the actual cable laying amount is less than 5%, which meets the requirements of engineering specifications.It shows the feasibility and reliability of the path optimization of BRCM 3D modeling.

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Automatic Detection Method of TA Polarity of Zero Sequence Differential Protection for Generator Transformer Unit

DING Xin, XU Tianle, JIANG Weimin, MO Fei

2022, 42(3):  59-64.  doi:10.3969/j.issn.1008-0198.2022.03.011

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This paper introduces the principle of zero sequence differential protection, aiming at the problem of polarity verification of step-up transformer zero sequence differential protection current transformer (TA), uses the unbalanced current generated by magnetizing inrush current when the transformer is charged, extracts the characteristic quantity of self-produced zero sequence current and neutral point zero sequence current, proposes automatic detection method of TA polarity for zero sequence differential protection of generator transformer unit, and carries out dynamic simulation experiment and the field waveform playback test. The experimental results show that this method can automatically and accurately identify the polarity of neutral point zero sequence current transformer when the no-load step-up transformer is charged, greatly simplify the zero difference polarity verification process, which provides technical support for the wide application of zero sequence differential protection of generator transformer unit.

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Research on Security Sharing Technology of Power Engineering Detection Data Based on Blockchain and Attribute Encryption Technology

LI Rongsong, PENG lingyan, JIANG Cheng ,ZHANG Dingjun

2022, 42(3):  65-72.  doi:10.3969/j.issn.1008-0198.2022.03.012

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There are the problems of non-mutual trust, data opacity and easy disclosure in the process of witness sampling and detecting data sharing among the construction department, construction organization, supervision department, detecting department and other departments in power engineering quality management. In this paper, a power engineering detection data secure sharing scheme is proposed. In the scheme, all participating units form an alliance blockchain, and the engineering detection data generated by each unit are stored on and off the chain. In order to ensure data security and sharing, engineering detection data is encrypted into ciphertext, and ciphertext-policy attribute-based encryption (CP-ABE) is used to realize cross department sharing of ciphertext data.The overall scheme can effectively solve the problems of traceability, sharing and privacy protection, and promote the application of engineering detection blockchain.

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Research on Design of Short Circuit Grounding Wire for New Ultra High Voltage Transmission Line

ZHANG Enming, QIN Long, LIU Yongjiang, XU Zhaoshuai, JIN Xi

2022, 42(3):  73-77.  doi:10.3969/j.issn.1008-0198.2022.03.013

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In order to adapt to the rapid development of ultra high voltage transmission line and improving the efficiency of power engineering of all kinds of maintenance work, in view of the angle of a tower grounding resistance line articulated difficult situation, this paper states a new ground wire structure which is an optimal solution by checking the docking ground parts. The demo of model has been tested by safey experiments in real working situation.It finds that the new style structure of ground wire can be used by hand in a long distance and lose weight sharply. The result of research shows that the weight of the new grounding wire is 54% lower than that of the bar grounding wire, while it not only apply to tensioning corner tower, but also is used to change the length and section of grounding wire according to the needs. It has high practical value in application of different tower shapes and different voltage levels.

Experience and Discussion

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Analysis and Optimization Discussion on Control System Architecture of Electrochemical Energy Storage Power Station

HONG Quan, WU Jinbo, LI Li, LIU Zhihao, YANG Dan, GONG Yusheng

2022, 42(3):  78-82.  doi:10.3969/j.issn.1008-0198.2022.03.014

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With the continuous expansion of the scale of electrochemical energy storage power stations connected to the grid, the demand for unified control of receiving and dispatching to participate in grid peak shaving, frequency modulation, dynamic reactive power support and other multi-scenario applications is also increasing. This article combines the above requirements to analyze the current mainstream for the shortcomings of the technical route, discusses the improvement direction, and proposes a system improvement plan based on the 4S architecture , which can be used as a reference for the subsequent improvement of the energy storage control system.

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Influence of Mountain Wind Power Grid-Connected on Regional Network Supply Load

LUO Shuchen, WEN Ming, LI Wenying, LIAO Jing, XIAO Zhenfeng, YU Xuyang

2022, 42(3):  83-86.  doi:10.3969/j.issn.1008-0198.2022.03.015

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In order to study the influence of wind power intergrated on the load characteristics of connected load, the characteristics of wind power output are studied from the aspects of wind power daily power curve, annual output curve and daily maximum output. In addition, the influence of seasons on wind power output characteristics is also studied. Based on the above research on wind power output characteristics, by restoring the connected load, the impact of wind power on the connected load is compared and analyzed from the daily load characteristics, annual load characteristics and maximum load. It is pointed out that wind power would reduce the maximum load of the connected load and the average load of the connected load, and increase the peak-to-valley difference of the connected load.

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Comparative Analysis of Bearing Capacity Formula of Ring Prestressed Concrete Frame

ZHANG Yue, WANG Wenyuan, MAO Zhuoping, GONG Jiajun, LUO Jie

2022, 42(3):  87-91.  doi:10.3969/j.issn.1008-0198.2022.03.016

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Combined with an in-service substation in Hunan Province, the bearing capacity of the ring section prestressed concrete herringbone frame is calculated by using two specifications, namely Design Manual for Structural Gantry of Switchyard and Technical Code for the Design of Substation Buildings and Structures. The differences between the formulas for calculating the bearing capacity under compression, bending and tension under the two codes are analyzed from the aspects of application scope, calculation convenience and parameter concept. The results show that the proposed formula the latter covers a wider range and is more convenient to calculate, and the calculation results and numerical difference are discussed. In addition, two common design variables, pipe diameter and reinforcement number, are selected to discuss the influence of pipe diameter and reinforcement number on the bearing capacity of ring section herringbone frame. On the premise of increasing the bearing capacity of the frame to ensure safety, the design scheme with the highest economic benefit is selected based on the cost, so as to provide reference for the frame design of new substation and the replacement of the in-service concrete frame.

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Simulation Analysis of Impact of Distribution Photovoltaic Access on Relay Protection

HE Silin, MO Wenhui, LONG Xuemei, WANG Xiaoyuan, TANG Haiguo, YAN Yabing

2022, 42(3):  92-98.  doi:10.3969/j.issn.1008-0198.2022.03.017

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Under the circumstance of peak carbon dioxide emissions and carbon neutrality, various of challenges appear during conversion from conventional distribution system to new distribution system. The access of distributed photovoltaic(PV) changes the characteristic of single source and unidirectional power flow in distribution network. Current protection and reclosing can not longer adapt to new distribution system which integrates source, grid, load and storage. Based on the simplified topology of distribution network with distributed PV, the relative position between PV and fault is assorted. The impact on relay protection is evaluated via analyzing the transient characteristic of voltage and current under different types of fault. Modeling and simulation on RTDS validate the proposed analysis of impact, lastly methods as directional protection and setting value modifying are proposed to improve the reliability of relay protection.

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Design and Implementation of Electrical Equipment Test Data Transmission System

LI Dong, LI Yao, HUANG Hua, SHUAI Yong, WANG Lei

2022, 42(3):  99-103.  doi:10.3969/j.issn.1008-0198.2022.03.018

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In order to realize the electronic management of the field test data and the environmental test data of the traditional electrical equipment, and improve the test efficiency, the test data are printed by the printing equipment and analyzed into the text data, at the same time combining the environmental test data, it is transmitted through communication network and stored in mobile terminal, and the data is managed in the database of mobile terminal. The field test shows that the system can realize the electronic transmission and storage of test data, reduce the field test, and lay a foundation for data development and application.

Faults and Analysis

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Review on Fault Detection of Permanent Magnet Synchronous Motor

LUO Bing, PENG Sicheng, TAN Xuewu, WANG Tingting, CHENG Zhun

2022, 42(3):  104-108.  doi:10.3969/j.issn.1008-0198.2022.03.019

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This paper introduces the classification of magnetic loss fault and the characteristic curves of permanent magnet materials, analyzes the causes of magnetic loss, classifies and compares the existing magnetic loss fault detection at home and abroad, studies the detection of loss of excitation fault from different angles based on parameter identification. Finally, the prospect of magnetic loss fault detection is prospected.

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Analysis of A Ring Network Fault Caused by DC Wiring Error

GAO Yan

2022, 42(3):  109-112.  doi:10.3969/j.issn.1008-0198.2022.03.020

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The insulation level of DC system is often damaged due to aging of power cable insulation, damaged construction, damp accumulation and faulty wiring, which affects the safe and stable operation of units. In the light of the phenomenon that two sets of DC insulation monitoring devices are given an alarm at the same time but both sets of DC bus voltage are normal during the operation of unit 2 of a power plant, it is found that there is a loop network fault in the DC system, and this phenomenon is theoretically analyzed, the fault rules of DC system loop network are summarized, and some suggestions for reliable operation of DC system are put forward.