High-power direct-current bus coupler electronic switch system

Abstract

The utility model relates to a high-power direct-current bus tie electronic switch system, which comprises a first direct-current bus, a second direct-current bus, a high-frequency isolation transformer, a detection system, a monitoring system and a communication system, and is characterized in that the high-frequency isolation transformer is connected between the first direct-current bus and the second direct-current bus; the detection system is used for realizing fault isolation between buses and detecting that loops do not influence each other, the detection system is used for detecting and comparing the voltage of the first direct current bus and the voltage of the second direct current bus, and the monitoring system is used for judging whether a parallel connection technical requirement is met or not according to a detection result. And the communication system is used for receiving a background control instruction and executing parallel connection operation between the direct current buses. The application has the effect of improving the reliability and safety of the system.

Description

Technical Field

[0001] This application relates to the technical field of bus switching in DC power distribution systems, and in particular to a soft-start circuit system and control method. Background Technology

[0002] With the development of the energy internet, hybrid AC / DC distribution networks are gradually becoming an important part of the future power grid. This new network structure can effectively adapt to the integration of new energy sources, distributed energy storage, and charging / swapping facilities, improving energy utilization efficiency and power supply reliability. Especially in low-voltage DC distribution systems, the connection of DC buses can achieve multi-energy complementarity and energy mutual assistance, further enhancing the system's flexibility and stability.

[0003] Currently, common methods for resolving DC bus parallel connection issues include using traditional mechanical circuit breakers, contactors, and simple electronic switches. These methods primarily establish the physical connection between DC buses, ensuring current flow. Specifically, mechanical circuit breakers can close and open the bus manually or electrically; contactors use electromagnetic force to drive contact closure for rapid response; and simple electronic switches utilize semiconductor devices to conduct and cut off current. In addition, some systems are equipped with basic voltage detection functions to preliminarily determine the voltage status of the bus.

[0004] However, existing technologies have significant shortcomings. First, they lack precise monitoring of the DC bus voltage, failing to guarantee that the voltage difference between the two bus sections during parallel connection remains within a safe range, potentially leading to equipment damage or system failure. Second, these methods cannot achieve scientific voltage regulation during parallel connection, resulting in unstable system operation. Third, the lack of remote or automated control functions necessitates manual operation on-site, increasing maintenance costs and safety hazards. Finally, these traditional parallel connection methods are prone to arcing, leading to safety accidents and potentially interfering with the normal operation of other monitoring equipment. Therefore, a new type of DC bus tie electronic switch system that overcomes these deficiencies is urgently needed. Utility Model Content

[0005] To improve the reliability and safety of the system, this application provides a high-power DC bus tie electronic switch system.

[0006] The high-power DC bus tie electronic switch system provided in this application adopts the following technical solution:

[0007] A high-power DC bus interconnection electronic switch system includes a first DC bus, a second DC bus, a high-frequency isolation transformer, a detection system, a monitoring system, and a communication system. The high-frequency isolation transformer is connected between the first DC bus and the second DC bus to achieve fault isolation between the buses and prevent the detection circuits from interfering with each other. The detection system is used to detect and compare the voltages of the first DC bus and the second DC bus. The monitoring system is used to determine whether the technical requirements for parallel connection are met based on the detection results. The communication system is used to receive background control commands and execute the parallel connection operation between the DC buses.

[0008] By adopting the above technical solution, the high-frequency isolation transformer is connected between the first DC bus and the second DC bus. This effectively isolates faults such as short circuits or reduced insulation on either bus, ensuring the normal operation of the other bus and preventing the entire system from being paralyzed due to a single point of failure. It not only achieves physical isolation but also ensures that the detection circuits of adjacent bus sections do not interfere with each other, improving detection accuracy and reliability. The detection system uses voltage sensors installed on the first and second DC buses to collect the voltage values ​​of each bus in real time and compares them using a comparison circuit. This accurately determines whether the voltages of the two bus sections meet the parallel connection conditions, ensuring the safety and stability of the parallel connection process. Based on the data from the detection system, the monitoring system uses a central processing unit for processing and analysis, generating control commands according to preset parallel connection conditions and technical parameters. This enables intelligent monitoring and management of the parallel connection operation, improving the system's automation level.

[0009] Optionally, a self-test module is also included. The self-test module is used to perform a self-test when powered on. When an external wiring error or a device malfunction occurs, the self-test module automatically protects the device and issues an alarm message. After the fault is cleared, the device automatically resumes operation.

[0010] By adopting the above technical solution, a comprehensive self-test can be performed on the device upon power-up, ensuring that the device is in a good initial state. When external wiring errors or device malfunctions occur, the self-test module can promptly identify the problem and take protective measures to prevent safety accidents caused by misoperation. Simultaneously, the self-test module will issue alarm messages to remind maintenance personnel to handle the fault promptly. Once the fault is cleared, the device can automatically resume normal operation, reducing the need for human intervention and improving the reliability and stability of the system.

[0011] Optionally, the self-test module is also used to continuously self-test internal key components, including AC / DC relays, power electronic devices, surge protection devices, and fans. If an abnormality is found during self-test at any time, the self-test module will stop the device from working and issue an alarm message. After the abnormality is eliminated, the device will automatically resume working.

[0012] By adopting the above technical solution, continuous self-testing of internal key components can be achieved, ensuring the stability and safety of the system. Specifically, the self-test module can monitor key components such as AC / DC relays, power electronic devices, surge protection devices, and fans in real time. If any abnormality is detected in these key components at any time, the self-test module will immediately take measures to stop the device from operating and issue an alarm message to prevent safety accidents caused by faults. Simultaneously, once the abnormality is resolved, the self-test module can automatically restore the device to its normal operating state, ensuring the continuity and reliability of the system. This design not only improves the system's self-protection capabilities but also facilitates the timely detection and handling of potential faults, thereby extending the device's service life.

[0013] Optionally, a protection module may also be included, which is used to implement DC overcurrent protection, over / under voltage protection, over-temperature protection, bus insulation monitoring, and lightning protection failure early warning.

[0014] By adopting the above technical solutions, not only can efficient DC bus parallel connection be achieved, but the safety and reliability of the system can also be effectively improved.

[0015] Optionally, the turns ratio of the high-frequency isolation transformer is 1:1.

[0016] By adopting the above technical solution, the turns ratio of the high-frequency isolation transformer is 1:1, ensuring a consistent voltage transmission ratio between the buses and effectively avoiding equipment damage and system instability caused by voltage ratio mismatch. At the same time, this design simplifies the system structure and improves the system's reliability and stability.

[0017] Optionally, the detection system includes a voltage sensor and a comparison circuit. The voltage sensor is installed on the first DC bus and the second DC bus respectively to detect their respective voltage values ​​in real time. The comparison circuit is used to compare the two voltage values ​​and generate a detection signal.

[0018] By adopting the above technical solution, real-time detection and comparison of the voltages of the first and second DC buses can be achieved, ensuring that the voltages of the two bus sections are within a safe range before parallel connection, thus avoiding safety accidents caused by excessive voltage differences. Simultaneously, this solution can generate detection signals in a timely manner, providing accurate data support for subsequent parallel connection operations and improving the reliability and safety of the system.

[0019] Optionally, the monitoring system includes a central processing unit and a memory. The central processing unit is used to process detection signals and generate control commands, and the memory is used to store preset connection conditions and technical parameters.

[0020] By adopting the above technical solution, the central processing unit can process the detection signals from the detection system in real time, ensuring timely and accurate judgment of the voltage status of the two DC bus sections, thereby generating corresponding control commands to guide the parallel connection operation of the DC bus. The memory stores preset parallel connection conditions and technical parameters, enabling the system to make reasonable decisions based on preset standards under different operating conditions, improving the system's intelligence level and operating efficiency.

[0021] Optionally, the communication system includes a wireless communication module and a wired communication module. The wireless communication module is used to communicate wirelessly with the background control system, and the wired communication module is used to communicate wiredly with the local control system.

[0022] By adopting the above technical solution and setting up wireless communication and wired communication modules, the system can flexibly select the communication method in different application scenarios. It supports both wireless communication with the background control system and wired communication with the local control system, thereby improving the applicability and reliability of the system.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. By using a high-frequency isolation transformer, fault isolation between busbars and the detection circuits are prevented from interfering with each other, ensuring that a fault in any section of the busbar does not affect the normal operation of another section of the busbar, thus improving the reliability and safety of the system;

[0025] 2. The detection system can detect and compare the voltage of two DC bus sections in real time. The monitoring system determines whether the technical requirements for parallel connection are met based on the detection results, thereby avoiding equipment damage or system failure caused by excessive voltage difference.

[0026] 3. The communication system can receive control commands from the background and execute parallel connection operations between DC buses, realizing remote or automated intelligent switching, reducing manual intervention, maintenance costs, and safety hazards. Attached Figure Description

[0027] Figure 1 This is a block diagram of a high-power DC bus tie electronic switch system according to an embodiment of this application.

[0028] Figure 2 This is a circuit diagram of a high-power DC bus tie electronic switch system according to an embodiment of this application. Detailed Implementation

[0029] The following is in conjunction with the appendix Figure 1-2 This application will be described in further detail.

[0030] This application discloses a high-power DC bus tie-in electronic switch system. (Refer to...) Figure 1 and Figure 2A high-power DC bus interconnection electronic switch system includes a first DC bus, a second DC bus, a high-frequency isolation transformer, a detection system, a monitoring system, and a communication system. The high-frequency isolation transformer is connected between the first and second DC buses to achieve fault isolation between the buses and prevent mutual interference between detection circuits. The detection system detects and compares the voltages of the first and second DC buses. The monitoring system determines whether the technical requirements for parallel connection are met based on the detection results. The communication system receives control commands from the backend and executes the parallel connection operation between the DC buses, effectively solving the aforementioned problems. Specifically, the high-frequency isolation transformer is connected between the first and second DC buses. The main function of the high-frequency isolation transformer is to achieve electrical isolation between the two bus sections and prevent fault propagation. The turns ratio of the high-frequency isolation transformer is typically 1:1, meaning the primary and secondary coils have the same number of turns, ensuring complete electrical isolation between the two bus sections. For example, a high-frequency isolation transformer using a ferrite core or a silicon steel core can be selected. Both core materials have good permeability and low loss characteristics, making them suitable for high-frequency applications. The detection system includes voltage sensors and a comparator circuit. Voltage sensors are installed on the first and second DC buses respectively to detect their respective voltage values ​​in real time. High-precision Hall effect sensors or resistive voltage dividers can be used. High-precision Hall effect sensors maintain high measurement accuracy under high voltage conditions, while resistive voltage dividers are simple and reliable. The comparator circuit compares the two voltage values ​​and generates a detection signal. The comparator circuit can use an operational amplifier circuit or a dedicated voltage comparator chip. Operational amplifier circuits offer the advantage of flexible adjustment of the comparison threshold, while dedicated voltage comparator chips offer high integration and low power consumption. The monitoring system includes a central processing unit (CPU) and a memory. The CPU processes the detection signal and generates control instructions, while the memory stores preset parallel connection conditions and technical parameters. The CPU can be a high-performance microcontroller, such as the ARM Cortex-M series, or an embedded computer, such as a Raspberry Pi. High-performance microcontrollers possess powerful data processing capabilities and low power consumption, making them suitable for embedded systems. Embedded computers offer even greater computing power and better scalability, making them suitable for complex data processing tasks. Memory, such as flash memory or SD cards, can be used to store preset connection conditions and technical parameters, such as voltage and temperature thresholds. The communication system includes wireless communication and wired communication modules. The wireless communication module, used for communication with the backend control system, can be a Wi-Fi module, a LoRa module, or a Zigbee module. Wi-Fi modules offer high-speed transmission and wide coverage, making them suitable for applications requiring large amounts of data transmission.LoRa modules offer advantages such as long-distance transmission and low power consumption, making them suitable for long-distance communication. Zigbee modules feature low power consumption and low latency, making them suitable for low-power applications. Wired communication modules are used for wired communication with the local control system and can use either an RS-485 interface or a CAN bus interface. The RS-485 interface has strong anti-interference capabilities, making it suitable for industrial environments. The CAN bus interface offers a reliable communication protocol and high transmission rate, making it suitable for real-time control applications. A self-test module performs a self-test upon power-up. If an external wiring error or a device malfunction occurs, the self-test module automatically protects the device and issues an alarm. After the fault is cleared, the device automatically resumes operation. Specifically, the self-test module includes a hardware self-test unit and a software self-test unit. The hardware self-test unit detects the status of external wiring and internal circuits, while the software self-test unit detects the operation of the system software. The hardware self-test unit can use a dedicated self-test chip, such as the ADuC7026, or a general-purpose microcontroller, such as the STM32F103. Dedicated self-test chips offer highly integrated self-testing capabilities, enabling rapid and accurate detection of various faults. General-purpose microcontrollers, on the other hand, offer greater programmability and flexibility, allowing for customized self-testing algorithms to meet specific needs. Software self-testing units can utilize built-in self-testing programs or external debugging tools. Built-in self-testing programs periodically check the system software's operational status, promptly identifying and fixing potential faults. External debugging tools provide more comprehensive self-testing capabilities, suitable for both development and testing phases.

[0031] The protection module is used to implement DC overcurrent protection, over / undervoltage protection, overtemperature protection, bus insulation monitoring, and lightning protection failure early warning. Specifically, the protection module includes an overcurrent protection unit, an over / undervoltage protection unit, an overtemperature protection unit, a bus insulation monitoring unit, and a lightning protection unit. The overcurrent protection unit detects the system current. When the current exceeds a set value, the protection module cuts off the power supply to prevent equipment damage caused by excessive current. The overcurrent protection unit can use a current transformer or a Hall effect current sensor. Current transformers are characterized by high accuracy and high reliability, suitable for high current detection. Hall effect current sensors are characterized by non-contact operation and fast response, suitable for high-frequency current detection. The over / undervoltage protection unit detects the system voltage. When the voltage exceeds a set range, the protection module cuts off the power supply to prevent equipment damage caused by excessively high or low voltage. The over / undervoltage protection unit can use a voltage sensor or a dedicated voltage protection chip. Voltage sensors are characterized by high accuracy and wide range, suitable for various voltage detections. Dedicated voltage protection chips have the advantages of high integration and low power consumption, suitable for miniaturized designs. The over-temperature protection unit detects the system temperature. When the temperature exceeds the set value, the protection module cuts off the power to prevent equipment damage caused by high temperatures. The over-temperature protection unit can use a thermistor or a temperature sensor. Thermistors are characterized by high sensitivity and fast response, suitable for rapid temperature detection. Temperature sensors, on the other hand, are characterized by high accuracy and high stability, suitable for long-term temperature monitoring. The busbar insulation monitoring unit detects the insulation status of the busbars. When the insulation value falls below the set value, the protection module issues an alarm to remind operators to handle the situation promptly. The busbar insulation monitoring unit can use an insulation resistance tester or an online insulation monitoring module. Insulation resistance testers are characterized by high accuracy and high reliability, suitable for periodic testing. Online insulation monitoring modules are characterized by real-time monitoring and rapid response, suitable for continuous monitoring.

[0032] The implementation principle of a high-power DC bus tie-in electronic switch system in this application is as follows: Electrical isolation between the first and second DC buses is achieved through a high-frequency isolation transformer to prevent fault propagation. A detection system monitors and compares the voltages of the two bus sections in real time. Based on the detection results, the monitoring system determines whether the technical requirements for parallel connection are met and receives control commands from the background via a communication system to execute the parallel connection operation between the DC buses. The entire system improves stability and safety through multi-layered protection mechanisms and intelligent control.

[0033] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A high-power DC bus tie-in electronic switch system, characterized in that: It includes a first DC bus, a second DC bus, a high-frequency isolation transformer, a detection system, a monitoring system, and a communication system. The high-frequency isolation transformer is connected between the first DC bus and the second DC bus to achieve fault isolation between the buses and prevent the detection circuits from affecting each other. The detection system is used to detect and compare the voltages of the first DC bus and the second DC bus. The monitoring system is used to determine whether the technical requirements for parallel connection are met based on the detection results. The communication system is used to receive background control commands and execute the parallel connection operation between the DC buses.

2. The high-power DC bus electronic switch system according to claim 1, characterized in that: It also includes a self-test module, which performs a self-test when powered on. When an external wiring error or a device malfunction occurs, the self-test module automatically protects the device and issues an alarm message. After the fault is cleared, the device automatically resumes operation.

3. A high-power DC bus tie-in electronic switch system according to claim 2, characterized in that: The self-test module is also used to continuously self-test internal key components, including AC / DC relays, power electronic devices, lightning protection devices, and fans. If an abnormality is found during self-testing at any time, the self-test module will stop the device from working and issue an alarm message. After the abnormality is eliminated, the device will automatically resume working.

4. A high-power DC bus tie-in electronic switch system according to claim 1, characterized in that: It also includes a protection module, which is used to realize DC overcurrent protection, over and undervoltage protection, over-temperature protection, bus insulation monitoring and lightning protection failure early warning.

5. A high-power DC bus tie-in electronic switch system according to claim 1, characterized in that: The turns ratio of the high-frequency isolation transformer is 1:

1.

6. A high-power DC bus tie-in electronic switch system according to claim 1, characterized in that: The detection system includes a voltage sensor and a comparison circuit. The voltage sensor is installed on the first DC bus and the second DC bus respectively to detect their respective voltage values ​​in real time. The comparison circuit is used to compare the two voltage values ​​and generate a detection signal.

7. A high-power DC bus tie-in electronic switch system according to claim 1, characterized in that: The monitoring system includes a central processing unit and a memory. The central processing unit is used to process detection signals and generate control commands, and the memory is used to store preset connection conditions and technical parameters.

8. A high-power DC bus tie-in electronic switch system according to claim 1, characterized in that: The communication system includes a wireless communication module and a wired communication module. The wireless communication module is used to communicate wirelessly with the background control system, and the wired communication module is used to communicate wiredly with the local control system.

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