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Control method and system for suppressing secondary ripple current and improving dynamic characteristics

A technology of secondary ripple and dynamic characteristics, applied in the direction of irreversible DC power input conversion to AC power output, electrical components, output power conversion devices, etc., can solve the problem of increasing input source power loss and capacity, increasing input side current pulsation, increase the secondary ripple current of the inductor, etc., to improve dynamic characteristics, reduce voltage stress, and ensure normal operation

Inactive Publication Date: 2016-02-03
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

The existence of the secondary ripple current will reduce the efficiency of the DC converter, increase the current ripple on the input side, increase the power loss and capacity of the input source, thereby increasing the system cost and reducing the system efficiency
However, since the feedforward signal i ff Contains all the secondary ripple information, which will lead to the inductor current command i ref Also contains all the secondary ripple information, thereby increasing the secondary ripple current in the inductor

Method used

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  • Control method and system for suppressing secondary ripple current and improving dynamic characteristics
  • Control method and system for suppressing secondary ripple current and improving dynamic characteristics
  • Control method and system for suppressing secondary ripple current and improving dynamic characteristics

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Embodiment Construction

[0033] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, and are not intended to limit the present invention.

[0034] The control strategy of the present invention is: adopt voltage and current double closed-loop control and greatly reduce the cut-off frequency of the voltage loop to suppress the secondary ripple current in the inductor and the DC converter, and use load current feedforward to improve the converter's performance when the load jumps Dynamic characteristics, and at the same time, a double-frequency notch filter is connected in series in the load current feedforward branch to avoid increasing the secondary ripple current in the inductor.

[0035] Figure 8 It is a structure d...

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Abstract

The invention discloses a control method and a system for inhibiting a secondary ripple current and improving a dynamic characteristic. A voltage-current double closed-loop control is carried out on a front-stage direct-current (DC) converter, wherein the secondary ripple current in the front-stage DC converter is inhibited by lowering the cut-off frequency of a voltage loop greatly; a load current feed-forward is adopted on the basis of the double closed-loop control; and a wave trap is added to a feed-forward branch circuit to filter out a double frequency component in a feed-forward signal, thereby inhibiting the second ripple current in the front-stage DC converter and improving the dynamic characteristic of the front-stage DC converter in load hopping. As a result, the efficiency of the DC converter is improved.

Description

technical field [0001] The present invention belongs to the field of power electronic device control, and more specifically, relates to a control method for a front-stage DC converter in a two-stage inverter. The method can be applied to a two-stage single-phase inverter or a two-stage inverter. The two-stage three-phase inverter that can be applied to unbalanced operation can effectively suppress the secondary ripple current in the DC converter, and at the same time greatly improve the dynamic characteristics of the DC converter when the load jumps. Background technique [0002] Two-stage inverters are widely used in occasions where input and output voltages do not match, such as fuel cell power supply systems, solar photovoltaic power generation systems, and uninterruptible power supplies (UPS). Among them, the front-stage DC converter realizes voltage matching and electrical isolation, and the rear-stage inverter converts the direct current obtained by the previous stage ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/14H02M7/44
Inventor 祝国平阮新波王学华
Owner HUAZHONG UNIV OF SCI & TECH
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