CN102025291A

CN102025291A - Photovoltaic assembly with MPPT (Maximum Power Point Tracking) module

Info

Publication number: CN102025291A
Application number: CN2010105962743A
Authority: CN
Inventors: 王宝安; 王玉; 路学刚
Original assignee: Southeast University
Current assignee: Southeast University
Priority date: 2010-12-20
Filing date: 2010-12-20
Publication date: 2011-04-20

Abstract

The invention discloses a photovoltaic module with its own MPPT controller, which includes a photovoltaic cell group and an MPPT controller. The MPPT controller includes an A/D conversion module, an A/D control module, an MPPT module, a PWM module, and an electric bridge. The drive module and the DC/DC module; the input terminal of the A/D conversion module inputs the voltage and current data of the photovoltaic battery pack, the output terminal of the A/D conversion module is connected to the input terminal of the A/D control module; the input terminal of the MPPT module is connected to the A/D D The output terminal of the control module, the output terminal of the MPPT module is connected to the input terminal of the PWM module; the input terminal of the bridge driving module is connected to the output terminal of the PWM module, and the output terminal of the bridge driving module is connected to the DC/DC module for outputting voltage signals. The invention has a built-in MPPT module, which can keep the output of each photovoltaic module at the maximum power point, and effectively improves the efficiency of the photovoltaic system.

Description

Carry the photovoltaic module of MPPT module

Technical field

The present invention relates to a kind of photovoltaic module, belong to the solar photovoltaic grid-connection apparatus field.

Background technology

The conventional photovoltaic system adopts ten to hundreds of photovoltaic module connection in series-parallel to set up.Usually connect earlier by a plurality of battery components and form the photovoltaic module string, will gang up the photovoltaic array that forms in parallel again, be connected on the inverter.This inverter is realized maximal power tracing to whole array, collects electric energy and direct current is converted to interchange to be connected on the electrical network.

The conventional photovoltaic system effectiveness is lower.When several photovoltaic modulies were connected, each all had a slightly different maximum power electric current, and this series system just can not make each assembly export optimal power electric current, thereby causes the loss that do not match.When occurring the partial occlusion problem on the panel, battery performance reduces, and also can cause above-mentioned mismatch problem.Because the requirement of coupling makes also to have certain limitation in system design and roof utilization, has increased the difficulty of the system reform and enlarging simultaneously.In addition,, make this system to monitor to total power output because data can only obtain from inverter, can not be specific to the individual cell in the array, this has brought very big difficulty for system maintenance and trouble hunting.

Summary of the invention

Goal of the invention: at the problem and shortage of above-mentioned existing existence, the invention provides the photovoltaic module of a kind of MPPT of carrying (MPPT maximum power point tracking) controller, can improve the efficient of photovoltaic parallel in system, make each photovoltaic module can both realize maximum power output.

Technical scheme: for achieving the above object, the technical solution used in the present invention is: a kind of photovoltaic module that carries the MPPT controller, it is characterized in that: comprise photovoltaic cell group and MPPT controller, described MPPT controller comprises A/D modular converter, A/D control module, MPPT module, PWM module, bridge-drive module and DC/DC module; Described A/D modular converter input input photovoltaic cell group voltage and current data, the output of A/D modular converter connects the input of the described A/D modular converter of control to the A/D control module of the sampling of voltage and current data; The input of described MPPT module connects the output of A/D control module, and the output of MPPT module connects the input of PWM module; The input of described bridge-drive module connects the output of PWM module, and the output of bridge-drive module connects the DC/DC module of output voltage signal.Described A/D control module, MPPT module and PWM module can realize by the FPGA module.

Described A/D modular converter can be selected one 8 ADC (analog/digital converter) chip for use, realizes the collection to solar cell panel voltages and current data.

Described DC/DC module can be made of 4 MOSFET tube bridges, by controlling the ON time of each MOSFET pipe, realizes the automatic adjusting of the ratio of boosting.

In order accurately to understand the electric current and voltage state of each assembly, also comprise communication module and SPI interface; The input of described communication module connects the output of described A/D control module; The output of described communication module connects the SPI interface.This communication module is delivered to extraneous monitoring station with the voltage and current signal of described A/D control module output by the SPI interface.

Beneficial effect: the present invention carries built-in MPPT module in the photovoltaic module of MPPT module, can make each photovoltaic module output all remain on maximum power point, has effectively improved the efficient of photovoltaic system; And all added the output signal of communication module monitoring A/D control module at each photovoltaic module, monitoring has been refine to component-level, got rid of for system maintenance and fault and brought convenience.

Description of drawings

Fig. 1 is the structural representation of photovoltaic module of the present invention.

Embodiment

Below in conjunction with the drawings and specific embodiments, further illustrate the present invention, should understand these embodiment only is used to the present invention is described and is not used in and limit the scope of the invention, after having read the present invention, those skilled in the art all fall within the application's claims institute restricted portion to the modification of the various equivalent form of values of the present invention.

As shown in Figure 1, the present invention carries the photovoltaic module of MPPT module, comprises 8 ADC chips, A/D control module, MPPT module, PWM module, bridge-drive module, DC/DC module; The input of described 8 ADC chips is gathered the voltage and current value of photovoltaic cell group; Described A/D control module is controlled the sampling of 8 ADC chips to described voltage and current data, and the voltage and current value that sampling obtains is input in the MPPT module; Described MPPT module is calculated the voltage and current value of input, tracks the voltage and current value of power maximum point, and then PWM output waveform duty ratio in the control PWM module; Described PWM module is passed through the ON time of 4 MOSFET pipes in the bridge-drive module controls DC/DC module, thereby adjusts the step-up ratio of DC/DC automatically; The communication module that links to each other with A/D control module output collects the signal of A/D control module output, delivers to extraneous monitoring station by the SPI interface, realizes the monitoring function to photovoltaic module output voltage electric current.

Claims

1. A photovoltaic assembly with a MPPT controller, characterized in that: it comprises a photovoltaic cell group and an MPPT controller, and the MPPT controller includes an A/D conversion module, an A/D control module, an MPPT module, a PWM module, Bridge drive module and DC/DC module; the input terminal of the A/D conversion module inputs the voltage and current data of the photovoltaic cell group, and the output terminal of the A/D conversion module is connected to control the voltage and current data of the A/D conversion module The input end of the sampled A/D control module; the input end of the MPPT module is connected to the output end of the A/D control module, and the output end of the MPPT module is connected to the input end of the PWM module; the input end of the bridge drive module The output terminal of the PWM module is connected, and the output terminal of the bridge driving module is connected with a DC/DC module that outputs a voltage signal. 2. The photovoltaic module with its own MPPT module according to claim 1, wherein the A/D conversion module is an 8-bit ADC chip.

2. The photovoltaic module with its own MPPT module according to claim 1, wherein the DC/DC module is composed of four MOSFET tube bridges.

3. The photovoltaic module with MPPT module according to claim 1, characterized in that: it also includes a communication module and an SPI interface; the input end of the communication module is connected to the output end of the A/D control module; the communication module The output terminal of the module is connected to the SPI interface.