Internal comprehensive power supply system of large-scale coal-electricity integrated power station

Abstract

The invention discloses an internal comprehensive power supply system of a large-scale coal-electricity integrated power station. The internal comprehensive power supply system comprises two units anda half-wiring high-voltage power distribution device, and a main transformer of each unit is connected with the half-wiring high-voltage power distribution device through a conductor. The internal comprehensive power supply system is characterized in that a generator outlet circuit breaker is arranged at the outlet of each unit generator in the coal-electricity integrated power plant, an on-loadvoltage regulation high-voltage splitting plant transformer and a coal mine power supply on-load voltage regulation transformer are arranged at the side of the power plant, and a high-voltage side power supply is taken from the outlet of the generator. The medium-voltage station service power bus sections of the two units of the power plant are interconnected, two medium-voltage power bus sectionsin a coal mine are interconnected, and power supplies are standby for each other. According to the invention, the high-voltage station service power wiring of the power plant and the coal mine is greatly simplified, the flexibility of the electrical operation of the power plant and the coal mine is improved, and the occupied area of the overhead lines and devices is saved.

Description

technical field [0001] The invention belongs to the field of coal-fired thermal power generation, and relates to the improvement of a large-scale coal-electricity integrated power plant and an internal integrated power supply system of a coal mine. Background technique [0002] The coal used for thermal power generation in my country accounts for more than 50% of the industrial coal. Building power plants near coal mines not only reduces fuel transportation costs, but also alleviates the contradiction between coal and electricity. The coal-electricity integration project means that the coal mine and the power plant are funded and constructed by the same investor. During the construction process, the related facilities of the coal mine and the power plant are considered as a whole to avoid redundant construction. After the completion, the coal mine and the power plant are managed in a unified manner. Due to the low power generation cost of coal-electricity integrated power p...

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Problems solved by technology

[0004] At present, because the electrical parts of the power plant and coal mine in the large-scale coal-electricity integrated power plant are designed by different units, the electrical power supply of the two parts is not really considered as a whole, the power supply is redundant and inflexible, and some systems have redundant construction

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