Alternating-current phasor analysis method and modeling method for phase-shifting control dual active bridge direct-current converters

A DC converter, dual active bridge technology, applied in the direction of converting DC power input to DC power output, adjusting electrical variables, controlling/regulating systems, etc. Universal model, unclear physical meaning, etc., to achieve the effect of clear physical meaning, simplified calculation, and simple operation

Inactive Publication Date: 2015-11-25
CHINA UNIV OF MINING & TECH (BEIJING)
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Problems solved by technology

Its main disadvantages are that the calculation is complicated, the physical meaning is not clear, and the analysis results cannot directly reflect the relat

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  • Alternating-current phasor analysis method and modeling method for phase-shifting control dual active bridge direct-current converters
  • Alternating-current phasor analysis method and modeling method for phase-shifting control dual active bridge direct-current converters
  • Alternating-current phasor analysis method and modeling method for phase-shifting control dual active bridge direct-current converters

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Embodiment Construction

[0061] Below in conjunction with accompanying drawing and specific embodiment with figure 1 The shown dual active H-bridge DC converter topology is taken as an example to further illustrate the present invention.

[0062] image 3 Shown are three phase-shift control strategies: single phase-shift, extended phase-shift, double phase-shift control ideal waveform diagram; among them, V ab (t), V cd (t) is the AC side square wave voltage of two single-phase H-bridges, with the phase of the driving signal S1 as the reference phase, the phase delay between the driving signal S4 and S1 is called the inner phase angle α of H1 1 ; The phase delay between the driving signal Q1 and S1 is called the external phase angle α 2 ; The phase delay between the driving signal Q4 and S1, that is, the internal phase shift angle α of H2 4 and external phase angle α 2 The sum is called α 3 (α 3 = α 2 +α 4 ).

[0063] Taking H1 ahead of H2 as an example, three phase-shift control strategies ...

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Abstract

The invention provides alternating-current phasor analysis method and small signal model modeling method suitable for dual-active bridge (dual active H bridges, dual three-level half bridges or a three-level half bridge on one side and an active H bridge on the other side and the like) direct-current converters in all phase-shifting controls. The alternating-current phasor analysis method and small signal model modeling method comprise the specific steps as follows: (1) an alternating current side of each active bridge is equivalent to two square-wave voltage sources through equivalence, and square-wave voltage is decomposed into superposition of sinusoidal voltage through Fourier series decomposition to obtain phasor expressions, as shown in the specification, of (2n+1)th component voltage and inductive current; (2) phasor diagrams of control characteristics and control ranges under different phase-shifting controls are obtained according to the phasor expressions in the step 1; (3) complex power, as shown in the specification, of the (2n+1)th component is obtained according to the phasor expressions in the step 1, and active and reactive power characteristics of the dual-active bridge direct-current converters under different phase-shifting controls are analyzed; and (4) time domain Fourier series and expressions of the voltage and the current are obtained according to the phasor expressions in the step 1, so as to obtain a unified signal model suitable for all phase-shifting control methods.

Description

technical field [0001] The invention belongs to the field of power electronics technology and smart grid research, and in particular relates to a phase shift control dual active bridge circuit power analysis method and modeling based on a phasor method. Background technique [0002] With the development of smart grids, high-power power electronic converters without power frequency transformers have attracted more and more attention due to their high efficiency, intelligence, and low pollution. At present, the common high-power power electronic converter without industrial frequency transformer adopts cascaded topology, which is composed of cascaded multi-level AC-DC rectification module, bidirectional DC-DC conversion module and multi-level DC-AC inverter module. [0003] The dual active bridge DC-DC converter structure is adopted by the bidirectional DC-DC conversion module due to its characteristics of electrical isolation, buck-boost conversion, bidirectional energy trans...

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Application Information

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IPC IPC(8): H02M3/335G06F19/00
Inventor 王聪沙广林王健宇胡小菊马志鹏程红王俊庄园王浩
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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