Repair detection platform for intelligent detection unit of photovoltaic combiner box

Abstract

In order to connect all photovoltaic panels together in series, it is not practical that all wires are directly connected together and placed in an inverter in a photovoltaic power station. Therefore, a plurality of middle parts are the combiner box which gathers the lines like the capillaries into coarse blood vessels and then connects the coarse blood vessels to the inverter, which is similar to the effect of converting the capillaries of a human body into the coarse blood vessels. And meanwhile, a device for detecting the current of each branch is arranged in the combiner box, so that the operation condition of each photovoltaic branch is detected in real time and the electric quantity is collected. The device is an intelligent detection unit. The platform is used for detecting and repairing the intelligent detection unit.

Description

[0001] 1. Technical field: A repair and testing platform for the intelligent detection unit of a photovoltaic combiner box;

[0002] 2. Background technology: Existing technology: The photovoltaic industry is currently developing well, and the photovoltaic industry will continue to expand in the future. Faced with a huge development market, the number of various devices used is also huge. A 20MW photovoltaic power station has 300 intelligent detection units for photovoltaic array current collection. Looking at the national photovoltaic industry, the number of such devices is huge. The platform can test such devices (intelligent detection units). It can complete the acceptance inspection of newly purchased parts in the power plant and the inspection of damaged parts. Timely discover problems with new parts to prevent faults caused by the installation of problematic devices on operating equipment. For recycling plants, a large number of obsolete parts can be inspected and repaired, and the error judgment of each branch current can be carried out. A large number of damaged devices can be repaired, and recycling generates great economic value. However, in the face of detection and repair, there is currently no such convenient and low-cost detection platform for use on site in various power plants. The platform can solve the existing detection difficulties on site, and also provide assistance for the repair of damaged parts on site.

[0003] 3. Invention content: The platform is easy to manufacture, low in cost, and uses common materials. In view of the huge number of photovoltaic combiner box intelligent detection devices used in the national photovoltaic industry, but there is no effective detection device, the platform can quickly complete the device inspection and assist in the inspection and repair of damaged parts. 4. Description of the drawings:

[0004] The specific structure of this patent is given by the following embodiments and their drawings.

[0005] Figure 1 This is a photo of the actual main circuit.

[0006] Figure 2 This is a real overall picture.

[0007] Figure 3 Displays the location and size of the platform screw through-hole.

[0008] Figure 4 : Example diagram of the circuit breaker for controlling the on and off of the two power supplies on the platform.

[0009] Figure 5 : Schematic diagram of the layout and circuits of two power supplies.

[0010] Figure 6 : Schematic diagram of the insulation treatment of the screw and loop wire.

[0011] Figure 7 :Schematic diagram of the platform closed state.

[0012] Figure 8 :Schematic diagram of the platform opening state.

[0013] Fig. 9 : Top view of the overall joint part of the platform safety base and the contact screw.

[0014] Fig.10 : The red box indicates the joint part of the platform safety base and the contacting screw.

[0015] Fig.11 : Schematic diagram of installing the bad parts to be repaired on the platform for testing.

[0016] Fig.12 :Schematic diagram of inserting the intelligent detection unit and power-on test.

[0017] Fig.13 : Schematic diagram of testing various types of intelligent detection units installed on the platform for testing.

[0018] Fig.14 : Overall schematic diagram of the newly purchased intelligent detection unit.

[0019] 5. Advantages:

[0020] 1. The photovoltaic industry is currently developing well, and the number of such devices is huge. This patent can be used to test and assist in repairing such devices (intelligent detection units).

[0021] 2. It can complete the acceptance inspection of newly purchased parts and the inspection of damaged parts of photovoltaic power stations. It can also carry out inspection and repair of a large number of obsolete parts and error judgment of each branch current.

[0022] 3. For a single power plant, a large number of damaged old parts can be inspected and repaired, saving a lot of funds for repairing and reusing waste.

[0023] 4. Recycling and repair shops can also carry out inspection and repair of recycled parts, which generates great economic value.

[0024] 5. The platform uses a relatively thin lead screw inserted into the inspection device to ensure hardness and current carrying capacity. It can be applied to various types of intelligent acquisition units. Since the line spacing requirements of various manufacturers are basically the same, it can be applied to various types of intelligent acquisition units. This platform is a 16-branch test platform, so it can measure devices with less than 16 branches. If there are more than 16 branches, a detection platform with the corresponding number of branches can be made according to the on-site conditions.

[0025] 6. The materials used are all easily available on site, such as the power module of an old desktop computer that has been eliminated can be used as the platform building material. Wood boards, wooden frames and other materials are all easily available. The power supply is AC220V, which meets the conditions of easy access.

[0026] 7. For the convenience of movement, wheels are installed on the platform for easy movement. In order to ensure the stability of the platform, multiple diagonal braces are added to ensure the stability of the platform.

[0027] 6. Disadvantages:

[0028] 1. There are still some shortcomings in the built platform. The branch current can only be checked one by one through the device's LCD display. There are still deficiencies in the overall convenient comparative observation. It is necessary to establish a laptop communication connection and complete the connection between the communication port of the intelligent collector and the laptop. The device uses the RS232 communication protocol. The manufacturer has collected the device point table and instructions. It is necessary to make a software (or applet) whose software window can display all branch currents at the same time. Intuitive window comparison can be faster and more accurate in finding problems and fault points. At the same time, it can also realize parameters such as the total voltage of the device and the temperature of the device. There is no need to operate the LCD screen one by one for observation.

[0029] 2. The platform construction is relatively rough. For example, the lead screw used should be a smooth metal rod to reduce the resistance and wear during installation and device.

[0030] 7. Specific plan:

[0031] Let me introduce the role of the intelligent data collection unit: In order to connect all photovoltaic panels in series in a photovoltaic power station, it is unrealistic to directly connect all the wires together and place them on the inverter. Therefore, there are many intermediate parts, such as the junction box, which gathers the capillary-like wires into thick blood vessels and then connects them to the inverter, which is similar to the role of human capillaries turning into thick blood vessels. At the same time, there is a device inside the junction box to detect the current of each branch, and to detect the operation status and power collection of each photovoltaic branch in real time. This device is the "intelligent detection unit". The platform is used to perform the detection and repair functions of the intelligent detection unit. The schematic diagram and actual picture of this patent solution taken on site are as follows: Figure 1 , 2 shown.

[0032] The device needs to provide a DC90-1000V working voltage to provide power for the power supply part for normal operation, and can detect the current of each branch of 0-20A. Figure 3 .

[0033] Use AC220V to DC220V power module to provide 220V DC voltage for device power supply according to the operating conditions of the device. In addition, the power module of the desktop computer is used as AC220V power input and DC output. One of the red and black wires is used (the module itself short-circuits the green wire and any black wire as the signal start line to start the desktop computer power module, so that the module can operate and supply power). Any set of red and black wires can output 5V, 16A current. Both power supplies are normal household AC220V, which is convenient for the power supply conditions of the platform. We connect a 2-10 ohm resistor in series at the output end of the desktop computer power module to complete the current control. The platform uses a 2.5Ω resistor to maintain the output current at about 4A. The circuit is connected in series with the lead screw and the loop at the same time, which will simulate the normal working state of each branch of the intelligent detection unit. The output end of the power module, the resistor, the lead screw, and the loop line are all connected in series. The switching line is actually a 4 square millimeter photovoltaic module PV cable, which completes the annular series connection of the lead screws of each branch. Make sure that each branch is in the direction of top-in and bottom-out. The overall current flow direction is the output end of the desktop computer power module (any red line) - resistor - the upper end of the first branch - the first screw - the lower end of the first branch - use a loop line to connect to the upper end of the second branch, and so on to complete the series connection of all branches and then return to the negative pole of the desktop computer power module (black line). Therefore, the current of all branches is the same, so it is possible to find the damaged branch and find out which branch has problems with the Hall sensor, incorrect display, large deviation, etc. In addition to controlling the current, configuring resistors can also ensure that the loop is not short-circuited. Although there are many screws and loops, the actual resistance is close to 0 ohms. If no resistor is added, a short circuit will occur, burning the desktop computer power module. In addition, two circuit breakers are installed to complete the switching of the two power supplies. The following are illustrated: The circuit breakers that supply and control the on and off of the two power supplies, such as Figure 4 , Figure 5 :

[0034] The lead screw and the loop wire are painted, and the loop wire and the lead screw connection are wrapped and packaged with a heat shrink tube of appropriate size to ensure good contact and prevent electric shock caused by accidental contact. Figure 6 :

[0035] This is a complete picture of the platform. The upper lead screw can be flipped up, and the yellow wooden frame serves to stabilize the lead screw. The perforations of the lead screw and the wooden frame are fixed with glass glue. The yellow wooden frame and the platform board are connected with damping hinges to ensure the stability of the yellow wooden frame when it is flipped up. After flipping it up, the intelligent detection unit to be tested is quickly placed in it to provide test conditions. Because the lead screw is relatively thin and can move to a certain range, it can meet the hole spacing requirements of various intelligent measuring devices and measure various types of devices. The hole spacing of this device is basically the same in the industry, and the cable strung in is also a national standard PV photovoltaic cable, so the size of the device hole is also the same. It can be suitable for testing on this platform. If Figure 7 , Figure 8 :

[0036] As shown in the figure below, after the lead screw is lowered as a whole, it is connected to the loop line to ensure good contact. A safety base of appropriate size is installed inside each branch of the plastic mold. The safety base is installed on the plastic mold, and the lower part of the mold is connected to each loop line. The opening part of the safety base is pressed together with the lead screw to ensure good contact for each loop. The red box part of the figure shows the pressing condition of the safety base. Fig. 9 , 10 ;

[0037] The following figure shows the placement of the intelligent detection unit and the power-on test. The centralized intelligent acquisition units on site have been tested and can be used well. It can be applied to the testing of various models. Fig.11 , 12 , 13, and 14.

Claims

1. A repair and detection platform for a photovoltaic combiner box intelligent detection unit, consisting of a platform, a power supply, and a test part, characterized by: It can quickly connect and measure various types of photovoltaic combiner box intelligent detection units indoors, simulate the normal operation status, and find abnormal Hall sensors, abnormal total voltage display, and abnormal device temperature deviation. It can help judge the quality of the device and provide assistance for repair.

2. The repair and detection platform of the photovoltaic combiner box intelligent detection unit according to claim 1 is characterized by: All branches are replaced with 6mm lead screws. The operating platform can quickly disconnect the lead screw part. After flipping it up, the intelligent detection unit of the photovoltaic combiner box to be inspected is installed in place for rapid testing. At the same time, it meets the test of various types of photovoltaic combiner box intelligent detection units and detects existing problems. The lead screw flip cover adopts an upward flipping method, and all branch lead screws can be operated synchronously. The part fixedly connected to the lead screw adopts a safety base to provide rapid pressing, which improves the efficiency of rapid detection.

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