Photovoltaic equipment matching method, device and photovoltaic tracking system

Abstract

The present invention discloses a method, device, and photovoltaic tracking system for matching photovoltaic devices. The method obtains all tracker codes, inverter codes, and MPPT branch codes in a photovoltaic power station, sends a preset action instruction to a target tracker, and causes the target tracker to perform a corresponding action according to the preset action instruction. After sending the preset action instruction, all inverter data is obtained, and a target MPPT branch code of a target inverter code that meets the expected MPPT branch change characteristics is matched from all inverter data. A device mapping relationship is established between the target tracker and the target MPPT branch code. The target tracker is any tracker selected from the photovoltaic power station. Therefore, the matching method is applied to all trackers in the photovoltaic power station to obtain a mapping relationship between all trackers and MPPT branches. The present invention realizes automatic matching between trackers and MPPT branches, with high matching efficiency and low error rate.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic power generation, and more particularly to a matching method and device between photovoltaic devices and a photovoltaic tracking system. Background Art

[0002] The working principle of a photovoltaic tracking system is to secure photovoltaic modules to a tracking bracket. The tracker controls the bracket to adjust the module's angle, maximizing the amount of solar radiation received by the module and increasing the system's power generation revenue. To improve tracking effectiveness, the industry has recently integrated the MPPT (Maximum Power Point Tracking) circuits of the tracker and inverter. This data feed from the MPPT circuit guides the tracker to precisely control the tracking bracket.

[0003] In complex scenarios, such as mountainous areas, where array shapes, bracket spacing, and module heights vary, unified control of all trackers can lead to poor control results. Therefore, independent control of each tracker is often employed. To achieve independent operation of each branch, after the PV power plant is completed, a one-to-one mapping is performed between the trackers and the inverter's MPPT branches to establish data association.

[0004] Currently, the primary method used is manual search for tracker codes, inverter codes, and MPPT branch codes, and the correlation between them is determined based on the physical connections between the tracker, inverter, and MPPT branches. However, one tracker typically corresponds to one tracking bracket, which holds one to four PV modules. Each MPPT branch of the inverter may be connected to a number of PV modules. Given the large number of PV devices involved in an entire PV power plant (including trackers, inverters, and MPPT branches), manually determining the correlation between each PV device is not only inefficient but also prone to errors. Summary of the Invention

[0005] In view of this, the present invention discloses a matching method and device between photovoltaic devices and a photovoltaic tracking system to achieve automatic matching between the tracker and the MPPT branch, improve matching efficiency and reduce error.

[0006] A matching method between photovoltaic devices is applied to a controller of a photovoltaic tracking system, the matching method comprising:

[0007] Obtain all tracker codes, inverter codes, and MPPT branch codes in the PV power station;

[0008] sending a preset action instruction to a target tracker, so that the target tracker performs a corresponding action according to the preset action instruction, wherein the target tracker is any tracker in the photovoltaic power station, and the preset action instruction carries the tracker code corresponding to the target tracker;

[0009] After sending the preset action instruction, all inverter data are acquired, wherein the all inverter data include: each inverter code and corresponding change characteristics, and each MPPT branch code and corresponding change characteristics;

[0010] Matching a target MPPT branch code of a target inverter code that satisfies an expected MPPT branch change characteristic from all the inverter data, wherein the expected MPPT branch change characteristic corresponds to the preset action instruction;

[0011] A device mapping relationship is established between the target tracker and the target MPPT branch code.

[0012] Optionally, obtaining all tracker codes, inverter codes, and MPPT branch codes in the photovoltaic power station includes:

[0013] Sending a broadcast instruction to all trackers and inverters in the photovoltaic power station, wherein the broadcast instruction carries the instruction of the photovoltaic equipment returning its own encoding;

[0014] The tracker code fed back by each tracker after receiving the broadcast instruction, and the inverter code and corresponding MPPT branch codes fed back by each inverter after receiving the broadcast instruction are obtained.

[0015] Optionally, obtaining the tracker code returned by each tracker after receiving the broadcast instruction, and the inverter code and corresponding MPPT branch codes fed back by each inverter after receiving the broadcast instruction, includes:

[0016] Obtaining the tracker code fed back by each tracker at a first delayed return time after receiving the broadcast instruction, and the inverter code and corresponding MPPT branch codes fed back by each inverter at a second delayed return time after receiving the broadcast instruction;

[0017] The first return time is generated by each tracker using a first random function after receiving the broadcast instruction, and the first return time corresponding to different trackers may be the same or different;

[0018] The second return time is generated by each inverter using a second random function after receiving the broadcast instruction, and the second return time corresponding to different inverters is the same or different;

[0019] The first return time and the second return time are different and are both random times.

[0020] Optionally, when the preset action instruction is to adjust the tracking bracket to an optimal angle, the corresponding expected change characteristic of the MPPT branch is: the power or current becomes larger.

[0021] Optionally, when the preset action instruction is to adjust the tracking bracket by a preset amplitude angle Δθ in a direction away from the optimal inclination angle, the corresponding expected change characteristic of the MPPT branch is: power or current becomes smaller.

[0022] Optionally, when the preset action instruction is to adjust the tracking bracket to a boundary angle, the corresponding expected change characteristic of the MPPT branch is: the power or current is the smallest relative to other inverter strings.

[0023] Optionally, when the preset action instruction is to reciprocate the tracking bracket to a first preset angle, the corresponding expected change characteristic of the MPPT branch is: reciprocating change of power or current.

[0024] Optionally, when the preset action instruction is to adjust the tracking bracket to a second preset angle at a preset rate, the corresponding expected change characteristic of the MPPT branch is: rate change of power or current.

[0025] Optionally, the sending of a preset action instruction to the target tracker so that the target tracker performs a corresponding action according to the preset action instruction includes:

[0026] Selecting p target trackers from the photovoltaic power station each time and determining p preset action instructions, wherein each of the p preset action instructions carries a different execution action, and p is a positive integer;

[0027] A preset action instruction including a corresponding tracker code is sent to each target tracker, so that each target tracker performs a corresponding action according to the received preset action instruction.

[0028] Optionally, the sending of a preset action instruction to the target tracker so that the target tracker performs a corresponding action according to the preset action instruction includes:

[0029] Determine n preset action instructions, wherein each preset action instruction carries a different execution action and contains at least one tracker code, and the n preset action instructions contain a total of m tracker codes, m>n, m is the total number of trackers in the photovoltaic power station, 1<n<N max , N max The maximum number of available preset action instructions;

[0030] Dividing the target trackers corresponding to the same preset action instruction in the photovoltaic power station into the same group to obtain n tracker groups;

[0031] Sending a preset action instruction containing a corresponding tracker code to each target tracker in each tracker group, so that each target tracker performs a corresponding action according to the received preset action instruction, wherein the execution actions carried by each preset action instruction sent to the same tracker group are different.

[0032] A matching device between photovoltaic devices, applied to a controller of a photovoltaic tracking system, comprising:

[0033] The code acquisition unit is used to obtain all tracker codes, inverter codes and MPPT branch codes in the photovoltaic power station;

[0034] an instruction sending unit, configured to send a preset action instruction to a target tracker, so that the target tracker performs a corresponding action according to the preset action instruction, wherein the target tracker is any tracker in the photovoltaic power station, and the preset action instruction carries the tracker code corresponding to the target tracker;

[0035] A data acquisition unit, configured to acquire all inverter data after the instruction sending unit sends the preset action instruction, wherein the all inverter data includes: each inverter code and corresponding change characteristics, and each MPPT branch code and corresponding change characteristics;

[0036] a matching unit, configured to match a target MPPT branch code of a target inverter code that satisfies an expected MPPT branch change characteristic from all the inverter data, wherein the expected MPPT branch change characteristic corresponds to the preset action instruction;

[0037] A mapping unit is used to establish a device mapping relationship between the target tracker and the target MPPT branch code.

[0038] Optionally, the code acquisition unit includes:

[0039] a broadcast instruction sending subunit, configured to send a broadcast instruction to all trackers and inverters in the photovoltaic power station, wherein the broadcast instruction carries the instruction encoded by the photovoltaic equipment itself;

[0040] The code acquisition subunit is used to acquire the tracker code fed back by each tracker after receiving the broadcast instruction, and the inverter code and the corresponding MPPT branch codes fed back by each inverter after receiving the broadcast instruction.

[0041] Optionally, the instruction sending unit includes:

[0042] a selection subunit, configured to select p target trackers from the photovoltaic power station each time and determine p preset action instructions, wherein each of the p preset action instructions carries a different execution action, and p is a positive integer;

[0043] The first action instruction sending subunit is used to send a preset action instruction containing a corresponding tracker code to each target tracker, so that each target tracker performs a corresponding action according to the received preset action instruction.

[0044] Optionally, the instruction sending unit includes:

[0045] An action instruction determination subunit is configured to determine n preset action instructions, wherein each preset action instruction carries a different execution action and contains at least one tracker code, and the n preset action instructions contain a total of m tracker codes, where m>n, m is the total number of trackers in the photovoltaic power station, and 1<n<N max , N max The maximum number of available preset action instructions;

[0046] a dividing subunit, configured to divide the target trackers corresponding to the same preset action instruction in the photovoltaic power station into the same group, to obtain n tracker groups;

[0047] The second action instruction sending subunit is used to send a preset action instruction containing a corresponding tracker code to each target tracker in each tracker group, so that each target tracker performs a corresponding action according to the received preset action instruction, wherein the execution actions carried by each preset action instruction sent to the same tracker group are different.

[0048] A photovoltaic tracking system comprises: a photovoltaic module, a tracker, an inverter and a controller, wherein the controller comprises the matching device described above;

[0049] The controller is communicatively connected to the tracker and the inverter respectively. The tracker is connected to at least one photovoltaic module via a mechanical structure. At least one photovoltaic module is connected to the DC side of the inverter.

[0050] As can be seen from the above technical solution, the present invention discloses a method, device, and photovoltaic tracking system for matching photovoltaic devices. The method obtains all tracker codes, inverter codes, and MPPT branch codes in a photovoltaic power station, sends a preset action instruction to a target tracker, and causes the target tracker to perform a corresponding action according to the preset action instruction. After sending the preset action instruction, all inverter data is obtained, and a target MPPT branch code that satisfies the expected MPPT branch change characteristics of the target inverter code is matched from all inverter data. A device mapping relationship is established between the target tracker and the target MPPT branch code. Since the target tracker is any tracker selected from the photovoltaic power station, the matching method is applied to all trackers in the photovoltaic power station to obtain a mapping relationship between all trackers and MPPT branches in the photovoltaic power station. The present invention automatically matches the tracker and the MPPT branch by controlling the inverter to perform the corresponding action according to the preset action instruction, and after the tracker completes the action, it matches the MPPT branch that satisfies the expected MPPT branch change characteristics. The entire process does not require human intervention, and the matching is efficient and error-prone. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the disclosed drawings without any creative work.

[0052] Figure 1 A schematic structural diagram of a photovoltaic tracking system disclosed in an embodiment of the present invention;

[0053] Figure 2 A flow chart of a method for matching photovoltaic devices disclosed in an embodiment of the present invention;

[0054] Figure 3 A schematic diagram of a preset action instruction disclosed in an embodiment of the present invention for adjusting the tracking bracket to an optimal angle;

[0055] Figure 4 A schematic diagram of the mapping relationship between a tracker and an MPPT branch of a power station disclosed in an embodiment of the present invention;

[0056] Figure 5 A schematic diagram of a group batch matching process disclosed in an embodiment of the present invention;

[0057] Figure 6 A schematic diagram of another process of group batch matching disclosed in an embodiment of the present invention;

[0058] Figure 7 The present invention is a schematic structural diagram of a matching device between photovoltaic devices disclosed in an embodiment of the present invention. DETAILED DESCRIPTION

[0059] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0060] Embodiments of the present invention disclose a method, apparatus, and photovoltaic tracking system for matching photovoltaic devices. These methods obtain all tracker codes, inverter codes, and MPPT branch codes in a photovoltaic power station, send a preset action instruction to a target tracker, causing the target tracker to perform a corresponding action according to the preset action instruction. After sending the preset action instruction, all inverter data is obtained, and a target MPPT branch code that satisfies the expected MPPT branch variation characteristics is matched from all inverter data. A device mapping relationship is established between the target tracker and the target MPPT branch code. Since the target tracker is any tracker selected from the photovoltaic power station, the matching method is applied to all trackers in the photovoltaic power station, thereby obtaining a mapping relationship between all trackers and MPPT branches in the photovoltaic power station. The present invention automatically matches the tracker with the MPPT branch by controlling the inverter to perform the corresponding action according to the preset action instruction and, after the tracker completes the action, matching the MPPT branch that satisfies the expected MPPT branch variation characteristics. This process requires no human intervention, resulting in high matching efficiency and low error rates.

[0061] To understand the working principle of photovoltaic device matching, see Figure 1 , a schematic structural diagram of a photovoltaic tracking system disclosed in an embodiment of the present invention, the photovoltaic tracking system includes: a controller, a photovoltaic module, a tracker and an inverter.

[0062] The controller communicates with the tracker and inverter via RS485 or wireless communication. It obtains inverter operating data, analyzes it, and issues commands to the tracker. In practice, the controller can be embedded within the tracker and inverter, or installed independently.

[0063] The tracker is connected to at least one photovoltaic module through a mechanical structure and can automatically adjust the angle of the photovoltaic module to change the output power or current data of the photovoltaic module. Figure 1 When there is a photovoltaic array located between the tracker and the inverter, the tracker and the photovoltaic array are connected by a mechanical structure. When there are multiple photovoltaic arrays, the multiple photovoltaic arrays are connected electrically. The tracker can automatically adjust the angle of each photovoltaic array and change the radiation received by the surface of the photovoltaic modules in each photovoltaic array.

[0064] The DC side of the inverter is connected to at least one photovoltaic module. When there are multiple photovoltaic modules, the multiple photovoltaic modules that are electrically connected are connected in series to form a photovoltaic string and connected in parallel to the DC side of the inverter.

[0065] In order to achieve independent operation between branches, it is necessary to map the tracker to the MPPT branch of the inverter one by one. Figure 1 The n trackers in the system are mapped one-to-one with the n MPPT branches of the inverter.

[0066] To address the inefficiency and error-prone nature of the existing manual method for determining the relationships between photovoltaic devices (including trackers, inverters, and MPPT branches), the present invention proposes the following method:

[0067] See also Figure 2 , a flow chart of a matching method between photovoltaic devices disclosed in an embodiment of the present invention, the method is applied to Figure 1 The controller of the photovoltaic tracking system shown in FIG. 1 , wherein the matching method includes:

[0068] Step S101: Obtain all tracker codes, inverter codes, and MPPT branch codes in the photovoltaic power station;

[0069] Coding is the process of giving things or concepts certain regularities, such as numbers, symbols, and text that are easily recognized and processed by humans or machines.

[0070] In this embodiment, each tracker has a unique code, namely, a tracker code, which is used as its own identification during communication. The tracker code is, for example, a specific ID number or a serial number, such as tracker 4.

[0071] The inverter and its MPPT branch also have unique codes that serve as their identification during communication. For example, "Inverter 3-MPPT2" identifies the second MPPT branch of inverter 3. The codes for the inverter and its MPPT branch can also be represented by ID numbers, depending on actual needs and not limited in this disclosure.

[0072] In practical applications, the inverter code and the MPPT branch code can be combined into the inverter-MPPT combined code.

[0073] Step S102: sending a preset action instruction to the target tracker, so that the target tracker performs a corresponding action according to the preset action instruction;

[0074] The target tracker is any tracker in a photovoltaic power station, and the preset action instruction carries the tracker code corresponding to the target tracker.

[0075] In practical applications, a tracker is randomly selected from a photovoltaic power station as a target tracker, and the preset action instruction includes the tracker code of the target tracker and the action that the target tracker needs to perform.

[0076] Step S103: After sending the preset action instruction, obtain all inverter data;

[0077] Among them, the data of all inverters include: each inverter code and corresponding change characteristics, and each MPPT branch code and corresponding change characteristics.

[0078] The corresponding change characteristics of the inverter and the corresponding change characteristics of the MPPT branch include but are not limited to power, current, etc.

[0079] Step S104: Matching a target MPPT branch code of a target inverter code that meets the expected MPPT branch change characteristics from all the inverter data;

[0080] Among them, the expected change characteristics of the MPPT branch correspond to the preset action instructions.

[0081] The expected MPPT branch change characteristics are the expected changes in the MPPT branches mapped to the target inverter, determined in advance by the controller based on preset action instructions. Specifically, when a preset action instruction is sent to the target tracker, the MPPT branches mapped to the target inverter will produce the expected changes corresponding to the preset action instruction. Based on this, the present invention can match the target inverter code that meets the target MPPT branch expected change characteristics from the data of all inverters.

[0082] Step S105: Establish a device mapping relationship between the target tracker and the target MPPT branch code.

[0083] In this embodiment, the target tracker is any tracker selected from the photovoltaic power station. The matching method disclosed in this embodiment is applied to all trackers in the photovoltaic power station to obtain the mapping relationship between all trackers in the photovoltaic power station and the MPPT branches.

[0084] In summary, the present invention discloses a method for matching photovoltaic devices. The method obtains all tracker codes, inverter codes, and MPPT branch codes in a photovoltaic power station, sends a preset action instruction to a target tracker, and causes the target tracker to perform a corresponding action according to the preset action instruction. After sending the preset action instruction, the method obtains all inverter data, matches the target inverter code that meets the expected MPPT branch change characteristics from all inverter data, and establishes a device mapping relationship between the target tracker and the target MPPT branch code. Since the target tracker is any tracker selected from the photovoltaic power station, the matching method is applied to all trackers in the photovoltaic power station to obtain a mapping relationship between all trackers and MPPT branches in the photovoltaic power station. The present invention controls the inverter to perform the corresponding action according to the preset action instruction, and after the tracker performs the action, matches the MPPT branch that meets the expected MPPT branch change characteristics, thereby completing the automatic matching between the tracker and the MPPT branch. The entire process does not require human intervention, and the matching efficiency is high and error-prone.

[0085] In the above embodiment, step S101 can be implemented in two ways when obtaining all tracker codes, inverter codes, and MPPT branch codes in the photovoltaic power station:

[0086] The first method is manual entry, which is to write all tracker codes, inverter codes and MPPT branch codes into the controller of the photovoltaic tracking system according to a certain file format.

[0087] However, the manual entry method is not only time-consuming and labor-intensive, but also prone to errors. Based on this, the present invention provides a second quick method of automatic entry.

[0088] Therefore, step S101 may specifically include:

[0089] (1) Sending a broadcast command to all trackers and inverters in the photovoltaic power station, wherein the broadcast command carries the command encoded by the photovoltaic equipment itself;

[0090] (2) Obtain the tracker code returned by each tracker after receiving the broadcast command, as well as the inverter code and corresponding MPPT branch codes fed back by each inverter after receiving the broadcast command.

[0091] Specifically, the controller broadcasts a command to all trackers and inverters in the PV power plant. This command includes instructions for the PV devices to transmit their own codes. In other words, upon receiving the command, the tracker must transmit its own code back to the controller. Similarly, upon receiving the command, the inverter must transmit its own code and the codes of each connected MPPT branch back to the controller.

[0092] To stagger the time at which multiple trackers and inverters transmit their own codes, and avoid communication congestion caused by all PV devices uploading their own codes at the same time, obtain the tracker code returned by each tracker after receiving the broadcast command, as well as the inverter code and corresponding MPPT branch codes fed back by each inverter after receiving the broadcast command. Specifically, the following information is needed:

[0093] Obtain the tracker code fed back by each tracker after receiving the broadcast command and at the first delayed return time, as well as the inverter code and corresponding MPPT branch codes fed back by each inverter after receiving the broadcast command and at the second delayed return time.

[0094] The first return time is generated by each tracker using a first random function after receiving the broadcast instruction, and the first return time corresponding to different trackers may be the same or different;

[0095] The second return time is generated by each inverter using a second random function after receiving the broadcast instruction, and the second return times corresponding to different inverters are the same or different;

[0096] The first return time and the second return time are different and are both random times.

[0097] To minimize the time it takes for multiple trackers and inverters to transmit their own codes, and to avoid communication congestion caused by all PV devices simultaneously uploading their own codes, the present invention uses a first random function to generate a first transmission time Δt1 after receiving a broadcast command and before transmitting its own code. Each tracker then transmits its own code after reaching the first transmission time Δt1. The first transmission time Δt1 generated by each tracker can be the same or different, but it is important to avoid multiple trackers transmitting their own codes at the same time.

[0098] Similarly, after receiving the broadcast command, each inverter uses a second random function to generate a second return time △t2 before returning its own code, and returns its own code after reaching the second return time △t2. Among them, the second return time △t2 generated by each inverter can be the same or different. It is necessary to avoid multiple inverters returning their own codes at the same time.

[0099] Similarly, the first return time Δt1 and the second return time Δt2 also need to avoid being the same, so that the tracker and inverter can return their own codes at staggered times.

[0100] Regardless of whether manual or automatic entry is used, the controller of the photovoltaic tracking system will eventually obtain two data tables. One data table is the inverter-MPPT combination code, which is composed of the inverter code and the MPPT code. The basic form is shown in Table 1. Table 1 is as follows:

[0101] Table 1

[0102] Inverter-MPPT combination code: INV1-MPPT1 INV1-MPPT2 INV1-MPPT3 INV2-MPPT1 INV2-MPPT2 INV2-MPPT3 INV3-MPPT1 INV3-MPPT2 ……

[0103] INV in Table 1 represents an inverter.

[0104] Another data sheet is the tracker code, the basic form of which is shown in Table 2. Table 2 is as follows:

[0105] Table 2

[0106] Tracker code: Tracker 3 Tracker 4 Tracker 6 Tracker 1 Tracker 2 Tracker 9 Tracker 5 Tracker 8 ……

[0107] It should be noted that the data in Table 1 and Table 2 are independent at this time and there is no mapping relationship between them.

[0108] It should be noted that the present invention sends multiple types of preset action instructions to the target tracker. Different preset action instructions correspond to different execution actions. Therefore, the corresponding expected change characteristics of the MPPT branches are also different, which are listed as follows:

[0109] (1) When the preset action instruction is to adjust the tracking bracket to the optimal angle, the corresponding expected change characteristics of the MPPT branch are: power or current increases.

[0110] When the preset action instruction sent to the target tracker is to adjust the tracking bracket to the optimal angle, the expected change characteristics of the corresponding MPPT branch are: the power or current increases, while the power or current of the MPPT branches of other inverters changes within the normal range.

[0111] For details, see Figure 3 , a preset action instruction disclosed in an embodiment of the present invention is a schematic diagram of adjusting the tracking bracket to an optimal angle, Figure 3 The specific actions and judgment process are demonstrated in the following. Assume that Tracker 3 is randomly selected as the target tracker from Tracker 1, Tracker 2, and Tracker 3. The controller issues a preset action command to Tracker 3, causing it to adjust its tracking bracket to the optimal angle. After the adjustment stabilizes, the expected behavior of the MPPT branch corresponding to Tracker 3 is as follows: The current of the MPPT branch will be greater than the current of the other strings. For example, if the current of Inverter 5-MPPT1 is detected to be 6A, while the currents of the other branches remain essentially unchanged—that is, the currents of Inverter 5-MPPT2 and Inverter 5-MPPT3 are both 4A—then it can be determined that Tracker 3 is mapped to Inverter 5-MPPT1.

[0112] (2) When the preset action instruction is to adjust the tracking bracket to a preset amplitude angle △θ in the direction away from the optimal inclination angle, the corresponding expected change characteristics of the MPPT branch are: the power or current becomes smaller.

[0113] When the preset action instruction sent to the target tracker is to adjust the tracking bracket by the preset amplitude angle △θ away from the optimal tilt angle, that is, to adjust the preset amplitude angle △θ in the opposite direction of the optimal tilt angle, the expected change characteristics of the corresponding MPPT branch are: the power or current becomes smaller, while the power or current of the MPPT branches of other inverters changes within the normal range.

[0114] (3) When the preset action instruction is to adjust the tracking bracket to the boundary angle, the expected change characteristics of the corresponding MPPT branch are: the power or current is the smallest relative to other inverter strings.

[0115] Among them, the boundary angle, that is, the tracking bracket will set a protection angle or limit angle.

[0116] When the preset action instruction sent to the target tracker is to adjust the tracking bracket to a boundary angle, such as -60° or 60°, the expected change characteristics of the corresponding MPPT branch are: the power or current is the smallest relative to other inverter strings.

[0117] (4) When the preset action instruction is to adjust the tracking bracket back and forth to the first preset angle, the corresponding expected change characteristics of the MPPT branch are: power or current changes back and forth.

[0118] When the preset action instruction sent to the target tracker is to adjust the tracking bracket back and forth to the first preset angle, dynamic adjustment is performed, that is, the first preset angle is first adjusted in one direction, and then adjusted in the opposite direction. At this time, there will be two situations: 1. First adjust in the direction of the optimal tilt angle, and then adjust back. At this time, the corresponding expected change characteristics of the MPPT branch are: the power or current first increases, and then decreases; 2. First adjust in the direction away from the optimal tilt angle, and then return. At this time, the corresponding expected change characteristics of the MPPT branch are: the power or current first decreases, and then increases. It can be seen from this that when the preset action instruction is to adjust the tracking bracket back and forth to the first preset angle, the corresponding expected change characteristics of the MPPT branch are: the power or current changes back and forth. The power or current of the MPPT branches of other inverters changes within the normal range.

[0119] (5) When the preset action instruction is to adjust the tracking bracket to the second preset angle at a preset rate, the corresponding expected change characteristic of the MPPT branch is: the rate of change of power or current.

[0120] When the preset action command sent to the target tracker is to adjust the tracking bracket to a second preset angle at a preset rate, the expected change characteristics of the corresponding MPPT branch are: rapid changes in power or current, while the power or current of the MPPT branches of other inverters remain unchanged or change slowly. Therefore, when multiple trackers are adjusted simultaneously, the MPPT branch of the inverter corresponding to the target tracker can be matched based on the expected change speed of the MPPT branch of the corresponding inverter.

[0121] It should be noted that the preset action instructions include but are not limited to the above five types.

[0122] For the matching process between photovoltaic devices disclosed in the present invention, take a photovoltaic power station where each inverter has three MPPT branches as an example, such as inverter INV1 corresponding to MPPT1, MPPT2 and MPPT3. Figure 2 In the steps shown, the preset action instruction is selected to adjust the preset amplitude angle △θ to the direction away from the optimal tilt angle, and the tracker and the MPPT branch are mapped one by one. Finally, the complete association relationship between all trackers and all MPPT branches is obtained. The result is as follows Figure 4 The following diagram shows the mapping relationship between trackers and MPPT branches in a power plant. This allows the tracking process to be optimized by specifying the corresponding tracker adjustment angle based on the data collected by a specific MPPT branch during normal operation of the PV plant.

[0123] If a 2P tracker is combined with a string inverter, there may be four PV panels on one tracker, corresponding to two MPPT branches. The matching results are shown in Table 3. In this case, one tracker corresponds to two MPPT branches.

[0124] Table 3

[0125]

[0126] In a centralized power station, an inverter has a large capacity, but the number of MPPT branches is small, with only 1-4 MPPT branches. The matching results are shown in Table 4. In this case, multiple trackers correspond to one MPPT branch.

[0127] Table 4

[0128]

[0129] It should be noted that the automatic matching process in Tables 3 and 4 is implemented by specifying one tracker at a time and sending a preset action instruction. However, in actual photovoltaic power plants, the capacity is large and there are many photovoltaic devices. Determining the mapping relationship between photovoltaic devices one by one is inefficient. Therefore, to improve matching efficiency, the present invention also provides a batch matching process, which is as follows:

[0130] To further optimize the above embodiment, step S102 may specifically include:

[0131] Selecting p target trackers from the photovoltaic power station each time and determining p preset action instructions, wherein each of the p preset action instructions carries a different execution action, and p is a positive integer;

[0132] A preset action instruction including a corresponding tracker code is sent to each target tracker, so that each target tracker performs a corresponding action according to the received preset action instruction.

[0133] For example, assuming p=5, that is, from all the trackers in the PV power plant, 5 target trackers are selected each time, and 5 preset action instructions with different execution actions and different tracker codes are issued at the same time. Each target tracker performs the corresponding action according to the corresponding preset action instruction received. The target MPPT branch code that meets the expected change characteristics of the MPPT branch can be matched from the numerous MPPT branches, thereby realizing the mapping relationship between the 5 target trackers and the corresponding target MPPT branch codes at one time.

[0134] In addition to the above matching method, you can also use a method of sending preset action instructions in batches.

[0135] Therefore, to further optimize the above embodiment, step S102 may specifically include:

[0136] (1) Determine n preset action instructions;

[0137] Each preset action instruction carries a different execution action and contains at least one tracker code. The n preset action instructions contain a total of m tracker codes, where m>n, m is the total number of trackers in the photovoltaic power station, and 1<n<N max , N max The maximum number of available preset action commands.

[0138] (2) dividing the target trackers corresponding to the same preset action instruction in the photovoltaic power station into the same group to obtain n tracker groups;

[0139] (3) Sending a preset action instruction containing a corresponding tracker code to each target tracker in each tracker group, so that each target tracker performs a corresponding action according to the received preset action instruction.

[0140] The preset action instructions sent to the same tracker group carry different execution actions.

[0141] This embodiment first divides all trackers in a PV power plant into n groups based on n preset action instructions carrying different execution actions. Then, a preset action instruction containing the corresponding tracker code is sent to the target tracker in each group. Each target tracker executes the corresponding action according to the received preset action instruction, further refining the mapping relationship between target trackers and MPPT branches within the group. After several rounds, a unique mapping relationship between all MPPT branches and target trackers is finally determined.

[0142] It can be seen from this that the batch grouping and multiple groups of parallel matching method can greatly reduce the matching time of photovoltaic equipment, so that the mapping relationship between the target tracker and the MPPT branch can be identified at the fastest speed.

[0143] To better understand the batch grouping method, an example is given below. Figure 5 , a schematic diagram of a group batch matching process disclosed in an embodiment of the present invention, assuming there are 16 trackers, 4 preset action instructions carrying different execution actions are selected as the first batch instruction to be issued, and each preset action instruction includes four tracker codes. Then, the 16 trackers can be divided into four groups, namely:

[0144] The first group includes: tracker 5, tracker 2, tracker 9 and tracker 4. The expected change characteristics of the MPPT branches corresponding to the four trackers in the first group are all: maximum power.

[0145] The second group includes tracker 3, tracker 6, tracker 11 and tracker 8. The expected change characteristics of the MPPT branches corresponding to the four trackers in the second group are all: minimum power.

[0146] The third group includes tracker 7, tracker 10, tracker 1 and tracker 16. The expected change characteristics of the MPPT branches corresponding to the four trackers in the third group are all: power decreases.

[0147] The fourth group includes tracker 13, tracker 14, tracker 15 and tracker 12. The expected change characteristics of the MPPT branches corresponding to the four trackers in the fourth group are all: fast power change.

[0148] Because the trackers in each group cannot uniquely determine the corresponding MPPT branch, a second batch of preset action instructions is then issued. Since each group contains four trackers, four preset action instructions carrying different execution actions are still selected as the second batch instruction issuance. Four preset action instructions containing the corresponding tracker codes are sent to the four trackers in the same group, causing each target tracker to perform the corresponding action based on the received preset action instructions. The preset action instructions sent to the same tracker group carry different execution actions, thereby further matching the MPPT branch corresponding to each tracker in the group.

[0149] It can be seen from this that this batch method only operates in two steps as a whole, that is, matching all trackers and MPPT branches.

[0150] In the above embodiment, there is an integer multiple relationship between the number n of preset action instructions and the number m of tracker codes, so the trackers can be grouped evenly. In practical applications, the trackers can also be grouped unevenly.

[0151] See also Figure 6 , a schematic diagram of another group batch matching process disclosed in an embodiment of the present invention. Assuming there are 10 trackers, during the first batch grouping, 4 preset action instructions carrying different execution actions are selected as the first batch instructions to be issued. Due to the uneven distribution, the number of trackers corresponding to each action will be different. Figure 6 Four groups are shown, namely:

[0152] The first group includes tracker 5, tracker 2, and tracker 9. The expected change characteristics of the MPPT branches corresponding to the three trackers in the first group are all: maximum power.

[0153] The second group includes tracker 3 and tracker 6. The expected change characteristics of the MPPT branches corresponding to the two trackers in the second group are both: minimum power.

[0154] The third group includes tracker 7. The expected change characteristics of the MPPT branches corresponding to the trackers in the third group are all: power decreases.

[0155] The fourth group includes tracker 1, tracker 10, tracker 4, and tracker 8. The expected change characteristics of the MPPT branches corresponding to the four trackers in the fourth group are all: fast power change.

[0156] Because the trackers in each group cannot uniquely determine the corresponding MPPT branch, a second batch of preset action instructions is then issued. Based on the number of trackers in each group, a corresponding number of preset action instructions are selected as the second batch instruction issuance. Multiple preset action instructions containing corresponding tracker codes are sent to multiple trackers in the same group, causing each target tracker to perform the corresponding action based on the received preset action instructions. The preset action instructions sent to the same tracker group carry different execution actions, thereby further matching the MPPT branch corresponding to each tracker in the group.

[0157] Corresponding to the above method embodiment, the present invention also discloses a matching device between photovoltaic devices.

[0158] See also Figure 7 , a schematic diagram of a matching device between photovoltaic devices disclosed in an embodiment of the present invention, the device is applied to Figure 1 The controller of the photovoltaic tracking system shown in FIG. 1 , wherein the matching device includes:

[0159] The code acquisition unit 201 is used to acquire all tracker codes, inverter codes and MPPT branch codes in the photovoltaic power station;

[0160] In this embodiment, each tracker has a unique code, namely, a tracker code, which is used as its own identification during communication. The tracker code is, for example, a specific ID number or a serial number, such as tracker 4.

[0161] The inverter and its MPPT branch also have unique codes that serve as their identification during communication. For example, "Inverter 3-MPPT2" identifies the second MPPT branch of inverter 3. The codes for the inverter and its MPPT branch can also be represented by ID numbers, depending on actual needs and not limited in this disclosure.

[0162] In practical applications, the inverter code and the MPPT branch code can be combined into the inverter-MPPT combined code.

[0163] an instruction sending unit 202, configured to send a preset action instruction to a target tracker, so that the target tracker performs a corresponding action according to the preset action instruction, wherein the target tracker is any tracker in the photovoltaic power station, and the preset action instruction carries the tracker code corresponding to the target tracker;

[0164] In practical applications, a tracker is randomly selected from a photovoltaic power station as a target tracker, and the preset action instruction includes the tracker code of the target tracker and the action that the target tracker needs to perform.

[0165] The data acquisition unit 203 is configured to acquire all inverter data after the instruction sending unit 202 sends the preset action instruction, wherein the all inverter data includes: each inverter code and corresponding change characteristics, and each MPPT branch code and corresponding change characteristics;

[0166] A matching unit 204 is configured to match a target MPPT branch code of a target inverter code that satisfies an expected MPPT branch change characteristic from all the inverter data, wherein the expected MPPT branch change characteristic corresponds to the preset action instruction;

[0167] When the target tracker performs the corresponding action according to the preset action instruction, the MPPT branch that has a mapping relationship with the target inverter will produce the expected change corresponding to the preset action instruction. Based on this, the present invention can match the target MPPT branch code of the target inverter code that meets the expected change characteristics of the MPPT branch from the data of all inverters.

[0168] The mapping unit 205 is configured to establish a device mapping relationship between the target tracker and the target MPPT branch code.

[0169] In this embodiment, the target tracker is any tracker selected from the photovoltaic power station. The matching method disclosed in this embodiment is applied to all trackers in the photovoltaic power station to obtain the mapping relationship between all trackers in the photovoltaic power station and the MPPT branches.

[0170] In summary, the present invention discloses a matching device between photovoltaic devices, which obtains all tracker codes, inverter codes, and MPPT branch codes in a photovoltaic power station, sends a preset action instruction to a target tracker, and causes the target tracker to perform a corresponding action according to the preset action instruction. After sending the preset action instruction, all inverter data is obtained, and a target MPPT branch code of a target inverter code that meets the expected change characteristics of the MPPT branch is matched from all inverter data, and a device mapping relationship is established between the target tracker and the target MPPT branch code. Since the target tracker is any tracker selected from the photovoltaic power station, the matching method is applied to all trackers in the photovoltaic power station, and a mapping relationship between all trackers and MPPT branches in the photovoltaic power station can be obtained. The present invention controls the inverter to perform the corresponding action according to the preset action instruction, and after the tracker performs the action, matches the MPPT branch that meets the expected change characteristics of the MPPT branch, thereby completing the automatic matching between the tracker and the MPPT branch. The entire process does not require human intervention, and the matching efficiency is high and error-prone.

[0171] To further optimize the above embodiment, the code acquisition unit 201 may include:

[0172] a broadcast instruction sending subunit, configured to send a broadcast instruction to all trackers and inverters in the photovoltaic power station, wherein the broadcast instruction carries the instruction encoded by the photovoltaic equipment itself;

[0173] The code acquisition subunit is used to acquire the tracker code fed back by each tracker after receiving the broadcast instruction, and the inverter code and the corresponding MPPT branch codes fed back by each inverter after receiving the broadcast instruction.

[0174] In order to stagger the time at which multiple trackers and multiple inverters transmit their own codes as much as possible and avoid communication congestion caused by all photovoltaic devices uploading their own codes at the same time, the code acquisition subunit can be specifically used to obtain the tracker code fed back by each tracker after receiving the broadcast command at the first delayed return time, and the inverter code and corresponding MPPT branch codes fed back by each inverter after receiving the broadcast command at the second delayed return time;

[0175] The first return time is generated by each tracker using a first random function after receiving the broadcast instruction, and the first return time corresponding to different trackers may be the same or different;

[0176] The second return time is generated by each inverter using a second random function after receiving the broadcast instruction, and the second return time corresponding to different inverters is the same or different;

[0177] The first return time and the second return time are different and are both random times.

[0178] Specifically, the controller broadcasts a command to all trackers and inverters in the PV power plant. This command includes instructions for the PV devices to transmit their own codes. In other words, upon receiving the command, the tracker must transmit its own code back to the controller. Similarly, upon receiving the command, the inverter must transmit its own code and the codes of each connected MPPT branch back to the controller.

[0179] To minimize the time it takes for multiple trackers and inverters to transmit their own codes, and to avoid communication congestion caused by all PV devices uploading their own codes simultaneously, each tracker, after receiving the broadcast command and before transmitting its own code, uses a first random function to generate a first transmission time △t1. The first transmission time △t1 generated by each tracker can be the same or different. It is important to avoid multiple trackers transmitting their own codes at the same time.

[0180] Similarly, after receiving the broadcast command, each inverter uses a second random function to generate a second return time △t2 before returning its own code, and returns its own code after reaching the second return time △t2. Among them, the second return time △t2 generated by each inverter can be the same or different. It is necessary to avoid multiple inverters returning their own codes at the same time.

[0181] Similarly, the first return time Δt1 and the second return time Δt2 also need to avoid being the same, so that the tracker and inverter can return their own codes at staggered times.

[0182] It should be noted that there are multiple types of preset action instructions sent to the target tracker in the present invention. Different preset action instructions correspond to different execution actions. Therefore, the corresponding expected change characteristics of the MPPT branches are also different. Please refer to the corresponding part of the method embodiment for details, which will not be repeated here.

[0183] To further optimize the above embodiment, the instruction sending unit 202 may include:

[0184] a selection subunit, configured to select p target trackers from the photovoltaic power station each time and determine p preset action instructions, wherein each of the p preset action instructions carries a different execution action, and p is a positive integer;

[0185] The first action instruction sending subunit is used to send a preset action instruction containing a corresponding tracker code to each target tracker, so that each target tracker performs a corresponding action according to the received preset action instruction.

[0186] To further optimize the above embodiment, the instruction sending unit 202 may further include:

[0187] An action instruction determination subunit is configured to determine n preset action instructions, wherein each preset action instruction carries a different execution action and contains at least one tracker code, and the n preset action instructions contain a total of m tracker codes, where m>n, m is the total number of trackers in the photovoltaic power station, and 1<n<N max , N max The maximum number of available preset action instructions;

[0188] a dividing subunit, configured to divide the target trackers corresponding to the same preset action instruction in the photovoltaic power station into the same group, to obtain n tracker groups;

[0189] The second action instruction sending subunit is used to send a preset action instruction containing a corresponding tracker code to each target tracker in each tracker group, so that each target tracker performs a corresponding action according to the received preset action instruction, wherein the execution actions carried by each preset action instruction sent to the same tracker group are different.

[0190] It should be noted that, for the specific working principles of the various components in the device embodiment, please refer to the corresponding parts of the method embodiment, which will not be repeated here.

[0191] Finally, it should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or device comprising the element.

[0192] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0193] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one 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 present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for matching photovoltaic devices, characterized in that: A controller applied to a photovoltaic tracking system, wherein the matching method includes: Obtain all tracker codes, inverter codes, and MPPT branch codes in the PV power station; sending a preset action instruction to a target tracker, so that the target tracker performs a corresponding action according to the preset action instruction, wherein the target tracker is any tracker in the photovoltaic power station, and the preset action instruction carries the tracker code corresponding to the target tracker; After sending the preset action instruction, all inverter data are acquired, wherein the all inverter data include: each inverter code and corresponding change characteristics, and each MPPT branch code and corresponding change characteristics; Matching a target MPPT branch code of a target inverter code that satisfies an expected MPPT branch change characteristic from all the inverter data, wherein the expected MPPT branch change characteristic corresponds to the preset action instruction; A device mapping relationship is established between the target tracker and the target MPPT branch code.

2. The matching method according to claim 1, wherein: The acquisition of all tracker codes, inverter codes, and MPPT branch codes in the photovoltaic power station includes: Sending a broadcast instruction to all trackers and inverters in the photovoltaic power station, wherein the broadcast instruction carries the instruction of the photovoltaic equipment returning its own encoding; The tracker code fed back by each tracker after receiving the broadcast instruction, and the inverter code and corresponding MPPT branch codes fed back by each inverter after receiving the broadcast instruction are obtained.

3. The matching method according to claim 2, characterized in that: The obtaining of the tracker code returned by each tracker after receiving the broadcast instruction, and the inverter code and the corresponding MPPT branch codes fed back by each inverter after receiving the broadcast instruction, includes: Obtaining the tracker code fed back by each tracker at a first delayed return time after receiving the broadcast instruction, and the inverter code and corresponding MPPT branch codes fed back by each inverter at a second delayed return time after receiving the broadcast instruction; The first return time is generated by each tracker using a first random function after receiving the broadcast instruction, and the first return time corresponding to different trackers may be the same or different; The second return time is generated by each inverter using a second random function after receiving the broadcast instruction, and the second return time corresponding to different inverters is the same or different; The first return time and the second return time are different and are both random times.

4. The matching method according to claim 1, wherein: When the preset action instruction is to adjust the tracking bracket to the optimal angle, the corresponding expected change characteristic of the MPPT branch is: the power or current becomes larger.

5. The matching method according to claim 1, wherein: When the preset action instruction is to adjust the tracking bracket by a preset amplitude angle Δθ in a direction away from the optimal inclination angle, the corresponding expected change characteristic of the MPPT branch is: power or current becomes smaller.

6. The matching method according to claim 1, characterized in that: When the preset action instruction is to adjust the tracking bracket to a boundary angle, the corresponding expected change characteristic of the MPPT branch is: the power or current is the smallest relative to other inverter strings.

7. The matching method according to claim 1, characterized in that: When the preset action instruction is to reciprocate the tracking bracket to a first preset angle, the corresponding expected change characteristic of the MPPT branch is: reciprocating change of power or current.

8. The matching method according to claim 1, wherein: When the preset action instruction is to adjust the tracking bracket to a second preset angle at a preset rate, the corresponding expected change characteristic of the MPPT branch is: a rate change of power or current.

9. The matching method according to claim 1, wherein: The sending of a preset action instruction to the target tracker so that the target tracker performs a corresponding action according to the preset action instruction includes: Selecting p target trackers from the photovoltaic power station each time and determining p preset action instructions, wherein each of the p preset action instructions carries a different execution action, and p is a positive integer; A preset action instruction including a corresponding tracker code is sent to each target tracker, so that each target tracker performs a corresponding action according to the received preset action instruction.

10. The matching method according to claim 1, wherein: The sending of a preset action instruction to the target tracker so that the target tracker performs a corresponding action according to the preset action instruction includes: Determine n preset action instructions, wherein each preset action instruction carries a different execution action and contains at least one tracker code, and the n preset action instructions contain a total of m tracker codes, m>n, m is the total number of trackers in the photovoltaic power station, 1<n<N max , N max The maximum number of available preset action instructions; Dividing the target trackers corresponding to the same preset action instruction in the photovoltaic power station into the same group to obtain n tracker groups; Sending a preset action instruction containing a corresponding tracker code to each target tracker in each tracker group, so that each target tracker performs a corresponding action according to the received preset action instruction, wherein the execution actions carried by each preset action instruction sent to the same tracker group are different.

11. A matching device between photovoltaic devices, characterized in that: A controller for a photovoltaic tracking system, wherein the matching device comprises: The code acquisition unit is used to obtain all tracker codes, inverter codes and MPPT branch codes in the photovoltaic power station; an instruction sending unit, configured to send a preset action instruction to a target tracker, so that the target tracker performs a corresponding action according to the preset action instruction, wherein the target tracker is any tracker in the photovoltaic power station, and the preset action instruction carries the tracker code corresponding to the target tracker; A data acquisition unit, configured to acquire all inverter data after the instruction sending unit sends the preset action instruction, wherein the all inverter data includes: each inverter code and corresponding change characteristics, and each MPPT branch code and corresponding change characteristics; a matching unit, configured to match a target MPPT branch code of a target inverter code that satisfies an expected MPPT branch change characteristic from all the inverter data, wherein the expected MPPT branch change characteristic corresponds to the preset action instruction; A mapping unit is used to establish a device mapping relationship between the target tracker and the target MPPT branch code.

12. The matching device according to claim 11, characterized in that: The code acquisition unit includes: a broadcast instruction sending subunit, configured to send a broadcast instruction to all trackers and inverters in the photovoltaic power station, wherein the broadcast instruction carries the instruction encoded by the photovoltaic equipment itself; The code acquisition subunit is used to acquire the tracker code fed back by each tracker after receiving the broadcast instruction, and the inverter code and the corresponding MPPT branch codes fed back by each inverter after receiving the broadcast instruction.

13. The matching device according to claim 11, characterized in that: The instruction sending unit includes: a selection subunit, configured to select p target trackers from the photovoltaic power station each time and determine p preset action instructions, wherein each of the p preset action instructions carries a different execution action, and p is a positive integer; The first action instruction sending subunit is used to send a preset action instruction containing a corresponding tracker code to each target tracker, so that each target tracker performs a corresponding action according to the received preset action instruction.

14. The matching device according to claim 11, characterized in that The instruction sending unit includes: An action instruction determination subunit is configured to determine n preset action instructions, wherein each preset action instruction carries a different execution action and contains at least one tracker code, and the n preset action instructions contain a total of m tracker codes, where m>n, m is the total number of trackers in the photovoltaic power station, and 1<n<N max , N max The maximum number of available preset action instructions; a dividing subunit, configured to divide the target trackers corresponding to the same preset action instruction in the photovoltaic power station into the same group, to obtain n tracker groups; The second action instruction sending subunit is used to send a preset action instruction containing a corresponding tracker code to each target tracker in each tracker group, so that each target tracker performs a corresponding action according to the received preset action instruction, wherein the execution actions carried by each preset action instruction sent to the same tracker group are different.

15. A photovoltaic tracking system, characterized in that: include: A photovoltaic module, a tracker, an inverter and a controller, wherein the controller comprises the matching device according to any one of claims 11 to 14; The controller is communicatively connected to the tracker and the inverter respectively. The tracker is connected to at least one photovoltaic module via a mechanical structure. At least one photovoltaic module is connected to the DC side of the inverter.

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