Wide-range bidirectional conversion circuit and control method

A technology of bidirectional conversion and bidirectional converter, which is applied in control/regulation systems, conversion equipment using Cuk converters, DC power input conversion to DC power output, etc., and can solve problems such as difficult efficiency of two-stage power conversion systems

Inactive Publication Date: 2020-04-24
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The control of this scheme is flexible, but how to improve the system efficiency of two-stage power conversion is a ma...

Method used

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  • Wide-range bidirectional conversion circuit and control method

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Embodiment 1

[0066] Embodiment 1: Wide DC voltage input, wide AC voltage output bidirectional conversion topology

[0067] Such as figure 2 As shown, the wide-range bidirectional conversion circuit of the present invention adopts a three-stage bidirectional converter design, including non-isolated / isolated bidirectional direct current / direct current converter (DC / DC), direct current / communicating current (DC / AC) bidirectional converter and system control unit.

[0068] When the converter works in the forward direction, the DC power supply or energy storage equipment realizes grid-connected energy feedback through non-isolated DC / DC converters, isolated DC / DC converters, and DC / AC inverters; when it works in the reverse direction, the AC voltage is rectified Circuits, isolated DC / DC converters, and non-isolated DC / DC converters supply power to DC loads or charge energy storage devices. The non-isolated DC / DC converter is an interleaved parallel CUK converter, which has the ability to work ...

Embodiment 2

[0085] Embodiment 2: The bidirectional transformation topology control method of wide DC voltage input and wide AC voltage output of the present invention:

[0086] The wide DC voltage input and wide AC voltage output bidirectional conversion topology control method of the present invention mainly includes a forward working control scheme:

[0087] 1. The control scheme when working in the forward direction is as follows:

[0088] First, in the working state of constant current mode:

[0089] Cuk input current I in The sampling circuit is input to the DSP, and the sampling signal i in with input current reference i in_ref For comparison, the error signal is calculated by the proportional-integral-differential controller (PID) in the DSP, and compared with the triangular carrier to obtain a pulse width modulation (PWM) signal and input to the isolated drive circuit to control the duty cycle of the Cuk converter switch tube respectively. Control input current i in equal to ...

Embodiment 3

[0096] Embodiment 3: The bidirectional transformation topology control method of wide DC voltage input and wide AC voltage output of the present invention:

[0097] The bidirectional conversion topology control method for wide DC voltage input and wide AC voltage output of the present invention, the control scheme during reverse operation is as follows:

[0098] Bus voltage V bus2 with its reference voltage V bus2_ref For comparison, after the error signal is calculated by the PI controller, it is compared with the absolute value of the grid voltage |v ac |Multiply to get grid current reference i g_ref ;grid current reference i g_ref and grid current i g The error signal is obtained by comparison. After the error signal is calculated by the PI controller, it is compared with the triangular carrier wave to obtain the PWM signal and input to the optocoupler isolation drive circuit to control the AC / DC converter switch tube (S 1 ~S 4 ) duty cycle size, control the output bu...

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Abstract

The invention discloses a wide-range bidirectional conversion circuit and a control method. The wide-range bidirectional conversion circuit comprises a three-stage bidirectional converter and a control unit, and the three-stage bidirectional converter is formed by sequentially connecting a non-isolated DC/DC converter, an isolated DC/DC converter and a DC/AC inverter. When the system works in theforward direction, a direct-current power supply or energy storage equipment realizes grid-connected energy feedback through the non-isolated DC/DC converter, the isolated DC/DC converter and the DC/AC inverter; and during reverse working, an alternating voltage supplies power to a direct-current load or charges an energy storage device through a rectifying circuit, the isolated DC/DC converter and the non-isolated DC/DC converter. In order to adapt to different power levels and realize higher input current ripple control, the non-isolated converter adopts a multi-phase interleaved parallel structure; and in order to further broaden the requirements of input and output ranges in practical application, the isolated converter can be controlled by adopting a full-bridge/half-bridge variable structure. The whole system has the advantages of wide input direct-current voltage range, wide output alternating-current voltage range, wide load range, small current ripple, high-frequency isolation, high efficiency, energy conservation, environmental protection and the like.

Description

technical field [0001] The invention discloses a bidirectional conversion topology with wide DC voltage input and wide AC voltage output, which belongs to the technical field of power electronic converters and is suitable for multi-electric aircraft power supply systems, battery energy storage devices, hybrid wind-solar complementary systems, electric vehicles and hybrid power automotive and other fields. Background technique [0002] In order to improve the stability and efficiency of distributed power systems and make full use of renewable energy, microgrids have attracted extensive attention from scholars at home and abroad, among which grid-connected bidirectional DC / AC converters are an important part. According to the state of the input and output, the bidirectional DC / AC converter needs to realize both the function of the rectifier and the function of the inverter. At present, bidirectional DC / AC converters are mainly used in the fields of multi-electric aircraft pow...

Claims

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Application Information

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IPC IPC(8): H02M3/155H02M3/335H02M7/797H02M1/14
CPCH02M1/14H02M3/005H02M3/155H02M3/33584H02M7/797
Inventor 任小永朱昕昳张之梁陆懿晨李加明杨勇陈乾宏
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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