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Switching power supply LCL resonance control method and device

A switching power supply and resonance control technology, applied in output power conversion devices, electrical components, high-efficiency power electronic conversion and other directions, can solve problems such as affecting system stability, and achieve the effect of simple sampling, low sampling cost, and suppression of LCL resonance.

Active Publication Date: 2021-02-23
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 with 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 with image 3 , as a specific implementation of the switching power supply LCL resonance control method provide...

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Abstract

The invention provides a switching power supply LCL resonance control method and device. The method comprises the following steps: obtaining an inductive current of an input side of an LCL filter; extracting a high-frequency component in the inductive current, and determining a control quantity of a switching power supply based on the inductive current, a high-frequency component and a preset current reference value; and controlling a switching tube in the switching power supply based on a control quantity. According to the switching power supply LCL resonance control method and device, suppression of LCL resonance of the switching power supply is achieved by sampling the inductive current, compared with the scheme of sampling a capacitive current in the prior art, by using the method of the invention, sampling difficulty and sampling cost are lower, and the high-frequency component of the inductive current serves as a feedback quantity to be added into calculation of the control quantity so that the control quantity of a high-frequency part in a control loop can be offset, and control precision is improved.

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...

Claims

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Application Information

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Patent Type & Authority Applications(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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