Active-reactive decoupling control-based parallel method of H-bridge cascaded shore power supply

A technology of decoupling control and shore power supply, which is applied in the direction of output power conversion device, AC power input conversion to AC power output, AC power input conversion to DC power output, etc., which can solve DC voltage overvoltage and output instability etc. to reduce the impact of impact loads, improve efficiency, and achieve power sharing

Active Publication Date: 2018-07-27
澄瑞电力科技(上海)有限公司
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  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the parallel connection of high-high shore power supply has become a new technical difficulty. Since the high-high shore power supply adopts the H-bridge cascaded topology, in order to reduce equipment costs, the rectifier side adopts diode rectification, and the outgoing line circulation in parallel connection is very difficult. The problem of DC voltage overvoltage is prone to occur, resulting in unstable output after high-high shore power supplies are connected in parallel, which has a great impact on both the load and the grid

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  • Active-reactive decoupling control-based parallel method of H-bridge cascaded shore power supply
  • Active-reactive decoupling control-based parallel method of H-bridge cascaded shore power supply
  • Active-reactive decoupling control-based parallel method of H-bridge cascaded shore power supply

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Embodiment Construction

[0024] Below in conjunction with embodiment the present invention is further described in detail.

[0025] A method for parallel connection of H-bridge cascaded shore power supplies based on active and reactive power decoupling control of the present invention, the main circuit of which is a high-high shore power variable frequency power supply based on H-bridge cascades, including grid-connected switch G1, pre-charging Module M1, a rectification link, a DC voltage link, an AC inverter link, an output filter link, and a voltage and current detection and control link. The rectification link includes phase-shifting transformer T1, uncontrolled rectification unit 1-18; the DC voltage link includes DC voltage unit 1-18, chopping unit 1-18, and the AC inverter link includes H-bridge cascaded inverter unit 1-18 ; The output filter link includes an isolation transformer T2, filter capacitors C1-C3, filter reactance L1-L3, and an output switch G2.

[0026] The voltage and current det...

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Abstract

The invention discloses an active-reactive decoupling control-based parallel method of an H-bridge cascaded shore power supply. By the parallel method, parallel connection of a plurality of high-highshore power supplies can be achieved, so that the capacity of the shore power supply is expanded; and moreover, during the whole process, rapid current tracking and effective power sharing can be achieved, a circulation phenomenon is prevented, the voltage of a DC bus is effectively stabilized, and the running reliability of the system is improved.

Description

technical field [0001] The invention relates to a parallel connection method of an H-bridge cascaded shore power supply based on active and reactive power decoupling control, and belongs to the technical field of parallel control of high-voltage shore power supplies. Background technique [0002] The shore power system is mainly divided into a low-voltage shore power system and a high-voltage shore power system, and the high-voltage shore power system is the most widely used. The high-voltage shore power system usually adopts two power supply methods. One is the high-low-high power supply scheme. This scheme has low construction cost, but low efficiency, serious harmonic pollution, and relatively high cost. It is an early high-voltage shore power system. The solution that is often adopted when immature. The other is a high-to-high shore power solution directly using H-bridge cascading. With the demand for shore power utilization in ports, the demand for shore power capacit...

Claims

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Application Information

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IPC IPC(8): H02J3/42H02M5/458H02M7/493H02M7/5387H02M1/12
CPCH02J3/42H02M1/12H02M5/458H02M7/493H02M7/5387H02M1/007
Inventor 胡金杭苗亚金泽
Owner 澄瑞电力科技(上海)有限公司
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