WO2023155463A1

WO2023155463A1 - Photovoltaic power supply system

Info

Publication number: WO2023155463A1
Application number: PCT/CN2022/126646
Authority: WO
Inventors: 张毅; 张彦忠; 姚科奇; 林松枝
Original assignee: 华为数字能源技术有限公司
Priority date: 2022-02-16
Filing date: 2022-10-21
Publication date: 2023-08-24
Also published as: CN114640128A

Abstract

The present application provides a photovoltaic power supply system. The photovoltaic power supply system comprises a plurality of photovoltaic arrays, a plurality of wiring devices, and at least one current collection device; the number of photovoltaic power generation units comprised in each of the plurality of photovoltaic arrays is smaller than or equal to the ratio of a maximum working current of the photovoltaic power generation units to a rated working current thereof; the current collection device is used for transmitting output currents of the photovoltaic arrays to a load by means of the wiring devices connected to the photovoltaic arrays. By means of the present application, the abnormal working current borne by a photovoltaic power generation unit when the photovoltaic power generation unit is short-circuited does not exceed the maximum working current thereof, the safety of the photovoltaic power supply system is improved, and the service life of the photovoltaic power supply system is prolonged. Moreover, by means of the present application, one photovoltaic array can comprise as many photovoltaic power generation units as possible; thus, the photovoltaic power generation area of the photovoltaic power supply system is increased, the power supply efficiency is improved, and the production cost is reduced.

Description

Photovoltaic power supply system

This application claims the priority of the Chinese patent application with the application number 202210143562.6 and the application title "Photovoltaic Power Supply System" filed with the China Patent Office on February 16, 2022, the entire contents of which are incorporated in this application by reference.

technical field

The present application relates to the technical field of power electronics, in particular to a photovoltaic power supply system.

Background technique

With the development of power electronics technology, in order to better convert solar energy into electrical energy, in the field of photovoltaic power supply, the photovoltaic power supply equipment (for example, photovoltaic array) in the photovoltaic power supply system is usually integrated and installed in a fixed position (for example, the The photovoltaic array is arranged in the glass of the building) to convert the received light energy or solar energy into electrical energy through photovoltaic power supply equipment to supply power to the load. Since the power supply of the photovoltaic power supply equipment is related to the area of the photovoltaic power supply equipment that can receive light energy or solar energy (for example, it is related to the area of the power generation device in the photovoltaic power supply equipment). However, since photovoltaic power supply equipment (for example, a photovoltaic array) is usually composed of multiple photovoltaic power generation units connected, for example, multiple photovoltaic power generation units are connected in parallel, and the output (for example, output current) after parallel connection is used as the output of the photovoltaic array as a load powered by. When a photovoltaic power generation unit is short-circuited, because the internal resistance of the short-circuit photovoltaic power generation unit becomes smaller, the output current of other photovoltaic power generation units will flow to the short-circuit photovoltaic power generation unit. The short-circuit current of other photovoltaic power generation units in the photovoltaic power generation unit, the current value of this short-circuit current is usually far beyond the maximum operating current that a single photovoltaic power generation unit can withstand, which can easily cause damage to photovoltaic power supply equipment, and the safety of photovoltaic power supply system is low.

Contents of the invention

This application provides a photovoltaic power supply system, which can make the abnormal working current of the photovoltaic power generation unit not exceed the maximum working current when a short circuit occurs, improve the safety of the photovoltaic power supply system, prolong the service life of the photovoltaic power supply system, and at the same time make a The photovoltaic array can include as many photovoltaic power generation units as possible, thereby increasing the photovoltaic power generation area of the photovoltaic power supply system, improving power supply efficiency, and reducing production costs.

In a first aspect, the present application provides a photovoltaic power supply system, which includes a plurality of photovoltaic arrays, a plurality of wiring devices, and at least one confluence device. Here, a plurality of photovoltaic power generation units included in one of the plurality of photovoltaic arrays can be connected in parallel to one of the plurality of wiring devices, and the number of photovoltaic power generation units included in each photovoltaic array of the plurality of photovoltaic arrays is less than or equal to the number of photovoltaic power generation units included in the photovoltaic array. The ratio of the maximum operating current of the generating unit to the rated operating current. Here, each photovoltaic array among the plurality of photovoltaic arrays can be connected in parallel to the input end of the current confluence device through the wiring device connected to each photovoltaic array, and the output end of the current confluence device can be connected to a load. Here, the current combining device can be used to transmit the output current of each photovoltaic array to the load through the wiring device connected to each photovoltaic array.

In the embodiments provided in this application, a photovoltaic array in a photovoltaic power supply system may include multiple photovoltaic power generation units. Here, the number of photovoltaic power generation units is less than or equal to the ratio of the maximum operating current of the photovoltaic power generation units to the rated operating current. It can be understood that if the maximum working current of a photovoltaic power generation unit is K times the rated working current, then a photovoltaic array can contain up to K photovoltaic power generation units, (here K is a natural number, when K is not an integer, then down Rounding). That is to say, the photovoltaic power supply system can limit the number of photovoltaic power generation units in each photovoltaic array, thereby ensuring that in a photovoltaic array, if a photovoltaic power generation unit short-circuits, the fault operating current in the short-circuit faulty photovoltaic power generation unit will (for example, the current that is converged into the short-circuited photovoltaic power generation unit by the output current of other non-faulty photovoltaic power generation units) does not exceed the maximum operating current of the photovoltaic power generation unit (that is, does not exceed the maximum operating current that the photovoltaic power generation unit can withstand current). At the same time, each photovoltaic array in the photovoltaic array can be connected to the confluence device in parallel through the wiring device connected to each photovoltaic array, and the output current of each photovoltaic array is transmitted to the load through the wiring device and the confluence device. By adopting the implementation method provided by this application, the abnormal operating current that the photovoltaic power generation unit bears when a short circuit occurs does not exceed the maximum operating current, which improves the safety of the photovoltaic power supply system and prolongs the service life of the photovoltaic power supply system. At the same time, it can also make a photovoltaic array As many photovoltaic power generation units as possible can be included, thereby increasing the photovoltaic power generation area of the photovoltaic power supply system, improving power supply efficiency, and reducing production costs.

With reference to the first aspect, in a first possible implementation manner, the flow confluence device may include a plurality of anti-inflow modules, and one wiring device among the plurality of connection devices may be connected to the flow confluence device through one of the plurality of anti-inflow modules. Here, the positive pole of each wiring device among the plurality of wiring devices can be connected to the positive input end of the confluence device through each of the multiple anti-influx modules, and the negative pole of each wiring device can be connected to the negative input end of the confluence device. Here, the current confluence device can be used to prevent other non-short-circuited photovoltaic arrays from outputting current to any short-circuited photovoltaic array through each anti-backflow module when any photovoltaic array is short-circuited. It can be understood that when a photovoltaic power generation unit in a photovoltaic array is short-circuited, the equivalent resistance of the faulty photovoltaic array will become smaller. Flowing to the load, but backflowing into the failed photovoltaic array, not only hinders the photovoltaic power supply system from supplying energy to the load, but also endangers the safety of components in the photovoltaic system (for example, photovoltaic power generation units in the failed photovoltaic array). Using the implementation method provided by this application, when any photovoltaic array is short-circuited, the current confluence device can prevent other non-short-circuited photovoltaic arrays from outputting current to any short-circuited photovoltaic array through each anti-backflow module, thereby improving the safety of the photovoltaic power supply system , while prolonging the service life of the photovoltaic power supply system, it ensures that the output current of each photovoltaic array is normally transmitted to the load, which improves the stability and work efficiency of the photovoltaic power supply system.

In combination with the first aspect or the first possible implementation manner of the first aspect, in the second possible implementation manner, the anti-backflow module can be a diode, a metal oxide semiconductor field effect transistor MOSFET, a gallium nitride transistor GaNHEMT or an insulated gate The bipolar transistor IGBT enriches the component selection and applicable scenarios of the photovoltaic power supply system.

In combination with the first aspect or the first possible implementation manner of the first aspect or the second possible implementation manner of the first aspect, in the third possible implementation manner, the photovoltaic power supply system may further include multiple sets of transmission lines, multiple A photovoltaic array in the photovoltaic array can be connected to one wiring device in the plurality of wiring devices through a group of transmission lines in multiple groups of transmission lines. Here, the photovoltaic arrays of the photovoltaic power supply system can be symmetrically arranged in the photovoltaic power supply system to form a photovoltaic array group, and the wiring devices corresponding to each photovoltaic array can be arranged symmetrically at each side edge of the photovoltaic array group. overlap. Here, the symmetrical arrangement of the photovoltaic arrays in the photovoltaic power supply system in the photovoltaic power supply system may include axisymmetric arrangement, central symmetrical arrangement or other arrangements in which the transmission lines corresponding to the photovoltaic arrays do not overlap. It can be understood that when a photovoltaic array group includes two photovoltaic arrays, the two photovoltaic arrays can be symmetrically arranged laterally, and correspondingly, the wiring devices corresponding to the two photovoltaic arrays can be arranged symmetrically on the left and right edges of the photovoltaic array group (or the wiring devices corresponding to the two photovoltaic arrays can be arranged symmetrically on the upper or lower edge of the photovoltaic array group at the same time), so that the transmission lines corresponding to each photovoltaic array do not overlap; or, the two photovoltaic arrays can be longitudinally symmetrically arranged Correspondingly, the wiring devices corresponding to the two photovoltaic arrays can be symmetrically arranged on the upper and lower edges of the photovoltaic array group (or the corresponding wiring devices of the two photovoltaic arrays can be symmetrically arranged on the left side or the lower side of the photovoltaic array group at the same time) right edge), so that the transmission lines corresponding to each photovoltaic array do not overlap. It can be further understood that when a photovoltaic array group includes more than two photovoltaic arrays, each photovoltaic array can be extended and arranged according to the symmetrical arrangement of two photovoltaic arrays when a photovoltaic array group includes two photovoltaic arrays, or can be arranged according to the central symmetry At the same time, the wiring devices corresponding to each photovoltaic array can be symmetrically arranged at each side edge of the photovoltaic array group, so that the transmission lines corresponding to each photovoltaic array do not overlap.

Using the implementation method provided by this application, the wiring devices corresponding to each photovoltaic array can be symmetrically arranged at the side edges of the photovoltaic array group, and on the basis of ensuring that the transmission lines corresponding to each photovoltaic array do not overlap, the arrangement is flexible and diverse. It adapts to different application scenarios and improves the applicability of the photovoltaic power supply system.

With reference to the first aspect or the first possible implementation manner of the first aspect or the second possible implementation manner of the first aspect, in the fourth possible implementation manner, the photovoltaic power supply system may further include multiple sets of transmission lines, multiple A photovoltaic array in the photovoltaic array can be connected to one wiring device in the plurality of wiring devices through a group of transmission lines in multiple groups of transmission lines. Here, the photovoltaic arrays of the photovoltaic power supply system can be arranged side by side in the photovoltaic power supply system to form a photovoltaic array group, and the wiring devices corresponding to at least two photovoltaic arrays in the photovoltaic array group can be arranged on the same side edge of the photovoltaic array group. The overlapping part of the transmission line corresponding to the photovoltaic array can be insulated. Here, the parallel arrangement of the photovoltaic arrays in the photovoltaic power supply system in the photovoltaic power supply system may include horizontal parallel arrangement, vertical parallel arrangement, or other arrangements in which transmission lines corresponding to the photovoltaic arrays overlap. Here, the wiring devices corresponding to each photovoltaic array can be collectively arranged at the edge of the same side of the photovoltaic array group, or separately arranged at multiple side edges of the photovoltaic array group. It can be understood that when a photovoltaic array group includes two photovoltaic arrays, the two photovoltaic arrays can be arranged side by side in a horizontal direction, and correspondingly, the wiring devices corresponding to the two photovoltaic arrays can be centrally arranged on the left or right side of the photovoltaic array group At the edge, the overlapping parts of the transmission lines corresponding to each photovoltaic array can be insulated; or, two photovoltaic arrays can be arranged side by side vertically, and correspondingly, the wiring devices corresponding to the two photovoltaic arrays can be centrally arranged in the photovoltaic array group. At the upper or lower edge, the overlapping parts of the transmission lines corresponding to each photovoltaic array can be insulated. It can be further understood that when a photovoltaic array group includes more than two photovoltaic arrays, each photovoltaic array can be extended according to the horizontal or vertical arrangement when a photovoltaic array group includes two photovoltaic arrays, or can be arranged according to the horizontal N PV arrays * M PV arrays are arranged side by side in the vertical direction (here N and M are integers), and at the same time, the wiring devices corresponding to each PV array can be centrally arranged on the same side edge of the PV array group, or separately centralized Arranged at the edges of multiple sides of the photovoltaic array group, the overlapping parts of the transmission lines corresponding to each photovoltaic array can be insulated.

Using the implementation mode provided by this application, the wiring devices corresponding to each photovoltaic array can be arranged collectively at the same side edge of the photovoltaic array group or separately concentrated at multiple side edges of the photovoltaic array group. At the same time, for each photovoltaic array corresponding The overlapping parts of the transmission lines can be insulated. While ensuring the safe insulation between the corresponding transmission lines of each photovoltaic array, the arrangement is flexible and diverse, which can adapt to different application scenarios and improve the applicability of the photovoltaic power supply system.

In combination with the fourth possible implementation of the first aspect, in the fifth possible implementation, the distance between any two groups of transmission lines in the overlapping part of the transmission lines corresponding to each photovoltaic array can be greater than or equal to the insulation distance, each The overlapping part of the transmission line corresponding to the photovoltaic array can be wrapped with an insulating material diaphragm or filled with insulating glue to realize the insulation treatment of the overlapping part of the transmission line corresponding to each photovoltaic array, which enriches the insulation treatment method of the transmission line in the photovoltaic power supply system , further improving the applicability of the photovoltaic power supply system.

In combination with the first aspect or any one of the first possible implementation manner of the first aspect to the fifth possible implementation manner of the first aspect, in the sixth possible implementation manner, the photovoltaic power supply system may further include a converter circuit, the output end of the confluence device is connected to the load through the converter circuit.

With reference to the sixth possible implementation manner of the first aspect, in a seventh possible implementation manner, the photovoltaic power supply system may further include a DC bus, and the output end of the busbar may be connected to the converter circuit through the DC bus.

With reference to the seventh possible implementation manner of the first aspect, in an eighth possible implementation manner, the photovoltaic power supply system may further include a transformer, and the converter circuit may be connected to a load through the transformer.

With reference to the eighth possible implementation manner of the first aspect, in a ninth possible implementation manner, the photovoltaic power supply system may further include a grid-connecting and off-grid wiring device, and the transformer may be connected to a load through the grid-connecting and off-grid wiring device.

In this application, the connection mode of the confluence device and the load in the photovoltaic power supply system is flexible, and the composition of the functional modules in the photovoltaic power supply system is diverse and flexible, which can improve the diversity of application scenarios of the photovoltaic power supply system and enhance the adaptability of the photovoltaic power supply system .

Description of drawings

Fig. 1 is a schematic diagram of the application scenario of the photovoltaic power supply system provided by the present application;

Fig. 2 is a structural schematic diagram of the photovoltaic power supply system provided by the present application;

Fig. 3 is a schematic diagram of a connection relationship between multiple photovoltaic arrays and confluence devices provided by the present application;

Fig. 4 is a schematic diagram of another connection relationship between a plurality of photovoltaic arrays and a confluence device provided by the present application;

Fig. 5 is another structural schematic diagram of the photovoltaic power supply system provided by the present application;

Fig. 6 is another structural schematic diagram of the photovoltaic power supply system provided by the present application;

Fig. 7 is another structural schematic diagram of the photovoltaic power supply system provided by the present application.

Detailed ways

Solar energy is an inexhaustible, inexhaustible, non-polluting green energy bestowed by nature. In other words, solar energy is a clean, renewable new energy that plays a wide role in people's lives and work , one of which is the conversion of solar energy into electricity. Solar power generation can be divided into photothermal power generation and photovoltaic power generation, and the power supply system provided in this application can be a power supply system based on solar photovoltaic power generation. Solar photovoltaic power generation has the characteristics of no moving parts, no noise, no pollution, and high reliability. It has excellent application prospects in communication power supply systems in remote areas. In the field of photovoltaic power supply, the photovoltaic power supply equipment (for example, photovoltaic array) in the photovoltaic power supply system can be integrated and installed in a fixed position (for example, the photovoltaic array is arranged in the glass of the building), so that the received Light energy or solar energy is converted into electrical energy to power the load. The photovoltaic power supply system provided in this application can be applied to photovoltaic power generation devices in building glass, bridge deck glass, pavement glass, or other buildings or facilities. The details can be determined according to the actual application scenario, and there is no limitation here.

Please refer to FIG. 1 , which is a schematic diagram of an application scenario of a photovoltaic power supply system provided in this application. As shown in FIG. 1 , the photovoltaic power supply system may include multiple photovoltaic arrays, multiple wiring devices and at least one confluence device. It can be understood that the photovoltaic array here can be arranged in building glass, bridge deck glass, road glass or other buildings or photovoltaic power generation devices. The photovoltaic power supply system provided by this application is suitable for supplying power to base station equipment in remote areas with no or poor mains power, or battery power, or household equipment (such as refrigerators, air conditioners, etc.) and other types of electrical equipment. The power supply can be determined according to the actual application scenario, and there is no limitation here. It can be further understood that the load in FIG. 1 may be a power grid, a storage battery, electrical equipment of a building, lighting equipment of a bridge, or other electrical equipment. For the convenience of description, the photovoltaic power supply system provided by the present application will be exemplarily described below by taking the photovoltaic array arranged on the glass of a building as an example to supply power to the power grid. The power grid here may include power consumption equipment or power transmission equipment such as transmission lines, power transfer sites, storage batteries, communication base stations, or household equipment.

In the photovoltaic power supply system shown in FIG. 1 , each photovoltaic array among multiple photovoltaic arrays can be connected in parallel to the input terminal of the confluence device through the wiring device connected to each photovoltaic array, and the output terminal of the confluence device can be connected to a load. Here, the current combining device can be used to transmit the output current of each photovoltaic array to the load through the wiring device connected to each photovoltaic array. Here, the photovoltaic array includes multiple photovoltaic power generation units (as shown in the gray box in the figure), and the photovoltaic power supply system can limit the number of photovoltaic power generation units in each photovoltaic array to ensure that in a photovoltaic array, if one In case of a short-circuit fault of a photovoltaic power generation unit, the fault operating current in the short-circuit faulty photovoltaic power generation unit (for example, the current converged by the output current of other unfailed photovoltaic power generation units into the short-circuited photovoltaic power generation unit) does not exceed the current of the short-circuited photovoltaic power generation unit The maximum operating current (that is, not exceeding the maximum operating current that the photovoltaic power generation unit can withstand). At the same time, each photovoltaic array in the photovoltaic array can be connected to the confluence device in parallel through the wiring device connected to each photovoltaic array, and the output current of each photovoltaic array is transmitted to the load through the wiring device and the confluence device. As a result, the abnormal operating current that the photovoltaic power generation unit bears when a short circuit occurs does not exceed the maximum operating current, which improves the safety of the photovoltaic power supply system and prolongs the service life of the photovoltaic power supply system. At the same time, a photovoltaic array can include as many The photovoltaic power generation unit, thereby increasing the photovoltaic power generation area of the photovoltaic power supply system, improving power supply efficiency, and reducing production costs.

The photovoltaic power supply system provided by the present application will be illustrated below with reference to FIG. 2 to FIG. 7 .

Referring to FIG. 2 , FIG. 2 is a schematic structural diagram of a photovoltaic power supply system provided by the present application. In the photovoltaic power supply system shown in Figure 2, the photovoltaic power supply system may include multiple photovoltaic arrays (for example, photovoltaic array a to photovoltaic array j), multiple wiring devices (for example, wiring device a to wiring device j) and at least A confluence device. Here, a plurality of photovoltaic power generation units included in one of the plurality of photovoltaic arrays can be connected in parallel to one of the plurality of wiring devices, and the number of photovoltaic power generation units included in each photovoltaic array of the plurality of photovoltaic arrays is less than or equal to the number of photovoltaic power generation units included in the photovoltaic array. The ratio of the maximum operating current of the generating unit to the rated operating current. Here, each photovoltaic array among the plurality of photovoltaic arrays can be connected in parallel to the input end of the current confluence device through the wiring device connected to each photovoltaic array, and the output end of the current confluence device can be connected to a load. Here, the current combining device can be used to transmit the output current of each photovoltaic array to the load through the wiring device connected to each photovoltaic array. Here, a photovoltaic array in the photovoltaic power supply system may include multiple photovoltaic power generation units. Here, the number of photovoltaic power generation units is less than or equal to the ratio of the maximum operating current of the photovoltaic power generation units to the rated operating current. It can be understood that if the maximum working current of a photovoltaic power generation unit is K times the rated working current, then a photovoltaic array can contain up to K photovoltaic power generation units, (here K is a natural number, when K is not an integer, then down Rounding). That is to say, the photovoltaic power supply system can limit the number of photovoltaic power generation units in each photovoltaic array, thereby ensuring that in a photovoltaic array, if a photovoltaic power generation unit short-circuits, the fault operating current in the short-circuit faulty photovoltaic power generation unit will (for example, the current that is converged into the short-circuited photovoltaic power generation unit by the output current of other non-faulty photovoltaic power generation units) does not exceed the maximum operating current of the photovoltaic power generation unit (that is, does not exceed the maximum operating current that the photovoltaic power generation unit can withstand current). At the same time, each photovoltaic array in the photovoltaic array can be connected to the confluence device in parallel through the wiring device connected to each photovoltaic array, and the output current of each photovoltaic array is transmitted to the load through the wiring device and the confluence device.

By adopting the implementation method provided by this application, the abnormal operating current that the photovoltaic power generation unit bears when a short circuit occurs does not exceed the maximum operating current, which improves the safety of the photovoltaic power supply system and prolongs the service life of the photovoltaic power supply system. At the same time, it can also make a photovoltaic array As many photovoltaic power generation units as possible can be included, thereby increasing the photovoltaic power generation area of the photovoltaic power supply system, improving power supply efficiency, and reducing production costs.

In some feasible implementation manners, the confluence device may include multiple anti-backflow modules. Please refer to FIG. 3 for details. FIG. 3 is a schematic diagram of a connection relationship between multiple photovoltaic arrays and confluence devices provided by the present application. As shown in part (a) of FIG. 3, multiple photovoltaic arrays (for example, photovoltaic array a One of the multiple wiring devices (for example, wiring device a and wiring device b) corresponding to the photovoltaic array b) can be connected to the confluence device through one of the multiple anti-backflow modules. Here, the positive pole of each wiring device among the plurality of wiring devices can be connected to the positive input end of the confluence device through each of the multiple anti-influx modules, and the negative pole of each wiring device can be connected to the negative input end of the confluence device. Here, the current confluence device can be used to prevent other non-short-circuited photovoltaic arrays from outputting current to any short-circuited photovoltaic array through each anti-backflow module when any photovoltaic array is short-circuited. It can be understood that when a photovoltaic power generation unit in a photovoltaic array is short-circuited, the equivalent resistance of the faulty photovoltaic array will become smaller. Flowing to the load, but backflowing into the failed photovoltaic array, not only hinders the photovoltaic power supply system from supplying energy to the load, but also endangers the safety of components in the photovoltaic system (for example, photovoltaic power generation units in the failed photovoltaic array). Here, the anti-backflow module can be a diode, a metal oxide semiconductor field effect transistor MOSFET, a gallium nitride transistor GaNHEMT or an insulated gate bipolar transistor IGBT, which enriches the component selection and application scenarios of the photovoltaic power supply system. Using the implementation method provided by this application, when any photovoltaic array is short-circuited, the current confluence device can prevent other non-short-circuited photovoltaic arrays from outputting current to any short-circuited photovoltaic array through each anti-backflow module, thereby improving the safety of the photovoltaic power supply system , while prolonging the service life of the photovoltaic power supply system, it ensures that the output current of each photovoltaic array is normally transmitted to the load, which improves the stability and work efficiency of the photovoltaic power supply system.

Please continue to refer to part (a) in Figure 3. It can be understood that the photovoltaic power supply system can also include multiple sets of transmission lines, and one photovoltaic array in multiple sets of transmission lines can be connected to multiple wiring devices through one set of transmission lines in multiple sets of transmission lines. a wiring device. Here, the photovoltaic arrays of the photovoltaic power supply system can be symmetrically arranged in the photovoltaic power supply system to form a photovoltaic array group, and the wiring devices corresponding to each photovoltaic array can be arranged symmetrically at each side edge of the photovoltaic array group. overlap. Here, the symmetrical arrangement of the photovoltaic arrays in the photovoltaic power supply system in the photovoltaic power supply system may include axisymmetric arrangement, central symmetrical arrangement or other arrangements in which the transmission lines corresponding to the photovoltaic arrays do not overlap. As shown in part (a) of Figure 3, when a photovoltaic array group includes two photovoltaic arrays (that is, photovoltaic array a and photovoltaic array b), the two photovoltaic arrays can be arranged laterally symmetrically, correspondingly, the two photovoltaic arrays The wiring devices corresponding to each photovoltaic array (that is, wiring device a and wiring device b) can be arranged symmetrically at the left and right edges of the photovoltaic array group (or the wiring devices corresponding to two photovoltaic arrays can be symmetrically arranged on the photovoltaic array at the same time) The upper or lower edge of the array group, not shown in the figure), so that the transmission lines corresponding to each photovoltaic array do not overlap. Or as shown in part (b) of Figure 3, when a photovoltaic array group includes two photovoltaic arrays (that is, photovoltaic array a and photovoltaic array b), the two photovoltaic arrays can be longitudinally symmetrically arranged, correspondingly, The wiring devices corresponding to the two photovoltaic arrays (that is, the wiring device a and the wiring device b) can be symmetrically arranged at the upper and lower edges of the photovoltaic array group (or the corresponding wiring devices of the two photovoltaic arrays can be symmetrically arranged at the same time) left or right edge of the photovoltaic array group, not shown in the figure), so that the transmission lines corresponding to each photovoltaic array do not overlap.

It can be further understood that when a photovoltaic array group includes more than two photovoltaic arrays, each photovoltaic array can be extended and arranged according to the symmetrical arrangement of two photovoltaic arrays when a photovoltaic array group includes two photovoltaic arrays, or can be arranged according to the central symmetry At the same time, the wiring devices corresponding to each photovoltaic array can be symmetrically arranged at each side edge of the photovoltaic array group, so that the transmission lines corresponding to each photovoltaic array do not overlap. In addition, the confluence device provided in the present application can be an integrated confluence device that uniformly concatenates each photovoltaic array through the wiring device of each photovoltaic array, or can concatenate each photovoltaic array in a partitioned or graded manner through the wiring device of each photovoltaic array. Distributed confluence device.

It can be further understood that the arrangement of photovoltaic arrays and wiring devices listed in this application is only a part of the feasible arrangement, and other arrangement of transmission lines corresponding to each photovoltaic array without overlapping also falls within the protection scope of this application. In the scenario where the photovoltaic arrays arranged on the glass of a building supply power to the power grid, this connection arrangement can be applied to the situation where there are multiple wiring interfaces on the edge of the glass. The arrangement of each photovoltaic array is very flexible and can be based on the glass Shape layout, thereby increasing the photovoltaic power generation area of the photovoltaic power supply system, improving power supply efficiency, and reducing production costs. That is to say, using the implementation method provided by this application, the wiring devices corresponding to each photovoltaic array can be symmetrically arranged at each side edge of the photovoltaic array group. On the basis of ensuring that the transmission lines corresponding to each photovoltaic array do not overlap, the arrangement method It is flexible and diverse, and can adapt to different application scenarios, improving the applicability of the photovoltaic power supply system.

In some feasible implementations, the wiring devices corresponding to each photovoltaic array can be arranged in a centralized manner. Please refer to Figure 4 for details. As shown in part (a) of 4, the photovoltaic arrays of the photovoltaic power supply system can be arranged side by side in the photovoltaic power supply system to form a photovoltaic array group, and the wiring devices corresponding to at least two photovoltaic arrays in the photovoltaic array group can be arranged on the photovoltaic array At the edge of the same side of the group, the overlapping parts of the transmission lines corresponding to each photovoltaic array can be insulated. Here, the parallel arrangement of the photovoltaic arrays in the photovoltaic power supply system in the photovoltaic power supply system may include horizontal parallel arrangement, vertical parallel arrangement, or other arrangements in which transmission lines corresponding to the photovoltaic arrays overlap. Here, the wiring devices corresponding to each photovoltaic array can be collectively arranged at the edge of the same side of the photovoltaic array group, or separately arranged at multiple side edges of the photovoltaic array group.

As shown in part (a) of Figure 4, when a photovoltaic array group includes two photovoltaic arrays (that is, photovoltaic array a and photovoltaic array b), the two photovoltaic arrays can be arranged side by side laterally, and correspondingly, the two photovoltaic arrays The wiring devices corresponding to each photovoltaic array (that is, the wiring device a and the wiring device b) can be uniformly arranged on the left side (not shown in the figure) or the right edge of the photovoltaic array group, and the transmission lines corresponding to each photovoltaic array The overlapping parts can be insulated. Or as shown in part (b) of Figure 4, when a photovoltaic array group includes two photovoltaic arrays (that is, photovoltaic array a and photovoltaic array b), the two photovoltaic arrays can be arranged side by side vertically, correspondingly, The wiring devices corresponding to the two photovoltaic arrays (that is, the wiring device a and the wiring device b) can be concentrated on the upper or lower side (not shown in the figure) edge of the photovoltaic array group, and the transmission lines corresponding to each photovoltaic array The overlapping parts can be insulated.

It can be further understood that when a photovoltaic array group includes more than two photovoltaic arrays, each photovoltaic array can be extended according to the horizontal or vertical arrangement when a photovoltaic array group includes two photovoltaic arrays, or can be arranged according to the horizontal N PV arrays * M PV arrays are arranged side by side in the vertical direction (here N and M are integers), and at the same time, the wiring devices corresponding to each PV array can be centrally arranged on the same side edge of the PV array group, or separately centralized Arranged at the edges of multiple sides of the photovoltaic array group, the overlapping parts of the transmission lines corresponding to each photovoltaic array can be insulated. In addition, the confluence device provided in the present application can be an integrated confluence device that uniformly concatenates each photovoltaic array through the wiring device of each photovoltaic array, or can concatenate each photovoltaic array in a partitioned or graded manner through the wiring device of each photovoltaic array. Distributed confluence device.

It can be further understood that the arrangement of photovoltaic arrays and wiring devices listed in this application is only a part of the feasible arrangement, and the arrangement of other wiring devices corresponding to each photovoltaic array is also within the protection scope of this application. In the scene where the photovoltaic arrays arranged on the glass of the building supply power to the power grid, this connection arrangement can be applied to the situation where there is one or a small number of wiring interfaces on the edge of the glass. The arrangement of each photovoltaic array is very flexible and can The shape of the layout can increase the photovoltaic power generation area of the photovoltaic power supply system, improve power supply efficiency, and reduce production costs. Optionally, in the overlapping part of the transmission lines corresponding to each photovoltaic array, the distance between any two sets of transmission lines can be greater than or equal to the insulation distance, and the overlapping part of the transmission lines corresponding to each photovoltaic array can be wrapped with an insulating material diaphragm Or fill in insulating glue to realize the insulation treatment of the overlapping parts of the transmission lines corresponding to each photovoltaic array, which enriches the insulation treatment methods of the transmission lines in the photovoltaic power supply system and further improves the applicability of the photovoltaic power supply system. That is to say, using the implementation method provided by this application, the wiring devices corresponding to each photovoltaic array can be collectively arranged at the same side edge of the photovoltaic array group or separately concentrated at multiple side edges of the photovoltaic array group. At the same time, for each The overlapping parts of the transmission lines corresponding to the photovoltaic arrays can be insulated. While ensuring the safe insulation between the transmission lines corresponding to each photovoltaic array, the arrangement is flexible and diverse, which can adapt to different application scenarios and improve the application of photovoltaic power supply systems. sex.

Please refer to FIG. 5 . FIG. 5 is another structural schematic diagram of the photovoltaic power supply system provided by the present application. The photovoltaic power supply system shown in FIG. 5 may also include a converter circuit, and the output terminal of the bus confluence device may be connected to a load through the converter circuit. Here, the current conversion circuit can convert the output current of the photovoltaic array into a current that matches the load through the current confluence device, and transmit the current to the load. Optionally, in some feasible implementation manners, as shown in FIG. 5 , the photovoltaic power supply system may further include a DC bus, and the output end of the busbar may be connected to a load through the DC bus and the converter circuit. Here, a bus capacitor or a plurality of bus capacitors connected in series may be included on the DC bus, which may be used for energy storage. For example, as shown in FIG. 5 , a bus capacitor C is included on the DC bus. In the photovoltaic power supply system shown in FIG. 5 , the converter circuit can convert the electric energy output by the power generation device and stored at both ends of the bus capacitor C, and output corresponding current and voltage to maintain the load (for example, the power grid) to work. It can be understood that multiple photovoltaic arrays in the photovoltaic power supply system can be connected in parallel to the confluence device through the wiring device, and then directly connected to the converter circuit through the confluence device, or can be connected to the DC bus through the confluence device and connected to the converter circuit through the DC bus. It is set according to the actual application scenario, and there is no limitation here.

Referring to FIG. 6 , FIG. 6 is another structural schematic diagram of the photovoltaic power supply system provided by the present application. In the photovoltaic power supply system shown in Figure 6, the photovoltaic array can be connected to the DC bus through the wiring device and the confluence device, and connected to the converter circuit through the DC bus, and the converter circuit is connected to the load through the transformer. In other words, the output current of multiple photovoltaic arrays in the power generation device can be combined through the wiring device and the bus connection device (that is, multiple photovoltaic arrays are connected in parallel to the bus connection device through the wiring device) to provide input voltage (or input current) for the converter circuit. . The converter circuit can convert the electrical energy output from the photovoltaic array and stored at both ends of the bus capacitor C (for example, convert DC electrical energy into AC electrical energy and initially boost the voltage), and then output corresponding current and voltage to the transformer. The transformer can further boost the voltage and transmit it to the load (for example, the power grid) to maintain the load (for example, the power grid) working.

Referring to Fig. 7, Fig. 7 is another structural schematic diagram of the photovoltaic power supply system provided by the present application. As shown in Figure 7, the photovoltaic power supply system can also include a grid-connected and off-grid wiring device, and the converter circuit can be connected to the transmission line in the load (for example, power grid), power transfer site, storage battery, communication base station or household Equipment and other electrical equipment or power transmission equipment for power supply.

In this application, the connection mode of the confluence device and the load in the photovoltaic power supply system is flexible, and the composition of the functional modules in the photovoltaic power supply system is diverse and flexible, which can improve the diversity of application scenarios of the photovoltaic power supply system and enhance the adaptability of the photovoltaic power supply system . At the same time, in any of the photovoltaic power supply systems shown in Figures 1 to 7 above, the photovoltaic power supply system can make the abnormal operating current of the photovoltaic power generation unit not exceed the maximum operating current when a short circuit occurs, improving the safety of the photovoltaic power supply system , prolong the service life of the photovoltaic power supply system, and at the same time enable a photovoltaic array to include as many photovoltaic power generation units as possible, thereby increasing the photovoltaic power generation area of the photovoltaic power supply system, improving power supply efficiency, and reducing production costs.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. Should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims

A photovoltaic power supply system, characterized in that the photovoltaic power supply system includes a plurality of photovoltaic arrays, a plurality of wiring devices and at least one confluence device, and a plurality of photovoltaic power generation units included in a photovoltaic array in the plurality of photovoltaic arrays are connected in parallel To one of the multiple wiring devices, the number of photovoltaic power generation units included in each of the multiple photovoltaic arrays is less than or equal to the ratio of the maximum operating current to the rated operating current of the photovoltaic power generating units;

Each photovoltaic array in the plurality of photovoltaic arrays is connected in parallel to the input end of the confluence device through the wiring device connected to each photovoltaic array, and the output end of the confluence device is connected to a load;

The current converging device is used to transmit the output current of each photovoltaic array to the load through the wiring device connected to each photovoltaic array.
The photovoltaic power supply system according to claim 1, wherein the confluence device comprises a plurality of anti-inverting modules, one of the plurality of wiring devices passes through one of the plurality of anti-inverting modules connecting the confluence device;

The positive pole of each wiring device in the plurality of wiring devices is connected to the positive input end of the confluence device through each anti-inflow module in the plurality of anti-inflow modules, and the negative pole of each wiring device is connected to the negative pole of the confluence device input terminal;

The current confluence device is used to prevent other non-short-circuited photovoltaic arrays from outputting current to any short-circuited photovoltaic array through the anti-backflow modules when any photovoltaic array is short-circuited.
The photovoltaic power supply system according to claim 2, wherein the anti-backflow module is a diode, a metal oxide semiconductor field effect transistor MOSFET, a gallium nitride transistor GaNHEMT or an insulated gate bipolar transistor IGBT.
The photovoltaic power supply system according to any one of claims 1-3, wherein the photovoltaic power supply system further includes multiple sets of transmission lines, and one of the multiple photovoltaic arrays passes through the multiple sets of transmission lines. a set of transmission lines connecting one of the plurality of wiring devices;

The photovoltaic arrays of the photovoltaic power supply system are symmetrically arranged in the photovoltaic power supply system to form a photovoltaic array group, and the wiring devices corresponding to the photovoltaic arrays are arranged symmetrically at each side edge of the photovoltaic array group. The transmission lines corresponding to the photovoltaic array do not overlap.
The photovoltaic power supply system according to any one of claims 1-3, wherein the photovoltaic power supply system further includes multiple sets of transmission lines, and one of the multiple photovoltaic arrays passes through the multiple sets of transmission lines. a set of transmission lines connecting one of the plurality of wiring devices;

The photovoltaic arrays of the photovoltaic power supply system are arranged side by side in the photovoltaic power supply system to form a photovoltaic array group, and the wiring devices corresponding to at least two photovoltaic arrays in the photovoltaic array group are arranged on the same side of the photovoltaic array group At the edge, the overlapping parts of the transmission lines corresponding to the photovoltaic arrays are insulated.
The photovoltaic power supply system according to claim 5, characterized in that, the distance between any two groups of transmission lines in the overlapped part of the transmission lines corresponding to each photovoltaic array is greater than or equal to the insulation distance, and the distance between the transmission lines corresponding to each photovoltaic array The overlapping part of the transmission line is wrapped with an insulating material diaphragm or filled with insulating glue, so as to realize the insulation treatment for the overlapping part of the transmission line corresponding to each photovoltaic array.
The photovoltaic power supply system according to any one of claims 1-6, characterized in that the photovoltaic power supply system further comprises a converter circuit, and the output terminal of the confluence device is connected to the load through the converter circuit.
The photovoltaic power supply system according to claim 7, wherein the photovoltaic power supply system further comprises a DC bus, and the output end of the confluence device is connected to the converter circuit through the DC bus.
The photovoltaic power supply system according to claim 8, characterized in that the photovoltaic power supply system further comprises a transformer, and the converter circuit is connected to the load through the transformer.
The photovoltaic power supply system according to claim 9, characterized in that the photovoltaic power supply system further comprises a grid-connected and off-grid wiring device, and the transformer is connected to the load through the grid-connected and off-grid wiring device.