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Active damping control device for LCL filtering PWM current converter

A technology of damping control and converters, which is applied in the field of converters, can solve problems such as increased cost, difficulty in packaging LCL filters, and increased failure rate of PWM converters, and achieves the effect of improving efficiency and cost

Inactive Publication Date: 2012-10-03
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

No matter which type of active damping control method needs to add a current sensor or voltage sensor on the capacitor branch of the LCL filter or the grid-side inductance branch, such a damping control method will first lead to the PWM converter due to the introduction of the sensor. The increase in the failure rate will also make the overall packaging of the LCL filter more difficult, and will also increase the cost of the system to a certain extent

Method used

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  • Active damping control device for LCL filtering PWM current converter
  • Active damping control device for LCL filtering PWM current converter
  • Active damping control device for LCL filtering PWM current converter

Examples

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Embodiment

[0031] figure 1 It is a control block diagram of a specific embodiment of the active damping control device applied to the LCL filter PWM converter of the present invention.

[0032] In this example, if figure 1 As shown, the LCL filter PWM converter includes two parts: a power circuit and an active damping control device, wherein the dotted line below is the active damping control device applied to the LCL filter PWM converter of the present invention.

[0033] The power circuit part is composed of LCL filter 1, three-phase VSR 2, and DC terminal equipment 3. Firstly, the power grid is connected to the LCL filter 1 and then connected to the three-phase VSR 2 through the other end of the LCL filter 1, and then the three-phase VSR 2 is connected to the DC terminal device 3, thus forming a complete power circuit of the PWM converter.

[0034] The active damping control device includes a PLL phase-locked loop module 5 for a , V b , V c Get the phase angle θ.

[0035] The ab...

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Abstract

The invention discloses an active damping control device for an LCL (Lower Control Limit) filtering PWM (Pulse-Width Modulation) current converter, which is improved to solve the problem that an additional sensor is required to be introduced for active damping control, and a current control structure is innovated. The invention designs a novel AC-side current feedback compensation damping control mode based on a double proportional control module and a band-pass filter. Through current on the AC side, the controlled quantity of the active damping control device is compensated. Firstly, the method is taken as active damping control without additionally arranging a damping resistor and then directly compensates through the current on the AC side, so that the additional sensor is not required to be arranged. The active damping control device has the benefits that on the basis of resonance problem that an LCL filter is restrained to be introduced, the practical damping resistor and the additional sensor are not required to be additionally arranged, so that both the efficiency and the cost of systems can be improved to a certain degree.

Description

technical field [0001] The invention belongs to the technical field of converters, and more specifically relates to an active damping control device applied to an LCL filter PWM converter. Background technique [0002] Compared with the L-type filter, the LCL filter has advantages in volume and cost, so this filtering method is widely used in PWM converters. [0003] However, the LCL filter is a third-order filter structure, which will introduce a resonance, so that when the AC side current feedback method is used, the output of the PWM converter diverges, and the current control will not be able to reach a stable state. Therefore, when using the AC side current feedback mode, it is necessary to introduce damping control to suppress the resonance introduced by the LCL filter, so that the current control of the PWM converter reaches a stable state. [0004] Currently, there are two types of damping control methods: passive damping control and active damping control. [0005...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/12
Inventor 李凯邹见效郑宏徐红兵万亮
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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