CN111133663A

CN111133663A - Integrated power conversion and grid connection system

Info

Publication number: CN111133663A
Application number: CN201880060307.7A
Authority: CN
Inventors: 李在杰
Original assignee: LSIS Co Ltd
Current assignee: LS Electric Co Ltd
Priority date: 2017-10-30
Filing date: 2018-10-23
Publication date: 2020-05-08
Also published as: KR20190048081A; JP2020529819A; WO2019088550A1

Abstract

The integrated power conversion and grid-connected system of the embodiment of the invention comprises: a power conversion unit that performs power conversion between direct-current power and alternating-current power; a transformer that converts a voltage of the alternating-current power; a switch cabinet unit that performs a disconnection operation based on a state of a line in the integrated power conversion and grid-connected system; and a container in which the power conversion unit, the transformer, and the switch cabinet unit are provided.

Description

Integrated power conversion and grid connection system

Technical Field

The present invention relates to an integrated power conversion and grid-connection system configured by integrating a series of devices such as a power conversion device, a protection device, a metering device, and a device for connecting a power system, which are provided in a new renewable energy power generation system or ESS.

Background

Systems such as Energy Storage Systems (ESS) or photovoltaic power generation systems may include: a power conversion device that converts the electric power stored in the battery or the electric power generated by the photovoltaic panel; means for connecting with a power system; a metering device for metering a transmitted power amount or a received power amount of electric power; and a protection device for protecting the various devices and equipment described above.

In the case of the prior art, the various apparatuses and the various devices are made as independent device units and installed separately in the field. The ESS or photovoltaic power generation system may then be configured by connecting power or communication cables, etc. between the devices.

According to such a conventional method, an installation area for installing each device is increased, and a wiring work for laying a cable between the devices, a cable trench construction process, and the like are increased, so that an installation period may be increased, and an excessively long field test period may be required. Also, as each device is made in an outdoor type to increase the size of a product, separate housings are made according to the characteristics of the product, thereby causing an increase in cost and also having a difficulty in maintenance after installation of the device.

Disclosure of Invention

Problems to be solved by the invention

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an integrated power conversion and grid-connection system in which a series of devices such as a power conversion device, a protection device, a measurement device, and a device for connecting a power system, which are provided between a new renewable energy power generation device and the power system or between a battery and the power system, are integrated in a new renewable energy power generation system or an ESS.

Means for solving the problems

The integrated power conversion and grid connection system of the embodiment of the invention comprises: a power conversion unit that performs power conversion between direct-current power and alternating-current power; a transformer that converts a voltage of the alternating-current power; a switch cabinet unit that performs a disconnection operation based on a state of a line in the integrated power conversion and grid-connected system; and a container in which the power conversion unit, the transformer, and the switch cabinet unit are provided.

According to an embodiment, the container may include a plurality of areas, and the power conversion part, the transformer, and the switch cabinet part are separated from each other and installed at the plurality of areas.

According to an embodiment, the container includes a plurality of partition walls dividing the plurality of regions, and an opening portion through which a connection device for connecting lines between the power conversion portion, the transformer, and the switch cabinet portion passes may be formed at each of the plurality of partition walls.

According to an embodiment, each of the plurality of partition walls may be composed of an insulating material including a flame-retardant polyurethane foam or a sandwich panel.

According to an embodiment, each of the plurality of regions may have a different waterproof and shockproof rating based on the installed configuration.

According to an embodiment, the container housing in each of the plurality of areas may be provided with at least one of a door, a ventilation port, and a window, based on a constitution of the container mounted in each of the plurality of areas.

According to an embodiment, the power conversion part includes a Power Conversion System (PCS) connected to a battery to convert dc power stored in the battery into ac power, and a container case of a first region of the plurality of regions in which the power conversion part is disposed may be provided with an air intake port and an air exhaust port.

The suction port is provided in the container case of the first region to be opposite to the suction port provided in the PCS, and the exhaust port may be provided at an upper side of the PCS.

According to an embodiment, the battery may be disposed within the container.

According to an embodiment, the power conversion part may include a Photovoltaic (PV) inverter that converts direct current power supplied from a photovoltaic panel into alternating current power.

The integrated power conversion and grid connection system may further include a Ring Main Unit (RMU) which connects a plurality of integrated power conversion and grid connection systems and transfers power supplied from each of the plurality of integrated power conversion and grid connection systems to a main power room or a power system, or to other integrated power conversion and grid connection systems.

The switch cabinet portion may include: a low-voltage switchgear unit configured to perform a disconnection operation of a low-voltage line between the power conversion unit and the transformer, based on a state of the low-voltage line; and a high-voltage switchgear unit configured to perform a disconnection operation of a high-voltage line between the transformer and the power system, based on a state of the high-voltage line.

Effects of the invention

According to various embodiments of the present invention, a power conversion and grid-connection system including a power conversion part, a low-voltage switchgear part, a transformer, a high-voltage switchgear part, and the like may be integrated in one container. The container constructed as one body is transported and installed to the site, so that the transportation and installation of the system can be facilitated and the occupied space can be minimized.

In addition, since the line connection between the respective structures is already completed in the container, it is not necessary to perform an additional cable laying work or the like on the site, and thus the installation time can be effectively saved.

Furthermore, the structures of the plurality of power conversion and grid-connected systems are separated from each other and installed in a plurality of areas in the container, so that the environment in the areas can be optimized according to the types of the structures.

Drawings

Fig. 1 is a schematic block diagram of an overall system including an integrated power conversion and grid tie system showing an embodiment of the present invention.

Fig. 2 is a block diagram showing the configuration of the integrated power conversion and grid connection system of the embodiment of the present invention.

Fig. 3 is a perspective view showing an external appearance of the integrated power conversion and grid connection system according to the embodiment of the present invention.

Fig. 4 is a right and left side view of the integrated power conversion and grid tie system shown in fig. 3.

Fig. 5 is a plan view of the integrated power conversion and grid connection system shown in fig. 3.

Fig. 6 is a cross-sectional view of the integrated power conversion and grid tie system shown in fig. 5 taken along line a-a.

Fig. 7 is a cross-sectional view taken along line B-B for explaining a flow path formed for cooling the power conversion device included in the integrated power conversion and grid-connected system according to the embodiment of the present invention.

Fig. 8 is a top view of an integrated power conversion and grid tie system according to another embodiment of the present invention.

Fig. 9 is a plan view of an integrated power conversion and grid connection system according to still another embodiment of the present invention.

Fig. 10 is a diagram for explaining a photovoltaic power generation system provided with the integrated power conversion and grid-connection system shown in fig. 9.

Detailed Description

Hereinafter, embodiments disclosed in the present specification will be described in detail with reference to the accompanying drawings, and the same or similar constituent elements will be denoted by the same reference numerals regardless of the reference numerals, and repeated description thereof will be omitted. The suffixes "module" and "portion" of the constituent elements used in the following description are merely labeled or mixed in consideration of the easy writing of the specification, and do not have meanings or functions distinguished from each other by themselves. Also, in describing the embodiments disclosed in the present specification, if it is judged that detailed description of related well-known technologies may obscure the subject matter of the embodiments disclosed in the present specification, detailed description will be omitted. The drawings are only for the purpose of facilitating understanding of the embodiments disclosed in the present specification, and the technical idea disclosed in the present specification is not limited by the drawings, but should be understood to cover all modifications, equivalents, and alternatives included in the spirit and technical scope of the present invention.

Terms including ordinal numbers such as first, second, etc., may be used to describe various components, but these components should not be limited by the terms. The terms are used only for the purpose of distinguishing one constituent element from another constituent element.

When a component is referred to as being "connected" or "connected" to another component, it is to be understood that the component may be directly connected or connected to the other component or that other components may be present therebetween. Conversely, when a component is referred to as being "directly connected" or "directly connected" to another component, it is understood that no other component is present therebetween.

Unless the context clearly dictates otherwise, expressions in the singular include expressions in the plural.

The terms "comprising" or "having" and the like in this application should be understood to mean that there are features, numbers, steps, actions, elements, components, or combinations thereof described in the specification, and do not preclude the possibility of one or more other features or numbers, steps, actions, elements, components, or combinations thereof being present or added.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings of the present specification.

Fig. 1 is a schematic block diagram of an overall system including an integrated power conversion and grid tie system illustrating an embodiment of the present invention.

Referring to fig. 1, the power conversion system 10 may be constituted by an integrated power conversion and grid-connection system 10, and the integrated power conversion and grid-connection system 10 includes not only a power conversion device but also a device for system connection integrally.

Such power conversion and grid-tie system 10 may be included in ess (energy storage system), photovoltaic power generation system, wind power generation system, and the like.

In the case where the power conversion and grid-connection system 10 is included in the ESS, the power conversion and grid-connection system 10 may be provided between the battery 20a and the power system 30. The power conversion and grid-connection system 10 may convert the power in the form of alternating current supplied from the power system 30 into the power in the form of direct current, and supply the power in the form of direct current to the battery 20 a. According to the embodiment, the power conversion and grid-connection system 10 converts the electric power in the direct current form stored in the battery 20a into the electric power in the alternating current form, and transmits the electric power in the alternating current form to the power system 30, thereby enabling the electric power stored in the battery 20a to be sold.

In the case where the power conversion and grid connection system 10 is included in a photovoltaic power generation system, the power conversion and grid connection system 10 may be provided between the photovoltaic panel 20b and the power system 30. The power conversion and grid-connection system 10 may convert the power in the form of direct current supplied from the photovoltaic panel 20b into power in the form of alternating current, and deliver the power in the form of alternating current to the power system 30. Similarly, in the case where the power conversion and grid-connection system 10 is included in the wind power generation system, the power conversion and grid-connection system 10 may be provided between the wind power generator 20c and the power system 30. The power conversion and grid-connection system 10 may boost and transmit the power in the form of alternating current supplied from the wind turbine 20c to the power system 30.

Fig. 2 is a block diagram showing a configuration of a power conversion and grid connection system according to an embodiment of the present invention.

Referring to fig. 2, the power conversion and grid-connection system 10 may include a power conversion unit 11, a low voltage switch gear (LV SWGR) 13, a transformer 15, and a high voltage switch gear (medium voltage (MV) SWGR) 17.

The power conversion portion 11 may include a power conversion device 112 and a Power Management System (PMS) 114. In the case where the power conversion and grid-connection system 10 is included in the ESS, the power conversion device 112 may be implemented by a Power Conversion System (PCS) 112 a. On the other hand, when the power conversion and grid-connection system 10 is included in a photovoltaic power generation system, the power conversion device 112 may be realized by a PV inverter 112 b.

PCS112a may include multiple inverters and converters. For example, the PCS112a may convert dc power stored in the battery 20a into ac power and deliver the ac power to the power system 30. According to an embodiment, the PCS112a may also convert ac power supplied from the power system 30 to dc power and store the dc power to the battery 20 a.

The PV inverter 112b can convert dc power supplied by photovoltaic power generation of the photovoltaic panel 20b into ac power. The converted alternating current power may be provided (sold) to the power system 30.

PMS114 may control the overall operation of power conversion and grid-tied system 10. The PMS114 can acquire the operation state, abnormality, power transmission amount, power reception amount information, and the like of various components included in the power conversion and grid connection system 10, and can transmit the acquired information to the external server 40 and the like. The server 40 provides information received from the PMS114 to a system manager, a user, or the like, and can provide a monitoring function for information related to the operation of the power conversion and grid-connected system 10.

LV SWGR13 is provided between power conversion unit 11 and transformer 15, and therefore, when an accident or abnormality such as a short circuit of a low-voltage line occurs, the line can be cut. To this end, LV SWGR13 may include an Air Circuit Breaker (ACB) 132 and a protection relay 134.

When an abnormal state occurs in the line, the ACB132 may shut off the line using compressed air. The ACB132, together with the protective relay 134, can protect the power conversion and grid connection system 10 by quickly detecting elements such as overcurrent, overvoltage, undervoltage, short circuit, and grounding to cut the line.

The transformer 15 may convert the low-voltage ac power converted by the power conversion device 112 into high-voltage ac power corresponding to the voltage of the power system 30, or may convert the high-voltage ac power supplied from the power system 30 into low-voltage ac power. For example, the transformer 15 may be implemented by an oil-immersed transformer or a molded transformer, but is not limited thereto.

MV SWGR17 may be disposed between transformer 15 and power system 30. For example, MV SWGR17 may include: a metering device (MOF) 174 that meters the amount of received power received from the power system 30 or the amount of transmitted power delivered from the power conversion apparatus 112; a Vacuum Circuit Breaker (VCB)172 and a protection relay, which cut off a line when an abnormal state occurs in a high-voltage line between the transformer 15 and the power system 30; and a Load Break Switch (LBS) 176 for switching the rated current of the line.

According to embodiments, LV SWGR13 and MV SWGR17 may also each include a lightning arrester for protecting the components from overvoltage and surge currents caused by lightning strikes or the like.

In the case of the related art, the power conversion section 11, the LV SWGR13, the transformer 15, and the MV SWGR17 are separately fabricated as independent equipment units, and thus there are inconveniences such as an increase in installation area and time at the time of field installation, the need for additional work for laying cables, and the like.

Hereinafter, the integrated power conversion and grid-connection system 10 of the embodiment of the present invention for solving the related art problems as described above will be further described in detail.

Fig. 3 is a perspective view showing an external appearance of an integrated power conversion and grid-connection system according to an embodiment of the present invention, and fig. 4 is right and left views of the integrated power conversion and grid-connection system shown in fig. 3. Fig. 5 is a plan view of the integrated power conversion and grid connection system shown in fig. 3, and fig. 6 is a sectional view of the integrated power conversion and grid connection system shown in fig. 5 taken along line a-a.

Hereinafter, in fig. 3 to 8, a case where the power conversion and grid-connection system 10 is used for the ESS power conversion and grid-connection system will be described as an example. That is, the power conversion device 112 of the power conversion and grid-connected system 10 may correspond to the PCS112 a.

In the present specification, the integral type means that the components of the power conversion and grid-connection system 10 shown in fig. 2 are mounted in a single base frame, the structural body of the housing is formed of a single structure, and all the components and the external structural body can be transported and mounted together in a completely assembled state, and in this case, the structure in which structural deformation or abnormality of internal components does not occur can be expressed.

Referring to fig. 3, the power conversion and grid connection system 10 according to the embodiment of the present invention may be manufactured to be accommodated in one container 100. That is, the container 100 may correspond to a base frame and an external structure of the power conversion and grid-connected system 10. For example, the container 100 has a specification defined by International Standardization Organization (ISO), and thus may have higher environmental resistance and durability than existing outdoor boxes for power equipment.

That is, in the power conversion and grid-connected system 10 of the present invention, the power conversion unit 11, the LV SWGR13, the transformer 15, and the MV SWGR17 are all housed and mounted in one container 100, and are transported to the site and mounted as one unit, so that the transportation and mounting of the system can be facilitated, and the occupied space can be minimized. Further, since the power cable connection between the respective devices is completed in the container 100, an additional cable laying work or the like is not required in the field.

Each of the components of the power conversion and grid-connected system 10 may be disposed in each of a plurality of areas within the container 100 separately from each other. Based on the types of components installed in the areas, ventilation ports (intake and exhaust ports) or doors and the like may be installed in the container casing for each area. According to the embodiment, the level of the waterproof and shockproof (IP) may be different for each region based on the constituent elements provided in each region. That is, by providing the components separately from each other in each of the plurality of regions, it is possible to provide an optimized in-region environment for each component.

In this regard, referring to fig. 4 and 5, the container 100 may be divided into a first region 101 provided with the power conversion part 11, a second region 103 provided with the LV SWGR13, a third region 105 provided with the transformer 15, and a fourth region 107 provided with the MVSWGR 17.

For example, the container case in the first area 101 may be provided with a suction port 101a and an exhaust port 101b, which suction port 101a and exhaust port 101b are used for cooling when the power conversion device 112 is driven. The air inlet 101a and the air outlet 101b may be implemented by louvers (louvers), array windows, or the like. According to an embodiment, a filter or mesh, etc. may be provided at the suction port 101a and the discharge port 101b for protecting the power conversion device 112 inside from dust, foreign substances, etc. Thereby, a prescribed IP level (e.g., IP54 level) can be maintained inside the first area 101.

A flow path for natural cooling of the power conversion device 112 may be formed by the air inlet 101a and the air outlet 101b of the container case provided in the first region 101. In this regard, description will be made in the following description with reference to fig. 7.

The container enclosure in the third area 105 may be provided with

doors

105a, 105b for servicing the transformer 15. The

doors

105a, 105b may be implemented in the form of array windows or the like to prevent performance degradation due to heat generation by the transformer 15. According to the embodiment, the third area 105 may set a filter or mesh, etc. for maintaining an IP level according to the type of the transformer 15 set. For example, in the case where an oil-filled transformer is provided, the oil-filled transformer itself is generally manufactured to have a predetermined IP class, and therefore the filter, mesh, or the like may not be provided. In contrast, in the case of the molded transformer, it is easily affected by the outside, and therefore, the filter or the mesh or the like for keeping the inside of the third region 105 in a state having a prescribed IP level may be provided.

Container enclosures in the second zone 103 and the fourth zone 107 may be provided with

doors

103a, 103b, 107a, 107b to enable ingress and egress of managers for maintenance of LV SWGR13 and MV SWGR 17. According to an embodiment, the inside of the second area 103 and the fourth area 107 may also have a prescribed IP rating.

Referring to fig. 5 and 6, as described above, the PCS112a and the PMS114 may be disposed in the first region 101, and the LV SWGR13 may be disposed in the second region 103. A transformer 15 may be disposed in the third region 105 and a MV SWGR17 may be disposed in the fourth region 107.

For example, in the case of using the ISO-sized container 100 as described above, the capacity of the power conversion apparatus 11 that can be disposed in the first region 101 may be within about 3 MW. In this case, when the capacity of the ESS or the photovoltaic power generation system exceeds 3MW, the plurality of power conversion and grid-connection systems 10 may be connected to each other.

The

various areas

101, 103, 105, 107 of the container 100 may be separated from each other by

partition walls

102, 104, 106. The

respective partition walls

102, 104, and 106 can insulate the plurality of

regions

101, 103, 105, and 107 from each other, and can prevent a specific component from being deteriorated in operation performance or efficiency or from being abnormal due to heat generation of other components. For example, the

partition walls

102, 104, 106 may be constructed of an insulating material such as a flame retardant polyurethane foam or sandwich panel (sandwich panel).

The

components

11, 13, 15, 17 of the power conversion and grid connection system 10 may be connected to each other within the container 100. For example, opening portions may be formed at the

respective partition walls

102, 104, 106, through which connection means implemented by various cables or bus bars (bus bars) or the like may pass. Specifically, the PCS112a and the LV SWGR13 may be connected to each other by a connection device passing through an opening portion formed in the first partition wall 102, and the LV SWGR13 and the transformer 15 may be connected to each other by a connection device passing through an opening portion formed in the second partition wall 104. Also, the transformer 15 and the MV SWGR17 may be connected to each other by a connection device passing through an opening portion formed in the third partition wall 106. The PMS114 provided in the first region 101 can be connected to the

components

13, 15, and 17 provided in each of the

other regions

103, 105, and 107 through the opening.

On the other hand, the PCS112a may be connected to the battery 20a by a connection device passing through the front or side of the container 100, or a battery connection terminal provided on the front or side, and the MV SWGR17 may be connected to the power system 30 by a connection device passing through the back or side of the container 100, or a power system connection terminal provided on the back or side, or the like.

According to embodiments, the container 100 may also include

doors

108, 109 on the front and back sides, respectively. The manager of the power conversion and grid-connected system 10 can perform management operations of the

components

112a, 114, and 17 provided in the first area 101 and the fourth area 107 through the

doors

108 and 109.

Referring to fig. 7, PCS112a may include an intake 1121 and a fan 1122. At this time, the suction port 101a of the container case provided in the first region 101 may be disposed to face the suction port 1121, corresponding to the position of the suction port 1121 of the PCS112 a. Also, the exhaust port 101b may be located on the upper side of the PCS112 a. The fan 1122 may be rotated when the PCS112a is driven or in the case where the temperature inside the PCS112a is higher than the reference temperature. As the fan 1122 rotates, a flow path may be formed to connect the suction port 101a of the container case provided in the first region 101, the suction port 1121 of the PCS112a, and the exhaust port 101b of the container case provided in the first region 101. This allows air to flow into the first region 101 through the air inlet 101 a. The air flowed into the first region 101 may flow into the PCS112a through the suction port 1121 of the PCS112a, and then discharged to the outside through the exhaust port 101b provided at the upper portion of the PCS112a and the container case of the first region 101.

That is, in the case of the embodiment shown in fig. 7, the container 100 forming the appearance of the power conversion and grid-connected system 10 may include the air inlet 101a and the air outlet 101b in the container case of the first region 101 in which the high-heat-generation power conversion device 112 is provided. Since the intake port 101a and the exhaust port 101b are provided, the PCS112a can be efficiently cooled by air circulation. Therefore, an additional cooling device or air conditioning equipment (HVAC) for cooling the PCS112a may not be provided, so that space can be saved, and an additional power loss generated by the driving of the cooling device or air conditioning equipment can be prevented.

Referring to fig. 8, the container 100 may further include a battery 20a connected to the PCS112a of the power conversion and grid connection system 10. For example, the partition wall 201 may be provided between the battery 20a and the power conversion portion 11, but is not necessarily limited thereto, and the battery 20a and the power conversion portion 11 may be provided in the same region.

In the case of the container 100 implemented in the form of fig. 8, it is possible to perform the function of a mobile power supply system that supplies emergency power when power supply is interrupted due to occurrence of various abnormal situations or the like, or when the container is transported to a facility, building, or place that requires power supply, or the like. The MV SWGR17 of the power conversion and grid tie system 10 may be connected to power supply lines of a corresponding facility, building or site. In this case, the power conversion and grid-connection system 10 may supply the power stored in the battery 20a of the container 100 to various devices or equipment of the facility, building or site.

The power conversion and grid-connection system 10 shown in fig. 9 and 10 may be implemented within a photovoltaic power generation system.

The power conversion and grid-tie system 10 implemented within the photovoltaic power generation system may include a PV inverter 112b, PMS114, LV SWGR13, transformer 15, and MV SWGR 17. As shown in fig. 9, in the case of the power conversion and grid-tie system 10 implemented within a photovoltaic power generation system, the PV inverter 112b, PMS114, and LV SWGR13 may also be provided together in a first region 201 within the container 200. In addition, a transformer 15 may be provided in the second region 203, and an MV SWGR17 or a Ring Main Unit (RMU) 18 may be provided in the third region 205.

As the capacity of the photovoltaic power generation system increases, the number of power conversion and grid-connected systems 10 implemented in the photovoltaic power generation system increases. In this case, a plurality of cables and the like are provided so that a large number of power conversion and grid-connected systems 10 are connected to the power system 30, respectively, and a laying work for each cable needs to be performed, so that there is a possibility that installation cost and installation time are increased.

To solve the above problem, as shown in fig. 9, the power conversion and grid connection system 10 may include an RMU18 instead of the MVSWGR 17.

The RMU18 forms a network of the plurality of power conversion and grid-connected systems 10 by implementing connections between the plurality of power conversion and grid-connected systems 10. In this regard, description will be made in the following with reference to fig. 10.

Referring to fig. 10, the power conversion and grid-connection system 10 implemented in one container 200 may transmit power generated from the photovoltaic panel 20b to the power system 30. As described above, when a plurality of power conversion and grid connection systems 10 are included in the photovoltaic power generation system, the power conversion and grid connection systems 10 may be connected to each other through the RMU18, and any one of the power conversion and grid connection systems 10 may be connected to the main power plant 300. Thus, the arbitrary one of the power conversion and grid-connection systems 10 can transmit the electric power supplied from the plurality of power conversion and grid-connection systems 10 to the main power plant 300 or the power system 30 using the RMU18, or can transmit the electric power to another power conversion and grid-connection system 10. According to the embodiment, the plurality of power conversion and grid-connection systems 10 and the main power room 300, or the plurality of power conversion and grid-connection systems 10 and the power system 30 may be connected in a loop (loop) manner.

Master electrical power plant 300 may be located between power system 30 and a plurality of power conversion and grid tie systems 10. The main electric chamber 300 may be provided with various kinds of metering devices, main shut-off devices, and the like. According to an embodiment, the main power plant 300 may also convert the high-voltage (e.g., 22.9kV) ac power transmitted from the plurality of power conversion and grid-connection systems 10 into ultra-high-voltage (e.g., 154kV) ac power and transmit it to the power system 30.

That is, according to the embodiment shown in fig. 10, since the connection device for connecting the plurality of power conversion and grid-connected systems and the power system 30 can be minimized, the installation cost or the installation time for the installation of the connection device can be effectively saved.

Industrial applicability

The present invention can be applied to an integrated power conversion and grid-connection system in which a series of devices such as a power conversion device, a protection device, a metering device, and a device for connecting a power system provided in a new renewable energy power generation system or an ESS are integrated.

Claims

1. An integrated power conversion and grid tie system, comprising:

a power conversion unit that performs power conversion between direct-current power and alternating-current power;

a transformer that converts a voltage of the alternating-current power;

a switch cabinet unit that performs a disconnection operation based on a state of a line in the integrated power conversion and grid-connected system; and

and a container in which the power conversion unit, the transformer, and the switch cabinet unit are provided.

2. The integrated power conversion and grid tie system of claim 1,

the container includes a plurality of areas, and the power conversion part, the transformer, and the switch cabinet part are separated from each other and installed at the plurality of areas.

3. The integrated power conversion and grid tie system of claim 2,

the container includes a plurality of partition walls dividing a plurality of the regions,

an opening portion through which a connection device for connecting lines between the power conversion portion, the transformer, and the switch cabinet portion passes is formed in each of the plurality of partition walls.

4. The integrated power conversion and grid tie system of claim 3,

each of the plurality of partition walls is composed of a flame-retardant polyurethane foam or a sandwich panel.

5. The integrated power conversion and grid tie system of claim 2,

each of the plurality of zones has a different waterproof and shockproof rating based on the installed configuration.

6. The integrated power conversion and grid tie system of claim 2,

based on the constitution of each of the plurality of areas, the container case in each of the plurality of areas is provided with at least one of a door, a ventilation port, and a window.

7. The integrated power conversion and grid tie system of claim 2,

the power conversion unit includes a power conversion system that is connected to a battery and converts direct-current power stored in the battery into alternating-current power,

the container case of a first region of the plurality of regions in which the power conversion section is provided with an air intake port and an air exhaust port.

8. The integrated power conversion and grid tie system of claim 7,

the air inlet is arranged on the container shell of the first area in a manner of being opposite to the air inlet arranged on the power conversion system,

the exhaust port is provided to be located at an upper side of the power conversion system.

9. The integrated power conversion and grid tie system of claim 7,

the battery is disposed within the container.

10. The integrated power conversion and grid tie system of claim 1,

the power conversion section includes a PV inverter that converts direct-current power supplied from a photovoltaic panel into alternating-current power.

11. The integrated power conversion and grid tie system of claim 10,

the power grid-connected system comprises a main power chamber, a grid-connected system and a ring main unit, wherein the main power chamber is connected with the main power chamber, the grid-connected system is connected with the ring main unit, and the ring main unit is used for transmitting power supplied by each of the plurality of integrated power conversion and grid-connected systems to the main power chamber or the power system or transmitting the power to other integrated power conversion and grid-connected systems.

12. The integrated power conversion and grid tie system of claim 1,

the switch cabinet portion includes:

a low-voltage switchgear unit configured to perform a disconnection operation of a low-voltage line between the power conversion unit and the transformer, based on a state of the low-voltage line; and

and a high-voltage switchgear unit configured to perform a disconnection operation of a high-voltage line between the transformer and the power system, based on a state of the high-voltage line.