Dispatching Technology Application in India Large Scale Blackout

2014 ◽  
Vol 716-717 ◽  
pp. 1409-1412
Author(s):  
Jia Yin Sui ◽  
Min Zhao ◽  
Wei Yue Zhou ◽  
Peng Jin
Keyword(s):  
Dynamic Analysis ◽  
High Voltage ◽  
Large Scale ◽  
Defense Mechanism ◽  
Power Grid ◽  
Safety Evaluation ◽  
Technology Application ◽  
Network Defense ◽  
Large Scope ◽  
Grid Construction

Scheduling technology plays an important role in avoiding the occurrence of large scope blackout. India "7.30", "7.31" blackout indicates dispatching mechanism is not reasonable. It is more important that it violates scheduling and supervision direction. The network defense mechanism is not perfect. It is lack of dynamic analysis and safety evaluation capacity. Dispatching technology can be a basis for China's high-voltage power grid construction, dispatching management and establishing a perfect accident recovery plan.

A Novel Method of Static Security Analysis Based on Multithread Technology

2013 ◽  
Vol 732-733 ◽  
pp. 639-645
Author(s):  
Bi Qiang Tang ◽  
Yi Jun Yu ◽  
Shu Hai Feng ◽  
Feng Li
Keyword(s):  
Power Systems ◽  
Large Scale ◽  
Power Grid ◽  
Security Analysis ◽  
Power Grids ◽  
Long Time ◽  
Grid Construction ◽  
Static Security ◽  
Bulk Power ◽  
Grid Operation

With the UHV (Ultra High Voltage) power grid construction and the interconnection of regional power grids, the scale of power grids in China is increasing rapidly. At the same time, significant uncertainty and variability is being introduced into power grid operation with the integration of large-scale renewable energy in power systems. All of these pose an enormous challenge to the operation control of power systems in China. For a long time, online static security analysis, as an important part of EMS (Energy Management System), has been an effective tool for power grid operation. However, it is increasingly difficult for traditional static security analysis in serial computing mode to be online applied in bulk power grids in China. A new practical parallel approach for online static security analysis is put forward in this paper. A multithread parallelism is introduced into contingency screening, detailed contingency evaluation and decision support for reducing the execution time. By employing the multithread technology, the hardware resources of multi-processor/multi-core computer can be fully used and the program can be speeded up effectively. The performance of the parallel static security analysis is demonstrated by tests on two large-scale power systems. The test results show that the proposed method can be online applied in real bulk power grids.

Discussion on Relay Protection and Safety Planning of Intelli- gent High Voltage Grid

2019 ◽  
Vol 4 (1) ◽  
pp. 25-26
Author(s):  
Jianquan Zhang ◽  
Keyword(s):  
High Voltage ◽  
Large Scale ◽  
Power Grid ◽  
Relay Protection ◽  
Automatic Device ◽  
Normal Operation ◽  
Large Current ◽  
Basic Work ◽  
Actual Operation ◽  
Abnormal Operation

In the related work of power grid safety, safety protection can be said to be a very basic work. Nowadays, with the continuous development of science and technology in China, a large-scale smart high-voltage power grid has been formed. In the actual operation of smart high-voltage power grid, if the safety automatic device owned by it has an accident, it is very easy to cause abnormal operation of the system, wrong operation and other situations, thus destroying the working performance of the power grid equipment. When there is a large current passing through the system in a short time, the relay protection device will be triggered, which will seriously affect the normal operation of the power grid.

A Computer Network Defense-Oriented Scheme Description Language

2013 ◽  
Vol 765-767 ◽  
pp. 1739-1742
Author(s):  
Wei Zhao ◽  
Chun He Xia ◽  
Yang Luo ◽  
Xiao Chen Liu ◽  
Wei Kang Wu
Keyword(s):  
Large Scale ◽  
Defense Mechanism ◽  
Computer Network ◽  
Description Language ◽  
Network Defense ◽  
Detection Analysis ◽  
Policy Description Language ◽  
As Relationship ◽  
Detailed Technique ◽  
Computer Network Defense

Existing defense policy description language can describe some aspects of defense only, such as protection or detection but cannot express relationship among actions. Thus, it cannot accomplish a joint defense goal with the linkage of all kinds of defense mechanism for large-scale, distributed network attacking, such as Botnet. To solve this problem, we proposed a computer network defense-oriented scheme description language (CNDSDL), which can describe protection, detection, analysis, response, and recover actions as well as relationship among actions. These relations include sequence-and, sequence-or, concurrent-and, concurrent-or, and xor. It provides a unified coupling language description for linkage defense of different security devices. At last, we realized the simulation of schemes which are described by CNDSDL. The experiments results show that CNDSDL can be transformed to detailed technique rules and realize the defense effect of expression.

Parameters of the Plasma of a Large-Scale High-Voltage Discharge in Air at Reduced Pressures

2019 ◽  
Vol 45 (6) ◽  
pp. 527-536 ◽  
Author(s):  
A. V. Strikovskiy ◽  
S. V. Korobkov ◽  
M. E. Gushchin ◽  
A. A. Evtushenko ◽  
I. Yu. Zudin
Keyword(s):  
High Voltage ◽  
Large Scale ◽  
High Voltage Discharge ◽  
Reduced Pressures

scholarly journals Analysis of Subsynchronous Torsional of Wind–Thermal Bundled System Transmitted via HVDC Based on Signal Injection Method

Energies ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 474
Author(s):  
Junxi Wang ◽  
Qi Jia ◽  
Gangui Yan ◽  
Kan Liu ◽  
Dan Wang
Keyword(s):  
Wind Power ◽  
High Voltage ◽  
Direct Current ◽  
Computer Aided Design ◽  
Large Scale ◽  
Electromagnetic Transients ◽  
Torsional Mode ◽  
High Voltage Direct Current ◽  
Operation Conditions ◽  
Signal Injection

With the development of large-scale new energy, the wind–thermal bundled system transmitted via high-voltage direct current (HVDC) has become the main method to solve the problem of wind power consumption. At the same time, the problem of subsynchronous oscillation among wind power generators, high-voltage direct current (HVDC), and synchronous generators (SGs) has become increasingly prominent. According to the dynamic interaction among doubly fed induction generators (DFIGs), HVDC, and SGs, a linearization model of DFIGs and SGs transmitted via HVDC is established, and the influence of the electromagnetic transient of wind turbines and HVDC on the electromechanical transient processes of SGs is studied. Using the method of additional excitation signal injection, the influence of the main factors of DFIG on the damping characteristics of each torsional mode of SG is analyzed, including control parameters and operation conditions when the capacity of HVDC is fixed. The mechanism of the negative damping torsional of SGs is identified. A time-domain simulation model is built in Electromagnetic Transients including DC/Power Systems Computer Aided Design (EMTDC/PSCAD) to verify the correctness and effectiveness of the theoretical analysis.

scholarly journals Development and Validation of a Post-Earthquake Safety Assessment System for High-Rise Buildings Using Acceleration Measurements

Mathematics ◽  
2021 ◽  
Vol 9 (15) ◽  
pp. 1758
Author(s):  
Koji Tsuchimoto ◽  
Yasutaka Narazaki ◽  
Billie F. Spencer
Keyword(s):  
Safety Assessment ◽  
Large Scale ◽  
Model Updating ◽  
Safety Evaluation ◽  
Assessment System ◽  
Shaking Table ◽  
Structural Safety ◽  
High Rise ◽  
Steel Building ◽  
Earthquake Safety

After a major seismic event, structural safety inspections by qualified experts are required prior to reoccupying a building and resuming operation. Such manual inspections are generally performed by teams of two or more experts and are time consuming, labor intensive, subjective in nature, and potentially put the lives of the inspectors in danger. The authors reported previously on the system for a rapid post-earthquake safety assessment of buildings using sparse acceleration data. The proposed framework was demonstrated using simulation of a five-story steel building modeled with three-dimensional nonlinear analysis subjected to historical earthquakes. The results confirmed the potential of the proposed approach for rapid safety evaluation of buildings after seismic events. However, experimental validation on large-scale structures is required prior to field implementation. Moreover, an extension to the assessment of high-rise buildings, such as those commonly used for residences and offices in modern cities, is needed. To this end, a 1/3-scale 18-story experimental steel building tested on the shaking table at E-Defense in Japan is considered. The importance of online model updating of the linear building model used to calculate the Damage Sensitive Features (DSFs) during the operation is also discussed. Experimental results confirm the efficacy of the proposed approach for rapid post-earthquake safety evaluation for high-rise buildings. Finally, a cost-benefit analysis with respect to the number of sensors used is presented.

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