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Control method and system for voltage support of three active bridge power electronic transformers

A technology of transformer voltage and power electronics, which is applied in the direction of control/regulation system, regulation of electric variables, instruments, etc. It can solve the problems that the control objectives of multi-voltage levels can not be supported by each other, so as to improve the dynamic response performance, good support effect, The Effect of Simplifying Complexity

Active Publication Date: 2021-12-03
UNIV OF SCI & TECH BEIJING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention provides a control method and system for voltage support of three active bridge power electronic transformers to solve the technical problem that the prior art cannot realize the control target of mutual support of multiple voltage levels

Method used

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  • Control method and system for voltage support of three active bridge power electronic transformers
  • Control method and system for voltage support of three active bridge power electronic transformers
  • Control method and system for voltage support of three active bridge power electronic transformers

Examples

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no. 1 example

[0062] This embodiment provides a control method for the voltage support of three active bridge power electronic transformers. On the basis of maintaining a constant ratio of the voltage at the low-voltage side port, it can directly or indirectly maintain the voltage stability of the low-voltage port through the phase shift angle to achieve different In the case of decoupling, the control target that the voltages of each port support each other.

[0063] Among them, the main structure of the three active bridge power electronic transformer is as follows: figure 1 As shown, it includes: the primary and secondary turns ratio is 1:n 12 :n 13 The three-winding isolation transformer T, the three groups are composed of switching tubes S 1 , S 2 , S 3 , S 4 , S 5 , S 6 , S 7 , S 8 , S 9 , S 10 , S 11 , S 12 constituted by the H-bridge and the auxiliary inductor L 1 , L 2 , L 3 , and the input and output DC bus capacitance C 1 、C 2 、C 3 . The three ports of the tra...

no. 2 example

[0096] This embodiment provides a control system for voltage support of three active bridge power electronic transformers, the control system for voltage support of three active bridge power electronic transformers includes:

[0097] The input and output electrical signal acquisition module is used to acquire the input electrical signal of port #1 and the output electrical signal of port #2 and port #3;

[0098] The first control module is used to obtain the phase shift angle between the bridges between port #2 and port #3 based on the output electrical signals of port #2 and port #3 obtained by the input and output electrical signal acquisition module, and use port # The phase shift angle between the bridges between 2 and port #3 is used as the first control degree of freedom to keep the output voltage ratio of port #2 and port #3 constant so that the low-voltage subnetwork on either side can support the other side The voltage of the low-voltage sub-network realizes mutual vo...

no. 3 example

[0102] This embodiment provides an electronic device, which includes a processor and a memory; at least one instruction is stored in the memory, and the instruction is loaded and executed by the processor, so as to implement the method of the first embodiment.

[0103] The electronic device may have relatively large differences due to different configurations or performances, and may include one or more processors (central processing units, CPU) and one or more memories, wherein at least one instruction is stored in the memory, so The above instruction is loaded by the processor and executes the above method.

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Abstract

The invention discloses a control method and system for voltage support of three active bridge power electronic transformers. The method includes: taking the phase shift angle between bridges between low-voltage ports as the first control degree of freedom to maintain the output of the low-voltage ports The voltage ratio is constant, so that the low-voltage subnetwork on either side can support the voltage of the other side low-voltage subnetwork, and realize the mutual voltage support between the low-voltage subnetworks; the phase shift angle between the bridge between the high-voltage port and the port on the low-voltage side is taken as the first The second control degree of freedom is to control the transmission power from the high-voltage side to the low-voltage side, so as to achieve the control goal that the high-voltage side directly or indirectly supports the voltage stability of the low-voltage side. By introducing feed-forward compensation, the dynamic response performance of the system is improved. The solution of the present invention does not require decoupling, which simplifies the complexity of control. In addition, when a voltage drop occurs on the low-voltage side, the high-voltage DC bus and the low-voltage sub-network on the other side can provide voltage support for it at the same time.

Description

technical field [0001] The invention relates to the technical field of direct current distribution and utilization, in particular to a control method and system for voltage support of three active bridge power electronic transformers. Background technique [0002] DC distribution network has attracted extensive attention due to its advantages of high efficiency and easy control. Among them, DC-DC power electronic converter, as the key equipment of DC power distribution, plays an important role in promoting the development of DC distribution network. Three active bridge power electronic transformers have the advantages of electrical isolation, bidirectional flow of power, and easy realization of soft switching, so they can play an important role in realizing electrical isolation and voltage conversion between high and low voltages in DC distribution networks. Compared with the dual-port converter, the three-active-bridge power electronic transformer interconnects multiple sub...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335
CPCH02M3/33576
Inventor 王翔翁楚迪彭勇刚
Owner UNIV OF SCI & TECH BEIJING
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