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Motor starting device

A technology of starting device and reactor, applied in the direction of motor generator/starter, starter of motor, reactive power compensation, etc. The effect of reducing start-up time, improving power factor and improving grid quality

Inactive Publication Date: 2011-08-31
MAANSHAN RUIHUA ELECTRIC TECH
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

However, this device has the following disadvantages: Although the soft starter starts smoothly and has an obvious effect on reducing the motor starting inrush current, the thyristor Voltage regulation will generate large harmonic currents, causing "pollution" to the grid, and causing damage to motors such as fans and pumps that need to be started frequently; If the grid capacity connected to the motor is weak, the soft starter cannot effectively reduce the voltage drop, and the motor still cannot start successfully; Each motor needs a special soft starter; prolongs the motor starting time

Method used

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Embodiment Construction

[0027] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0028] like figure 1 As shown, the online digital detection method is adopted, and the online digital detection system collects variables such as active power, reactive power, and power angle on the motor receiving bus in real time, and uses DSP (injection operation processing model) and inverter controller to form a closed-loop system.

[0029] DSP operation and closed-loop control model: After the compensation given value is compared with the compensation feedback value, the PID adjustment operation is performed, and then the drive circuit controls the inverter controller to output reactive current to form a minimum amount of compensation reactive current closed-loop adjustment control. The DSP operation control model mainly completes the voltage value, current value, power factor, given value of reactive power compensation amount, feedback ...

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Abstract

The invention discloses a motor starting device and belongs to the technical field of motor starting equipment. The device provided by the invention comprises an inverter controller, an on-line digital detection system and a DSP (digital signal processor), wherein the inverter controller comprises a three-phase inverter bridge, compensation capacitor, reactors and the like; the three-phase inverter bridge is connected with a power receiving busbar of a motor through the three reactors (or transformers); the compensation capacitor is connected with the DC-side of the three-phase inverter bridge; and the on-line digital detection system, the DSP and the inverter controller form a closed-loop system. According to the invention, the starting device can rapidly track and compensate reactive current needed in the starting process of the motor in real time without producing harmonic current, can reduce voltage dip in the starting process of the motor and can shorten the start-up time of the motor.

Description

technical field [0001] The invention relates to a motor starting device and belongs to the technical field of motor starting equipment. Background technique [0002] Most of the current motor starting devices simply connect all or groups of compensation capacitors to the motor circuit breaker, resulting in over-compensation or under-compensation. The parameters are not ideal; and the device exits after the motor is started, and one motor needs a set, so that the utilization rate of the device is not high. [0003] There are mainly the following methods for starting a large motor: [0004] (1) Y / △ conversion start [0005] This method is applicable to the delta connection of the stator winding of the motor. The advantage is that the device is simple; the disadvantage is that there is a secondary impact current during the conversion process, and the failure rate is high. The starting torque is only 1 / 3 of the rated torque, which is only suitable for light-load or no-load s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P1/58H02J3/18
CPCY02E40/30
Inventor 王正斌
Owner MAANSHAN RUIHUA ELECTRIC TECH
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