Port wharf power distribution station peak power suppression device and working method thereof

Abstract

The invention discloses a port wharf power distribution station peak power suppression device and a working method thereof, and belongs to the technical field of energy storage technology and power system adjustment. Comprising a room body, and the appearance size of the room body is designed according to a 45-chi standard container and is heightened; a transformer chamber, a control chamber, a PCS chamber, a battery chamber and an outdoor water cooling unit platform are sequentially arranged in the room body. A high-voltage transformer is installed in the transformer chamber, and an isolation switch cabinet, an auxiliary and EMS monitoring cabinet and a low-voltage main inlet wire switch cabinet are arranged in the control chamber. A peak power suppression device is built in a wharf power distribution station, and aims to reduce the peak power demand cost, compensate the peak power demand in a transmission system, effectively utilize the original design capacity of a power grid, effectively utilize the regenerative power of a crane and reduce the scale of medium-voltage front-end infrastructures and feeder units. And high investment of future expansion is reduced, and electric power guarantee is provided for sustainable development of ports and piers.

Description

Technical Field

[0001] The present invention relates to the field of energy storage technology and power system regulation technology, and more specifically, to a peak power suppression device for a port terminal distribution station and a working method thereof. Background Art

[0002] During the operation of port terminals, the electricity consumption of equipment such as dock cranes has significant fluctuations. The characteristics of dock operations determine that the working status of large equipment such as cranes changes frequently, which often leads to instantaneous peaks in electricity consumption. This instantaneous peak in electricity consumption has many negative effects on the power grid:

[0003] 1. Destruction of power grid stability

[0004] 1. Voltage fluctuation:

[0005] When a large container ship docks, several quay cranes are required to operate simultaneously for loading and unloading. During the loading and unloading process, several quay cranes are in the lifting state at the same time, which will cause an instantaneous peak in power consumption of the power supply line. If the grid capacity is insufficient, the grid voltage will drop instantly. Low voltage will trigger a fault in the quay crane control system, affecting the normal operation of the equipment and even damaging some voltage-sensitive equipment;

[0006] 2. Frequency fluctuation: During peak hours of electricity consumption, the load on the power grid suddenly increases, and the power adjustment of the power generation system requires a certain response time. In this process, the balance between supply and demand of the power grid is broken, which may cause the frequency of the power grid to fluctuate. For equipment that relies on stable frequency operation, such as synchronous motors, frequency fluctuations will affect the stability of their speed, and thus affect the normal operation order of the entire terminal operation system.

[0007] 2. Effective utilization of power grid capacity is limited:

[0008] In order to cope with the instantaneous peak power consumption, the power grid often needs to reserve a large capacity when planning and designing. However, most of the time, the power load of the terminal does not reach the instantaneous peak level, which leads to the idleness and waste of the original design capacity of the power grid.

[0009] And because the instantaneous peak power consumption has already occupied part of the grid's capacity margin, when new equipment is put into use at the port terminal or the business volume increases further, the grid may not be able to meet the additional load demand. This has restricted the sustainable development of the port terminal and hindered the introduction of new equipment and further expansion of business. Summary of the invention

[0010] The purpose of the present invention is to solve the shortcomings in the prior art and to propose a peak power suppression device for a port terminal distribution station and a working method thereof.

[0011] In order to solve the above-mentioned background technical problems, the present invention adopts the following technical solutions:

[0012] A peak power suppression device for a port terminal distribution station comprises a housing, the outer dimensions of which are designed and heightened in accordance with a 45-foot standard container;

[0013] The room is provided with a transformer room, a control room, a PCS room, a battery room and an outdoor water-cooling unit platform in sequence;

[0014] A high-voltage transformer is installed in the transformer room, and an isolation switch cabinet, an auxiliary and EMS monitoring cabinet and a low-voltage main incoming line switch cabinet are arranged in the control room. The high-voltage end of the high-voltage transformer is connected to the external power grid, and the low-voltage end of the high-voltage transformer is connected to the input end of the low-voltage main incoming line switch cabinet in the control room through a copper busbar;

[0015] Four PCS (Power Conversion System) energy storage and conversion systems are installed in the PCS room. The AC side of the PCS energy storage and conversion system is connected to the output end of the low-voltage main incoming line switch cabinet in the control room, and the DC side of the PCS energy storage and conversion system is connected to the contactor side of the isolation switch cabinet in the control room.

[0016] A battery system is installed in the battery room, the battery system consists of four battery clusters, and the battery system is connected to the knife fuse switch side of the isolation switch cabinet in the control room;

[0017] The outdoor water cooling unit platform is equipped with a water cooling mechanism for cooling four battery clusters.

[0018] As a further solution of the present invention: the high-voltage transformer is a 2000KVA, 11KV / 400V high-voltage dry-type transformer.

[0019] As a further solution of the present invention: four groups of battery clusters are distributed and installed on six battery racks, and the nominal capacity of the entire battery system is 1824Ah and the nominal energy is 1127.6KWh.

[0020] As a further solution of the present invention: the power of the PCS energy storage and conversion system is 500KVA.

[0021] As a further solution of the present invention: a plurality of partition walls are arranged in the room, and the plurality of partition walls will sequentially separate the transformer room, the control room, the PCS room, the battery room and the outdoor water cooling unit platform, and each of the partition walls is provided with a door body.

[0022] As a further solution of the present invention: the transformer room, control room, PCS room and battery room are all equipped with a lighting system, an alarm system, a fire extinguishing system and a monitoring system.

[0023] As a further solution of the present invention: the PCS room and the transformer room are both provided with air inlets / outlets, the control room is provided with an air conditioner, and the battery room has an exhaust window.

[0024] As a further solution of the present invention: a heat insulation layer is provided on the inner wall of the room.

[0025] The present invention also discloses a working method of a peak power suppression device for a port terminal distribution station, which is characterized by comprising the following steps:

[0026] The power detection element continuously detects the power of the power grid. When a power gap occurs in the power grid, the data containing the power gap information is fed back to the auxiliary and EMS monitoring cabinets;

[0027] After the auxiliary and EMS monitoring cabinet receives the power gap information of the power grid fed back by the power detection element, it starts the PCS energy storage conversion system according to the preset algorithm and strategy;

[0028] After receiving the start-up command, the PCS energy storage conversion system converts the DC power of the battery system in the battery room into AC power that meets the requirements and outputs energy to the power grid, thereby compensating for the power gap of the power grid;

[0029] The auxiliary and EMS monitoring cabinets continuously monitor the capacity of the battery system consisting of four battery clusters in the battery room;

[0030] When the EMS detects that the battery capacity is lower than the set value, in order to ensure that the battery system can continue to play a role in power regulation, the EMS will control the PCS energy storage conversion system according to the current battery status and system requirements;

[0031] At this time, the PCS energy storage conversion system will obtain electrical energy from the power grid and convert AC power into DC power, and then charge the battery system to increase the battery capacity.

[0032] Compared with the prior art, the advantages of the present invention are:

[0033] The present invention constructs a peak power suppression device at the terminal distribution station, the purpose of which is to reduce the peak power demand cost, compensate for the peak power demand in the transmission system, effectively utilize the original design capacity of the power grid, effectively utilize the regenerative power of the crane, reduce the scale of the medium-voltage front-end infrastructure and feeder units, and reduce the high investment in future expansion, thereby providing power guarantee for the sustainable development of the port terminal.

[0034] At the same time, the peak suppression device can smoothly control the random, intermittent and fluctuating power generation output of the power grid, reduce volatility from the source, improve the quality of the power grid, narrow the peak-valley power difference, and provide a new optimization solution for saving terminal electricity costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a structural schematic diagram of the present invention;

[0036] Figure 2 It is a structural schematic diagram of the transformer chamber of the present invention;

[0037] Figure 3 It is a structural schematic diagram of the control room of the present invention;

[0038] Figure 4 It is a structural schematic diagram of the PCS chamber of the present invention;

[0039] Figure 5 It is a structural schematic diagram of the battery chamber of the present invention;

[0040] Figure 6 It is a system diagram of the present invention.

[0041] Description of the numbers in the figure:

[0042] 1. Room body; 101. Partition wall; 102. Insulation layer; 11. Battery room; 12. PCS room; 13. Control room; 14. Transformer room; 15. Outdoor water-cooled unit platform; 16. Battery system; 17. PCS energy storage and conversion system; 18. Auxiliary and EMS monitoring cabinet; 19. Low-voltage main incoming line switch cabinet; 20. High-voltage transformer; 21. Water cooling mechanism; 22. Isolating switch cabinet. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work are within the scope of protection of the present invention.

[0044] See also Figure 1-6 A peak power suppression device for a port terminal distribution station includes a room 1. The outer dimensions of the room 1 are designed and heightened according to a 45-foot standard container. The outer dimensions of the device are the same as those of a heightened 45-foot container for easy lifting and transportation. The heightening is to meet the layout requirements of various functional rooms inside the device.

[0045] The room 1 is provided with a transformer room 14, a control room 13, a PCS room 12, a battery room 11 and an outdoor water-cooling unit platform 15 in sequence, wherein a plurality of partition walls 101 are provided in the room 1, and the plurality of partition walls 101 will separate the transformer room 14, the control room 13, the PCS room 12, the battery room 11 and the outdoor water-cooling unit platform 15 in sequence, and each partition wall 101 is provided with a door body. The provision of the partition wall 101 helps to separate areas with different functions and prevent possible mutual interference between different equipment. In addition, a heat insulation layer 102 is provided on the inner wall of the room 1, and the provision of the heat insulation layer 102 can effectively reduce the influence of the external temperature on the equipment in the room.

[0046] A high-voltage transformer 20 is installed in the transformer room 14. The high-voltage transformer 20 is a 2000KVA, 11KV / 400V high-voltage dry-type transformer. The maintenance of the dry-type transformer is relatively simple, and there is no need to regularly check parameters such as oil level and oil temperature, thereby reducing the maintenance workload.

[0047] The control room 13 is equipped with an isolation switch cabinet 22, an auxiliary and EMS monitoring cabinet 18 and a low-voltage main incoming line switch cabinet 19. The high-voltage end of the high-voltage transformer 20 is connected to the external power grid, and the low-voltage end of the high-voltage transformer 20 is connected to the input end of the low-voltage main incoming line switch cabinet 19 of the control room 13 through a copper busbar;

[0048] Four PCS energy storage conversion systems 17 are installed in the PCS room 12. The power of the PCS energy storage conversion system 17 is 500KVA. The AC side of the PCS energy storage conversion system 17 is connected to the output end of the low-voltage main incoming line switch cabinet 19 of the control room 13, and the DC side of the PCS energy storage conversion system 17 is connected to the contactor side of the isolation switch cabinet 22 of the control room 13.

[0049] A battery system 16 is installed in the battery room 11. The battery system 16 consists of four battery clusters. The battery system 16 is connected to the knife-fuse switch side of the isolation switch cabinet 22 of the control room 13. The four battery clusters are distributed and installed on six battery racks. This layout is to make rational use of the space in the battery room while ensuring the safe distance and heat dissipation channels between the battery clusters. By dispersing the battery clusters on multiple battery racks, problems such as heat dissipation difficulties caused by excessive concentration of battery clusters can be avoided. The nominal capacity of the entire battery system 16 is 1824Ah and the nominal energy is 1127.6KWh.

[0050] The outdoor water cooling unit platform 15 is equipped with a water cooling mechanism 21 for cooling four battery clusters. Since the battery generates heat during the charging and discharging process, especially during high-power charging and discharging or long-term operation, the accumulation of heat will affect the performance and life of the battery. The water cooling mechanism 21 removes the heat generated by the battery cluster through the circulating coolant to keep the battery cluster within a suitable operating temperature range. The water cooling method has the advantages of high cooling efficiency and precise temperature control, which can effectively ensure the stable operation of the battery system and improve the reliability and service life of the battery system.

[0051] In addition, the transformer room 14, the control room 13, the PCS room 12 and the battery room 11 are all equipped with lighting systems, alarm systems, fire extinguishing systems and monitoring systems. The PCS room 12 and the transformer room 14 are both equipped with air inlets / outlets, the control room 13 is equipped with air conditioners, and the battery room 11 is equipped with exhaust windows.

[0052] The following is the working method of the peak power suppression device of the port terminal distribution station, which specifically includes the following steps:

[0053] The power detection element continuously detects the power of the power grid, and when a power gap occurs in the power grid, the data containing the power gap information is fed back to the auxiliary and EMS monitoring cabinet 18;

[0054] After receiving the power grid power gap information fed back by the power detection element, the auxiliary and EMS monitoring cabinet 18 starts the PCS energy storage conversion system 17 according to the pre-set algorithm and strategy;

[0055] After receiving the start-up command, the PCS energy storage conversion system 17 converts the DC power of the battery system 16 in the battery room 11 into AC power that meets the requirements and outputs energy to the power grid, thereby compensating for the power gap of the power grid;

[0056] The auxiliary and EMS monitoring cabinet 18 continuously monitors the capacity of the battery system 16 consisting of four battery clusters in the battery room 11;

[0057] When the EMS detects that the battery capacity is lower than the set value, in order to ensure that the battery system 16 can continue to play a role in power regulation, the EMS will control the PCS energy storage conversion system 17 according to the current battery status and system requirements;

[0058] At this time, the PCS energy storage and conversion system 17 will obtain electrical energy from the power grid and convert AC power into DC power, and then charge the battery system 16 to increase the battery capacity.

[0059] The above is only a preferred specific implementation of the present invention; however, the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and its improved conception within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A peak power suppression device for a port terminal distribution station, comprising a housing (1), characterized in that: The outer dimensions of the housing (1) are designed based on the 45-foot standard container and are heightened; The housing (1) is provided with a transformer room (14), a control room (13), a PCS room (12), a battery room (11) and an outdoor water cooling unit platform (15) in sequence; A high-voltage transformer (20) is installed in the transformer room (14), and an isolation switch cabinet (22), an auxiliary and EMS monitoring cabinet (18) and a low-voltage main incoming line switch cabinet (19) are provided in the control room (13); the high-voltage end of the high-voltage transformer (20) is connected to an external power grid, and the low-voltage end of the high-voltage transformer (20) is connected to the input end of the low-voltage main incoming line switch cabinet (19) of the control room (13) through a copper busbar; Four PCS energy storage conversion systems (17) are installed in the PCS room (12); the AC side of the PCS energy storage conversion system (17) is connected to the output end of the low-voltage main incoming line switch cabinet (19) of the control room (13); and the DC side of the PCS energy storage conversion system (17) is connected to the contactor side of the isolation switch cabinet (22) of the control room (13); A battery system (16) is installed in the battery room (11), the battery system (16) is composed of four battery clusters, and the battery system (16) is connected to the knife fuse switch side of the isolation switch cabinet (22) of the control room (13); The outdoor water cooling unit platform (15) is equipped with a water cooling mechanism (21) for cooling four battery clusters.

2. A peak power suppression device for a port terminal distribution station according to claim 1, characterized in that: The high-voltage transformer (20) is a 2000KVA, 11KV / 400V high-voltage dry-type transformer.

3. A peak power suppression device for a port terminal distribution station according to claim 1, characterized in that: The four groups of battery clusters are distributed and installed on six battery racks. The nominal capacity of the entire battery system (16) is 1824Ah and the nominal energy is 1127.6KWh.

4. A peak power suppression device for a port terminal distribution station according to claim 1, characterized in that: The power of the PCS energy storage and conversion system (17) is 500KVA.

5. The peak power suppression device for a port terminal distribution station according to claim 1, characterized in that: A plurality of partition walls (101) are arranged in the room (1), and the plurality of partition walls (101) sequentially separate the transformer room (14), the control room (13), the PCS room (12), the battery room (11) and the outdoor water cooling unit platform (15), and each of the partition walls (101) is provided with a door.

6. A peak power suppression device for a port terminal distribution station according to claim 1, characterized in that: The transformer room (14), the control room (13), the PCS room (12) and the battery room (11) are all provided with a lighting system, an alarm system, a fire extinguishing system and a monitoring system.

7. A peak power suppression device for a port terminal distribution station according to claim 1, characterized in that: The PCS room (12) and the transformer room (14) are both provided with air inlets / outlets, the control room (13) is provided with an air conditioner, and the battery room (11) is provided with an exhaust window.

8. The peak power suppression device for a port terminal distribution station according to claim 1, characterized in that: A heat insulation layer (102) is provided on the inner wall of the room body (1).

9. A working method of a peak power suppression device for a port terminal distribution station according to any one of claims 1 to 8, characterized in that: The following steps are involved: The power detection element continuously detects the power of the power grid, and when a power gap occurs in the power grid, the data containing the power gap information is fed back to the auxiliary and EMS monitoring cabinet (18); After receiving the power grid power gap information fed back by the power detection element, the auxiliary and EMS monitoring cabinet (18) starts the PCS energy storage conversion system (17) according to a preset algorithm and strategy; After receiving the start-up command, the PCS energy storage conversion system (17) converts the direct current of the battery system (16) in the battery room (11) into alternating current that meets the requirements and outputs energy to the power grid, thereby compensating for the power gap of the power grid; The auxiliary and EMS monitoring cabinet (18) continuously monitors the capacity of the battery system (16) consisting of four battery clusters in the battery room (11); When the EMS detects that the battery capacity is lower than the set value, in order to ensure that the battery system (16) can continue to play a role in power regulation, the EMS will control the PCS energy storage conversion system (17) according to the current battery status and system requirements; At this time, the PCS energy storage and conversion system (17) will obtain electric energy from the power grid and convert AC power into DC power, and then charge the battery system (16) to increase the battery capacity.

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