CN107505877A - A kind of intelligent photovoltaic electricity generation system protector - Google Patents

Abstract

The invention discloses a protection device for an intelligent photovoltaic power generation system. Including current transformer, voltage transformer, analog input module, signal amplifying circuit, switch input module, relay output module and CPU; the cabinet is installed through the bracket; the cabinet is connected with the protective cabinet; the protective cabinet includes the cabinet, the cabinet There are upper and lower two-layer structures; the upper structure is equipped with DC switch cabinets, temperature and humidity sensors, smoke sensors, and inverters; the lower structure is equipped with control components. The invention provides safety guarantee for the intelligent photovoltaic power generation system.

Description

An intelligent photovoltaic power generation system protection device

technical field

The invention relates to a protection device, in particular to a protection device for an intelligent photovoltaic power generation system.

Background technique

With the continuous development of solar energy technology, more and more cities and enterprises have begun to use solar photovoltaic power generation panels to generate electricity. Photovoltaic combiner boxes and inverters are the key equipment of photovoltaic power plants. The combiner box is an important intermediate connection device used to connect the strings composed of multiple solar photovoltaic modules to the photovoltaic inverter. It is necessary for solar power stations, building photovoltaic integration and other large-scale photovoltaic power generation systems in commercial use. equipment. The inverter is the most important component of the photovoltaic power station. Its function is to convert the DC power generated by the photovoltaic modules into alternating current and output it to the next step-up transformer to raise it to 10KV/35KV and then merge it into the power grid. The inverter and the previous combiner box, DC switchgear and inverter form a combined inverter system.

The existing bus inverter system does not have a good bus inverter intelligent protection system. Because the inverter needs to withstand DC high voltage, high current and high power, the inverter room is usually located in the harsh environment of the field, the installation is scattered, and it is left unattended. In the currently constructed solar power plants, fire accidents of inverters and DC switchgear in the inverter room are relatively frequent.

Contents of the invention

The purpose of the present invention is to provide a protective device for an intelligent photovoltaic power generation system, which ensures the reliability and safety of the power generation system, and avoids the influence of power generation and major accidents caused by fires in inverters and DC switch cabinets.

In order to solve the above technical problems, the present invention provides the following technical solutions: a protective device for an intelligent photovoltaic power generation system, including a box body; a combiner box room for placing a combiner box and a control room arranged on one side of the combiner box room are arranged in the box; There is a controller in the control room; the controller includes a current transformer, a voltage transformer, an analog input module, a signal amplification circuit, a switch input module, a relay output module and a CPU; The input current and voltage are detected, the signal output terminals of the current transformer, the voltage transformer and the analog input module are respectively connected with the signal input terminals of the signal amplification circuit, and the signal output terminals of the signal amplification circuit are connected with the corresponding signal input terminals of the CPU; The signal output terminal of the switching value input module is connected with the remote signal signal input terminal of the CPU, the CPU control signal output terminal is connected with the signal input terminal of the relay output module, and the relay output module outputs control signals to control the on-off of the relay of the photovoltaic combiner box;

The box body is installed through a bracket; the box body is connected with the protective cabinet; the protective cabinet includes the cabinet body, and the upper and lower layers are arranged in the cabinet body; the upper layer structure is equipped with a DC switch cabinet, a temperature and humidity sensor, a smoke sensor, and an inverter; the lower layer A control assembly is arranged in the mechanism.

Further, the bracket includes a column, a beam arranged on the top of the column, and a fastening assembly for fixing the beam on the column; the fastening assembly includes a C-shaped frame, a left hoop and a right hoop; the left hoop and the right hoop pass through the fastening assembly. The fastening bolts are fixed on the column, one end of the C-shaped frame is connected with the left hoop or the right hoop through the fastening bolt, and the other end of the C-shaped frame is connected with the box body.

Further, the column includes a column body and a base arranged on the column body; the base is provided with a two-layer structure, including an upper base and a lower base; the lower base is fixedly arranged at the bottom of the column body; the upper base is connected with the guide column The guide groove set on the column body can be moved and connected, and the upper base is provided with a nut seat used in conjunction with the ball screw; the nut seat is rotatably connected to the upper base; the column body is also provided with a motor seat; the motor is set on On the motor seat, the output end of the motor is connected with the ball screw; the bottom of the upper base is also provided with a foot; the bottom of the foot is provided with a roller; the lower base is provided with a perforation.

Further, the four corners of the lower base are provided with bushings.

Further, the top of the cabinet is provided with a ventilation window; the inside of the ventilation window is provided with a filter layer; the top of the cabinet is also provided with an adjustable cover for closing the ventilation window; The side plate, the top beam and the electric cylinder arranged under the top beam; the top beam is connected with the top plate through the electric cylinder, and the two sides under the side plate are provided with support rods.

Further, a limit body is also provided at the end of the pole.

The beneficial effects achieved by the present invention are: the protective device of the present invention includes a plurality of boxes; a combiner box and a controller are arranged in the box; the controller includes a current transformer, a voltage transformer, an analog input module, a signal amplification circuit, Switch input module, relay output module and CPU; the controller can perform real-time monitoring and multi-channel detection, the controller can meet the requirements of high precision and high stability, the box is installed through the bracket; easy to install and disassemble, and easy to maintain; A plurality of cabinets are connected to the protective cabinet; the protective cabinet includes a cabinet, and the cabinet is provided with an upper and lower structure; the upper structure is provided with a DC switch cabinet, a temperature and humidity sensor, a smoke sensor, and an inverter; the lower structure is provided with a control components. When the DC switchgear and/or the inverter are overheated or there is smoke, the inverter will automatically trip and cut off the power, thus providing security for the smart photovoltaic power generation system.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings that need to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can also be obtained based on these drawings without creative effort.

Fig. 1 is a structural schematic diagram of the present invention.

Fig. 2 is a structural schematic diagram of the controller of the present invention.

Fig. 3 is a schematic structural view of the column of the present invention.

Fig. 4 is a structural schematic diagram of the top of the cabinet of the present invention.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention.

As shown in Figures 1-4, it is a protective device for an intelligent photovoltaic power generation system according to the present invention, which includes a plurality of boxes 1; a combiner box room 12 for placing a combiner box 11 is arranged in the box body 1, and a combiner box room 12 side control room 13; control room 13 is provided with a controller 14; Output module 146 and CPU147; Current transformer 141 and voltage transformer 142 detect the input current and voltage of photovoltaic cells respectively, and the signal output terminals of current transformer 141, voltage transformer 142 and analog input module 143 are respectively connected with signal amplification The signal input end of circuit 144 is connected, and the signal output end of signal amplification circuit 144 is connected with the corresponding signal input end of CPU147; Connected to the signal input terminal of the relay output module 146, the relay output module 146 outputs a control signal to control the on-off of the relay of the photovoltaic combiner box 11;

The cabinet 1 is installed through a bracket; multiple cabinets 1 are connected to the protective cabinet 2; the protective cabinet 2 includes a cabinet 25, and the cabinet 25 is provided with an upper and lower structure; the upper structure is provided with a DC switch cabinet 21, a temperature and humidity sensor 22. A smoke sensor 23 and an inverter 24; the lower mechanism is provided with a control assembly. The control component controls the on-off of the inverter 24 by receiving signals from the temperature and humidity sensor 22 and the smoke sensor 23 .

The bracket of the present invention includes a column 31, a beam 32 arranged at the top of the column, and a fastening assembly for fixing the beam on the column 31; the fastening assembly includes a C-shaped frame 331, a left hoop 332 and a right hoop 333; the left hoop 332 and the right hoop 333 are fixed on the column 31 by fastening bolts, one end of the C-shaped frame 331 is connected with the left hoop 332 or the right hoop 333 by fastening bolts, and the other end of the C-shaped frame 331 is connected with the box body 1 .

The column 31 of the present invention includes a column body 311 and a base arranged on the column body 311; the base is provided with a two-layer structure, including an upper base 312 and a lower base 313; the lower base 313 is fixedly arranged on the bottom of the column body 311; The upper base 312 is movably connected with the guide groove 315 provided on the column body 311 through the guide column 314, and the upper base 312 is provided with a nut seat 317 used in conjunction with the ball screw 316; the nut seat and the upper base 312 can be Rotation connection; the column body is also provided with a motor base 318; the motor 319 is arranged on the motor base 318, and the output end of the motor 319 is connected with the ball screw 316; the bottom of the upper base 312 is also provided with a leg 320; the bottom of the leg 320 is provided There are rollers 321; the lower base 313 is provided with perforations.

The four corners of the lower base 313 of the present invention are provided with sleeves.

The top of the cabinet 25 of the present invention is provided with a ventilation window 4; the inside of the ventilation window 4 is provided with a filter layer 41; the top of the cabinet 25 is also provided with an adjustable cover that closes the ventilation window; the adjustable cover includes a top plate 51 1. The side plate 52, the top beam 53 and the electric cylinder 54 arranged below the top beam are arranged around the top plate 51; the top beam 53 is connected with the top plate 51 through the electric cylinder 54; the two sides below the side plate 52 are provided with struts 55 .

The end of the pole of the present invention is also provided with a limiting body 6 .

The protection device of the present invention includes a plurality of boxes; a combiner box and a controller are arranged in the box; the controller includes a current transformer, a voltage transformer, an analog input module, a signal amplification circuit, a switch input module, a relay output module and CPU; the controller can perform real-time monitoring and multi-channel detection, the controller can meet the requirements of high precision and high stability, the cabinet is installed through the bracket; easy to install and disassemble, and easy to maintain; multiple cabinets are connected to the protective cabinet; The protective cabinet includes a cabinet body, which is provided with an upper and lower structure; the upper structure is provided with a DC switch cabinet, a temperature and humidity sensor, a smoke sensor, and an inverter; the lower structure is provided with a control component. When the DC switchgear and/or the inverter are overheated or there is smoke, the inverter will automatically trip and cut off the power, thus providing security for the smart photovoltaic power generation system.

The above embodiment is only a description of the preferred implementation of the present invention, and is not intended to limit the concept and scope of the present invention. Under the premise of not departing from the design concept of the present invention, ordinary engineers and technicians in the field make various technical solutions of the present invention. All modifications and improvements should fall within the scope of protection of the present invention, and the technical content claimed for protection in the present invention has been fully recorded in the technical requirements.

Claims (6)

1. A kind of 1. intelligent photovoltaic electricity generation system protector, it is characterised in that：Including casing（1）；Casing（1）Inside it is provided with and is used for Place header box（11）Chamber of confluxing（12）And it is arranged at chamber of confluxing（12）The control room of side（13）；Control room（13） Inside it is provided with controller（14）；Controller（14）Including current transformer（141）, voltage transformer（142）, analog input mould Block（143）, signal amplification circuit（144）, switching input module（145）, relay output module（146）And CPU（147）； Current transformer（141）And voltage transformer（142）The input current to photovoltaic cell, voltage detect respectively, and electric current is mutual Sensor（141）, voltage transformer（142）And Analog input mModule（143）Signal output part respectively with signal amplification circuit （144）Signal input part be connected, signal amplification circuit（144）Signal output part and CPU（147）Corresponding signal input part It is connected；Switching input module（145）Signal output part and CPU（147）Remote signalling amount signal input part be connected, CPU （147）Control signal output and relay output module（146）Signal input part be connected, relay output module（146） Output control signal controls photovoltaic combiner box（11）Relay break-make；

   Casing（1）Installed by support；Casing（1）With protection cabinet（2）Connection；Protection cabinet（2）Including cabinet（25）, cabinet（25） Inside it is provided with double-layer structure up and down；Direct-current switch cabinet is provided with superstructure（21）, Temperature Humidity Sensor（22）, smog sensing Device（23）And inverter（24）；Control assembly is provided with mechanism of lower floor.
2. 2. according to a kind of intelligent photovoltaic electricity generation system protector of claim 1, it is characterised in that：Support includes column（31）、 The crossbeam being arranged at the top of column（32）And crossbeam is fixed on column（31）On fastening assembly；Fastening assembly includes C-shaped Frame（331）, left anchor ear（332）With right anchor ear（333）；Left anchor ear（332）With right anchor ear（333）It is fixed on by fastening bolt vertical Post（31）On, C-shaped frame（331）One end pass through fastening bolt and left anchor ear（332）Or right anchor ear（333）Connection, C-shaped frame （331）The other end and casing（1）Connection.
3. 3. according to a kind of intelligent photovoltaic electricity generation system protector of claim 2, it is characterised in that：Column（31）Including column sheet Body（311）Be arranged at column body（311）On base；Base is provided with double-layer structure, including upper strata pedestal（312）With under Layer pedestal（313）；Lower floor's pedestal（313）It is fixedly installed on column body（311）Bottom；Upper strata pedestal（312）Pass through guiding Post（314）With being arranged at column body（311）On guide groove（315）Removable connection, upper strata pedestal（312）On be provided with Ball-screw（316）The nut seat being used cooperatively（317）；Nut seat and upper strata pedestal（312）It is rotatably connected；On column body It is additionally provided with motor cabinet（318）；Motor（319）It is arranged at motor cabinet（318）On, motor（319）Output end and ball-screw （316）Connection；Upper strata pedestal（312）Bottom is additionally provided with leg（320）；Leg（320）Bottom be provided with roller（321）； Lower floor's pedestal（313）On be provided with perforation.
4. 4. according to a kind of intelligent photovoltaic electricity generation system protector of claim 3, it is characterised in that：Lower floor's pedestal（313）Four Axle sleeve is provided with individual angle.
5. 5. according to a kind of intelligent photovoltaic electricity generation system protector of claim 4, it is characterised in that：Cabinet（25）Top set There is vent window（4）；Vent window（4）Inner side is provided with filtering meshes（41）；Cabinet（25）Top be additionally provided with and close vent window The adjustable cover plate closed；Adjustable cover plate includes top plate（51）, be arranged at top plate（51）The side plate of surrounding（52）, back timber（53）With And it is arranged at the electric cylinders below back timber（54）；Back timber（53）Pass through electric cylinders（54）With top plate（51）Connection, side plate（52）Lower section Both sides be provided with pole（55）.
6. 6. according to a kind of intelligent photovoltaic electricity generation system protector of claim 5, it is characterised in that：Pole（55）End also set It is equipped with limit body（6）.