CN217522595U - Light storage charging micro-grid structure and light storage micro-grid topological structure - Google Patents
Light storage charging micro-grid structure and light storage micro-grid topological structure Download PDFInfo
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- CN217522595U CN217522595U CN202221345023.2U CN202221345023U CN217522595U CN 217522595 U CN217522595 U CN 217522595U CN 202221345023 U CN202221345023 U CN 202221345023U CN 217522595 U CN217522595 U CN 217522595U
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Abstract
The utility model belongs to the technical field of power electronics, concretely relates to light stores up and fills microgrid structure and light stores up microgrid topological structure. The photovoltaic energy storage and charging micro-grid topology is characterized in that alternating current and direct current are distinguished by using an electric load, the direct current load directly obtains direct current from a direct current bus, an alternating current load obtains alternating current from an alternating current bus, and meanwhile, direct current contactors are connected in series between direct current bus access points of the direct current loads or power supplies to control the direct current bus access points, so that the direct current loads and the power supplies can run together with the direct current bus or independently of the direct current bus.
Description
Technical Field
The utility model belongs to the technical field of power electronics, concretely relates to light stores up and fills microgrid structure and light stores up microgrid topological structure.
Background
In recent years, small green energy construction projects and products represented by wind, light and storage are rapidly developed. The scheme and the product of the medium and small-sized micro-grid combined by photovoltaic and energy storage are particularly good, the photovoltaic is matched with the energy storage to solve the problems of unstable short plates of photovoltaic power generation and the consumption of the short plates, and the medium and small-sized micro-grid combined photovoltaic and energy storage can be operated in a grid-connected mode and can also be operated independently.
Two mature microgrid product schemes popular in the existing industry are provided, one scheme is a common alternating current bus scheme, photovoltaic and energy storage are respectively connected to a power grid common point after independent DC-AC conversion (power is fully distributed respectively), and the defects of low efficiency and high cost are overcome; the other scheme is a common direct current bus scheme, the photovoltaic and the stored energy are converged after independent DC-DC conversion respectively, and then are connected to a power grid after being subjected to DC-AC conversion all together, and the defects that the direct current bus voltage needs to be forced to be unified, and the application limitation is large.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a light stores up and fills little grid structure and light stores up little grid topology to in solving current microgrid product, the problem that inefficiency, with high costs, application limitation are big.
In order to achieve the above purpose, the utility model provides a technical scheme as follows:
a light storage and charging micro-grid structure comprises a direct-current load, a direct-current contactor KZ1, a direct-current contactor KZ12, a direct-current contactor KZ13, a charging module, an energy storage battery, a photovoltaic group string, a unidirectional DC-DC power conversion module and a bidirectional DC-AC power conversion module;
the direct-current load is connected with one end of a direct-current contactor KZ1, the other end of a direct-current contactor KZ1 is connected with a node B, the photovoltaic string is connected with one end of a direct-current contactor KZ12 through a one-way DC-DC power conversion module, the other end of the direct-current contactor KZ12 is connected with the node B, the energy storage battery is connected with one end of the direct-current contactor KZ13, and the other end of the direct-current contactor KZ13 is connected with the node B;
one end of the charging module is connected with the node B, the other end of the charging module is connected with the node A, one end of the bidirectional DC-AC power conversion module is connected with the node B, and the other end of the bidirectional DC-AC power conversion module is connected with the node A;
node a is a point on the ac bus and node B is a point on the dc bus.
Preferably, the unidirectional DC-DC power conversion module has a maximum power point tracking function.
The optical storage micro-grid topological structure is a minimum composition unit of the optical storage micro-grid topological structure, and the optical storage micro-grid topological structure comprises n minimum composition units; n is an even number greater than or equal to 2;
on the ith minimum component unit, all components are marked as a direct current load i, a direct current contactor KZi2, a direct current contactor KZi3, a charging module i, an energy storage battery i, a photovoltaic group string i, a unidirectional DC-DC power conversion module i and a bidirectional DC-AC power conversion module i;
the direct current load i is connected with one end of a direct current contactor KZi, the other end of the direct current contactor KZi is connected with a node Bi, the photovoltaic group string i is connected with one end of the direct current contactor KZi2 through a unidirectional DC-DC power conversion module i, the other end of the direct current contactor KZi2 is connected with the node Bi, the energy storage battery i is connected with one end of the direct current contactor KZi3, and the other end of the direct current contactor KZi3 is connected with the node Bi;
one end of the charging module i is connected with the node Bi, the other end of the charging module i is connected with the node Ai, one end of the bidirectional DC-AC power conversion module i is connected with the node Bi, and the other end of the bidirectional DC-AC power conversion module i is connected with the node Ai;
at the moment, Ai nodes of all the minimum composition units are connected to form an alternating current bus.
Preferably, when i is 1, Bi and Bn are connected through a dc contactor.
Preferably, when 1 < i < n, Bi and Bi +1 are connected through a direct current contactor, and Bi-1 are connected through a direct current contactor.
Preferably, when i is more than or equal to 1 and less than or equal to n/2, Bi and Bn/2+ i are connected through a direct current contactor.
A light storage micro-grid topological structure is characterized in that the light storage micro-grid topological structure is the minimum composition unit of the light storage micro-grid topological structure; the optical storage micro-grid topological structure comprises n +1 minimum composition units; n is an even number greater than or equal to 2;
on the ith minimum component unit, all components are marked as a direct current load i, a direct current contactor KZi2, a direct current contactor KZi3, a charging module i, an energy storage battery i, a photovoltaic group string i, a unidirectional DC-DC power conversion module i and a bidirectional DC-AC power conversion module i;
the direct current load i is connected with one end of a direct current contactor KZi, the other end of the direct current contactor KZi is connected with a node Bi, the photovoltaic group string i is connected with one end of the direct current contactor KZi2 through a one-way DC-DC power conversion module i, the other end of the direct current contactor KZi2 is connected with the node Bi, the energy storage battery i is connected with one end of the direct current contactor KZi3, and the other end of the direct current contactor KZi3 is connected with the node Bi;
one end of the charging module i is connected with the node Bi, the other end of the charging module i is connected with the node Ai, one end of the bidirectional DC-AC power conversion module i is connected with the node Bi, and the other end of the bidirectional DC-AC power conversion module i is connected with the node Ai;
and the Ai nodes of the minimum composition units are connected to form an alternating current bus.
Preferably, when i is 1, Bi and Bn +1 are connected through a dc contactor.
Preferably, when 1 < i < n +1, Bi and Bi +1 are connected through a direct current contactor, and Bi-1 are connected through a direct current contactor.
Preferably, 2+ i is connected via a dc contactor.
The utility model discloses an useful part lies in:
the alternating current and direct current are distinguished for the power loads, the direct current loads directly obtain direct current from the direct current bus, the alternating current loads obtain alternating current from the alternating current bus, and the direct current bus is segmented, so that the direct current loads and the power supply can run together with the direct current bus and can also run independently of the direct current bus, and compared with a common direct current bus mode of a traditional micro-grid framework, the method is more flexible and efficient.
The photovoltaic instability and the application mode of the energy storage lithium battery are comprehensively considered in the aspect of using the power change module of the light storage micro-grid topological structure composed of the minimum composition units, the idea that the photovoltaic and energy storage 'shared' conversion modules and the modules in different groups can be mutually borrowed is adopted, compared with the traditional scheme that the micro-grid topological power conversion module is respectively fully matched and the use loop is single, the cost advantage is better, the modules can be fully utilized, and the resource waste is avoided.
Drawings
The accompanying drawings, which form a part of the specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without unduly limiting the scope of the invention. In the drawings:
fig. 1 is a schematic diagram of a light storage and charging microgrid structure;
fig. 2 is a light storage and charging microgrid topology comprised of a light storage and charging microgrid structure.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments. It should be noted that, in the case of no conflict, the embodiments and features of the embodiments of the present invention may be combined with each other.
The following detailed description is exemplary in nature and is intended to provide further details of the invention. Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the invention.
Example 1:
as shown in fig. 1, a light storage and charging microgrid structure comprises a direct-current load, a direct-current contactor KZ2, a direct-current contactor KZ3, a charging module, an energy storage battery, a photovoltaic string, a unidirectional DC-DC power conversion module, and a bidirectional DC-AC power conversion module;
the direct-current load 1 is connected with one end of a direct-current contactor KZ1, the other end of the direct-current contactor KZ is connected with a node B, a photovoltaic group string is connected with one end of a direct-current contactor KZ2 through a one-way DC-DC power conversion module, the other end of the direct-current contactor KZ2 is connected with the node B, an energy storage battery is connected with one end of a direct-current contactor KZ3, and the other end of the direct-current contactor KZ3 is connected with the node B;
the charging module is used as an alternating current load, one end of the charging module is connected with the node B, the other end of the charging module is connected with the node A, one end of the bidirectional DC-AC power conversion module is connected with the node B, and the other end of the bidirectional DC-AC power conversion module is connected with the node A.
Node a is a point on the ac bus and node B is a point on the dc bus.
The energy storage battery can be connected to the direct current bus after passing through the direct current contactor KZ3 without the need of primary DC-DC conversion; the energy storage battery is connected to the alternating current bus through the bidirectional DC-AC power conversion module and the charging module; when the energy storage battery is charged, the bidirectional DC-AC power conversion module can be charged, and the bidirectional DC-AC power conversion module can also be charged; and when the energy storage battery is discharged, the bidirectional DC-AC power conversion module is used for charging and discharging to the power grid.
The direct current load is connected to the direct current bus through the KZ, electricity can be directly obtained from the direct current bus, electricity can also be obtained from the alternating current bus through the charging module to charge the automobile, and when other charging modules or other unidirectional DC-DC are idle, the direct current load can be charged by other charging modules and the unidirectional DC-DC according to the actual power requirement of the current direct current load.
After passing through the unidirectional DC-DC power conversion module, the photovoltaic group is connected with a direct current bus KZ2 and can supply power to all energy storage batteries and direct current loads hung on the direct current bus; the alternating current bus can also be accessed through the bidirectional DC-AC power conversion module, and the inversion discharge is carried out to the power grid.
The unidirectional DC-DC power conversion module has an MPPT function.
Example 2:
the optical storage and charging microgrid structure in embodiment 1 is used as a minimum composition unit to establish an optical storage and charging microgrid topology.
Setting the current as the ith minimum composition unit, wherein i is more than or equal to 1 and less than or equal to n;
on the ith minimum component unit, all components are marked as a direct current load i, a direct current contactor KZi2, a direct current contactor KZi3, a charging module i, an energy storage battery i, a photovoltaic group string i, a unidirectional DC-DC power conversion module i and a bidirectional DC-AC power conversion module i;
the direct current load i is connected with one end of a direct current contactor KZi, the other end of the direct current contactor KZi is connected with a node Bi, the photovoltaic group string i is connected with one end of the direct current contactor KZi2 through a unidirectional DC-DC power conversion module i, the other end of the direct current contactor KZi2 is connected with the node Bi, the energy storage battery i is connected with one end of the direct current contactor KZi3, and the other end of the direct current contactor KZi3 is connected with the node Bi;
one end of the charging module i is connected with the node Bi, the other end of the charging module i is connected with the node Ai, one end of the bidirectional DC-AC power conversion module i is connected with the node Bi, and the other end of the bidirectional DC-AC power conversion module i is connected with the node Ai.
At the moment, Ai nodes of all the minimum composition units are connected to form an alternating current bus.
n is an even number, n is greater than or equal to 2, and when n minimum composition units exist in the optical storage and charging micro-grid topology, then: when i is 1, Bi is connected with Bn through a direct current contactor, when i is more than 1 and less than n, Bi is connected with Bi +1 through the direct current contactor, and Bi is connected with Bi-1 through the direct current contactor;
and when i is more than or equal to 1 and less than or equal to n/2, Bi is connected with B n/2+ i through a direct current contactor.
n is an even number, n is greater than or equal to 2, and when n +1 minimum composition units exist in the optical storage and charging micro-grid topology, then: when i is equal to 1, Bi is connected with Bn +1 through a direct current contactor, when i is more than 1 and less than n +1, Bi is connected with Bi +1 through the direct current contactor, and Bi is connected with Bi-1 through the direct current contactor;
and when i is more than or equal to 1 and less than or equal to n/2, Bi is connected with B n/2+ i through a direct current contactor.
Fig. 2 is a schematic diagram of a topology of a light storage and charging microgrid when n is 6.
In the figure, the voltage range of the energy storage battery is designed in the constant power output range of the bidirectional DC-AC power conversion module 1 and the charging module 1, and the energy storage battery 1 can be connected to a direct current bus after passing through a direct current contactor KZ13 without the need of primary DC-DC conversion; the energy storage battery 1 is connected to an alternating current bus through the bidirectional DC-AC power conversion module 1 and the charging module 1; when the energy storage battery 1 is charged, the bidirectional DC-AC power conversion module 1 can be charged, and the charging module 1 can also be used for charging; when the battery is discharged, the battery is charged and discharged to the power grid through the DC-AC 1.
When the direct-current load 1 is connected to a direct-current bus through KZ1, electricity can be directly taken from the direct-current bus; and electricity can be obtained from the alternating current bus through the charging module 1. When other charging modules or other unidirectional DC-DC power conversion modules are idle, the other charging modules and other unidirectional DC-DC power conversion modules can be used for supplying power to the DC load according to the actual power requirement of the current DC load.
The photovoltaic group string 1 is connected to a direct current bus through a unidirectional DC-DC conversion module 1 and a direct current contactor KZ12, and can supply power to all energy storage lithium batteries and electric vehicles hung on the direct current bus; the alternating current bus can also be accessed through the bidirectional DC-AC power conversion module 1 or other idle bidirectional DC-AC power conversion modules, and the inversion is discharged to the power grid.
Among all the constituent units in the topology, the bidirectional DC-AC power conversion module, the photovoltaic module and the energy storage charging module can be flexibly matched according to the supply and demand of the microgrid system.
It will be appreciated by those skilled in the art that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The embodiments disclosed above are therefore to be considered in all respects as illustrative and not restrictive. All changes which come within the scope of the invention or which are equivalent to the scope of the invention are embraced by the invention.
Claims (10)
1. A light storage and charging micro-grid structure is characterized by comprising a direct current load, a direct current contactor KZ1, a direct current contactor KZ12, a direct current contactor KZ13, a charging module, an energy storage battery, a photovoltaic string, a unidirectional DC-DC power conversion module and a bidirectional DC-AC power conversion module;
the direct-current load is connected with one end of a direct-current contactor KZ1, the other end of a direct-current contactor KZ1 is connected with a node B, the photovoltaic string is connected with one end of a direct-current contactor KZ12 through a one-way DC-DC power conversion module, the other end of the direct-current contactor KZ12 is connected with the node B, the energy storage battery is connected with one end of the direct-current contactor KZ13, and the other end of the direct-current contactor KZ13 is connected with the node B;
one end of the charging module is connected with the node B, the other end of the charging module is connected with the node A, one end of the bidirectional DC-AC power conversion module is connected with the node B, and the other end of the bidirectional DC-AC power conversion module is connected with the node A;
node a is a point on the ac bus and node B is a point on the dc bus.
2. The light storage and charging microgrid structure of claim 1, wherein the unidirectional DC-DC power conversion module has a maximum power point tracking function.
3. An optical storage microgrid topology structure based on the optical storage microgrid structure of claim 1, characterized in that the optical storage microgrid topology structure is a minimum composition unit of the optical storage microgrid topology structure, and the optical storage microgrid topology structure comprises n minimum composition units; n is an even number greater than or equal to 2;
on the ith minimum component unit, all components are marked as a direct current load i, a direct current contactor KZi2, a direct current contactor KZi3, a charging module i, an energy storage battery i, a photovoltaic module string i, a unidirectional DC-DC power conversion module i and a bidirectional DC-AC power conversion module i;
the direct current load i is connected with one end of a direct current contactor KZi, the other end of the direct current contactor KZi is connected with a node Bi, the photovoltaic group string i is connected with one end of the direct current contactor KZi2 through a unidirectional DC-DC power conversion module i, the other end of the direct current contactor KZi2 is connected with the node Bi, the energy storage battery i is connected with one end of the direct current contactor KZi3, and the other end of the direct current contactor KZi3 is connected with the node Bi;
one end of the charging module i is connected with the node Bi, the other end of the charging module i is connected with the node Ai, one end of the bidirectional DC-AC power conversion module i is connected with the node Bi, and the other end of the bidirectional DC-AC power conversion module i is connected with the node Ai;
at the moment, Ai nodes of all the minimum composition units are connected to form an alternating current bus.
4. The optical storage microgrid topology of claim 3, wherein when i is 1, Bi and Bn are connected through a direct current contactor.
5. The optical storage microgrid topology structure of claim 4, wherein when 1 < i < n, Bi and Bi +1 are connected through a direct current contactor, and Bi-1 are connected through a direct current contactor.
6. The optical storage microgrid topology structure of claim 5, wherein when i is more than or equal to 1 and less than or equal to n/2, Bi and Bn/2+ i are connected through a direct current contactor.
7. An optical storage microgrid topology structure based on the optical storage microgrid structure of claim 1, wherein the optical storage microgrid structure is a minimum composition unit of the optical storage microgrid topology structure; the optical storage micro-grid topological structure comprises n +1 minimum composition units; n is an even number greater than or equal to 2;
on the ith minimum component unit, all components are marked as a direct current load i, a direct current contactor KZi2, a direct current contactor KZi3, a charging module i, an energy storage battery i, a photovoltaic group string i, a unidirectional DC-DC power conversion module i and a bidirectional DC-AC power conversion module i;
the direct current load i is connected with one end of a direct current contactor KZi, the other end of the direct current contactor KZi is connected with a node Bi, the photovoltaic group string i is connected with one end of the direct current contactor KZi2 through a unidirectional DC-DC power conversion module i, the other end of the direct current contactor KZi2 is connected with the node Bi, the energy storage battery i is connected with one end of the direct current contactor KZi3, and the other end of the direct current contactor KZi3 is connected with the node Bi;
one end of the charging module i is connected with the node Bi, the other end of the charging module i is connected with the node Ai, one end of the bidirectional DC-AC power conversion module i is connected with the node Bi, and the other end of the bidirectional DC-AC power conversion module i is connected with the node Ai;
and the Ai nodes of the minimum composition units are connected to form an alternating current bus.
8. The optical storage microgrid topology of claim 7, wherein when i is 1, Bi and Bn +1 are connected through a direct current contactor.
9. The optical storage microgrid topology structure of claim 8, wherein when 1 < i < n +1, Bi and Bi +1 are connected through a direct current contactor, and Bi-1 are connected through a direct current contactor.
10. The optical storage microgrid topology structure of claim 9, wherein when i is more than or equal to 1 and less than or equal to n/2, Bi and B n/2+ i are connected through a direct current contactor.
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