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A three-phase converter and its control method

A three-phase converter, three-phase current technology, applied in AC motor control, control system, AC power input conversion to DC power output and other directions, can solve the common mode current oscillation, affecting system stability and other problems

Active Publication Date: 2021-12-03
HUAWEI TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is a series connection of inductance and capacitance in the withdrawal circuit, and there is a natural series resonance frequency. If this frequency overlaps with the frequency range of the common-mode voltage source generated by DPWM modulation, series resonance will occur, causing a large oscillation of the common-mode current , thus affecting the system stability

Method used

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  • A three-phase converter and its control method
  • A three-phase converter and its control method
  • A three-phase converter and its control method

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Embodiment Construction

[0059] The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0060] A three-phase converter in an embodiment of the present invention is used to convert direct current into alternating current or convert alternating current into direct current. For example, in a photovoltaic power supply system, the direct current generated by photovoltaic solar panels is converted into alternating current with the same frequency as the grid through a converter, and the alternating current is transmitted to the grid to realize the grid connection of the photovoltaic power supply system and the grid. In an electric vehicle, the three-phase converter can realize two-way operation. For example, the DC output of the battery of the electric vehicle passes through the three-phase converter and then becomes an AC output motor. When the electric vehicle decelerates, the reverse current generated by the m...

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Abstract

A three-phase converter, which is used to connect between a DC system and an AC system for mutual conversion of DC and AC. The three-phase converter includes a switch network, a three-phase filter connected to the switch network, and a three-phase filter connected to the switch network. The sampling unit, the control unit connected to the sampling unit, the active damping unit connected to the control unit and the sampling unit, and the modulation unit connected between the active damping unit and the switch network. The sampling unit is used to obtain the three-phase current in the three-phase filter, and send the three-phase current to the active damping unit. The active damping unit is used to obtain a new three-phase modulation wave according to the three-phase current, and transmit the new three-phase modulation wave to the modulation unit. The modulation unit is used for modulating the new three-phase modulation wave as a driving signal of the switch network to drive the switch network to work.

Description

technical field [0001] The invention relates to the field of energy power supply, in particular to a three-phase converter and a control method thereof. Background technique [0002] With the development of economy and society, the energy crisis has gradually become prominent and the global environment has gradually deteriorated. The development and use of clean alternative energy has become an important goal of the energy industry. With the continuous development of new energy power generation, energy storage and new energy automobile industry, the converter as the core energy control device has become one of the key factors in the application of clean energy. An essential unit of delivery. [0003] Among many types of converters, three-phase converters are one of the most widely used converters, which are used to connect three-phase AC power systems and DC power systems and realize energy transfer between the two systems. According to the different direction of energy fl...

Claims

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Application Information

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IPC IPC(8): H02M7/487
CPCH02M7/487H02M7/53873H02M7/5395Y02E10/56H02M1/0012H02M1/123Y02E60/60H02M7/53871H02S40/32H02P27/08H02M1/126H03H7/0115H02J3/38H02M1/0009
Inventor 刘方诚辛凯郭海滨
Owner HUAWEI TECH CO LTD
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