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
CN102710105AInactive Publication Date: 2012-10-03UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
UNIV OF ELECTRONICS SCI & TECH OF CHINA
Publication Date
2012-10-03
Estimated Expiration
Not applicable · inactive patent

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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.
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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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