High-voltage frequency converter braking deceleration protection system and method

A high-voltage frequency converter and protection system technology, applied in the control system, motor/generator/inverter limiter, motor generator control, etc., can solve the problems of power unit braking overvoltage, etc., to avoid overvoltage, cost reduction effect

Active Publication Date: 2014-01-08
SUZHOU INOVANCE CONTROL TECH CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0008] The technical problem to be solved by the present invention is to provide a high-voltage inverter braking deceleration protection system and method for the above-mentioned series-type high-voltage inverter power unit braking overvoltage problem

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  • High-voltage frequency converter braking deceleration protection system and method
  • High-voltage frequency converter braking deceleration protection system and method
  • High-voltage frequency converter braking deceleration protection system and method

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Embodiment Construction

[0032] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0033] Due to the large inertia during operation, the high-voltage motor is in the power generation state when it decelerates and brakes. If the heating of the stator and rotor of the motor and other losses during the conversion process are ignored, the following energy conversion relationship exists in the entire braking process:

[0034] ∫ 0 t P 1 ( t ) ...

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Abstract

The invention provides a high-voltage frequency converter braking deceleration protection system. A high-voltage frequency converter adopts a power unit serial connection type structure, and comprises a voltage sampling unit, a differential voltage calculation unit and a first self regulating controller, wherein the voltage sampling unit is used for sampling the direct current bus voltage of all power units of the high-voltage frequency converter, the differential voltage calculation unit is used for calculating the variation value of the direct current bus voltage, and the first self regulating controller is used for making the high-voltage frequency converter stop outputting braking voltage to an electric motor when the variation value of the direct current bus voltage exceeds the first threshold. The invention also provides a corresponding method. The deceleration time and/or the output torque upper limit of a speed regulator is automatically regulated according to the variation value of the direct current bus voltage change value of the power unit during the braking operation of the high-voltage frequency converter, the over voltage of the power unit can be avoided without the additional addition of circuits, and the cost of the high-voltage frequency converter is reduced.

Description

technical field [0001] The invention relates to the field of high-voltage frequency converter control, and more specifically relates to a high-voltage frequency converter braking deceleration protection system and method. Background technique [0002] High-voltage frequency converters are widely used in petrochemical, mining, metallurgy and urban construction applications, and play an important role in reducing energy consumption and improving processes. At present, the main circuit of the high-voltage frequency converter mainly adopts the power unit series structure. Power unit series multi-level high-voltage inverter is a widely used high-voltage inverter, such as figure 1 , 2 As shown, the input side is phase-shifted and isolated by a phase-shifting transformer, and the voltage is stepped down to obtain multiple sets of low-voltage three-phase AC power. Each set of three-phase low-voltage AC power is connected to different power units (such as A1 unit-A5 unit, B1 unit-B...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P3/18
Inventor 蔡准
Owner SUZHOU INOVANCE CONTROL TECH CO LTD
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