Application of high-voltage variable-frequency and variable-speed system in shaft hoist

A technology of mine hoist and speed regulation system, which is applied in the control system, motor/generator/inverter limiter, motor generator control, etc. problems such as poor speed quality, to achieve the effect of improving power factor, improving efficiency, and improving speed regulation quality

Inactive Publication Date: 2006-07-12
RONGXIN POWER ELECTRONICS
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Problems solved by technology

[0002] The mine hoist in the prior art is the speed regulation mode of the rotor series resistance of the wound rotor motor, and its disadvantages are poor quality of speed regulation; high energy consumption; low power factor; high failure rate and large amount of maintenance
The traditional rectifier of high-voltage variable frequency speed regulator is a diode uncontrollable rectification scheme, which does not use resistance braking or braking function with controllable rectification circuit, and cannot realize electric motor braking
The AC / AC frequency converter can realize four-quadrant operation, but the harmonics are large and cause serious pollution to the power grid; the defect of the AC-DC three-level or two-level frequency converter is also that the harmonics are relatively large, and the du / dt is very high. Motors have special requirements

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  • Application of high-voltage variable-frequency and variable-speed system in shaft hoist
  • Application of high-voltage variable-frequency and variable-speed system in shaft hoist
  • Application of high-voltage variable-frequency and variable-speed system in shaft hoist

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Embodiment Construction

[0020] See figure 1 , the application of high-voltage frequency conversion speed regulation system in mine hoist, its control strategy adopts asynchronous motor flexible traction closed-loop, the controller sends out appropriate frequency amplitude and three-phase sinusoidal signal command according to the error between speed given and speed feedback , the command is sent to the high-voltage inverter, which outputs AC power meeting the above requirements through the high-voltage inverter to drive the motor to run, so that the running performance strictly meets the requirements of the given speed.

[0021] The high-voltage frequency conversion speed regulation system adopts the high-performance, mature technology, safe and reliable input isolation transformer-H bridge unit series multi-level technical scheme and the flexible traction closed-loop method of asynchronous motor, which can realize the forward and reverse traction braking of the motor.

[0022] See figure 2 , the h...

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Abstract

The invention relates to application of high-voltage variable-frequency control system in mine winder. Wherein, with asynchronous motor flexible draught closed loop as control strategy, generating proper frequency and amplitude and three-phase sine signal command by the controller according to error between given and feedback rotation speeds to send to high-voltage frequency converter to output ac power accorded with said request to drive motor with running performance rigorous coincidence with request; using IGBT chopping-wave resistance braking mode or of regenerative braking controlled rectifier for motor electric brake. This invention improves speed regulation quality of winder obviously, saves 30-40% energy, increases power factor more than 0.96, and solves difficulty of high-voltage heavy-power motor in four operating conditions.

Description

technical field [0001] The invention relates to the application field of speed-regulating equipment in mine hoists, and relates to the application of a high-voltage frequency conversion speed-regulating system in mine hoists. Background technique [0002] The mine hoist in the prior art is a speed regulation method of a wound rotor motor rotor series resistance, and its disadvantages are poor speed regulation quality, high energy consumption, low power factor, high failure rate, and large maintenance volume. The traditional rectifier of high-voltage variable frequency speed regulator is a diode uncontrollable rectification scheme, which does not use resistance braking or braking function with controllable rectification circuit, and cannot realize electric motor braking. The AC / AC frequency converter can realize four-quadrant operation, but the harmonics are large and cause serious pollution to the power grid; the defect of the AC-DC three-level or two-level frequency convert...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P27/04H02P3/18H02P3/22
Inventor 李兴左强徐颖孙蕾陈昭韩国君钱宝利丁迎春
Owner RONGXIN POWER ELECTRONICS
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