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Three-phase pulse width modulation (PWM) rectifier soft starting system

A rectifier and soft-start technology, applied in the field of soft-start systems, can solve problems such as power grid impact and loss of power devices

Inactive Publication Date: 2011-11-23
大连大工安道船舶技术股份有限公司
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Problems solved by technology

[0005] In view of the defects existing in the prior art, the object of the present invention is to provide a soft start system for a three-phase PWM rectifier, which solves the problem of the impact on the power grid due to the rapid rise of the DC bus voltage when the three-phase high-power PWM rectifier is started. Possible Loss of Power Device Issues

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Embodiment Construction

[0011] A soft start system for a three-phase PWM rectifier. Three bidirectional thyristors 2 are connected between the three-phase power grid 1 and the rectifier 4. At the moment of starting, the bidirectional thyristor 2 is turned on through the control of the controller 3 The angle gradually increases within the specified time until it is fully turned on; during this process, the IGBT is in the off state, and due to the existence of the freewheeling diode, the rectifier is in the diode-controlled rectification state, and the DC bus voltage rises steadily. When the DC After the bus voltage is stable, start the PWM control, and the three-phase PWM rectifier will enter the normal working state smoothly.

[0012] The bidirectional thyristor 2 selects a bidirectional anti-parallel thyristor, and selects specifications according to the input voltage and current. After the three-phase PWM rectification enters the normal working state, the thyristor device will always work in the ful...

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Abstract

The invention discloses a three-phase pulse width modulation (PWM) rectifier soft starting system, which belongs to the technical fields of power electronics and current transformation. A two-way silicon controlled rectifier is connected between a three-phase power grid and a rectifier; at the moment of starting, a conduction angle of the two-way silicon controlled rectifier is gradually increased within a stipulated time until a full-conduction state is realized under the control of a controller; and in the process, an insulated gate bipolar transistor (IGBT) is in an off state, the rectifier is in a diode controlled rectification state due to the existence of fly-wheel diodes, the voltage of a DC bus is stably increased, PWM control is started after the voltage of the DC bus is stabilized, and the three-phase PWM rectifier may stably enter a normal working state. The system can start the rectifier on the basis of increasing the voltage of the bus to a certain value before the PWM rectifier works normally, and gently increase the voltage of the DC bus without relatively higher impact to effectively protect a power device.

Description

technical field [0001] The invention relates to a soft start system of a three-phase PWM rectifier, which belongs to the technical fields of power electronics and inverter. Background technique [0002] As a power supply device that converts electrical energy from AC to DC, rectifiers are essential in applications in various industries. The traditional rectifier is composed of an uncontrollable rectifier circuit composed of diodes or a phase-controlled rectifier circuit composed of thyristors. Because of its simple control and reliable operation, it has been widely used in the field of power conversion of power electronic equipment. However, this type of rectifier has the disadvantages of high harmonic content of grid-side current, absorbing reactive power from the grid, low power factor of the grid, and energy can only be transmitted in one direction, which makes its application less and less suitable for the development of modern power electronics. Require. [0003] In t...

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Application Information

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IPC IPC(8): H02M1/36
Inventor 滕传庚韩国勇李海泉
Owner 大连大工安道船舶技术股份有限公司
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