Current amplitude limiting control method applied to voltage ramp control mode of solid-state soft starter

A technology of ramp control and current limiting, which is used in motor generator control, motor control, starter of a single-phase induction motor, etc. It can solve the problem that the output voltage cannot be boosted and climbed, and improve safety and reliability. Effect

Inactive Publication Date: 2017-08-18
MCQUAY AIR CONDITIONING & REFRIGERATION WUHAN
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Problems solved by technology

[0004] In the traditional current limiting working mode, due to the current-oriented control, the voltage is not a controlled object, and its output voltage cannot be stepped up and down according to the artificially set time requirements.

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  • Current amplitude limiting control method applied to voltage ramp control mode of solid-state soft starter
  • Current amplitude limiting control method applied to voltage ramp control mode of solid-state soft starter
  • Current amplitude limiting control method applied to voltage ramp control mode of solid-state soft starter

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Embodiment Construction

[0034] 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. The specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not constitute a conflict with each other.

[0035] The invention is applied in a digitally controlled thyristor type three-phase soft starter. This soft starter consists of figure 2 The main power circuit and control circuit shown in the figure are realized. The main principle is to carry out software programming control through the digital signal processor DSP (Digital Signal Processing), and to adjust the voltage output by implementing phase trigger control on th...

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Abstract

The present invention discloses a current amplitude limiting control method applied to the voltage ramp control mode of a solid-state soft starter. The method is characterized in that current limiting control is adopted under a voltage ramp control mode in the start control of a thyristor control-based solid-state soft starter. According to the method, under the voltage ramp control mode, when a current effective value is smaller than a current amplitude limiting set value, voltage boost control is carried out according to the voltage ramp control mode; when the current effective value is larger than the current amplitude limiting set value, the control method shifts to a current amplitude limiting work mode so as to limit the boost action of voltage; and the switching of the current amplitude limiting work mode is performed according to a method in which hysteresis comparison is set according to the effective value of present instantaneous operating current. With the method of the invention adopted, current amplitude limiting control is implemented when current exceeds a dangerous threshold value under a condition that voltage control can be substantially completed according set voltage boost time and voltage drop time. With the control method adopted, the safety and reliability of a thyristor control-based motor soft starter can be greatly improved.

Description

technical field [0001] The invention relates to a control method of a solid-state soft starter, in particular to a method capable of simultaneously performing current limiting control in a voltage control mode. Background technique [0002] There are two control modes commonly used in the control of solid-state soft starters. One is the voltage-targeted control method, which is called the voltage ramp control mode, such as figure 1 As shown, U 0 is the initial operating voltage percentage of the soft starter, t u is the rise time of the effective value of the output voltage of the soft starter during the soft start process, the abscissa is the control time axis, and the ordinate is the percentage of the output voltage of the soft starter. This method is a voltage open-loop control method. In this voltage open-loop control method, the current It changes as the load changes, and the current is completely out of control. The second is the current-targeted control method, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P29/032H02P1/42
CPCH02P1/423H02P29/032
Inventor 蔡畅张江涛喻杰徐峰
Owner MCQUAY AIR CONDITIONING & REFRIGERATION WUHAN
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