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CN-121984436-A - Intelligent photovoltaic module

CN121984436ACN 121984436 ACN121984436 ACN 121984436ACN-121984436-A

Abstract

The application relates to an intelligent photovoltaic module, which relates to the technical field of solar energy photovoltaics and comprises a plurality of battery strings and a plurality of junction boxes corresponding to the battery strings, wherein at least one junction box in the plurality of junction boxes is an intelligent junction box, the intelligent junction box comprises a signal circuit, a sampling circuit and a control circuit, the signal circuit is used for demodulating a turn-off signal and a communication signal, the sampling circuit is used for collecting voltage and current, the control circuit is used for controlling the on-off of the intelligent junction box according to the turn-off signal, and the control circuit is also used for adjusting the on-off state inside the intelligent junction box according to the voltage and current under the regulation of tracking MPPT at a maximum power point. The application has the effect of facilitating detection and control of the photovoltaic module.

Inventors

  • WANG WEIHUI
  • DENG XIANGCHUN
  • CHEN YUHANG
  • YAN YAQI

Assignees

  • 浙江佳明电力科技有限公司

Dates

Publication Date
20260505
Application Date
20260203

Claims (10)

  1. 1. The intelligent photovoltaic module is characterized by comprising a plurality of battery strings and a plurality of junction boxes corresponding to the battery strings, wherein at least one junction box in the plurality of junction boxes is an intelligent junction box; The signal circuit is used for demodulating the turn-off signal and the communication signal; The sampling circuit is used for collecting voltage and current; the control circuit is used for controlling the opening and closing of the intelligent junction box according to the turn-off signal; the control circuit is also used for adjusting the switch state in the intelligent junction box according to the voltage and the current under the MPPT regulation and control of the maximum power point tracking.
  2. 2. The intelligent photovoltaic module of claim 1, wherein the battery string comprises a first battery string, a second battery string and a third battery string which are arranged in sequence, the first battery string is electrically connected to the junction box through a first photovoltaic positive output end and a first photovoltaic negative output end, the second battery string is electrically connected to the junction box through a second photovoltaic positive output end and a second photovoltaic negative output end, and the third battery string is electrically connected to the junction box through a third photovoltaic positive output end and a third photovoltaic negative output end.
  3. 3. The intelligent photovoltaic module according to claim 2, characterized in that the intelligent photovoltaic module (3) comprises an intelligent junction box (33), a first junction box (34) and a second junction box (35), the intelligent junction box (33) corresponding to the first battery string, the first junction box (34) corresponding to the second battery string, the second junction box (35) corresponding to the third battery string; The intelligent junction box (33) is arranged at the negative electrode output end (31) of the intelligent photovoltaic module (3), so that the negative electrode output end of the intelligent junction box (33) is the negative electrode output end of the intelligent photovoltaic module (3), the positive electrode input end of the intelligent junction box (33) is electrically connected with the third photovoltaic positive output end through the first connector (36), and the positive electrode output end of the intelligent junction box (33) is the positive electrode output end of the intelligent photovoltaic module (3).
  4. 4. The intelligent photovoltaic module according to claim 2, characterized in that the third photovoltaic positive output is the positive output of the intelligent photovoltaic module (3) with the first connector (36) disconnected.
  5. 5. The intelligent photovoltaic module according to claim 2, wherein a first diode is arranged between the first photovoltaic positive output end and the first photovoltaic negative output end, and the first photovoltaic negative output end is electrically connected with the input end of the sampling circuit (331); The first output end of the sampling circuit (331) is electrically connected to the positive input end of the intelligent junction box (33) through a second switch and a first switch which are connected in series; The second output end of the sampling circuit (331) is electrically connected to the first end of the signal circuit (332), and the second end of the signal circuit (332) is electrically connected with the negative electrode output end of the intelligent junction box (33), and the second output end of the sampling circuit (331) is also electrically connected to the positive electrode of a second diode, and the negative electrode of the second diode is electrically connected with the positive electrode output end of the intelligent junction box (33); The first end of the internal inductor is electrically connected between the second switch and the first switch, and the second end of the internal inductor is electrically connected to the cathode of the second diode.
  6. 6. The intelligent photovoltaic module according to claim 2, characterized in that the intelligent photovoltaic module (4) comprises a third junction box (44), a fourth junction box (45) and an intelligent junction box (43), the third junction box (44) corresponding to the first battery string, the fourth junction box (45) corresponding to the second battery string, the intelligent junction box (43) corresponding to the third battery string; The intelligent junction box (43) is arranged at the positive electrode output end of the intelligent photovoltaic module (4), the negative electrode input end of the intelligent junction box (43) is electrically connected with the first photovoltaic negative output end through a second connector (46), the positive electrode output end of the intelligent junction box (43) is the positive electrode output end of the intelligent photovoltaic module (4), and the negative electrode output end of the intelligent junction box (43) is the negative electrode output end of the intelligent photovoltaic module (4).
  7. 7. The intelligent photovoltaic module according to claim 5, characterized in that in case the positive output of the intelligent junction box (43) is disconnected from other photovoltaic modules, the standby output on the intelligent junction box (43) is the positive output of the intelligent photovoltaic module (4).
  8. 8. The intelligent photovoltaic assembly of claim 7, wherein a third diode is disposed between the third photovoltaic positive output and the third photovoltaic negative output; The third photovoltaic positive output end is electrically connected to a standby output end on the intelligent junction box (4), and is also electrically connected to the input end of the sampling circuit (431) through a first switch and a second switch which are connected in series, wherein the first output end of the sampling circuit (431) is electrically connected with the negative input end of the intelligent junction box (4); The second output end of the sampling circuit (431) is electrically connected to the first end of the signal circuit (432), and the second end of the signal circuit (432) is electrically connected with the negative electrode output end of the intelligent junction box (4), and the second output end of the sampling circuit (431) is electrically connected to the positive electrode of a fourth diode, and the negative electrode of the fourth diode is electrically connected with the positive electrode output end of the intelligent junction box (4); The first end of the internal inductor is electrically connected between the second switch and the first switch, and the second end of the internal inductor is electrically connected to the cathode of the fourth diode.
  9. 9. The intelligent photovoltaic module according to claim 2, characterized in that the intelligent photovoltaic module (5) comprises a first intelligent junction box (51), a second intelligent junction box (52) and a third intelligent junction box (53), the first intelligent junction box (51) corresponding to the first battery string, the second intelligent junction box (52) corresponding to the second battery string, the third intelligent junction box (53) corresponding to the third battery string; The first intelligent junction box (51) is arranged at the negative electrode output end of the intelligent photovoltaic module, and the third intelligent junction box (53) is arranged at the positive electrode output end of the intelligent photovoltaic module.
  10. 10. The intelligent photovoltaic module according to claim 9, wherein the first photovoltaic negative output is electrically connected to an input of the sampling circuit (531); a first output end of the sampling circuit (531) is electrically connected to the first photovoltaic positive output end through a second switch and a first switch which are connected in series; The second output end of the sampling circuit (531) is electrically connected to the first end of the signal circuit (532), and the second end of the signal circuit (532) is electrically connected to the negative electrode output end of the first intelligent junction box (51), the second output end of the sampling circuit (531) is electrically connected to the positive electrode of a fifth diode, and the negative electrode of the fifth diode is electrically connected to the positive electrode output end of the first intelligent junction box (51); the first end of the first internal inductor is connected between the second switch and the first switch, and the second end of the first internal inductor is electrically connected to the cathode of the fifth diode.

Description

Intelligent photovoltaic module Technical Field The application relates to the technical field of solar photovoltaic, in particular to an intelligent photovoltaic module. Background Due to the reproducibility and cleanliness of solar energy, photovoltaic grid-connected power generation technology is rapidly developed. The common photovoltaic system is that a plurality of photovoltaic modules are connected in series to form a group string, and then an inverter is connected to realize that direct current is converted into alternating current and grid connection is realized. In the photovoltaic module, the junction box is a key device for manufacturing the photovoltaic module into a photovoltaic system, a plurality of bypass diodes are arranged in the junction box, each bypass diode is used for shorting one section of battery string into sub-strings, and the junction box mainly plays a role in connecting and protecting the photovoltaic module. Referring to fig. 1, a photovoltaic module 1 includes a plurality of battery strings (illustrated as battery strings 11, 12 and 13), each of which is connected in parallel to a conventional junction box, and the conventional junction boxes are connected in series. The conventional junction boxes may be divided into a negative junction box 14, an intermediate junction box 15, and a positive junction box 16, the negative junction box 14 being connected to a negative electrode 17 of the photovoltaic module, and the positive junction box 16 being connected to a positive electrode 18 of the photovoltaic module. Aiming at the related technology, the real-time running state of the photovoltaic module is difficult to accurately obtain, and the detection and control of the photovoltaic module are affected. Disclosure of Invention In order to facilitate detection and control of the photovoltaic module, the application provides an intelligent photovoltaic module. In a first aspect, the present application provides an intelligent photovoltaic module, which adopts the following technical scheme: the intelligent photovoltaic module comprises a plurality of battery strings and a plurality of junction boxes corresponding to the battery strings, wherein at least one junction box in the plurality of junction boxes is an intelligent junction box; The signal circuit is used for demodulating the turn-off signal and the communication signal; The sampling circuit is used for collecting voltage and current; the control circuit is used for controlling the opening and closing of the intelligent junction box according to the turn-off signal; the control circuit is also used for adjusting the switch state in the intelligent junction box according to the voltage and the current under the MPPT regulation and control of the maximum power point tracking. Through adopting above-mentioned technical scheme, through integrating signal, sampling and control circuit in at least one intelligent terminal box, realized the integration of module level quick turn-off, data monitoring and MPPT function. The design cancels external independent equipment, simplifies the system architecture, reduces the wiring quantity, thereby reducing the installation complexity and the fault risk caused by loose wiring, and facilitating the detection and control of the photovoltaic module. The battery strings comprise a first battery string, a second battery string and a third battery string which are arranged in sequence, wherein the first battery string is electrically connected to the junction box through a first photovoltaic positive output end and a first photovoltaic negative output end, the second battery string is electrically connected to the junction box through a second photovoltaic positive output end and a second photovoltaic negative output end, and the third battery string is electrically connected to the junction box through a third photovoltaic positive output end and a third photovoltaic negative output end. By adopting the technical scheme, the corresponding connection relation between the battery string and the output end is defined, so that a foundation is provided for standardization and modularization design of the internal circuit of the photovoltaic module. The structure enables the integration of intelligent functions to be performed based on clear electrical nodes, lays a reliable physical connection foundation for the follow-up realization of component level monitoring and control, and improves the design feasibility and stability. Optionally, the intelligent photovoltaic module includes an intelligent junction box, a first junction box and a second junction box, the intelligent junction box corresponds to the first battery string, the first junction box corresponds to the second battery string, and the second junction box corresponds to the third battery string; The intelligent junction box is arranged at the negative electrode output end of the intelligent photovoltaic module, so that the negative ele