A microgrid power protection device

Abstract

The utility model relates to a kind of microgrid power protection device, 6-way ac and 6-way dc voltage and current signals can be monitored in real time, and the monitoring and management of microgrid power is realized through 485 or CAN communication, which plays the role of protection device. It includes 24V power supply, 4-inch capacitive touch screen, multiple digital signal output terminals, four 485 communication ports, one CAN communication port, group 1 and group 2 ac voltage and current input terminals, DC 1-6-way voltage detection terminals and corresponding current input terminals and other components, and each component cooperates with each other, which can meet the monitoring needs of multiple ac and dc, and can easily check and set the parameters of the equipment on site and connect with other peripherals.

Description

Technical Field

[0001] This utility model relates to the field of power protection device technology, specifically to a device for microgrid power monitoring and protection. Background Technology

[0002] With the continuous development of power systems, the requirements for monitoring and protecting microgrid power are increasing. Existing power monitoring devices have many shortcomings, with relatively limited functions, and cannot meet the comprehensive needs of multi-channel AC and DC power monitoring in practical applications.

[0003] In the prior art, Chinese utility model patent application number 201520151917.1 discloses a low-voltage AC power grid online monitoring device. This device uses a resistor voltage divider module with high-power resistors in series to obtain AC power grid voltage and current. Therefore, in terms of current measurement, the series resistors will generate serious heat when the current is high, so it cannot be used in high-current applications. Moreover, this device intelligently monitors AC power. The device of this patent uses a current transformer to monitor current, which can monitor high current and also play an isolation role, making it safer. This patent can also measure the voltage and current of DC power. Utility Model Content

[0004] The present invention aims to address the shortcomings of the prior art by providing a microgrid power protection device capable of simultaneously monitoring multiple AC and DC power sources and applicable to high-current applications.

[0005] The innovation of this microgrid power protection device lies in its unique component connection method and layout design. By using a 24V power input as the core power source, and electrically connecting it to various monitoring input terminals, signal output terminals, and communication interfaces, a highly efficient, stable, and powerful microgrid power monitoring system is constructed.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: A microgrid power protection device is provided, mainly comprising: a 24V power supply for powering the entire system; a 4-inch capacitive touchscreen electrically connected to the 24V power supply for displaying various power parameter values; two DO outputs (one, two, and four) all electrically connected to the 24V power supply for outputting digital signals; four 485 communication ports, twelve UI inputs, four DO outputs, and six UI inputs all electrically connected to the 24V power supply for communication with other 485 communication devices; four external DC current inputs, a group 1 AC voltage and current input terminal, a group 2 AC voltage and current input terminal, and DC voltage detection terminals 3-6 all electrically connected to the 24V power supply for monitoring the current values ​​of the four external DC currents; a DC 1 input / output terminal and a DC 2 input / output terminal both electrically connected to the 24V power supply for inputting analog or digital signals; and one CAN communication port electrically connected to the 24V power supply for communication with other CAN communication devices. The AC voltage and current input terminal of group 2 is electrically connected to the 24V power supply and is used to monitor the voltage and current values ​​of the AC power in group 2; the AC voltage and current input terminal of group 1 is electrically connected to the 24V power supply and is used to monitor the voltage and current values ​​of the AC power in group 1; the DC 3-6 channel voltage detection terminal is electrically connected to the 24V power supply and is used to monitor the voltage values ​​of the 4 external DC power supplies. The DC 2 input / output terminal is electrically connected to the 24V power supply to realize the input and output of one built-in DC power; the DC 1 input / output terminal is electrically connected to the 24V power supply (9) to realize the input and output of another built-in DC power. Among them, the current signals of the 6 AC power are connected through external transformers, and the voltage signals are directly connected; of the 6 DC power, the current signals of 2 built-in DC power are connected through transformers, the current signals of 4 external DC power are also connected through transformers, and the voltage signals are all directly connected.

[0007] As a further preferred embodiment, the output signal specifications of the two DO outputs (one), two DO outputs (two), and four DO outputs are the same. The two DO outputs, the two DO outputs, and the four DO outputs are electrically connected to the 4-inch capacitive touchscreen.

[0008] As a further preferred option, the communication protocols of the 4-channel 485 communication ports, 12-channel UI input, 4-channel DO output, and 6-channel UI input are consistent; The 4 485 communication ports, 12 UI inputs, 4 DO outputs, and 6 UI inputs are connected in parallel with the 1 CAN communication port.

[0009] As a further preferred embodiment, the AC voltage and current input terminals of Group 1 and Group 2 are both located on the same horizontal plane of the device.

[0010] As a further preferred embodiment, the DC 1 input / output terminal and the DC 2 input / output terminal are symmetrically distributed on both sides of the device; The DC 1 input / output terminal and the DC 2 input / output terminal are respectively electrically connected to the AC voltage and current input terminal of group 1, the AC voltage and current input terminal of group 2, the DC 3-6 channel voltage detection terminal, and the corresponding input terminal of the 4-channel external DC current input.

[0011] Compared with the prior art, the present invention has at least the following significant advantages: First, this invention can simultaneously monitor the voltage and current signals of 6 AC and 6 DC power sources in real time, meeting the monitoring needs of multiple AC and DC power sources, improving the monitoring efficiency and reliability of the power system, and providing strong support for the stable operation of the microgrid power system.

[0012] Secondly, this utility model uses a current transformer to monitor the current, which can monitor large currents and also provide isolation, making it safer. It effectively solves the problem of overheating caused by large currents in the prior art, expands the application range of the device in different power scenarios, and reduces safety hazards.

[0013] This utility model is equipped with a 4-inch capacitive touch screen, which facilitates on-site viewing and setting of equipment parameters, improves the convenience and intuitiveness of operation, reduces the complexity and error rate of manual operation, and enhances the user experience.

[0014] The connection method and layout design of each component of this utility model are reasonable. For example, the connection between the digital signal output terminal and the touch screen, the parallel connection of the communication interface, and the symmetrical distribution of the DC input and output terminals make the whole device perform well in signal transmission, data processing and operational stability, further improving the performance and practicality of the device.

[0015] Finally, this invention features four RS-485 communication ports, allowing for easy connection to other RS-485 communication peripherals, enhancing the device's communication capabilities, and enabling efficient information exchange with other devices. This contributes to building a more comprehensive microgrid power monitoring system and improves the intelligent management level of the power system. Simultaneously, it is also equipped with a CAN communication port, which can be used for high-speed and reliable data communication with other CAN communication devices, exhibiting strong anti-interference capabilities and real-time performance. Attached Figure Description

[0016] Figure 1 A front view of the structure of this utility model is shown; Figure 2A rear view of the structure of this utility model is shown.

[0017] The markings in the attached diagram are as follows: 1-2 DO outputs, 2-4-inch capacitive touchscreen, 3-6 UI inputs, 4-4 485 communication ports, 5-4 external DC current inputs, 6-2 DO outputs, 7-12 UI inputs, 8-4 DO outputs, 9-24V power input, 10-1 CAN communication port, 11-Group 2 AC voltage and current input terminals, 12-Group 1 AC voltage and current input terminals, 13-DC 3-6 voltage detection terminals, 14-DC 2 input / output terminals, 15-DC 1 input / output terminals. Detailed Implementation

[0018] The preferred embodiments of this utility model will be described in detail below to provide a clearer understanding of its purpose, features, and advantages. It should be understood that the following embodiments are not intended to limit the scope of this utility model, but are merely illustrative of its essential spirit.

[0019] In the following description, certain specific details are set forth for the purpose of illustrating various disclosed embodiments in order to provide a thorough understanding of the various disclosed embodiments. However, those skilled in the art will recognize that embodiments may be practiced without one or more of these specific details. In other instances, well-known techniques associated with this application may not have been shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.

[0020] Throughout this specification, references to "an embodiment" or "an embodiment" indicate that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Therefore, the appearance of "in an embodiment" or "in an embodiment" in various places throughout the specification does not necessarily refer to the same embodiment. Furthermore, a particular feature, structure, or characteristic may be combined in any way in one or more embodiments.

[0021] like Figure 1 and Figure 2 As shown, the microgrid power protection device provided by this utility model mainly consists of the following components: 24V power input 9: serving as the power source for the entire device, providing a stable 24V voltage to other components, and ensuring the normal operation of the device.

[0022] 4-inch capacitive touchscreen 2: Connects to a 24V power input 9. It features a user-friendly interface and simple operation, and can intuitively display various power parameter values, including but not limited to voltage, current, and power. This allows staff to quickly understand the operating status of the power system on-site and directly set and adjust the device parameters on the touchscreen.

[0023] Two DO outputs (1), two DO outputs (6), and four DO outputs (8) are all electrically connected to the 24V power input (9) and are used to output digital signals. They can be connected to external control equipment, alarm devices, etc., to realize remote monitoring and automated control of the power system's operating status. For example, when abnormal power parameters are detected, an alarm signal can be sent through the digital signal output terminal to trigger an external alarm device and promptly remind staff to handle the situation.

[0024] Four 485 communication ports: All are electrically connected to a 24V power input and follow the same 485 communication protocol. They can easily transmit data with other 485 communication devices to achieve information sharing and collaborative work. For example, they can be connected to a host computer, data acquisition terminal and other devices to upload the monitored power data to the monitoring center and receive instructions issued by the monitoring center to achieve centralized management and remote control of the power system.

[0025] Four external DC current inputs 5: all are electrically connected to the 24V power input 9. They are connected to the current signals of the four external DC currents through current transformers. The use of current transformers can effectively isolate high-voltage DC current, ensuring the safety of the device and personnel, and can accurately monitor large current signals. It is suitable for various DC power supply systems of different specifications, improving the versatility and adaptability of the device.

[0026] 12 UI inputs 7: All are electrically connected to 24V power input 9, which can flexibly receive analog or digital signals, meet the access requirements of different types of sensors and monitoring equipment, realize the comprehensive acquisition and processing of various analog and digital quantities in the power system, and provide rich data support for the comprehensive monitoring and analysis of the power system.

[0027] 1 CAN communication port 10: Electrically connected to 24V power input 9, enabling high-speed and reliable data communication with other CAN communication devices. CAN communication has strong anti-interference capabilities and real-time performance, making it particularly suitable for collaborative work and information exchange between multiple devices in a microgrid power system, ensuring the stable operation of the power system and the accuracy of data transmission.

[0028] Group 2 AC voltage and current input terminal 11: Electrically connected to 24V power input 9, used to input the voltage and current signals of the 3-phase AC power of Group 2. The voltage signal is directly input, and the current signal is input through an external current transformer to realize accurate monitoring of the AC power of this group, timely capture abnormal changes in voltage and current, and provide a basis for the protection and control of AC power system.

[0029] Group 1 AC voltage and current input terminal 12: Electrically connected to 24V power input 9, used to input the voltage and current signals of the 3-phase AC power of Group 1. It adopts the same connection method as Group 2 AC voltage and current input terminal 11, and together they complete the comprehensive monitoring of 6 AC power channels to ensure the safe and reliable operation of the AC power system.

[0030] DC 3-6 channel voltage detection terminal 13: Electrically connected to 24V power input 9, used to detect the voltage values ​​of 4 external DC power supplies. Directly connected to the voltage signal, it can obtain the voltage information of the external DC power supply in real time and accurately, so as to effectively monitor and manage the DC power system, promptly detect voltage abnormalities and take corresponding measures.

[0031] DC 2 input / output terminal 14: Electrically connected to 24V power input 9, used to realize the input and output of one built-in DC power. The current signal is connected through a current transformer. It is symmetrically arranged on one side of the device for easy connection with the internal DC power system to realize the transmission and distribution of DC power, while also facilitating heat dissipation and maintenance.

[0032] DC 1 input / output terminal 15: Electrically connected to 24V power input 9, used to realize the input and output of another built-in DC power. It is symmetrically distributed on both sides of the device with DC 2 input / output terminal 14. This symmetrical design helps to balance the internal electrical layout of the device, improve the stability and reliability of the device, and ensure the normal transmission and use of the two built-in DC power.

[0033] The connection relationships are as follows: The 24V power input 9 provides power to the entire system and is horizontally and fixedly connected to two DO outputs (1), two DO outputs (6), and four DO outputs (8). Simultaneously, the 24V power input 9 is electrically connected to four 485 communication ports (4), twelve UI inputs (7), four DO outputs (8), and six UI inputs (3). Furthermore, the 24V power input 9 is also fixedly connected to four external DC current inputs (5) located at the front, and to the group 2 AC voltage and current input terminals (11), group 1 AC voltage and current input terminals (12), and DC voltage detection terminals (13) located on the same side at the rear. It is also fixedly connected to one CAN communication port (10) located at the top, and to the DC 1 input / output terminal (15) and DC 2 input / output terminal (14) located in the center of the panel.

[0034] The output signals of the two DO outputs (1), two DO outputs (6), and four DO outputs (8) have the same specifications and are all electrically connected to the 4-inch capacitive touchscreen (2). The communication protocols of the four 485 communication ports (4), twelve UI inputs (7), four DO outputs (8), and six UI inputs (3) are consistent and are connected in parallel with the one CAN communication port (10). The AC voltage and current input terminals 12 (Group 1) and 11 (Group 2) are both located on the same horizontal plane of the device. The DC input / output terminals 15 (Group 1) and 14 (Group 2) are symmetrically distributed on both sides of the device and are electrically connected to the corresponding input terminals of the AC voltage and current input terminals 12 (Group 1), 11 (Group 2), the DC voltage detection terminals 13 (Groups 3-6), and the four external DC current input terminals (5).

[0035] Its structural relationship is as follows: The 24V power input 9 serves as the core power source, and is electrically connected to various monitoring input terminals, signal output terminals, and communication interfaces to build an efficient, stable, and powerful microgrid power monitoring system.

[0036] Group 1 AC voltage and current input terminal 12 and Group 2 AC voltage and current input terminal 11 are located on the same horizontal plane of the device, which facilitates the connection of AC voltage and current signals.

[0037] The DC 1 input / output terminal 15 and the DC 2 input / output terminal 14 are symmetrically distributed on both sides of the device, which helps to balance the internal electrical layout of the device and improve the stability and reliability of the device.

[0038] Its working principle is as follows: The 24V power input 9 provides a stable 24V voltage for the entire device, ensuring its normal operation.

[0039] The current signals of the 6 AC current channels are connected to the AC voltage and current input terminals 12 of group 1 and AC voltage and current input terminals 11 of group 2 through external current transformers, while the voltage signals are directly connected. Among the 6 DC current channels, the current signals of the 2 built-in DC current channels are connected to the DC 1 input / output terminal 15 and DC 2 input / output terminal 14 through current transformers, and the current signals of the 4 external DC current channels are also connected to the 4 external DC current input terminals 5 through current transformers. The voltage signals are all directly connected to the corresponding input terminals.

[0040] The 4-inch capacitive touchscreen displays various power parameters in real time and receives operation commands to set and adjust the device's parameters.

[0041] The two DO outputs (1), two DO outputs (6), and four DO outputs (8) output corresponding digital signals according to the device's operating status and set parameters. These signals can be connected to external control equipment, alarm devices, etc., to achieve remote monitoring and automated control of the power system's operating status.

[0042] The 4-channel 485 communication port 4, 12-channel UI input 7, 4-channel DO output 8 and 6-channel UI input 3 follow the same communication protocol and are connected in parallel with the 1-channel CAN communication port 10. This allows for convenient data transmission with other 485 communication devices and CAN communication devices, enabling information sharing and collaborative work.

[0043] In practical applications, staff can view various parameters of the power system in real time via a 4-inch capacitive touchscreen, such as the voltage, current, and power factor of each AC and DC power supply, as well as the device's operating status and fault alarm information. When adjustments to the power system's operating parameters are needed, simple operations on the touchscreen are sufficient to complete the parameter settings, and the adjusted parameters are sent to the corresponding control equipment via the digital signal output terminal, achieving precise control of the power system. Simultaneously, the device interacts with other devices via its RS-485 and CAN communication ports, uploading monitored power data to the monitoring center and receiving instructions from the monitoring center, enabling centralized monitoring and intelligent management of the entire microgrid power system.

[0044] This utility model's microgrid power protection device has multi-channel AC / DC monitoring function, uses current transformers to monitor current, is safe and reliable, is equipped with a touch screen for convenient on-site operation, and has multiple communication interfaces for easy connection with other devices. It can meet the real-time monitoring and protection needs of multi-channel AC / DC in microgrid power systems, effectively improve the operating efficiency and safety of power systems, and has high practical value and market application prospects.

[0045] The system features a workflow where software and hardware work together seamlessly. A 24V power input (9) provides power to the entire system. A 4-inch capacitive touchscreen (2) displays various power parameters in real time. Two DO outputs (1), two DO outputs (2), and four DO outputs (8) are used for digital signal output. Four 485 communication ports (4) are used for 485 communication devices. Four external DC current inputs are used to monitor the current values ​​of four external DC power sources. Twelve UI inputs (7) are used for analog or digital signal input. One CAN communication port (10) can connect to CAN communication devices. Group 2 AC voltage and current input terminals (11) and Group 1 AC voltage and current input terminals (12) are used to monitor AC voltage and current values. DC voltage detection terminals (13) from channel 3 to channel 6 are used to monitor the voltage values ​​of four external DC power sources. DC input / output terminals (14) and DC input / output terminals (15) are used for the input and output of two internal DC power sources.

[0046] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A microgrid power protection device, characterized in that, include: A 24V power input (9) and a 4-inch capacitive touch screen (2) are electrically connected to the 24V power input (9); The 24V power input (9) is horizontally and fixedly connected to 2 DO outputs (1), 2 DO outputs (6), and 4 DO outputs (8); The 24V power input (9), 4 485 communication ports (4), 12 UI inputs (7), 4 DO outputs (8) and 6 UI inputs (3) are all electrically and fixedly connected to the 24V power supply (9); The 24V power input (9) is fixedly connected to the four external DC current inputs (5) located at the front, and the AC voltage and current input terminals (11), AC voltage and current input terminals (12), and DC voltage detection terminals (13) located on the same side at the rear. The 24V power input (9) is fixedly connected to the 1-channel CAN communication port (10) located above; The 24V power input (9) is connected to the DC 1 input / output terminal (15) and DC 2 input / output terminal (14) located in the middle of the panel.

2. The microgrid power protection device according to claim 1, characterized in that, The output signal specifications of the two DO outputs (1), two DO outputs (6), and four DO outputs (8) are the same.

3. The microgrid power protection device according to claim 1, characterized in that, The communication protocols of the four 485 communication ports (4), the twelve UI inputs (7), the four DO outputs (8), and the six UI inputs (3) are consistent.

4. A microgrid power protection device according to claim 1, characterized in that, The DC 1 input / output terminal (15) and the DC 2 input / output terminal (14) are symmetrically distributed on both sides of the device.

5. A microgrid power protection device according to claim 1, characterized in that, The AC voltage and current input terminals (12) of Group 1 and the AC voltage and current input terminals (11) of Group 2 are both located on the same horizontal plane of the device.

6. A microgrid power protection device according to claim 1 or 2, characterized in that, The 4-inch capacitive touch screen (2) is electrically connected to the 2-channel DO output one (1), the 2-channel DO output two (6), and the 4-channel DO output (8).

7. A microgrid power protection device according to claim 1, characterized in that, The 1-channel CAN communication port (10) is connected in parallel with the 4-channel 485 communication port (4), the 12-channel UI input (7), the 4-channel DO output (8), and the 6-channel UI input (3).

8. A microgrid power protection device according to claim 1 or 4, characterized in that, The DC 1 input / output terminal (15) and DC 2 input / output terminal (14) are respectively electrically connected to the corresponding input terminals of the group 1 AC voltage and current input terminal (12), the group 2 AC voltage and current input terminal (11), the DC 3-6 channel voltage detection terminal (13), and the 4 channel external DC current input terminal (5).

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