CN104320072A - Power generation unit and photovoltaic power station - Google Patents

Abstract

The embodiment of the present invention discloses a power generation unit including: a photovoltaic power generation array and an inverter device, wherein the multiple photovoltaic sub-arrays include at least two rows of photovoltaic sub-arrays, and each row of photovoltaic sub-arrays includes a first row of photovoltaic modules and the second row of photovoltaic modules; the inverter device includes: a string inverter corresponding to each row of photovoltaic modules and electrically connected to each row of photovoltaic modules. It can be seen that in the power generation unit provided by the embodiment of the present invention, the photovoltaic modules in different rows have their corresponding string inverters, so that the power generation unit provided by the embodiment of the present invention can realize the power generation of different rows The photovoltaic modules perform different MPPT tracking to avoid the problem that a certain row of photovoltaic sub-arrays in each row of photovoltaic sub-arrays is blocked from light, so that the power of the entire power generation unit is affected by shadows, and the power generation efficiency of the power generation unit is improved. .

Description

Power generation unit and photovoltaic power station

technical field

The invention relates to the technical field of photovoltaic power generation, in particular to a power generation unit and a photovoltaic power station.

Background technique

Due to the clean and pollution-free advantages of solar power generation, the installed capacity of domestic photovoltaic power plants has grown rapidly year by year in recent years. At present, photovoltaic power stations can be divided into large-scale photovoltaic power stations on the ground and distributed photovoltaic power stations on the roof. Among them, the ground photovoltaic power station covers a large area and has a large installed capacity. It generally adopts a technical solution of decentralized power generation, centralized control, and single-point grid connection. Usually, a large-scale photovoltaic power station on the ground is composed of several power generation units, and the installed capacity of each power generation unit is about 1MW.

As shown in FIG. 1 , the power generation unit in the prior art includes: a photovoltaic array area 101 , a DC confluence area 102 , an inverter boost area 103 , a road area 104 in the field area, and an area 105 for the distance between rows before and after the array. Wherein, the photovoltaic array area 101 includes 102 photovoltaic sub-arrays 106 with the same structure, arranged in 13 rows, and each photovoltaic sub-array 106 is generally composed of 36 photovoltaic modules of 300W (or 295W, 305W, 310W, etc.) , the 36 photovoltaic modules are divided into upper and lower rows of 18 head-to-head arrangements. It should be noted that the number of photovoltaic modules in each photovoltaic sub-array can be adjusted according to local temperature conditions; The middle part of the field area; the photovoltaic combiner box of the DC confluence area 102 is installed on the photovoltaic support on both sides of the road area 104 of the field area; the inverter boost area 103 is located in the center of the power generation unit, Including two 500kW centralized inverters and one 1100kVA step-up transformer. Its working principle is: the photovoltaic sub-array 106 of the photovoltaic array area 101 is connected to the centralized inverter in the inverter boost area 103 after passing through the photovoltaic combiner box of the DC confluence area 102. After the DC power is converted into AC power by the converter, the voltage is boosted by the step-up transformer. However, the power generation efficiency of the above-mentioned power generation unit needs to be improved.

Contents of the invention

In order to solve the above technical problems, an embodiment of the present invention provides a power generation unit and a photovoltaic power station, so as to improve the power generation efficiency of the power generation unit.

In order to solve the above problems, the embodiments of the present invention provide the following technical solutions:

A power generating unit comprising:

A photovoltaic power generation array, the photovoltaic power generation array comprising a plurality of photovoltaic sub-arrays, the plurality of photovoltaic sub-arrays comprising at least two rows of photovoltaic sub-arrays, each row of photovoltaic sub-arrays comprising a first row of photovoltaic components and a second row of photovoltaic components;

An inverter device, the inverter device includes: a string inverter corresponding to each row of photovoltaic modules and electrically connected to each row of photovoltaic modules.

Preferably, it also includes: a current converging device electrically connected to each string inverter.

Preferably, it further includes: a step-up transformer electrically connected to the current-combining device.

Preferably, each row of photovoltaic sub-arrays includes: a first column of photovoltaic sub-arrays and a second column of photovoltaic sub-arrays that are oppositely arranged.

Preferably, the photovoltaic power generation array includes 129 photovoltaic sub-arrays, and the 129 photovoltaic sub-arrays are divided into 13 rows of photovoltaic sub-arrays, wherein one row of photovoltaic sub-arrays includes 9 photovoltaic sub-arrays, and each of the remaining 12 rows of photovoltaic sub-arrays The row of photovoltaic sub-arrays includes 10 photovoltaic sub-arrays; the inverter device includes 52 string inverters.

Preferably, the junction device includes 8 AC junction boxes.

Preferably, each AC junction box is electrically connected to 6 string inverters

Preferably, each group of string inverters is electrically connected to the step-up transformer through connecting cables.

Preferably, each row of photovoltaic modules is electrically connected to its corresponding string inverter through a DC cable.

A photovoltaic power station comprising the power generation unit described in any one of the above.

Compared with the prior art, the above-mentioned technical solution has the following advantages:

The power generation unit provided by the embodiment of the present invention includes: a photovoltaic power generation array and an inverter device, wherein the multiple photovoltaic sub-arrays include at least two rows of photovoltaic sub-arrays, and each row of photovoltaic sub-arrays includes a first row of photovoltaic modules and The second row of photovoltaic components; the inverter device includes: a string inverter corresponding to each row of photovoltaic components and electrically connected to each row of photovoltaic components. It can be seen that in the power generation unit provided by the embodiment of the present invention, the photovoltaic modules in different rows have their corresponding string inverters, so that the power generation unit provided by the embodiment of the present invention can realize the power generation of different rows The photovoltaic modules perform different MPPT tracking to avoid the problem that a certain row of photovoltaic sub-arrays in each row of photovoltaic sub-arrays is blocked from light, so that the power of the entire power generation unit is affected by shadows, and the power generation efficiency of the power generation unit is improved. .

Moreover, in the power generation unit provided by the embodiment of the present invention, different rows of photovoltaic sub-arrays are electrically connected to different string inverters, so that when a certain string inverter fails, only the inverters connected to the string inverter will be affected. The photovoltaic sub-array electrically connected to the faulty string inverter will not affect other photovoltaic sub-arrays, and the impact range is relatively small.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are For some embodiments of the present invention, those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a schematic structural diagram of a power generation unit in the prior art;

Fig. 2 is a schematic structural diagram of a power generating unit provided in an embodiment of the present invention;

Fig. 3 is a schematic structural diagram of a photovoltaic sub-array provided in one embodiment of the present invention;

Fig. 4 is a schematic diagram of the power generation unit provided in one embodiment of the present invention divided into 10 confluence sub-units;

FIG. 5 is a schematic structural diagram of the confluence subunit 301 after being divided into 10 confluence subunits in FIG. 4;

FIG. 6 is a schematic structural diagram of the confluence subunit 305 after being divided into 10 confluence subunits in FIG. 4;

FIG. 7 is a schematic structural diagram of the confluence subunit 309 after being divided into 10 confluence subunits in FIG. 4 ;

FIG. 8 is a schematic structural diagram of the confluence subunit 310 after being divided into 10 confluence subunits in FIG. 4 ;

Fig. 9 is a schematic diagram of the electrical connection between the string inverter, the AC junction box and the step-up transformer in the power generation unit provided by one embodiment of the present invention;

Fig. 10 is a schematic diagram of the electrical connection between each photovoltaic module and its corresponding string inverter in the same confluence subunit and the same row of photovoltaic subarrays in the power generation unit provided by one embodiment of the present invention.

Detailed ways

As mentioned in the background art section, the power generation efficiency of the power generation unit in the prior art needs to be improved.

The inventor found that according to the design specifications of photovoltaic power plants, the distance between the front and rear photovoltaic arrays in each power generation unit can only ensure that the light is not blocked from 9:00 am to 3:00 pm on the winter solstice day (that is, the upper row of photovoltaic modules and the lower row of photovoltaic modules are not blocked. light), except for this time period, the photovoltaic modules in the lower row will block light. However, each centralized inverter has only 3 channels of MPPT (Maximum Power Point Tracking, maximum power point tracking), that is, each power generation unit in the prior art includes 6 channels of MPPT to track the power of 102 photovoltaic sub-arrays. Moreover, in the prior art, when the six MPPTs are connected between the photovoltaic sub-arrays and the centralized inverter, the MPPTs are not strictly distinguished, so that when the photovoltaic modules in the lower row are blocked from light, the entire power generation The electric quantity of the unit is all affected by the shadow, causing the power generation efficiency of the power generation unit to be low.

Moreover, for the hillside photovoltaic power station, the ground where it is built is uneven, so that the orientation of each row of photovoltaic sub-arrays in each power generation unit may be different, and the amount of solar radiation received by photovoltaic sub-arrays with different orientations is different. Due to the limitation of the number of MPPTs in the inverter and the connection mode, each MPPT of the centralized inverter in the prior art power generation unit cannot distinguish each row of photovoltaic sub-arrays with different orientations, thus affecting the overall power generation efficiency of each power generation unit.

In addition, since the power generation unit in the prior art only includes two centralized inverters, when a centralized inverter fails, all rows of photovoltaic sub-arrays connected to the centralized inverter will be affected , the capacity is about 0.5MW, and the influence range is relatively large.

In view of this, an embodiment of the present invention provides a power generation unit, including:

A photovoltaic power generation array, the photovoltaic power generation array comprising a plurality of photovoltaic sub-arrays, the plurality of photovoltaic sub-arrays comprising at least two rows of photovoltaic sub-arrays, each row of photovoltaic sub-arrays comprising a first row of photovoltaic components and a second row of photovoltaic components;

An inverter device, the inverter device includes: a string inverter corresponding to each row of photovoltaic modules and electrically connected to each row of photovoltaic modules.

In the power generation unit provided by the embodiment of the present invention, photovoltaic modules in different rows have their corresponding string inverters, so that the power generation unit provided by the embodiment of the present invention can implement different The MPPT tracking of the road avoids the problem that one row of photovoltaic sub-arrays in each row of photovoltaic sub-arrays is blocked by light, and the power of the entire power generation unit is affected by shadows, thereby improving the power generation efficiency of the power generation unit.

For a hillside photovoltaic power station, although the orientations of the rows of photovoltaic sub-arrays in the power generation unit are different, in the power generation unit provided by the embodiment of the present invention, each row of photovoltaic sub-arrays corresponds to a different string inverter, To distinguish the rows of photovoltaic sub-arrays with different orientations, thus solving the problem that the MPPTs of the centralized inverter in the prior art cannot distinguish the rows of photovoltaic sub-arrays with different orientations, thus affecting the overall power generation efficiency of each power generation unit The problem.

Moreover, in the power generation unit provided by the embodiment of the present invention, different rows of photovoltaic sub-arrays are electrically connected to different string inverters, so that when a certain string inverter fails, only the inverters connected to the string inverter will be affected. The photovoltaic sub-array electrically connected to the faulty string inverter will not affect other photovoltaic sub-arrays, and the impact range is relatively small.

In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings.

In the following description, specific details are set forth in order to provide a thorough understanding of the present invention. However, the present invention can be implemented in many other ways than those described here, and those skilled in the art can make similar extensions without departing from the connotation of the present invention. Accordingly, the invention is not limited to the specific implementations disclosed below.

An embodiment of the present invention provides a power generation unit, including: a photovoltaic power generation array, the photovoltaic power generation array includes a plurality of photovoltaic sub-arrays, the plurality of photovoltaic sub-arrays includes at least two rows of photovoltaic sub-arrays, each row of photovoltaic sub-arrays Including the first row of photovoltaic modules and the second row of photovoltaic modules; an inverter device, the inverter device includes: a string inverter corresponding to each row of photovoltaic modules and electrically connected to each row of photovoltaic modules The string inverter is used to convert the output current of each row of photovoltaic modules electrically connected to it from direct current to alternating current for output.

It should be noted that when the number of photovoltaic sub-arrays included in the power generation unit is large, if the output current of each string inverter is directly transmitted to the grid, it will cause a gap between each string inverter and the grid. Excessive pressure drop. Therefore, when the number of photovoltaic sub-arrays included in the power generation unit is large, in a preferred embodiment of the present invention, the power generation unit further includes: a confluence device electrically connected to each string inverter, for The AC current output by the string inverter is combined and then output.

It should also be noted that for large-scale power stations, since large-scale power stations require the output voltage of the power generation unit to be relatively high, such as 35kV or 110kV, when the power generation unit provided by the embodiment of the present invention is used for large-scale power generation in the west When the station is installed, the power generation unit also includes: a step-up transformer electrically connected to the junction device, so as to convert the output current of the junction device into high-voltage current, so as to meet the requirements of large-scale power stations for the output voltage of the power generation unit . Preferably, the step-up transformer is a box-type transformer. In a specific embodiment of the present invention, the box-type transformer is a 1400kVA box-type transformer. More preferably, the voltage level of the box-type transformer can be 35kV, 10kV, or other voltage values, which the present invention does not There is no limit, depending on the grid-connected voltage.

In another embodiment of the present invention, the power generation unit may only include: a photovoltaic power generation array, an inverter device, and a step-up transformer, excluding a confluence device, wherein the inverter device is directly connected to the step-up transformer The current output by the inverter device is boosted and output, but there are many connection lines between the inverter device and the step-up transformer. When the power generation unit includes a current confluence device, the current confluence device will reverse After the output currents of each group of string inverters in the inverter device are converged, they are output to the step-up transformer, which can significantly reduce the number of connection lines between the inverter device and the step-up transformer, but the present invention does not do this Limited, as the case may be.

On the basis of any of the above-mentioned embodiments, in one embodiment of the present invention, each row of photovoltaic sub-arrays may include: a first column of photovoltaic sub-arrays and a second column of photovoltaic sub-arrays that are arranged oppositely, and are located on both sides of the road; In another embodiment of the present invention, each row of photovoltaic sub-arrays may also include only one row of photovoltaic sub-arrays, which are only arranged on the side of the road, which is not limited in the present invention, depending on the terrain.

As shown in Figure 2, on the basis of any of the above-mentioned embodiments, in a specific embodiment of the present invention, the power generation capacity of the power generation unit is about 1.4MW, and the photovoltaic power generation array includes 129 photovoltaic sub-arrays, The 129 photovoltaic sub-arrays are divided into 13 rows of photovoltaic sub-arrays, wherein 1 row of photovoltaic sub-arrays includes 9 photovoltaic sub-arrays, and each row of photovoltaic sub-arrays in the 12 rows of photovoltaic sub-arrays includes 10 photovoltaic sub-arrays; The inverter device includes 52 string inverters.

The power generation unit provided by the embodiment of the present invention will be described in detail below in conjunction with the power generation unit shown in FIG. 2 . But the present invention is not limited to this. In other embodiments of the present invention, the power generation unit can also include other numbers of photovoltaic sub-arrays and photovoltaic sub-arrays of other numbers (such as the capacity of the power generation unit is 1.3 MW, including a total of 119 photovoltaic sub-arrays, 12 rows of photovoltaic sub-arrays and other values), depending on the power generation capacity of the power generation unit.

As shown in Figure 2, in the embodiment of the present invention, the power generation unit includes: a photovoltaic power generation array area 201, an inverter confluence area 202, a step-up and transformation area 203, a field road area 204, and front and rear rows of photovoltaic array spacing areas 205. Wherein, the photovoltaic power generation array area 201 includes 129 photovoltaic sub-arrays 206 arranged in 13 rows, wherein one row of photovoltaic sub-arrays includes 9 photovoltaic sub-arrays, and each row of photovoltaic sub-arrays in the remaining 12 rows of photovoltaic sub-arrays includes 10 photovoltaic subarrays. Each row of photovoltaic sub-arrays is divided into a first column of photovoltaic sub-arrays and a second column of photovoltaic sub-arrays, which are respectively arranged on both sides of the road area 204 in the field. Preferably, the left-to-right distance between adjacent photovoltaic sub-arrays 106 in the same row ranges from 0.2m to 1m; The PV sub-arrays will not cast shadows on the rear row of PV sub-arrays.

Specifically, as shown in FIG. 3 , in one embodiment of the present invention, each photovoltaic sub-array 206 includes 36 photovoltaic modules P1-P36, which are arranged head-to-head in two rows above and below, wherein the photovoltaic modules P1-PV The side with the junction box in the module P18 (that is, the first row of photovoltaic modules) is installed downward, and the side with the junction box in the photovoltaic module P19-PV module (that is, the second row of photovoltaic modules) is installed upward. In the embodiment of the present invention, the positive and negative poles of the first row of photovoltaic modules are electrically connected in turn to form a string, and are electrically connected to the first group of string inverters, and the positive and negative poles of the second row of photovoltaic modules are sequentially electrically connected. The connection forms a string and is electrically connected to the second string inverter to ensure different MPPT tracking for the upper and lower rows of photovoltaic modules.

Preferably, the spacing range between left and right adjacent photovoltaic components in each row of photovoltaic components is preferably 20mm-40mm; It is preferably 20mm-40mm, which is not limited in the present invention, and depends on the specific circumstances. The power of the photovoltaic module can be 300W, 295W, 305W or other values, which is not limited in the present invention, depending on the specific situation.

On the basis of the above embodiments, in a specific embodiment of the present invention, the confluence device includes 8 AC confluence boxes, which are arranged on both sides of the road area 204 in the field area. In one embodiment of this embodiment, the 8 sets of AC combiner boxes include 6 sets of 6-connection 1 AC combiner boxes, and 2 sets of 8-connection 1 AC combiner boxes. In other embodiments of this embodiment, the 8 sets The AC combiner box includes 8 AC combiner boxes with 6 sinks and 1 AC combiner box. In other embodiments of this embodiment, the 8 AC combiner boxes can also be other types of AC combiner boxes. This is not limited in the present invention, as long as It is sufficient to ensure that it can confluence the currents of each string inverter.

As shown in FIG. 4 , in this embodiment, the 8 sets of AC combiner boxes include 8 sets of 6 sets of 1 AC combiner boxes, which are distributed on both sides of the road area 204 in the field and installed on photovoltaic supports. Among them, each AC junction box is electrically connected to 6 string inverters, corresponding to 12 rows of photovoltaic arrays with 10 photovoltaic sub-arrays in each of the 13 rows of photovoltaic sub-arrays, and the remaining 1 row of photovoltaic arrays with 9 photovoltaic sub-arrays The sub-array is not electrically connected to the AC junction box, but is directly electrically connected to the step-up transformer.

As shown in Figure 4, in a specific embodiment of the present invention, the power generation unit is divided into 10 confluence subunits, namely confluence subunits 301-310, wherein the confluence subunits 301-301 have the same structure 4 subunits, the confluence subunits 305-308 will be 4 subunits of the same structural form. The following takes the flow subunit 301 as an example to describe the flow subunits 301-304 in detail, and takes the flow subunit 305 as an example to describe the flow subunits 305-308 in detail. The flow subunit 309 and the flow subunit 310 Separately elaborated.

As shown in Figure 5, the confluence sub-unit 301 includes three rows of 15 photovoltaic sub-arrays A1-1-A1-15, six 28kW string inverters N1-1 to N1-6, and one AC confluence box H1. Among them, 6 sets of string inverters N1-1 to N1-6 are arranged on the right side of each confluence sub-unit (that is, the side close to the road area 204 of the site) in the form of two sets in each row, and are installed at the most On the bracket of the photovoltaic sub-array on the right; 1 AC combiner box is located on the right side of the middle row of photovoltaic sub-arrays, and is installed side by side with string inverter N1-3 and string inverter N1-4 on the far right On the support of the side photovoltaic sub-array, and located on the right side of the string inverter N1-4, the output currents of the six string inverters N1-1 to N1-6 are combined.

As shown in Figure 6, the confluence sub-unit 305 includes three rows of 15 photovoltaic sub-arrays A5-1-A5-15, six 28kW string inverters N5-1 to N5-6, and one AC confluence box H5. Among them, 6 sets of string inverters N5-1 to N5-6 are arranged on the left side of the confluence subunit (that is, the side close to the road area 204 of the site) in the form of two sets in each row, and are installed at the most On the bracket of the photovoltaic sub-array on the left; 1 AC combiner box is located on the left side of the middle row of photovoltaic sub-arrays, and is installed side by side with string inverter N5-3 and string inverter N5-4 on the far left On the support of the side photovoltaic sub-array, and located on the left side of the string inverter N5-4, the output currents of the six string inverters N5-1 to N5-6 are combined.

As shown in Figure 7, the confluence sub-unit 309 includes 5 photovoltaic sub-arrays A9-1-A9-5, 2 string inverters N9-1 and N9-2, the string inverter N9-1 and string inverter N9-2 are located on the right side of the confluence subunit 309 (that is, the side close to the field road area 204), and are installed side by side on the support of the rightmost photovoltaic sub-array. There is no need for an AC junction box, and it is directly electrically connected to the step-up transformer.

As shown in Figure 8, the confluence sub-unit 310 includes four photovoltaic sub-arrays A10-1-A10-4, two string inverters N10-1 and N10-2, the string inverter N10-1 and string inverter N10-2 are located on the left side of the bus subunit 310 (that is, the side close to the field road area 204), and are installed side by side on the bracket of the leftmost photovoltaic sub-array. There is no need for an AC junction box, and it is directly electrically connected to the step-up transformer.

On the basis of any of the above embodiments, in one embodiment of the present invention, each string inverter is electrically connected to the step-up transformer through a connecting cable. Specifically, in the above-mentioned embodiment, the connecting cables include: a first connecting cable and a second connecting cable arranged side by side on both sides of the field road area, and are electrically connected to the first connecting cable and the second connecting cable. Connect the third connecting cable. As shown in Figure 9, the first connection cable L1 is used to electrically connect the AC junction boxes H1-H4 corresponding to the bus subunits 301-304, and the second connection cable L2 is used to electrically connect the bus subunits 305-308 corresponding to the AC junction boxes H1-H8, the third connection cable L3 is used to electrically connect the string inverters N9-1 and N9-2 corresponding to the junction sub-unit 309, the junction sub-unit 310 corresponds to the string inverters N10-1 and N10-2, the first connecting cable L1, the second connecting cable L2 and the step-up transformer. Preferably, the first connection cable L1 , the second connection cable L2 and the third connection cable L3 are arranged in a cable trench, but the present invention is not limited thereto, and it depends on the situation.

It should be noted that for photovoltaic sub-arrays located in the same bus sub-unit and in the same row, the first row of photovoltaic modules is electrically connected to the first string inverter, and the second row of photovoltaic modules is electrically connected to the second string inverter. Take the first row of photovoltaic sub-arrays A1-1 to A1-5 in the bus subunit 301 as an example, the upper row of photovoltaic modules is electrically connected to the string inverter N1-1, and the lower row of photovoltaic modules is electrically connected to the string inverter N1-1. The string inverter N1-2 is electrically connected, as shown in FIG. 10 . Preferably, each row of photovoltaic modules and their corresponding string inverters are electrically connected through a DC cable L4, and more preferably, the DC cable L4 is laid along the support beams of the photovoltaic modules.

Correspondingly, an embodiment of the present invention also provides a photovoltaic power station including the power generation unit provided in any one of the above embodiments.

To sum up, in the power generation unit and the photovoltaic power station provided by the embodiment of the present invention, the photovoltaic modules in different rows have their corresponding string inverters, so that the power generation unit provided by the embodiment of the present invention can realize Carry out different MPPT tracking for different rows of photovoltaic modules to avoid the problem that one row of photovoltaic sub-arrays in each row of photovoltaic sub-arrays is blocked from light, so that the power of the entire power generation unit is affected by shadows, thereby improving the power generation. Unit power generation efficiency.

For a hillside photovoltaic power station, although the orientations of the rows of photovoltaic sub-arrays in the power generation unit are different, in the power generation unit provided by the embodiment of the present invention, each row of photovoltaic sub-arrays corresponds to a different string inverter, To distinguish the rows of photovoltaic sub-arrays with different orientations, thus solving the problem that the MPPTs of the centralized inverter in the prior art cannot distinguish the rows of photovoltaic sub-arrays with different orientations, thus affecting the overall power generation efficiency of each power generation unit The problem.

Moreover, in the power generation unit provided by the embodiment of the present invention, different rows of photovoltaic sub-arrays are electrically connected to different string inverters, so that when a certain string inverter fails, only the inverters connected to the string inverter will be affected. The photovoltaic sub-array electrically connected to the faulty string inverter is about 28kW, and will not affect other photovoltaic sub-arrays, and the impact range is relatively small.

In addition, in the power generation unit and the photovoltaic power station provided by the embodiment of the present invention, each string inverter, AC junction box and step-up transformer are located on both sides of the road area of the site, so that maintenance and Maintenance is extremely convenient.

Each part in this manual is described in a progressive manner, and each part focuses on the difference from other parts, and the same and similar parts of each part can be referred to each other.

The above description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A power generating unit, characterized in that, comprising: A photovoltaic power generation array, the photovoltaic power generation array comprising a plurality of photovoltaic sub-arrays, the plurality of photovoltaic sub-arrays comprising at least two rows of photovoltaic sub-arrays, each row of photovoltaic sub-arrays comprising a first row of photovoltaic components and a second row of photovoltaic components; An inverter device, the inverter device includes: a string inverter corresponding to each row of photovoltaic modules and electrically connected to each row of photovoltaic modules. 2 . The power generating unit according to claim 1 , further comprising: a current converging device electrically connected to each string inverter. 3 . 3. The power generation unit according to claim 1 or 2, further comprising: a step-up transformer electrically connected to the confluence device. 4 . The power generation unit according to claim 3 , wherein each row of photovoltaic sub-arrays comprises: a first column of photovoltaic sub-arrays and a second column of photovoltaic sub-arrays that are oppositely arranged. 5. The power generation unit according to claim 4, wherein the photovoltaic power generation array includes 129 photovoltaic sub-arrays, and the 129 photovoltaic sub-arrays are divided into 13 rows of photovoltaic sub-arrays, wherein one row of photovoltaic sub-arrays includes 9 photovoltaic sub-arrays, and each row of photovoltaic sub-arrays in the remaining 12 rows of photovoltaic sub-arrays includes 10 photovoltaic sub-arrays; the inverter device includes 52 string inverters. 6 . The power generation unit according to claim 5 , wherein the junction device comprises 8 AC junction boxes. 7. The power generation unit according to claim 6, wherein each AC junction box is electrically connected to 6 string inverters. 8 . The power generation unit according to claim 7 , wherein each string inverter is electrically connected to the step-up transformer through a connection cable. 9. The power generation unit according to any one of claims 1-2 or 4-8, characterized in that each row of photovoltaic modules and its corresponding string inverter are electrically connected by a DC cable. 10. A photovoltaic power station comprising the power generation unit according to any one of claims 1-9.