Stable double-vehicle doubling device

Abstract

The utility model relates to a stable double-vehicle doubling device which comprises a main wire inlet cabinet, a first voltage transformation cabinet, an isolation cabinet, a second voltage transformation cabinet, a standby wire inlet cabinet, a main energy storage vehicle and an auxiliary energy storage vehicle which are connected in sequence, and the main energy storage vehicle and the auxiliary energy storage vehicle are each provided with a battery pack, a BMS cabinet, a PSC cabinet, an energy storage transformer and an STS cabinet. The main energy storage vehicle and the auxiliary energy storage vehicle are connected to the PSC cabinet, the PSC cabinet is provided with a detection module used for monitoring alternating current and direct current operation data, and the STS cabinet is provided with a switching module used for controlling output or input of the main energy storage vehicle / the auxiliary energy storage vehicle, and the main purpose is that the output end of the main energy storage vehicle discharges and is connected to the second transformation cabinet and the auxiliary energy storage vehicle at the same time, and the detection module of the PSC cabinet monitors the alternating current and direct current operation data. And then the auxiliary energy storage vehicle is started in a droop control mode, and the auxiliary energy storage vehicle can automatically follow the frequency and phase of the power supply through the management of the PSC cabinet, so that double-vehicle parallel power supply is realized, no impact exists, and the power guarantee scene requirement of a high-current load is met.

Description

Technical Field

[0001] The utility model relates to the technical field of intelligent power supply, and particularly relates to a stable double-vehicle parallel connection device. Background Technique

[0002] With the continuous promotion of the clean transformation of China's energy structure and the innovation of emerging energy technologies, the balance characteristics and modes of the power system are undergoing profound changes. As a new and flexible regulation means, energy storage has been widely applied to various links such as power generation, transmission, distribution, and use in the power system. The application value of energy storage has also been increasingly recognized and emphasized. A mobile energy storage power vehicle is a vehicle for emergency power supply equipped with a power supply device, which has the characteristics of fast movement, low-noise operation, simple operation, and all-weather work. It is widely used in power, communication, emergency rescue and other places where power outages will have a serious impact as a mobile emergency backup power supply.

[0003] However, the capacity of a single mobile energy storage power vehicle is limited and cannot meet the power protection requirements of some users. For example, a distribution room is equipped with multiple 800 kVA energy storage transformers, and the current on the load side of a single energy storage transformer reaches more than 400 A, while the capacity of a single energy storage vehicle cannot meet the power protection requirements of this scenario. Summary of the Invention

[0004] In order to overcome the deficiencies of the background technique, the technical solution adopted by the utility model is: a stable double-vehicle parallel connection device, which includes a main incoming line cabinet, a first transformer cabinet, an isolation cabinet, a second transformer cabinet, a standby incoming line cabinet, a main energy storage vehicle, and an auxiliary energy storage vehicle connected in sequence. The main incoming line cabinet is provided with a first switch for connecting to the external power grid, the standby incoming line cabinet is provided with a second switch for connecting to the main energy storage vehicle and the auxiliary energy storage vehicle, the isolation cabinet is provided with a third switch for controlling the on / off of the first transformer cabinet and the second transformer cabinet, and both the main energy storage vehicle and the auxiliary energy storage vehicle are provided with a battery pack, a BMS cabinet, a PSC cabinet, an energy storage transformer, and an STS cabinet. The battery pack is electrically connected to the standby incoming line cabinet through the BMS cabinet, the PSC cabinet, the energy storage transformer, and the STS cabinet in sequence. The PSC cabinet is provided with a detection module for monitoring AC and DC operation data, and the STS cabinet is provided with a switching module for controlling the output or input of the main energy storage vehicle / auxiliary energy storage vehicle.

[0005] Adopting the above technical solution, the second transformer cabinet supplies power to important equipment. When the power grid is normally supplying power, the main incoming line cabinet accesses the power grid and supplies power to the first transformer cabinet and the second transformer cabinet simultaneously. When the power grid is powered off, the first switch and the third switch are disconnected, and the second switch is closed. The output end of the main energy storage vehicle discharges and is connected to the second transformer cabinet and the auxiliary energy storage vehicle at the same time. The detection module of the PSC cabinet monitors the AC and DC operation data, and then the auxiliary energy storage vehicle is started in a droop control manner. Through the management of the PSC cabinet, the auxiliary energy storage vehicle can automatically follow the frequency and phase of the power supply, thus realizing the parallel connection and power supply of the two vehicles without impact and meeting the power protection scenario requirements of high-current loads.

[0006] The utility model is further configured that the main energy storage vehicle and the auxiliary energy storage vehicle are provided with input and output ends for charging and discharging. The input end charges the battery pack through an energy storage transformer, a PSC cabinet, and a BMS cabinet in sequence. The PSC cabinet is provided with an inverter, and the battery pack provides alternating current for the output end through the inverter. The output end of the main energy storage vehicle is connected to the standby incoming line cabinet, and the input and output ends of the auxiliary energy storage vehicle are connected in parallel to the incoming line cabinet. The switching module is a relay, and the relay controls the input and output of the auxiliary energy storage vehicle in the sampling mode / discharging mode. The circuit switching is sensitive and has high stability.

[0007] The utility model is further configured that a 1250KVA transformer and an 800KVA transformer are connected in parallel in the first transformer cabinet, and the second transformer cabinet is provided with an 800KVA transformer. When connecting to the commercial power, one group of 1250KVA transformers and two groups of 800KVA transformers work simultaneously. When the commercial power is cut off, the circuit of the first transformer cabinet is disconnected, and only the 800KVA transformer in the second transformer cabinet is powered by the main energy storage vehicle and the auxiliary energy storage vehicle, reducing the load and realizing the rationalization of energy distribution.

[0008] The utility model is further configured that the main incoming line cabinet and the standby incoming line cabinet are both provided with a metering module. The metering module includes voltage and current transformers, watt-hour meters, etc. The electrical energy of the main circuit and the standby circuit is respectively measured through the metering module, providing data support for managing the power usage situation.

[0009] The utility model is further configured that the first switch is electrically and mechanically interlocked with the third switch to realize one-key control of the first switch and the third switch, improving the convenience of circuit control.

[0010] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0011] The output end of the main energy storage vehicle discharges and is simultaneously connected to the second transformer cabinet and the auxiliary energy storage vehicle. The detection module of the PSC cabinet monitors the AC and DC operation data, and then the auxiliary energy storage vehicle is started in a droop control manner. Through the management of the PSC cabinet, the auxiliary energy storage vehicle can automatically follow the frequency and phase of the power supply, thus realizing the parallel power supply of two vehicles without impact, constructing a perfect circuit framework for power supply and backup power, and meeting the power supply guarantee scenario requirements of high-current loads.

[0012] The following further describes the embodiments of the utility model with reference to the drawings. Description of the Drawings

[0013] Figure 1 It is the circuit schematic diagram of the utility model;

[0014] Figure 2 It is the circuit schematic diagram of the main energy storage vehicle and the auxiliary energy storage vehicle of the utility model;

[0015] Wherein: 1 - main incoming line cabinet, 2 - first transformer cabinet, 3 - isolation cabinet, 4 - second transformer cabinet, 5 - standby incoming line cabinet, 6 - main energy storage vehicle, 7 - auxiliary energy storage vehicle, 8 - first switch, 9 - second switch, 10 - third switch, 11 - battery pack, 12 - BMS cabinet, 13 - PSC cabinet, 14 - energy storage transformer, 15 - STS cabinet, 16 - detection module, 17 - switching module, 18 - metering module, 19 - inverter; Detailed implementation manner

[0016] As Figure 1 , 2 shown, this embodiment provides a stable double - vehicle parallel connection device, including a main incoming line cabinet 1, a first transformer cabinet 2, an isolation cabinet 3, a second transformer cabinet 4, a standby incoming line cabinet 5, a main energy storage vehicle 6, and an auxiliary energy storage vehicle 7 connected in sequence. The main incoming line cabinet 1 is provided with a first switch 8 for connecting to the external commercial power. The standby incoming line cabinet 5 is provided with a second switch 9 for connecting to the main energy storage vehicle 6 and the auxiliary energy storage vehicle 7. The isolation cabinet 3 is provided with a third switch 10 for controlling the on - off of the first transformer cabinet 2 and the second transformer cabinet 4. Both the main energy storage vehicle 6 and the auxiliary energy storage vehicle 7 are provided with a battery pack 11, a BMS cabinet 12, a PSC cabinet 13, an energy storage transformer 14, and an STS cabinet 15. The battery pack 11 is electrically connected to the standby incoming line cabinet 5 through the BMS cabinet 12, the PSC cabinet 13, the energy storage transformer 14, and the STS cabinet 15 in sequence. The PSC cabinet 13 is provided with a detection module 16 for monitoring AC and DC operation data. The STS cabinet 15 is provided with a switching module 17 for controlling the output or input of the main energy storage vehicle 6 / auxiliary energy storage vehicle 7.

[0017] In this embodiment, the main energy storage vehicle 6 and the auxiliary energy storage vehicle 7 are provided with input and output terminals for charging and discharging. The input terminal charges the battery pack 11 through the energy storage transformer 14, the PSC cabinet 13, and the BMS cabinet 12 in sequence. The PSC cabinet 13 is provided with an inverter 19. The battery pack 11 provides alternating current for the output terminal through the inverter 19. In the first transformer cabinet 2, a 1250KVA transformer and an 800KVA transformer are connected in parallel. The second transformer cabinet 4 is provided with an 800KVA transformer. Both the main incoming line cabinet 1 and the standby incoming line cabinet 5 are provided with a metering module 18. The first switch 8 is electrically and mechanically interlocked with the third switch 10.

[0018] In the present utility model, the working principle of droop control is as follows: there is a small amplitude difference and phase difference between the output voltages of the inverters 19 of the two energy storage vehicles. Then, for the one with a leading phase, it undertakes more active power; for the one with a higher amplitude, it undertakes more reactive power. Droop control constructs the relationships between frequency - active power and amplitude - reactive power respectively. Among multiple inverters 19, the frequency of the one with a larger active power decreases (the leading phase decreases), and the amplitude of the one with a larger reactive power decreases, so as to achieve power sharing among multiple inverters 19.

[0019] The working principle of the present utility model is that when the mains power supply is normal, the mains power supplies a group of 1250KVA transformers and two groups of 800KVA transformers to work simultaneously. Among them, the 800KVA transformer of the second transformer cabinet 4 supplies power to important equipment, and the second transformer cabinet 4 is safely isolated by the isolation cabinet 3. When the mains power is cut off, the first switch 8 and the third switch 10 are disconnected, the second switch 9 is closed, and the main energy storage vehicle 6 is in the discharge mode, that is, the battery pack 11 provides alternating current through the inverter 19; the auxiliary energy storage vehicle 7 is in the charging mode, and the detection module 16 monitors the AC and DC operation data. Through the obtained data, the auxiliary energy storage vehicle 7 is converted into the discharge mode in a droop control manner, that is, the input end of the auxiliary energy storage vehicle 7 is disconnected and the output end is closed through the switching module 17, automatically following the frequency and phase of the power supply, so as to realize the parallel connection of the two vehicles to supply power to the second transformer cabinet 4.

[0020] The above are all the preferred embodiments of the present application, and the protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A stable dual-vehicle merging device, characterized in that: The invention comprises a main incoming line cabinet (1), a first transformer cabinet (2), an isolation cabinet (3), a second transformer cabinet (4), a standby incoming line cabinet (5), a main energy storage vehicle (6) and an auxiliary energy storage vehicle (7) which are connected in sequence, wherein the main incoming line cabinet (1) is provided with a first switch (8) for externally connecting to the main power supply, the standby incoming line cabinet (5) is provided with a second switch (9) for externally connecting to the main energy storage vehicle (6) and the auxiliary energy storage vehicle (7), the isolation cabinet (3) is provided with a third switch (10) for controlling the on and off of the first transformer cabinet (2) and the second transformer cabinet (4), the main energy storage vehicle (6) and the auxiliary energy storage vehicle (7) Each of the two cabinets is provided with a battery pack (11), a BMS cabinet (12), a PSC cabinet (13), an energy storage transformer (14) and an STS cabinet (15); the battery pack (11) is electrically connected to a standby incoming line cabinet (5) through the BMS cabinet (12), the PSC cabinet (13), the energy storage transformer (14) and the STS cabinet (15) in sequence; the PSC cabinet (13) is provided with a detection module (16) for monitoring AC and DC operating data; and the STS cabinet (15) is provided with a switching module (17) for controlling the output or input of a main energy storage vehicle (6) / an auxiliary energy storage vehicle (7).

2. A stable two-vehicle merging device according to claim 1, characterized in that: The main energy storage vehicle (6) and the auxiliary energy storage vehicle (7) are provided with an input end and an output end for charging and discharging, the input end sequentially charges the battery pack (11) through an energy storage transformer (14), a PSC cabinet (13), and a BMS cabinet (12), the PSC cabinet (13) is provided with an inverter (19), and the battery pack (11) provides alternating current to the output end through the inverter (19).

3. A stable two-vehicle lane merging device according to claim 1, characterized in that: A 1250KVA transformer and an 800KVA transformer are connected in parallel in the first transformer cabinet (2), and an 800KVA transformer is provided in the second transformer cabinet (4).

4. A stable two-vehicle lane merging device according to claim 1, characterized in that: The main incoming line cabinet (1) and the standby incoming line cabinet (5) are both provided with a metering module (18).

5. A stable two-vehicle lane merging device according to claim 1, characterized in that: The first switch (8) is electrically and mechanically interlocked with a third switch (10).

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