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A method for active voltage regulation control of a voltage equalizing converter

A technology of voltage regulation control and converter, which is applied in the direction of control/regulation system, conversion equipment with intermediate conversion to AC, and conversion equipment without intermediate conversion to AC, etc., which can solve system damage, magnetic component transformer design difficulties, and off Increased breaking loss and other issues

Active Publication Date: 2021-09-10
BEIJING JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, when the DCPET works in the failover mode, the input voltage of the DC / DC sub-module increases due to the reduction of the number of modules
If the voltage equalizing converter is still working in the voltage equalizing mode at this time, the input voltage of the LLC resonant converter will also rise and cause it to work in the buck mode, which will cause the following problems: First, the LLC resonant converter works in the buck mode The interval requires a wider voltage regulation and operating frequency range, which increases the difficulty of parameter design
According to the LLC gain characteristic curve, the switching frequency in the step-down range is higher than the resonant frequency, which brings difficulties to the design of magnetic components such as resonant inductors and transformers
Secondly, the switching frequency of the LLC resonant converter has an upper limit, and the output voltage cannot be effectively adjusted when the input voltage drops too severely.
Furthermore, when the LLC resonant converter works in the step-down mode, the turn-off loss of the primary switching tube increases, and the secondary rectifier diode loses the ZCS turn-off characteristic, resulting in an increase in the reverse recovery loss, and the increase in the switching frequency leads to an increase in the loss of the LLC resonant converter. Large, LLC resonant converters and DCPET efficiency drops severely
On the one hand, under the existing heat dissipation conditions, if the heat cannot be dissipated in time, it will reduce the service life of the switch or even cause system damage due to overheating; on the other hand, in order to ensure the heat dissipation conditions of the power switch, the radiator needs to have a stronger heat dissipation capacity , which means an increase in the size and cost of the radiator, which contradicts the improvement in power density and economy

Method used

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  • A method for active voltage regulation control of a voltage equalizing converter
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Embodiment Construction

[0066] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0067] On the contrary, the invention covers any alternatives, modifications, equivalent methods and schemes within the spirit and scope of the invention as defined by the claims. Further, in order to make the public have a better understanding of the present invention, some specific details are described in detail in the detailed description of the present invention below. The present invention can be fully understood by those skilled in the art without the description of these detailed parts.

[0068] The invention provides an active voltage regulation control method of a voltage equalizing conv...

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Abstract

The invention proposes an active voltage regulation control method for a voltage equalizing converter, which is suitable for flexible direct current transmission and distribution networks, new energy grid connection, energy Internet and other fields where bidirectional isolated DC power electronic transformers with voltage equalizing converters are used . The active voltage regulation control method of the voltage equalizing converter proposed by the present invention endows the voltage equalizing converter with the ability to adjust the voltage and improves the control flexibility; the present invention optimizes the switching frequency of the proposed active voltage regulating control method of the voltage equalizing converter Select, further improve the transformation efficiency under the dc power electronic transformer fault redundancy working condition; the active voltage regulation control method of the voltage equalizing converter proposed by the present invention can maintain the LLC input voltage constant when the dc power electronic transformer fault redundancy, thereby improving The output voltage adjustment capability of the DC power electronic transformer under the fault redundancy working condition can reduce the parameter design difficulty of the LLC resonant converter at the same time.

Description

technical field [0001] The invention relates to an active voltage regulation control method of a voltage equalizing converter, which is suitable for flexible direct current transmission and distribution networks, new energy grid connection, energy Internet and other fields where medium and high voltage bidirectional isolated direct current power electronic transformers may be used. Background technique [0002] Power Electronic Transformer (PET), also known as Solid State Transformer (SST), is an electronic power device that replaces traditional transformers through high-frequency energy conversion technology. The power electronic transformer used for energy transmission and electrical isolation between two DC buses is also called DC Power Electronic Transformer (DCPET). DCPET is widely used in flexible DC transmission and distribution networks, new energy grid connection, energy Internet and other fields where medium and high voltage bidirectional isolated DC conversion may...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/28H02M3/335H02M3/10H02M3/156
CPCH02M3/10H02M3/156H02M3/28H02M3/33584H02M1/0048Y02B70/10
Inventor 刘建强艾宇杨景熙张泽辉陈少勇赵帅袁宇波史明明刘瑞煌司鑫尧姜云龙肖小龙苏伟孙天奎
Owner BEIJING JIAOTONG UNIV
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