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Protection method and protection circuit of dual-active full-bridge conversion circuit

A dual-active full-bridge, conversion circuit technology, applied in emergency protection circuit devices, electrical components and other directions, can solve the problem of no protection measures, and achieve improved flexibility and adaptability, improved reliability and safety, fast positioning and The effect of isolation

Active Publication Date: 2020-06-19
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Therefore, the technical problem to be solved by the present invention is to overcome the defect in the prior art that there is no specific protection measure when the DAB converter is installed with a piezoresistor on the secondary DC side, so as to provide a dual active Protection method and protection circuit of full-bridge conversion circuit

Method used

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  • Protection method and protection circuit of dual-active full-bridge conversion circuit
  • Protection method and protection circuit of dual-active full-bridge conversion circuit
  • Protection method and protection circuit of dual-active full-bridge conversion circuit

Examples

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Embodiment 1

[0029] An embodiment of the present invention provides a protection method for a dual-active full-bridge conversion circuit, which is applied to the field of circuit faults and protection, such as figure 1 As shown, the dual-active full-bridge conversion circuit includes a plurality of DAB converters, each DAB converter includes a transformer, a transformer primary-side converter and a transformer secondary-side converter, and each transformer primary-side converter is connected with a rectifier circuit The three-phase AC system is connected, and the DC output terminal of the converter on the secondary side of the transformer is grounded through a varistor, as shown in Figure 2. The protection method includes the following steps:

[0030] Step S11: Obtain the transformer secondary current, the AC grounding branch current and the ground voltage of the DC output terminal of the transformer secondary converter of each dual-active full-bridge converter.

[0031] When the insulatio...

Embodiment 2

[0052] An embodiment of the present invention provides a protection circuit for a dual-active full-bridge converter circuit. The dual-active full-bridge converter circuit includes a plurality of dual-active full-bridge converters, and each dual-active full-bridge converter includes a transformer, a transformer primary side commutator Transformer and transformer secondary side converter, the transformer is a high frequency transformer or medium frequency transformer, the DC output end of the transformer secondary side converter is grounded through a varistor, and the varistor includes a lightning arrester, such as Figure 5 As shown, the protection circuit consists of:

[0053] A plurality of current detection units 1, each of which includes a secondary current transformer, is used to measure the secondary current of each dual-active full-bridge converter.

[0054] Such as figure 1 As shown, a secondary current transformer is set at the position corresponding to I1 or I2 on th...

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Abstract

The invention discloses a protection method and a protection circuit of a dual-active full-bridge conversion circuit. The protection method comprises the following steps: acquiring transformer secondary side current of each dual-active full-bridge converter; judging whether the secondary side current of each transformer exceeds a preset secondary side current threshold value of the transformer ornot; and when the secondary side current of the transformer exceeds the preset secondary side current threshold of the transformer, determining that the corresponding transformer is broken down, and controlling the circuit breaker corresponding to the broken-down transformer to be disconnected. According to the protection method and the protection circuit of the dual-active full-bridge conversioncircuit, the specific position of the specifically broken-down transformer is accurately positioned by judging whether the current of each secondary winding exceeds a preset value or not, the corresponding circuit breaker is rapidly controlled to be disconnected, and thus rapid positioning and isolation of the faults of the dual-active full-bridge conversion circuit are achieved.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a protection method and a protection circuit for a dual-active full-bridge conversion circuit. Background technique [0002] As various forms of distributed power sources and AC and DC loads are connected to the power grid, power electronic transformers are more and more widely used. Dual Active Bridge (DAB) converters are widely used in distributed power generation systems, electric vehicles, renewable energy combined power generation systems, etc. It has a wide range of applications. During the operation of the DAB converter, due to the influence of static electricity, overvoltage, overcurrent and other factors, the switch tube in the converter may have a short circuit or open circuit fault, and the insulation of the primary winding and the secondary winding of the transformer is damaged. wear, thereby endangering the safe operation of the converter. Therefore, faul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/12H02H7/122H02H7/125
CPCH02H7/12H02H7/122H02H7/125
Inventor 马妍君刘依晗于弘洋李继红黄晓明祁欢欢陆振纲邓占锋赵国亮李卫国徐云飞宋洁莹陆翌王朝亮许烽
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD