Novel energy-efficiency energy storage, current transformation and voltage boosting integrated box-type substation

Abstract

The invention relates to a novel energy-efficiency energy storage, current transformation and voltage boosting integrated box-type substation which integrates a three-split dry-type transformer, a high-voltage protection metering cabinet, a low-voltage power communication cabinet and an outdoor energy storage converter. The three-split dry-type transformer adopts a three-split structure combining axial splitting and radial splitting; only the energy storage system and the power grid need to be connected on site, a cable trench of an independent energy storage converter and civil construction are omitted, and on-site construction is convenient and fast. The site construction difficulty and cost are reduced, and the system efficiency of the photovoltaic energy storage power station is improved; the output efficiency of the dry-type transformer is improved, power station equipment is reduced, and the photovoltaic energy storage efficiency is improved; the product layout of the all-in-one machine is more concentrated and optimized, the occupied area is smaller, the cost is lower, and the product operation is more efficient, safer and more reliable.

Description

Technical Field

[0001] The present invention relates to a substation, and more specifically, to a new energy-efficient integrated box-type substation for energy storage, current conversion, and voltage boosting. Background Art

[0002] After several years of rapid development in the energy storage industry, by 2023, the newly installed capacity of new energy storage in China has increased by nearly 50 GWh. The necessity of developing energy storage has been widely recognized by society. With the combined efforts of various favorable policies such as investment subsidies introduced by governments at all levels, the energy storage industry has developed at a high speed.

[0003] Existing box-type substations and energy storage integrated machines have problems such as long equipment construction periods, high costs, single capacity selection, and difficulty in managing numerous devices. In particular, a large amount of copper bars or cables are required for the connection between the energy storage converter and the step-up transformer, further increasing the volume of the entire box-type substation and the integrated machine, and increasing the equipment investment cost. In addition, the problem of single capacity selection of the converter, which cannot match the requirements of higher and more transformer capacities, is becoming increasingly severe, resulting in a reduction in the utilization efficiency of the entire photovoltaic and energy storage system. Summary of the Invention

[0004] In view of the above deficiencies in the prior art, the present invention provides a new energy-efficient integrated box-type substation for energy storage, current conversion, and voltage boosting, which has more converter capacity matching options, improves the output efficiency of the step-up transformer, reduces substation equipment, improves the photovoltaic energy storage efficiency, has a smaller footprint, and lower costs.

[0005] The technical solution adopted by the present invention is as follows:

[0006] A new energy-efficient integrated box-type substation for energy storage, current conversion, and voltage boosting,

[0007] comprising an integrated machine base, a three-phase split dry-type transformer, a high-voltage protection and metering cabinet, a low-voltage power and communication cabinet, and an outdoor energy storage converter;

[0008] The three-phase split dry-type transformer, the high-voltage protection and metering cabinet, the low-voltage power and communication cabinet, the outdoor energy storage converter, and the box body shell are all arranged on the integrated machine base,

[0009] The three-phase split dry-type transformer adopts a three-phase split structure combining axial splitting and radial splitting. Among them, the first low-voltage winding and the second low-voltage winding are arranged in an axial splitting manner, and the third low-voltage winding is arranged radially with the first low-voltage winding and the second low-voltage winding to form a radial splitting structure; the third low-voltage winding is arranged outside the first low-voltage winding and the second low-voltage winding; the high-voltage winding is arranged outside the third low-voltage winding.

[0010] Preferably, the high-voltage protection metering cabinet is provided with a high-voltage circuit breaker, a high-voltage isolating switch, a high-voltage grounding switch, a high-voltage lightning arrester for protecting the three-split dry-type transformer, as well as a high-voltage current transformer, a high-voltage voltage transformer and a multi-function watt-hour meter for high-voltage side metering of the three-split dry-type transformer.

[0011] Preferably, the three-split dry-type transformer and the outdoor energy storage converter are connected by a busbar hard copper busbar, and the busbar hard copper busbar is protected by a copper busbar channel shield.

[0012] Preferably, the low-voltage power communication cabinet integrates measurement and control, communication, power and other functions, and is provided with components such as a box-type transformer comprehensive measurement and control device, a temperature and humidity controller, a dry-type transformer thermostat, a UPS power supply, and a dual power supply switch;

[0013] The device is provided with a dual power conversion switch for realizing automatic switching between a main power supply and a backup power supply.

[0014] Preferably, the box top cover of the box shell is equipped with four air outlet centrifugal fans above the three-split dry-type transformer, an air inlet louver is installed on one side of the dry transformer room wall, and four air outlet axial flow fans are installed on the other side;

[0015] An air inlet is opened at the bottom plate of the integrated machine base below the three-split dry-type transformer, cold air is taken in through the shutters and the air inlet of the bottom plate of the integrated machine base, the top cover centrifugal fan draws hot air, and the wall axial flow fan draws hot air; the bottom of the three-split dry-type transformer is equipped with a cross-flow fan for blowing air.

[0016] Preferably, a high-voltage cable inlet hole is provided on the base of the integrated machine, a detachable cable bottom plate and a cable clamp are installed on the inlet hole, and the high-voltage cable passes through the high-voltage cable inlet hole in sequence.

[0017] Preferably, the secondary cable inlet hole is opened on the integrated machine base, and a detachable tower-shaped sealing ring is installed on the inlet hole, and secondary and other communication cables pass through the secondary cable inlet hole in sequence.

[0018] Preferably, the converter DC cable inlet hole is provided on the integrated machine base, a detachable cable bottom plate and a cable clamp are installed on the inlet hole, and the converter DC cable passes through the converter DC cable inlet hole in sequence.

[0019] The beneficial effects of the present invention compared with the prior art are as follows:

[0020] The present invention relates to a new energy photovoltaic power generation and energy storage power station, which improves the output efficiency of dry-type transformers, reduces power station equipment, and improves photovoltaic energy storage efficiency. The all-in-one equipment product layout is more centralized and optimized, with a smaller footprint and lower costs, and the product operation is more efficient, safe and reliable.

[0021] The new energy-efficient energy storage integrated converter and step-up box-type substation of the present invention uses the heat dissipation of the transformer body to reduce the temperature rise of the entire dry transformer chamber; in addition, an axial flow fan is also installed on the box wall of the low-voltage chamber of the box body to extract the heat generated in the low-voltage chamber to reduce the temperature rise of the low-voltage chamber. A complete set of fan heat dissipation systems is used to ensure the overall indoor temperature rise environment of the integrated machine and ensure the efficient and long-term operation of the product.

[0022] The new energy-efficient energy storage integrated converter and step-up box-type substation of the present invention integrates a three-split dry-type transformer, a high-voltage protection and metering cabinet, a low-voltage power and communication cabinet, and an outdoor energy storage converter, with a more reasonable structure and a lower price. On-site, only the energy storage system and the power grid need to be connected, eliminating the cable trench and civil engineering construction for a separate energy storage converter, and the on-site construction is convenient and fast. It reduces the on-site construction difficulty and cost and improves the system efficiency of the photovoltaic energy storage power station. Brief Description of the Drawings

[0023] Figure 1 It is the front view of the external structure layout scheme of the present invention;

[0024] Figure 2 It is the top view of the external structure layout scheme of the present invention;

[0025] Figure 3 It is the schematic diagram of the structure of the three-split dry-type transformer of the present invention;

[0026] Figure 4 It is the simplified diagram of the component layout of the high-voltage cabinet of the present invention;

[0027] Figure 5 It is the drawing of the base inlet cable opening of the present invention.

[0028] Description of the symbols of the main components in the drawings:

[0029] In the figure:

[0030] 81. First low-voltage coil

[0031] 82. Second low-voltage coil

[0032] 83. Third low-voltage coil

[0033] 84. High-voltage coil

[0034] 85. Iron core

[0035] 86. Copper busbar for the outgoing line of the first low-voltage coil

[0036] 87. Copper busbar for the outgoing line of the second low-voltage coil

[0037] 88. Copper busbar for the outgoing line of the third low-voltage coil

[0038] 89. Copper busbar for the outgoing line of the high-voltage coil. Detailed Embodiment

[0039] The present invention will be described in detail below with reference to the accompanying drawings and embodiments:

[0040] A new energy-efficient integrated energy storage, current conversion and step-up box-type substation

[0041] comprises an integrated machine base 1, a three-split dry-type transformer 2, a high-voltage protection and metering cabinet 3, a low-voltage power and communication cabinet 4, and outdoor energy storage converters 51 / 52 / 53;

[0042] The three-split dry-type transformer 2, the high-voltage protection and metering cabinet 3, the low-voltage power and communication cabinet 4, the outdoor energy storage converters 51 / 52 / 53 and the box body shell 6 are all arranged on the integrated machine base 1, and are characterized in that:

[0043] The three-split dry-type transformer 2 adopts a three-split structure combining axial splitting and radial splitting. Among them, the first low-voltage winding and the second low-voltage winding are arranged in an axial splitting manner, and the third low-voltage winding is radially arranged with the first low-voltage winding and the second low-voltage winding to form a radial splitting structure; the third low-voltage winding is arranged outside the first low-voltage winding and the second low-voltage winding; the high-voltage winding is arranged outside the third low-voltage winding.

[0044] Preferably, the high-voltage protection and metering cabinet 3 is provided with a high-voltage circuit breaker, a high-voltage disconnector, a high-voltage earthing switch, a high-voltage arrester for protecting the three-split dry-type transformer 2, and a high-voltage current transformer, a high-voltage voltage transformer and a multi-functional watt-hour meter for high-voltage side metering of the three-split dry-type transformer 2.

[0045] Preferably, the three-split dry-type transformer 2 and the outdoor energy storage converters 51 / 52 / 53 are connected by a rigid copper busbar, and the rigid copper busbar is protected by a copper busbar channel shield 7.

[0046] Preferably, the low-voltage power and communication cabinet 4 integrates functions such as measurement and control, communication, and power, and is provided with components such as a box-type substation integrated measurement and control device, a temperature and humidity controller, a dry-type transformer temperature controller, a UPS power supply, and a dual-power switching switch;

[0047] The device is provided with a dual-power conversion switch for automatically switching between the main power supply and the standby power supply.

[0048] Preferably, the box body top cover of the box body shell 6 is provided with four outwind centrifugal fans above the three-split dry-type transformer 2, an air inlet louver is installed on one side of the dry transformer room wall, and four outwind axial fans are installed on the other side;

[0049] An air intake hole is opened at the bottom plate of the integrated machine base 1 below the three - split dry - type transformer 2. Cold air enters through the louver and the air intake hole at the bottom plate of the integrated machine base, and hot air is extracted by the centrifugal fan on the top cover and the axial - flow fan on the wall. A cross - flow fan is provided at the bottom of the three - split dry - type transformer 2 for blowing air.

[0050] Preferably, a high - voltage cable inlet hole 311 is opened on the integrated machine base 1, and a detachable cable bottom plate and a cable clamp are installed on the inlet hole. The high - voltage cable passes through the high - voltage cable inlet hole 311 in sequence.

[0051] Preferably, secondary cable inlet holes 411 and 412 are opened on the integrated machine base 1, and a detachable tower - shaped sealing ring is installed on the inlet hole. Secondary communication cables such as secondary cables pass through the secondary cable inlet holes 411 and 412 in sequence.

[0052] Preferably, converter DC cable inlet holes 511, 512, and 513 are opened on the integrated machine base 1, and a detachable cable bottom plate and a cable clamp are installed on the inlet hole. The converter DC cable passes through the converter DC cable inlet holes 511, 512, and 513 in sequence.

[0053] As Figure 1 、 Figure 2 shown, the new - energy new - efficiency energy - storage current - conversion and step - up integrated box - type substation includes an integrated machine base 1, a three - split dry - type transformer 2, a high - voltage protection and metering cabinet 3, a low - voltage power and communication cabinet 4, outdoor energy - storage converters 51 / 52 / 53, and a box body shell 6. The three - split dry - type transformer 2, the high - voltage protection and metering cabinet 3, the low - voltage power and communication cabinet 4, the outdoor energy - storage converters 51 / 52 / 53, and the box body shell 6 are all located on the integrated machine base 1. The three - split dry - type transformer 2, the high - voltage protection and metering cabinet 3, and the low - voltage power and communication cabinet 4 are all inside the box body shell 6. The high - and low - voltage outgoing lines on both sides of the three - split dry - type transformer 2 are respectively connected to the high - voltage protection and metering cabinet 3 and the outdoor energy - storage converters 51 / 52 / 53.

[0054] As Figure 3 shown, the three - split dry - type transformer 2 in the new - energy new - efficiency energy - storage current - conversion and step - up integrated box - type substation adopts a three - split structure combining axial splitting and radial splitting. This structural form not only avoids the disadvantages of increased height and low efficiency caused by axial splitting of multiple low - voltage windings, but also avoids the problems of a large reduction in excitation efficiency, an increase in capacitive current between low - voltage windings, and difficulty in ensuring impedance balance caused by radial splitting of multiple low - voltage windings, greatly improving the transformer output efficiency. In addition, the three - split structure of the dry - type transformer also increases the number of energy - storage converters it drives, improves the capacity of the phalanx, but does not increase the number of on - site step - up transformers, but increases their capacity, thus reducing the number of equipment in the entire substation.

[0055] As Figure 4, Figure 5 As shown in the figure, in the high-voltage protection and metering cabinet 3 of the new energy efficient energy storage, conversion, and step-up integrated box-type substation, there are installed a high-voltage circuit breaker - high-voltage disconnector 321, a high-voltage earthing switch 322, a high-voltage lightning arrester 323, etc., which are used to protect the three-phase split dry-type transformer 2. There are also installed a high-voltage current transformer 325, a high-voltage voltage transformer (324), a multi-functional watt-hour meter, etc., which are used for the high-voltage side metering of the three-phase split dry-type transformer 2.

[0056] As Figure 1 , Figure 2 As shown in the figure, the three-phase split dry-type transformer 2 of the new energy efficient energy storage, conversion, and step-up integrated box-type substation is connected to the outdoor energy storage converters 51 / 52 / 53 by hard copper busbars. The copper busbars not only have strong overload capacity and higher reliability, but also have excellent heat dissipation performance, which can effectively avoid overheating faults. Compared with connecting with power cables, it reduces the loss of using cables and avoids problems such as cable aging. In addition, the hard copper busbars are protected by a special copper busbar channel shield 7, which not only improves the protection level, but also can effectively assist the copper busbars in heat dissipation and enhance the reliability of the whole product.

[0057] The low-voltage power and communication cabinet 4 integrates functions such as measurement and control, communication, and power, and is equipped with components such as a box-type substation integrated measurement and control device, a temperature and humidity controller, a dry-type transformer temperature controller, a UPS power supply, a dual-power switch, etc. It not only ensures the efficient operation of the whole product well, but also provides more convenience for the maintenance and repair of the product in the substation.

[0058] As Figure 1 As shown in the figure, the protection level of the box body shell 6 is IP54, which is suitable for harsh environmental areas with high humidity, high sand and dust, etc. It not only wraps the three-phase split dry-type transformer 2, the high-voltage protection and metering cabinet 3, and the low-voltage power and communication cabinet 4, providing the necessary protection conditions for the normal operation of each component, but also is equipped with an auxiliary small dry-type transformer 8, a carbon dioxide fire extinguisher 9, a smoke alarm 10, an emergency light, etc., providing functions such as emergency fire protection for the product to ensure operation.

[0059] As Figure 1As shown, the top cover of the box shell 6 is equipped with four centrifugal fans for air outlet above the three-split dry-type transformer 2, and air inlet shutters are installed on one side of the wall of the dry-type transformer room, and four axial fans for air outlet are installed on the other side. An air inlet hole is opened at the bottom plate of the integrated machine base 1 below the three-split dry-type transformer 2, and cold air is introduced through the shutters and the air inlet holes on the bottom plate of the integrated machine base. The centrifugal fan on the top cover draws hot air, and the axial fan on the wall draws hot air. The cross-flow fan at the bottom of the three-split dry-type transformer 2 blows the transformer body to dissipate heat, thereby reducing the temperature rise of the entire dry-type transformer room. In addition, an axial fan is also installed on the wall of the low-voltage chamber of the box shell to draw out the heat generated by the low-voltage chamber to reduce the temperature rise of the low-voltage chamber. A complete set of fan heat dissipation system is used to ensure the overall indoor temperature rise environment of the integrated machine and ensure the efficient and long-term operation of the product.

[0060] like Figure 5 As shown, the high-voltage cable entry hole 311 is provided on the integrated machine base 1 of the new energy-efficient energy storage conversion and boosting integrated box-type substation for new energy, and a detachable cable bottom plate and a cable clamp are installed on the entry hole, and the high-voltage cable passes through the high-voltage cable entry hole 311 in sequence. In addition, the secondary cable entry holes 411 and 412 are provided on the integrated machine base 1, and a detachable tower-shaped sealing ring is installed on the entry hole, and secondary and other communication cables can pass through the secondary cable entry holes 411 and 412 in sequence. In addition, the converter DC cable entry holes 511, 521, and 531 are provided on the integrated machine base 1, and a detachable cable bottom plate and a cable clamp are installed on the entry hole, and the converter DC cable passes through the converter DC cable entry holes 511, 521, and 531 in sequence.

[0061] Attached Figure 3 , is a simplified diagram of a three-split dry transformer coil. The three-split structure of the three-split dry transformer 2 adds an independent low-voltage winding output line compared to the ordinary double-split structure. Each winding has a higher impedance with the high-voltage winding. This design makes the three low-voltage windings relatively independent electrically, which can better isolate faults and avoid single-point faults affecting the entire system. Each low-voltage winding carries a separate energy storage converter, thereby increasing the number of energy storage converters carried and providing higher system flexibility and redundancy. The three low-voltage output windings can distribute the load more evenly, reduce the burden of a single energy storage converter, and improve system stability and life.

[0062] The above is only a preferred embodiment of the present invention, and does not limit the structure of the present invention in any form. Any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention are within the scope of the technical solution of the present invention.

Claims

1. A new energy-efficient integrated box-type substation for energy storage, current conversion and step-up which includes an integrated machine base (1), a three-phase split dry-type transformer (2), a high-voltage protection and metering cabinet (3), a low-voltage power and communication cabinet (4), and outdoor energy storage converters (51 / 52 / 53); The three-phase split dry-type transformer (2), the high-voltage protection and metering cabinet (3), the low-voltage power and communication cabinet (4), the outdoor energy storage converters (51 / 52 / 53) and the box body shell (6) are all arranged on the integrated machine base (1), and it is characterized in that: The three-phase split dry-type transformer (2) adopts a three-phase split structure combining axial splitting and radial splitting. Among them, the first low-voltage winding and the second low-voltage winding are arranged in an axial splitting manner, and the third low-voltage winding is arranged radially with the first low-voltage winding and the second low-voltage winding to form a radial splitting structure; the third low-voltage winding is arranged outside the first low-voltage winding and the second low-voltage winding; the high-voltage winding is arranged outside the third low-voltage winding.

2. The new energy-efficient integrated box-type substation for new energy according to claim 1, characterized in that: In the high-voltage protection and metering cabinet (3), there are high-voltage circuit breakers, high-voltage disconnectors, high-voltage earthing switches, high-voltage lightning arresters for protecting the three-phase split dry-type transformer (2), and high-voltage current transformers, high-voltage voltage transformers and multi-functional watt-hour meters for metering the high-voltage side of the three-phase split dry-type transformer (2).

3. The new energy-efficient integrated box-type substation for new energy according to claim 1, characterized in that: The three-phase split dry-type transformer (2) is connected to the outdoor energy storage converters (51 / 52 / 53) by a rigid copper busbar, and the rigid copper busbar is protected by a copper busbar channel cover (7).

4. The new energy-efficient integrated box-type substation for new energy according to claim 1, characterized in that: The low-voltage power and communication cabinet (4) integrates functions such as measurement and control, communication, and power, and is provided with components such as a box-type substation comprehensive measurement and control device, a temperature and humidity controller, a dry-type transformer temperature controller, a UPS power supply, and a dual-power switching switch; The equipment is provided with a dual-power conversion switch for automatically switching between the main power supply and the standby power supply.

5. The new energy-efficient integrated box-type substation for new energy according to claim 1, characterized in that: On the box body top cover of the box body shell (6), four outwind centrifugal fans are installed above the three-phase split dry-type transformer (2), an air inlet louver is installed on one side of the dry transformer room wall, and four outwind axial fans are installed on the other side; An air inlet hole is opened at the bottom plate of the integrated machine base (1) below the three-phase split dry-type transformer (2), and cold air enters through the louver and the air inlet hole of the integrated machine base bottom plate. The top cover centrifugal fans extract hot air, and the wall axial fans extract hot air; The bottom of the three-phase split dry-type transformer (2) is equipped with a cross-flow fan for blowing.

6. The new energy-efficient integrated box-type substation for new energy according to claim 1, characterized in that: A high-voltage cable inlet hole (311) is formed on the base (1) of the all-in-one machine. A detachable cable bottom plate and a cable hoop are installed on the inlet hole, and the high-voltage cable passes through the high-voltage cable inlet hole (311) in sequence.

7. The new energy efficient energy storage converter and booster integrated box-type substation according to claim 1, characterized in that: The secondary cable inlet holes (411, 412) are formed on the base (1) of the all-in-one machine. A detachable tower-shaped sealing ring is installed on the inlet hole, and the secondary communication cables such as the secondary communication cables pass through the secondary cable inlet holes (411, 412) in sequence.

8. The new energy efficient energy storage converter and booster integrated box-type substation according to claim 1, characterized in that: The converter DC cable inlet holes (511, 521, 531) are formed on the base (1) of the all-in-one machine. A detachable cable bottom plate and a cable hoop are installed on the inlet hole, and the converter DC cables pass through the converter DC cable inlet holes (511, 521, 531) in sequence.

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