An emergency power supply non-stop access system and access control method thereof

Abstract

The present invention discloses an uninterrupted access system for emergency power supply, comprising an uninterrupted power supply coordination control system arranged in a power distribution station, an emergency power supply interface cabinet and a mobile power supply vehicle installed outside the power distribution station; the uninterrupted power supply coordination control system comprises a transformer and a circuit breaker 2 connected between a mains power network and a load, a mains power detection transformer assembly is mounted on the cable between the transformer and the circuit breaker 2, the mains power network is connected to the emergency power supply interface cabinet via the transformer and the circuit breaker 2 and then via the circuit breaker 1; and a mobile power detection transformer assembly is mounted on the cable between the circuit breaker 1 and the emergency power supply interface cabinet, the power interface of the mobile power supply vehicle is connected to the emergency power supply interface cabinet via a cable, the mains power detection transformer assembly and the mobile power detection transformer assembly are both connected to the signal access end of the control system, and the control end of the control system is connected to the circuit breaker 1 and the circuit breaker 2. The present invention discloses an uninterrupted access system for emergency power supply, which can realize uninterrupted power supply access to the power supply network via a mobile power supply vehicle.

Description

Technical Field

[0001] The present invention relates to an access system and an access control method thereof, and in particular to a system and an access switching control method capable of achieving non-power-off access when an emergency power supply is accessed and seamless switching when in use. Background Art

[0002] At present, when faced with the situation that the mains power network has to be cut off for power maintenance, mobile power supply vehicles come into being. They are used for temporary power supply to ensure the continuous power supply of the mains power network.

[0003] However, when a conventional mobile power vehicle is connected, it is necessary to first disconnect the original mains power supply network and then connect the mobile power vehicle to realize power supply. This method not only affects the continuity of power consumption of end users, but also has low connection efficiency. There are also certain operational risks (high operating requirements for operators), and the mobile power vehicle needs to be driven close to the distribution room to operate. If the surrounding roads are narrow or there are vehicles or stacked objects blocking the road, the mobile power vehicle cannot be quickly connected to the power supply. Finally, after the maintenance is completed, it is necessary to cut off the power before disconnecting the mobile power vehicle and reconnecting to the mains network. Repeated power outages seriously affect the user's power consumption experience.

[0004] In addition, conventional mobile power vehicles include mobile energy storage vehicles and mobile diesel generator vehicles. When the diesel generator of the mobile diesel generator vehicle is used to generate electricity on-site for temporary power supply, the working condition of the diesel generator is limited due to the limitation of the on-board space. The diesel generator cannot operate at the highest power to generate electricity, resulting in the user's electricity power not being guaranteed. In addition, due to the constant power output of the diesel generator, there will be voltage fluctuations at the user's load end, which will cause irreversible damage to precision equipment. At the same time, the diesel generator will also cause greater air pollution and noise interference when running.

[0005] In summary, there is an urgent need for an emergency power supply non-stop access system and access control method thereof that can solve the above problems. Summary of the invention

[0006] The object of the present invention is to overcome the above-mentioned shortcomings and provide an emergency power supply non-stop access system and access control method thereof, which can achieve non-stop access to the power supply network through a mobile power supply vehicle.

[0007] The object of the present invention is achieved in that:

[0008] A non-stop power access system for emergency power supply, the system comprising an non-stop power supply coordination control system arranged in a power distribution station, an emergency power supply interface cabinet and a mobile power supply vehicle installed outside the power distribution station; the non-stop power supply coordination control system comprises a transformer and a second circuit breaker connected between a city power network and a load, and a city power detection transformer assembly is mounted on the cable between the transformer and the second circuit breaker, the city power network is connected to the emergency power supply interface cabinet via the transformer and the second circuit breaker and then via the first circuit breaker; and a mobile power supply detection transformer assembly is mounted on the cable between the first circuit breaker and the emergency power supply interface cabinet, the power interface of the mobile power supply vehicle is connected to the emergency power supply interface cabinet via a cable, the city power detection transformer assembly and the mobile power supply detection transformer assembly are both connected to the signal access end of the control system, and the control end of the control system is connected to the first circuit breaker and the second circuit breaker.

[0009] The present invention discloses an emergency power supply non-stop access system, wherein the emergency power supply interface cabinet is connected to a main switch of a circuit breaker, which is a frame circuit breaker. The frame circuit breaker is provided with two outlets, one of which is connected to a mobile power supply vehicle through a quick plug-in interface or a copper busbar connection structure.

[0010] The invention discloses an emergency power supply non-stop access system, wherein a bypass output circuit is provided with three interfaces, one of which is equipped with a molded case circuit breaker, one of which adopts a three-pole micro-breaker, and the other is a common socket.

[0011] The present invention provides an emergency power supply non-stop access system, wherein the main switch is a three-pole circuit breaker.

[0012] The present invention discloses an emergency power supply non-stop access system. A DC bus copper bar is installed in the compartment of the mobile power supply vehicle. The batteries installed in the mobile power supply vehicle are respectively connected to the DC bus copper bar after passing through a DC / DC conversion module. The DC bus copper bar is connected to a mobile energy storage control system. The AC port of the mobile energy storage control system is connected to a quick plug-in interface via a power line.

[0013] The present invention discloses an emergency power supply non-stop access system. A wireless communication module is installed in the compartment of a mobile power supply vehicle. The mobile energy storage control system is connected to a background server via the wireless communication module.

[0014] The present invention discloses an emergency power supply non-stop access system. A solar power generation component and a wind power generator set are installed on the top of the compartment of a mobile power supply vehicle. The power output ends of the solar power generation component and the wind power generator set are respectively connected to a DC bus copper bar after passing through a DC / DC conversion module.

[0015] An access control method for an emergency power supply non-stop access system, wherein the mains network supplies power to the load via a transformer and a circuit breaker, and a mobile power supply detection transformer component monitors in real time whether a mobile power supply vehicle is connected;

[0016] When the mobile power vehicle is connected, the mobile power detection transformer assembly transmits the detected voltage, frequency and amplitude signals to the control system in real time. At the same time, the mains detection transformer assembly also collects and transmits the detected voltage, frequency and amplitude signals on the mains network to the control system in real time. The control system compares whether the voltage phase, frequency and amplitude of the mains network and the mobile power vehicle are synchronized. If they are not synchronized, the control system transmits the control signal to the mobile energy storage control system to modulate the output of the mobile power vehicle, and the cycle continues until the voltage phase, frequency and amplitude signals of the mains network and the mobile power vehicle are synchronized. At this time, the control system controls circuit breaker 1 to close and keeps circuit breaker 2 closed, thereby realizing cascading with the mobile power vehicle.

[0017] At the same time, when the mobile power supply vehicle is cascaded to the emergency power supply interface cabinet, the mains detection transformer component monitors the voltage on the mains network in real time, and actually converts the three-phase voltage U A , U B and U C The control system detects the three-phase voltage U collected by the transformer component of the mains power supply. A , U B and U C Calculate and convert it to U α and U β In the α-β coordinate system formed, the conversion formula is:

[0018]

[0019] Let the discriminant be γ,

[0020]

[0021] When the value of γ is lower than the preset value, it is judged that the mains network is in a power-off state. At this time, the control system cuts off circuit breaker 2 and keeps circuit breaker 1 closed. Then the battery in the mobile power supply car starts to supply power to the load.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The present invention realizes rapid non-stop power access of the mobile power vehicle and can automatically identify and switch the power supply mode through the non-stop power supply coordination control system arranged in the power distribution station, thereby ensuring continuous and uninterrupted power supply to the load; at the same time, through the arrangement of the emergency power supply interface cabinet, it is only necessary to complete the power connection between the mobile power vehicle and the emergency power supply interface cabinet through cables with quick connectors at both ends. The entire operation is safe, fast and convenient, and when the mobile power vehicle cannot approach the power distribution station, it can also be conveniently connected to the quick plug-in interface in the emergency power supply interface cabinet through cable dragging, thereby ensuring the wide applicability of the mobile power vehicle; finally, when controlling the switching, the switching accuracy is guaranteed through the conversion of the α-β coordinate system, the possibility of misoperation is avoided, and the battery power supply cooperates with the automatic identification and switching to realize truly seamless switching, thereby avoiding adverse effects such as fluctuations in the user's power consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The present invention is a system block diagram of an emergency power supply non-stop access system.

[0025] Figure 2 Schematic diagram of the α-β coordinate system.

[0026] in:

[0027] Transformer 1;

[0028] Mains power detection transformer assembly 101, mobile power supply detection transformer assembly 102, circuit breaker one 103, circuit breaker two 104. DETAILED DESCRIPTION

[0029] See also Figure 1 and Figure 2 , the present invention relates to an uninterrupted power access system for emergency power supply, the system comprising an uninterrupted power coordination control system arranged in a power distribution station, an emergency power supply interface cabinet and a mobile power supply vehicle installed outside the power distribution station;

[0030] The non-stop power coordination control system includes a transformer 1 and a circuit breaker 2 104 connected between the mains network and the load, and a mains detection transformer assembly 101 is mounted on the cable between the transformer 1 and the circuit breaker 2 104, and the mains network is connected to the emergency power interface cabinet after passing through the transformer 1 and the circuit breaker 2 104 and then through the circuit breaker 1 103; and a mobile power detection transformer assembly 102 is mounted on the cable between the circuit breaker 1 103 and the emergency power interface cabinet, and the power interface of the mobile power vehicle is connected to the emergency power interface cabinet through the cable, and the mains detection transformer assembly 101 and the mobile power detection transformer assembly 102 are both connected to the signal access end of the control system, and the control end of the control system is connected to the circuit breaker 1 103 and the circuit breaker 2 104;

[0031] Among them: the mains detection transformer assembly 101 and the mobile power detection transformer assembly 102 are used to detect the current and voltage on the cable, wherein the voltage is used for access control switching, and the current is used for calculating electrical parameters such as power, power factor, and power quality.

[0032] Furthermore, the main switch of the emergency power interface cabinet connected to the circuit breaker 103 is a frame circuit breaker, and the frame circuit breaker is provided with two outgoing lines, one of which is connected to the mobile power vehicle through a quick plug-in interface or a copper busbar connection structure (the quick plug-in interface can realize quick plug-in; and the copper busbar connection can adapt to cable copper noses of different sizes), and the other is a bypass output circuit, which can be used to connect temporary loads;

[0033] Preferably, the bypass output circuit is provided with three interfaces, one of which is equipped with a molded case circuit breaker, one adopts a three-pole micro-breaker, and the other is an ordinary socket;

[0034] Preferably, the main switch is a three-pole circuit breaker with reverse power transmission capability, high reliable breaking capability, remote control breaking, auxiliary contacts, display switch quantity status, and current breaking in emergency. It also has phase sequence detection function and phase sequence protection function, which can alarm or directly trip for protection.

[0035] Furthermore, a DC bus copper bar is installed in the compartment of the mobile power vehicle, and the batteries installed in the mobile power vehicle are respectively connected to the DC bus copper bar after passing through a DC / DC conversion module. The DC bus copper bar is connected to a mobile energy storage control system, and the AC port of the mobile energy storage control system is connected to a quick plug-in interface via a power line.

[0036] Preferably, a wireless communication module is installed in the compartment of the mobile power supply vehicle, and the mobile energy storage control system is connected to the backend server via the wireless communication module;

[0037] Preferably, a solar power generation component and a wind turbine generator set are installed on the top of the mobile power supply vehicle, and the power output ends of the solar power generation component and the wind turbine generator set are respectively connected to the DC bus copper bar after passing through a DC / DC conversion module;

[0038] Based on the above-mentioned access control method of an emergency power supply non-stop access system, the mains network supplies power to the load through the transformer 1 and the circuit breaker 2 104, and the mobile power supply detection transformer component 102 monitors in real time whether the mobile power supply vehicle is connected;

[0039] When the mobile power vehicle is connected, the mobile power detection transformer assembly 102 transmits the detected voltage, frequency and amplitude signals to the control system in real time. At the same time, the mains detection transformer assembly 101 also collects and transmits the detected voltage, frequency and amplitude signals on the mains network to the control system in real time. The control system compares whether the voltage phase, frequency and amplitude of the mains network and the mobile power vehicle are synchronized. If they are not synchronized, the control system transmits the control signal to the mobile energy storage control system to modulate the output of the mobile power vehicle, and the cycle is repeated until the voltage phase, frequency and amplitude signals of the mains network and the mobile power vehicle are synchronized. At this time, the control system controls the circuit breaker 1 103 to close and keeps the circuit breaker 2 104 closed, thereby realizing the cascade with the mobile power vehicle.

[0040] At the same time, when the mobile power supply vehicle is cascaded to the emergency power supply interface cabinet, the mains detection transformer assembly 101 monitors the voltage on the mains network in real time, and actually converts the three-phase voltage U A , U B and U C The control system detects the three-phase voltage U collected by the transformer assembly 101. A , U B and U C Calculate and convert it to U α and U β In the α-β coordinate system formed, the conversion formula is:

[0041]

[0042] Let the discriminant be γ,

[0043]

[0044] When the value of γ is lower than the preset value, it is determined that the mains network is in a power-off state. At this time, the control system cuts off the circuit breaker 2 104 and keeps the circuit breaker 1 103 closed. Then the battery in the mobile power supply vehicle starts to supply power to the load. Since the entire automatic switching process is a millisecond-level switching, the load side always remains in a powered state.

[0045] Wherein: the preset value is a fixed quantity determined by the grid voltage and grid quality;

[0046] The reason why γ is used as the discriminant instead of single-phase or multi-phase voltage is to meet the stability requirement and avoid misjudgment caused by power grid disturbance. After the α-β coordinate conversion, the value of γ will be reflected only when the power is actually lost, thus avoiding misjudgment and improving the stability of the system. The whole discrimination process is automatically judged by the program without manual participation, thus achieving seamless switching in a real sense.

[0047] In addition: It should be noted that the above specific implementation is only an optimization scheme of this patent. Any changes or improvements made by technicians in this field based on the above concept are within the scope of protection of this patent.

Claims

1. A method for controlling access to an emergency power supply without power outage, characterized in that: The mains network supplies power to the load via the transformer (1) and the second circuit breaker (104), and the mobile power supply detection transformer assembly (102) monitors in real time whether the mobile power supply vehicle is connected; When the mobile power vehicle is connected, the mobile power detection transformer component (102) transmits the detected voltage, frequency and amplitude signals to the control system in real time. At the same time, the mains detection transformer component (101) also collects and transmits the detected voltage, frequency and amplitude signals on the mains network to the control system in real time. The control system compares whether the voltage phase, frequency and amplitude of the mains network and the mobile power vehicle are synchronized. If they are not synchronized, the control system transmits the control signal to the mobile energy storage control system to modulate the output of the mobile power vehicle. The cycle continues until the voltage phase, frequency and amplitude signals of the mains network and the mobile power vehicle are synchronized. At this time, the control system controls circuit breaker 1 (103) to close and keeps circuit breaker 2 (104) closed, thereby realizing cascading with the mobile power vehicle. At the same time, when the mobile power supply vehicle is cascaded to the emergency power supply interface cabinet, the mains power detection transformer component (101) monitors the voltage on the mains power network in real time, and actually converts the three-phase voltage U A , U B and U C The control system detects the three-phase voltage U collected by the transformer assembly (101) of the mains power supply. A , U B and U C Calculate and convert it to U α and U β In the α-β coordinate system formed, the conversion formula is: Let the discriminant be γ, When the value of γ is lower than the preset value, it is determined that the mains network is in a power-off state. At this time, the control system cuts off circuit breaker 2 (104) and keeps circuit breaker 1 (103) closed, and then the battery in the mobile power supply vehicle starts to supply power to the load.

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