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Reactive current control method to reduce fault ride-through impact of AC-DC hybrid distribution network

A distribution network fault, AC and DC hybrid technology, applied in AC network circuits, reactive power compensation, reactive power adjustment/elimination/compensation, etc., can solve the problems of fault current control and low-voltage ride-through control strategies, etc. To achieve the effect of reducing the impact

Active Publication Date: 2021-11-02
NANJING INST OF TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the research on PET mainly focuses on circuit topology, control strategy, application of new power devices, etc., but there are not many researches on its fault current control and low voltage ride-through control strategy.

Method used

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  • Reactive current control method to reduce fault ride-through impact of AC-DC hybrid distribution network
  • Reactive current control method to reduce fault ride-through impact of AC-DC hybrid distribution network
  • Reactive current control method to reduce fault ride-through impact of AC-DC hybrid distribution network

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Embodiment Construction

[0030] The present invention will be further described below in conjunction with the accompanying drawings.

[0031] Such as figure 1 A schematic diagram of a PET-based AC / DC hybrid distribution network is shown, wherein the PET is mainly composed of a front-stage AC / DC power conversion module and a rear-stage DC / DC power conversion module. The pre-stage AC / DC power conversion module is the core link of PET. This link can be H-bridge cascaded multi-level structure converter, modular multi-level converter MMC or a hybrid module combination of cascaded H-bridge + MMC structure. level shifter. The post-stage DC / DC power conversion module adopts a bidirectional isolated DC / DC converter (DAB). Through the interconnection and coordination of the two power conversion modules, functions such as interconnection of AC and DC distribution networks, access to distributed new energy, and conversion of different voltage levels are realized.

[0032] Such as figure 2 The working control...

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Abstract

The invention discloses a reactive current control method for reducing the fault ride-through impact of the AC-DC hybrid distribution network. According to the voltage drop factor and the grid-connected point current, a reactive power control current adopting different function characteristics in the PET fault ride-through process is proposed. The optimal given method replaces the reactive current given by the traditional low-voltage ride-through strategy with the optimized reactive current given value, which is more in line with the actual situation required by low-voltage ride-through and reduces the state switching in the traditional low-voltage ride-through strategy The shock caused by it improves the safety and reliability of the system.

Description

technical field [0001] The invention relates to the technical field of power electronic transformers (PET), in particular to a reactive current control method for reducing fault ride-through impacts of an AC / DC hybrid distribution network. Background technique [0002] Power electronic transformer (Power Electronic Transformers, PET) is a new type of power conversion device based on modern power electronics technology, which is widely used in AC and DC hybrid distribution networks to realize the interconnection of multiple types of distributed power sources. In the context of the future energy Internet and the diversification of load types, the promotion and application of power electronic transformers can simplify the network structure and improve the efficiency of power supply and distribution. [0003] At present, the research on PET mainly focuses on circuit topology, control strategy, application of new power devices, etc., but there are not many researches on its fault...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/18
CPCH02J3/1857Y02E40/30
Inventor 张亮李丹栋周永荣袁宇波孙军水恒华孔祥平葛雪峰陆永灿王晨清
Owner NANJING INST OF TECH