A smart power supply system based on energy router

Abstract

The present invention relates to an intelligent power supply system based on an energy router, including a public transformer, a special transformer, two energy routers, two fast-cut switches, a DC / DC module, an energy storage device, a collection terminal and a controller. After the special transformer is connected to the special transformer control switch and the bypass switch, it is connected to the corresponding load through the load control switch; the public transformer is connected to the first energy router through the public transformer control switch and the first fast-cut switch, the first energy router is connected to the energy storage device through the DC / DC module, and is connected to the second energy router at the same time, the second energy router is connected between the special transformer control switch and the bypass switch through the second fast-cut switch, and is connected to the bypass switch through the load switch; the collection terminal collects the voltage, current and power information of the low-voltage side of the special transformer and connects to the controller; the controller is respectively connected to each energy router, DC / DC module, and control switch. The system is conducive to ensuring the uninterrupted power supply of important power supply loads, increasing the elasticity of the power grid, and improving the service life of important user equipment.

Description

Technical Field

[0001] The present invention belongs to the field of power supply, and specifically relates to an intelligent power supply system based on an energy router. Background Art

[0002] In recent years, with the increasing demand for uninterrupted power supply from major power users, traditional AC power distribution systems have slow fault recovery and are unable to meet the demand for highly reliable power supply. In particular, the unique geographical conditions in some areas make dual-circuit (public grid) power supply transformation extremely difficult and unable to meet the high power supply reliability requirements.

[0003] According to the current typical traditional distribution network structure, when important users need to maintain power supply, diesel generators and emergency power generation vehicles are mainly used as emergency power sources to ensure normal power supply through emergency power supply in the event of a transformer power failure. However, the use of diesel generators and emergency power generation vehicles cannot achieve "unperceived" power supply, and short-term power outages will occur, affecting the normal operation of important loads. At the same time, the transformers of important users lack dynamic adjustment capabilities, which can easily lead to short-term heavy overload or long-term inefficient operation of the substation transformers, affecting the service life of the transformers. Summary of the Invention

[0004] The purpose of the present invention is to provide an intelligent power supply system based on energy routers, which is conducive to ensuring uninterrupted power supply to important power loads, increasing the flexibility of the power grid, and improving the service life of important user equipment.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: an intelligent power supply system based on an energy router, comprising a public transformer, a special transformer, two energy routers, two fast-cut switches, a DC / DC power module, an energy storage device, a collection terminal and a system controller. The low-voltage side of the special transformer is connected to the special transformer control switch and the bypass switch in sequence, and is connected to the corresponding important loads and ordinary loads respectively through multiple load control switches; the low-voltage side of the public transformer is connected to the first fast-cut switch through the public transformer control switch, and the first fast-cut switch is connected to the AC interface of the first energy router. The DC interface of the first energy router is divided into two paths, one of which is connected to the DC interface of the first energy router. The C / DC power module is connected to the energy storage device, and the other is connected to the DC interface of the second energy router. The AC interface of the second energy router is divided into two paths, one is connected to the line between the dedicated transformer control switch and the bypass switch through the second fast-cut switch, and the other is connected to the line between the bypass switch and the load control switch through the load switch; the acquisition terminal collects the voltage, current and power information on the low-voltage side of the dedicated transformer and is connected to the system controller; the system controller is respectively connected to each energy router, DC / DC power module, public transformer control switch, dedicated transformer control switch, and load control switch to control the operation of each component unit.

[0006] Furthermore, during normal operation, the public transformer control switch, the first fast-cut switch, the second fast-cut switch, the load switch, the dedicated transformer control switch, and the load control switch corresponding to the load to be worked are turned on, the bypass switch is disconnected, the first energy router is in power control mode, i.e., P / Q mode, and the second energy router is in DC voltage control mode, i.e., Udc mode; when the dedicated transformer load rate is not higher than the set load rate threshold, all loads are supplied by the dedicated transformer, there is no power transfer between stations, and the energy storage device is in a floating charge state; when the dedicated transformer load rate is higher than the set load rate threshold, the first energy router is in P / Q mode, the second energy router is in Udc mode, and the public transformer supplies power to part of the dedicated transformer load through the first energy router and the second energy router, so that the dedicated transformer load rate is reduced to the economic range below the load rate threshold, thereby achieving the effect of dynamic capacity expansion of the dedicated transformer, and the energy storage device is in a floating charge state.

[0007] Furthermore, when a fault occurs on the dedicated transformer or high-voltage side, the acquisition terminal detects a drop in voltage on the low-voltage side of the dedicated transformer. When the voltage drops to a set threshold, the system controller controls the second quick-cut switch and the dedicated transformer control switch to disconnect, thereby cutting off the connection with the dedicated transformer and isolating the fault. At the same time, the system controller controls the first energy router to instantly switch from P / Q mode to Udc mode, and controls the second energy router to instantly switch from Udc mode to AC voltage control mode, i.e., V / F mode. The load is supplied by the public transformer. When the public transformer operates normally, the energy storage device is in a floating charge state.

[0008] Furthermore, when the second energy router fails, the second energy router automatically protects itself and locks its connection with the power-protecting load and the dedicated transformer. The system controller controls the second fast-cut switch and the load switch to disconnect, controls the bypass switch to connect, and the load is supplied by the dedicated transformer; when the second energy router returns to normal, the second energy router restores the electrical connection with the power-protecting load and the dedicated transformer, the system controller controls the second fast-cut switch and the load switch to connect, controls the bypass switch to disconnect, and restores normal operation.

[0009] Furthermore, when a fault occurs in the low-voltage busbar of the dedicated transformer or its outgoing line, the acquisition terminal detects a decrease in the voltage on the low-voltage side of the dedicated transformer. When the voltage drops to a set threshold, the system controller controls the second quick-cut switch to disconnect quickly to cut off the connection with the dedicated transformer, and at the same time controls the first energy router to switch instantly from P / Q mode to Udc mode, and controls the first energy router to switch instantly from Udc mode to V / F mode to continue supplying power to the AC load. However, the fault point is not isolated at this time, and the first energy router detects a fault within the power supply range. Its own protection is activated, and the first energy router and the second energy router are shut down and disconnected from the AC load, waiting for professionals to find and eliminate the fault before being put into operation again.

[0010] Furthermore, when both the public transformer and the dedicated transformer fail, the system controller controls the first energy router and the two fast-cut switches to disconnect, the DC / DC power module is in Udc mode, the second energy router switches from Udc mode to V / F mode, controls the load switch to turn on, and at the same time controls the load control switch corresponding to the ordinary load to turn off. The energy storage device only supplies power to important loads through the DC / DC power module.

[0011] Furthermore, the configuration capacity of the energy storage device matches the important load to ensure that when both the public transformer and the dedicated transformer fail, the important load can still operate normally for a period of time.

[0012] Furthermore, it also includes a fusion terminal. The system controller is connected to the fusion terminal to communicate with the Internet of Things management platform through the fusion terminal. The Internet of Things management platform uploads relevant data to the distribution master station and the power supply service command system. The fusion terminal receives the dispatching instructions issued by the Internet of Things management platform to control the power and power on / off of the interconnection lines in the first energy router and the second energy router, and build a multi-level control architecture between the distribution master station and the local system.

[0013] Furthermore, the system controller is connected to the first energy router, the second energy router and the DC / DC power module through the RS-485 / CAN bus to realize the collection and control of energy flow information in the system; the system controller is connected to the collection terminal and each public transformer control switch, special transformer control switch and load control switch through RS-485; the system controller is connected to the fusion terminal through Ethernet, and the fusion terminal is connected to the Internet of Things management platform through a wireless network.

[0014] Compared with the existing technology, the present invention has the following beneficial effects: it provides an intelligent power supply system based on energy routers, which does not require distribution network modification. Based on limited equipment, it enables the power supply company to "unperceive" power supply to important users during the power supply period, ensuring uninterrupted power supply to important loads, and at the same time solving the problem that users' dedicated transformers cannot dynamically adjust their capabilities, thereby increasing the flexibility of the power grid and improving the service life of important user equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram of the system architecture of an embodiment of the present invention.

[0016] Figure 2 It is a communication architecture diagram of an embodiment of the present invention.

[0017] Figure 3 Schematic diagram of normal operation of the system in accordance with the present invention.

[0018] Figure 4 Schematic diagram of a transformer or high-voltage side fault in an embodiment of the present invention.

[0019] Figure 5 This is a schematic diagram of an energy router failure in an embodiment of the present invention.

[0020] Figure 6 This is a schematic diagram of a failure of both the public transformer and the dedicated transformer in an embodiment of the present invention.

[0021] In the figure: 1. Public transformer; 2. Fusion terminal; 3. First fast-cut switch; 4. First energy router; 5. DC / DC power module; 6. Energy storage device; 7. Second energy router; 8. Second fast-cut switch; 9. Load switch; 10. Collection terminal; 11. Special transformer; 12. Special transformer control switch; 13. Bypass switch; 14. First load control switch; 15. Second load control switch; 16. Third load control switch; 17. System controller; 18. Public transformer control switch. DETAILED DESCRIPTION

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present application belongs.

[0024] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0025] like Figure 1As shown, this embodiment provides a smart power supply system based on an energy router, including a public transformer 1, a special transformer 11, two energy routers, two fast-cut switches, a DC / DC power module 5, an energy storage device 6, a collection terminal 10 and a system controller 17. The low-voltage side of the special transformer 11 is connected to the special transformer control switch 12 and the bypass switch 13 in sequence, and is connected to the corresponding important loads and ordinary loads through multiple load control switches; the low-voltage side of the public transformer 1 is connected to the first fast-cut switch 3 through the public transformer control switch 18, and the first fast-cut switch is connected to the AC interface of the first energy router 4. The DC interface of the first energy router 4 is divided into two paths, one of which is connected to the DC / DC power Module 5 is connected to the energy storage device 6, and the other is connected to the DC interface of the second energy router 7. The AC interface of the second energy router 7 is divided into two paths, one is connected to the line between the dedicated transformer control switch 12 and the bypass switch 13 through the second fast-cut switch 8, and the other is connected to the line between the bypass switch 13 and the load control switch through the load switch 9; the acquisition terminal 10 collects the voltage, current and power information on the low-voltage side of the dedicated transformer and is connected to the system controller 17; the system controller 17 is respectively connected to each energy router, DC / DC power module 5, public transformer control switch 18, dedicated transformer control switch 12, and load control switch to control the operation of each component unit.

[0026] like Figure 3 As shown, during normal operation, the public transformer control switch 18, the first fast-cut switch 3, the second fast-cut switch 8, the load switch 9, the dedicated transformer control switch 12, and the load control switches corresponding to the load to be operated are turned on, and the bypass switch 13 is turned off. The first energy router 4 on the public transformer side is in power control mode, i.e., P / Q mode, and the second energy router 7 is in DC voltage control mode, i.e., UDC mode. When the dedicated transformer load factor is not higher than a set load factor threshold (70% in this embodiment), the load is entirely supplied by the dedicated transformer, and there is no power transfer between substations. The first energy router 4 is in P / Q mode, the second energy router 7 is in UDC mode, and the energy storage device 6 is in a floating charge state. When the dedicated transformer load factor is higher than the set load factor threshold, the first energy router 4 is in P / Q mode, the second energy router 7 is in UDC mode, and the public transformer 1 supplies power to part of the dedicated transformer load through the flexible interconnection device composed of the first energy router 4 and the second energy router 7, reducing the dedicated transformer load factor to the economic range of 60% to 70%, achieving the effect of dynamic capacity expansion of the dedicated transformer. At this time, the energy storage device 6 is in a floating charge state.

[0027] like Figure 4As shown, when a fault occurs on the dedicated transformer or high-voltage side, the data acquisition terminal 10 detects a drop in voltage on the low-voltage side of the dedicated transformer. When the voltage drops to a set threshold, the system controller 17 controls the second quick-cut switch 8 and the dedicated transformer control switch 12 to disconnect, thereby severing the connection with the dedicated transformer electrical circuit and isolating the fault. At the same time, the system controller controls the first energy router 4 to instantly switch from the P / Q mode to the Udc mode, and controls the second energy router 7 to instantly switch from the Udc mode to the AC voltage control mode, i.e., the V / F mode. The load is supplied by the public transformer 1. When the public transformer is operating normally, the energy storage device 6 is in a floating charge state.

[0028] like Figure 5 As shown, when the second energy router 7 fails, the second energy router 7 automatically protects itself and locks its connection with the power-protecting load and the dedicated transformer. The system controller 17 controls the second fast-cut switch 8 and the load switch 9 to be disconnected, and controls the bypass switch 13 to be connected, and the load is supplied by the dedicated transformer. When the second energy router 7 returns to normal, the second energy router 7 restores the electrical connection with the power-protecting load and the dedicated transformer. The system controller 17 controls the second fast-cut switch 8 and the load switch 9 to be connected, and controls the bypass switch 13 to be disconnected, and normal operation is restored.

[0029] When a fault occurs in the dedicated transformer low-voltage busbar or its outgoing line, the acquisition terminal 10 detects a drop in voltage on the dedicated transformer low-voltage side. When the voltage drops to a set threshold, the system controller 17 controls the second quick-cut switch 8 to disconnect quickly to cut off the connection with the dedicated transformer electrical circuit. At the same time, the first energy router 4 is controlled to switch from P / Q mode to Udc mode instantly, and the second energy router 7 is controlled to switch from Udc mode to V / F mode instantly to continue supplying power to the AC load. However, the fault point is not isolated at this time. The second energy router 7 detects a fault within the power supply range and activates its own protection. The first energy router 4 and the second energy router 7 are shut down and disconnected from the AC load electrical connection, waiting for professionals to find and eliminate the fault before being put into operation again.

[0030] like Figure 6 As shown, when both the public transformer and the dedicated transformer fail, system controller 17 controls the two energy routers and two quick-cut switches to disconnect, switches load switch 9 to close, and disconnects the load control switches corresponding to common loads. Energy storage device 6 then supplies power only to critical loads via DC / DC power module 5. At this point, DC / DC power module 5 is in UDC mode, and second energy router 7 switches from UDC mode to V / F mode. The energy storage device 6 is configured with a capacity that matches the critical load, ensuring that even if both the public transformer and the dedicated transformer fail, the critical load can continue to operate normally for a period of time.

[0031] like Figure 2As shown, the system also includes a fusion terminal 2, and the system controller 17 is connected to the fusion terminal 2 to communicate with the Internet of Things management platform through the fusion terminal 2. The Internet of Things management platform uploads relevant data to the distribution master station and the power supply service command system. The fusion terminal 2 receives the dispatching instructions issued by the Internet of Things management platform to control the power and switching of the interconnection lines in the first energy router 4 and the second energy router 7, and constructs a multi-level control architecture of the distribution master station and the local system to achieve multi-objective hierarchical optimization control: (1) The distribution master station performs global optimization and instruction issuance, and the edge equipment dynamically decomposes and executes instructions based on real-time monitoring data, and realizes component-level emergency protection and fault isolation at the same time; (2) Through cloud-edge collaborative control, optimization control such as heavy-load transfer, no-load optimization, fault recovery and power failure support of the interconnected substation is realized, and the power supply level of the substation is improved in multiple dimensions.

[0032] In this embodiment, the system controller 17 is connected to the first energy router 4, the second energy router 7 and the DC / DC power module 5 through the RS-485 / CAN bus to realize the collection and control of energy flow information in the system; the system controller 17 is connected to the collection terminal 10 and each public transformer control switch 18, special transformer control switch 12, load control switches 14, 15, and 16 through RS-485; the system controller 17 is connected to the fusion terminal 2 through Ethernet, and the fusion terminal 2 is connected to the Internet of Things management platform through a wireless network.

[0033] The intelligent power supply system of the present invention can achieve power supply for important loads. When an important user's dedicated transformer fails and cannot supply power, the system can achieve millisecond-level switching, and the load can be transferred in "zero seconds", and uninterrupted power supply is provided to important power-saving loads through another power supply. The system controller communicates with the fusion terminal on the substation side, uploads important information to the distribution automation master station and the existing power supply service command system, and deploys the strategy of the optimal control layer in the form of a micro-application APP on the fusion terminal to perform panoramic real-time monitoring and control of the flexible interconnection system. The energy storage device set on the DC side can be easily moved as a third emergency power supply. The energy storage device can be transferred to other scenarios according to the power supply needs, and the interface can be plug-and-play. In this embodiment, the DC side reserves an interface to adapt to the background and needs of photovoltaic access, and increases the power supply through distributed photovoltaics to further improve the power supply reliability.

[0034] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other manner. Any person skilled in the art may utilize the above-disclosed technical content to modify or modify the present invention into equivalent embodiments. However, any simple modifications, equivalent variations, and modifications to the above embodiments that do not depart from the technical content of the present invention and are based on the technical essence of the present invention remain within the scope of protection of the present invention.

Claims

1. An intelligent power supply system based on energy router, characterized in that: It includes a public transformer, a special transformer, two energy routers, two fast-cut switches, a DC / DC power module, an energy storage device, a collection terminal and a system controller. The low-voltage side of the special transformer is connected to the special transformer control switch and the bypass switch in sequence, and then connected to the corresponding important loads and ordinary loads through multiple load control switches; the low-voltage side of the public transformer is connected to the first fast-cut switch through the public transformer control switch, and the first fast-cut switch is connected to the AC interface of the first energy router. The DC interface of the first energy router is divided into two paths, one of which is connected to the energy storage device through the DC / DC power module, and the other is connected to the DC interface of the second energy router. The AC interface of the second energy router is divided into two paths, one of which is connected to the line between the special transformer control switch and the bypass switch through the second fast-cut switch, and the other is connected to the line between the bypass switch and the load control switch through the load switch; the collection terminal collects the voltage, current and power information of the low-voltage side of the special transformer and connects it to the system controller; the system controller is respectively connected to each energy router, DC / DC power module, public transformer control switch, special transformer control switch, and load control switch to control the operation of each component unit; During normal operation, the public transformer control switch, the first fast-cut switch, the second fast-cut switch, the load switch, the special transformer control switch, and the load control switch corresponding to the load to be worked are turned on, the bypass switch is turned off, the first energy router is in power control mode, i.e., P / Q mode, and the second energy router is in DC voltage control mode, i.e., Udc mode; when the special transformer load rate is not higher than the set load rate threshold, all loads are supplied by the special transformer, there is no power transfer between stations, and the energy storage device is in floating charge state; when the special transformer load rate is higher than the set load rate threshold, the first energy router is in P / Q mode, the second energy router is in Udc mode, and the public transformer supplies power to part of the special transformer load through the first energy router and the second energy router, so that the special transformer load rate drops to the economic range below the load rate threshold, achieving the effect of dynamic capacity increase of the special transformer, and the energy storage device is in floating charge state at this time; When a fault occurs on the dedicated transformer or high-voltage side, the acquisition terminal detects that the voltage on the low-voltage side of the dedicated transformer is reduced. When the voltage drops to the set threshold, the system controller controls the second fast-cut switch and the dedicated transformer control switch to disconnect, so as to cut off the connection with the dedicated transformer and isolate the fault. At the same time, the first energy router is controlled to switch from the P / Q mode to the Udc mode instantly, and the second energy router is controlled to switch from the Udc mode to the AC voltage control mode, i.e., the V / F mode, instantly. The load is powered by the public transformer. When the public transformer is operating normally, the energy storage device is in a floating charge state. When the second energy router fails, the second energy router automatically protects itself and locks the connection with the power-protecting load and the dedicated transformer. The system controller controls the second fast-cut switch and the load switch to be disconnected, and controls the bypass switch to be connected, and the load is supplied with power by the dedicated transformer. When the second energy router returns to normal, the second energy router restores the electrical connection with the power-protecting load and the dedicated transformer. The system controller controls the second fast-cut switch and the load switch to be connected, and controls the bypass switch to be disconnected, and the normal operation mode is restored. When the low-voltage busbar of the dedicated transformer or its outgoing line fails, the acquisition terminal detects that the voltage on the low-voltage side of the dedicated transformer is reduced. When the voltage drops to the set threshold, the system controller controls the second fast-cut switch to disconnect quickly to cut off the connection with the dedicated transformer, and at the same time controls the first energy router to switch from P / Q mode to Udc mode instantly, and controls the first energy router to switch from Udc mode to V / F mode instantly to continue to supply power to the AC load; but at this time, the fault point is not isolated, and the second energy router detects that there is a fault in the power supply range, and its own protection is activated. The first energy router and the second energy router are shut down and disconnected from the electrical connection with the AC load, waiting for professionals to find and eliminate the fault before re-starting; When both the public transformer and the special transformer fail, the system controller controls the first energy router and the two fast-cut switches to disconnect, the DC / DC power module is in Udc mode, the second energy router switches from Udc mode to V / F mode, controls the load switch to turn on, and controls the load control switch corresponding to the ordinary load to disconnect. The energy storage device only supplies power to important loads through the DC / DC power module.

2. According to claim 1, the intelligent power supply system based on energy router is characterized in that: The configuration capacity of the energy storage device is matched with the important load to ensure that when both the public transformer and the special transformer fail, the important load can still operate normally for a period of time.

3. According to claim 1, the intelligent power supply system based on energy router is characterized in that: It also includes a fusion terminal, and the system controller is connected to the fusion terminal to communicate with the Internet of Things management platform through the fusion terminal. The Internet of Things management platform uploads relevant data to the distribution master station and the power supply service command system. The fusion terminal receives the dispatching instructions issued by the Internet of Things management platform to control the power of the interconnection lines and the switching on and off in the first energy router and the second energy router, and build a multi-level control architecture between the distribution master station and the local system.

4. According to claim 3, the intelligent power supply system based on energy router is characterized in that: The system controller is connected to the first energy router, the second energy router and the DC / DC power module through the RS-485 / CAN bus to realize the collection and control of energy flow information in the system; the system controller is connected to the collection terminal and each public transformer control switch, special transformer control switch, and load control switch through RS-485; the system controller is connected to the fusion terminal through Ethernet, and the fusion terminal is connected to the Internet of Things management platform through the wireless network.

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