Multi-transformer push-pull type photovoltaic inverter

A technology of photovoltaic inverters and transformers, applied in photovoltaic power generation, instruments, and regulation of electrical variables, etc., can solve problems such as poor output voltage transient control characteristics, limited load capacity, and large current stress, so as to overcome hysteresis and ensure Effectiveness, quality improvement effect

Inactive Publication Date: 2014-03-26
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0005] In addition, common step-up DC / DC converters can be divided into BOOST, CUK, push-pull, flyback and other types. These DC / DC converters generally have high voltage and current stress, poor isolation characteristics, limited load capacity, and output voltage Shortcomings such as poor transient control characteristics, it is necessary to improve

Method used

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Embodiment Construction

[0040] The preferred embodiments will be described in detail below in conjunction with the accompanying drawings.

[0041] figure 1 It is a hardware structure diagram of the present invention, and the device includes: a DC / DC converter, a DC / AC converter, and a DSP; wherein the DC / DC converter includes: first field effect transistors to sixth field effect transistors Q1 to Q6, power Driver U1, first to sixth resistors R1 to R6, first to sixth capacitors C1 to C6, first to third push-pull transformers T1 to T3, rectifier bridge ZQ, battery voltage sensor V1, second A signal conditioning circuit TL1; the DC / AC converter includes: the seventh field effect transistor to the tenth field effect transistor Q7 ~ Q10, the H bridge driver chip U2, the output voltage sensor V2, the output current sensor I, the filter LB, the second Signal conditioning circuit TL2, third signal conditioning circuit TL3.

[0042] In the embodiment, the DSP in the circuit is a high-performance floating-po...

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Abstract

A multi-transformer push-pull type photovoltaic inverter comprises a DSP, a DC / DC convertor, a DC / AC convertor and a filter, wherein the DC / DC convertor, the DC / AC convertor and the filter are sequentially connected, and a composite controller which is composed of a PI controller of the DC / AC convertor, an artificial neural network model and a feed-forward arithmetic unit is arranged in the DSP. The input end of the artificial neural network model is connected with the state variable of the DC / AC convertor in the kappath sampling period, a predicted value of the output voltage which is outputted by the artificial neural network model in the (kappa+1)th sampling period is connected with the negative input end of the feed-forward arithmetic unit, the positive input end of the feed-forward arithmetic unit is connected with a set value of voltage at the kappa moment, and an output signal of the feed-forward arithmetic unit is connected with an output signal of he PI controller and then controls the duty ratio of the DC / AC convertor. According to the multi-transformer push-pull type photovoltaic inverter, the output voltage of the inverter at the next moment is predicted through the neural network model, compensation for the duty ratio at the present moment is timely conducted through the feed-forward arithmetic unit, and therefore the hysteresis quality of the PI controller is overcome, and the robustness of the inverter system is improved.

Description

technical field [0001] The invention relates to a multi-transformer push-pull two-stage inverter device suitable for an independent photovoltaic power generation system, which belongs to the technical field of photovoltaic power generation. Background technique [0002] With the increasingly serious energy crisis and environmental pollution, solar photovoltaic power generation, as a clean and green energy, has become a focus of attention and research around the world. [0003] The inverter is a power electronic device that converts DC power into AC power, and is an important part of realizing independent photovoltaic power generation applications. Since the DC voltage output by a single photovoltaic cell module is low, it is necessary to boost the low DC voltage through a DC / DC converter first, and then output a standard AC voltage through a DC / AC conversion circuit. [0004] Most of the existing photovoltaic inverters are controlled by simple PID controllers, which have th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/5387H02M7/539H02M3/335
CPCY02E10/56
Inventor 马良玉马云龙刘卫亮林永君刘长良马进陈文颖马永光
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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