A low-frequency current ripple suppression digital control device for bridge micro-inverter
A bridge-type micro-inverter and low-frequency current technology, which is applied to circuit devices, output power conversion devices, and AC power input to DC power output. It can solve the problem of high cost and achieve the effect of control
Active Publication Date: 2018-08-10
北京索科曼正卓智能电气有限公司
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Problems solved by technology
The common method to achieve the above-mentioned power decoupling and eliminate the electrolytic capacitor is to eliminate the low-frequency ripple in the input side current of the micro-inverter. The current common method either increases relevant hardware circuits or adopts complex control to realize it, and its implementation cost Relatively high
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[0016] Below in conjunction with specific embodiment, further illustrate the present invention, should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention, after having read the present invention, those skilled in the art will understand various equivalent forms of the present invention All modifications fall within the scope defined by the appended claims of the present application.
[0017] figure 1 It is the main circuit diagram of the bridge-type photovoltaic micro-inverter in the embodiment of the present invention, the driving signal of the switching tube and the main voltage and current waveforms in one switching cycle are as follows figure 2 , the figure describes in detail the positional relationship between the four switch tubes in the full bridge circuit and the voltage at the input end of the buffer inductor L. The drive signal of the switch tube directly determines...
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The invention discloses a low-frequency current ripple inhibition digital control strategy suitable for a bridge type micro inverter and provides a low-frequency current ripple inhibition digital control apparatus of a bridge type micro inverter. The strategy is realized through a DSP digital chip and is composed of an analog / digital conversion module, a maximum power point tracking module, a duty ratio prediction calculation module, a signal amplifier module and a signal conditioning module. According to the invention, inhibition of low-frequency current ripples at the input side of the micro inverter can be realized simply by use of the simple control strategy, and the low-frequency current ripple inhibition digital control apparatus of the bridge type micro inverter has the advantages of high ripple inhibition rate, convenient control realization, low cost and the like.
Description
technical field [0001] The invention relates to a low-frequency current ripple suppression digital control device applied to a bridge micro-inverter, belonging to the technical field of power electronic converter control. Background technique [0002] The common topology of photovoltaic micro-inverters is based on low-power circuits, such as flyback or forward circuits. With the gradual increase of the power of a single photovoltaic cell, parallel converters are generally used to achieve capacity expansion. Filter optimization. At present, the improvement of photoelectric conversion efficiency has made the power of a single photovoltaic cell more and more large. At present, the power of a single photovoltaic cell commonly seen in the market has reached 350W. It is foreseeable that the power of a single photovoltaic cell will continue to increase in the future, and the power of a single forward 1. The flyback circuit can only convert efficiently within a suitable power range...
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IPC IPC(8): H02M7/5387H02M1/14H02J3/38
CPCH02J3/385H02M1/14H02M7/53873Y02E10/56
Inventor 吴云亚阚加荣冯赛非商志根薛迎成姚志垒
Owner 北京索科曼正卓智能电气有限公司