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Composite function single-cycle control system and method of power electronic power converter

A single-cycle control and power converter technology, which is applied in the direction of control/regulation system, DC power input conversion to DC power output, output power conversion device, etc., can solve problems such as inability to control bifurcations, and achieve good practical value. The effect of expanding the stable domain and simplifying the structure

Active Publication Date: 2021-11-26
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing single-cycle control cannot control the bifurcation

Method used

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  • Composite function single-cycle control system and method of power electronic power converter
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  • Composite function single-cycle control system and method of power electronic power converter

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Embodiment 1

[0040] Taking the Buck-Boost converter as an example, the control method of a compound function single-cycle control system for a power electronic power converter disclosed in the present invention will be further described in detail in conjunction with the accompanying drawings.

[0041] The main circuit part of the Buck-Boost converter is as follows: figure 1 shown. figure 1 Include the input voltage u in, Switching tube S, diode D, load resistor R, T are switching cycles, inductance L and filter capacitor C. where the inductor current with i L Indicates that the output voltage u o Use to express.

[0042] Taking the circuit inductor current i L and output voltage v o For the state variable x=[u o i L ] T , the state equation of the Buck-Boost converter is established from the operating state of the circuit (two states: the switch tube is on and the switch tube is off):

[0043]

[0044] in

[0045] Use d to represent the switching duty cycle of the Buck-Boo...

Embodiment 2

[0054] This embodiment discloses a complex function single-cycle control system of a power electronic power converter based on a Buck-Boost converter, figure 2 Shown is a composite function single-cycle control system structure diagram. The control system includes: a detection unit, a complex function unit, a multiplier, a reset integrator, a comparator, and an RS flip-flop. The detection unit is directly connected to the external Buck-Boost converter, and the output voltage u of the Buck-Boost converter is detected o , the detected signal is sent to the composite function unit and sent to the reset integrator after passing through the multiplier; at the same time, the reference voltage u ref Send to the compound function unit and get the reference value after passing through the multiplier The reset integrator processes the received signal, and then sends the obtained signal and reference value to the comparator. The output terminal of the comparator is connected to the R...

Embodiment 3

[0056] This embodiment discloses a control method of a composite function single-cycle control system based on a Buck-Boost converter. The control method is based on figure 2 The control system used in the Buck-Boost converter is implemented. The specific workflow of the method is as follows: at the beginning of a cycle, such as the kth switching cycle, firstly, the signal u ref The reference is calculated through the composite function unit and the multiplier value, the output of the integrator is reset to zero at this time. When the clock signal is at a high level, the RS flip-flop is triggered, and the switch S is turned on through its Q terminal. At this time, the integrator pair is reset. Integrating, the output value increases monotonically from the initial value. When the output value of the reset integrator is greater than the reference value, the output terminal of the comparator will generate a reset pulse signal to reset the reset integrator, and the Q terminal...

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Abstract

The invention discloses a composite function single-cycle control system and method of a power electronic power converter, and belongs to the field of voltage converter control. The composite function single-cycle control method disclosed by the invention belongs to a nonlinear control method, and a proper composite function is introduced in a single-cycle control link, and the Jacobian matrix eigenvalue distribution of the control system is influenced, so the bifurcation phenomenon of the control system is eliminated, and the stability domain of the control system is effectively expanded. The stability of the control system can be improved under the condition that main circuit parameters of the control system are not changed, the composite function can be adjusted according to different design requirements, and the method has wide applicability.

Description

technical field [0001] The invention relates to the technical field of power electronics and nonlinear control, relates to a control system and method of a DC / DC converter, and in particular to a compound function single-cycle control system and method of a power electronic power converter. Background technique [0002] DC / DC converters are widely used in industry, communication, consumer electronics and other industries. As a nonlinear system, nonlinear phenomena such as bifurcation and chaos will appear under certain operating conditions. These nonlinear phenomena seriously affect the stability of the system. [0003] Traditional linear control methods cannot solve nonlinear problems. As a nonlinear control method, single-cycle control has been widely used in the control of power electronic converters since it was proposed because of its simple structure and the advantages of suppressing disturbances in one cycle. But the existing single-cycle control cannot control the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/158H02M3/157G06F17/11
CPCH02M3/1582H02M3/157G06F17/11Y02B70/10
Inventor 吴青华郭泳良王磊
Owner SOUTH CHINA UNIV OF TECH
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