CN219875141U

CN219875141U - Prefabricated energy storage system

Info

Publication number: CN219875141U
Application number: CN202320897732.XU
Authority: CN
Inventors: 王刚; 刘智亮; 蒙玉宝; 陈翔
Original assignee: Wuhan Eve Energy Storage Co ltd
Current assignee: Wuhan Eve Energy Storage Co ltd
Priority date: 2023-04-20
Filing date: 2023-04-20
Publication date: 2023-10-20
Anticipated expiration: 2033-04-20

Abstract

The utility model relates to a prefabricated energy storage system comprising: the system comprises a first prefabricated cabin and a second prefabricated cabin, wherein at least one of the first prefabricated cabin is connected with the second prefabricated cabin and is stacked with the second prefabricated cabin; a plurality of battery clusters and a plurality of first fire-fighting modules are arranged in the first prefabricated cabin, the number of the first fire-fighting modules is greater than or equal to that of the battery clusters, and each battery cluster is arranged corresponding to one first fire-fighting module; the second prefabricated cabin is provided with a voltage output module, a transformer and a PCS module, the PCS module is used for converting direct current output by the battery cluster into alternating current, the transformer is used for transforming the alternating current formed after the conversion of the PCS module, and the voltage output module is used for outputting the alternating current after the transformation. The occupied area of the energy storage system can be reduced, and maintenance personnel can conveniently maintain the energy storage system.

Description

Prefabricated energy storage system

Technical Field

The utility model relates to the technical field of batteries, in particular to a prefabricated energy storage system.

Background

At present, a prefabricated storage mode is mainly adopted on a direct current side in an energy storage power station, namely a battery cluster, a cable confluence cabinet, a fire-fighting cabinet, an air conditioner and the like are placed in one prefabricated cabin, and a prefabricated cabin mode is also adopted in an integral boosting and inverting cabin, namely a PCS (Power Conversion System, energy storage converter), a transformer, a high-voltage box and the like are placed in one prefabricated cabin. The direct current side and the boost inversion integrated cabin are divided into two prefabricated cabins, the prefabricated cabins are mounted on the ground in a tiled mode, the occupied area is large, the civil engineering cost is high, maintenance personnel need to operate the prefabricated cabins on the direct current side and the boost inversion integrated cabin respectively, and maintenance is inconvenient.

Disclosure of Invention

Based on the foregoing, it is necessary to provide a prefabricated energy storage system, which can reduce the occupied area of the energy storage system and is convenient for maintenance personnel to maintain.

In a first aspect, the present utility model provides a prefabricated energy storage system comprising:

the system comprises a first prefabricated cabin and a second prefabricated cabin, wherein at least one of the first prefabricated cabin is connected with the second prefabricated cabin and is stacked with the second prefabricated cabin;

a plurality of battery clusters and a plurality of first fire-fighting modules are arranged in the first prefabricated cabin, the number of the first fire-fighting modules is greater than or equal to that of the battery clusters, and each battery cluster is arranged corresponding to one first fire-fighting module;

the second prefabricated cabin is provided with a voltage output module, a transformer and a PCS module, the PCS module is used for converting direct current output by the battery cluster into alternating current, the transformer is used for transforming the alternating current formed after the conversion of the PCS module, and the voltage output module is used for outputting the alternating current after the transformation.

In one embodiment, the first prefabricated cabin comprises an installation space and a passage space;

a plurality of first independent spaces are arranged in the installation space, and each first independent space is provided with one battery cluster and a corresponding first fire-fighting module;

the passage space is used for communicating the first prefabricated cabin and the second prefabricated cabin.

In one embodiment, a first temperature controller is further disposed in each of the first independent spaces, for performing temperature adjustment on the first independent spaces.

In one embodiment, the channel space is further provided with a first cable module, and the power harness and the communication harness of the battery cluster are converged on the first cable module.

In one embodiment, a first safety door is arranged between the passage space and the installation space, and the first safety door is used for isolating the battery cluster and the passage space in the installation space.

In one embodiment, the second prefabricated cabin comprises a second independent space and a third independent space, wherein a second safety door is arranged between the second independent space and the third independent space;

the transformer and the PCS module are arranged in the second independent space, the voltage output module is arranged in the third independent space, the voltage output module comprises a high-voltage output unit, a low-voltage output unit, a high-voltage protection unit and a low-voltage protection unit, the high-voltage output unit and the low-voltage output unit respectively output high voltage and low voltage after transformation, and the high-voltage protection unit and the low-voltage protection unit respectively conduct voltage protection on the high-voltage output unit and the low-voltage output unit.

In one embodiment, the second independent space is further provided with a second cable module, and the second cable module is used for collecting the power harness and the communication harness output by the first cable module.

In one embodiment, the second prefabricated cabin is further provided with a fourth independent space, and a third safety door is arranged between the fourth independent space and the second independent space;

the second temperature controller is used for adjusting the temperature of the second prefabricated cabin, the EMS module is electrically connected with the second cable module and used for remotely controlling the prefabricated energy storage system according to signals transmitted by the power wire harness and the communication wire harness, the UPS module is used for supplying power to the first prefabricated cabin and elements in the second prefabricated cabin, and the second fire-fighting module is used for performing fire fighting on the second prefabricated cabin.

In one embodiment, the first and second fire modules each comprise: alarm, first gas exhaust device, second gas exhaust device, liquid shower nozzle, gas shower nozzle and fire detector.

The second prefabricated cabin further comprises a fifth independent space, and a fourth safety door is arranged between the fifth independent space and the fourth independent space;

and the fifth independent space is provided with a comprehensive control module for controlling the energy storage work of the prefabricated energy storage system.

The foregoing describes a prefabricated energy storage system comprising: the first prefabricated cabin and the second prefabricated cabin are stacked, and at least one of the first prefabricated cabin and the second prefabricated cabin is arranged; a plurality of battery clusters and a plurality of first fire-fighting modules are arranged in the first prefabricated cabin, the number of the first fire-fighting modules is greater than or equal to that of the battery clusters, and each battery cluster is arranged corresponding to one first fire-fighting module and used for independently extinguishing fire of the corresponding battery cluster; the second prefabricated cabin is provided with a voltage output module, a transformer and a PCS module, the PCS module is used for converting direct current output by the battery cluster into alternating current, the transformer is used for transforming the alternating current formed after the conversion of the PCS module, and the voltage output module is used for outputting the alternating current after the transformation. Because first prefabricated cabin and second prefabricated cabin pile up the setting, consequently reducible energy storage system's area occupied, in addition, set up in the first prefabricated cabin and be the battery cluster, and the control module of battery cluster, like voltage output module, transformer and PCS module all set up in the prefabricated cabin of second, with battery cluster and control module separation setting, make things convenient for the maintenance personal to maintain, finally, because each battery cluster all corresponds a first fire control module, each battery cluster all can carry out independent fire control through its corresponding first fire control module from this, safety, effectually.

Drawings

Fig. 1 is a schematic structural diagram of a prefabricated energy storage system according to an embodiment of the present utility model;

fig. 2 is a schematic view of the structure of the first prefabricated cabin shown in fig. 1.

Detailed Description

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs; the terminology used in the description of the applications herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model; the terms "comprising" and "having" and any variations thereof in the description of the utility model and the claims and the description of the drawings above are intended to cover a non-exclusive inclusion. The terms first, second and the like in the description and in the claims or in the above-described figures, are used for distinguishing between different objects and not necessarily for describing a sequential or chronological order.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the utility model. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

In order to make the person skilled in the art better understand the solution of the present utility model, the technical solution of the embodiment of the present utility model will be clearly and completely described below with reference to the accompanying drawings.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a prefabricated energy storage system according to an embodiment of the utility model. As shown in fig. 1, the prefabricated energy storage system 100 comprises a first prefabricated compartment 101 and a second prefabricated compartment 102 arranged in a stack, at least one of the first prefabricated compartment 101 being connected to said second prefabricated compartment 102, in particular connectable by means of a rotating staircase 103. The first prefabricated compartment 101 controls the components, e.g. battery clusters, etc., within the second prefabricated compartment 102. Where the first prefabricated compartment 101 is one, the first prefabricated compartment 101 may be the bottom layer, the second prefabricated compartment 102 may be the top layer, or the first prefabricated compartment 101 may be the top layer, and the second prefabricated compartment 102 may be the bottom layer. In practical application, a plurality of first prefabricated cabins 101 may be set according to practical situations, and the plurality of first prefabricated cabins 101 may be in a vertically stacked relationship with the second prefabricated cabins 102, or a part of the plurality of first prefabricated cabins 101 and the second prefabricated cabins 102 are in a vertically stacked relationship, and another part of the plurality of first prefabricated cabins and the second prefabricated cabins 102 are in a horizontally tiled relationship, and a connection relationship between the first prefabricated cabins 101 and the second prefabricated cabins 102 may be determined according to practical situations. The first prefabricated cabin 101 and the second prefabricated cabin 102 of this embodiment are assembled by adopting heat-insulating and fireproof prefabricated plates, so that the prefabricated cabin is convenient to assemble and disassemble quickly, light in weight and convenient to transport, reusable and cost-saving.

Referring to fig. 2 together, fig. 2 is a schematic structural view of the first prefabricated cabin shown in fig. 1. A plurality of battery clusters 110 and a plurality of first fire modules 111 are disposed within the first pre-chamber 101.

Each battery cluster 110 is a battery assembly formed by connecting battery cells in series, parallel or both, and realizing independent operation after being connected with an energy storage converter (PCS module) and an accessory facility. The plurality of battery clusters 110 are arranged in a matrix.

The number of the first fire modules 111 is greater than or equal to the number of the battery clusters 110, and each battery cluster 110 is corresponding to one first fire module 111. In an embodiment, the number of the first fire modules 111 may be greater than the number of the battery clusters 110, that is, after each battery cluster 110 is disposed corresponding to one first fire module 111, there is an excess first fire module 111, which may be disposed at other positions of the first prefabricated cabin 101, for example, on the aisles of two adjacent rows or columns of the battery clusters 110, or at two end positions of the first prefabricated cabin 110, etc. In another embodiment, the number of first fire modules 111 may be equal to the number of battery clusters 110, i.e., each battery cluster 110 is provided for one first fire module 111.

The second prefabricated cabin 102 is provided with a voltage output module 121, a transformer 122 and a PCS module 123, wherein the PCS module 123 is configured to convert direct current output by the battery cluster 110 into alternating current, the transformer 122 is configured to transform alternating current formed after the conversion of the PCS module 123, and the voltage output module 121 is configured to output the transformed alternating current.

Thus, the use of two prefabricated cabins in a stacked arrangement in this embodiment may reduce the footprint of the energy storage system 100. In addition, the battery cluster 110 is disposed in the first prefabricated cabin 101, and the control modules of the battery cluster 110, such as the voltage output module 121, the transformer 122 and the PCS module 123, are all disposed in the second prefabricated cabin 102, so that the battery cluster 110 and the control modules are separately disposed, and when maintenance is required, a maintenance person enters a prefabricated container (the second prefabricated cabin 102) to check and maintain the control modules of the battery cluster 110 of the first prefabricated cabin 101, thereby reducing the workload of the maintenance person and operation and maintenance. Finally, each battery cluster 110 corresponds to one first fire-fighting module 111, so that each battery cluster 110 can perform independent fire fighting through the corresponding first fire-fighting module 111, and the system is safe and effective.

In one embodiment, as shown in fig. 1, the first prefabricated compartment 101 includes an installation space 116 and a passage space 117 that communicate. The installation space 116 is used to provide the battery cluster 110 and the like. Specifically, a plurality of first independent spaces 112 are provided in the installation space 116. One of the battery clusters 110 and a corresponding one of the first fire modules 111 are disposed in each of the first independent spaces 112. The adjacent first independent spaces 112 are separated by the partition plates, namely, the first independent spaces 112 can be surrounded by the partition plates, and each independent space 112 is internally provided with the battery cluster 110 and the first fire-fighting module 111, so that each independent battery cluster 110 can independently fight fire, when one battery cluster 110 has a problem, the other battery clusters 110 are not influenced, and the safety of the battery cluster 110 is improved.

The first fire module 111 includes: an alarm 1111, a first gas discharge device 1112, a second gas discharge device 1113, a liquid jet 1114, a gas jet 1115, and a fire detector 1116. The alarm 111 is a deflation indicator light audible and visual alarm for emitting an alarm sound and alarm light to indicate that the corresponding battery cluster 110 needs to be deflated. The first gas exhaust device 112 may be an explosion-proof pressure release valve for opening when the gas pressure of the first independent space 112 where the battery cluster 110 is located is greater than or equal to a preset threshold value, so as to exhaust the gas pressure of the first independent space 112 outside the first prefabricated cabin 101. The second air discharge means 1113 may be an electric shutter which is also opened when the air pressure of the first independent space 112 is greater than or equal to a preset threshold value to discharge the air pressure of the first independent space 112 to the outside of the first pre-chamber 101. The first gas exhaust device 1112 and the second gas exhaust device 1113 may be used simultaneously or independently, for example, when the air pressure in the first independent space 112 is greater than or equal to a preset threshold value, the first gas exhaust device 1112 is first selected, and if the first gas exhaust device 1112 fails, the second gas exhaust device 1113 is started to operate. The present utility model is not limited to the order of use and conditions of interaction of the first gas discharge means 1112 and the second gas discharge means 1113. The liquid spray head 1114 and the gas spray head 1115 are used to supply liquid and gas, respectively, to the first independent space 112 for fire fighting. The fire detector 1116 may be a CO and combustible gas suction type fire detector, and may detect CO and combustible gas in the first independent space 112, and report the detected CO and combustible gas to a corresponding controller, where the controller controls the alarm 1111, the first gas exhaust 1112, the second gas exhaust 1113, the liquid spray 1114, and the gas spray 1115 to operate according to the report.

A passage space 117 is used for communicating the first prefabricated compartment 101 and the second prefabricated compartment 102, a rotary stair 103 may be disposed in the passage space 117, a first safety door 115 is disposed between the passage space 117 and the installation space 116, and the first safety door 115 is used for isolating the battery cluster 110 and the passage space 117 in the installation space 116, i.e., isolating the battery cluster 110 and the second prefabricated compartment 102. If a problem occurs in an element in the installation space 116, such as the battery cluster 110, the first safety door 115 is opened, and a serviceman can enter the passage space 117 by rotating the stairs 103, and thus enter the installation space 116 through the opened first safety door 115 to reach the battery cluster 110 in question. Under normal conditions, when personnel are not required to enter the installation space 116, the first safety door 115 can be closed, so that electric isolation and fire protection isolation are realized, and personnel safety is improved.

The first prefabricated cabin 101 is further provided with a plurality of first temperature controllers 113, and each of the battery clusters 110 corresponds to one of the first temperature controllers 113. The first temperature controller 113 may be disposed in the first independent space 112. The first temperature controller 113 may be an air conditioner and a temperature sensor, and detects the temperature in the first independent space 112 and/or the temperature of the battery cluster 110 through the temperature sensor, and then controls the on/off of the air conditioner according to the temperature, so as to regulate the temperature of the first independent space 112. That is, the first prefabricated cabin 101 adopts centralized temperature control, and meanwhile, each battery cluster 110 corresponds to an independent first temperature controller 113, and a temperature sensing detector of the first temperature controller 113 controls the opening and closing of an air conditioner corresponding to each independent battery cluster 110 according to the temperature in the first independent space 112 and/or the temperature of the battery cluster 110, so that independent temperature control is realized, the temperature is accurately controlled, and energy conservation and environmental protection are realized.

The passage space 117 of the first prefabricated compartment 101 is provided with a first cable module 114, in particular a cable cabinet, for converging the power and communication harnesses of the battery cluster 110. Since the first safety door 115 is provided between the passage space 117 and the installation space 116. Under the condition that the normal battery cluster 110 is normal, the first safety door 115 can be closed, and a maintainer can carry out inspection and maintenance on the first cable module 114 only by entering the channel space 117, so that the safety of the maintainer is improved.

The second prefabricated compartment 102 includes a second independent space 124, a third independent space 125, a fourth independent space 134, and a fifth independent space 137. Wherein a second safety door 127 is disposed between the second independent space 124 and the third independent space 125, a third safety door 135 is disposed between the fourth independent space 134 and the second independent space 124, and a fourth safety door 126 is disposed between the fifth independent space 137 and the fourth independent space 134. The third independent space 125 and the fifth independent space 137 are respectively disposed at two end positions of the second prefabricated cabin 102, a fifth safety door 128 is further disposed at a side of the third independent space 125 away from the second independent space 124, and a sixth safety door 138 is further disposed at a side of the fifth independent space 137 away from the fourth independent space 134. The rotating stairs 103 are arranged in the fifth independent space 137. Maintenance personnel may access the interior of the second prefabricated compartment 102 from either the fifth or sixth security door 128, 138 and then from the corresponding security door of each independent space. The independent spaces may be surrounded by a partition plate, and the material of the partition plate may be the same as that of the first independent space 112.

The transformer 122 and the PCS module 123 are disposed in a second independent space 124. The transformer 122 steps up the voltage of the PCS module 123 and acts as an electrical isolation. The PCS module 123 may include two.

The voltage output module 121 is disposed in the third independent space 125. The voltage output module 121 includes a high voltage output unit 1211, a low voltage output unit 1212, a high voltage protection unit 1213, and a low voltage protection unit 1214. The voltage transformed by the transformer 122 further enters the high voltage output unit 1211, the high voltage is output through the high voltage output unit 1211, and similarly, the voltage transformed by the transformer 122 further enters the low voltage output unit 1212, and the low voltage is output through the low voltage output unit 1212. The high voltage output unit 1211 and the low voltage output unit 1212 are connected to an in-out line cabinet 1215, and the in-out line cabinet 1215 is used for exchanging electrical energy between the prefabricated energy storage system 100 and the outside. The high voltage protection unit 1213 and the low voltage protection unit 1214 provide high voltage and low voltage protection for the high voltage output unit 1211 and the low voltage output unit 1212, respectively.

A second cable module 129 is further disposed in the second prefabricated compartment 102, the second cable module 129 being disposed in the second independent space 124 for collecting the power and communication harnesses output from the first cable module 114. That is, the power and communication harnesses of all the battery clusters 110 in the first prefabricated compartment 101 are collected into the first cable module 114 and then further transferred to the second cable module 129 of the second prefabricated compartment 102, and the second cable module 129 outputs 1 total positive power cable, 1 total negative power cable and 1 total communication line to be connected to the PCS module 123 to convert direct current into alternating current. Because the second cable module 129 gathers the power harness and the communication harness output by the first cable module 114, when the power harness or the communication harness has a problem, the power harness or the communication harness can be directly inspected and maintained at the second cable module 129, so that the inspection and maintenance of maintenance personnel are facilitated.

The second prefabricated cabin 102 is further provided with a second temperature controller 130, an EMS (Battery Management System, power battery management system) module 131, a UPS (Uninterruptible Power Systems uninterruptible power supply) module 132, and a second fire protection module 133, and the second temperature controller 130, the EMS module 131, the UPS module 132, and the second fire protection module 133 are provided in the fourth independent space 134.

The second temperature controller 130 may be an air conditioner that controls cooling, heating, humidification, etc. of the entire deck of the second prefabricated cabin 102. The UPS module 132 is configured to supply power to the components in the first prefabricated cabin 101 and the second prefabricated cabin 102, for example, to provide power for the first temperature controller 113, the second temperature controller 130, the first fire module 111, the second fire module 133, the lighting system, power distribution, video monitoring, etc. of the prefabricated energy storage system 100. The EMS module 130 is electrically connected to the second cable module 129, and is configured to remotely control the prefabricated energy storage system 100 according to signals transmitted by the power harness and the communication harness. Specifically, the power signals transmitted by the power wire harness, the communication signals transmitted by the communication wire harness and other signals are transmitted to the EMS module 131, the EMS module 131 realizes on-site checking and control according to the signals, and meanwhile, the EMS module 131 transmits the signals to the background to realize remote checking and control.

The second fire module 133 is identical to the first fire module 111 and includes an alarm, a first gas discharge device, a second gas discharge device, a liquid spray head, a gas spray head, and a fire detector. The second fire module 133 corresponds to the entire second prefabricated cabin 102, and is a fire protection system for the second prefabricated cabin 102.

The second prefabricated compartment 102 is further provided with an integrated control module 136, the integrated control module 136 being provided in the fifth independent space 137. The integrated control module 136 is used to produce the energy storage operation of the prefabricated energy storage system 100. In an embodiment, the integrated control module 136 provides a control port for a worker to control the energy storage operation of the prefabricated energy storage system 100 in the second prefabricated cabin 102, and the integrated control module 136 can control the charge and discharge, video monitoring, fire protection, communication, etc. of the whole energy storage system 100 in situ in the second prefabricated cabin 102, so as to reduce the workload of operation and maintenance personnel and operation and maintenance.

In summary, the prefabricated energy storage system of the present utility model includes a first prefabricated cabin and a second prefabricated cabin that are stacked; a plurality of battery clusters and a plurality of first fire-fighting modules are arranged in the first prefabricated cabin, the number of the first fire-fighting modules is greater than or equal to that of the battery clusters, and each battery cluster is arranged corresponding to one first fire-fighting module; the second prefabricated cabin is provided with a voltage output module, a transformer and a PCS module. The occupied area of the energy storage system can be reduced, and maintenance personnel can conveniently maintain the energy storage system. In addition, set up in the first prefabricated cabin is the battery cluster, and the control module of battery cluster, like voltage output module, transformer and PCS module all set up in the prefabricated cabin of second, with battery cluster and control module separation setting, make things convenient for maintenance personnel to maintain, finally, because each battery cluster all corresponds a first fire control module, each battery cluster all can carry out independent fire control through its corresponding first fire control module from this, safety, effectually.

The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The foregoing examples illustrate only a few embodiments of the utility model and are described in detail herein without thereby limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of the utility model should be assessed as that of the appended claims.

Claims

1. A prefabricated energy storage system, the prefabricated energy storage system comprising:

2. The prefabricated energy storage system of claim 1, wherein said first prefabricated compartment comprises an installation space and a passage space;

3. The prefabricated energy storage system of claim 2, wherein a first temperature controller is further disposed in each of said first independent spaces for temperature conditioning said first independent spaces.

4. The prefabricated energy storage system of claim 2, wherein the channel space is further provided with a first cable module, and the power harness and the communication harness of the battery cluster are converged on the first cable module.

5. The prefabricated energy storage system according to any one of claims 2-4, wherein a first safety door is provided between the access space and the installation space, the first safety door being used for isolating the battery cluster and the access space in the installation space.

6. The prefabricated energy storage system of claim 4, wherein said second prefabricated compartment comprises a second independent space and a third independent space, wherein a second safety door is disposed between said second independent space and said third independent space;

the transformer and the PCS module are arranged in the second independent space, the voltage output module is arranged in the third independent space, the voltage output module comprises a high-voltage output unit, a low-voltage output unit, a high-voltage protection unit and a low-voltage protection unit, the voltage transformed by the transformer is respectively input into the high-voltage output unit and the low-voltage output unit to respectively output high voltage and low voltage, and the high-voltage protection unit and the low-voltage protection unit respectively conduct voltage protection on the high-voltage output unit and the low-voltage output unit.

7. The prefabricated energy storage system of claim 6, wherein said second independent space is further provided with a second cable module for gathering power and communication harnesses output by said first cable module.

8. The prefabricated energy storage system of claim 7, wherein said second prefabricated compartment further provides a fourth independent space, a third safety door being provided between said fourth independent space and said second independent space;

9. The prefabricated energy storage system of claim 8, wherein the first and second fire modules each comprise: alarm, first gas exhaust device, second gas exhaust device, liquid shower nozzle, gas shower nozzle and fire detector.

10. The prefabricated energy storage system of claim 8, wherein said second prefabricated compartment further comprises a fifth independent space, a fourth safety door disposed between said fifth independent space and said fourth independent space;