Networking and data acquisition method of photovoltaic module-level power electronic equipment based on HPLC communication

Abstract

This invention discloses a networking and data acquisition method for photovoltaic module-level power electronic devices based on HPLC communication. The system includes a data acquisition unit and multiple HPLC communication modules connected to the acquisition unit. Each module is connected to the photovoltaic module-level power electronic devices via magnetic ring coupling. The method includes: the data acquisition unit receiving a MAC list from a server, writing the MAC addresses of each photovoltaic module-level power electronic device into the whitelist of the corresponding module according to the binding relationship; and controlling each module to only perform network binding and data acquisition with the photovoltaic module-level power electronic devices in the whitelist. This invention achieves logical isolation of the access range of each module through a whitelist mechanism, solving the signal crosstalk problem when multiple strings are wired in the same slot. At the same time, a single acquisition unit drives multiple modules, reducing hardware costs and balancing network controllability and deployment economy.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic power generation system monitoring technology, specifically to a networking and data acquisition method for photovoltaic module-level power electronic equipment based on high-speed power line carrier (HPLC) communication. Background Technology

[0002] In photovoltaic power plants, it is usually necessary to collect data on the operating parameters (such as voltage, current, power, etc.) of multiple photovoltaic strings in order to achieve condition monitoring and fault diagnosis.

[0003] In existing technologies, the data acquisition schemes for photovoltaic strings mainly suffer from the following problems: First, the wiring of multiple photovoltaic strings is usually laid in the same cable tray, and the distance between the lines is relatively short. When each string transmits signals via its own magnetic ring coupled with HPLC signals, crosstalk can easily occur between different magnetic rings through spatial coupling or line coupling, leading to degraded communication quality and inaccurate data acquisition.

[0004] Secondly, in traditional solutions, each photovoltaic string needs to be equipped with an independent data acquisition device, which results in high hardware costs when data from multiple strings needs to be collected.

[0005] Third, data acquisition units and optimizers generally establish communication connections using a self-organizing network. While the self-organizing network method offers flexible configuration, it cannot effectively control the access range of communication modules in scenarios with multiple magnetic rings in the same slot. This can easily lead to optimizers under adjacent magnetic rings being networked together, resulting in chaotic network relationships and a lack of a management mechanism that can achieve precise device binding and communication isolation.

[0006] Therefore, it is necessary to provide a data acquisition system and method that can solve crosstalk between multiple serial signals, has low hardware cost, and allows for network control. Summary of the Invention

[0007] The present invention aims to provide a networking and data acquisition method for photovoltaic module-level power electronic equipment based on HPLC communication, so as to solve the problems of crosstalk of multi-channel string signals, high hardware cost and uncontrollable networking relationship in the prior art.

[0008] A photovoltaic string data acquisition method based on HPLC communication is applied to a data acquisition device. The data acquisition device is connected to multiple HPLC communication modules, and each HPLC communication module is connected to a group of photovoltaic module-level power electronic devices via magnetic ring coupling. The method includes: The receiver sends a Media Access Control (MAC) list from the server. The MAC list contains the binding relationship between each HPLC communication module and the corresponding device MAC address. Write each MAC address into the whitelist of the corresponding HPLC communication module; Control each HPLC communication module to form a network binding with photovoltaic module-level power electronic devices in their respective whitelists; After successful network setup, each HPLC communication module sends a data read request to the bound photovoltaic module-level power electronic equipment and receives the returned collected data.

[0009] Compared with the prior art, the present invention has the following beneficial effects: To avoid crosstalk and misconnection: The magnetic ring of this invention serves only as a signal coupling channel and does not rely on physical spatial wiring isolation; by establishing and executing a MAC whitelist filtering mechanism at the software logic layer, strict logical isolation of the access range of each module is achieved. Even if spatial coupling occurs due to multi-channel string wiring in the same slot, the whitelist mechanism can effectively filter irrelevant signals, ensuring that each module is precisely bound only to photovoltaic module-level power electronic devices within the whitelist, thus fundamentally solving the problem of data acquisition errors and misconnection caused by signal crosstalk; Reduced costs: One data acquisition unit can connect to multiple HPLC communication modules, eliminating the need to configure a separate acquisition unit for each string, significantly reducing hardware costs; Controllable networking: The MAC whitelist enables precise binding of photovoltaic module-level power electronic devices and modules, avoiding misconnection in self-organizing mode, supporting remote configuration, and facilitating expansion and maintenance; High compatibility: No limit on the number of modules or strings, suitable for photovoltaic power plants of various sizes. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the system described in an embodiment of the present invention.

[0011] Figure 2 This is a network topology diagram of the system described in an embodiment of the present invention.

[0012] Figure 3 This is a flowchart illustrating the networking and data acquisition process described in an embodiment of the present invention. Detailed Implementation

[0013] (Refer to the attached diagram) Figure 1 and Figure 2 The preferred embodiments of the present invention will be described in detail below. Figure 1 This is a schematic diagram of the overall architecture of the system of the present invention; Figure 2 This is a network topology example diagram of the present invention in a specific application scenario.

[0014] This embodiment provides a networking and data acquisition method for photovoltaic module-level power electronic devices based on HPLC communication, applicable to... Figure 1 The system shown includes a server, a data acquisition unit, and photovoltaic module-level power electronics connected via an HPLC network.

[0015] like Figure 2 As shown, in a specific application scenario of this embodiment, the data acquisition unit is connected to four HPLC communication modules. Each HPLC communication module is coupled to the corresponding photovoltaic module-level power electronic device through a magnetic ring. Each magnetic ring is physically threaded through the DC cable of one or more photovoltaic strings to achieve signal coupling and isolation. The DC cables of multiple photovoltaic strings are laid together in the same string cable tray. In this example, each photovoltaic string is composed of multiple photovoltaic optimizers connected in series (for example, each string contains 20 optimizers). It should be noted that the specific number in this embodiment (such as 4 modules, with the magnetic ring of each module threaded through 5 photovoltaic strings, for a total of 20 strings) is only an example and not a limitation of the present invention. The system architecture described in this invention has good scalability and can support the networking and data acquisition needs of large-scale photovoltaic power plants.

[0016] Based on the above system architecture, the data acquisition and networking method provided in this embodiment refers to... Figure 3 The method includes the following steps: Step S301: MAC list distribution and whitelist configuration.

[0017] The server generates a MAC address list for each photovoltaic module-level power electronic device based on the wiring topology of the photovoltaic power station and sends this list to the data acquisition unit. Upon receiving the MAC address list, the data acquisition unit divides it into multiple groups and stores them separately, with each group corresponding to an HPLC communication module. Subsequently, based on the device-module binding relationship, the data acquisition unit writes the MAC addresses within each group into the whitelist of the corresponding HPLC communication module.

[0018] Step S302: Polling network based on whitelist.

[0019] The data acquisition unit controls each HPLC communication module to actively initiate a network connection request. Because each communication module's whitelist limits the set of MAC addresses it is allowed to communicate with, during the network connection process, each HPLC communication module can only handshake and network-bind with the target photovoltaic module-level power electronic devices bound to its whitelist. This step, through software logic-level whitelist filtering, effectively achieves logical isolation of each magnetic ring access area. Even in scenarios with multiple strings wired in the same slot and electromagnetic coupling between cables, it ensures that the HPLC module will not mistakenly connect to photovoltaic module-level power electronic devices in adjacent strings.

[0020] Step S303: Data collection and reporting.

[0021] After successful network setup, the data acquisition unit sends data read requests to its bound photovoltaic module-level power electronic devices (such as photovoltaic optimizers) via each HPLC communication module. The target devices respond to the requests, returning operating parameters (voltage, current, etc.) to the corresponding HPLC module via the HPLC communication link, which is then aggregated to the data acquisition unit. Finally, the data acquisition unit reports all aggregated data to the server for status monitoring and fault diagnosis in the background.

[0022] Effects of the Implementation Examples Please refer to the beneficial effects of this invention. In traditional solutions, signal crosstalk is easily generated between magnetic rings when multiple strings are wired in the same slot, and misconfiguration of photovoltaic module-level power electronic equipment is also prone to occur. However, this invention combines "magnetic ring signal coupling at the hardware level" with "MAC whitelist filtering and binding at the software level," which solves the signal interference problem on the one hand and achieves precise control of data acquisition on the other.

[0023] Meanwhile, unlike existing technologies where each string must be configured with an independent data acquisition unit, this invention adopts an architecture where a single data acquisition unit drives multiple HPLC modules. By rationally allocating whitelists, it effectively reduces the hardware deployment cost of large-scale photovoltaic power plants, while taking into account both network controllability and deployment economy.

[0024] When the string topology of a photovoltaic power station changes, the server only needs to reissue the updated MAC address whitelist, and the data acquisition unit can synchronously update the whitelist of the corresponding HPLC module without physical rewiring.

[0025] Optional embodiments Those skilled in the art will understand that the present invention is not limited to the specific implementations described above, for example: The photovoltaic module-level power electronic equipment can be a photovoltaic optimizer, a photovoltaic shut-off device, a smart junction box, or other photovoltaic module-level power electronic equipment.

[0026] The MAC list grouping strategy of the data acquisition device can be flexibly adjusted according to the actual number of photovoltaic module-level power electronic devices in the photovoltaic power station, and the number of modules can be expanded according to the number of strings.

[0027] The number of cables to be run can be determined by the number of strings in the actual cable tray, as long as the coupling requirements of the HPLC signal are met.

Claims

1. A networking and data acquisition method for photovoltaic module-level power electronic equipment based on HPLC communication, characterized in that, Includes the following steps: Whitelist configuration steps: The server sends the MAC list of each photovoltaic module-level power electronic device to the data acquisition device. The data acquisition device divides the MAC list into multiple groups and stores them separately. Each group corresponds to an HPLC communication module, and the MAC address in each group is written into the corresponding HPLC communication module. Polling networking steps: The data acquisition device controls each HPLC communication module to filter responses based only on the MAC addresses in their respective whitelists during the handshake protocol and networking process, and only binds the corresponding photovoltaic module-level power electronic equipment to the network. Data acquisition steps: After successful network setup, the data acquisition device sends data read requests to the corresponding photovoltaic module-level power electronic equipment through each HPLC communication module, and receives the acquired data returned by the photovoltaic module-level power electronic equipment.

2. The method according to claim 1, characterized in that, The data acquisition device is connected to multiple HPLC communication modules.

3. The method according to claim 2, characterized in that, Each of the HPLC communication modules is connected to a signal coupling element, which is connected to one or more photovoltaic strings via cables to achieve HPLC signal coupling and isolation.

4. The method according to claim 1, characterized in that, The whitelist is used to limit the set of MAC addresses that each HPLC communication module is allowed to communicate with.

5. The method according to claim 1, characterized in that, The data acquisition device aggregates the data collected through each HPLC communication module and reports it to the server.

6. A data acquisition device, comprising a processor and a storage unit, characterized in that, The storage unit stores a program, and when the processor executes the program, it implements the steps of the method as described in any one of claims 1 to 5.

7. A storage medium, characterized in that, It stores a program that, when executed by a processor, implements the steps of the method as described in any one of claims 1 to 5.

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