A control method for a 3300v five-level explosion-proof reactive power compensation device

Abstract

The invention discloses a control method for a 3300V five-level anti-explosion reactive power compensation device. Voltage and current double closed-loop feedback control is adopted, current loop control is adopted in an inner ring, voltage loop control is adopted for an outer ring, current instantaneous values sent by the reactive power compensation device are turned into i<d> and i<q> by dq coordinate transformation; after a direct current side voltage reference value is compared with a direct current side capacitor voltage feedback value, an active current reference value is obtained through a PI regulator; after i<d> and i<q> are compared with the active current reference value i<dref> and a reactive current reference value i<qref>, v<d> and v<q> are obtained through the PI regulator; v<d> and v<q> are subjected to dq inverse transformation, and three-phase voltage signals are obtained; after the three-phase voltage signals are subjected to a sine pulse width modulation control algorithm, pulse width modulation (PWM) control signals are sent out; and the PWM control signals drive a five-level active midpoint clamping type power converter through an insulated gate bipolar transistor (IGBT) driving circuit. According to the control method, continuous, smooth, dynamic and rapid inductive-to-capacitive reactive power compensation can be provided, the control method adapts to tracking of an impact load, and harmonic waves can be subjected to wide-amplitude active filtering.

Description

technical field [0001] The invention discloses a control method of a 3300V five-level explosion-proof reactive power compensation device, in particular to a control method of a five-level active neutral point clamp type converter, which belongs to the field of power system reactive power compensation. Background technique [0002] With the development of coal mine production technology, the level of fully mechanized mining face equipment has been rapidly improved, and the total installed capacity of high-power equipment and installed capacity has continued to increase. 3300V fully mechanized mining and excavation equipment has become more common. The high-power equipment in the coal mine must meet the special engineering requirements of the coal mine, especially the explosion-proof and heat dissipation requirements. The traditional mining reactive power compensation technologies mainly include mechanical group switching capacitors (MSC) and thyristor group switching capacito...

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, the common reactive power compensation devices in coal mines are mostly 660V and 1140V voltage levels, and there are few explosion-proof reactive power compensation devices with 3300V voltage levels.

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