CN216436820U - Inverter direct-current side coupling energy storage system - Google Patents
Inverter direct-current side coupling energy storage system Download PDFInfo
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- CN216436820U CN216436820U CN202122869458.9U CN202122869458U CN216436820U CN 216436820 U CN216436820 U CN 216436820U CN 202122869458 U CN202122869458 U CN 202122869458U CN 216436820 U CN216436820 U CN 216436820U
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Abstract
The utility model discloses an inverter direct current side coupling energy storage system, including photovoltaic inverter, a plurality of groups photovoltaic module, direct current converter and energy storage battery cluster, the direct current collection flow box, auxiliary transformer, distribution system, the bus connection electric wire netting is passed through to photovoltaic inverter one end, photovoltaic module and direct current converter are connected respectively to the other end, distribution system passes through auxiliary transformer and connects the generating line in order to give photovoltaic inverter, the direct current converter power supply, at least two sets of photovoltaic module are connected to photovoltaic inverter through same direct current collection flow box, every direct current converter is connected with a set of energy storage battery cluster. Because the direct current side coupling energy storage system is connected to the power grid through the direct current side of the photovoltaic inverter, only the direct current converter with the corresponding voltage grade of the direct current side of the photovoltaic inverter needs to be configured, compared with the alternating current side coupling energy storage system, a transformer can be omitted, the overall efficiency is obviously improved, and for the photovoltaic system with high volume ratio, the configuration number of the photovoltaic inverter can be reduced, so that the system cost is greatly reduced.
Description
Technical Field
The utility model relates to a photovoltaic power generation technical field especially relates to an inverter direct current side coupling energy storage system.
Background
The traditional photovoltaic energy storage system adopts an inverter alternating current side coupling energy storage system to store photovoltaic power generation, the inverter alternating current side coupling energy storage system is connected to a power grid through a photovoltaic inverter alternating current side, and the grid-connected voltage grade of the inverter alternating current side coupling energy storage system is required to be consistent with the voltage of the inverter alternating current side.
In the market, the grid-connected photovoltaic inverter outlet voltage is generally 800V, so that the grid-connected voltage of an energy storage system is 800V, while the outlet voltage of most energy storage converters cannot reach 800V, and therefore a boosting isolation transformer needs to be configured. The boosting isolation transformer is used for enabling the energy storage converter to be safely isolated from a grid-connected point, and most energy storage converters in the current market are integrated with the isolation transformer to achieve safe isolation from the grid-connected point.
Wherein, energy storage converter export voltage does not match with the point of connection voltage, specifically divide into following two kinds of circumstances: firstly, after the energy storage converter is integrated with an isolation transformer, when the voltage level of the output side of the isolation transformer is still not matched with the voltage level of a grid-connected point, a step-up/step-down transformer needs to be additionally configured, and the system efficiency is lower in the case; and secondly, when the energy storage converter is not integrated with an isolation transformer and the voltage grade of the output side of the energy storage converter is not matched with the voltage grade of a grid-connected point, a step-up/step-down transformer also needs to be configured. In any case, it can be seen that it is inevitable to additionally configure the boost/buck isolation transformer in the ac-side coupled energy storage system of the photovoltaic inverter.
In addition, in the ac side coupling energy storage system of the pv inverter, in order to ensure that the energy storage system has sufficient electric quantity to absorb, the configuration capacity of the pv inverter needs to be increased to be the same as the component capacity, and for a high-capacity-ratio sub-square matrix (the capacity ratio is greater than or equal to 1.4), the configuration number of the pv inverters needs to be increased considerably, which may increase the cost of the energy storage system.
SUMMERY OF THE UTILITY MODEL
In view of the deficiencies in the prior art, the utility model provides an inverter direct current side coupling energy storage system can save equipment such as photovoltaic inverter, step up/step down isolation transformer, when having promoted system efficiency, has reduced system cost by a wide margin.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides an inverter direct current side coupling energy storage system, includes photovoltaic inverter, a plurality of groups photovoltaic module, a plurality of DC converter and multiunit energy storage battery cluster, direct current collection flow box, auxiliary transformer, distribution system, photovoltaic inverter's one end is passed through the case and is become low pressure side bus connection electric wire netting, and the other end is connected respectively photovoltaic module with the DC converter, distribution system passes through auxiliary transformer connects the bus-bar is used for giving photovoltaic inverter the DC converter supplies power, and at least two sets of photovoltaic module is through same the direct current collection flow box is connected to photovoltaic inverter, every DC converter is connected with a set of energy storage battery cluster, and every group energy storage battery cluster includes at least one battery cluster.
As one embodiment, the pv inverter is a concentrated or distributed inverter, and all pv modules are connected to the same pv inverter at the same time.
In one embodiment, the pv inverters are string inverters, and each group or groups of the pv modules are respectively connected to one of the pv inverters.
As one embodiment, the DC side of the photovoltaic inverter is selected from 1000V and 1500V systems.
As one embodiment, the outlet voltage of the photovoltaic inverter is 800V.
The utility model discloses a direct current side coupling energy storage system is through inserting the electric wire netting through photovoltaic inverter direct current side, only need dispose the corresponding voltage level's of photovoltaic inverter direct current side direct current converter can, compare in alternating current side coupling energy storage system, direct current side coupling energy storage system can save the transformer, and overall efficiency obviously promotes, and to high volume ratio photovoltaic system, the reducible photovoltaic inverter configuration quantity of direct current side coupling energy storage system for the system cost has very big reduction.
Drawings
Fig. 1 is a schematic structural diagram of an inverter dc-side coupling energy storage system according to an embodiment of the present invention;
fig. 2 shows a schematic structural diagram of a subarray EMS system of an inverter dc-side coupled energy storage system according to an embodiment of the present invention;
fig. 3 shows a schematic diagram of a configuration method of a photovoltaic capacity ratio according to an embodiment of the present invention;
fig. 4 shows a schematic diagram of a configuration method of a photovoltaic energy storage capacity according to an embodiment of the present invention.
Detailed Description
In the present invention, the terms "disposed", "provided" and "connected" should be interpreted broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
The terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing and simplifying the description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meaning of these terms in the present invention can be understood by those of ordinary skill in the art as appropriate.
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, the embodiment of the utility model provides an inverter direct current side coupling energy storage system, including photovoltaic inverter 10, a plurality of groups photovoltaic module 20, a plurality of direct current converter 30 and multiunit energy storage battery cluster 40, direct current collection flow box 50, auxiliary transformer 60, distribution system 70, photovoltaic inverter 10's one end is passed through the case and is become low pressure side generating line L and connect electric wire netting M side, photovoltaic module 20 and direct current converter 30 are connected respectively to the other end, distribution system 70 passes through auxiliary transformer 60 and connects generating line L, be used for photovoltaic inverter 10, auxiliary assembly power supplies power such as direct current converter 30, and at least two sets of photovoltaic module 20 are connected to photovoltaic inverter 10 through same direct current collection flow box 50, every direct current converter 30 is connected with a set of energy storage battery cluster 40, every group energy storage battery cluster 40 includes at least one battery cluster 40.
The photovoltaic inverter 10 is preferably a concentrated or a distributed inverter, and in the present embodiment, all the photovoltaic modules 20 are connected to the same photovoltaic inverter 10 at the same time. In other embodiments, the photovoltaic inverters 10 may be string inverters, wherein each group or groups of photovoltaic modules 20 is connected to a respective one of the photovoltaic inverters 10.
Compared with an inverter alternating current side coupling energy storage system, the inverter direct current side coupling energy storage system is distributed, a power grid can be accessed through a centralized or distributed inverter direct current side, main equipment of the direct current side coupling energy storage system is configured to be an energy storage battery system and a direct current converter (DC/DC), transformers are reduced in the main equipment of the system, and the overall efficiency is obviously improved.
In this embodiment, the outlet voltage of the photovoltaic inverter 10 is 800V, which meets the requirement of the outlet voltage of the grid-connected photovoltaic inverter in the market, and has strong versatility. Because the centralized or distributed inverter direct-current side coupling energy storage system is connected to the power grid through the photovoltaic inverter direct-current side, generally, the photovoltaic inverter 10 direct-current side is selected from 1000V and 1500V systems, that is, the photovoltaic inverter direct-current side is divided into 1000V and 1500V systems, therefore, only the direct-current converter with the corresponding voltage class needs to be configured for standby actually, so as to adapt to different equipment requirements, and the system efficiency can be improved to a great extent.
It is understood that in other embodiments, the outlet voltage of the photovoltaic inverter 10 may be changed to other values according to needs, and the embodiment is not limited thereto.
In addition, for a high-capacity ratio sub-matrix (the capacity ratio is more than or equal to 1.4), if the number of the photovoltaic inverter interfaces is not satisfied, the requirement can be satisfied by properly increasing the number of the direct current combiner boxes connected into the photovoltaic module, and a step-up/step-down isolation transformer is not required to be configured.
As shown in fig. 2, the Energy management system (Energy management system) of the present embodiment includes a station-controlled AGC/AVC (Automatic Generation Control/Automatic Voltage Control) host 1, a fast frequency modulation device 2 (e.g. PCS9726), a station-controlled EMS3, an optical fiber ring network switch 4 at the monitoring system bay of a photovoltaic power station, a sub-array EMS5, a photovoltaic inverter 10, a dc combiner box 50, an in-situ monitoring device (EMU)6, and a power management system (BMS)7, wherein the station-controlled EMS3 receives command Control issued by the station-controlled AGC/AVC host 1 and the fast frequency modulation device 2, and provides power to the sub-array EMS5 through the lower part of the optical fiber ring network switch 4, and the sub-array EMS5 further coordinates the photovoltaic inverter 10, the dc combiner box 50, and the in-situ monitoring device (EMU)6 to Control power consumption of each load 8 by photovoltaic power Generation, an in-situ monitoring unit (EMU)6 is used to control the charging and discharging process of each energy storage battery cluster 40 through the power management system 7. The local monitoring Equipment (EMU)6 can also be connected with an energy storage watt-hour meter 7a, and the residual capacity of each energy storage battery cluster 40 can be monitored in real time through the reading of the energy storage watt-hour meter 7 a.
Specifically, the sub-square EMS5 includes a data collection device 51, the data collection device 51 is connected to the fiber ring network switch 4, the photovoltaic inverter 10, the dc combiner box 50, and the in-situ monitoring device 6 at the same time, and the parameters of the photovoltaic inverter 10, the dc combiner box 50, and the in-situ monitoring device 6 are regulated and controlled according to the instruction received from the connected fiber ring network switch 4, so as to balance the power consumption requirements of various loads 8. The sub-square-matrix EMS system can be provided with a box transformer substation watt-hour meter M1 and a box transformer substation measurement and control device M2 which are connected with the data acquisition device 51, and the box transformer substation grid-connected point power can be obtained according to the measurement results of the box transformer substation watt-hour meter M1 and the box transformer substation measurement and control device M2.
As shown in fig. 3, the embodiment of the present invention further provides a photovoltaic capacity matching configuration method, including:
s01, acquiring the nominal capacity Q of the energy storage system;
s02, according to the nominal capacity Q of the energy storage system and the step-by-step efficiency k of the discharge process of the energy storage system2Determining an energy storage configuration capacity Q2；
S03, configuring the capacity Q according to the energy storage2Step-by-step efficiency k of charging process of energy storage system1Determining photovoltaic discard light quantity Q0；
S04, discarding the light quantity Q according to the photovoltaic0And determining the photovoltaic capacity ratio r.
Wherein, the step-by-step efficiency k of the charging process of the energy storage system1Step-by-step efficiency k of discharge process of energy storage system2And determining the transmission efficiency according to the transmission efficiency of the direct current converter, the energy storage battery system and the cable.
As shown in fig. 4, the embodiment of the present invention further provides a photovoltaic energy storage capacity configuration method, including:
s001, obtaining photovoltaic light abandoning electric quantity Q according to configuration of a photovoltaic system0；
S002, discarding the light quantity Q according to the photovoltaic0Determining the chargeable quantity of energy storage Q1；
S003, charging quantity Q according to stored energy1Step-by-step efficiency k of charging process of energy storage system1Determining an energy storage configuration capacity Q2；
S004, configuring the capacity Q according to the stored energy2Step-by-step efficiency k of discharge process of energy storage system2And determining the nominal capacity Q of the energy storage system.
Likewise, the step-by-step efficiency k of the charging process of the energy storage system1Step-by-step efficiency k of discharge process of energy storage system2The method is also determined according to the transmission efficiency of the direct current converter, the energy storage battery system and the cable.
To sum up, the utility model discloses a direct current side coupling energy storage system is through inserting the electric wire netting through photovoltaic inverter direct current side, only need dispose the corresponding voltage level's of photovoltaic inverter direct current side direct current converter can, compare in exchange side coupling energy storage system, direct current side coupling energy storage system can save the transformer, and overall efficiency obviously promotes, and to high appearance ratio photovoltaic system, the reducible photovoltaic inverter configuration quantity of direct current side coupling energy storage system for system's cost has very big reduction.
The foregoing is directed to embodiments of the present application and it is noted that numerous modifications and adaptations may be made by those skilled in the art without departing from the principles of the present application and are intended to be within the scope of the present application.
Claims (5)
1. An inverter direct-current side coupling energy storage system is characterized by comprising a photovoltaic inverter (10), a plurality of groups of photovoltaic assemblies (20), a plurality of direct-current converters (30), a plurality of groups of energy storage battery clusters (40), a direct-current junction box (50), an auxiliary transformer (60) and a power distribution system (70), wherein one end of the photovoltaic inverter (10) is connected with a power grid through a box transformer low-voltage side bus (L), the other end of the photovoltaic inverter is respectively connected with the photovoltaic assemblies (20) and the direct-current converters (30), the power distribution system (70) is connected with the bus (L) through the auxiliary transformer (60) and is used for supplying power to the photovoltaic inverter (10) and the direct-current converters (30), at least two groups of photovoltaic assemblies (20) are connected to the photovoltaic inverter (10) through the same direct-current junction box (50), and each direct-current converter (30) is connected with one group of energy storage battery clusters (40), each set of energy storage cell clusters (40) comprises at least one cell cluster (40).
2. The inverter dc-side coupled energy storage system according to claim 1, wherein the photovoltaic inverter (10) is a concentrated or distributed inverter, all photovoltaic modules (20) being connected to the same photovoltaic inverter (10) at the same time.
3. The inverter dc-side coupled energy storage system according to claim 1, wherein the photovoltaic inverters (10) are string inverters, and one photovoltaic inverter (10) is connected to each one or more groups of the photovoltaic modules (20).
4. The inverter direct-current side coupling energy storage system according to any one of claims 1 to 3, wherein the direct-current side of the photovoltaic inverter (10) is selected from 1000V and 1500V systems.
5. The inverter direct-current side-coupled energy storage system according to any one of claims 1 to 3, wherein the outlet voltage of the photovoltaic inverter (10) is 800V.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122869458.9U CN216436820U (en) | 2021-11-22 | 2021-11-22 | Inverter direct-current side coupling energy storage system |
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| CN202122869458.9U CN216436820U (en) | 2021-11-22 | 2021-11-22 | Inverter direct-current side coupling energy storage system |
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