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A Cascaded Power Electronic Transformer and Its Unbalance Compensation Control Method

A technology of power electronics and control methods, applied in electrical components, circuit devices, AC network circuits, etc., to achieve the effect of suppressing negative sequence current and improving the ability to cope with unbalanced conditions

Active Publication Date: 2020-03-13
南京雁展科技有限公司
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Problems solved by technology

[0005] In order to overcome the defects of the prior art, the present invention provides a cascaded power electronic transformer unbalance compensation control system and method, which can simultaneously solve the problem of PET negative sequence current compensation when the grid side voltage and three-phase load are unbalanced, So as to promote the application of power electronic transformers in engineering practice

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  • A Cascaded Power Electronic Transformer and Its Unbalance Compensation Control Method
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  • A Cascaded Power Electronic Transformer and Its Unbalance Compensation Control Method

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Embodiment Construction

[0047] Exemplary embodiments, features, and aspects of the present invention will be described in detail below with reference to the accompanying drawings. The same reference numbers in the figures indicate functionally identical or similar elements. While various aspects of the embodiments are shown in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

[0048] The invention discloses a cascaded PET unbalance compensation strategy based on the auxiliary control of the reduced-order generalized integrator. By embedding a ROGI regulator in the decoupling control link of the positive dq axis system, the positive and negative sequence currents are unified Control, because there is no need for command current calculation and positive and negative sequence separation links, the control of the input stage has been significantly simplified.

[0049] A typical PET topology such as figure 1 As shown, it includes three parts: rectification, isolat...

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Abstract

The invention provides an unbalance compensation control method of a cascaded power electronic transformer, comprising a control component and a transformer, wherein the transformer is composed of aninput rectifier stage, an isolation stage and an output inverter stage. The input stage is a three-phase star-connected cascaded H-bridge rectifier, the isolation stage is a plurality of independent dual-active-bridge converters, and the output stage is a single-phase PWM inverter. The control method of the present invention includes an input rectifier stage stratification control unit, a voltageclosed loop control unit of an isolation stage and a constant voltage and current sharing control unit of an output inverter stage. The input rectifier stage stratification control unit, is further divided into an upper control unit and a lower control unit, wherein the upper control unit is composed of a coordinate transformation, a positive sequence decoupling control and a negative sequence current suppression, and the lower control unit is an in-phase voltage sharing control. The control method provided by the invention can simultaneously solve the negative sequence current compensation problem of the PET when the voltage at the network side and the three-phase load are unbalanced, thereby promoting the application of the power electronic transformer in the engineering practice.

Description

technical field [0001] The invention belongs to the technical field of power electronic transformers, and in particular relates to an unbalance compensation control method of cascaded power electronic transformers. Background technique [0002] Power Electronic Transformer (PET), also known as Solid State Transformer (SST), is a power transformation device that replaces traditional power frequency transformers in power electronic power systems. In addition to isolation and isolation, it also has the functions of reactive power compensation, harmonic suppression, bidirectional power transmission and multi-output power supply. [0003] In recent years, with the continuous development of PET technology, its application in medium and high voltage distribution networks has attracted more and more attention. In high-voltage applications, due to the limited withstand voltage level of power switching devices, modular or cascaded structures are often used to increase the input volta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M5/458H02J3/26
CPCH02J3/26H02J2203/20H02M5/4585Y02E40/50
Inventor 曲正伟姚云枭王云静郭蕊孟令楠
Owner 南京雁展科技有限公司
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