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Control method of hybrid direct-current power electronic transformer

A control method and technology of power electronics, which can be used in high-efficiency power electronic conversion, DC network circuit devices, DC power input conversion to DC power output, etc., and can solve problems such as excessive input voltage deviation.

Pending Publication Date: 2021-02-02
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The problem to be solved by the present invention is how to propose a control strategy that can solve the problem of excessive input voltage deviation between modules while ensuring that the output voltage and power can be actively adjusted and has a certain operating efficiency

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  • Control method of hybrid direct-current power electronic transformer
  • Control method of hybrid direct-current power electronic transformer

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Embodiment Construction

[0024] now attached figure 1 -7, a detailed description of the control method of a hybrid DC power electronic transformer proposed by the present invention.

[0025] figure 1 is a block diagram of the control method in the embodiment of the present invention, in the figure, V o is the output side voltage; V in is the input side voltage; I o is the output side voltage, V in(i) (i=1, 2, . . . , n) is the input voltage of the i-th sub-module.

[0026] figure 2 It is a hybrid DC power electronic transformer topology targeted by the present invention, its input and output sides are respectively connected to high and low levels of DC buses, and the basic DC / DC converter unit is a dual active full bridge DC converter and resonant DC converters, C in 、C o They are filter capacitors on the series (high voltage) side and parallel (low voltage) side respectively.

[0027] Figure 3(a) is a schematic diagram of the constant voltage control of the hybrid DC power electronic transf...

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Abstract

The invention discloses a control method of a hybrid direct-current power electronic transformer. The hybrid direct-current power electronic transformer is composed of a dual-active full-bridge direct-current converter and a resonant direct-current converter, and the control method comprises voltage normal state control and abnormal state control. When the system voltage is normal, the dual-activefull-bridge direct-current converter adopts phase shift control and is used for realizing active adjustment of output power and voltage; the resonant direct-current converter adopts open-loop controland directly works in a resonant state; when the system voltage rises or falls, the resonant direct-current converter adopts active frequency modulation control, and the input voltage of the resonantconverter is changed by adjusting the switching frequency of the resonant converter, so that the purpose of balancing the input voltage of each direct-current converter is achieved. According to thecontrol method provided by the invention, the problem operation of a system is not influenced, the input voltage balance of each converter is realized when the input voltage fluctuates, and the stability of the system is ensured.

Description

technical field [0001] The invention relates to a control method of a hybrid DC power electronic transformer, which can solve the problem of unbalanced input voltage of each sub-module generated when the hybrid DC power electronic transformer fluctuates in the system input side voltage. Background technique [0002] In recent years, flexible DC transmission technology and its application in DC grids have gradually become a research hotspot and have received extensive attention. Power Electronic Transformer (Power Electronic Transformer, PET) or also known as Solid State Transformer (Solid State Transformer, SST), as a key link in the flexible DC distribution network, can realize the voltage and voltage between the high and low voltage DC distribution network or microgrid. The flexible control and rapid management of power has important theoretical value and engineering significance. [0003] A hybrid DC power electronic transformer composed of two sub-modules of a dual acti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J1/00H02M3/28H02M3/335
CPCH02J1/00H02M3/28H02M3/33569Y02B70/10
Inventor 付超武承杰
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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