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
CN1801599AInactive Publication Date: 2006-07-12RONGXIN POWER ELECTRONICS
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
RONGXIN POWER ELECTRONICS
Publication Date
2006-07-12
Estimated Expiration
Not applicable · inactive patent

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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.
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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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