Inverter test system and photovoltaic system
By using sampling sensors and a host computer in the inverter testing system, the problem of fault location when the inverter is connected to multiple PV side lines was solved, the accuracy and efficiency of PLC function testing were achieved, and the working performance of the photovoltaic system was improved.
Patent Information
- Application Number
- CN202423098199.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-13
- Publication Date
- 2026-01-23
- Estimated Expiration
- 2034-12-13
AI Technical Summary
When the inverter is connected to multiple PV-side lines, it is difficult to accurately detect and locate the faulty PV-side line, resulting in inaccurate PLC function testing.
An inverter testing system was designed, including multiple optimizers, a first communication port, a second communication port, and a host computer. The system obtains the communication link quality between each optimizer and the inverter through sampling sensors, and uses the host computer to receive the sampling results to determine the connection line of the faulty photovoltaic side connection terminal.
It achieves accuracy and efficiency in inverter PLC function testing, quickly locates faulty PV-side lines, and improves the working performance of photovoltaic systems.
Smart Images
Figure CN223827753U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to inverter technical field more specifically, relate to a kind of testing system and photovoltaic system of inverter. BACKGROUND
[0002] In related art, power line communication (PLC) can be used in photovoltaic inverter communication.
[0003] However, in the case of connecting multiple PV side lines to the inverter, it is difficult for the inverter to accurately perceive the fault PV side line when performing PLC function testing. SUMMARY
[0004] The utility model embodiment provides a kind of testing system and photovoltaic system of inverter.
[0005] The testing system of inverter provided by the utility model embodiment includes multiple optimizers, a first communication port, a second communication port and an upper computer. One end of each of the optimizers is connected to a corresponding photovoltaic side connection end, and the other end of each of the optimizers is connected to a corresponding DC source. Each of the optimizers is communicatively connected to the inverter via the first communication port, and a sampling sensor is provided on the communication link between the optimizer and the inverter. The upper computer is connected to the inverter via the second communication port, and the upper computer is configured to receive the sampling results of the sampling sensor.
[0006] In some embodiments, the sampling sensor includes a first sampling sensor, and the first sampling sensor is disposed on the connection line between the photovoltaic side connection end and the DC source.
[0007] In some embodiments, the first sampling sensor includes a plurality of first magnetic rings, and the connection line between each of the photovoltaic side connection ends and the corresponding DC source passes through a corresponding one of the first magnetic rings.
[0008] In some embodiments, the sampling sensor includes a second sampling sensor, and the second sampling sensor is disposed on the connection line between the photovoltaic side connection end and the inverter.
[0009] In some embodiments, the second sampling sensor includes a plurality of second magnetic rings, and the connection line between each of the photovoltaic side connection ends and the corresponding optimizer passes through a corresponding one of the second magnetic rings.
[0010] In some embodiments, the testing system further includes an air switch, and the air switch is connected between the DC source and the photovoltaic assembly.
[0011] In some embodiments, one of the optimizers is connected between a corresponding photovoltaic-side connection terminal and a corresponding DC source; or multiple optimizers are connected in series between a corresponding photovoltaic-side connection terminal and a corresponding DC source.
[0012] In some implementations, for each of the N optimizers, a first terminal of the optimizer is electrically connected to a corresponding photovoltaic-side connection terminal, and a second terminal of the optimizer is electrically connected to a corresponding DC source.
[0013] In some embodiments, the test system further includes N-1 resistors. For each of the N-1 optimizers, the first terminal of the optimizer is electrically connected to a corresponding photovoltaic-side connection terminal, and the second terminal of the optimizer is electrically connected to the photovoltaic module through a corresponding voltage conversion circuit and a corresponding resistor. Alternatively, the test system further includes N resistors. For each of the N optimizers, the first terminal of the optimizer is electrically connected to a corresponding photovoltaic-side connection terminal, and the second terminal of the optimizer is electrically connected to the photovoltaic module through a corresponding voltage conversion circuit and a corresponding resistor.
[0014] The photovoltaic system provided in this application includes the testing system provided in this application.
[0015] This invention provides a testing system for an inverter and a photovoltaic system. The testing system includes multiple optimizers, a first communication port, a second communication port, and a host computer. One end of each optimizer is connected to a corresponding photovoltaic-side connection terminal, and the other end of each optimizer is connected to a corresponding DC source. Each optimizer is communicatively connected to the inverter through the first communication port, and a sampling sensor is provided on the communication link connecting the optimizer and the inverter. The host computer is connected to the inverter through the second communication port and is used to receive the sampling results from the sampling sensor.
[0016] During PLC function testing of the inverter, the host computer can receive the sampling results from each sampling sensor to obtain the communication link quality between each optimizer and the inverter, thereby identifying the faulty photovoltaic side connection line. Even if an inverter fault occurs, such as misconnection or omission of communication devices between the inverter and optimizer, or misconnection or omission of connection lines between the inverter and optimizer, the faulty PV side line can be quickly located, enabling the testing system to accurately and efficiently complete the PLC function test of the inverter.
[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description
[0018] The above and / or additional aspects and advantages of this invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:
[0019] Figure 1 This is a schematic diagram of a test system and a photovoltaic system according to certain embodiments of this utility model;
[0020] Figure 2 This is a schematic diagram of a testing system according to certain embodiments of the present invention;
[0021] Figure 3 This is a circuit diagram showing the optimizer connection in some embodiments of this utility model;
[0022] Figure 4 This is a circuit diagram showing the optimizer connection in some embodiments of this utility model;
[0023] Figure 5 This is a circuit diagram showing the optimizer connection in some embodiments of this utility model.
[0024] Reference numerals: Inverter 10, Test system 100, Photovoltaic system 1000, Photovoltaic side connection terminal 11, First communication port 12, Second communication port 13, Optimizer 20, Host computer 30, First sampling sensor 40, First magnetic ring 41, Second sampling sensor 50, Second magnetic ring 51, Photovoltaic module connection terminal 60, Air switch 61. Detailed Implementation
[0025] The embodiments of this utility model are described in detail below, and these embodiments are illustrated in the accompanying drawings. Throughout the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.
[0026] In related technologies, power line communication (PLC) technology can be used for communication in photovoltaic inverters. The PLC communication medium includes a master node and a slave node. The inverter's processor (ARM) communicates with the PLC master node board, and the master node board communicates with the slave node board inside the optimizer connected to the PV side (photovoltaic side) cable, thereby realizing power line communication between the inverter and the optimizer.
[0027] During the inverter assembly process, inverter malfunctions may occur, such as incorrect or missing connections of communication devices between the inverter and the optimizer, or incorrect or missing connections of the connection lines between the inverter and the optimizer, leading to malfunctions in the PV side lines.
[0028] When an inverter is connected to multiple PV-side lines, it is difficult for the inverter to accurately detect the faulty PV-side line during PLC function testing.
[0029] To address the aforementioned technical problems, this utility model provides a testing system for an inverter and a photovoltaic system (such as...). Figures 1-5 As shown in the figure, the test system can accurately and efficiently complete the inverter PLC function test and quickly locate the faulty PV side line.
[0030] Reference Figure 1 In the test system 100 for the inverter 10 provided in this embodiment of the present invention, the inverter 10 includes multiple photovoltaic side connection terminals 11. The test system 100 includes multiple optimizers 20, a first communication port 12, a second communication port 13, and a host computer 30.
[0031] Each optimizer 20 has one end connected to the corresponding photovoltaic side connection terminal 11, and the other end connected to the corresponding DC source. Each optimizer 20 is connected to the inverter 10 via a first communication port 12, and a sampling sensor is provided on the communication link connecting the optimizer 20 and the inverter 10. The host computer 30 is connected to the inverter 10 via a second communication port 13, and the host computer 30 is used to receive the sampling results from the sampling sensor.
[0032] During PLC function testing of inverter 10, host computer 30 can receive the sampling results of each sampling sensor to obtain the communication link quality between each optimizer 20 and inverter 10, thereby determining the faulty photovoltaic side connection terminal 11 connection line. Even if inverter 10 fails, and the communication devices between inverter 10 and optimizer 20 are misconnected or missing, or the connection lines between inverter 10 and optimizer 20 are misconnected or missing, the faulty PV side line can be quickly located, enabling test system 100 to accurately and efficiently complete the PLC function test of inverter 10.
[0033] This utility model embodiment also provides a photovoltaic system 1000, including the test system 100 provided in this utility model embodiment. Therefore, the photovoltaic system 1000 including the test system 100 has the beneficial effect of ensuring that the inverter 10 can accurately and efficiently complete the PLC function test and quickly locate the faulty PV side line, thereby improving the working performance of the photovoltaic system 1000.
[0034] Specifically, with Figure 3For example, the four photovoltaic-side connection terminals 11 of the inverter 10 may include connection terminals PV1+, PV1-, PV2+, PV2-, PV3+, PV3-, PV4+, and PV4-. Connection terminals PV1+, PV2+, PV3+, and PV4+ can be the positive terminals of the photovoltaic-side connection terminals 11, while connection terminals PV1-, PV2-, PV3-, and PV4- can be the negative terminals of the photovoltaic-side connection terminals 11.
[0035] by Figure 3 For example, the four optimizers 20 of the test system 100 may include devices A1, A2, A3, and A4. Each optimizer 20 may include a connection terminal OUT+, a connection terminal OUT-, a connection terminal IN+, and a connection terminal IN-. Connection terminals IN+ and IN- can be connected to a DC source, and the DC source is output from connection terminals OUT+ and OUT-. Connection terminal OUT+ can be connected to the positive terminal of a corresponding photovoltaic-side connection terminal 11, and connection terminal OUT- can be connected to the negative terminal of a corresponding photovoltaic-side connection terminal 11. Connection terminal PV1+ can be connected to the OUT+ terminal of device A1, and connection terminal PV1- can be connected to the OUT- terminal of device A1. Connection terminal PV2+ can be connected to the OUT+ terminal of device A2, and connection terminal PV2- can be connected to the OUT- terminal of device A2. Connection terminal PV3+ can be connected to the OUT+ terminal of device A3, and connection terminal PV3- can be connected to the OUT- terminal of device A3. The PV4+ terminal can be connected to the OUT+ terminal of device A4, and the PV4- terminal can be connected to the OUT- terminal of device A4.
[0036] When performing PLC function tests on inverter 10, a master-slave node architecture can be adopted, which helps to optimize communication efficiency and network management, so as to verify the correctness, stability and efficiency of the communication protocol.
[0037] Any one of devices A1, A2, A3 and A4 can be a slave node, and inverter 10 can be a master node. Devices A1, A2, A3 and A4 can all communicate with inverter 10 through the first communication port 12.
[0038] During PLC function testing of inverter 10, inverter 10 can establish communication connections with devices A1, A2, A3, and A4. During the establishment of these communication connections, sampling sensors on the communication links connecting devices A1, A2, A3, and A4 to inverter 10 can sample the communication link quality and send this quality data to the host computer.
[0039] In some embodiments, the peer communication protocol between optimizer 20 and inverter 10 may be Universal Asynchronous Receiver / Transmitter (UART).
[0040] In some embodiments, during the establishment of a communication connection, the inverter 10 can also obtain the communication link quality corresponding to each optimizer 20 in real time. The inverter 10 can communicate with the host computer 30 through the second communication port 13 and send the communication link quality corresponding to each optimizer 20 to the host computer 30 through the second communication port 13.
[0041] In some embodiments, the communication protocol between the inverter 10 and the host computer 30 may be a four-wire balanced multi-point data communication protocol (RS485).
[0042] The host computer 30 can determine the PLC function test results of the inverter 10 based on the communication link quality corresponding to each of devices A1, A2, A3, and A4. If the host computer 30 replies with a success message after reading the automated test results, the PLC communication link can be considered normal. If the host computer 30 replies with a failure message after reading the automated test results, it can read detailed failure information, determine which optimizer 20 has a communication abnormality, pop up a prompt, and then determine which photovoltaic side connection terminal 11 has a connection line fault.
[0043] For example, if the inverter 10 cannot establish a communication connection with device A1, or if the quality of the communication link corresponding to device A1 does not meet the standard, it can be assumed that there is a fault in the connection terminal PV1+ or connection terminal PV1-, and there may be incorrect or missing connections in the connection terminals PV1+ or PV1-.
[0044] Thus, the test system 100 can determine the test results corresponding to each of the connection terminals PV1+, PV1-, PV2+, PV2-, PV3+, PV3-, PV4+, and PV4- based on the communication link quality of each of the devices A1, A2, A3, and A4, and accurately locate the connection line of the photovoltaic side connection terminal 11 with a fault.
[0045] In some implementations, the host computer 30 is configured to set the topology of the power line carrier communication network of the inverter 10, and determine the communication link quality between the host computer 30 and the inverter 10 and the communication link quality between the inverter 10 and the optimizer 20 based on the topology setting result.
[0046] Specifically, the host computer 30 can send the configured power line carrier communication network topology to the inverter 10. The topology needs to be configured according to the actual physical layout of the master and slave nodes, that is, according to the actual physical layout of the optimizer 20 (which can have multiple optimizers 20).
[0047] If the topology is set correctly, the host computer 30 will receive a result indicating that the topology is set correctly. This confirms that the communication links between the host computer 30 and the inverter 10, as well as between the inverter 10 and the optimizer 20, are functioning normally. If the topology setting fails, the host computer 30 will receive a result indicating that the topology setting failed. This confirms that there are abnormalities in the communication links between the host computer 30 and the inverter 10, as well as between the inverter 10 and the optimizer 20.
[0048] In some embodiments of this invention, the topology binding optimizer 20 sent by the host computer 30 is labeled accordingly to ensure the accurate installation position of the optimizer 20. After determining the installation position of the optimizer 20, the SN label can be removed from the optimizer 20, and the SN label can be pasted on the corresponding position of the physical view template according to the actual position of the optimizer 20, and the topology can be set sequentially.
[0049] After the host computer 30 obtains the result that the topology settings are correct, the host computer 30 can send an automatic test command. After receiving the automatic test command, the optimizer 20 can perform automatic testing and enter the test state.
[0050] In some implementations, the DC source can be provided by the photovoltaic (PV) modules, and each optimizer 20 can independently perform maximum power point tracking (MPPT) on the connected PV modules, improving the efficiency of individual modules. There is a maximum power point between the output voltage and current of a PV module, corresponding to the maximum power output of the module. MPPT technology dynamically adjusts the operating point of the PV module, ensuring that the PV module operates at its maximum power point under various changing light conditions, thus guaranteeing the efficiency of the PV module.
[0051] In some embodiments, the component-level power electronics (MLPE) built into the optimizer 20 can enable communication with the inverter 10 and can also enable a controller to implement maximum power point tracking (MPPT).
[0052] Reference Figure 2 In some embodiments, the sampling sensor includes a first sampling sensor 40, which is disposed on the connection line between the photovoltaic side connection terminal 11 and the DC source.
[0053] Specifically, the first sampling sensor 40 is installed on the connection line between the photovoltaic side connection terminal 11 and the DC source, and samples the power line carrier signal of the connection line between the photovoltaic side connection terminal 11 and the DC source. When the inverter 10 performs PLC function testing, the inverter 10 establishes a communication connection with the optimizer 20, and the host computer 30 can determine the quality of the communication link between each optimizer 20 and the inverter 10 through the signal sampled by the first sampling sensor 40.
[0054] Reference Figure 2 In some embodiments, the first sampling sensor 40 includes a plurality of first magnetic rings 41, and a corresponding first magnetic ring 41 is passed through the connection line between each photovoltaic side connection terminal 11 and the corresponding DC source.
[0055] Specifically, in related technologies, a magnetic ring in inverter 10 contains multiple input (multi-PV) lines, making it impossible to distinguish which line is malfunctioning. There is no crosstalk between the lines, and during assembly, the lines may be routed outside the magnetic ring. If the distance is not far, the magnetic ring can still detect the signal, resulting in signals at all inputs passing through the ring, further complicating the identification process. During the testing of inverter 10, crosstalk between the lines further exacerbates the difficulty of identification.
[0056] The connection line between each photovoltaic-side connection terminal 11 and the optimizer 20 passes through the inside of a first magnetic ring 22, and the power line carrier signal of the connection line inside the first magnetic ring 22 is extracted. Each first magnetic ring 41 houses a connection line between the photovoltaic-side connection terminal 11 and the optimizer 20, and the connection lines of each photovoltaic-side connection terminal 11 are configured to be electromagnetically isolated from each other.
[0057] In some embodiments, the first sampling sensor 40 may include a first magnetic ring 41, and the inverter 10 may include a photovoltaic side connection terminal 11. The connection line between the photovoltaic side connection terminal 11 and the corresponding DC source passes through the corresponding first magnetic ring 41.
[0058] Reference Figure 2 In some embodiments, the first sampling sensor 40 may include four first magnetic rings 41, and the inverter 10 may include four photovoltaic side connection terminals 11, which are respectively denoted as PV1+, PV2+, PV3+ and PV4+.
[0059] A first magnetic ring 41 is passed through the connection line between PV1+ and the corresponding DC source, the first magnetic ring 41 is passed through the connection line between PV2+ and the corresponding DC source, the first magnetic ring 41 is passed through the connection line between PV3+ and the corresponding DC source, and the first magnetic ring 41 is passed through the connection line between PV4+ and the corresponding DC source.
[0060] During PLC function testing of inverter 10, inverter 10 establishes a communication connection with optimizer 20. The connection line between photovoltaic side connection terminal 11 and optimizer 20 also generates a corresponding power line carrier signal. Each first magnetic ring 41 contains a connection line between photovoltaic side connection terminal 11 and optimizer 20. The connection lines of each photovoltaic side connection terminal 11 are configured to be electromagnetically isolated from each other. During testing, the signals of each PV side connection line will not interfere with each other, reducing the difficulty of differentiation during testing.
[0061] Reference Figure 2 In some embodiments, the sampling sensor includes a second sampling sensor 50, which is disposed on the connection line between the photovoltaic side connection terminal 11 and the inverter 10.
[0062] Specifically, the second sampling sensor 50 is installed on the connection line between the photovoltaic side connection terminal 11 and the inverter, and samples the power line carrier signal of the connection line between the photovoltaic side connection terminal 11 and the inverter. When the inverter 10 performs PLC function testing, the inverter 10 establishes a communication connection with the optimizer 20, and the host computer 30 can determine the quality of the communication link between each optimizer 20 and the inverter 10 through the signal sampled by the second sampling sensor 50.
[0063] Reference Figure 2 In some embodiments, the second sampling sensor 50 includes a plurality of second magnetic rings, and a corresponding second magnetic ring 51 is passed through the connection line between each photovoltaic side connection terminal 11 and the corresponding optimizer 20.
[0064] In some embodiments, the second sampling sensor 50 may include a second magnetic ring 51, and the inverter 10 may include a photovoltaic side connection terminal 11. The connection line between the photovoltaic side connection terminal 11 and the corresponding optimizer 20 passes through the corresponding second magnetic ring 51.
[0065] Reference Figure 2 In some embodiments, the second sampling sensor 50 may include four second magnetic rings 51, and the inverter 10 may include four photovoltaic side connection terminals 11, which are respectively denoted as PV1+, PV2+, PV3+ and PV4+.
[0066] The connection lines between PV1+ and the corresponding optimizer 20 are connected by a corresponding second magnetic ring 51, the connection lines between PV2+ and the corresponding optimizer 20 are connected by a corresponding second magnetic ring 51, the connection lines between PV3+ and the corresponding optimizer 20 are connected by a corresponding second magnetic ring 51, and the connection lines between PV4+ and the corresponding optimizer 20 are connected by a corresponding second magnetic ring 51.
[0067] During PLC function testing of inverter 10, inverter 10 establishes a communication connection with optimizer 20. The connection line between photovoltaic side connection terminal 11 and optimizer 20 also generates a corresponding power line carrier signal. Each second magnetic ring 51 contains a connection line between photovoltaic side connection terminal 11 and optimizer 20. The connection lines of each photovoltaic side connection terminal 11 are configured to be electromagnetically isolated from each other. During testing, the signals of each PV side connection line will not interfere with each other, reducing the difficulty of differentiation during testing.
[0068] Reference Figure 3 or Figure 4 In some embodiments, the test system 100 further includes a photovoltaic module connection terminal 60 and an air switch 61. The photovoltaic module connection terminal 60 is used to connect the photovoltaic module, and the air switch 61 is connected between the photovoltaic module connection terminal 60 and the DC source.
[0069] Specifically, with Figure 3 For example, the air switch 61 may include switching device QF1 and switching device QF2, and the photovoltaic module connection terminal 60 may include connection terminal L0 and connection terminal N0. Connection terminal L0 can be connected to the live wire of the photovoltaic module power supply line, and connection terminal N0 can be connected to the neutral wire of the photovoltaic module power supply line.
[0070] Switching device QF1 can be connected between connection terminal L0 and connection terminal L of devices B1, B2, B3 and B4, and switching device QF2 can be connected between connection terminal N0 and connection terminal N of devices B1, B2, B3 and B4.
[0071] Devices B1, B2, B3, and B4 may each include a connection terminal DC+, a connection terminal DC-, a connection terminal L, and a connection terminal N. Connection terminal L can be connected to the live wire of the power supply, and connection terminal N can be connected to the neutral wire of the power supply.
[0072] Device B1 can be connected to device A1 via connection terminals DC+ and DC- through connection terminals IN+ and IN-. Device B2 can be connected to device A2 via connection terminals DC+ and DC- through connection terminals IN+ and IN- through connection terminals DC+ and DC- through connection terminals DC+ and DC- through connection terminals IN+ and IN- through connection terminals DC+ and DC- through connection terminals IN+ and IN- through connection terminals DC+ and DC- through connection terminals IN+ and IN- through connection terminals DC+ and DC- through connection terminals IN+ and IN- through connection terminals IN- through connection terminals DC+ and DC- through connection terminals IN-.
[0073] Devices B1, B2, B3, and B4 can all be voltage conversion circuits. When both switching devices QF1 and QF2 are closed, the generated voltage from the photovoltaic module connected to terminals L0 and N0 can be supplied to devices B1, B2, B3, and B4. Devices B1, B2, B3, and B4 can provide a stable DC source (e.g., a 48V DC source voltage) and supply the DC source to the corresponding optimizer.
[0074] When the current in the circuit exceeds the set safety threshold, the air switch 61 will automatically disconnect the circuit to prevent overload, short circuit, or other situations that may lead to fire or other hazards. When there is an overcurrent in the current flowing through the connection terminal L0 between devices B1, B2, B3, and B4, switch QF1 will disconnect. When there is an overcurrent in the current flowing through the connection terminal N0 between devices B1, B2, B3, and B4, switch QF2 will disconnect.
[0075] Reference Figure 3 or Figure 4 In some implementations, an optimizer 20 is connected between a corresponding photovoltaic-side connection 11 and a corresponding DC source.
[0076] Specifically, devices B1, B2, B3, and B4 can each provide a DC source. Devices A1, A2, A3, and A4 can serve as four optimizers 20 for the test system 100.
[0077] The four photovoltaic-side connection terminals 11 may include connection terminals PV1+, PV1-, PV2+, PV2-, PV3+, PV3-, PV4+, and PV4-. Connection terminals PV1+, PV2+, PV3+, and PV4+ can be the positive electrodes of the four photovoltaic-side connection terminals 11, while connection terminals PV1-, PV2-, PV3-, and PV4- can be the negative electrodes of the four photovoltaic-side connection terminals 11.
[0078] The input terminal of device A1 can be connected to device B1, and the output terminal of device A1 can be connected to terminals PV1+ and PV1-. The input terminal of device A2 can be connected to device B2, and the output terminal of device A2 can be connected to terminals PV2+ and PV2-. The input terminal of device A3 can be connected to device B3, and the output terminal of device A3 can be connected to terminals PV3+ and PV3-. The input terminal of device A4 can be connected to device B4, and the output terminal of device A4 can be connected to terminals PV4+ and PV4-.
[0079] ReferenceFigure 5 In some implementations, multiple optimizers 20 are connected in series between a corresponding photovoltaic-side connection terminal 11 and a corresponding DC source.
[0080] by Figure 5 For example, the output terminal of device B1 is connected to the connection terminals PV1+ and PV1- in series through k optimizers. The k optimizers can be denoted as devices A11 to A1k. The output terminal of device B1 is connected to the connection terminals PV1+ and PV1- in sequence through devices A11 to A1k.
[0081] In some embodiments of this application, up to 256 optimizers 20 can be connected in series between a DC source and a photovoltaic side connection terminal 11, that is, k can be up to 256.
[0082] Reference Figure 3 or Figure 4 In some implementations, for each of the N optimizers 20, the first end of the optimizer 20 is electrically connected to a corresponding photovoltaic side connection terminal 11, and the second end of the optimizer 20 is electrically connected to a corresponding DC source.
[0083] Specifically, taking N=4 as an example, the input terminal of device A1 can be connected to device B1, and the output terminal of device A1 can be connected to connection terminals PV1+ and PV1-. The input terminal of device A2 can be connected to device B2, and the output terminal of device A2 can be connected to connection terminals PV2+ and PV2-. The input terminal of device A3 can be connected to device B3, and the output terminal of device A3 can be connected to connection terminals PV3+ and PV3-. The input terminal of device A4 can be connected to device B4, and the output terminal of device A4 can be connected to connection terminals PV4+ and PV4-.
[0084] Reference Figure 3 In some embodiments, the test system 100 further includes N-1 resistors. For each of the N-1 optimizers 20, the first end of the optimizer 20 is electrically connected to a corresponding photovoltaic side connection terminal 11 through a corresponding resistor, and the second end of the optimizer 20 is electrically connected to a corresponding DC source.
[0085] Specifically, refer to Figure 3 With N being 4, the test system also includes 3 resistors, which can be denoted as resistor element R1, resistor element R2 and resistor element R3 respectively.
[0086] For device A2, its OUT+ terminal can be connected to the PV2+ connection terminal. The IN+ terminal of device A2 can be connected to the DC+ terminal of device B2. The L terminal of device B2 is connected to the L0 terminal of photovoltaic module connection terminal 60 through resistor R1. The L0 terminal of photovoltaic module connection terminal 60 can be connected to a photovoltaic module.
[0087] For device A3, its OUT+ terminal can be connected to the PV3+ connection terminal. The IN+ terminal of device A3 can be connected to the DC+ terminal of device B3. The L terminal of device B3 is connected to the L0 terminal of photovoltaic module connection terminal 60 through resistor R2. The L0 terminal of photovoltaic module connection terminal 60 can be connected to a photovoltaic module.
[0088] For device A4, its OUT+ terminal can be connected to connection terminal PV4. The IN+ terminal of device A4 can be connected to the DC+ terminal of device B4. The L terminal of device B4 is connected to the L0 terminal of photovoltaic module connection terminal 60 through resistor R3. The L0 terminal of photovoltaic module connection terminal 60 can be connected to a photovoltaic module.
[0089] Reference Figure 4 The test system 100 also includes N resistors. For each of the N optimizers 20, the first end of the optimizer 20 is electrically connected to a corresponding photovoltaic side connection terminal 11 through a corresponding resistor, and the second end of the optimizer 20 is electrically connected to a corresponding DC source.
[0090] Specifically, refer to Figure 3 With N being 4, the test system also includes 4 resistors, which can be denoted as resistor element R1, resistor element R2, resistor element R3 and resistor element R4 respectively.
[0091] For device A1, the OUT+ terminal of device A1 can be connected to the connection terminal PV1+. The IN+ terminal of device A1 can be connected to the DC+ terminal of device B1. The L terminal of device B1 is connected to the L0 terminal of photovoltaic module connection terminal 60 through the resistor element R1. The L0 terminal of photovoltaic module connection terminal 60 can be connected to a photovoltaic module.
[0092] For device A2, its OUT+ terminal can be connected to the PV2+ connection terminal. The IN+ terminal of device A2 can be connected to the DC+ terminal of device B2. The L terminal of device B2 is connected to the L0 terminal of photovoltaic module connection terminal 60 through resistor R2. The L0 terminal of photovoltaic module connection terminal 60 can be connected to a photovoltaic module.
[0093] For device A3, its OUT+ terminal can be connected to the PV3+ connection terminal. The IN+ terminal of device A3 can be connected to the DC+ terminal of device B3. The L terminal of device B3 is connected to the L0 terminal of photovoltaic module connection terminal 60 through resistor R3. The L0 terminal of photovoltaic module connection terminal 60 can be connected to a photovoltaic module.
[0094] For device A4, its OUT+ terminal can be connected to connection terminal PV4. The IN+ terminal of device A4 can be connected to the DC+ terminal of device B4. The L terminal of device B4 is connected to the L0 terminal of photovoltaic module connection terminal 60 through resistor R4. The L0 terminal of photovoltaic module connection terminal 60 can be connected to a photovoltaic module.
[0095] In the description of this specification, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with an embodiment or example that are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.
[0096] Furthermore, the term "connection" should be interpreted broadly. For example, it can include a fixed connection, a detachable connection, or an integral connection; it can include a direct connection or an indirect connection through an intermediate medium; and it can also include communication between the internal components of two elements. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0097] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0098] Any process or method described in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing a particular logical function or process, and the scope of the preferred embodiments of the present invention includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order according to the functions involved, as should be understood by those skilled in the art to which embodiments of the present invention pertain.
[0099] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.
Claims
1. A testing system for an inverter, characterized in that, The inverter includes multiple photovoltaic-side connection terminals, and the test system includes: Multiple optimizers, one end of each optimizer is connected to the corresponding photovoltaic side connection terminal, and the other end of each optimizer is connected to the corresponding DC source; A first communication port is provided, through which each optimizer is connected to the inverter, and a sampling sensor is provided on the communication link connecting the optimizer and the inverter; The host computer and the second communication port are provided. The host computer is connected to the inverter through the second communication port and is used to receive the sampling results from the sampling sensor.
2. The testing system according to claim 1, characterized in that, The sampling sensor includes a first sampling sensor, which is disposed on the connection line between the photovoltaic side connection terminal and the DC source.
3. The testing system according to claim 2, characterized in that, The first sampling sensor includes a plurality of first magnetic rings, and a corresponding first magnetic ring is passed through the connection line between each photovoltaic side connection terminal and the corresponding DC source.
4. The testing system according to claim 1, characterized in that, The sampling sensor includes a second sampling sensor, which is disposed on the connection line between the photovoltaic side connection terminal and the inverter.
5. The testing system according to claim 4, characterized in that, The second sampling sensor includes a plurality of second magnetic rings, and a corresponding second magnetic ring is passed through the connection line between each photovoltaic side connection terminal and the corresponding optimizer.
6. The testing system according to claim 1, characterized in that, The testing system also includes an air switch, which is connected between the DC source and the photovoltaic module.
7. The testing system according to claim 1, characterized in that, One of the optimizers is connected between a corresponding photovoltaic-side connection terminal and a corresponding DC source; or Multiple optimizers are connected in series between a corresponding photovoltaic-side connection terminal and a corresponding DC source.
8. The testing system according to claim 1, characterized in that, For each of the N optimizers, the first end of the optimizer is electrically connected to a corresponding photovoltaic-side connection terminal, and the second end of the optimizer is electrically connected to the corresponding DC source.
9. The testing system according to claim 8, characterized in that, The test system also includes N-1 resistors. For each of the N-1 optimizers, the first terminal of the optimizer is electrically connected to a corresponding photovoltaic-side connection terminal, and the second terminal of the optimizer is electrically connected to the photovoltaic module through a corresponding voltage conversion circuit and a corresponding resistor; or The test system also includes N resistors. For each of the N optimizers, the first end of the optimizer is electrically connected to a corresponding photovoltaic side connection terminal, and the second end of the optimizer is electrically connected to the photovoltaic module through a corresponding voltage conversion circuit and a corresponding resistor.
10. A photovoltaic system, characterized in that, The photovoltaic system includes the testing system according to any one of claims 1-9.