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A system and method for inverse dead-zone direct power control suitable for DC transformers

A DC transformer and power control technology, applied in the field of distribution network, can solve problems such as the large dead zone effect, achieve the effects of dead zone compensation, improve open-loop control accuracy, and improve dynamic response speed

Active Publication Date: 2022-06-03
BEIJING SIFANG JIBAO AUTOMATION +1
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  • Abstract
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  • Application Information

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Problems solved by technology

At the same time, due to the increase of switching frequency, it will bring more and more dead zone effect.

Method used

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  • A system and method for inverse dead-zone direct power control suitable for DC transformers
  • A system and method for inverse dead-zone direct power control suitable for DC transformers
  • A system and method for inverse dead-zone direct power control suitable for DC transformers

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Embodiment Construction

[0034] The present invention will be further described below in conjunction with the accompanying drawings and examples.

[0036] Referring to FIG. 2, FIG. 2 shows a DAB converter topology diagram. The DAB converter includes: the input terminal and the input DC

[0043]

[0044]

[0045]

[0047] The definition of the external shift ratio d0 is: the external shift phase angle that exists between the control pulses of the primary and secondary side switching circuits=d0*π.

[0050] When the voltage transformation ratio d of the DC transformer is greater than 1, if the primary and secondary side switching circuits control the external shift between the pulses

[0051] When the voltage transformation ratio of the DC transformer is d=1, if the primary and secondary side switching circuits control the external shift between the pulses

[0053] In step S2: judging the range of the voltage transformation ratio d, obtain the d value through the formula d=n*Udc2 / Udc1, and then judge

[005...

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Abstract

The invention discloses an inverse dead-zone direct power control method and system of a DC transformer, comprising: obtaining the transmission power expression of the DC transformer considering the influence of the dead zone according to the topology and operating characteristics of the DC transformer; calculating the actual required power Perform PI control on the difference with the actual measured power to obtain the power command per unit value P2; judge the range of the voltage transformation ratio d; judge the range of the power command per unit value P2; The dead time T is calculated to obtain the d0 value of the outer shift ratio in the corresponding situation; the outer shift ratio d0 value is sent to the PWM pulse control program, and a new PWM pulse control command is calculated. The invention can effectively control the dead zone effect according to working conditions, thereby realizing dead zone compensation and reducing the influence of the dead zone effect of switching devices. At the same time, it can effectively improve the accuracy of open-loop control and greatly improve the dynamic response speed of the DC transformer.

Description

Inverse dead zone direct power control system and method suitable for DC transformers technical field The present invention relates to the ISOP (input series output parallel) type DC transformer that phase-shifting full-bridge DC / DC combination forms, It belongs to the technical field of distribution network. More specifically, it relates to a direct power control system and method for inverse dead zone of a DC transformer. Background technique Among many DC converters, the ISOP type DC transformer formed by the phase-shifting full-bridge DC / DC combination is regarded as the most developed DC transformer. As a mature DC conversion device, it has shown great technical advantages in the application of DC distribution network. Current DC Transformers The research mainly focuses on the basic control method of the phase-shifted full-bridge, switching devices, and the optimal design of high-frequency transformer parameters. ISOP type DC transformer takes DAB converter (d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335H02M1/38
CPCH02M3/33584H02M1/38Y02B70/10
Inventor 周俊王一李思梅红明刘树王皆庆
Owner BEIJING SIFANG JIBAO AUTOMATION
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