Battery pack physical position identification device and method, and photovoltaic power station opening addressing method

Abstract

The application relates to a battery pack physical position recognition device and method and a photovoltaic power station starting addressing method, wherein the battery pack physical position recognition device and method simplify the physical architecture for battery pack physical position recognition, realize address automatic allocation through a special address bus, have higher processing efficiency and treatment reliability compared with the traditional address allocation through a physical dial code switch or manual calibration of the battery pack address, can effectively improve the installation efficiency of the battery pack and even the photovoltaic power station, and further trigger the battery pack physical position recognition when performing a starting operation, realize automatic starting of the battery pack and position recognition, reduce user operation at the starting stage, and execute the battery pack physical position recognition and photovoltaic power station configuration starting parameter operation in parallel, so that the starting time can be effectively shortened, and user experience is improved.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic control technology, and more particularly to the field of photovoltaic power plant management technology, specifically to a battery pack physical location identification device and method, and a photovoltaic power plant start-up addressing method. Background Technology

[0002] A photovoltaic (PV) power station is a power generation system that utilizes solar energy, employs solar panels made of special materials such as crystalline silicon, inverters, and other electronic components, and can be connected to the power grid for bidirectional power transmission. PV power stations are among the green energy development projects most strongly encouraged by the state. During operation, the solar panels generate direct current (DC) and convert it into alternating current (AC), which is then used in household or business power systems. When the power generation of the solar energy storage device exceeds the load demand, the PV system stores the excess energy in the storage device. When sunlight is insufficient or the load demand exceeds the PV system's power generation capacity, the energy storage device takes over the power supply to maintain the normal operation of the load.

[0003] Energy storage devices generally include at least one battery pack. To facilitate the management and maintenance of each battery pack, it is necessary to quickly locate the physical position of the battery packs in the photovoltaic power plant's energy storage device. The current main method involves adding a DIP switch connected to an internal controller at the location of each battery pack. By adjusting the number of bits in the DIP switch, the physical position of each controller is set using binary encoding. However, this method requires individual settings for each battery pack controller, resulting in a high error rate and low efficiency. Additionally, some methods for automatically determining the physical position of battery packs have emerged, but these methods are complex, and even after the physical position of the battery pack is identified and determined, the installation of the terminal matching resistor still requires manual installation, further reducing installation efficiency. Summary of the Invention

[0004] A primary objective of this invention is to overcome at least one of the aforementioned deficiencies and to provide a battery pack physical location identification device that has a simple overall structure, low implementation cost, and can effectively improve the efficiency of battery pack physical location identification.

[0005] Another major objective of this invention is to overcome at least one of the above-mentioned defects and to provide a battery pack physical location identification method that can automatically calibrate the physical location of the battery pack, improve identification efficiency, and effectively enhance the reliability of battery pack physical location identification.

[0006] Another major objective of this invention is to overcome at least one of the above-mentioned defects and to provide a photovoltaic power station start-up addressing method that can automatically calibrate the physical location of the battery pack while the photovoltaic power station is being started up, thereby improving identification efficiency, shortening the photovoltaic power station start-up time, and enhancing the user experience.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0008] This invention provides a battery pack physical location identification device for a photovoltaic power station with photovoltaic energy storage equipment. The energy storage equipment includes several battery packs, and the photovoltaic power station includes an inverter. The battery pack physical location identification device includes a main controller, wherein:

[0009] The battery packs are electrically connected to the inverter via power lines, and the battery packs and the inverter are connected via address calibration lines, which are used to transmit physical location identification signals. The main controller is connected to the inverter and each battery pack via a communication bus.

[0010] According to one embodiment of the present invention, the battery packs are connected in parallel sequentially via power lines, and the address configuration interfaces of each battery pack are connected sequentially via address calibration lines.

[0011] According to one embodiment of the present invention, the battery packs are connected in parallel sequentially via power lines, and each battery pack is provided with a battery controller, and the digital interfaces of each battery controller are connected sequentially via address calibration lines.

[0012] According to one embodiment of the present invention, the inverter is electrically connected to at least one of the plurality of battery packs via a power line, the inverter has an inverter controller, and the digital interface of the inverter controller is connected to the digital interface of the battery pack connected to the inverter via an address calibration line.

[0013] According to one embodiment of the present invention, the main controller is communicatively connected to the inverter controller and each battery controller via a communication bus.

[0014] According to one embodiment of the present invention, the battery controller has at least one set of digital interfaces, which are connected to the digital interfaces of two battery controllers via the address calibration line, for sequentially connecting the plurality of battery packs.

[0015] According to one embodiment of the present invention, in the plurality of battery packs connected in sequence, the digital input interface of the battery controller of the battery pack located at the end is connected to the digital output interface of the inverter via an address calibration line.

[0016] According to one embodiment of the present invention, each set of digital interfaces includes a digital input interface and a digital output interface. In the plurality of battery packs connected in sequence, the digital input interface of one battery pack is connected to the digital output interface of the preceding battery pack through an address calibration line, and the digital output interface of one battery pack is connected to the digital input interface of the following battery pack through an address calibration line.

[0017] According to one embodiment of the present invention, each battery pack is provided with a terminal matching resistor and an electronic control switch, and the terminal matching resistor and the electronic control switch are connected in series and then connected in parallel to the communication bus.

[0018] According to one embodiment of the present invention, each battery pack is provided with an electrically controllable start switch, and the main controller is connected to each start switch via an auxiliary power control line to start the battery pack.

[0019] According to one embodiment of the present invention, the main controller is an inverter controller of an inverter, and the inverter controller is connected to each battery controller via a communication bus.

[0020] According to one embodiment of the present invention, the communication bus is an RS485 bus or a CAN bus.

[0021] In particular, the present invention also provides a method for identifying the physical location of a battery pack, based on the battery pack physical location identification device described above, characterized by comprising the following steps:

[0022] Step S1: The main controller sends a device search start command to the inverter;

[0023] Step S2: After receiving the device search command, the inverter sends an initial physical location identification signal to the nth battery pack connected to it;

[0024] Step S3: The nth battery pack determines its initial position based on the initial physical position identification signal sent by the inverter, and sends an intermediate physical position identification signal to the (n+1)th battery pack connected to it.

[0025] Step S4: The (n+1)th battery pack connected to the nth battery pack determines its own physical position according to the intermediate physical position identification signal, and the (n+1)th battery pack continues to send the intermediate physical position identification signal to the (n+2)th battery pack connected to it to determine the physical position of the (n+2)th battery pack, where n is an integer greater than or equal to 1.

[0026] According to one embodiment of the present invention, the method further includes step S5: after all battery packs have completed physical location identification, the main controller sends a termination resistor closing trigger signal to the battery pack that has finally confirmed its physical location via the communication bus. Upon receiving the termination resistor closing trigger signal, the battery pack that has finally confirmed its physical location closes the electronic control switch inside the battery pack. The communication bus is connected to the termination matching resistor at the end.

[0027] According to one embodiment of the present invention, the terminating matching resistor at the beginning of the communication bus is located in the main controller.

[0028] According to one embodiment of the present invention, in step S1, the main controller also sends a black start signal to the start switch in the battery pack through the auxiliary power control line. After receiving the black start signal, the start switch in the battery pack closes the power supply of the battery controller to complete the power-on of the battery pack.

[0029] According to one embodiment of the present invention, the main controller assigns a virtual address to each battery pack via a communication bus, and the main controller maintains communication with the battery pack that has completed the virtual address assignment in order to obtain the number of battery packs.

[0030] According to one embodiment of the present invention, a battery pack that has obtained a virtual address reports its current physical location through a communication bus. If the battery pack has not yet been assigned a physical location, it reports an invalid physical location to detect the completion rate of the battery pack's physical location identification.

[0031] According to one embodiment of the present invention, the physical location intermediate identification signal is a square wave signal, and the battery pack determines its own physical location based on the frequency or duty cycle of the received physical location intermediate identification signal.

[0032] In particular, the present invention also provides a photovoltaic power station start-up addressing method, which issues a photovoltaic start-up command and performs start-up configuration through a terminal. At the same time as issuing the start-up command, the physical location of the battery pack is automatically searched and determined. The process of searching and determining the physical location of the battery pack adopts the battery pack physical location identification method described above.

[0033] According to one embodiment of the present invention, after the physical location of the battery pack is searched and determined, the physical location of each battery pack is reported to the main controller via the CAN bus.

[0034] Compared with existing technologies, the advantages and beneficial effects of the battery pack physical location identification device and method and the photovoltaic power station start-up addressing method of this patent application are as follows:

[0035] The battery pack physical location identification device and method of this application simplify the physical architecture for battery pack physical location identification. It achieves automatic address allocation through a dedicated address bus. Compared with the traditional method of identifying battery pack addresses through physical DIP switches or manual calibration, it has higher processing efficiency and reliability, and can effectively improve the installation efficiency of battery packs and even photovoltaic power plants.

[0036] Furthermore, each battery pack is equipped with a terminating resistor. After all battery packs have completed physical location identification, the terminating resistor at the tail battery pack is closed via the CAN bus, thereby realizing the automated configuration of the CAN bus matching resistor, ensuring the reliability of CAN bus communication, and eliminating the need for the traditional manual installation of the last terminating resistor, thus making the installation more efficient.

[0037] In addition, the photovoltaic power station start-up addressing method of this application triggers the identification of the physical location of the battery pack when performing the start-up operation, realizing automatic start-up and location identification of the battery pack, reducing user operations at the start-up, and the operation of battery pack physical location identification and photovoltaic power station configuration start-up parameters are executed in parallel, which can effectively shorten the start-up time and improve the user experience. Attached Figure Description

[0038] The following sections will describe some specific embodiments of the invention in detail by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or portions. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:

[0039] Figure 1 This is a circuit structure block diagram of a battery pack physical location identification device according to an embodiment of the present invention;

[0040] Figure 2 This is a circuit structure block diagram of a battery pack physical location identification device according to another embodiment of the present invention;

[0041] Figure 3 This is a schematic diagram of the main controller side of a battery pack physical location identification method according to an embodiment of the present invention;

[0042] Figure 4 This is a schematic diagram of the inverter-side operation of a battery pack physical location identification method according to an embodiment of the present invention.

[0043] Figure 5 This is a schematic diagram of the working process of a battery pack physical location identification method according to an embodiment of the present invention on the battery pack side.

[0044] Figure 6 This is a schematic diagram illustrating the workflow of a photovoltaic power plant start-up addressing method according to an embodiment of the present invention.

[0045] The attached figures are labeled as follows:

[0046] 1. Main controller; 2. Inverter; 31. First battery pack; 32. Second battery pack; 33. Third battery pack; 4. Battery controller; 51. First terminal matching resistor; 52. Second terminal matching resistor; 53. Electronic control switch. Detailed Implementation

[0047] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0048] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0049] Example 1:

[0050] This embodiment describes a battery pack physical location identification device for use in a photovoltaic power station with photovoltaic and energy storage equipment, such as... Figure 1 As shown, the energy storage device includes several battery packs, the photovoltaic power station includes an inverter 2, and the battery pack physical location identification device includes a main controller 1. The battery packs are connected in parallel sequentially via power lines. Each battery pack is equipped with a battery controller 4 for information processing and control. The battery controllers 4 are connected to each other via a communication bus, and their digital interfaces are sequentially connected via address calibration lines. The inverter 2 is electrically connected to one of the battery packs via power lines. The inverter 2 contains an inverter controller, and its digital interface is connected to the digital interface of the battery controller 4 of the battery pack connected to the inverter via address calibration lines. The main controller 1 is connected to the inverter controller and each battery controller 4 via a communication bus.

[0051] The main controller 1 can send control commands to the inverter 2 via the CAN bus. After processing the commands, the inverter controller in the inverter 2 can send commands to the connected battery packs to enable physical location identification. Then, each battery pack will determine its own physical location one by one.

[0052] In a preferred embodiment, the positive and negative terminals of each battery pack are connected in parallel sequentially via power lines, and the digital interfaces of each battery pack are sequentially connected one by one via address calibration lines. The sequentially connected battery packs are arranged in an ordered series, with the battery pack at the end (first end) connected to the digital interface of inverter 2 via address calibration lines. It should be noted that the digital interfaces refer to the digital interfaces of the inverter and the controllers in each battery pack. For clarity, this document may sometimes directly refer to the digital interface of a specific unit, such as "digital interface of inverter 2" above, which refers to the digital interface of the inverter controller of inverter 2.

[0053] Specifically, the battery controller 4 provided in each of the battery packs has a set of digital interfaces, which are the digital interfaces of the battery controller 4. Each set of digital interfaces includes a digital input interface and a digital output interface.

[0054] For ease of description of the battery pack physical location identification device, the battery pack 1 connected to the inverter 2 is named the first battery pack 31, the battery pack N at the end is named the second battery pack 32, and the battery packs (battery pack 2, battery pack 3, ... battery pack N-1) located between the first battery pack 31 and the second battery pack 32 are named the third battery pack 33. Figure 1 As shown, Figure 1 This illustration demonstrates a specific implementation of the present invention and does not limit the scope of protection of the invention in any way. N is a positive integer greater than or equal to N. Specifically:

[0055] When the inverter 2 is connected to the digital interface of the first battery pack 31 at the beginning, the digital output interface of the inverter 2 is connected to the digital input interface of the first battery pack 31 through the address calibration line.

[0056] When the digital interface of the first battery pack 31 and the third battery pack 33 is connected, the digital output interface of the first battery pack 31 is connected to the digital input interface of the third battery pack 33 through the address calibration line.

[0057] When docking the digital interface of the third battery pack 33 with the second battery pack 32 at the tail end, the digital output interface of the third battery pack 33 is connected to the digital input interface of the second battery pack 32 through the address calibration line.

[0058] When docking the digital interface of the third battery pack 33, the digital input interface of the third battery pack 33 is sequentially connected to the digital output interface of the previous battery pack through the address calibration line, and the digital output interface of the third battery pack 33 is sequentially connected to the digital input interface of the next battery pack through the address calibration line.

[0059] Typically, each battery pack contains a controller unit, namely the aforementioned battery controller 4, which has the aforementioned digital interface. Alternatively, for physical location identification processing, a separate controller can be provided in each battery pack, instead of using the aforementioned battery controller 4 for control processing within the battery pack. The applicant believes that both the battery controller 4 present in each battery pack and a separate controller for physical location identification processing should be within the scope of protection of this application.

[0060] The communication bus can be either an RS485 bus or a CAN bus; either can be selected in this embodiment. For reliable communication, terminating resistors are typically installed at both the beginning and end of the communication bus.

[0061] In this embodiment, the CAN bus is used as an example. In CAN communication, the matching resistors are usually set at both ends of the CAN bus, called bus terminals, or commonly known as terminating matching resistors. The purpose of the terminating matching resistor is to help reduce signal reflection and interference, so as to ensure that the signal can flow correctly through the CAN bus. Therefore, the first terminating matching resistor 51 at the beginning of the CAN bus is located at the main controller 1 and is in a closed state, while the second terminating matching resistor 52 is kept closed and set in the battery pack at the end. Traditionally, the second terminating matching resistor 52 at the battery pack is manually installed at the end of the battery pack after the physical location is allocated, and then closed to complete the reliable setting of the CAN bus.

[0062] In one embodiment of this application, a second terminating resistor 52 and an electronic control switch 53 are respectively configured in each battery pack. The terminating resistor 52 and the electronic control switch 53 are connected in series and then connected in parallel. After the physical position of the battery pack is identified, the position information is reported. At the same time, the battery pack at the tail end (the aforementioned second battery pack 32) closes the electronic control switch connected to the second terminating resistor 52 inside it, and connects the second terminating resistor 52 of the last battery pack to the tail end of the CAN bus. In this way, the correct configuration of the terminating resistor of the CAN bus is automatically completed, and reliable signal transmission of CAN bus communication is realized.

[0063] In addition, the main controller 1 is connected to the start switch in each battery pack via the auxiliary power control line. The main controller 1 is connected to each start switch via the auxiliary power control line. The main controller 1 can issue control commands, such as black start signals, to each battery pack via the auxiliary power control line to complete the black start power-on of the battery pack.

[0064] Example 2:

[0065] The overall architecture of the battery pack physical location identification device in this embodiment is an improvement upon that of Embodiment 1. The improvement lies in the fact that a separate main controller is no longer required; instead, the inverter controller in inverter 2 is used to issue control commands and initial physical location identification commands, thus simplifying the overall architecture. Specifically, the inverter controller is connected to each battery controller 4 via a communication bus, and the first terminal matching resistor 51 is located within inverter 2. Furthermore, inverter 2 is connected to the start switch in each battery pack via an auxiliary power control line. Inverter 2 can issue control commands, such as a black start signal, to each battery pack via the auxiliary power control line to complete the black start power-on of the battery pack.

[0066] Example 3:

[0067] This embodiment describes a method for identifying the physical location of a battery pack, based on the battery pack physical location identification device as described in Embodiment 1 or Embodiment 2, which includes the following steps:

[0068] Step S1: The main controller 1 sends a device search start command to the inverter 2;

[0069] Step S2: After receiving the device search command, inverter 2 sends an initial physical location identification signal to the first battery pack 31 connected to it;

[0070] Step S3: The first battery pack 31 determines its initial position based on the initial physical position identification signal sent by the inverter 2, and sends an intermediate physical position identification signal to the third battery pack 33 connected to it.

[0071] Step S4: The third battery pack 33 determines its own physical position according to the intermediate physical position identification signal, and the third battery pack 33 continues to send the intermediate physical position identification signal to the other battery pack connected to it, and determines the physical position of the battery packs in turn until the search reaches the end battery pack (i.e. the second battery pack 32), thus completing the physical position identification of all battery packs.

[0072] The following details the processing logic of the battery pack physical location identification method on the main controller 1 side, inverter 2 side, and battery pack side:

[0073] On the main controller 1 side, such as Figure 3As shown, upon receiving a start device search command from an external source, the main controller 1 sends a start device search command to the inverter 2 and sends a black start signal to the battery pack via the auxiliary power control line. The start switch in the battery pack receives the black start signal and closes, thus powering on the battery pack. For black start of the battery pack, it can be initiated by a command from the main controller 1 or manually controlled on-site, depending on the specific circumstances. The physical identification of the battery pack continues even when it is powered on and running. After sending the battery pack black start signal, hold for time T1 and then turn off the black start signal to ensure successful black start signal transmission and successful startup of each battery pack. However, T1 should not be set for too long to prevent prolonged hard starts that could prevent the battery packs from entering sleep mode and causing them to lose power. Then, after time T2, check whether the device search is complete. This is determined by the feedback from the battery packs on their physical locations, thereby detecting the number of battery packs and the completion rate of physical location identification. If the search is not completed, continue to check whether time T3 has been reached. If time T3 has been reached, the device search ends, i.e., the physical location identification of the battery packs ends. If time T3 has not been reached, return to the step of checking whether the device search is complete. T3 is a timeout setting, which is the maximum time to ensure that the physical location identification can be completed normally, to prevent failure to exit the physical location identification state and affect the subsequent station opening process.

[0074] For the settings of the three times T1, T2, and T3, the timing of these three times starts from the same etching, and the starting time of the timing begins after receiving the device search command. Generally, it is set to T1 < T2 < T3. In this embodiment, T1 is set to 5 seconds, T2 is set to 30 seconds, and T3 is set to 60 seconds.

[0075] The feedback process of the battery packs' physical location involves the main controller assigning a virtual address to each battery pack via the communication bus. The main controller maintains communication with the battery packs that have completed virtual address assignment to obtain the number of battery packs, thus enabling the counting of battery packs. Battery packs that have obtained virtual addresses report their current physical location via the communication bus. If a battery pack has not yet been assigned a physical location, it reports an invalid physical location, which is used to check the completion rate of battery pack physical location identification.

[0076] On inverter 2 side, such as Figure 4As shown, after receiving the device search start command from the main controller 1, the inverter 2 sends an initial physical location identification signal to the first battery pack 31 connected to it, initiating the physical location identification action of the battery pack. Then, each battery pack identifies and determines its own physical location one by one. After each battery pack determines its own location, it not only continues to send down intermediate physical location identification signals, but also uploads its own physical location back to the inverter 2. The inverter 2 counts the number of battery packs that have completed physical location identification. When the battery pack requirements of the photovoltaic power station are met, it indicates that the physical location identification is over. The inverter 2 reports the completion of physical location identification to the main controller 1 through the CAN bus, and at the same time reports the physical location of each battery pack and the number of battery packs.

[0077] On the battery pack side, such as Figure 5 As shown, after receiving the black start signal from the main controller 1 via the auxiliary power control line, the battery pack automatically completes the startup and initialization of the battery pack, and then waits to receive the initial physical position identification signal from the inverter 2 connected to it or the intermediate physical position identification signal from the previous battery pack. It determines its own physical position based on the received position identification data and feeds back the position identification data to the inverter 2 during this process to determine whether the position identification has ended. If it has not ended, it continues to send the intermediate physical position identification signal down until it determines that the position identification has ended and the physical position of the last battery pack, that is, the physical position of the second battery pack 32, is determined.

[0078] In one embodiment, the battery pack physical location identification method further includes step S5: after all battery packs have completed physical location identification, the main controller 1 sends a termination resistor closing trigger signal to the battery pack that has last confirmed its physical location via the CAN bus. Upon receiving the termination resistor closing trigger signal, the battery pack that has last confirmed its physical location closes the electronic control switch connected to the termination matching resistor in the battery pack, and connects the termination matching resistor in the second battery pack 32 to the CAN bus. In this way, the correct configuration of the termination matching resistor of the CAN bus is automatically completed, and reliable signal transmission of CAN bus communication is realized.

[0079] The intermediate physical location identification signal is a square wave signal. The battery pack determines its physical location based on the duty cycle of the received intermediate physical location identification signal. In other words, the duty cycle of the signal transmitted changes proportionally each time the intermediate physical location identification signal is transmitted again via a battery pack. In a photovoltaic power station with four battery packs, including a first battery pack 31, a second battery pack 32, and two third battery packs 33 located at the first battery pack 31 and the second battery pack 32, the duty cycle of the physical location intermediate identification signal sent by the first battery pack 31 to the third battery pack 33 connected to it is 5%. The duty cycle of the physical location intermediate identification signal sent by this third battery pack 33 to the other third battery pack 33 connected to it is 15%. The duty cycle of the physical location intermediate identification signal sent by the other third battery pack 33 to the second battery pack 32 connected to it is 25%. As for the physical location intermediate identification signal output by the last second battery pack 32, the duty cycle is 35%. And the second battery pack 32 feeds back the physical location intermediate identification signal with a duty cycle of 35% to the inverter 2. It can be concluded that the second battery pack 32 is the last battery pack, and the battery pack position identification ends.

[0080] The intermediate physical location identification signal is a square wave signal. The battery pack determines its physical location based on the frequency of the received intermediate physical location identification signal. In other words, the frequency of the signal transmitted each time the intermediate physical location identification signal is transmitted again via a battery pack changes proportionally. In a photovoltaic power station with four battery packs, including a first battery pack 31, a second battery pack 32, and two third battery packs 33 located at the first battery pack 31 and the second battery pack 32, the physical location intermediate identification signal sent by the first battery pack 31 to the third battery pack 33 connected to it has a frequency of 6Hz. The physical location intermediate identification signal sent by this third battery pack 33 to the other third battery pack 33 connected to it has a frequency of 8Hz. The physical location intermediate identification signal sent by the other third battery pack 33 to the second battery pack 32 connected to it has a frequency of 10Hz. As for the physical location intermediate identification signal output by the last second battery pack 32, it has a frequency of 12Hz. The second battery pack 32 feeds back the physical location intermediate identification signal with a frequency of 12Hz to the inverter 2. It can be concluded that the second battery pack 32 is the last battery pack, and the battery pack position identification ends.

[0081] The battery pack physical location identification device and method of this embodiment simplifies the physical architecture for battery pack physical location identification. It achieves automatic address allocation through a dedicated address bus, which has higher processing efficiency and reliability compared with the traditional method of using physical DIP switches or manually calibrating battery pack addresses. It can effectively improve the installation efficiency of battery packs and even photovoltaic power plants.

[0082] Example 4:

[0083] This embodiment describes a photovoltaic power plant site selection method, which optimizes and improves upon the aforementioned embodiments, such as... Figure 6 As shown, the optimizations include: shortening the photovoltaic power station startup time; issuing startup commands and configuring the system via an APP terminal; simultaneously sending a device search command to the main controller 1 and monitoring the device search progress until completion; and automatically searching and determining the physical location of the battery packs while the user sets basic startup parameters via the APP terminal, using the battery pack physical location identification method described in Example 3.

[0084] The photovoltaic power station start-up addressing method in this embodiment triggers the physical location identification of the battery pack when performing the start-up operation, realizing automatic start-up and location identification of the battery pack, reducing user operations at the start-up. The physical location identification of the battery pack and the configuration of start-up parameters of the photovoltaic power station are performed in parallel, which can effectively shorten the start-up time and improve the user experience.

[0085] In one implementation, after the physical location of the battery pack is searched and determined, the physical location of each battery pack is reported to the main controller 1 via the CAN bus, and then the main controller 1 feeds back to the cloud or sends it directly to the APP terminal.

[0086] The above embodiments are only for illustrating the technical concept and features of the present invention. Their purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be used to limit the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A battery pack physical location identification device for use in a photovoltaic power station with energy storage equipment, characterized in that, The energy storage device includes several battery packs, the photovoltaic power station includes an inverter, and the battery pack physical location identification device includes a main controller, wherein: The battery packs are electrically connected to the inverter via power lines, and the battery packs and the inverter are connected via address calibration lines. The address calibration lines are used to transmit physical location identification signals. The address configuration interfaces of each battery pack are sequentially connected via address calibration lines. The main controller communicates with the inverter and each battery pack via a communication bus. Each battery pack is equipped with a terminal matching resistor and an electronic control switch. The terminal matching resistor and the electronic control switch are connected in series and then connected in parallel to the communication bus. After all battery packs have completed physical location identification, the main controller sends a termination resistor closing trigger signal to the battery pack that has last confirmed its physical location via the communication bus. Upon receiving the termination resistor closing trigger signal, the battery pack that has last confirmed its physical location closes the electronic control switch inside the battery pack. The communication bus is connected to the termination matching resistor at the end.

2. The battery pack physical location identification device according to claim 1, characterized in that, The battery packs are connected in parallel sequentially via power lines.

3. The battery pack physical location identification device according to claim 2, characterized in that, The battery packs are connected in parallel sequentially via power lines. Each battery pack is equipped with a battery controller, and the digital interfaces of each battery controller are connected sequentially via address calibration lines.

4. The battery pack physical location identification device according to claim 3, characterized in that, The inverter is electrically connected to at least one of the plurality of battery packs via a power line. The inverter has an inverter controller, and the digital interface of the inverter controller is connected to the digital interface of the battery pack connected to the inverter via an address calibration line.

5. The battery pack physical location identification device according to claim 4, characterized in that, The main controller is connected to the inverter controller and each battery controller via a communication bus.

6. The battery pack physical location identification device according to claim 5, characterized in that, The battery controller has at least one set of digital interfaces, which are connected to the digital interfaces of two battery controllers via the address calibration line, for sequentially connecting the plurality of battery packs.

7. The battery pack physical location identification device according to claim 6, characterized in that, In the sequentially connected battery packs, the digital input interface of the battery controller of the battery pack located at the end is connected to the digital output interface of the inverter via an address calibration line.

8. The battery pack physical location identification device according to claim 6 or 7, characterized in that, Each set of digital interfaces includes a digital input interface and a digital output interface. In the sequentially connected battery packs, the digital input interface of one battery pack is connected to the digital output interface of the preceding battery pack via an address calibration line, and the digital output interface of one battery pack is connected to the digital input interface of the following battery pack via an address calibration line.

9. The battery pack physical location identification device according to claim 1, characterized in that, Each battery pack is equipped with an electrically controllable start switch, and the main controller is connected to each start switch via an auxiliary power control line to start the battery pack.

10. The battery pack physical location identification device according to claim 1, characterized in that, The main controller is an inverter controller of the inverter, which communicates with each battery controller via a communication bus.

11. The battery pack physical location identification device according to claim 1, characterized in that, The communication bus is either an RS485 bus or a CAN bus.

12. A method for identifying the physical location of a battery pack, based on the battery pack physical location identification device as described in any one of claims 1 to 11, characterized in that, Includes the following steps: Step S1: The main controller sends a device search start command to the inverter; Step S2: After receiving the device search command, the inverter sends an initial physical location identification signal to the nth battery pack connected to it; Step S3: The nth battery pack determines its initial position based on the initial physical position identification signal sent by the inverter, and sends an intermediate physical position identification signal to the (n+1)th battery pack connected to it. Step S4: The (n+1)th battery pack connected to the nth battery pack determines its own physical position according to the intermediate physical position identification signal, and the (n+1)th battery pack continues to send the intermediate physical position identification signal to the (n+2)th battery pack connected to it to determine the physical position of the (n+2)th battery pack, where n is an integer greater than or equal to 1; Step S5: After all battery packs have completed physical location identification, the main controller sends a termination resistor closing trigger signal to the battery pack that has finally confirmed its physical location via the communication bus. Upon receiving the termination resistor closing trigger signal, the battery pack that has finally confirmed its physical location closes the electronic control switch inside the battery pack. The communication bus is connected to the termination matching resistor at the end.

13. The battery pack physical location identification method according to claim 12, characterized in that, The terminating resistor at the beginning of the communication bus is located in the main controller.

14. The battery pack physical location identification method according to claim 12, characterized in that, In step S1, the main controller also sends a black start signal to the start switch in the battery pack via the auxiliary power control line. After receiving the black start signal, the start switch in the battery pack closes the power supply of the battery controller to complete the power-on of the battery pack.

15. The battery pack physical location identification method according to claim 12, characterized in that, The main controller assigns a virtual address to each battery pack via a communication bus, and maintains communication with the battery packs that have completed the virtual address assignment in order to obtain the number of battery packs.

16. The battery pack physical location identification method according to claim 15, characterized in that, The battery pack that has obtained a virtual address reports its current physical location through the communication bus. If the battery pack has not yet been assigned a physical location, it will report an invalid physical location to detect the completion rate of the battery pack physical location identification.

17. The battery pack physical location identification method according to claim 12, characterized in that, The physical location intermediate identification signal is a square wave signal. The battery pack determines its physical location based on the frequency or duty cycle of the received physical location intermediate identification signal.

18. A photovoltaic power station start-up addressing method, comprising issuing a photovoltaic power station start-up command and configuring the start-up via a terminal, characterized in that, While issuing the station start command, the physical location of the battery pack is automatically searched and determined. The process of searching and determining the physical location of the battery pack adopts the battery pack physical location identification method as described in any one of claims 12 to 17.

19. The photovoltaic power station site selection method according to claim 18, characterized in that, After the physical location of the battery packs is searched and determined, the physical location of each battery pack is reported to the main controller via the CAN bus.

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