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Inverse dead-zone direct power control system and method suitable for direct current transformer

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: 2021-05-14
BEIJING SIFANG JIBAO AUTOMATION +1
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  • Abstract
  • Description
  • Claims
  • 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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  • Inverse dead-zone direct power control system and method suitable for direct current transformer
  • Inverse dead-zone direct power control system and method suitable for direct current transformer
  • Inverse dead-zone direct power control system and method suitable for direct current transformer

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Embodiment Construction

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

[0035] refer to figure 1 , figure 1 A typical topology diagram of an ISOP (Input Series Output Parallel) type DC transformer is shown, which includes multiple DAB (Dual Active Bridge) converters, and each DAB converter is connected in parallel with a capacitor at its input and output terminals. The input terminals of the multiple DAB converters are connected in series to the high voltage direct current bus, and the output terminals of the multiple DAB converters are connected in parallel to the low voltage direct current common bus.

[0036] refer to figure 2 , figure 2A diagram of the DAB converter topology is shown. The DAB converter includes: the primary side H-bridge active inverter switch circuit whose input terminal is connected to the input DC voltage, the output terminal of the primary side H-bridge active inverter switch circuit is connected to the primar...

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Abstract

The invention discloses an inverse dead-zone direct power control method and system for a direct-current transformer. The method comprises the following steps: obtaining a transmission power expression of the direct-current transformer under the condition of considering the dead-zone influence according to the topology and operation characteristics of the direct-current transformer; carrying out PI control on the difference between the actually required power and the actually measured power, and obtaining a power instruction per unit value P2; judging the range of the voltage transformation ratio d; judging the range of the per-unit value P2 of the power instruction; according to different voltage transformation ratios d, the power instruction per unit value P2 and the dead zone time T, obtaining an outward shift ratio d0 value under the corresponding condition through calculation; and sending the out-shift comparison d0 value to a PWM pulse control program, and calculating to obtain a new PWM pulse control instruction. According to the invention, the dead-zone effect can be effectively controlled according to working conditions, so that dead-zone compensation is realized, and the influence of the dead-zone effect of the switching device is reduced. Meanwhile, the open-loop control precision can be effectively improved, and the dynamic response speed of the direct-current transformer is greatly improved.

Description

technical field [0001] The invention relates to an ISOP (input-series-output-parallel) DC transformer composed of a phase-shifted full-bridge DC / DC combination, belonging to the technical field of distribution networks. More specifically, it relates to an inverse dead-zone direct power control system and method for a DC transformer. Background technique [0002] Among many DC converters, the ISOP DC transformer composed of a phase-shifted full-bridge DC / DC combination is a relatively mature DC conversion device, which embodies a huge technical advantage in the application of DC distribution networks. At present, the research on DC transformers mainly focuses on the basic control method of phase-shifted full bridge, switching devices, and the optimal design of high-frequency transformer parameters. [0003] The ISOP type DC transformer is based on the DAB converter (dual active bridge converter). The DAB converter is composed of two full-bridge converters and an intermediate...

Claims

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Application Information

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Patent Type & Authority Applications(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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