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Switching power supply lcl resonance control method and device

A switching power supply and resonance control technology, which is applied to output power conversion devices, electrical components, high-efficiency power electronics conversion, etc., can solve problems affecting system stability, achieve simple sampling, suppress LCL resonance, and improve control accuracy.

Active Publication Date: 2021-11-09
SHENZHEN KEHUA HENGSHENG TECH
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Problems solved by technology

[0002] Because the LCL filter has good high-frequency filtering characteristics, it is usually selected as the interface between the switching power supply and the grid, and the switching power supply and the load to improve the quality of the current waveform. However, since the LCL filter is a second-order system, At its resonant frequency, there is a very large resonant spike, thus seriously affecting the system stability

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  • Switching power supply lcl resonance control method and device
  • Switching power supply lcl resonance control method and device
  • Switching power supply lcl resonance control method and device

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specific Embodiment approach

[0067] optional, please refer to figure 1 and image 3 , as a specific implementation of the switching power supply LCL resonance control method provided in the embodiment of the present invention, the current reference value is determined according to the bus capacitor voltage and the preset voltage reference value, including:

[0068] The voltage error value is determined based on the bus capacitor voltage UP+UN and a preset voltage reference value Ubusref.

[0069] Input the voltage error value into the preset voltage loop controller to obtain the current reference value iDref.

[0070] In this embodiment, the preset voltage loop controller may be a proportional-integral controller, or may be a composite controller composed of a proportional-integral controller and a repetitive controller, which is not limited here.

[0071] optional, please refer to figure 1 and image 3 , as a specific implementation of the switching power supply LCL resonance control method provided ...

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Abstract

The present invention provides a switching power supply LCL resonance control method and device. The method includes: obtaining the inductor current at the input side of the LCL filter; extracting the high-frequency component in the inductor current, and The current reference value determines the control quantity of the switching power supply; the switching tubes in the switching power supply are controlled based on the control quantity. The LCL resonance control method and device of the switching power supply provided by the present invention realize the suppression of the LCL resonance of the switching power supply by sampling the inductor current. Compared with the scheme of sampling the capacitor current in the prior art, the sampling difficulty and sampling cost are lower, and the present invention converts the inductor current The high-frequency component of the high-frequency component is added to the calculation of the control quantity as a feedback quantity, which can offset the control quantity of the high-frequency part in the control loop, thereby improving the control accuracy.

Description

technical field [0001] The invention belongs to the technical field of electrical control, and more specifically relates to a method and device for controlling LCL resonance of a switching power supply. Background technique [0002] Because the LCL filter has good high-frequency filtering characteristics, it is usually selected as the interface between the switching power supply and the grid, and the switching power supply and the load to improve the quality of the current waveform. However, since the LCL filter is a second-order system, At its resonant frequency, there is a very large resonant peak, thus seriously affecting the system stability. In order to suppress the LCL resonance in the switching power supply, the technical solution generally adopted in the prior art is: increase the current sampling on the filter capacitor C, and perform circuit control based on the capacitor current. However, this scheme has the following disadvantages: [0003] Capacitive current s...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/217
CPCH02M7/217Y02B70/10
Inventor 张晓博林剑勇梁舒展雷爽樊志强
Owner SHENZHEN KEHUA HENGSHENG TECH
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