Novel distributed power supply access unit device

Abstract

The utility model relates to the technical field of distributed power supplies, in particular to a novel distributed power supply access unit device. The distributed power supply access unit device comprises a main board and a power supply unit, wherein the main board is connected with a power supply board. The power panel comprises an ACDC module, a DCDC module and a voltage sampling module; the mainboard comprises a carrier module, a Bluetooth module, an encryption module, an MCU, a storage module, a clock chip and a communication circuit module; the communication circuit module comprises a plurality of 485 circuits which are connected in parallel, the 485 circuits are connected with a plurality of external inverters, and the 485 circuits are connected with the MCU at the same time. According to the distributed power supply access unit, the 12V power supply circuit is independently designed, and ripple waves are reduced by 95% compared with a traditional 12V power supply circuit under various load conditions.

Description

Technical Field

[0001] The utility model belongs to the technical field of distributed power supply, and in particular relates to a novel distributed power supply access unit device. Background Art

[0002] Traditional photovoltaic protocol converters have a single function and require an external adapter to control photovoltaic inverters. Each set of equipment can only control one photovoltaic inverter. In the case of a large number of inverters in the substation and complex brands, multiple sets of equipment are required to achieve full control, which not only increases the cost of use but also increases the complexity of control. On the other hand, traditional photovoltaic protocol converters cannot provide real-time feedback on the mains voltage status to the substation terminal, resulting in the substation terminal being unable to handle possible voltage fluctuations in a timely manner. When facing the interchange of modules between different manufacturers, the ripple processing of the 12V power supply is poor, which can easily cause damage to the module.

[0003] Based on solving the above problems, this paper proposes a new distributed power access unit to solve the problems of single function of traditional protocol converter, small number of controlled inverters, inability to collect AC voltage in real time, large 12V power ripple, etc. The new distributed power access unit proposed in this paper can monitor the voltage of the substation, communicate with the substation wirelessly or wired, and control three inverters at the same time. It is compatible with inverter manufacturers such as Huawei, Sungrow, and Jinlong. It can read inverter voltage, current, active power, reactive power and other parameters to control the working status of the inverter. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a new type of distributed power supply access unit device to solve the above shortcomings. The utility model adopts the following technical solutions:

[0005] A novel distributed power access unit device includes a power board, a main board and a communication circuit module, wherein the power board and the communication circuit module are connected to the main board, the main board includes a carrier module, and the novel power supply module used by the carrier module includes a rectifier bridge, a compensation circuit, a high-voltage MOS tube, a transformer, a filter circuit, a feedback circuit, an LDO circuit, a magnetic bead and a filter capacitor;

[0006] The rectifier bridge is connected to the input end of the compensation circuit, and the output end of the compensation circuit is connected to the drain of the high-voltage MOS;

[0007] The transformer input end is connected to the source of the high-voltage MOS, the feedback circuit output end is connected to the gate of the high-voltage MOS, and the transformer output end is connected to the filter circuit input end;

[0008] The output end of the filter circuit is connected to the input end of the LDO circuit and the input end of the feedback circuit. The output end of the LDO circuit is connected to a magnetic bead, and the other end of the magnetic bead is connected to a filter capacitor.

[0009] Furthermore, the voltage sampling module in the power board of the utility model includes a height sampling resistor, a PT and a metering circuit;

[0010] One end of the height sampling resistor is connected to the PT, and the other end is connected to an external AC220V power supply;

[0011] The other end of the PT is connected to a metering circuit;

[0012] Furthermore, the metering circuit of the utility model is provided with a 3.3V voltage source by a DCDC module, and is connected to the MCU in the mainboard via an SPI interface.

[0013] Furthermore, the communication circuit module of the utility model includes multiple 485 circuits in parallel, the multiple 485 circuits are connected to the MCU at the same time, and the multiple 485 circuits are correspondingly connected to multiple external inverter modules.

[0014] Furthermore, the inverter module of the utility model includes an inverter and a 4G acquisition stick.

[0015] The utility model adopts the above solution, which has the following beneficial effects compared with the prior art:

[0016] 1. The utility model solves the problems of single function of traditional protocol converter, small number of controlled inverters, inability to collect mains voltage in real time, large 12V power ripple, etc. through multi-channel 485 communication circuits. In particular, a single set of equipment can control three different inverters, which reduces the management cost of the substation and improves the management efficiency of the substation. The processing of 12V power ripple improves the adaptability and interchangeability between the equipment and modules of various manufacturers.

[0017] 2. The utility model can be widely used in photovoltaic power generation sites and various new energy vehicle charging stations, which can reasonably allocate power resources and reduce the risks and pressures of the power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0019] In the figure:

[0020] Figure 1 This is a schematic diagram of the structure of a new distributed power access unit according to an embodiment of the utility model;

[0021] Figure 2This is a schematic diagram of the voltage sampling circuit structure of an embodiment of the utility model;

[0022] Figure 3 This is a schematic diagram of the 12V power supply circuit structure of an embodiment of the utility model;

[0023] Figure 4 This is a schematic diagram of the 12V power supply circuit structure of the traditional protocol converter;

[0024] Figure 5 This is a schematic diagram of the ripple test results of the traditional 12V power supply circuit;

[0025] Figure 6 This is a schematic diagram of the improved converter 12V power supply circuit structure;

[0026] Figure 7 To improve the ripple test results of the 12V power supply circuit;

[0027] Figure 8 This is a schematic diagram of the ripple test results of the new 12V power supply circuit. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. In the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] like Figure 1 The distributed power access unit in the embodiment of the utility model shown includes a main board, a power board and a communication module, and the power board and the communication module are connected to the main board; wherein the power board includes an ACDC module, a DCDC module and a voltage sampling module;

[0030] The ACDC module input terminal is connected to an external AC220V power supply, and the 12V voltage output terminal is connected to the DCDC module; the DCDC module converts 12V direct current into 3.3V direct current to power the mainboard.

[0031] The mainboard includes carrier module, Bluetooth module, encryption module, MCU, storage module and clock chip;

[0032] The MCU uses GD32F460 as the main processor. Architecture -M4 core has a fast main frequency and rich serial port and SPI resources to meet the external communication, control and monitoring requirements of distributed power access units.

[0033] The carrier module, Bluetooth module, encryption module, storage module, clock chip, and communication circuit module are all connected to the MCU; the communication circuit module includes six parallel 485 circuits, and the parallel 485 circuits are connected to three inverters of different models, different powers, and different communication methods.

[0034] The inverters specifically include Huawei SUN2000 series inverters that support different output powers of 485 communications, GoodWe GW3000-XS system inverters that support different output powers of WiFi communications and 485 communications, and various inverters such as Suntech Power and Growatt.

[0035] The carrier circuit can communicate upward through the power line, allowing the power master station to understand the power line information and photovoltaic power generation status in real time; the Bluetooth circuit supports staff to debug, maintain and upgrade it with handheld devices, greatly reducing the operation and maintenance costs of the equipment.

[0036] like Figure 2 The schematic diagram of the structure of the voltage sampling module in the embodiment of the utility model is shown, and the voltage sampling module includes a high-precision sampling resistor, a PT and a metering circuit; one end of the high-precision sampling resistor is connected to the PT, and the other end is connected to an external AC220V power supply; the other end of the PT is connected to the metering circuit; the metering circuit is provided with a 3.3V voltage source by the DCDC module, and is connected to the MCU in the mainboard through the SPI interface.

[0037] After passing through the voltage transformer PT, the voltage value is controlled within the voltage range that the metering chip can sample. The voltage metering circuit is mainly composed of a metering chip, a crystal oscillator and its peripheral circuits. The metering chip is used here instead of an op amp circuit to use the ADC sampling of the MCU because the sampling accuracy of the metering chip is higher. The sampling accuracy of the metering circuit can reach 1%, which can monitor the line voltage more accurately.

[0038] like Figure 3 The new 12V power supply circuit module used in the carrier module in the embodiment of the utility model shown in the figure includes a rectifier bridge, a compensation circuit, a high-voltage MOS tube, a transformer, a filter circuit, a feedback circuit, an LDO circuit, a magnetic bead and a filter capacitor;

[0039] The rectifier bridge is connected to the input end of the compensation circuit; the output end of the compensation circuit is connected to the input end of the primary side of the transformer, the output end of the primary side is connected to the source of the MOS tube, and the output end of the feedback circuit is connected to the gate of the MOS tube;

[0040] The output end of the transformer is connected to the input end of the filter circuit; the output end of the filter circuit is connected to the input end of the LDO circuit and the input end of the feedback circuit; the output end of the LDO circuit is connected to a magnetic bead; and the other end of the magnetic bead is connected to a filter capacitor.

[0041] The new distributed power access unit uses a new 12V power supply circuit to power the carrier module. When the load is 125mA, the 12V ripple peak value is below 12mV. The traditional photovoltaic protocol converter 12V power supply circuit does not do any ripple processing. The schematic diagram of its 12V power supply circuit is as follows: Figure 4 As shown in the figure, the AC power is converted into 12V DC after passing through the rectifier bridge, compensation circuit, high-voltage MOS, transformer, and filter circuit, and the output voltage can be stabilized at 12V by adjusting the MOS tube through the feedback circuit. This circuit does not add any circuit to reduce the ripple at the 12V power supply of the carrier module. The measured ripple of the circuit is as follows Figure 5 shown. Figure 5 The 12V circuit ripple test results show that (a) is the circuit ripple when the circuit is unloaded, (b) is the circuit ripple when the circuit is loaded with 50mA, and (c) is the circuit ripple when the circuit is loaded with 125mA. It can be seen that the peak-to-peak values ​​of the ripples in the circuit when the circuit is unloaded, loaded with 50mA, and loaded with 125mA are 120mV, 106mV, and 90mV respectively, and the peak-to-peak value of the ripples is about 1% of 12V.

[0042] Based on the 12V power supply circuit of the traditional photovoltaic protocol converter, magnetic beads, 100nF, 10nF, and 10pF filter capacitors are added to the 12V power supply of the carrier module to reduce the ripple of the 12V power supply. The circuit is as follows Figure 6 The measured ripple of the improved 12V power supply circuit is shown in Figure 7 shown. Figure 7 (a) is the circuit ripple of the improved 12V power supply circuit when it is no-loaded, (b) is the circuit ripple of the improved 12V power supply circuit when it is loaded with 50mA, and (c) is the circuit ripple of the improved 12V power supply circuit when it is loaded with 125mA. The peak-to-peak values ​​of the circuit ripple are 72mV, 40mV, and 35.2mV, respectively, which are significantly reduced compared to the traditional 12V power supply circuit.

[0043] The new distributed power access unit has designed a new 12V power supply ripple processing circuit. On the basis of the improved 12V power supply circuit, the transformer output voltage is appropriately raised, and then the LDO circuit is added to reduce the ripple. The ripple test results of the new 12V power supply circuit are as follows: Figure 8 As shown, Figure 8(a) is to improve the circuit ripple of the 12V power supply circuit when it is not loaded, (b) is to improve the circuit ripple of the 12V power supply circuit when it is not loaded, and (c) is to improve the circuit ripple of the 12V power supply circuit when it is not loaded. The peak-to-peak value of the ripple is 2.2mV when it is not loaded, the peak-to-peak value of the ripple is 3.4mV when it is not loaded, and the peak-to-peak value of the ripple is 4.04mV when it is not loaded. The peak-to-peak value of the ripple is less than 12mV, which is one thousandth of 12V, which is greatly reduced compared with the ripple of the first two circuits.

[0044] Table 1 compares and analyzes the test results of the ripple of three 12V power supply circuits. From Table 1, we can see that the ripple of the new 12V power supply circuit is much less than that of the traditional circuit and the improved circuit, whether it is no-load or loaded. The ripple of the new circuit is reduced by more than 95% compared with the traditional circuit, reaching the 1% standard of 12V.

[0045] Table 1

[0046]

[0047] In summary, the utility model relates to the field of distributed power supply technology, and in particular to a new type of distributed power supply access unit device. The distributed power supply access unit device includes a main board and a power supply unit, and the main board is connected to the power board. The power board includes an ACDC module, a DCDC module and a voltage sampling module; the main board includes a carrier module, a Bluetooth module, an encryption module, an MCU, a storage module, a clock chip, and a communication circuit module; the communication circuit module includes multiple 485 circuits in parallel, and the multiple 485 circuits are connected to several external inverters, and the multiple 485 circuits are connected to the MCU at the same time. The distributed power supply access unit independently designs a 12V power supply circuit, and the ripple is reduced by 95% compared with the traditional 12V power supply circuit under various load conditions.

[0048] The new distributed power access unit proposed by the utility model solves the problems of single function of traditional protocol converter, small number of inverters, inability to collect mains voltage in real time, large 12V power ripple, etc., especially a single set of equipment can control three different inverters, which reduces the management cost of the substation and improves the management efficiency of the substation. The processing of 12V power ripple improves the compatibility and interchangeability between the equipment and modules of various manufacturers. The new distributed power access unit can be widely used in photovoltaic power generation sites and various new energy vehicle charging stations, which can reasonably allocate power resources and reduce the risk and pressure of the power grid.

[0049] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0050] Each embodiment in this specification is described in a related manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0051] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A new type of distributed power access unit device, including a power board, a main board and a communication circuit module, wherein the power board and the communication circuit module are connected to the main board, and the main board includes a carrier module, characterized in that: The new power supply module used in the carrier module includes a rectifier bridge, a compensation circuit, a high-voltage MOS tube, a transformer, a filter circuit, a feedback circuit, an LDO circuit, magnetic beads and a filter capacitor; The rectifier bridge is connected to the input end of the compensation circuit, and the output end of the compensation circuit is connected to the drain of the high-voltage MOS; The transformer input end is connected to the source of the high-voltage MOS, the feedback circuit output end is connected to the gate of the high-voltage MOS, and the transformer output end is connected to the filter circuit input end; The output end of the filter circuit is connected to the input end of the LDO circuit and the input end of the feedback circuit. The output end of the LDO circuit is connected to a magnetic bead, and the other end of the magnetic bead is connected to a filter capacitor.

2. A new type of distributed power access unit device according to claim 1, characterized in that: The voltage sampling module in the power board includes a height sampling resistor, a PT and a metering circuit; One end of the height sampling resistor is connected to the PT, and the other end is connected to an external AC220V power supply; The other end of the PT is connected to a metering circuit.

3. A new type of distributed power supply access unit device according to claim 2, characterized in that: The metering circuit is provided with a 3.3V voltage source by a DCDC module and is connected to the MCU in the mainboard through an SPI interface.

4. A new type of distributed power supply access unit device according to claim 1, characterized in that: The communication circuit module includes multiple 485 circuits in parallel, the multiple 485 circuits are connected to the MCU at the same time, and the multiple 485 circuits are correspondingly connected to multiple external inverter modules.

5. A new type of distributed power access unit device according to claim 4, characterized in that: The inverter module includes an inverter and a 4G acquisition stick.

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