Novel distributed photovoltaic power generation contact system

Abstract

A novel distributed photovoltaic power generation contact system is characterized by comprising a photovoltaic cell assembly string, a string type inverter, a photovoltaic transformer box, a photovoltaic box variable wire inlet switch, a photovoltaic power source 6KV switch and a contact circuit, the photovoltaic cell assembly string is connected with the string type inverter in series, the string type inverter is connected into the photovoltaic transformer box, and the photovoltaic box variable wire inlet switch is connected with the photovoltaic power source 6KV switch. The photovoltaic transformer box is connected in series with the photovoltaic box variable incoming line switch, the photovoltaic box variable incoming line switch, the photovoltaic 6KV bus, the photovoltaic power supply 6KV switch and the station 6KV bus are connected in series, the contact line is arranged between adjacent photovoltaic buses, when the contact line is closed, two adjacent photovoltaic buses are connected in series, and when the contact line is closed, the photovoltaic power supply 6KV switch is connected in series with the station 6KV bus. The interconnection switches are arranged between the two photovoltaic buses in a pairwise mode, it can be guaranteed that light of a photovoltaic power generation system is not abandoned, photovoltaic power generation capacity is improved, economical efficiency is directly improved, a single-bus breaking structure is adopted, and on the basis that investment increase is limited, two paths of grid-connected outgoing lines are provided for each photovoltaic matrix.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic power generation, in particular to a novel distributed photovoltaic power generation communication system. Background Art

[0002] As a new type of clean and renewable energy, solar energy is an important alternative energy to traditional fossil energy. Photovoltaic power generation system is a common form of utilizing solar energy. Photovoltaic power generation system is mainly composed of solar panel components, controllers, inverters and energy storage devices. Since photovoltaic power generation is greatly affected by weather and is unstable, the corresponding energy storage device is particularly important. Moreover, with the rapid development of photovoltaic power generation systems and the increase of various devices with impact power, higher requirements are placed on the energy storage devices of photovoltaic power generation systems.

[0003] The existing photovoltaic matrices adopt a single-outlet mode, which has poor reliability. When an outlet fails, the output of the entire photovoltaic matrix is ​​blocked, and the matrix exits operation. The output of each matrix is ​​affected by the load absorption of the grid-connected line. When the load of the grid-connected line decreases, each photovoltaic matrix may abandon light, resulting in a waste of resources. In order to solve the above problems, a new distributed photovoltaic power generation communication system is proposed. Utility Model Content

[0004] According to the above technical problems, the utility model provides a new type of distributed photovoltaic power generation communication system, which is characterized by comprising a photovoltaic cell assembly string, a string inverter, a photovoltaic transformer box, a photovoltaic box-transformer incoming line switch, a photovoltaic power supply 6KV switch, and a communication line. The photovoltaic cell assembly string is connected in series with the string inverter, the string inverter is connected to the photovoltaic transformer box, the photovoltaic transformer box is connected in series with the photovoltaic box-transformer incoming line switch, the photovoltaic box-transformer incoming line switch, the photovoltaic 6KV bus, the photovoltaic power supply 6KV switch, and the plant 6KV bus are connected in series, and the communication line is arranged between adjacent photovoltaic busbars. When the communication line is closed, two adjacent photovoltaic busbars are connected in series.

[0005] Furthermore, the photovoltaic cell assembly string is composed of 24 components, and a total of 11 photovoltaic cell assemblies are connected in series into a string inverter. The string inverter is responsible for converting the DC power sent by the photovoltaic cell assembly string into AC power output. Each power generation unit has a total of 11 string inverters respectively connected to the corresponding inverter control switches. The photovoltaic transformer box includes an inverter control switch, a photovoltaic box transformer low-voltage side switch, and a transformer body. There are 11 inverter control switches in total, which are responsible for controlling the on-off of its own line. When the inverter fails and its own line trips, the photovoltaic box transformer high-voltage and low-voltage side switches respectively control the on-off of the line. The photovoltaic box transformer incoming line switch controls the on-off of the photovoltaic box transformer high-voltage side switch and the photovoltaic bus. The photovoltaic power supply 6KV switch is responsible for controlling the on-off between the photovoltaic bus and the factory bus.

[0006] Furthermore, the connecting line is equipped with a connecting switch, a current transformer, a lightning arrester, a grounding switch, a connecting switch, and a high-voltage live display. The connecting line is connected in series with a connecting switch and a connecting switch. A current transformer is installed on the connecting switch side, and a lightning arrester and a high-voltage live display are installed on both the connecting switch and the connecting switch side. A grounding switch is also installed on the connecting switch side.

[0007] Beneficial effects of the utility model:

[0008] The utility model sets interconnecting switches between two photovoltaic busbars in pairs. When a unit is under maintenance, the interconnecting switch and the interconnecting knife switch are closed, and the photovoltaic power generation unit corresponding to the maintenance unit can supply power to other plant buses. The non-maintenance units can use their photovoltaic power to operate, which can ensure that the photovoltaic power generation system does not abandon light, increase the photovoltaic power generation, and directly improve the economy. The single busbar breaking structure is adopted, and two grid-connected outgoing lines are provided for each photovoltaic matrix on the basis of limited investment increase. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is a schematic diagram of the overall structure of a new type of distributed photovoltaic power generation communication system of the utility model;

[0010] Figure 2 This is a schematic diagram of the communication line structure of a new type of distributed photovoltaic power generation communication system of the utility model;

[0011] As shown in the figure: 1 photovoltaic cell assembly string, 2 sets of string inverters, 3 photovoltaic transformer box, 4 photovoltaic box transformer incoming line switch, 5 photovoltaic power supply 6KV switch, 6 interconnection line, 7 interconnection switch, 8 current transformer, 9 lightning arrester, 10 grounding switch, 11 interconnection switch, 12 high voltage live display. DETAILED DESCRIPTION

[0012] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0013] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0014] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. In addition, the technical features involved in the different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0015] Example 1

[0016] The utility model provides a novel distributed photovoltaic power generation communication system, which is characterized by comprising a photovoltaic cell assembly string 1, a string inverter 2, a photovoltaic transformer box 3, a photovoltaic box-transformer incoming line switch 4, a photovoltaic power supply 6KV switch 5, and a communication line 6. The photovoltaic cell assembly string 1 is connected in series with the string inverter 2, the string inverter 2 is connected to the photovoltaic transformer box 3, the photovoltaic transformer box 3 is connected in series with the photovoltaic box-transformer incoming line switch 4, the photovoltaic box-transformer incoming line switch 4, the photovoltaic 6KV bus, the photovoltaic power supply 6KV switch 5, and the factory 6KV bus are connected in series, and the communication line 6 is arranged between adjacent photovoltaic busbars. When the communication line 6 is closed, two adjacent photovoltaic busbars are connected in series.

[0017] Furthermore, the photovoltaic cell assembly string 1 is composed of 24 components, and a total of 11 photovoltaic cell assembly strings 1 are connected to the string inverter 2. The string inverter 2 is responsible for converting the DC power sent by the photovoltaic cell assembly string 1 into AC power output. Each power generation unit has a total of 11 string inverters 2 respectively connected to the corresponding inverter control switches. The photovoltaic transformer box 3 includes an inverter control switch, a photovoltaic box transformer low-voltage side switch, and a transformer body. There are 11 inverter control switches in total, which are responsible for controlling the on-off of their own lines. When the inverter fails and the circuit breaker of its own line trips, the photovoltaic box transformer high-voltage and low-voltage side switches respectively control the on-off of the line. The photovoltaic box transformer incoming line switch 4 controls the on-off of the photovoltaic box transformer high-voltage side switch and the photovoltaic bus. The photovoltaic power supply 6KV switch 5 is responsible for controlling the on-off between the photovoltaic bus and the factory bus.

[0018] Furthermore, the contact line 6 is equipped with a contact switch 61, a current transformer 62, a lightning arrester 63, a grounding switch 64, a contact switch 65, and a high-voltage live display 65. The contact line 6 is connected in series with the contact switch 61 and the contact switch 65. The current transformer 62 is installed on the contact switch 61 side, and the lightning arrester 63 and the high-voltage live display 65 are installed on the contact switch 61 and the contact switch 65 sides. The grounding switch 64 is also installed on the contact switch 61 side.

[0019] Example 2

[0020] When in use, the photovoltaic power generation system has a total of 4 box-type transformers, which are connected to the 4 bus sections of the high-voltage plant power supply through 4 circuits to supply power. We set up interconnection lines 6 between the 2 busbars, which are connected to the 4 bus sections of the high-voltage plant power supply of the power plant respectively. The interconnection lines 6 are equipped with interconnection switches 61, current transformers 62, lightning protection, grounding and overvoltage protection devices, and interconnection switches 65. During the non-maintenance period, the loads carried by the 4 6KV systems are relatively large, and the interconnection switches 61 can be disconnected. Each photovoltaic power generation unit only supplies power to the corresponding 6KV system, and each photovoltaic power generation unit will not abandon light. When a unit is under maintenance, the interconnection switch 61 can be closed, and the photovoltaic power generation unit corresponding to the maintenance unit can supply power to other non-maintenance units. Powering the maintenance unit can ensure that the photovoltaic system does not abandon light, increase the photovoltaic power generation, and directly improve the economy of the power generation system. The contact switch 61 is used to control the on and off of the contact line 6 and the switch load, and has the function of protecting the contact line 6. The main function of the contact knife switch 65 is to separate or connect the circuit during line operation to achieve the purpose of personal safety and equipment protection. The function of the current transformer 62 is to transform the large current on the primary side into the small current on the secondary side, so as to calculate the photovoltaic power and the current collection of the protection device. The lightning protection is to protect against lightning waves and surges invading from the low-voltage distribution lines. The high-voltage live display 65 can display the high-voltage live status of the contact line 6, and the grounding knife switch 64 can connect or isolate the equipment from the ground.

[0021] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. The various components mentioned in the utility model are common technologies in the existing field. The technicians in this industry should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only to illustrate the principles of the utility model. Without departing from the spirit and scope of the utility model, the utility model will have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A new type of distributed photovoltaic power generation communication system, characterized by It includes a photovoltaic cell assembly string, a string inverter, a photovoltaic transformer box, a photovoltaic box-to-transformer incoming line switch, a photovoltaic power supply 6KV switch, and a communication line. The photovoltaic cell assembly string is connected in series with the string inverter, the string inverter is connected to the photovoltaic transformer box, the photovoltaic transformer box is connected in series with the photovoltaic box-to-transformer incoming line switch, the photovoltaic box-to-transformer incoming line switch, the photovoltaic 6KV bus, the photovoltaic power supply 6KV switch, and the factory 6KV bus are connected in series. The communication line is arranged between adjacent photovoltaic busbars. When the communication line is closed, two adjacent photovoltaic busbars are connected in series.

2. According to claim 1, a new type of distributed photovoltaic power generation communication system is characterized in that: The photovoltaic cell assembly string is composed of 24 components, and a total of 11 photovoltaic cell assemblies are connected in series into a string inverter. The string inverter is responsible for converting the DC power sent by the photovoltaic cell assembly string into AC power output. Each power generation unit has a total of 11 string inverters respectively connected to the corresponding inverter control switches. The photovoltaic transformer box includes an inverter control switch, a photovoltaic box transformer low-voltage side switch, and a transformer body. There are 11 inverter control switches in total, which are responsible for controlling the on-off of its own line. When the inverter fails and its own line trips, the photovoltaic box transformer high- and low-voltage side switches respectively control the on-off of the line. The photovoltaic box transformer incoming line switch controls the on-off of the photovoltaic box transformer high-voltage side switch and the photovoltaic bus. The photovoltaic power supply 6KV switch is responsible for controlling the on-off between the photovoltaic bus and the factory bus.

3. According to claim 2, a new type of distributed photovoltaic power generation communication system is characterized in that: The connecting line is equipped with a connecting switch, a current transformer, a lightning arrester, a grounding switch, a connecting switch, and a high-voltage live display. The connecting line is connected in series with a connecting switch and a connecting switch. A current transformer is installed on the connecting switch side. Lightning arresters and high-voltage live displays are installed on both the connecting switch and the connecting switch sides. A grounding switch is also installed on the connecting switch side.

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