CN210429001U

CN210429001U - Distributed photovoltaic grid-connected practical training device

Info

Publication number: CN210429001U
Application number: CN201920942289.7U
Authority: CN
Inventors: 曹有为; 聂永刚; 刘海涛; 李俊青; 侯瑞; 韩爽; 张璐; 魏炜
Original assignee: Inner Mongolia Power Group Synthesis Energy Co ltd; Training Center Inner Mongolia Power Group Co ltd
Current assignee: Inner Mongolia Power Group Synthesis Energy Co ltd; Training Center Inner Mongolia Power Group Co ltd
Priority date: 2019-06-21
Filing date: 2019-06-21
Publication date: 2020-04-28
Anticipated expiration: 2029-06-21

Abstract

The utility model provides a real device of instructing of distributing type photovoltaic grid-connected, include: an internal circuit; an internal circuit comprising: the device comprises a direct-current power supply, an inverter unit, a breaker unit, a load branch and an output branch; the practical training personnel can control whether each connecting wire is connected to each corresponding port in the internal circuit through practical training operation, so that theoretical guidance in the prior art is replaced, the practical training personnel can operate personally and master typical access schemes of various distributed photovoltaic access distribution networks, and the practical training personnel are more familiar with grid-connected schemes of distributed photovoltaic.

Description

Distributed photovoltaic grid-connected practical training device

Technical Field

The utility model relates to a power electronic technology field especially relates to a real device of instructing of distributing type photovoltaic grid-connected.

Background

The distributed photovoltaic is a photovoltaic power generation facility which is built near a user site, has an operation mode of self-generation and self-use at a user side, is on line with redundant electric quantity and is characterized by balance adjustment in a power distribution system. At present, distributed photovoltaic power generation is greatly popularized in China, the key point is to select an industrial park with high online purchase price, relatively less subsidies, more power consumption and stable load to popularize in an economically developed area, and a photovoltaic application demonstration is developed according to the principle of 'spontaneous self-use and local consumption'.

However, with the annual increase of distributed photovoltaic power generation, the service volume of services such as power grid access and the like related to the distributed photovoltaic power generation is also increased continuously, and due to the fact that technical training of power grid service personnel is insufficient, when the service personnel transact the services, only theoretical knowledge and processes corresponding to hard sleeves can be moved, the transaction process of the related services is not smooth, and even the phenomenon of contradiction between the business personnel and clients often occurs. Meanwhile, the distributed photovoltaic is accessed into the power grid in various forms, and due to the fact that service personnel do not have practical operation experience, blind points exist in examination and supervision of the distributed photovoltaic grid connection, risks are brought to safe and stable operation of the power distribution network, and distribution network fault power failure and even personal injury can be caused in severe cases.

SUMMERY OF THE UTILITY MODEL

In view of this, the embodiment of the utility model provides a real device of instructing that is incorporated into power networks to when the electric wire netting company carries out relevant technical skill training to the service personnel, can develop the real object operation training to the grid-connected of distributed photovoltaic, reduce the blind spot that the service personnel examined and supervise the grid-connected of distributed photovoltaic.

In order to achieve the above object, the embodiment of the present invention provides the following technical solutions:

a real device of instructing that distributes type photovoltaic is incorporated into power networks includes: an internal circuit; the internal circuit includes: the device comprises a direct-current power supply, an inverter unit, a breaker unit, a load branch and an output branch; wherein:

the output end of the direct current power supply is electrically connected with the direct current side of the inverter unit through a connecting wire;

the alternating current side of the inverter unit is electrically connected with the input end of the circuit breaker unit through a connecting wire;

the output end of the circuit breaker unit is electrically connected with the bus through a connecting wire;

the power end of the load branch circuit is electrically connected with the bus through a connecting wire;

the input end of the output branch circuit is electrically connected with the bus through a connecting wire;

whether the corresponding connecting line is connected or not is controlled by the operation of practical training personnel.

Optionally, the bus bar includes: single-phase bus and three-phase bus.

Optionally, the circuit breaker unit includes: a single-phase circuit breaker unit and a three-phase circuit breaker unit; wherein:

the input end of the single-phase circuit breaker unit is used as the single-phase input end of the circuit breaker unit;

the output end of the single-phase circuit breaker unit is electrically connected with the single-phase bus through a connecting wire;

the input end of the three-phase circuit breaker unit is used as the three-phase input end of the circuit breaker unit;

and the output end of the three-phase circuit breaker unit is electrically connected with the three-phase bus through a connecting wire.

Optionally, the inverter unit includes: the system comprises a single-phase inverter, a first single-phase circuit breaker, a second single-phase circuit breaker and a three-phase inverter; wherein:

the direct-current side of the three-phase inverter is electrically connected with the direct-current side of the single-phase inverter through the first single-phase circuit breaker and the second single-phase circuit breaker in sequence, and a connection point is used as the direct-current side of the inverter unit; whether the corresponding connecting line is connected or not is controlled and operated by the practical training personnel;

the alternating current side of the single-phase inverter is used as the single-phase cross current side of the inverter unit;

the ac side of the three-phase inverter is the three-phase ac side of the inverter unit.

Optionally, the load branch includes: a single-phase load branch and a three-phase load branch; wherein:

the power supply end of the single-phase load branch circuit is electrically connected with the single-phase bus through a connecting wire;

and the power end of the three-phase load branch circuit is electrically connected with the three-phase bus through a connecting wire.

Optionally, the single-phase load branch includes: a first single-phase alternating current load, a second single-phase alternating current load, and a third single-phase circuit breaker; the three-phase load branch comprises: a first three-phase alternating current load, a second three-phase alternating current load and a first three-phase circuit breaker; wherein:

the power supply end of the first single-phase alternating current load is electrically connected with the output end of the third single-phase circuit breaker through a connecting wire;

the power supply end of the second single-phase alternating current load is electrically connected with the output end of the third single-phase circuit breaker through a connecting wire;

the input end of the third single-phase circuit breaker is used as a power supply end of the single-phase load branch circuit;

the power supply end of the first three-phase alternating current load is electrically connected with the output end of the first three-phase circuit breaker through a connecting wire;

the power supply end of the second three-phase alternating current load is electrically connected with the output end of the first three-phase circuit breaker through a connecting wire;

the input end of the first three-phase circuit breaker is used as a power supply end of the three-phase load branch circuit;

Optionally, the output branch includes: the single-phase output branch circuit and the three-phase output branch circuit; wherein:

the input end of the single-phase output branch circuit is electrically connected with the single-phase bus through a connecting wire;

the output end of the single-phase output branch circuit is used as the single-phase output end of the output branch circuit;

the input end of the three-phase output branch circuit is electrically connected with the three-phase bus through a connecting wire;

and the output end of the three-phase output branch circuit is used as the three-phase output end of the output branch circuit.

Optionally, the single-phase output branch includes: the system comprises a first alternating current contactor and a first metering module; the three-phase output branch comprises: a second ac contactor and a second metering module; wherein:

the input end of the first alternating current contactor is used as the input end of the single-phase output branch circuit, and the output end of the first alternating current contactor is used as the output end of the single-phase output branch circuit;

the detection end of the first metering module is arranged at the output end of the first alternating current contactor;

the input end of the second alternating current contactor is used as the input end of the three-phase output branch circuit, and the output end of the second alternating current contactor is used as the output end of the three-phase output branch circuit;

and the detection end of the second metering module is arranged at the output end of the second alternating current contactor.

Optionally, the single-phase circuit breaker unit includes: a fourth single-phase circuit breaker and a fifth single-phase circuit breaker; the three-phase circuit breaker unit includes: a second three-phase circuit breaker and a third three-phase circuit breaker; wherein:

the input end of the fourth single-phase circuit breaker is electrically connected with the input end of the fifth single-phase circuit breaker through a connecting wire, and a connecting point is used as the input end of the single-phase circuit breaker unit;

the output end of the fourth single-phase circuit breaker is used as a first output end of the single-phase circuit breaker unit;

the output end of the fifth single-phase circuit breaker is used as a second output end of the single-phase circuit breaker unit;

the input end of the second three-phase circuit breaker is electrically connected with the input end of the third three-phase circuit breaker through a connecting wire, and a connecting point is used as the input end of the three-phase circuit breaker unit;

the output end of the second three-phase circuit breaker is used as the first output end of the three-phase circuit breaker unit;

the output end of the third three-phase circuit breaker is used as a second output end of the three-phase circuit breaker unit;

whether the corresponding connecting line is connected or not is controlled and operated by the practical training personnel.

Optionally, the internal circuit further includes: a plurality of metering modules; wherein:

and the detection end of each metering module is respectively arranged at the output end of each circuit breaker in the circuit breaker unit.

Optionally, the method further includes: a housing; wherein:

the internal circuit is arranged inside the shell;

the front panel outside the shell is marked with a circuit schematic diagram of the internal circuit;

and corresponding ports of the internal circuit, which are connected with the connecting wires, are arranged at corresponding positions in the circuit schematic diagram in a plug-in connector mode.

Optionally, the internal circuit further includes: the detection end of each metering module is respectively arranged at the output end of each circuit breaker in the circuit breaker unit;

the shell is characterized in that a plurality of metering display panels are further arranged on the front panel outside the shell, and the input ends of the metering display panels are respectively connected with the output ends of the metering modules in a one-to-one correspondence mode.

Compared with the prior art, the utility model provides a real device of instructing of distributing type photovoltaic grid-connected, including the internal circuit, and the internal circuit includes DC power supply, inverter unit, circuit breaker unit, load branch road and output branch road, and wherein each unit, or the device, or the connection between the branch road is the electrical connection who realizes through the connecting wire, so instruct personnel whether to insert through each connecting wire of control operation in fact, realize the real standard of operation to the various typical schemes of connecting to the grid of distributing type photovoltaic, and then reduce the blind spot to the distributed photovoltaic grid-connected inspection and supervision.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is a schematic diagram of an internal circuit in a distributed photovoltaic grid-connected practical training device provided by an embodiment of the present invention;

FIGS. 2a and 2a are schematic diagrams of an embodiment of an internal circuit according to another embodiment of the present invention;

fig. 3a, 3b, 3c and 3d are circuit diagrams of four grid-connection schemes of distributed photovoltaic;

fig. 4a and fig. 4b are schematic diagrams of a front panel of a distributed photovoltaic grid-connected practical training device according to another embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description.

In this application, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

In order to can carry out relevant training to the business personnel when the electric wire netting company, can develop the real object operation training to the distributing type photovoltaic is incorporated into the power networks, reduce the blind spot that the business personnel examined and supervise the distributing type photovoltaic is incorporated into the power networks, the utility model provides a real device of instructing is incorporated into the power networks to distributing type photovoltaic, its specific structure is like figure 1, include: an internal circuit 10; the specific structure of the internal circuit 10 is shown in fig. 1, and includes: a dc power source 110, an inverter unit 120, a breaker unit 130, a load branch 140 and an output branch 150.

The output terminal of the dc power supply 110 is electrically connected to the dc side of the inverter unit 120 via a connection line.

It should be noted that the utility model discloses a DC power supply 110 simulates the output of distributed photovoltaic, and real device of instructing provides the electric energy for the grid-connected to the distributed photovoltaic.

Optionally, the dc power supply 110 may be a 5kW photovoltaic module or a photovoltaic analog power supply with equal power, or a dc power supply device, which is not specifically limited herein; in the embodiment, a 5kW photovoltaic analog power supply is selected, and specific parameters can be seen in table 1.

TABLE 1

The ac side of the inverter unit 120 is electrically connected to the input terminal of the circuit breaker unit 130 via a connection line; the output end of the breaker unit 130 is electrically connected to the bus bar through a connection line.

Specifically, the dc power supply 110 provides dc power to enter the inverter unit 120 through the dc side of the inverter unit 120, converts the dc power into ac power, and outputs the ac power through the ac side of the inverter unit 120; thereafter, the ac power is supplied to the bus bar through the breaker unit 130.

The power supply end of the load branch 140 is electrically connected with the bus through a connecting line, and is used for getting power from the bus and meeting the working requirement of the load branch.

The input end of the output branch 150 is electrically connected with the bus through a connecting wire.

Whether the connecting lines are connected or not can be controlled and operated by practical training personnel, and then a test platform for carrying out in-person operation on typical access schemes of various distributed photovoltaic access distribution networks is provided for the practical training personnel, so that the practical training personnel are more familiar with the grid-connected scheme of the distributed photovoltaic.

Compared with the prior art, the utility model provides a real device of instructing of distributed photovoltaic grid-connected, its internal circuit includes DC power supply, inverter unit, circuit breaker unit, load branch road and output branch road, and wherein, real personnel of instructing can be through real standard operation, whether control each connecting wire inserts corresponding port, and then replace the theoretical guidance among the prior art, make real personnel of instructing can operate in person and skilled master various distributed photovoltaic and insert the typical access scheme of joining in marriage the net.

Because some of the installed power of distributed photovoltaic are bigger, and some are smaller, so when installed power is great, because of the safety consideration, generally adopt the transmission of three-phase connection, and when installed power is less, can adopt single-phase connection transmission, therefore, the utility model discloses another example provides a concrete implementation scheme of real device of instructing of distributed photovoltaic grid-connected, on the basis of last embodiment, preferably, its generating line includes single-phase generating line and three-phase generating line, the concrete structure of an embodiment of circuit breaker unit 130, as fig. 2a and fig. 2b, include: a single-phase breaker unit 131 and a three-phase breaker unit 132.

An input terminal of the single-phase breaker unit 131 serves as a single-phase input terminal of the breaker unit 130; the first output end of the single-phase circuit breaker unit 131 is electrically connected with the single-phase bus through a connecting wire, and the second output end is electrically connected with the single-phase bus through a connecting wire.

The input of the three-phase breaker unit 132 serves as the three-phase input of the breaker unit 130; the first output end of the three-phase circuit breaker unit 132 is electrically connected to the three-phase bus through a connecting wire, and the second output end is electrically connected to the three-phase bus through a connecting wire.

And whether each connecting line is connected or not is controlled and operated by practical training personnel.

The specific structure of one embodiment of the inverter unit 120, as shown in fig. 2a and 2b, includes: a single-phase inverter 121, a first single-phase circuit breaker 122, a second single-phase circuit breaker 123, and a three-phase inverter 124.

The dc side of the three-phase inverter 124 is electrically connected to the output of the first single-phase circuit breaker 122, the input of the first single-phase circuit breaker 122 is electrically connected to the output of the second single-phase circuit breaker 123, the input of the second single-phase circuit breaker 123 is electrically connected to the dc side of the single-phase inverter 121, and the connection point is the dc side of the inverter unit 120.

The ac side of the single-phase inverter 121 is electrically connected to the input of the single-phase circuit breaker unit 131 through a connection line, and the ac side of the three-phase inverter 124 is electrically connected to the input of the three-phase circuit breaker unit 132 through a connection line.

Alternatively, the single-phase inverter 121 may be a 5kW single-phase photovoltaic inverter, and specific parameters thereof can be shown in table 2; the three-phase inverter 124 may be a 5kW three-phase photovoltaic inverter, the specific parameters of which may be seen in table 3.

TABLE 2

Maximum DC power	6500W
		Full load MPPT voltage range	250-550V
Maximum short-circuit current	13.8A
		Maximum input current	11A
Rated output power	5000W
		Maximum apparent power	5000VA
Maximum output current	22.8A
		Maximum efficiency	97.8％
Weight (D)	14kg

TABLE 3

Maximum DC power	6500W
		Full load MPPT voltage range	240-800V
Maximum short-circuit current	13.8A
		Maximum input current	11A
Rated output power	5000W
		Maximum apparent power	5000VA
Maximum output current	8.5A
		Maximum efficiency	98％
Weight (D)	24kg

It should be noted that the dc side port of the three-phase inverter 124 is connected in parallel with the dc side port of the single-phase inverter 121, so that one dc power supply can be shared, and the cost of the whole practical training device is reduced without affecting the function thereof.

The specific structure of one embodiment of the load branch 140, as shown in fig. 2a and 2b, includes: a single-phase load branch 141 and a three-phase load branch 142.

The power supply end of the single-phase load branch 141 is electrically connected with the single-phase bus through a connecting wire; the power supply end of the three-phase load branch 142 is electrically connected with the three-phase bus through a connecting wire.

In practical applications, a specific implementation form of the single-phase load branch 141, as shown in fig. 2a and fig. 2b, includes: a first single-phase ac load 1411, a second single-phase ac load 1412, and a third single-phase breaker 1413.

The power supply terminal of the first single-phase ac load 1411 is electrically connected to the output terminal of the third single-phase circuit breaker 1413 via a connection line.

The power supply terminal of the second single-phase alternating-current load 1412 is electrically connected with the output terminal of the third single-phase breaker 1413 through a connecting wire.

It should be noted that the first single-phase ac load 1411 and the second single-phase ac load 1412 are adjustable loads, and their resistance values may be adjusted accordingly according to actual requirements.

Specifically, the input terminal of the third single-phase breaker 1413 is used as a power supply terminal of the single-phase load branch 141, and is configured to disconnect the ac load from the single-phase bus in time when the first single-phase ac load 1411 or the second single-phase ac load 1412 fails.

Further, the training personnel can access the connection line between the power supply terminal of the first single-phase alternating current load 1411 and the output terminal of the third single-phase circuit breaker 1413 to the corresponding port and/or the connection line between the power supply terminal of the second single-phase alternating current load 1412 and the output terminal of the third single-phase circuit breaker 1413 to the corresponding port according to requirements.

In practical applications, a specific implementation form of the three-phase load branch 142, as shown in fig. 2a and 2b, includes: a first three-phase ac load 1421, a second three-phase ac load 1422, and a first three-phase breaker 1423.

The power supply terminal of the first three-phase ac load 1421 is electrically connected to the output terminal of the first three-phase circuit breaker 1423 via a connection line.

The power supply terminal of the second three-phase ac load 1422 is electrically connected to the output terminal of the first three-phase circuit breaker 1423 via a connection line.

It should be noted that the first three-phase ac load 1421 and the second three-phase ac load 1422 are adjustable loads, and the resistance values thereof can be adjusted accordingly according to actual requirements.

Specifically, the input end of the first three-phase circuit breaker 1423 serves as a power supply end of the three-phase load branch 142, and is configured to disconnect the ac load from the three-phase bus in time when the first three-phase ac load 1421 and/or the second three-phase ac load 1422 fails.

Further, the training personnel can access the connecting line between the power supply end of the first three-phase alternating current load 1421 and the output end of the first three-phase circuit breaker 1423 to the corresponding port, and/or access the connecting line between the power supply end of the second three-phase alternating current load 1422 and the output end of the first three-phase circuit breaker 1423 to the corresponding port according to the requirement.

The specific structure of an embodiment of the output branch 150, as shown in fig. 2a and 2b, includes: a single-phase output branch 151 and a three-phase output branch 152.

The input end of the single-phase output branch 151 is electrically connected with the single-phase bus through a connecting wire; the output end of the single-phase output branch 151 serves as a single-phase output end of the output branch 150.

The input end of the three-phase output branch 152 is electrically connected with the three-phase bus through a connecting line; the output of the three-phase output branch 152 serves as the three-phase output of the output branch 150.

In practical applications, an embodiment of the single-phase output branch 151, as shown in fig. 2a and 2b, includes: a first ac contactor KM1 and a first metering module 1511.

The input end of the first ac contactor KM1 serves as the input end of the single-phase output branch 151, and the output end serves as the output end of the single-phase output branch 151.

The detection end of the first metering module 1511 is disposed at the output end of the first ac contactor KM 1.

It should be noted that the first ac contactor KM1 is used for disconnecting the connection between the distributed photovoltaic grid-connected practical training device and the power grid when a fault occurs; in addition, the detection end of the first metering module 1511 is used for measuring the electric quantity output by the distributed photovoltaic grid-connected practical training device by monitoring the current and voltage output by the distributed photovoltaic grid-connected practical training device.

In practical applications, one embodiment of the three-phase output branch 152, as shown in fig. 2a and 2b, includes: a second ac contactor KM2 and a second metering module 1521.

The input end of the second ac contactor KM2 serves as the input end of the three-phase output branch 152, and the output end serves as the output end of the three-phase output branch 152.

The detection end of the second metering module 1521 is disposed at the output end of the second ac contactor KM 2.

It should be noted that the second ac contactor KM2 is used for disconnecting the connection between the distributed photovoltaic grid-connected practical training device and the power grid when a fault occurs; in addition, the detection end of the second metering module 1521 is used for measuring the electric quantity output by the distributed photovoltaic grid-connected practical training device by monitoring the current and the voltage output by the distributed photovoltaic grid-connected practical training device.

More preferably, the specific structure of one embodiment of the single-phase circuit breaker unit 131, as shown in fig. 2a and 2b, comprises: a fourth single-phase circuit breaker 1311 and a fifth single-phase circuit breaker 1312.

The input terminal of the fourth single-phase circuit breaker 1311 is electrically connected to the input terminal of the fifth single-phase circuit breaker 1312 by a connection line, and the connection point serves as the input terminal of the single-phase circuit breaker unit 131.

Wherein, the positive input end D2L of the fourth single-phase circuit breaker 1311 is electrically connected to the positive input end of the fifth single-phase circuit breaker 1312 by a connecting line, and the connecting point is used as the positive input end of the single-phase circuit breaker unit 131; the negative input D2N of the fifth single-phase breaker 1311 is electrically connected to the negative input D4N of the fifth single-phase breaker 1312 by a connecting line, which serves as the negative input of the single-phase breaker unit 131.

In the present embodiment, the ac side of the single-phase inverter 121 is electrically connected to two single-phase breakers, that is, the ac side of the single-phase inverter constitutes two parallel output branches, that is, the two output branches can be used as two single-phase inverters.

The output terminal of the fourth single-phase breaker 1311 serves as a first output terminal of the single-phase breaker unit 131.

Wherein the positive output terminal D1L of the fourth single-phase breaker 1311 serves as a first positive output terminal of the single-phase breaker unit 131, and the negative output terminal D1N serves as a first negative output terminal of the single-phase breaker unit 131.

The output of the fifth single-phase breaker 1312 serves as a second output of the single-phase breaker unit 131.

Wherein the positive output D3L of the fifth single-phase breaker 1312 serves as the second positive output of the single-phase breaker unit 131 and the negative output D3N serves as the second negative output of the single-phase breaker unit 131.

Optionally, another single-phase circuit breaker may be respectively disposed between the fourth single-phase circuit breaker 1311 and the bus, and between the fifth single-phase circuit breaker 1312 and the bus, so that other devices may be connected in parallel between the fourth single-phase circuit breaker 1311 and the another circuit breaker, and/or between the fifth single-phase circuit breaker 1312 and the another circuit breaker.

Also, a detailed structure of one preferred embodiment of the three-phase breaker unit 132, as shown in fig. 2a and 2b, includes: a second three-phase breaker 1321 and a third three-phase breaker 1322.

The input terminal of the second three-phase breaker 1321 is electrically connected to the input terminal of the third three-phase breaker 1322 via a connection line, and the connection point serves as the input terminal of the three-phase breaker unit 132.

It should be noted that the positive input end of the second three-phase circuit breaker 1321 is electrically connected to the positive input end of the third three-phase circuit breaker 1322 through a connecting line, and the connection point is used as the positive input end of the three-phase circuit breaker unit 132, wherein three positive input ends D6A, D6B, and D6C of the second three-phase circuit breaker 1321 are electrically connected to three positive input ends D8A, D8B, and D8C of the third three-phase circuit breaker 1322 through connecting lines, respectively; the negative input D6N of the second three-phase breaker 1321 is electrically connected to the negative input D8N of the third three-phase breaker 1322 via a connecting line, which serves as the negative input of the three-phase breaker unit 132.

Furthermore, in the present embodiment, the ac side of the three-phase inverter 124 is electrically connected to two three-phase circuit breakers, that is, the ac side of the three-phase inverter forms two parallel output branches, that is, the two output branches can be used as two single-phase inverters.

The output of the second three-phase breaker 1321 serves as a first output of the three-phase breaker unit 132.

It should be noted that the positive output terminal of the second three-phase circuit breaker 1321 is connected to the first positive output terminal of the three-phase circuit breaker unit 132, wherein the positive output terminal of the second three-phase circuit breaker 1321 includes three positive output terminals D5A, D5B and D5C; the negative output D5N of the second three-phase breaker 1321 serves as a first negative output of the three-phase breaker unit 132.

The output of the third three-phase breaker 1322 serves as a second output of the three-phase breaker unit 132.

It should be noted that the positive output terminal of the third three-phase breaker 1322 and the second positive output terminal of the three-phase breaker unit 132 are connected, where the positive output terminal of the third three-phase breaker 1322 includes three positive output terminals D7A, D7B and D7C; the negative output D7N of the third three-phase breaker 1322 serves as the second negative output of the three-phase breaker unit 132.

Alternatively, another three-phase breaker may be disposed between the second three-phase breaker 1321 and the bus bar, and between the third three-phase breaker 1322 and the bus bar, so that other devices are connected in parallel between the second three-phase breaker 1321 and the other breaker, and between the third three-phase breaker 1322 and the other breaker.

Through the above-mentioned specific structure of the internal circuit that this embodiment provided, can make real training personnel through the operation to each connecting wire in this real device of instructing that the grid-connected to distributed photovoltaic, realize four following schemes of being incorporated into the power networks of distributed photovoltaic:

a specific circuit of the first grid-connected scheme is shown in fig. 3a (black components in fig. 3a, fig. 3b, fig. 3c and fig. 3d represent a circuit breaker, white components represent a circuit breaker or a load switch), a public connection point is a public power grid distribution box or a public power grid line, and if the installed power of a single grid-connected point is not more than 10kW, single-phase access is adopted; and if the installed power of a single grid-connected point is not more than 100kW, adopting three-phase access.

The specific circuit of the second grid-connected scheme is shown in fig. 3b, the public connection point is a public connection point and is a public power grid distribution room or box transformer low-voltage bus, and the reference installed capacity of a single grid-connected point is 20-200 kilowatts.

The specific circuit of the third grid-connected scheme is shown in fig. 3c, the public connection point is a public power grid distribution box or line, and if the reference installed capacity of a single grid-connected point is not more than 10kW, single-phase access is adopted; and if the reference installed capacity of a single grid-connected point is not more than 200kW, adopting three-phase access.

The specific circuit of the fourth grid-connected scheme is shown in fig. 3d, the public connection point is a public power grid distribution box or line, and if the reference installed capacity of a single grid-connected point is not more than 10kW, single-phase access is adopted; and if the reference installed capacity of a single grid-connected point is not more than 200kW, adopting three-phase access.

The rest of the structure and the principle are the same as those of the above embodiments, and are not described in detail here.

In another embodiment of the present invention, an implementation manner of the internal circuit 10, as shown in fig. 2a and fig. 2b, further includes, on the basis of the above embodiment: a third metering module 210, a fourth metering module 220, a fifth metering module 230, and a sixth metering module 240.

Specifically, the detection end of the third metering module 210 is disposed at the output end of the fourth single-phase circuit breaker 1311, and is configured to monitor the current and the voltage output by the single-phase inverter 121, so as to meter the electric quantity output by the single-phase inverter 121.

Specifically, the detection end of the fourth metering module 220 is disposed at the output end of the fifth single-phase circuit breaker 1312, and is configured to monitor the current and the voltage output by the single-phase inverter 121, so as to further meter the electric quantity output by the single-phase inverter 121.

Specifically, the detection end of the fifth metering module 230 is disposed at the output end of the second three-phase circuit breaker 1321, and is configured to monitor the current and the voltage output by the three-phase inverter 124, so as to meter the electric quantity output by the three-phase inverter 122.

Specifically, the detection end of the sixth metering module 240 is disposed at the output end of the third three-phase circuit breaker 1322, and is configured to monitor the current and the voltage output by the three-phase inverter 124, so as to meter the electric quantity output by the three-phase inverter 122.

It should be noted that the third metering module 210, the fourth metering module 220, the fifth metering module 230, and the sixth metering module 240 all conform to the grid company regulations.

It should be noted that, by using the third metering module 210, the fourth metering module 220, the fifth metering module 230, and the sixth metering module 240, and by combining the first metering module 1511 and the second metering module 1521, the practical training of the metering settlement of the surplus power on-line can be provided for the practical training personnel.

The utility model discloses in another embodiment, a concrete implementation scheme of real device of instructing of distributing type photovoltaic grid-connected is provided, on the basis of above-mentioned embodiment, still include: a housing 20.

The housing 20 is provided with an internal circuit 10 therein; the front panel outside the housing 20 is marked with the electrical schematic of the internal circuitry 10 as shown in fig. 4a and 4 b.

It should be noted that the operation panels of the single-phase inverter, the three-phase inverter, the first single-phase load, the second single-phase load, the first three-phase load, and the second three-phase load in the internal circuit 10 are respectively disposed at corresponding positions of the schematic circuit diagram.

The corresponding ports of the internal circuit 10 connected with the connecting lines are arranged at corresponding positions in the circuit schematic diagram in the form of plug connectors.

In practical application, a practical training cabinet with the width of 2800mm, the height of 2000mm and the depth of 800mm can be selected as a shell of the distributed photovoltaic grid-connected practical training device; drawing a schematic diagram of the internal circuit 10 on the front cabinet surface; in addition, the cabinet body adopts the lower inlet wire mode, is applicable to and installs at indoor environment.

When the internal circuit 10 further includes the third metering module 210, the fourth metering module 220, the fifth metering module 230, and the sixth metering module 240, a metering display panel of the third metering module 210, a metering display panel of the fourth metering module 220, a metering display panel of the fifth metering module 230, and a metering display panel of the sixth metering module 240 are further disposed on the front panel outside the housing, and the input end of each metering display panel is connected to the output end of the corresponding metering module.

When the single-phase output branch in the internal circuit 10 includes the first metering module 1511, a metering display panel of the first metering module 1511 is further disposed on the front panel outside the housing, and an input end of the metering display panel of the first metering module 1511 is connected to an output end of the first metering module 1511.

When the three-phase output branch in the internal circuit 10 includes the second metering module 1521, a metering display panel of the second metering module 1521 is further disposed on the front panel outside the housing, and an input end of the metering display panel of the second metering module 1521 is connected to an output end of the second metering module 1521.

Compared with the prior art, the utility model provides a real device of instructing of distributed photovoltaic grid-connected, draw the schematic diagram of internal circuit on the front panel, lead the port of each equipment to the corresponding position of front panel with the form of plug joint, make real personnel of instructing can operate in the mode of patchcord before the cabinet, make things convenient for real personnel of instructing to operate; moreover, the practical training device completely adopts real equipment, and the equipment is mainstream equipment in the current market, so that practical operation and maintenance training close to engineering can be provided for practical training personnel.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The utility model provides a real device of instructing that distributes type photovoltaic is incorporated into power networks which characterized in that includes: an internal circuit; the internal circuit includes: the device comprises a direct-current power supply, an inverter unit, a breaker unit, a load branch and an output branch; wherein:

2. The distributed photovoltaic grid-connected practical training device according to claim 1, wherein the bus comprises: single-phase bus and three-phase bus.

3. The distributed photovoltaic grid-connected practical training device according to claim 2, wherein the breaker unit comprises: a single-phase circuit breaker unit and a three-phase circuit breaker unit; wherein:

4. The distributed photovoltaic grid-connected practical training device according to claim 2, wherein the inverter unit comprises: the system comprises a single-phase inverter, a first single-phase circuit breaker, a second single-phase circuit breaker and a three-phase inverter; wherein:

5. The distributed photovoltaic grid-connected practical training device according to claim 2, wherein the load branch comprises: a single-phase load branch and a three-phase load branch; wherein:

6. The distributed photovoltaic grid-connected practical training device according to claim 5, wherein the single-phase load branch comprises: a first single-phase alternating current load, a second single-phase alternating current load, and a third single-phase circuit breaker; the three-phase load branch comprises: a first three-phase alternating current load, a second three-phase alternating current load and a first three-phase circuit breaker; wherein:

7. The distributed photovoltaic grid-connected practical training device according to claim 2, wherein the output branch comprises: the single-phase output branch circuit and the three-phase output branch circuit; wherein:

8. The distributed photovoltaic grid-connected practical training device according to claim 7, wherein the single-phase output branch comprises: the system comprises a first alternating current contactor and a first metering module; the three-phase output branch comprises: a second ac contactor and a second metering module; wherein:

9. The distributed photovoltaic grid-connected practical training device according to claim 3, wherein the single-phase circuit breaker unit comprises: a fourth single-phase circuit breaker and a fifth single-phase circuit breaker; the three-phase circuit breaker unit includes: a second three-phase circuit breaker and a third three-phase circuit breaker; wherein:

10. The distributed photovoltaic grid-connected practical training device according to any one of claims 1 to 9, wherein the internal circuit further comprises: a plurality of metering modules; wherein:

11. The distributed photovoltaic grid-connected practical training device according to any one of claims 1-9, further comprising: a housing; wherein:

the internal circuit is arranged inside the shell;

12. The distributed photovoltaic grid-connected practical training device according to claim 11, wherein the internal circuit further comprises: the detection end of each metering module is respectively arranged at the output end of each circuit breaker in the circuit breaker unit;