Rapid flexible combined AC feeder sub-module

Abstract

The invention provides a fast flexible combined AC feeder sub-module, which comprises a fast plug-in interface, a power conversion unit, a control unit and a communication module, and is characterized in that the feeder sub-module realizes fast connection and disconnection with other sub-modules through the fast plug-in interface; stable operation and efficient power transmission under different working conditions are ensured through the power conversion unit, and meanwhile, working mode control and state management are performed by using the control unit and the communication module, so that flexible reconstruction of the feeder line system is realized.

Description

Technical Field

[0001] The invention relates to the field of power electronics technology and energy conversion technology, and in particular to a fast flexible combined AC feeder submodule. Background Art

[0002] With the continuous growth of electricity demand and the increasing complexity of the grid structure, the technical transformation process faces challenges such as difficulty in feeder expansion and high maintenance costs. Especially in the rapid development of urban power, with the increasing intensity of technical transformation work and the diversification of on-site needs, the flexibility and reliability requirements of temporary equipment are constantly improving. Traditional feeder expansion methods, such as adding new feeder lines or upgrading existing equipment, are not only time-consuming and labor-intensive, but also costly, and can no longer meet the current rapid development needs. Summary of the invention

[0003] The purpose of the present invention is to propose a fast flexible combined AC feeder submodule to achieve fast connection and disconnection of the interface, thereby providing strong support for the flexible reconstruction of the feeder system.

[0004] To achieve the above object, the present invention provides a fast flexible combined AC feeder submodule, comprising:

[0005] A quick plug-in interface (10) for realizing quick connection and disconnection between feeder submodules;

[0006] A power conversion unit (20) is used to achieve stable operation and efficient power transmission of the feeder submodule under different working conditions;

[0007] The control unit and the communication module (30) are used to control the working mode and state management of the feeder submodule.

[0008] Preferably, the quick-plug interface (10) is made of a copper alloy material with high conductivity.

[0009] Preferably, the pin and socket structure of the quick-plug interface (10) adopts a standardized design, the pin diameter is 2 mm, and has precision and electrical contact stability.

[0010] Preferably, the power conversion unit (20) comprises a three-phase full-bridge rectifier (201) and an inverter circuit (202); the three-phase full-bridge rectifier (201) is composed of a full-bridge rectifier bridge and a capacitor to realize input of a three-phase AC power supply and output of a DC power supply; the inverter power supply (202) is used to realize conversion between different types of power supplies and different levels of power supplies.

[0011] Preferably, the control unit and communication module (30) comprises a control unit (301), a communication unit (302) and a self-diagnosis unit (303); the control unit (301) adopts a processor based on an ARM architecture; the communication module (302) adopts a RS-485 and Ethernet dual-redundancy design; and the self-diagnosis unit (303) is capable of monitoring the working status of each component in real time, and triggering an alarm and uploading fault information when an abnormality is found.

[0012] The present invention has the following beneficial effects:

[0013] The feeder submodule provided by the present invention can achieve fast connection and disconnection, greatly improving the flexibility of feeder system reconstruction and adapting to the challenges of high intensity of technical transformation work and diversified on-site needs; the power conversion unit ensures stable operation and efficient power transmission under different working conditions, and improves the operating efficiency of the power system; compared with the traditional feeder expansion method, the present invention does not need to add new feeder lines or upgrade existing equipment, saving a lot of time and labor costs and reducing maintenance costs; through the effective management of the control unit and the communication module, the working state of the feeder submodule is optimized, and the reliability and safety of the entire system are improved; the design of the quick plug-in interface makes the replacement and maintenance of the submodule more convenient, reduces the system downtime, and improves the continuity and stability of power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0015] Figure 1 The figure is a principle block diagram of a fast flexible combined AC feeder submodule in an embodiment of the present invention. DETAILED DESCRIPTION

[0016] The detailed description of the accompanying drawings is intended as an illustration of the current embodiments of the present invention and is not intended to represent the only form in which the present invention can be implemented. It should be understood that the same or equivalent functions can be accomplished by different embodiments that are intended to be included in the spirit and scope of the present invention.

[0017] See also Figure 1 The embodiment of the present invention provides a fast flexible combined AC feeder submodule, comprising:

[0018] A quick-plug interface 10 is used to achieve quick connection and disconnection between feeder submodules;

[0019] The power conversion unit 20 is used to achieve stable operation and efficient power transmission of the feeder submodule under different working conditions;

[0020] The control unit and the communication module 30 are used to control the working mode and status management of the feeder submodule.

[0021] The present invention realizes rapid connection and disconnection of submodules through a quick plug-in interface, ensures stable and efficient power transmission through a power conversion unit, and realizes precise control and status monitoring of submodules through a control unit and a communication module, thereby providing strong technical support for flexible reconstruction and efficient operation of the feeder system.

[0022] Furthermore, the quick-plug interface 10 uses a copper alloy material with high conductivity, which not only ensures low contact resistance, but also improves the conductivity of the interface, significantly enhances the mechanical strength, and has good heat dissipation performance, effectively avoiding interface damage caused by overheating.

[0023] The quick-plug interface 10 is made of copper alloy materials with high conductivity, such as beryllium copper or chrome copper, which have excellent conductivity and mechanical strength; the interface includes a male plug and a female socket. Both the male plug and the female socket are designed with multiple contactors, each of which is made of copper alloy and has elasticity to maintain close contact with the corresponding socket; the interface is designed with a special locking mechanism, such as a spiral lock or a snap lock, to ensure that it can be firmly locked after insertion to prevent accidental falling off; the shell of the interface is designed with a heat sink or a heat sink slot to increase the heat dissipation area and improve the heat dissipation efficiency.

[0024] When two feeder submodules need to be connected, the operator aligns the male plug with the female socket and gently pushes it in until the sound of the locking mechanism is heard, indicating that the interface is firmly connected; due to the use of high-conductivity copper alloy materials, the contact resistance of the interface is extremely low, thereby reducing energy loss and improving power transmission efficiency; in actual operation, since the passage of current generates heat, the good heat dissipation performance of the copper alloy material helps to quickly dissipate the heat, prevent the interface temperature from being too high, and avoid interface damage caused by overheating; when the connection needs to be disconnected, the operator unlocks the mechanical locking mechanism and then gently pulls out the male plug to quickly disconnect.

[0025] During the design process, the contact resistance of the docking interface is tested using a dedicated test instrument to ensure that it meets the design requirements. Normally, the contact resistance should be less than 1 milliohm. The interface is tested for its plug-in life to ensure that after a specified number of plug-ins (such as thousands of times), the interface can still maintain good mechanical and conductive properties. The temperature rise of the interface is tested by simulating the current load under actual working conditions to ensure that the temperature of the interface remains within a safe range under long-term high load.

[0026] Through the above embodiments, the quick-plug interface 10 of the present invention demonstrates its superior conductivity, mechanical strength and heat dissipation performance in practical applications, providing important guarantees for the flexibility and reliability of the feeder system.

[0027] Furthermore, the quick-disconnect interface 10 significantly improves the stability and corrosion resistance of the interface contact resistance by increasing the thickness of the interface gold-plated layer and using high-conductivity materials, thereby extending the service life of the interface and enabling the interface to withstand more than 50 plug-in and pull-out operations without damage.

[0028] Specifically, a layer of gold plating is added to the surface of the contactor made of copper alloy material. The thickness of the gold plating layer has been optimized and is thicker than the conventional design. For example, the thickness of the gold plating layer can reach more than 3 microns, while the conventional design may only be 1-2 microns. In addition to copper alloy, materials with higher conductivity, such as silver alloy, are also selected to make the core part of the contactor to further improve the conductivity.

[0029] The manufacturing process of the quick-plug interface 10 is as follows:

[0030] First, the main structure of the copper alloy contactor is manufactured using precision machining technology.

[0031] Next, the contactor surface is gold-plated, and a uniform and dense gold-plated layer is formed on the contactor surface through electroplating or other surface treatment techniques.

[0032] During the gold plating process, the thickness and quality of the gold plating layer are strictly controlled to ensure that the gold plating layer of each contactor can meet the design requirements.

[0033] Performance test of quick-plug interface 10:

[0034] Contact resistance stability test: Through multiple plugging and unplugging operations, the change of the interface contact resistance is tested to ensure that after more than 50 plugging and unplugging operations, the contact resistance remains stable and the change range does not exceed the specified range.

[0035] Corrosion resistance test: Expose the interface to a salt spray environment for a certain period of time to simulate corrosive environments such as marine climate, test the corrosion resistance of the gold-plated layer, and ensure that the interface can still work normally in harsh environments.

[0036] Life test: Conduct life tests that simulate actual usage conditions, including continuous plugging and unplugging operations and long-term load tests, to verify the reliability of the interface after more than 50 plugging and unplugging operations.

[0037] It should be noted that by increasing the thickness of the gold-plated layer, the contact resistance stability of the interface has been significantly improved, reducing power loss and heat problems caused by poor contact; the corrosion resistance of the gold-plated layer has been enhanced, so that the interface can still maintain good performance in a humid or polluted environment, extending the service life of the interface; after testing, the interface can withstand more than 50 plug-in and unplug operations without damage, meeting the needs of frequent replacement and adjustment on site, and improving the reliability and maintenance convenience of the feeder system.

[0038] Through the above embodiments, the quick-plug interface 10 of the present invention has demonstrated its superior stability, durability and reliability in practical applications, and has provided strong technical support for the flexible reconstruction of the feeder system.

[0039] Furthermore, the quick-disconnect interface 10 adopts a standardized pin and socket structure with a pin diameter of 2 mm, which ensures the precision of the interface and the stability of electrical contact. The locking structure of the pin and socket enhances the vibration and impact resistance of the interface, enabling it to meet application requirements in complex environments.

[0040] Specifically, the interface adopts a standardized pin and socket design, in which the diameter of the pin is precisely 2mm to ensure the precise fit of the interface and the stability of electrical contact; both the pin and the socket are made of high-conductivity copper alloy material and are gold-plated on the surface to improve contact performance and corrosion resistance.

[0041] The manufacturing process of pins and sockets is as follows:

[0042] The pins with a diameter of 2 mm are manufactured through precision turning and grinding processes to ensure their dimensional accuracy and surface finish.

[0043] The socket is designed with holes inside that match the pins, and precision machining is also used to ensure dimensional accuracy and good electrical conductivity inside the socket.

[0044] In the design of the pin and socket, mechanical locking structures such as spiral locks or spring clips are added to ensure that the pin can be firmly locked after being inserted into the socket to prevent the interface from loosening due to vibration or impact.

[0045] By adding elastic buffer material or structure to the contact part of the pin and the socket, the impact of vibration on the interface can be absorbed and reduced.

[0046] The socket shell is made of high-strength material, and reinforcing ribs or protective structures are added at key locations to improve the impact resistance of the interface.

[0047] Performance test of quick-plug interface 10:

[0048] Precision test: Use a special measuring tool to check the dimensional accuracy of the pin and socket to ensure that the pin diameter is 2mm and the socket hole matches it.

[0049] Electrical contact stability test: Through continuous plugging and unplugging operations, the contact resistance between the pin and the socket is tested to ensure that the contact resistance remains stable after multiple operations.

[0050] Vibration and shock resistance test: Fix the interface on a vibration table for vibration test, and perform shock test on a shock testing machine to verify the performance of the interface in a simulated complex environment.

[0051] It should be noted that due to the use of standardized pin and socket structure, the interchangeability and versatility of the interface have been improved, which is convenient for rapid on-site replacement and maintenance. The precise design ensures the stability of electrical contact, reduces contact resistance, and reduces energy loss. The enhanced locking structure and anti-vibration and anti-impact design enable the interface to work stably in complex environments such as vehicles and industrial sites, meeting stringent application requirements.

[0052] Through the above embodiments, the quick-plug interface 10 of the present invention has demonstrated its high precision, stability and environmental adaptability in practical applications, providing important guarantees for the flexibility and reliability of the feeder system.

[0053] Furthermore, the quick-plug interface 10 has been subjected to precise machining and surface treatment processes, and the plugging and unplugging smoothness of the interface has been significantly improved, and the mechanical strength has also been reliably guaranteed.

[0054] Specifically, the machining of the quick-plug interface 10:

[0055] Precision turning: Use high-precision CNC lathes to turn pins and sockets to ensure that the dimensional accuracy of their outer and inner diameters reaches ±0.01mm to meet the precise requirement of 2mm diameter;

[0056] Precision grinding: After turning, the contact surfaces of the pins and sockets are ground to obtain a higher surface finish, reduce friction and improve contact quality;

[0057] Concentricity control: The concentricity of the pin and the socket is strictly controlled during the processing to ensure that the pin can be smoothly inserted into the socket.

[0058] Surface treatment process of quick plug interface 10:

[0059] Plating treatment: The pins and sockets are gold-plated. The thickness of the gold-plated layer is uniform, ensuring good conductivity and corrosion resistance. The plating process is electroplating, and the thickness of the gold-plated layer is controlled at 3-5 microns.

[0060] Surface polishing: After plating, the pin and socket surfaces are polished to reduce surface roughness and improve plugging and unplugging smoothness;

[0061] Anti-rust treatment: The non-contact parts of the pins and sockets are treated with anti-rust treatment, such as applying anti-rust oil or using special coatings to protect the metal from environmental influences.

[0062] Plug and unplug smoothness test:

[0063] Carry out multiple plugging and unplugging tests, record the force required to insert and unplug the pin from the socket, and ensure that the force value is within the specified range, indicating that the plugging and unplugging is smooth; use a plugging and unplugging force tester to perform quantitative tests to ensure that under normal working conditions, the plugging and unplugging force is stable and will not cause damage to the interface.

[0064] Mechanical strength test:

[0065] Conduct tensile tests on the interface to simulate the tensile conditions in actual use and ensure that the interface will not break or deform under the specified tensile force. Conduct impact tests to simulate the unexpected impact that the interface may suffer and verify the reliability of its mechanical structure.

[0066] It should be noted that after precision machining and surface treatment, the quick-plug interface 10 exhibits excellent plug-in and pull-out smoothness in actual use, reduces the labor intensity of operators, and improves work efficiency; the improvement in mechanical strength enables the interface to maintain structural integrity under frequent plug-in and pull-out and possible mechanical stress, thereby extending service life and reducing maintenance costs.

[0067] Through the above-mentioned embodiments, the optimization of the quick-disconnect interface 10 of the present invention in terms of machining and surface treatment significantly improves its performance in practical applications and ensures the reliability and stability of the feeder system.

[0068] Furthermore, the power conversion unit 20 includes a three-phase full-bridge rectifier 201 and an inverter circuit 202; the three-phase full-bridge rectifier 201 is composed of a full-bridge rectifier bridge and a capacitor to realize the input of a three-phase AC power supply and a DC power supply output; the inverter power supply 202 is used to realize conversion between different types of power supplies and different levels of power supplies.

[0069] Specifically, the power conversion unit 20 is a key part of the feeder submodule, and its function is to convert the input electric energy into an electric energy form suitable for use by the feeder system, while ensuring the high efficiency and stability of the conversion process.

[0070] The three-phase full-bridge rectifier 201 is composed of six rectifier diodes forming a full-bridge structure and a matching filter capacitor. This structure can convert three-phase AC power into DC power. The working principle is as follows: after the three-phase AC power is input into the full-bridge rectifier circuit, the AC signal is converted into a pulsating DC signal through the conduction and cutoff of the diode. Subsequently, the filter capacitor smoothes the pulsating DC signal, reduces voltage fluctuations, and obtains a relatively stable DC voltage output.

[0071] The inverter circuit 202 can be composed of an insulated gate bipolar transistor (IGBT) or other types of power switching devices, which can perform switching operations according to control signals to achieve power conversion. Working principle: The inverter circuit converts the DC power output by the rectifier circuit into AC power for use by different types of loads. This conversion process can adjust the frequency and amplitude of the output voltage to adapt to different power requirements and load characteristics.

[0072] The conversion efficiency of the power conversion unit of this embodiment can reach 98%. During the energy conversion process, only a very small amount of energy is lost in the form of heat energy, etc., and most of the input energy is effectively utilized, thereby improving the overall operating efficiency of the system.

[0073] By optimizing the control strategy, the power conversion unit can maintain stable operation under different load conditions. This includes the ability to adapt to extreme situations such as overload, short circuit and voltage fluctuation; the control strategy includes various protection functions, such as overcurrent protection and overheating protection, to ensure that in abnormal situations, the power conversion unit can automatically adjust or cut off the power supply to prevent equipment damage.

[0074] The following is a specific embodiment, which describes the control strategy of the power conversion unit and how to maintain stable operation and implement various protection functions under different load conditions:

[0075] Control strategy overview:

[0076] The power conversion unit adopts a microprocessor-based digital control strategy to adjust the working state of the power conversion unit by real-time monitoring of input and output voltage, current, temperature and other parameters, as well as load demand.

[0077] Overload protection:

[0078] When the output current exceeds the preset overload threshold, the control unit will start the overload protection procedure. The specific steps include: first, try to reduce the output power to reduce the current; if the current still exceeds the threshold, the control unit will gradually reduce the output voltage until the current drops to a safe level; if the above measures are ineffective, the control unit will trigger the circuit breaker to cut off the power output to protect the power conversion unit from damage.

[0079] Short circuit protection:

[0080] When a sharp rise in output current is detected, indicating a possible short circuit, the short circuit protection mechanism will immediately start. The control unit will turn off all power switches within milliseconds, cut off the power output, and notify the operator through an alarm signal.

[0081] Voltage fluctuation adaptation:

[0082] When the input voltage fluctuates, the control unit will adjust the rectification and inversion process to maintain a stable output voltage. If the input voltage is too high, the control unit will increase the on-time of the rectifier circuit to reduce the output voltage; if the input voltage is too low, the on-time will be reduced to ensure the stability of the output voltage.

[0083] Overcurrent protection:

[0084] The control unit continuously monitors the output current and compares it with the set maximum current value. Once it detects that the current exceeds the maximum value, the control unit will immediately reduce the power output or cut off the power supply to prevent overcurrent from damaging the device.

[0085] Overheat protection:

[0086] The power conversion unit has a built-in temperature sensor to monitor the temperature of key components. When the temperature exceeds the preset safety threshold, the control unit will start the overheat protection program to cool the device by reducing power output or temporarily shutting down the power until the temperature drops to a safe range.

[0087] Through the above embodiments, the power conversion unit can maintain stable operation under different load conditions and automatically take protective measures when encountering extreme situations, thereby ensuring the reliability and safety of the system.

[0088] From the above explanation, it can be known that the design and function of the power conversion unit 20 make it a vital component of the feeder submodule, which not only ensures the efficient conversion of electric energy, but also ensures the stability and safety of the system under various working conditions.

[0089] Furthermore, the control unit and communication module 30 include a control unit 301, a communication unit 302 and a self-diagnosis unit 303. The control unit 301 adopts a processor based on an ARM architecture, and the communication module 302 adopts a dual redundant design of RS-485 and Ethernet. The self-diagnosis unit 303 can monitor the working status of each component in real time, and trigger an alarm and upload fault information when an abnormality is found.

[0090] Specifically, the control unit and the communication unit 30 are the brain and nervous system in the feeder submodule, responsible for data collection, processing, control decision-making and communication with other submodules or the main control platform.

[0091] The control unit 301 is a digital signal processor (DSP) based on the ARM architecture, which is used to achieve high-performance data acquisition, processing and logical operations. It is responsible for executing complex control algorithms, such as power coordination control and fault detection and isolation, to ensure the stable operation of the feeder submodule.

[0092] The communication unit 302 adopts RS-485 and Ethernet dual redundant design, providing two independent communication paths, enhancing the reliability and speed of communication. The transmission rate can reach 100Mbps, meeting the needs of high-speed data transmission.

[0093] The self-diagnosis unit 303 is responsible for real-time monitoring of the working status of each component and triggering an alarm when an abnormality is detected. It can upload fault information to the main control platform to facilitate operation and maintenance personnel to locate and handle problems.

[0094] In a specific embodiment, the control unit 301 uses a DSP based on the ARM Cortex-A8 core, which has 512MB of RAM and 1GB of Flash storage. The control unit 301 collects the output current and voltage of the power conversion unit and the temperature data provided by the sensor in real time through the ADC (analog-to-digital converter). The control algorithm includes a PI (proportional-integral) controller for adjusting the output of the power conversion unit to keep the output voltage stable. When the abnormal increase in current is detected, the control unit 301 will immediately execute the fault detection algorithm, determine the fault type, and start the corresponding isolation measures. The communication unit 302 has built-in RS-485 and Ethernet communication interfaces, both of which are isolated through the physical layer to ensure the redundancy of communication. In actual applications, RS-485 is used for field bus communication, and Ethernet is used for high-speed data exchange with the substation or the main control platform. Through the TCP / IP protocol, the communication unit 302 can achieve time synchronization and data sharing between submodules. The self-diagnosis unit 303 monitors key components through a series of sensors, such as the temperature sensor monitors the temperature of the power device, and the current sensor monitors the current load. When the temperature sensor detects that the temperature of the power device exceeds 85°C, the self-diagnosis unit 303 will trigger an alarm and send the fault code "TEMP_HI" to the main control platform through the communication unit 302. At the same time, the self-diagnosis unit 303 will record the timestamp and detailed information of the fault occurrence to facilitate subsequent analysis and maintenance. Through the above specific embodiments, the control unit and the communication unit 30 not only ensure the efficient operation of the feeder submodule, but also improve the reliability and maintainability of the entire feeder system through intelligent fault monitoring and diagnosis.

[0095] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A fast flexible combined AC feeder submodule, characterized in that: include: A quick plug-in interface (10) for realizing quick connection and disconnection between feeder submodules; A power conversion unit (20) is used to achieve stable operation and efficient power transmission of the feeder submodule under different working conditions; The control unit and the communication module (30) are used to control the working mode and state management of the feeder submodule.

2. The power system according to claim 1, characterized in that: The quick plug-in / disconnect interface (10) is made of a copper alloy material with high conductivity.

3. The power system according to claim 2, characterized in that: The pin and socket structure of the quick plug-in interface (10) adopts a standardized design, the pin diameter is 2 mm, and has precision and electrical contact stability.

4. The power system according to claim 1, characterized in that: The power conversion unit (20) comprises a three-phase full-bridge rectifier (201) and an inverter circuit (202); the three-phase full-bridge rectifier (201) is composed of a full-bridge rectifier bridge and a capacitor, and realizes the output of a direct current power supply after inputting a three-phase alternating current power supply; the inverter power supply (202) is used to realize the conversion between different types of power supplies and different levels of power supplies.

5. The power system according to claim 1, characterized in that: The control unit and communication module (30) comprise a control unit (301), a communication unit (302) and a self-diagnosis unit (303); the control unit (301) adopts a processor based on an ARM architecture; the communication module (302) adopts a RS-485 and Ethernet dual-redundancy design; the self-diagnosis unit (303) is capable of monitoring the working status of each component in real time, and triggering an alarm and uploading fault information when an abnormality is found.

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