Intelligent Control Technology of Ultra-High Voltage Grid

2019 ◽  
Vol 23 (1) ◽  
pp. 67-71
Author(s):  
Yan Li ◽  
Keyword(s):  
Intelligent Control ◽  
High Voltage ◽  
Control Method ◽  
Current Method ◽  
Control Technology ◽  
Power Frequency ◽  
Grid Construction ◽  
The Stability ◽  
Poor Stability ◽  
Ultra High Voltage

In order to ensure the stability and economy of ultra-high voltage grid in construction, we need to research the intelligent control method of ultra-high voltage grid. Using current method in ultra-high voltage grid construction, there is a problem of poor stability. Therefore, this paper proposed an intelligent control method of ultra-high voltage grid. This method analyzed the transmission capacity of power grid and electromagnetic loop operation, and used the genetic algorithm to compute the optimization model, finally analyzed the stability of the power frequency voltage completing the intelligent control of ultra-high voltage grid. Experimental results show that this method has high practical value.

Research on Microgrid Frequency Control With Droop Characteristic Based on Lagrange Interpolation

2014 ◽  
Vol 556-562 ◽  
pp. 1814-1817
Author(s):  
Jia Ming Li ◽  
Peng Li
Keyword(s):  
Lagrange Interpolation ◽  
Control Method ◽  
Frequency Control ◽  
Active Power ◽  
Droop Control ◽  
Power Frequency ◽  
Droop Characteristic ◽  
The Stability

The operating status of the microgrid is given, currently three classic control modes of microgrid isintroduced. And a method is put forward, which is a improved active power-frequency droop control method based on Lagrange interpolation.This method can effectively guarantee the stability of the microgrid running frequency. The correctness of the method is confirmed through the simulation.

scholarly journals Stability of Close Chambers Surrounding Rock in Deep and Comprehensive Control Technology

2018 ◽  
Vol 2018 ◽  
pp. 1-18 ◽  
Author(s):  
Weijian Yu ◽  
Fangfang Liu
Keyword(s):  
Control Method ◽  
Large Diameter ◽  
High Stress ◽  
Surrounding Rock ◽  
Rock Deformation ◽  
Control Technology ◽  
Internal Damage ◽  
Anchor Cable ◽  
The Stability ◽  
And Control

The purpose of this paper is to solve the problem that deep and close-distance cavern and roadway group were easily affected by the adjacent chamber or roadway excavation disturbance and low stability and significant deformation of surrounding rock occurred. The stability and control technology of surrounding rock in the main shaft and auxiliary shaft system has been analyzed by the adjacent chamber and roadway group of −850 m level in Qujiang Mine, China, as an engineering background. Firstly, the numerical calculation of the excavation chamber was, respectively, carried out in different ways with the propagation theory of the excavation disturbance wave. The results show that the interaction of adjacent chamber excavation was more intense. When excavated at the same time, there is a large increase in the movement of the sides and the roof-floor of the chamber and roadway. Then, the mechanism of interaction between low-high stress and excavation disturbance was considered, the corresponding control principles were provided, and a set of critical technologies and equipment were designed according to the deformation characteristics of the large deformation soft surrounding rock. Finally, the comprehensive control method was put forward with the water pump house as an example, that is, anchor, metal net, grouting, combined anchor cable and large-diameter anchor cable. And the related support parameters were determined by the internal damage of the surrounding rock chamber. The numerical simulation results show that the surrounding rock deformation of the chamber and roadway reduced with the revised support program, which the expansion of the rock mass loose circle prevented effectively. The site test shows that the convergence rate of surrounding rock with the improved support was less than 0.2 mm/d, and the rock deformation of chamber and roadway suppressed significantly.

Power-Frequency Electric Field Calculation of Ultra-High Voltage Substation

2013 ◽  
Vol 448-453 ◽  
pp. 2132-2136
Author(s):  
Guo Wei Cai ◽  
Yi Gong Wang ◽  
Dong Han ◽  
Wen Guo Song
Keyword(s):  
Electric Field ◽  
High Voltage ◽  
Current Model ◽  
Normal Operation ◽  
Field Calculation ◽  
Proposed Model ◽  
Power Frequency ◽  
Frequency Electric Field ◽  
Simulation Results ◽  
Ultra High Voltage

To ensure the normal operation, calculation of electric field in ultra-high voltage substation is particularly important. A line model is proposed to simplify current model and improve computational efficiency. Combining this model with boundary element method, this article described a method to calculate the electric field at the vicinity of complex equipment of ultra-high voltage substation. An actual substation environment is also simulated, with detailed analysis of simulation results, proposed model and method are verified as valid and effective.

Study on Selective Leakage Protection System of Mine High Voltage Grid Based on Harmonic Phase Comparison

2015 ◽  
Vol 9 (1) ◽  
pp. 253-262
Author(s):  
Liu Zhongfu ◽  
Zhang Junxing ◽  
Shi Lixin ◽  
Yang Yaning
Keyword(s):  
High Voltage ◽  
Power Supply ◽  
Power Supply System ◽  
Supply System ◽  
Neutral Point ◽  
Arc Suppression Coil ◽  
Zero Sequence ◽  
Harmonic Extraction ◽  
Power Direction ◽  
The Stability

As for the wide application of arc suppression coil to the grounding in neutral point of mine high voltage grid, grid leakage fault rules and harmonic characteristics of the neutral point grounding system through arc suppression coil are analyzed, the selective leakage protection program “zero-sequence voltage starts, fifth harmonics of grid zerosequence voltage and zero-sequence current are extracted for phase comparison” is proposed, and corresponding fifth harmonic extraction circuit and power direction discrimination circuit are designed. The experimental results show that the protective principle applies not only to the neutral point insulated power supply system, but also to the power supply system in which neutral point passes arc suppression coil, which can solve selective leakage protection problems under different neutral grounding ways, improving the reliability of selective leakage and guaranteeing the stability of the action value.

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