1140V three-level anti-explosion reactive compensation device

Abstract

The invention discloses an 1140V three-level anti-explosion reactive compensation device which comprises a switch starting module (3), a three-level power module (4) and a control protecting module (5). A three-level active neutral point clamped type power converter is used in a main circuit of the three-level power module (4). An 1140V alternating current bus (1) is connected into the input end of the switch starting module (3), and the output end of the switch starting module (3) is connected with the input end of the three-level power module (4). Current and voltage sampling signals collected in a bus voltage sensor (6), a bus current sensor (7) and the three-level power module (4) are respectively transmitted to the control protecting module (5), and control signals output by the control protecting module (5) drive the three-level active neutral point clamped type power converter in the three-level power module (4). The 1140V three-level anti-explosion reactive compensation device is strong in voltage flicker restraining capacity, has strong short-time overload capacity and is suitable for reactive compensation of the underground of a coal mine due to the fact that the reactive compensation capacity is not influenced by bus voltages.

Description

technical field [0001] The invention discloses a 1140V three-level explosion-proof reactive power compensation device, in particular to a three-level active midpoint clamping converter, which belongs to the field of power system reactive power compensation. Background technique [0002] With the development of coal mine production technology, the equipment level of the fully mechanized mining face has been rapidly improved, and the high-power equipment and total installed capacity have continued to increase. 1140V fully mechanized mining and excavation equipment has become more common. High-power equipment in underground coal mines must meet the special engineering requirements of underground coal mines, especially explosion-proof and heat dissipation requirements. The reactive power exchange between various inductive loads and the power supply in the coal mine underground working face continues to increase, and the power factor decreases, resulting in a continuous decline i...

AI Technical Summary

Problems solved by technology

Since these two modes adopt hierarchical fixed capacity compensation, they cannot dynamically track the reactive power changes of the load, and are not suitable for the characteristics of frequent start and stop of coal mine production equipment and large load changes. In addition, the frequent switching of reactors and capacitors with contact switches is easy to generate electricity. Sparks are not conducive to explosion protection requirements

At present, most of the common reactive power compensation devices in coal mines are 660V and 1140V voltage levels, and there are few explosion-proof reactive power compensation devices (SVG) with 1140V voltage levels.

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