CN216215926U

CN216215926U - Distributed photovoltaic power generation system

Info

Publication number: CN216215926U
Application number: CN202122578238.0U
Authority: CN
Inventors: 王建均; 侯香玲; 罗春来
Original assignee: Tianjin Xinzhan Expressway Co ltd
Current assignee: Tianjin Xinzhan Expressway Co ltd
Priority date: 2021-10-25
Filing date: 2021-10-25
Publication date: 2022-04-05
Anticipated expiration: 2031-10-25

Abstract

The application relates to a distributed photovoltaic power generation system, which relates to the field of photovoltaic power generation and comprises a photovoltaic array, wherein the photovoltaic array is formed by connecting a plurality of monocrystalline silicon battery components; the inverter is connected with the photovoltaic array, inverts the received direct current into alternating current and outputs the alternating current; the grid-connected cabinet receives the alternating current output by the inverter, outputs the alternating current to the power grid side and is connected with a low-voltage bus of the power grid; the inverter is internally provided with a string detection module, a direct current bus, an inversion unit circuit and an alternating current filter; the string detection module is connected with the monocrystalline silicon battery assembly, acquires direct current generated by the monocrystalline silicon battery assembly and converges the direct current into a direct current bus; the direct current bus outputs a path of direct current to the inversion unit circuit, and the direct current is inverted into alternating current; one end of the alternating current filter is connected with the inversion unit circuit, receives alternating current inverted by the inversion unit circuit, outputs filtered alternating current and is connected with the grid-connected cabinet. The method and the device have the effects that the user can use the power automatically and automatically, and the residual power can be used for surfing the internet.

Description

Distributed photovoltaic power generation system

Technical Field

The application relates to the field of photovoltaic power generation, in particular to a distributed photovoltaic power generation system.

Background

In life and industrial electricity, most users use the electricity of a power grid, and transmission lines of the power grid are distributed all over the places.

The power generation of the power grid comprises thermal power generation, hydroelectric power generation, wind power generation and other renewable energy sources. In the traditional power generation technology, the electric quantity generated by a power plant is transmitted to a corresponding area through a high-voltage wire, and then is changed into the electric quantity in daily life through a transformer to be supplied to people for use.

However, in the conventional power generation technology, the quality of electric energy is reduced due to the influence of external factors in the process of power transmission, and especially in the power supply of factories and the like far away from the urban area, the power supply loss is large in long-distance transportation, the power supply is difficult, the power is easily cut off, and the production life of the factories is influenced.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems of difficult power supply, easy power failure and large power supply loss of a factory far away from a downtown, the application designs a distributed photovoltaic power generation system, which is realized by the following mode:

a distributed photovoltaic power generation system comprises a photovoltaic array, a photovoltaic power generation system and a control system, wherein the photovoltaic array is formed by connecting a plurality of monocrystalline silicon battery assemblies and is used for generating direct current;

the input of the inverter is connected with the photovoltaic array, and the received direct current is inverted into alternating current and output;

the grid-connected cabinet is used for receiving the alternating current output by the inverter, outputting the alternating current to the power grid side and connecting the alternating current with a low-voltage bus of the power grid;

the alternating current cable is connected with the grid-connected cabinet and the inverter and provides a path for transmitting alternating current;

the inverter is internally provided with a string detection module, a direct current bus, an inversion unit circuit and an alternating current filter;

the string detection module is connected with the monocrystalline silicon battery assembly and is used for acquiring direct current generated by the monocrystalline silicon battery assembly;

the direct current bus is connected with the string detection module, collects multiple paths of direct currents, and forms a path of direct current to be output to the inversion unit circuit;

one end of the inversion unit circuit is connected with the direct current bus, and the other end of the inversion unit circuit is connected with the alternating current filter and is used for inverting the direct current into alternating current and outputting the alternating current;

one end of the alternating current filter is connected with the inversion unit circuit, receives alternating current inverted by the inversion unit circuit, outputs filtered alternating current and is connected with the grid-connected cabinet.

By adopting the technical scheme, the string detection module in the inverter acquires direct current generated by each monocrystalline silicon battery component in the photovoltaic array, the direct current is converged to the direct current bus, one path of total direct current is output by the direct current bus to the inversion unit circuit, the direct current is converted into alternating current through the inversion unit circuit, the initial condition of grid connection with a power grid is met, the alternating current is input to the alternating current filter, high-frequency harmonic waves existing in the current are filtered, the power supply quality is improved, and the impact on the power grid is effectively reduced when the power grid is connected.

The grid-connected cabinet receives alternating current transmitted by the inverter, and the alternating current is connected with a low-voltage bus at the side of a power grid through an alternating current cable after being gathered, so that power generation and grid connection of a group of photovoltaic arrays are realized; and the grid-connected cabinet collects all alternating current and outputs the alternating current to the power grid side.

The user firstly uses the electric energy generated by the power generation system, and when the electric quantity is sufficient, the residual electric energy is transmitted to the power grid to realize the surfing; when the generated energy is insufficient for the user to use, the user load can use the electric quantity of part of the power grid.

Optionally, a direct current EMI filter is arranged inside the inverter;

one end of the direct current EMI filter is connected with the string detection module and used for receiving the direct current output by the string detection module, the other end of the direct current EMI filter is connected with the direct current bus, and the direct current passing through the direct current EMI filter is output to the direct current bus to be converged.

By adopting the technical scheme, the direct current EMI (electro Magnetic interference) filter can prevent electromagnetic interference between the monocrystalline silicon battery component and the inverter unit circuit, effectively prevent radiation of the solar panel, and ensure reliable operation of the monocrystalline silicon battery component.

Optionally, an MPPT circuit module is further connected between the dc EMI filter and the dc bus; the MPPT circuit modules are arranged in a plurality, and each MPPT circuit module corresponds to each monocrystalline silicon battery component in the photovoltaic array.

By adopting the technical scheme, the MPPT (maximum Power Point tracking) circuit module can track the maximum Power Point generated by the monocrystalline silicon battery component, and each direct current is converged to the direct current bus so that the inverter can continuously invert with the maximum output Power, thereby effectively improving the generating efficiency of the photovoltaic array.

Optionally, an alternating current EMI filter is arranged inside the inverter;

one end of the alternating current EMI filter is connected with the alternating current filter, and alternating current is output through the alternating current EMI filter.

By adopting the technical scheme, the alternating current EMI filter can inhibit electromagnetic interference, weaken ripples and higher harmonics which are not weakened by the alternating current filter, effectively inhibit the influence of high-frequency interference in a power grid on the equipment, and also effectively inhibit the interference of a power generation end on an alternating current power grid.

Optionally, a direct current lightning arrester and an alternating current lightning arrester are arranged inside the inverter;

one end of the direct current lightning protector is connected with the output end of the group string detection module, and the other end of the direct current lightning protector is grounded; one end of the alternating current lightning protector is connected with the output end of the alternating current EMI filter, and the other end of the alternating current lightning protector is grounded.

By adopting the technical scheme, the direct current lightning protector and the alternating current lightning protector play a lightning protection role, when the inverter is struck by lightning, instantaneous lightning current flees into the inverter, and the direct current lightning protector is introduced into the ground through instantaneous overcurrent at a direct current end, so that the inverter is not damaged by the lightning; the alternating current lightning protection device discharges instantaneous over current of the alternating current end to the ground, thereby not only protecting the inverter, but also effectively preventing part of over current from channeling into a power grid and causing impact on the power grid end.

Optionally, a grid-connected main circuit breaker, a grid-connected bus, a current meter, a disconnecting switch, a 01N01 circuit breaker, a 01N02 circuit breaker, a 01N03 circuit breaker and a 01H01 circuit breaker are arranged inside the grid-connected cabinet;

one ends of the 01N01 breaker, the 01N02 breaker, the 01N03 breaker and the 01H01 breaker are connected with a grid-connected bus, and the other end of the 01N01 breaker is connected with an alternating current cable of a 01N01 incoming line; the other end of the 01N02 breaker is connected with an alternating current cable of the 01N02 incoming line; the other end of the 01N03 breaker is connected with an alternating current cable of a 01N03 incoming line; the other end of the 01H01 breaker is connected with an alternating current cable of a 01H01 incoming line;

one end of the current measuring meter is connected with a grid-connected bus, and the other end of the current measuring meter is connected with a grid-connected main circuit breaker;

the other end of the grid-connected main circuit breaker is connected to the power grid side through the isolating switch.

By adopting the technical scheme, the grid-connected cabinet is connected with the power generation system and the power grid, when the power generation system has a fault, short-circuit current occurs in the grid-connected cabinet, the current is measured by the current meter, and is linked with the grid-connected main circuit breaker to break the grid-connected main circuit breaker and cut off the connection with the power grid, so that the fault current is prevented from being transmitted to the power grid; when the fluctuation occurs on the side of the power grid, the current meter measures the current and is linked with each breaker to quickly react to trip the switch; when the power generation system side breaks down and needs to be overhauled, the circuit breaker in the grid-connected cabinet can break the connection between the grid-connected cabinet and the power grid, the situation that the power grid transmits power back to the power generation system side is prevented, and the grid-connected cabinet can effectively improve the power supply reliability of the system.

Optionally, an alternating current combiner box is arranged between the inverter and the grid-connected cabinet;

the input of the alternating current combiner box is connected with the outputs of at least two groups of inverters, and the alternating current combiner box outputs a group of alternating current and is connected to the grid-connected cabinet through the alternating current cable.

Through adopting above-mentioned technical scheme, exchange the output that the collection flow box connects at least two sets of inverters to output alternating current all the way and be connected to the cabinet that is incorporated into the power networks, exchange the collection flow box and be favorable to reducing the connecting wire between inverter and the cabinet that is incorporated into the power networks, it is convenient to maintain, improves the reliability.

Optionally, a fuse, a bus bar and a second surge protector are arranged in the alternating current bus box; one end of the fuse is connected with the bus bar, and the other end of the fuse is connected with the second surge protector; and the other end of the second surge protector is grounded.

By adopting the technical scheme, the second surge protector can limit the instantaneous overvoltage within a certain range and can also effectively prevent lightning stroke; the fuse is used for backup protection of the second surge protector, when the second surge protector does not work normally, the fuse is used for protection, and the fuse and the second surge protector can protect the system when the system is impacted.

Optionally, the grid-connected cabinet is further provided with a current meter and a photovoltaic system electric energy meter;

one end of the current meter is connected with the grid-connected main circuit breaker, and the other end of the current meter is connected with the isolating switch and is used for measuring the total generated energy of the power generation system;

one end of the photovoltaic system electric energy meter is connected with the ammeter to display the total generated energy;

the other end of the photovoltaic system electric energy meter is connected between a power grid and a load.

By adopting the technical scheme, the ammeter counts the total generated energy of the power generation system and is connected with the photovoltaic system electric energy meter, the photovoltaic system electric energy meter displays the total generated energy of the power generation system, the photovoltaic system electric energy meter is a bidirectional electric energy meter, the total generated energy can be measured, the electric quantity value of power transmission on-line can be displayed when the power consumption of a user is less than the generated energy, and the electric quantity of a used power grid is displayed when the power consumption of the user is more than the total generated energy; the generated energy, the user electricity consumption and the power consumption of the power grid can be counted only by using one photovoltaic system electric energy meter, the cost is low, and the use is convenient.

Optionally, the distributed photovoltaic power generation system further includes a plant area communication networking module and a data acquisition module;

the data acquisition module is connected with the output of the inverter, acquires the output current information of the inverter and is connected with the plant area communication networking module;

the factory communication networking module comprises an acquisition terminal and a user terminal;

the acquisition terminal is connected with the data acquisition module;

the acquisition terminal is wirelessly connected with the user terminal and outputs acquired current information;

and the user terminal receives the current information sent by the acquisition terminal.

Through adopting above-mentioned technical scheme, data acquisition module carries out information acquisition to the alternating current after each dc-to-ac converter contravariant, passes to acquisition terminal with the information of gathering through the RS485 interface, and the information that rethread wireless communication's mode will be gathered passes to user terminal, makes things convenient for factory management personnel to know the electric energy quality in real time, accomplishes effective management.

In conclusion, the utility model has the following beneficial effects:

1. the photovoltaic power generation grid connection, the self-utilization of the electric quantity of a user and the net surfing of the residual electricity are realized by adopting equipment such as a photovoltaic array, a direct current switch, a direct current bus, an inversion unit circuit, an alternating current filter, a grid connection cabinet, an alternating current cable and the like.

2. Through the equipment adopting the direct current EMI filter, the MPPT circuit and the alternating current EMI filter, the power generation system is continuously inverted with the maximum output power, harmonic waves and voltage spikes are effectively filtered, and the electromagnetic interference is effectively inhibited.

3. The factory communication networking module is arranged, so that the function of monitoring the current and the voltage output by each inverter in real time is realized.

Drawings

FIG. 1 is an electrical wiring diagram of a distributed photovoltaic power generation system;

FIG. 2 is an electrical schematic diagram of a grid-connected cabinet of a distributed photovoltaic power generation system;

FIG. 3 is a schematic diagram of an arrangement of photovoltaic system electric energy meters of a distributed photovoltaic power generation system;

FIG. 4 is an electrical schematic of an inverter of a distributed photovoltaic power generation system;

FIG. 5 is an electrical schematic diagram of an AC combiner box of a distributed photovoltaic power generation system;

fig. 6 is a plant area communication networking diagram of a distributed photovoltaic power generation system.

Detailed Description

The following application is described in further detail with reference to the accompanying drawings.

The embodiment of the application discloses a distributed photovoltaic power generation system, as shown in fig. 1, comprising a photovoltaic array, a monocrystalline silicon battery component, an inverter, an alternating current combiner box, a grid-connected cabinet and an alternating current cable; the photovoltaic array is formed by connecting a plurality of monocrystalline silicon battery components, a plurality of photovoltaic arrays can be arranged according to a house, and five photovoltaic arrays are arranged in the embodiment; the inverters comprise a 01N01 inverter, a 01N02 inverter, a 01N03 inverter, a 01N04 inverter and a 01N05 inverter, and each inverter is connected with one photovoltaic array and used for collecting direct current generated by each single crystal silicon battery component in the corresponding photovoltaic array, converging the direct current into one path of direct current for inversion and outputting alternating current.

Referring to fig. 1, the grid-connected cabinet is a four-in one-out grid-connected cabinet, four load incoming lines are connected to a bus of the grid-connected cabinet, the four load incoming lines are respectively a 01N01 incoming line, a 01N02 incoming line, a 01N03 incoming line, and a 01H01 incoming line of the combiner box, and the outgoing lines are connected to a grid side.

Referring to fig. 1, a 01N01 inverter is connected with a 01N01 incoming line of a grid-connected cabinet, a 01N02 inverter is connected with a 01N02 incoming line of the grid-connected cabinet, a 0N103 inverter is connected with a 01N03 incoming line of the grid-connected cabinet, a 01N04 inverter is connected with a 01N04 incoming line of an ac combiner box, a 01N05 inverter is connected with a 01N05 incoming line of the ac combiner box, the ac combiner box is an ac combiner box with two incoming lines and one outgoing line, and the outgoing line of the ac combiner box is connected with a 01H01 combiner box incoming line of the grid-connected cabinet.

Sunlight rays irradiate to the monocrystalline silicon battery component to start power generation, a low-voltage direct-current power supply is generated, the generated direct current is inverted to 220V/50Hz alternating current through each inverter, the inverted 220V/50Hz alternating current is conveyed to a four-in one-out grid-connected cabinet through an alternating-current cable by a 01N101 inverter, a 01N02 inverter and a 01N03 inverter, the 220V/50Hz alternating current is divided into two paths to be converged into an alternating-current junction box, and then the two paths of alternating current are converged into the four-in one-out grid-connected cabinet through the alternating-current cable by the 01N04 inverter and the 01N05 inverter; and after receiving the four paths of alternating current, the grid-connected cabinet is connected to a power grid side through a cable, so that grid connection is realized. When the illumination is strong, the monocrystalline silicon battery component generates enough power, the electric energy used by the user side is the electric energy generated by photovoltaic power generation, and the rest electric energy is merged into a power grid to realize the function of remaining power on the Internet; when the light is insufficient, the single crystal silicon battery component generates less power, the generated electric quantity is completely used in the plant area of the single crystal silicon battery component, and part of electric energy of a power grid is used.

Referring to fig. 2, the grid-tied cabinet includes a disconnector, a current meter, a grid-tied main breaker, a 01N01 breaker, a 01N02 breaker, a 01N03 breaker, a 01H01 breaker, a grid-tied bus, and a first surge protector.

On four inlet lines of the grid-connected cabinet, a breaker is installed on each inlet line, one end of each of the 01N01 breakers, the 01N02 breakers, the 01N03 breakers and the 01H01 breakers is connected with a grid-connected bus and used for cutting or opening corresponding lines, when a certain line is overhauled, the breaker corresponding to the inlet line can be used for cutting the inlet line, the line and equipment on the line are overhauled, and other lines can normally generate electricity and are not affected.

An isolating switch, a current meter, a grid-connected main circuit breaker and a current meter are sequentially arranged on an outlet wire of a grid-connected bus; one end of the current meter is connected with the grid-connected bus, the other end of the current meter is connected with the grid-connected main circuit breaker, and one end of the grid-connected main circuit breaker, which is far away from the grid-connected bus, is connected with the current meter; one end of the isolating switch is connected with the current meter, and the other end of the isolating switch is connected to the power grid side through an alternating current cable.

The current measuring meter is a current transformer, measures the current on the line and plays a role of fault protection in linkage with the grid-connected main circuit breaker; when the system breaks down, the current meter detects instantaneous overcurrent of the system at the moment, the relay protection device is started, the grid-connected main breaker is disconnected, the connection with the power grid side is cut off, adverse effects of power grid fluctuation on the distributed power generation system are avoided, and meanwhile, the grid-connected main breaker can be disconnected when the power generation system breaks down, so that the influence of the faults on the power grid is avoided.

One end of the first surge protector is connected with the grid-connected bus, and the other end of the first surge protector is grounded; when the system is struck by lightning, instantaneous over-current which enters a power line can be discharged into the ground, the instantaneous over-voltage is limited within a voltage range which can be borne by the system, and the first surge protector can play a lightning protection role and protect the system from being damaged by the lightning.

One end of the current metering gauge is connected with the current measuring gauge, the other end of the current metering gauge is connected to the power grid side through the isolating switch, and the current metering gauge is sealed and visible and is used for counting the electric quantity which is emitted by the monocrystalline silicon battery component and transmitted into the power grid, namely for counting the generated energy.

Referring to fig. 3, the distributed photovoltaic power generation system further includes a photovoltaic system electric energy meter, and the photovoltaic system electric energy meter is divided into a gateway metering electric energy meter and a grid-connected electric energy meter. The grid-connected electric energy meter is connected with an ammeter of a grid-connected cabinet, and the total photovoltaic power generation amount of a user is counted; the gateway metering electric energy meter is a bidirectional electric energy meter, is connected between a power grid and a load and is used for calculating upper and lower power grids of a user and the power grid, and the electric quantity of the power grid used by the user and the electric quantity provided by the user to the power grid are displayed on the gateway metering electric energy meter.

When the power generation of a user is sufficient, redundant power generation is merged into the power grid, and the gateway metering electric energy meter displays the electric quantity merged into the power grid; when the generated energy is insufficient, the user needs to use the electric quantity of the power grid, and the used electric quantity of the power grid can be displayed in the gateway metering electric energy meter. The gateway metering electric energy meter displays the electric energy of the user on and off the network, and is installed by the electric power department.

Referring to fig. 4, a schematic diagram of an inverter is shown, in which a string detection module, a dc switch, a dc lightning arrester, a dc EMI filter, an MPPT circuit module, a dc bus, an inverter unit circuit, an ac filter, an ac relay, an ac EMI filter, and an ac lightning arrester are sequentially disposed inside the inverter; one end of the direct current lightning protector is connected with the output side of the direct current switch, and the other end of the direct current lightning protector is grounded; one end of the alternating current lightning protector is connected with a wire outlet end of the alternating current EMI filter, the other end of the alternating current lightning protector is connected with the ground, and when lightning current exists on the alternating current side, the alternating current lightning protector discharges the lightning current which flows into the power line into the ground; the direct current lightning protection device and the alternating current lightning protection device can play a role in lightning protection.

A plurality of groups of monocrystalline silicon battery components form a photovoltaic array, the monocrystalline silicon battery components in the photovoltaic array are all connected with an inverter, after the monocrystalline silicon battery components are irradiated by the sun to generate electricity, a string detection module in the inverter collects the direct current output of each monocrystalline silicon battery component and converges the outputs of all the monocrystalline silicon battery components into a direct current bus through a direct current switch, a direct current EMI filter and an MPPT circuit respectively, and the direct current bus converges current into one path and transmits the path to an inversion unit circuit for inversion.

The direct current EMI filter can filter harmonic waves in direct current power supply current, the filtered direct current power supply current is transmitted to the MPPT circuit modules, each MPPT circuit module corresponds to each single crystal silicon battery component, and the output power of photovoltaic power generation can be maximized. The MPPT circuit module monitors direct current emitted by the monocrystalline silicon battery component in real time, and carries out maximum power point tracking according to monitored information, so that each monocrystalline silicon battery component in the photovoltaic array is always output at the maximum power, and the generating efficiency of the whole photovoltaic array can be effectively improved.

The direct current bus gathers each path of direct current, and output a path of direct current to the contravariant unit circuit, carry out DC/AC conversion, output 220V, 50Hz alternating current after contravariant, the electric current of output is introduced into the alternating current filter, restrain because harmonic and voltage spike that the contravariant produced in the output current, the electric current after the filtering flows through alternating current relay and alternating current EMI filter, the alternating current EMI filter can effectively restrain electromagnetic interference, the electric current flows out the inverter finally, output the alternating current that does not have electromagnetic interference, high frequency harmonic is few, accord with the electric wire netting requirement.

Referring to fig. 5, the ac combiner box is a two-in one-out combiner box, and a first ac circuit breaker, a second ac circuit breaker, a third ac circuit breaker, a fuse, a combiner bus, and a second surge protector are disposed inside the ac combiner box; alternating current after being inverted by the 01N04 inverter and the 01N05 inverter is connected to an incoming line of a bus bar to form a 01N04 incoming line and a 01N05 incoming line; the bus bar converges the two paths into a path 01H01 outgoing line to output alternating current.

During normal power generation, alternating current inverted by the 01N04 inverter and the 01N05 inverter respectively flows into a bus bar, is output through a 01H01 outlet wire and is connected with a 01H01 inlet wire of a grid-connected cabinet, and the grid-connected cabinet receives the transmitted alternating current and is connected with the grid; the alternating current header box can reduce connecting wires between the inverter and the grid-connected cabinet, is convenient to maintain, and improves the power supply reliability.

Referring to fig. 5, a first ac breaker is provided on the bus bar incoming line 01N04 side, and a second ac breaker is provided on the bus bar incoming line 01N05 side; one end of the third alternating current breaker is connected with the bus bar, and the other end of the third alternating current breaker is connected with an alternating current cable and transmits the collected current into the grid-connected cabinet.

When the 01N05 incoming line and equipment thereof break down or need to be overhauled, the second alternating current circuit breaker is disconnected, the 01N05 incoming line and the equipment thereof are overhauled, and the 01N04 incoming line can normally transmit current to the grid-connected cabinet; when the 01N04 inlet wire breaks down or needs to be overhauled, the first alternating current circuit breaker is disconnected, the 01N04 inlet wire and equipment thereof are overhauled, the 01N05 inlet wire can normally transmit current to the grid-connected cabinet, and good power generation capacity is guaranteed during fault overhauling.

The third alternating current circuit breaker can be disconnected when the bus bar is overhauled, the third alternating current circuit breaker is also backup protection of the first alternating current circuit breaker and the second alternating current circuit breaker, and when a line is cut off, if the first alternating current circuit breaker or the second alternating current circuit breaker is not timely disconnected, the third alternating current circuit breaker can respond, and the protection effect is achieved.

Referring to fig. 5, one end of the fuse is connected with the bus, the other end is connected with a second surge protector, one end of the second surge protector, which is far away from the fuse, is grounded, and the second surge protector is used for preventing the system from being damaged by overvoltage and lightning stroke in the system. When the line is struck by lightning, the second surge protector works normally to enable the lightning current to be discharged into the ground, and the fuse cannot be fused due to long response time; when lightning strike occurs, if the second surge protector acts first, the follow current generated in the system by the lightning current cannot be normally cut off, the fuse responds, the circuit is disconnected, and the backup protection effect is achieved.

Referring to fig. 6, the distributed photovoltaic power generation system further includes a data acquisition module and a plant area communication networking module, the plant area communication networking module includes an acquisition terminal and a user terminal, the data acquisition module is connected to the output of each inverter, and the acquired output current information of the inverter is transmitted to the acquisition terminal through an RS485 interface; the acquisition terminal is connected with the user terminal in a wireless communication mode, and current information obtained by the acquisition terminal is transmitted to the user terminal, so that the measurement and real-time monitoring of electric energy generated by the power generation system are realized.

The implementation principle of the embodiment is as follows: the single crystal silicon battery components generate direct current under the irradiation of sunlight, the single crystal silicon battery components are connected in order to form a photovoltaic array, the photovoltaic array can be divided into different photovoltaic arrays according to different plant locations, and five groups of photovoltaic arrays are arranged in the embodiment and correspond to five groups of power generation paths.

After the five groups of photovoltaic arrays generate power, direct current is generated and is inverted by a 01N01 inverter, a 01N02 inverter, a 01N03 inverter, a 01N04 inverter and a 01N05 inverter respectively, the direct current is inverted into 50Hz/220V alternating current, and high-frequency harmonic filtering and interference suppression are performed in the inverting process.

Alternating current output by the 01N01 inverter, the 01N02 inverter and the 01N03 inverter after inversion is transmitted to the grid-connected cabinet and is used as three incoming lines of the grid-connected cabinet; alternating current output after inversion by the 01N04 inverter and the 01N05 inverter is converged into an alternating current convergence box, two paths of current are converged into one path, and then the one path of current is transmitted to a grid-connected cabinet, so that a 01H01 incoming line is formed.

The grid-connected cabinet is a four-inlet one-outlet grid-connected cabinet, after four inlet wires are collected, one path of alternating current on the output side is connected with the power grid side to realize grid connection, the factory power load is connected to the low-voltage side of the power grid, when the illumination is sufficient, the power generation amount of the photovoltaic array is more, the direct current is transmitted to the inverter, the inverter inverts the direct current into the alternating current of 50Hz/220V, and transmits the alternating current to the grid-connected cabinet to realize grid connection; the power load in the plant area directly uses the electric energy transmitted by the grid-connected cabinet, and the residual alternating current is transmitted to the power grid, so that the power utilization mode of spontaneous power utilization and Internet surfing of the residual power is realized; when sunlight irradiation is insufficient and power generation of the photovoltaic array is difficult to meet requirements, the photovoltaic array transmits power to the inversion unit circuit after power generation, the power is transmitted to the grid-connected cabinet after inversion, the electric energy inverted by the inverter is firstly used by the plant electric load, and the electric energy of the power grid is reused when the generated energy of the photovoltaic array is insufficient.

The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered by the protection scope of the utility model.

Claims

1. A distributed photovoltaic power generation system, its characterized in that: the photovoltaic array is formed by connecting a plurality of monocrystalline silicon cell assemblies and used for generating direct current;

2. A distributed photovoltaic power generation system according to claim 1, wherein: a direct current EMI filter is arranged in the inverter;

3. A distributed photovoltaic power generation system according to claim 2, wherein: an MPPT circuit module is also connected between the direct current EMI filter and the direct current bus; the MPPT circuit modules are arranged in a plurality, and each MPPT circuit module corresponds to each monocrystalline silicon battery component in the photovoltaic array.

4. A distributed photovoltaic power generation system according to claim 1, wherein: an alternating current EMI filter is arranged inside the inverter;

one end of the alternating current EMI filter is connected with the alternating current filter, and alternating current passes through the alternating current EMI filter and is output to the inverter.

5. A distributed photovoltaic power generation system according to claim 4, wherein: a direct current lightning protector and an alternating current lightning protector are arranged inside the inverter;

6. A distributed photovoltaic power generation system according to claim 1, wherein: a grid-connected main circuit breaker, a grid-connected bus, a current meter, a disconnecting switch, a 01N01 circuit breaker, a 01N02 circuit breaker, a 01N03 circuit breaker and a 01H01 circuit breaker are arranged in the grid-connected cabinet;

the other end of the grid-connected main circuit breaker is connected to the power grid side through an isolation switch.

7. The distributed photovoltaic power generation system of claim 6, wherein: an alternating current combiner box is arranged between the inverter and the grid-connected cabinet;

8. A distributed photovoltaic power generation system according to claim 7, wherein: a fuse, a bus bar and a second surge protector are arranged in the alternating current bus box; one end of the fuse is connected with the bus bar, and the other end of the fuse is connected with the second surge protector; and the other end of the second surge protector is grounded.

9. The distributed photovoltaic power generation system of claim 6, wherein: the grid-connected cabinet is also provided with a current meter and a photovoltaic system electric energy meter;

10. A distributed photovoltaic power generation system according to claim 1, wherein: the distributed photovoltaic power generation system also comprises a factory communication networking module and a data acquisition module;

the acquisition terminal is connected with the data acquisition module;