PWM rectification type energy feedback device

An energy feedback and improved technology, which is applied in the direction of output power conversion device, AC power input conversion to DC power output, electrical components, etc., can solve the problem of only considering energy feedback power, increasing the electrical stress of the inverter, and filtering difficulties and other issues, to achieve the effect of reducing volume and switching noise, reducing current harmonic content, and reducing hardware complexity
CN101640489AInactive Publication Date: 2010-02-03盈威力新能源科技(上海)有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
盈威力新能源科技(上海)有限公司
Publication Date
2010-02-03
Estimated Expiration
Not applicable · inactive patent

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Abstract

A PWM rectification type energy feedback device, based on improved phase amplitude control and PWM method thereof, estimates optimal value of feedback grid energy according to DC bus voltage and pumpascending rate thereof to be as reference input of an inverter; based on rotary coordinate change and model reference self-adaptive software lock phase ring technology and DSP and DC bus co-groundinginversion output voltage direct detection technology, the output end of the inverter can be precisely detected and avoid from DC component injection into the grid due to member feature drift or parameter change or current leakage. The optimization of feedback grid power causes the current to be in a continuous and relatively constant state, thus reducing current harmonic content injected into thegrid; fixed PWM ensures harmonic component to be fixed and to be high frequency, thus reducing the volume of the output end serial connected inducer and the switch noise; the software lock phase reduces hardware complexity and ensures the detection such as voltage fall, frequency drift and other grid faults to be more reliable.
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Description

technical field

[0001] The invention relates to electrotechnical technology and power electronic technology, in particular to PWM rectification type active inverter technology. The invention is also applicable to new energy grid-connected power generation, especially solar grid-connected power generation. Background technique

[0002] In the existing full-control energy feedback device, its three core technologies, namely modulation technology, feedback energy power control, and synchronous detection, generally work in the following way: modulation is a random square wave pulse obtained by hysteresis loop comparison, The frequency is at the power frequency level and is not fixed, which makes filtering more difficult, and the low-frequency noise generated is extremely harmful to the human body; the energy feedback power only considers the amplitude of the voltage, and does not consider the continuous operation of the current, and the inverter is often on and off. Intermitten...

Claims

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