CN202663350U - A Mine Hoist Speed Regulation Control System Based on Multilevel Matrix Frequency Converter - Google Patents

Abstract

A mine hoist speed governing control system based on many level matrix converter is connected with electric wire netting and wound-rotor type asynchronous machine respectively, includes: the device comprises a multilevel matrix frequency converter, an A/D sampling module and a vector control system. One side of the multi-level matrix frequency converter is connected with a power grid, and the other side of the multi-level matrix frequency converter is directly connected with a three-phase stator of an asynchronous motor to carry out alternating-alternating direct frequency conversion and rotating speed control, so that high-performance speed regulation control of the mine hoist is realized, and the multi-level matrix frequency converter further comprises a 9 xn cascade unit module matrix. The A/D sampling module is connected with the multi-level matrix frequency converter and used for collecting the rotating speed, current and voltage parameters of the motor. The vector control system is respectively connected with the multilevel matrix frequency converter and the A/D sampling module and used for providing stator voltage vector signals required by the speed regulation of the asynchronous motor according to the rotating speed, current and voltage parameters collected by the A/D sampling module. The utility model has the advantages of can realize energy bidirectional flow, the input side power factor is adjustable, and input current harmonic is little, the energy consumption is low and easily integrated.

Description

A Mine Hoist Speed Regulation Control System Based on Multilevel Matrix Frequency Converter

technical field

The utility model relates to the application field of a wire-wound asynchronous motor speed regulating device in a mine hoist, in particular to a mine hoist speed regulating control system based on a multilevel matrix frequency converter. the

Background technique

In the mine hoist in our country, due to the advantages of simple structure, compactness, firmness and large capacity of the winding asynchronous motor, the speed regulation mode of the winding asynchronous motor driving the mine hoist is widely used. At present, most of this type of hoist adopts winding asynchronous motor rotor series resistors for speed regulation, using different combinations of resistance in the rotor circuit to make the motor run on different mechanical characteristic curves, so as to achieve the purpose of speed regulation, but it has the function of regulating Poor speed performance, high energy consumption, heavy maintenance workload, uneconomical operation and other disadvantages. the

Utility model content

The utility model aims at the above-mentioned deficiencies in the prior art, and provides a mine hoist speed regulation control system based on a multi-level matrix frequency converter, which combines the H-bridge cascade frequency conversion technology with the matrix frequency conversion speed regulation technology, A new AC/AC direct frequency conversion speed control system for mine hoists driven by winding asynchronous motors has been formed. This system has the characteristics of realizing bidirectional energy flow, adjustable input side power factor, small input current harmonics and low energy consumption. . the

In order to achieve the above object, the utility model is realized through the following technical solutions:

A mine hoist speed regulation control system based on a multi-level matrix inverter, which is respectively connected to the power grid and a wound asynchronous motor, including: a multi-level matrix inverter, an A/D sampling module and a vector control system, wherein,

One side of the multi-level matrix frequency converter is connected to the power grid, and the other side is directly connected to the three-phase stator of the asynchronous motor to perform AC-AC direct frequency conversion and speed control to realize high-performance mine hoist speed control, which further includes 9×n levels Link unit module matrix;

The A/D sampling module is connected with the multi-level matrix inverter to collect the parameters of the motor's speed, current and voltage;

The vector control system is respectively connected with the multi-level matrix inverter and the A/D sampling module to give the stator voltage vector signal required for the speed regulation of the asynchronous motor according to the parameters of the rotational speed, current and voltage collected by the A/D sampling module . the

According to the mine hoist speed regulation control system based on the multi-level matrix frequency converter described in the preferred embodiment of the present invention, its 9×n cascaded unit module matrix includes 9 bridge arms, and each bridge arm is composed of N low-voltage H-bridge frequency conversion modules are cascaded, and the cascaded bridge arm is a 3×3 matrix array. The three-phase input terminal on one side of the array is connected to the power grid, and the three-phase output terminal on the other side is directly connected to the three-phase asynchronous motor. The stator is connected. the

According to the mine hoist speed regulation control system based on the multi-level matrix frequency converter described in the preferred embodiment of the present invention, its low-voltage H-bridge frequency conversion module further includes a low-voltage H-bridge frequency conversion unit, a sub-A/D sampling module and a trigger pulse control module, where

The low-voltage H-bridge frequency conversion unit is a bridge-type single-phase inverter composed of four IGBT switches and electrolytic capacitors;

The sub-A/D sampling module is connected with the low-voltage H-bridge frequency conversion unit to collect the capacitor voltage;

The trigger pulse control module is respectively connected with the low-voltage H-bridge frequency conversion unit and the sub-A/D sampling module to communicate with the vector control system, transmit voltage information, receive control signals of the vector control system, and drive 4 IGBT switches. the

The utility model adopts the vector control technology of the asynchronous motor, decomposes the stator current into the excitation component and the torque component, and controls them respectively, so as to achieve the closed-loop control of the rotating speed. Compared with the prior art, the beneficial effect of the utility model is: adopting the modular design, it is convenient to expand according to different system capacities, and at the same time, the redundant design makes maintenance more convenient; compared with the traditional two-level and three-point Flat output, the harmonic content of multi-level output is greatly reduced, the harmonic of the speed control system is reduced, and the power factor of the input side is improved, and the output current is continuous, which improves the lifting efficiency of the mine hoist and reduces the traditional winding. Energy consumption of wire motor rotor series resistance speed regulation mode. the

Description of drawings

Fig. 1 is a topology structure diagram of a mine hoist speed regulation control system based on a multi-level matrix frequency converter of the utility model;

Fig. 2 is the structural representation of the low voltage H bridge frequency conversion unit of the utility model embodiment;

Fig. 3 is a schematic diagram of the main circuit of the multi-level matrix frequency conversion speed regulation system of the embodiment of the utility model. the

Detailed ways

The structure and principle of a mine hoist speed regulation control system based on a multi-level matrix frequency converter provided by the utility model patent will be explained in detail below in conjunction with the accompanying drawings. the

Please refer to Fig. 1 to Fig. 2 at the same time, a mine hoist speed regulation control system based on multi-level matrix inverter, which is respectively connected with power grid 4 and wound asynchronous motor 5, including: multi-level matrix inverter 1, A/D sampling module 2 and vector control system 3. One side of the multi-level matrix inverter 1 is connected to the power grid 4, and the other side is directly connected to the three-phase stator of the asynchronous motor 5 to perform AC-AC direct frequency conversion and speed control to realize high-performance mine hoist speed control, which includes 9 ×n cascaded unit module matrix, and the 9×n cascaded unit module matrix includes 9 bridge arms, each bridge arm is formed by cascading N low-voltage H-bridge frequency conversion modules, and the cascaded bridge arm is 3×3 In a matrix array, the three-phase input terminal on one side of the array is connected to the grid 4 , and the three-phase output terminal on the other side is directly connected to the three-phase stator of the asynchronous motor 5 . The A/D sampling module 2 is connected with the multi-level matrix frequency converter 1, and is used for collecting parameters of the rotational speed, current and voltage of the motor. The vector control system 3 is respectively connected with the multi-level matrix frequency converter 1 and the A/D sampling module 2, and is used to provide the speed regulation required for the asynchronous motor according to the parameters of the rotational speed, current and voltage collected by the A/D sampling module 2. Stator voltage vector signal. the

The low-voltage H-bridge frequency conversion module further includes a low-voltage H-bridge frequency conversion unit 6 , a sub-A/D sampling module 7 and a trigger pulse control module 8 . The low-voltage H-bridge frequency conversion unit 6 is a bridge-type single-phase inverter composed of four IGBT switches and electrolytic capacitors. The sub-A/D sampling module 7 is connected with the low-voltage H-bridge frequency conversion unit 6 to collect capacitor voltage. The trigger pulse control module 8 is respectively connected with the low-voltage H-bridge frequency conversion unit 6 and the sub-A/D sampling module 7 to communicate with the vector control system 3, transmit voltage information, receive control signals from the vector control system 3, and drive 4 IGBT switches . the

The utility model adopts the vector control technology of the asynchronous motor, decomposes the stator current into the excitation component and the torque component, and controls them respectively, so as to achieve the closed-loop control of the rotating speed. Its specific working principle is as follows: through the three-phase input voltage, the midpoint capacitor is charged to a constant DC voltage to realize the energy transfer of the multi-level matrix inverter 1, and by selecting appropriate switch combinations and control strategies, it can be synthesized on both sides of the converter. Controllable input/output voltage with less low-order harmonic content and approximately sinusoidal, different switch states can synthesize different levels of voltage levels. The multi-level matrix inverter 1 is connected with the three-phase stator of the asynchronous motor 5. The system adopts the traditional vector control method of the asynchronous motor, and its directional flux linkage is the rotor flux linkage. the

Please refer to FIG. 3 again, which is a schematic diagram of the main circuit of the multi-level matrix frequency conversion speed regulation system of the embodiment of the present invention. The main circuit of the multi-level matrix variable frequency speed control system includes 6kV power grid, three-phase high-voltage circuit breakers K1, K2 and K3, charging resistor R, contactor JC1, multi-level matrix inverter 1, voltage sensor CYH, current sensors HCT1 and HCT2 , a wound asynchronous motor with a power of 800kW. When the multi-level matrix variable frequency speed regulation system is in normal operation, the circuit breaker K3 is opened, and the circuit breakers K1 and K2 are closed. When the system is just started, the contactor JC1 is disconnected, and the charging resistor R is connected to the system to prevent inrush current; after the system starts, the contactor JC1 is closed, the charging resistor R exits the system, and the speed control system starts to operate normally. the

Compared with the prior art, the beneficial effect of the utility model is: adopting the modular design, it is convenient to expand according to different system capacities, and at the same time, the redundant design makes maintenance more convenient; compared with the traditional two-level and three-point Flat output, the harmonic content of multi-level output is greatly reduced, the harmonic of the speed control system is reduced, and the power factor of the input side is improved, and the output current is continuous, which improves the lifting efficiency of the mine hoist and reduces the traditional Energy consumption of winding motor rotor series resistance speed regulation mode. the

The above is only a preferred implementation example of the utility model, and does not limit the utility model in any form. Any content that does not deviate from the technical solution of the utility model is based on the technical essence of the utility model to the above implementation examples. Any simple modifications, equivalent changes and modifications all belong to the scope of the technical solution of the present utility model. the

Claims (3)

1. the mine hoist speed-adjusting and control system based on the multi-level matrix frequency converter is connected with wire-wound asynchronous motor with electrical network respectively, it is characterized in that, comprising: multi-level matrix frequency converter, A/D sampling module and vector control system, wherein,

Described multi-level matrix frequency converter one side links to each other with electrical network, opposite side directly links to each other with the asynchronous machine threephase stator, hand over the control of Direct Conversion and rotating speed, realize high performance mine hoist adjusting speed control system, it further comprises 9 * n cascade unit module matrix;

Described A/D sampling module is connected with described multi-level matrix frequency converter, in order to rotating speed, electric current and the voltage parameter that gathers motor;

Described vector control system is connected with the A/D sampling module with described multi-level matrix frequency converter respectively, in order to rotating speed, electric current and the voltage parameter that gathers according to described A/D sampling module, provides the required stator voltage vector signal of asynchronous motor drive.

2. the mine hoist speed-adjusting and control system based on the multi-level matrix frequency converter as claimed in claim 1, it is characterized in that, described 9 * n cascade unit module matrix comprises 9 brachium pontis, each described brachium pontis is formed by the cascade of N low pressure H bridging frequency module, and described cascade brachium pontis is 3 * 3 matrix array, the three-phase input end of one side of described array links to each other with electrical network, and the three-phase output end of opposite side directly links to each other with the threephase stator of asynchronous machine.

3. the mine hoist speed-adjusting and control system based on the multi-level matrix frequency converter as claimed in claim 2, it is characterized in that, described low pressure H bridging frequency module further comprises low pressure H bridging frequently unit, sub-A/D sampling module and trigger impulse control module, wherein

Described low pressure H bridging frequently unit is the bridge-type single-phase inverter that four IGBT switches and electrochemical capacitor form;

Described sub-A/D sampling module is connected the unit frequently with described low pressure H bridging, in order to gather capacitance voltage;

Described trigger impulse control module respectively with described low pressure H bridging frequently the unit be connected the A/D sampling module and be connected, in order to carrying out communication with described vector control system, transmission voltage information, the control signal of reception vector control system drives 4 IGBT switches.

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