Existing Problems and Treatment Measures of Power Grid Dispatching and Safe Operation

2021 ◽  
Keyword(s):  
Power Grid ◽  
Safe Operation ◽  
Existing Problems ◽  
Treatment Measures

Analysis of Turbines Vibration and Treatment Measures during the Commissioning

2012 ◽  
Vol 591-593 ◽  
pp. 2087-2090
Author(s):  
Guo Cheng Fang
Keyword(s):  
Steam Turbine ◽  
Vibration Analysis ◽  
Power Grid ◽  
Difficult Problem ◽  
Stable Operation ◽  
Safe Operation ◽  
Power Station ◽  
Treatment Measures ◽  
Solid Foundation ◽  
Shaft Vibration

The phenomenon of higher shaft vibration and higher bearing temperature is repeated happening during the starting of the 1 000MW coal fired unit of Suizhong power station, seriously endanger the safe operation of the unit, this article mainly aims at the difficult problem of this one technology, by researching on steam turbine work principle and vibration analysis, to find the reason of effect on stability, and to correct all unreasonable factors, to ensure the safe and stable operation of the unit, to laid solid foundation for the construction of the intelligent power grid.

Type Synthesis of Torsional Mass Dampers as Anti-Galloping Devices by Using Planar Four-Bar Mechanisms

2012 ◽  
Vol 215-216 ◽  
pp. 285-288 ◽  
Author(s):  
Jia Lun Yang ◽  
Kuan Jun Zhu ◽  
Bin Liu
Keyword(s):  
Power Grid ◽  
Robotic Manipulators ◽  
Type Synthesis ◽  
Safe Operation

The type synthesis of torsional mass dampers (TMDs for short) as anti-galloping devices is very import for the safe operation of power grid. In this paper, the TMDs are considered as passive robotic manipulators, with the aim of introducing planar four-bar mechanisms into the synthesis of TMDs. By utilizing one planar four-bar mechanism or two planar four-bar mechanisms in a single TMDs, 6 TMDs with symmetrical structures and 18 TMDs with non-symmetrical structures are synthesized, which may improve the reasonable applications of the TMDs for the solving the anti-galloping issue of power grid.

Reliability Evaluation for the Main Electrical Wiring of Pumped-Storage Power Station Based on the GO Methodology

2014 ◽  
Vol 1030-1032 ◽  
pp. 574-578 ◽  
Author(s):  
Fu Liang Deng ◽  
Hai Sheng Liu ◽  
Shao Chen Wu
Keyword(s):  
Power Grid ◽  
Original Data ◽  
Reliability Evaluation ◽  
Power Station ◽  
Evaluation Indexes ◽  
Existing Problems ◽  
Go Methodology ◽  
Electrical Wiring ◽  
Pumped Storage ◽  
First Time

This paper introduced the function of the Pumped-Storage Power Station in power grid and the significance of reliability evaluation. Based on the principle of the GO method, the main electrical wiring’s reliability of the pumped-storage power station is proposed for the first time. According to the original data in references, the GO chart is established and the reliability is calculated and analyzed and evaluation indexes are put forward. The results show that the method is feasible. Finally it expounds the existing problems and shortcomings.

scholarly journals Study on icing and its trip laws of transmission lines in Shanxi Power Grid

2021 ◽  
Vol 252 ◽  
pp. 01055
Author(s):  
Bin Zhao ◽  
Li-chun Zhang ◽  
Jia-lun Yang ◽  
Kun-peng Ji
Keyword(s):  
Transmission Lines ◽  
Power Grid ◽  
Electric Energy ◽  
Energy Transmission ◽  
Safe Operation ◽  
Overhead Transmission Lines ◽  
Power Load ◽  
Capacity Improvement

Overhead transmission lines are important carriers of electric energy transmission. Their icing, galloping and shedding in winter and spring seriously threatened the safe operation of Shanxi power grid. Especially in the recent years, compact lines and double circuit lines on the same tower, typical types of overhead transmission lines in Shanxi Power Grid, were affected by frequent trips induced by icing, galloping, and shedding appeared in their conductors repeatedly, which seriously reduced the capacity of power energy transmission in Shanxi and caused trillions of power load losses. Through detailed investigation and analysis of the characteristics and historical fault cases of compact lines and double circuit lines on the same tower in Shanxi Power Grid, the key causes and main laws of two types of lines in Shanxi Power Grid are clarified, which could provide support for the follow-up line anti-ice technical transformation and capacity improvement.

Research Progress on Manual Ice Measurement Devices for Overhead Transmission Lines

2013 ◽  
Vol 765-767 ◽  
pp. 2272-2275
Author(s):  
Jia Lun Yang ◽  
Kuan Jun Zhu ◽  
Bin Liu ◽  
Jia Jun Si ◽  
Quan Yin ◽  
...  
Keyword(s):  
Transmission Lines ◽  
Wind Direction ◽  
Power Grid ◽  
Classification Criteria ◽  
Research Progress ◽  
Existing Problems ◽  
Overhead Transmission Lines ◽  
Different Types ◽  
Measurement Devices ◽  
Further Development

Sufficient icing data are very important for the design and operation of power grid in the places with potential accreted ice, meaning that it is necessary to pay due attention to the ice measurement devices. In this paper, the current ice measurement devices are classified into different types according to corresponding classification criteria with the aim of understanding the characteristics of each type of devices. Moreover, the research progress of the manual ice measurement devices are introduced in detail, including the diameter of conductors, the angle between conductor and wind direction. Finally, the existing problems are proposed for the further development of manual ice measurement devices for overhead transmission lines.

scholarly journals Research on risk assessment method of distribution network based on information physical fusion

2021 ◽  
Vol 248 ◽  
pp. 02055
Author(s):  
Wei Wei Xu ◽  
Feng Chen ◽  
Bao Zhang ◽  
Jun Hao Huang ◽  
Tao Yang
Keyword(s):  
Risk Assessment ◽  
Power Grid ◽  
Distribution Network ◽  
Assessment Method ◽  
Safe Operation ◽  
Information Level ◽  
Risk Assessment Method ◽  
Failure Scenario ◽  
Coupling Characteristics ◽  
Grid Based

With the improvement of information level, the information attack will cross the boundary of power grid information space and cause the disturbance of power grid physical system, which will form a cross-space chain fault and affect the safe operation of power grid. Based on this, this paper proposes a distribution network node risk assessment method based on information physical fusion. Firstly, the overall structure of the distribution network and the information physical coupling characteristics of the information physical fusion are studied. Then, the cross-space chain failure scenario of distribution network with information physical fusion is analyzed. Based on this, the risk assessment method is proposed. Finally, the effectiveness of the method is verified by a numerical example.

scholarly journals Influence of HVDC Transmission on DC Bias of AC Grid and Its Treatment

2021 ◽  
Author(s):  
Ruifeng Zhan ◽  
Yuying Hu ◽  
Fan Li ◽  
Zhou Mi ◽  
Lingpeng Dong
Keyword(s):  
High Voltage ◽  
Direct Current ◽  
Power Grid ◽  
Hvdc Transmission ◽  
High Voltage Direct Current ◽  
Grid Topology ◽  
Treatment Measures ◽  
Calculation Results ◽  
Transformer Winding ◽  
Dc Bias

With the rapid development of China’s electric power industry, the high-voltage and long-distance direct current (DC) transmission effectively solved the problem of uneven power distribution. When the high voltage direct current transmission is in unipolar operation or bipolar asymmetric operation, part of the DC current will flow into the transformer winding through the grounded neutral point, which will cause the DC bias problem. This article used CDEGS software for modeling, and introduced the process of CDEGS software for DC bias simulation modeling. In this paper, the DC bias model of regional power grid is first established, based on the Zhejiang power grid topology and the test soil resistivity date. Then the DC bias currents of the transformers are calculated, and finally the corresponding treatment measures are proposed. According to the governance measures, this article adjusted the simulation model. The calculation results show that the treatment measures have good effects, which can provide an important reference for the future treatment of transformer DC bias.

scholarly journals Design of Power Communication Data Network Management System and Implementation of Data Acquisition Module

2021 ◽  
Vol 5 (6) ◽  
pp. 1-5
Author(s):  
Yue Zhang ◽  
Zefeng Jian ◽  
Hao Wang
Keyword(s):  
Communication Network ◽  
Data Acquisition ◽  
Network Management ◽  
Management System ◽  
Power Grid ◽  
Network Management System ◽  
Safe Operation ◽  
Data Network ◽  
Management Architecture ◽  
Data Acquisition Module

The power communication network is a separate network from the power grid whose primary purpose is to ensure the power grid's safe operation. This paper expounds the composition of the comprehensive network management architecture of the power communication data network and the implementation of the data acquisition module in the network management system through theoretical analysis, for the reference of relevant personnel, in order to better promote the collection of power grid communication network data.

Field DC Voltage Withstand Test of Submarine Cable in Hainan Grid Connection Project

2013 ◽  
Vol 441 ◽  
pp. 217-222
Author(s):  
Xiao Long Luo ◽  
Rui Bie ◽  
Liang Zhang ◽  
Wei Chen ◽  
You Ping Fan
Keyword(s):  
Power Grid ◽  
Field Trials ◽  
Submarine Cable ◽  
Safe Operation ◽  
Dc Voltage ◽  
Grid Connection ◽  
Safety And Reliability ◽  
Core Part ◽  
Insulation Condition ◽  
Major Project

500kV Hainan Grid Connection project is the major project connecting Hainan Power Grid to Main China southern power grid. Submarine cable segment is a core part of the whole project. The safety and reliability of the whole project is directly determined by the situation of its main insulation. The submarine cable is affected by a variety of factors in the sectors of manufacturing, transportation and installation. Field voltage withstand test on the submarine cable is of great significance in order to check its insulation condition after installation. In this paper, field DC voltage withstand test of 500kV oil-filled submarine cable is researched. The data obtained in field trials is analyzed to evaluate the main insulation reliability. The results show that the manufacturing quality and the insulation condition installation after laying on site of the submarine cable is reliable, meeting the engineering requirements of safe operation.

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