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Active damping control method and system for buck converter constant power load system

A constant power load and damping control technology, applied in the direction of DC power input conversion to DC power output, output power conversion device, control/regulation system, etc., can solve the problems of poor damping characteristics and dynamic response characteristics, and achieve improved dynamic performance. Response, improved system damping, effects to prevent damage to the load

Active Publication Date: 2022-03-29
ZHEJIANG UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art, propose an active damping control method and system for Buck converter constant power load system, and solve the damping characteristics and dynamic response characteristics in the traditional constant power load system control method Poor problems enable the system to quickly adjust and maintain system stability in the face of disturbances such as bus voltage regulation and load mutation

Method used

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  • Active damping control method and system for buck converter constant power load system
  • Active damping control method and system for buck converter constant power load system
  • Active damping control method and system for buck converter constant power load system

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Embodiment 1

[0029] The Buck converter constant power load system includes the pre-stage Buck converter, the post-stage load converter and the load R o .

[0030] Among them, in the front stage Buck converter, u s is the input voltage, L is the filter inductance, R L is the equivalent series resistance of the inductance branch, and C is the filter capacitor.

[0031] The post-stage load converter is a high-bandwidth closed-loop controlled load converter, the load converter and the load R o It can be regarded as a constant power load, and the input voltage and current characteristic curve of the subsequent load converter is as follows: figure 1 As shown, the constant power load has negative impedance characteristics, and the equivalent resistance expression under the small signal model is as follows:

[0032]

[0033] In order to solve the technical problem of poor damping characteristics and dynamic response characteristics in the existing Buck converter constant power load system c...

Embodiment 2

[0090] This embodiment provides an active damping control system for a Buck converter constant power load system. Such as Figure 9As shown, the active damping control system 200 for Buck converter constant power load system includes a signal acquisition module 201 , a voltage outer loop control module 202 , a current inner loop control module 203 , a compensation module 204 and a calculation module 205 .

[0091] Among them, the signal acquisition module 201 is used to acquire the inductor current i of the previous stage Buck converter L and capacitor voltage u o .

[0092] In the pre-stage Buck converter, u s is the input voltage, L is the filter inductance, R L is the equivalent series resistance of the inductance branch, and C is the filter capacitor. Acquire the inductance current i of the front-stage Buck converter through the signal acquisition module 201 L and capacitor voltage u o , and are respectively sent to the voltage outer loop control module 202, the cur...

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Abstract

The invention discloses an active damping control method and system for a Buck converter constant power load system. The method includes: collecting the inductance current and capacitor voltage of the Buck converter, and outputting them after being controlled by the voltage outer loop and the current inner loop PWM switch control signal; collect the inductor current signal of the Buck converter, and output the active damping injection duty cycle signal after active damping compensation; get the optimized Buck conversion according to the PWM switch control signal and the active damping injection duty cycle signal The duty cycle signal of the switch tube. The invention solves the problems of poor damping characteristics and dynamic response characteristics in the traditional constant power load system control method, enables the system to quickly adjust when faced with disturbances such as bus voltage regulation and load mutation, and maintains system stability.

Description

technical field [0001] The invention relates to the technical field of power electronic control, in particular to an active damping control method and system for a Buck converter constant power load system. Background technique [0002] The distributed cascade structure has the advantages of high precision, high efficiency, and low noise, and is widely used in aerospace power systems, computer communication systems, ship power systems, and photovoltaic power generation systems. In a cascaded system, the high-bandwidth closed-loop controlled post-stage load converter often has obvious constant power load characteristics. The constant power load exhibits negative resistance characteristics, which will reduce the damping of the system, thereby affecting the stability of the cascaded system. [0003] For the stability problems caused by constant power loads, the existing solutions are as follows: 1) Passive damping method, that is, connecting resistors in series or in parallel ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/156
CPCH02M3/156
Inventor 包鑫康包慧创王元鸿姚文熙
Owner ZHEJIANG UNIV
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