Energy storage unit multiple power supply loops applied to following grid type large energy storage power station

Abstract

The utility model discloses an energy storage unit multi-power supply loop applied to a following net type large energy storage power station. The energy storage unit multi-power supply loop comprises a boost all-in-one machine and a battery container, the boosting all-in-one machine comprises a high-voltage switch cabinet, a boosting transformer, an auxiliary transformer, a first dual-power-supply switching device, a second dual-power-supply switching device and a first UPS. The battery container comprises a first confluence cabinet and a second confluence cabinet, the first confluence cabinet internally comprises a third dual-power-supply switching device, a fifth dual-power-supply switching device and a second UPS, and the second confluence cabinet internally comprises a fourth dual-power-supply switching device, a sixth dual-power-supply switching device and a third UPS. According to the utility model, by utilizing the access of multiple power supplies, the plurality of dual-power-supply switching devices are connected to the power supplies supplied by different loops, and the power supplies are mutually standby and are nested for use, so that the continuous supply of the power supplies can be ensured.

Description

Technical Field

[0001] The utility model relates to multiple power supply circuits of an energy storage unit applied to a large-scale grid-following energy storage power station. Background Art

[0002] The power supply of existing large-scale energy storage power stations mostly uses the back-end of the booster transformer of the booster integrated machine to connect to the auxiliary transformer (AC690V to AC400V) to complete the power supply of an energy storage unit. The booster integrated machine and the battery container use UPS backup power supply to ensure power supply for important loads. This method of ensuring power supply has major defects, low fault tolerance, high risk multiples, and basically no consideration of safety redundancy. For energy storage power stations in extremely cold areas, once an emergency occurs and the power is cut off, the UPS backup power supply generally guarantees power supply for up to 1 hour, and generally only guarantees power supply for important loads of core control equipment (such equipment generally has low power), and will not guarantee power supply for high-power air-conditioning equipment, which plays an important role in ensuring battery temperature. Once an emergency occurs in an extremely cold area, the power supply guarantee capability of the energy storage line is lost, which will cause irreversible damage to the battery or other equipment inside the container, seriously affecting the service life of the energy storage battery, seriously affecting the normal operation of the energy storage equipment, and even may cause major safety accidents. Utility Model Content

[0003] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a method of utilizing the access of multiple power sources, using multiple dual power switching devices to access power supplies from different circuits, which are used as backup for each other and then nested, thereby ensuring the continuous supply of power for various power circuits of energy storage units in large-scale grid-based energy storage power stations.

[0004] The purpose of the utility model is achieved through the following technical solutions: multiple power supply circuits of energy storage units applied to large-scale energy storage power stations with grid connection, including a booster integrated machine and a battery container; the booster integrated machine includes a high-voltage switch cabinet, a booster transformer, an auxiliary transformer, a first dual power switching device, a second dual power switching device, and a first UPS; the battery container includes a first junction cabinet and a second junction cabinet, the first junction cabinet includes a third dual power switching device, a fifth dual power switching device, and a second UPS, and the second junction cabinet includes a fourth dual power switching device, a sixth dual power switching device, and a third UPS;

[0005] The high-voltage switchgear is connected to the step-up transformer through a copper busbar, and the step-up transformer is connected to the auxiliary transformer through a copper busbar;

[0006] The output terminal of the auxiliary transformer is respectively connected to the common input terminal of the first dual power switching device, the common input terminal of the third dual power switching device and the common input terminal of the fourth dual power switching device, and the standby input terminal of the first dual power switching device, the standby input terminal of the third dual power switching device and the standby input terminal of the fourth dual power switching device are respectively connected to an AC380V external power supply;

[0007] The outlet of the first dual power switching device is used to supply power to the load of the booster, and the outlet of the first dual power switching device is also connected to the common inlet of the second dual power switching device, the standby inlet of the second dual power switching device is connected to the AC220V external power supply, and the outlet of the second dual power switching device is connected to the inlet port of the first UPS;

[0008] The outlet of the third dual power switching device is used to supply power to the load in the first combiner cabinet. At the same time, the outlet of the third dual power switching device is also connected to the common inlet of the fifth dual power switching device. The standby inlet of the fifth dual power switching device is connected to the AC220V external power supply. The outlet of the fifth dual power switching device is connected to the inlet port of the second UPS.

[0009] The outgoing end of the fourth dual power switching device is used to supply power to the load in the second combiner cabinet. At the same time, the outgoing end of the fourth dual power switching device is also connected to the common incoming end of the sixth dual power switching device. The standby incoming end of the sixth dual power switching device is connected to an AC220V external power supply. The outgoing end of the sixth dual power switching device is connected to the incoming port of the third UPS.

[0010] The first UPS, the second UPS and the third UPS are all used to supply power to the load.

[0011] The first dual power switching device, the third dual power switching device, and the fourth dual power switching device are 4P dual power switching devices, and the second dual power switching device, the fifth dual power switching device, and the sixth dual power switching device are 2P dual power switching devices.

[0012] The booster integrated machine also includes a first energy storage converter and a second energy storage converter, and the battery container also includes a first battery stack and a second battery stack; the booster transformer is respectively connected to the first energy storage converter and the second energy storage converter through a copper bus, and the first energy storage converter and the second energy storage converter are respectively connected through a flame-retardant insulated sheathed cable

[0013] ZR-YJY63-1.8 / 3kV-1*240mm 2 Connect the positive and negative electrodes of the first and second battery stacks.

[0014] The booster integrated machine, the first combiner cabinet and the second combiner cabinet are respectively provided with a temperature and humidity sensor, an air conditioner and an EMS. The EMS is respectively connected to the temperature and humidity sensor and the air conditioner. The power supply of the EMS and the air conditioner is provided by a UPS.

[0015] The beneficial effect of the utility model is that the utility model utilizes the access of multiple power sources, adopts multiple dual power switching devices to access the power supplied by different circuits, and uses them as backup for each other and then nested, so as to ensure the continuous supply of power. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of various power supply circuits of the energy storage unit of the utility model applied to the grid-type large-scale energy storage power station; explanation of the figure numbers: 1-35KV related high-voltage switch cabinet, 2-AC35KV to AC690V step-up transformer, 3-auxiliary transformer, 4-first dual power switching device, 5-second dual power switching device, 6-first UPS, 7-first junction cabinet, 8-second junction cabinet, 9-third dual power switching device, 10-fourth dual power switching device, 11-fifth dual power switching device, 12-sixth dual power switching device, 13-second UPS, 14-third UPS, 15-first energy storage inverter, 16-second energy storage inverter, 17-first battery stack, 18-second battery stack, 19-AC380V external power supply, 20, 21-AC220V external power supply. DETAILED DESCRIPTION

[0017] The full name of the dual power switching device is "Automatic Transfer Switching Equipment", which is the abbreviation of Automatic transfer switching equipment. The dual power switching device is mainly used in emergency power supply systems to automatically switch the load circuit from one power source to another (backup) power source to ensure continuous and reliable operation of important loads.

[0018] The technical solution of the utility model is further explained below in conjunction with the accompanying drawings.

[0019] like Figure 1 As shown, the utility model is applied to a plurality of power supply circuits of an energy storage unit of a large-scale energy storage power station with a grid, including a booster integrated machine and a battery container; the booster integrated machine includes an integrated 35KV related high-voltage switch cabinet 1, an AC35KV to AC690V booster transformer 2, an auxiliary transformer 3, a first dual power switching device 4, a second dual power switching device 5, and a first UPS 6; the battery container includes a first junction cabinet 7 and a second junction cabinet 8, the first junction cabinet 7 includes a third dual power switching device 9, a fifth dual power switching device 11, and a second UPS 13, and the second junction cabinet 8 includes a fourth dual power switching device 10, a sixth dual power switching device 12, and a third UPS 14;

[0020] The high-voltage switchgear is connected to the step-up transformer through a copper busbar, and the step-up transformer is connected to the auxiliary transformer through a copper busbar;

[0021] The output terminal of the auxiliary transformer is respectively connected to the common input terminal of the first dual power switching device, the common input terminal of the third dual power switching device and the common input terminal of the fourth dual power switching device, and the standby input terminal of the first dual power switching device, the standby input terminal of the third dual power switching device and the standby input terminal of the fourth dual power switching device are respectively connected to the AC380V external power supply 19;

[0022] The output terminal of the first dual power switching device is used to supply power to the load of the booster, and the output terminal of the first dual power switching device is also connected to the common input terminal of the second dual power switching device, the standby input terminal of the second dual power switching device is connected to the AC220V external power supply 20, and the output terminal of the second dual power switching device is connected to the input port of the first UPS;

[0023] The outlet of the third dual power switching device is used to supply power to the load in the first combiner cabinet. At the same time, the outlet of the third dual power switching device is also connected to the common inlet of the fifth dual power switching device. The standby inlet of the fifth dual power switching device is connected to the AC220V external power supply 21. The outlet of the fifth dual power switching device is connected to the inlet port of the second UPS.

[0024] The outgoing end of the fourth dual power switching device is used to supply power to the load in the second combiner cabinet. At the same time, the outgoing end of the fourth dual power switching device is also connected to the common incoming end of the sixth dual power switching device. The standby incoming end of the sixth dual power switching device is connected to an AC220V external power supply. The outgoing end of the sixth dual power switching device is connected to the incoming port of the third UPS.

[0025] The first UPS, the second UPS and the third UPS are all used to supply power to the load.

[0026] The first dual power switching device, the third dual power switching device, and the fourth dual power switching device are 4P dual power switching devices, and the second dual power switching device, the fifth dual power switching device, and the sixth dual power switching device are 2P dual power switching devices.

[0027] The booster integrated machine also includes a first energy storage converter 15 and a second energy storage converter 16, and the battery container also includes a first battery stack 17 and a second battery stack 18 for energy storage; the booster transformer is connected to the first energy storage converter 15 and the second energy storage converter 16 through copper bars, and the first energy storage converter 15 and the second energy storage converter 16 are connected to the flame-retardant insulated sheathed cable ZR-YJY63-1.8 / 3kV-1*240mm2 Connect the positive and negative electrodes of the first battery stack 17 and the second battery stack 18. The 35kV high voltage electricity is converted into 690V AC power for the PCS (energy storage converter) through a transformer, and then the PCS converts the AC power into the DC power required for battery charging to charge the battery stack. The PCS can also convert the DC power output by the battery stack into AC690V of the PCS, and then convert the AC690V of the PCS into AC35KV AC power through a step-up transformer and transmit it to the power grid to discharge the battery stack.

[0028] Step-up transformer: converts the 35KV AC power of the high-voltage switch cabinet into AC690V for normal operation of the PCS, or converts the AC690V for normal operation of the PCS into AC35KV AC power and transmits it to the grid connection point, with the function of bidirectional conversion.

[0029] Auxiliary transformer: converts the AC690V at the rear end of the step-up transformer into AC400V for normal use of other auxiliary control devices inside the step-up integrated machine, and provides AC380V power supply for the battery container.

[0030] The first UPS, the second UPS, and the third UPS are used to supply power to the load. UPS (Uninterruptible Power System) is an uninterruptible power supply with constant voltage and frequency, which contains an energy storage device and an inverter as the main component. It is mainly used to provide uninterruptible power supply to the internal equipment of the booster and the internal equipment of the battery prefabricated cabin. When the mains input is normal, the UPS stabilizes the mains and supplies it to the load. At this time, the UPS is an AC mains voltage stabilizer, and it also charges the battery inside the machine; when the mains power is interrupted (power outage due to an accident), the UPS immediately uses the power of the battery inside the machine to continue to supply 220V AC to the load through the inverter conversion method, so that the load maintains normal operation and protects the load software and hardware from damage. UPS equipment usually provides protection against both excessive voltage and too low voltage.

[0031] The utility model adopts multiple power supply circuits for power supply, and can connect EMS data and EMS, switches, vertical encryption, photoelectric converters, thermal insulation air conditioners and other important load equipment to the power supply interface of the UPS power supply. The first dual power supply switching device is equipped inside the booster: 4P, AC380V, two power supply lines, one is the AC380V outlet of the auxiliary transformer, and the second circuit is the AC380V power supply of the other circuit of the external station transformer. The two circuit power supplies can be switched with each other at any time. Once a fault occurs in one circuit and the power is cut off, the other circuit will immediately switch seamlessly to ensure power supply. Equipped with a second dual power supply switching device: 2P, AC220V, one circuit power supply comes from the load side of the rear end of the first dual power supply switching device, and the other circuit comes from the integrated power supply system AC220V power supply. Complete the power protection function for important load equipment, including the power supply of one thermal insulation air conditioner. The thermal insulation air conditioner here is generally not used. It is started when extreme temperature conditions are detected or when the startup control strategy of EMS is received. The triple backup protection measures are: AC380V output terminal at the rear end of the auxiliary transformer, AC380V power supply of other circuits of the external station transformer, and AC220V power supply of the integrated power supply system, which serve as backup power supplies for emergency power replenishment of the previous level. The power supply of the integrated power supply system serves as the last energy station for the entire system, and can provide basic backup power supply guarantee for important loads for the entire station even if the entire station loses power, so as to eliminate the risk of irreversible damage to battery modules and cells caused by extremely low temperatures in extreme cold weather.

[0032] The third dual power switching device is equipped inside the first junction cabinet: 4P, AC380V, with two power supply lines, one for the AC380V outlet of the auxiliary transformer, and the second circuit for the AC380V power supply of the other circuit of the external station transformer. The two circuits can be switched at any time. Once a fault occurs in one circuit and the power is cut off, the other circuit will immediately switch seamlessly to ensure power supply. The fifth dual power switching device is equipped: 2P, AC220V, one circuit power comes from the load side of the rear end of the third dual power switching device, and the other circuit comes from the integrated power supply system AC220V power supply. Complete the power protection function for important load equipment (BMS, fire protection, electric operation, 1 insulation air conditioner, etc.), including the power supply of 1 insulation air conditioner. The insulation air conditioner here is generally not used. It is started when extreme temperature conditions are detected or when the start-up control strategy of EMS is received. The third circuit is the integrated power supply system AC220V. The triple backup protection measures are: AC380V output terminal at the rear end of the auxiliary transformer, AC380V power supply of other circuits of the external station transformer, and AC220V power supply of the integrated power supply system, which serve as backup power supplies for emergency power replenishment of the previous level. The power supply of the integrated power supply system serves as the last energy station for the entire system, and can provide basic backup power supply guarantee for important loads for the entire station even if the entire station loses power, so as to eliminate the risk of irreversible damage to battery modules and cells caused by extremely low temperatures in extreme cold weather.

[0033] The fourth dual power switching device is equipped in two parts of the junction cabinet: 4P, AC380V, with two power supply lines, one for the AC380V outlet of the auxiliary transformer, and the second circuit for the AC380V power supply of the other circuit of the external station transformer. The two circuits can be switched at any time. Once a fault occurs and the power is cut off, the other circuit will immediately switch seamlessly to ensure power supply. The sixth dual power switching device is equipped: 2P, AC220V, one circuit power comes from the load side of the rear end of the fourth dual power switching device, and the other circuit comes from the integrated power supply system AC220V power supply. Complete the power protection function for important load equipment (BMS, fire protection, electric operation, 1 insulation air conditioner, etc.), including the power supply of 1 insulation air conditioner. The insulation air conditioner here is generally not used. It will be started when extreme temperature conditions are detected or when the start-up control strategy of EMS is received. The third circuit is the integrated power supply system AC220V. The triple backup safeguard measures are: AC380V output terminal at the rear end of the auxiliary transformer, AC380V power supply for other circuits of the external station transformer, and AC220V power supply from the integrated power supply system.

[0034] The booster, the first junction cabinet, and the second junction cabinet are respectively provided with a temperature and humidity sensor, an air conditioner, and an EMS. The EMS is connected to the temperature and humidity sensor and the air conditioner, respectively. The power supply of the EMS and the air conditioner is provided by the UPS. The air conditioner here is a heat preservation air conditioner, which is generally not used. When the temperature and humidity sensor detects extreme temperature conditions or extreme temperatures, the air conditioner is started by the EMS. The power supply of the air conditioner is provided by the UPS, and the air conditioner can still be turned on even if the entire station loses power, so as to prevent the irreversible damage to the equipment caused by the extremely low temperature caused by extreme cold weather.

[0035] Those skilled in the art will appreciate that the embodiments described herein are intended to help readers understand the principles of the present invention, and should be understood that the protection scope of the present invention is not limited to such specific statements and embodiments. Those skilled in the art can make various other specific variations and combinations based on the technical inspirations disclosed in the present invention without departing from the essence of the present invention, and these variations and combinations are still within the protection scope of the present invention.

Claims

1. Applicable to various power supply circuits of energy storage units of large-scale energy storage power stations with grid connection, characterized in that: It includes a booster integrated machine and a battery container; the booster integrated machine includes a high-voltage switch cabinet, a booster transformer, an auxiliary transformer, a first dual power switching device, a second dual power switching device, and a first UPS; the battery container includes a first junction cabinet and a second junction cabinet, the first junction cabinet includes a third dual power switching device, a fifth dual power switching device, and a second UPS, and the second junction cabinet includes a fourth dual power switching device, a sixth dual power switching device, and a third UPS; The high-voltage switchgear is connected to the step-up transformer through a copper busbar, and the step-up transformer is connected to the auxiliary transformer through a copper busbar; The output terminal of the auxiliary transformer is respectively connected to the common input terminal of the first dual power switching device, the common input terminal of the third dual power switching device and the common input terminal of the fourth dual power switching device, and the standby input terminal of the first dual power switching device, the standby input terminal of the third dual power switching device and the standby input terminal of the fourth dual power switching device are respectively connected to an AC380V external power supply; The outlet of the first dual power switching device is used to supply power to the load of the booster, and the outlet of the first dual power switching device is also connected to the common inlet of the second dual power switching device, the standby inlet of the second dual power switching device is connected to the AC220V external power supply, and the outlet of the second dual power switching device is connected to the inlet port of the first UPS; The outlet of the third dual power switching device is used to supply power to the load in the first combiner cabinet. At the same time, the outlet of the third dual power switching device is also connected to the common inlet of the fifth dual power switching device. The standby inlet of the fifth dual power switching device is connected to the AC220V external power supply. The outlet of the fifth dual power switching device is connected to the inlet port of the second UPS. The outgoing end of the fourth dual power switching device is used to supply power to the load in the second combiner cabinet. At the same time, the outgoing end of the fourth dual power switching device is also connected to the common incoming end of the sixth dual power switching device. The standby incoming end of the sixth dual power switching device is connected to an AC220V external power supply. The outgoing end of the sixth dual power switching device is connected to the incoming port of the third UPS. The first UPS, the second UPS and the third UPS are all used to supply power to the load.

2. The multiple power supply circuits of the energy storage unit applied to the grid-connected large-scale energy storage power station according to claim 1 are characterized in that: The first dual power switching device, the third dual power switching device, and the fourth dual power switching device are 4P dual power switching devices, and the second dual power switching device, the fifth dual power switching device, and the sixth dual power switching device are 2P dual power switching devices.

3. The multiple power supply circuits of the energy storage unit applied to the grid-connected large-scale energy storage power station according to claim 1 are characterized in that: The booster integrated machine also includes a first energy storage converter and a second energy storage converter, and the battery container also includes a first battery stack and a second battery stack; the booster transformer is respectively connected to the first energy storage converter and the second energy storage converter through a copper bus, and the first energy storage converter and the second energy storage converter are respectively connected through a flame-retardant insulated sheathed cable ZR-YJY63-1.8 / 3kV-1*240mm 2 Connect the positive and negative electrodes of the first and second battery stacks.

4. The multiple power supply circuits of the energy storage unit applied to the grid-connected large-scale energy storage power station according to claim 1 are characterized in that: The booster integrated machine, the first combiner cabinet and the second combiner cabinet are respectively provided with a temperature and humidity sensor, an air conditioner and an EMS. The EMS is respectively connected to the temperature and humidity sensor and the air conditioner. The power supply of the EMS and the air conditioner is provided by a UPS.

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