Dynamic Simulation System of Power Supply and Distribution System in Coal Mine

Abstract

The invention discloses a coal mine power supply and distribution dynamic analog system. The system comprises a high-voltage supply circuit and a low-voltage feed circuit, and a magnetic powder brake for artificial load and a fault analog circuit connected with the high-voltage feed circuit or the low-voltage feed circuit, wherein the high-voltage supply circuit is connected with a 380V mains supply transmission line; the low-voltage feed circuit comprises a voltage-reduction circuit and a low-voltage feed branch connected with the voltage-reduction circuit, and a harmonic source connected with the voltage-reduction circuit and the low-voltage feed branch; the magnetic powder brake is connected with the low-voltage feed branch; the high-voltage supply circuit comprises a boosting transformer T1, a high-voltage supply line and a zero sequence electric reactor ARC; the pressure-reduction circuit is composed of a voltage-reduction transformer T2; the fault analog circuit comprises a gradually-changed leakage analog circuit and a short-circuit analog circuit. The invention further discloses a coal mine power supply and distribution system dynamic analog method. The method and the system disclosed by the invention have the flexible and dynamic modeling capacity, the dynamic analog result is strong in truth and practicability, and the use effect is good.

Description

technical field [0001] The invention belongs to the technical field of power supply and distribution safety in coal mines, and in particular relates to a dynamic simulation system for power supply and distribution systems in coal mines. Background technique [0002] Underground coal mine is a typical explosive environment, and its power supply system generally adopts the operation mode of non-effective neutral point grounding. Due to the harsh electricity environment of the mine, the power supply lines and equipment of the working face are prone to leakage, grounding, short-circuit and other faults. The high temperature and electric sparks caused by the faults are the main fire sources leading to explosion accidents. Once an explosion occurs, it will directly threaten the entire The life safety of underground workers, and cause bad social impact and major economic losses, so coal mine production has high requirements for the safety and reliability of power supply. Various p...

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Problems solved by technology

[0003] Due to the large difference in operating characteristics between the mine power supply system and the ground power supply system, there is currently no dynamic simulation system that can effectively address the uniqueness of mine power supply

There are mainly two methods for the existing simulation system. One is to use various commercial simulation software to build a numerical model of the mine power supply system on the computer, and to complete the simulation and experiment by solving differential equations. This simulation environment is completely ideal. It is simple to build under the ground, but it is very different from the actual operating conditions of the underground power supply system. Many faults with gradual changes and the dynamic physical characteristics of the equipment cannot be simulated. The simulation results can only be used as a preliminary understanding of the mine power supply system. refer to

The second simulation system uses 380V as the experimental voltage. The experimental system does not include actual equipment such as transformers, transformers, and loads. Although the simulation results are better than computer simulations, they are still far from the actual situation.

Mine mainly adopts 10kV and 3300V power supply voltages, and the length of insulation life is mainly related to the voltage level. The difference in voltage level has a great influence on the insulation performance of equipment, especially cables, which directly leads to the research on the occurrence and evolution of leakage faults. big error

For the inspection and testing of relay protection devices, it is necessary to comprehensively consider the dynamic operating conditions of the system, the saturation characteristics of transformers and transformers, and the comprehensive impact of load changes on electrical equipment, which cannot be realized in the 380V experimental system

[0004] Due to the lack of a real mine dynamic simulation system, the inspection of the performance of mine equipment ultimately depends on the actual application in the mine, and the research and understanding of the operation law of the mine power supply system and the mechanism of various failures can only be done through simulation software or on the ground. The low-voltage experimental system is simulated, so mine power supply equipment failures occur frequently, the reliability of the protection system is not high, and it is inevitable that the safety of coal mine power supply cannot be effectively guaranteed. The basic theoretical research on power supply safety in explosive environments is always in a relatively weak state

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