CN111327272B - Solar photovoltaic power supply monitoring system - Google Patents
Solar photovoltaic power supply monitoring system Download PDFInfo
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- CN111327272B CN111327272B CN202010162608.XA CN202010162608A CN111327272B CN 111327272 B CN111327272 B CN 111327272B CN 202010162608 A CN202010162608 A CN 202010162608A CN 111327272 B CN111327272 B CN 111327272B
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 118
- 238000010248 power generation Methods 0.000 claims abstract description 45
- 238000007789 sealing Methods 0.000 claims description 22
- 238000004891 communication Methods 0.000 claims description 16
- 238000003780 insertion Methods 0.000 claims description 6
- 230000037431 insertion Effects 0.000 claims description 6
- 238000009413 insulation Methods 0.000 claims description 6
- 230000003111 delayed effect Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 238000007689 inspection Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
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- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S50/00—Monitoring or testing of PV systems, e.g. load balancing or fault identification
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/08—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems requiring starting of a prime-mover
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/70—Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Photovoltaic Devices (AREA)
Abstract
The application provides a solar photovoltaic power supply monitoring system, which comprises a monitoring host, a programmable controller, a sensor assembly and a monitoring power supply module; the monitoring host is provided with a touch screen; the programmable controller is connected with an expansion module through a parallel bus; the sensor assembly comprises a photovoltaic voltage sensor, a battery pack voltage sensor, a load voltage sensor, a temperature sensor and a current sensor; the sensor component transmits the signals detected by the sensor component to the programmable controller or the expansion module thereof; the monitoring host receives all signals through the programmable controller, processes the signals and displays the signals on the touch screen. According to the solar photovoltaic power generation system, the monitoring host and the programmable controller are used for monitoring the voltage, the current, the temperature and other parameters in the solar photovoltaic power generation system and displaying the parameters on the touch screen, and the power of the generator can be selectively started automatically according to the generated energy of the photovoltaic cell panel, so that the normal work of the battery pack is ensured, and the normal operation of the solar photovoltaic power generation system is guaranteed.
Description
Technical Field
The application relates to the technical field of solar power generation power supply monitoring, in particular to a solar photovoltaic power supply monitoring system.
Background
The photovoltaic power generation is based on the principle of photovoltaic effect, and solar energy is directly converted into electric energy by using a solar cell. The photovoltaic power generation system mainly comprises a solar panel (assembly), a controller and an inverter which are mainly composed of electronic components and do not relate to mechanical parts, so that the photovoltaic power generation equipment is extremely refined, reliable, stable, long in service life and simple and convenient to install and maintain.
Especially for remote areas, working scenes without commercial power (such as a natural gas pipeline monitoring station in the remote areas), the combination of a generator and a photovoltaic power generation system as a power supply is a preferable power supply scheme; at present, due to the fact that the combined power supply scheme is lack of monitoring, faults are not easy to find, and normal work of the working scene is affected.
Disclosure of Invention
The technical problem that this application will be solved provides a solar photovoltaic power supply monitored control system.
The technical problem to be further solved by the present application is to provide a solar photovoltaic power monitoring system, which is used for monitoring a solar photovoltaic power generation system; the solar photovoltaic power generation system comprises a plurality of photovoltaic cell panels, photovoltaic inverters corresponding to the photovoltaic cell panels and battery packs; the photovoltaic inverter is used for converting a power supply of a photovoltaic cell panel into direct current and then charging the battery pack; the battery pack and/or the photovoltaic inverter are used for supplying power to a load through the load power supply module; the emergency charging system further comprises a generator power supply, wherein the generator power supply is used for charging the battery pack through an emergency charging module in emergency;
the monitoring system comprises a monitoring host, a programmable controller in signal connection with the monitoring host, a sensor assembly and a monitoring power supply module; the monitoring host is provided with a touch screen and an alarm module; the programmable controller is connected with an expansion module through a parallel bus; the monitoring power supply module is configured to supply power to the monitoring host, the sensor assembly, the programmable controller and the expansion module;
the sensor assembly comprises a photovoltaic voltage sensor/a photovoltaic current sensor for detecting the output voltage/current of the photovoltaic cell panel, a battery pack voltage sensor/a battery pack current sensor for detecting the working voltage/current of the battery pack, a load voltage sensor for detecting the output voltage of the load power supply module and a temperature sensor for detecting the ambient temperature of the battery; the sensor component transmits the voltage signal, the temperature signal and the current signal detected by the sensor component to a programmable controller or an expansion module thereof;
the programmable controller is configured to:
within a time range allowing a generator power supply to be started, calculating the power generation power of all photovoltaic cell panels according to the voltage signals of the photovoltaic voltage sensors and the current signals of the photovoltaic current sensors, judging that the power generation power is smaller than a set power generation amount, and sending an oil engine starting signal to the generator power supply when the voltage signals of the battery pack voltage sensors are smaller than a set voltage;
when the current signal of the battery pack current sensor is judged to be smaller than the set current within the time range allowing the generator power supply to be started, an oil engine stop signal is sent to the generator power supply after a set time is delayed;
sending an oil engine stop signal to a generator power supply outside a time range for setting permission of starting the generator power supply;
the monitoring host machine also receives, stores and displays the voltage signal, the temperature signal and the current signal through the programmable controller.
According to the technical scheme provided by the embodiment of the application, the monitoring host is provided with 2 background communication serial ports which are respectively used for connecting a local monitoring background and a remote monitoring background;
in the solar photovoltaic power generation system: the battery pack is provided with a battery pack switch and a battery pack fuse; an insulation relay for detecting the insulation state of the direct current bus is arranged in the power generation system;
the programmable controller is also configured to receive a battery pack switch state signal of the battery pack switch, a state signal of the battery pack fuse and a state signal of the insulating relay, and send an alarm signal to the monitoring host when the battery pack switch state signal is not closed or the state signal of the battery pack fuse is a fault signal or the state signal of the insulating relay is a fault signal;
the monitoring host is configured to: and storing the alarm signal after receiving the alarm signal, starting the alarm module to alarm, and then sending a comprehensive fault alarm signal to the local monitoring background.
According to the technical scheme provided by the embodiment of the application, the photovoltaic inverter sends the state signal of the inverter to the monitoring host through the serial bus for storage and display.
According to the technical scheme provided by the embodiment of the application, the battery inspection module is configured to detect the voltage signal of a single battery in the battery pack, convert the voltage signal into a digital signal and transmit the digital signal to the programmable controller through a serial RS485 bus.
According to the technical scheme provided by the embodiment of the application, the monitoring host is provided with a parameter setting module; the set voltage, the set current, the set power generation amount, the set duration and the set time range allowing the generator power supply to be started are set through the parameter setting module;
the parameter setting module is configured to input a charging current upper limit value, a temperature upper limit value, an overvoltage value and an undervoltage value of the battery pack through the touch screen, the overvoltage value and the undervoltage value of a single battery in the battery pack, the lighting time of the touch screen and the alarm time of the alarm module; the monitoring host determines whether to start the alarm module to alarm or not according to the voltage signal, the temperature signal and the current signal detected by the sensor assembly and each parameter set by the parameter setting module and sends a comprehensive fault alarm signal to a local monitoring background;
the parameter setting module is also configured to input the working time period of the load power supply module; the monitoring host is configured to send a load power supply module starting command meeting the requirement of the working time period to the programmable control module; and enabling the load power supply module to work in the working time period.
According to the technical scheme provided by the embodiment of the application, the monitoring host is a tablet computer.
According to the technical scheme provided by the embodiment of the application, the programmable controller is a 6ES7 module; the expansion module is an EM231 module.
According to the technical scheme provided by the embodiment of the application, the protection device for placing the tablet personal computer is further included, the protection device comprises a base with an open side edge, and a placing cavity for placing the tablet personal computer is formed in the middle of the base; the placing cavity is an inclined cavity with an opening higher than the bottom surface; a U-shaped mounting plate for clamping the tablet personal computer is placed in the placing cavity; a pull rod extending out of the base is arranged on one side, away from the tablet personal computer, of the mounting plate;
a primary sealing plate is inserted into the middle part of the placing cavity in a vertically sliding manner; a secondary sealing plate is hinged to the top end of the opening of the placing cavity; a pull rope is fixed at the outer end of the primary sealing plate, and a pin is fixed at the end part of the pull rope; the outer side of the secondary sealing plate is provided with a jack for inserting the pin;
the external wiring of the tablet personal computer extends out through the side edge of the base; the side of the base corresponds to the side key of the tablet computer and is correspondingly inserted with an insertion block.
According to the technical scheme provided by the embodiment of the application, scrapers are arranged on two sides of the primary sealing plate outside the base; and a flexible layer is adhered to the outer side of the scraper.
The application has the advantages and positive effects that: the technical scheme is adopted, namely the output voltage of a photovoltaic cell panel, the output voltage of an inverter, the output voltage of a battery pack and the output voltage of a load power supply in the solar photovoltaic power generation system are monitored through a monitoring host and a programmable controller; parameters such as the working environment temperature of the battery pack and the like are displayed on the touch screen, so that the working state of each module in the solar photovoltaic power generation system can be mastered in time, faults can be found in time, and the normal operation of the solar energy optical method power generation system is guaranteed; the monitoring system provided by the application can selectively start the power supply of the generator according to the generated energy of the photovoltaic cell panel timely and automatically, so that the normal work of the battery pack is ensured, and the normal operation of load equipment is ensured.
According to the technical scheme provided by the embodiment of the application, faults in the power generation system are found in time and an alarm signal is sent out by receiving the battery pack switch state signal of the battery pack switch, the state signal of the battery pack fuse and the state signal of the insulating relay in the photovoltaic power generation system, so that the normal operation of the photovoltaic power generation system is guaranteed.
According to the technical scheme provided by the embodiment of the application, the monitoring host is further provided with a parameter setting module and an alarm module corresponding to each module in the solar photovoltaic power generation system, so that after the voltage signal, the current signal and the temperature signal of each module are monitored, the monitored voltage signal, the current signal and the temperature signal can be compared with the set parameters, and the alarm module is started in time according to the comparison result.
According to the technical scheme provided by the embodiment of the application, the base is arranged on the tablet personal computer, the placing cavity for preventing the tablet personal computer is arranged in the base, and the placing cavity is provided with the double sealing plates; therefore, the working environment of the tablet computer can be guaranteed in a severe environment, and the phenomenon that excessive dust and sand enter the tablet computer to affect the work of the tablet computer is avoided.
In addition to the technical problems addressed by the present application, the technical features constituting the technical solutions, and the advantages brought by the technical features of the technical solutions described above, other technical problems solved by the solar photovoltaic power monitoring system of the present application, other technical features included in the technical solutions, and advantages brought by the technical features will be further described in detail with reference to the accompanying drawings.
Drawings
FIG. 1 is a functional block diagram of a solar photovoltaic power generation system of the present application;
FIG. 2 is a functional block diagram of a solar photovoltaic power monitoring system of the present application;
FIG. 3 is a circuit diagram of the solar photovoltaic power monitoring system of the present application;
FIG. 4 is an enlarged view of portion A of FIG. 3;
FIG. 5 is an enlarged view of portion B of FIG. 3;
fig. 6 to 7 are schematic structural views of the base in embodiment 2.
In the figure: 10 solar photovoltaic power generation system; 11 a photovoltaic cell panel; 12 a photovoltaic inverter; 13 a battery pack; 13-1, a battery pack switch; 13-2 battery pack fuses; 14 a load power supply module; 15 load; 16 a generator power supply; 17 an emergency charging module; 18 an insulated relay; 21 monitoring the host computer; 22 a programmable controller; 26. a background is monitored remotely; 23 monitoring the power supply module; 24 an expansion module; 27 a battery inspection module; 25 local monitoring background; 34 a temperature sensor; 35 a current sensor; 36 a photovoltaic current sensor; 40 a protection device; 41 a base; 42 a placement cavity; 43 mounting a plate; 43-1, a pull rod is first level; 44 a sealing plate; 46 pulling a rope; 47 pins; 45 secondary sealing plates; 48 jacks; 49 scraper.
Detailed Description
The following further describes embodiments of the present application with reference to the drawings. It should be noted that the description of the embodiments is provided to help understanding of the present application, but the present application is not limited thereto. In addition, the technical features mentioned in the embodiments of the present application described below may be combined with each other as long as they do not conflict with each other.
Example 1
The embodiment provides a solar photovoltaic power supply monitoring system, which is used for monitoring a solar photovoltaic power generation system; as shown in fig. 1, the solar photovoltaic power generation system 10 includes a plurality of photovoltaic cell panels 11, a photovoltaic inverter 12 corresponding to each photovoltaic cell panel 11, and a battery pack 13, wherein the battery pack 13 is composed of a plurality of individual cells; the photovoltaic inverter 12 is used for converting a power supply of the photovoltaic cell panel 11 into direct current and then charging the battery pack 13; the battery pack 13 and/or the photovoltaic inverter 12 are used for supplying power to a load 15 through a load power module 14; in this embodiment, the solar photovoltaic power generation system 10 further includes a module for charging the battery pack 13 through the generator power supply 16 and the emergency charging module 17 for emergency use. The generator power source 16 may be a diesel generator or a gasoline generator.
In this embodiment, the load power module 14 is a voltage stabilizing module, which converts the dc power inverted by the photovoltaic inverter 12 or the power of the battery pack 13 into a stable dc power, generally 24V or 48V, and provides the stable dc power to the communication device of the user, generally, the load power module 14 converts the power of the battery pack 13 into a stable dc communication power, because the dc power voltages output by the power of the battery pack 13 and the photovoltaic inverter 12 are unstable, a load power module 14 is required to perform voltage conversion and stabilize the voltage to provide the communication device of the user, and the communication device is generally a carrier, an optical transceiver, an RPRS module, and the like for remote communication.
As shown in fig. 2, the solar photovoltaic power monitoring system 20 provided in this embodiment includes a monitoring host 21, a programmable controller 22 in signal connection with the monitoring host 21, a sensor assembly 30, and a monitoring power module 23; the monitoring host 21 is provided with a touch screen and an alarm module; the programmable controller 22 is connected with an expansion module 24 through a parallel bus;
the sensor assembly 30 comprises a photovoltaic voltage sensor 31/photovoltaic current sensor 36 for detecting the output voltage/current of the photovoltaic cell panel 11, a battery pack voltage sensor 32 for detecting the working voltage of the battery pack 13, a load voltage sensor 33/battery pack current sensor 35 for detecting the output voltage/current of the load power supply module 14, and a temperature sensor 34 for detecting the ambient temperature of the battery; the sensor assembly 30 transmits the voltage signal, the temperature signal and the current signal detected by the sensor assembly to the programmable controller 22 or the expansion module 24 thereof;
the programmable controller 22 is configured to:
within a time range allowing the generator power supply to be started, calculating the power generation power of all photovoltaic cell panels according to the voltage signal of the photovoltaic voltage sensor 31 and the current signal of the photovoltaic current sensor 36, and when the power generation power is judged to be smaller than a set power generation amount and the voltage signal of the battery pack voltage sensor 32 is smaller than a set voltage, sending an oil engine starting signal to the generator power supply 16 to timely and emergently charge the battery pack 13;
when the current signal of the battery pack current sensor 35 is judged to be smaller than the set current within the time range of setting permission for starting the generator power supply, an oil engine stop signal is sent to the generator power supply 16 after a set time is delayed;
sending an oil engine stop signal to the generator power supply 16 outside a time range set to allow starting of the generator power supply;
the parameters of the time range of the power supply of the generator allowed to be started, the set power generation amount, the set time length, the set current and the set voltage are set in the monitoring host 10, and the monitoring host sets the programmable controller through the network port. Data transmission between the monitoring host 10 and the programmable controller 22 may be implemented through an ethernet interface or through a serial interface.
The photovoltaic inverter 12 sends an inverter output state signal to the monitoring host 21 through a serial bus; therefore, the monitoring host 21 can also conveniently detect the monitoring operation parameters and the fault state of the photovoltaic inverter 12; the status signals include signals of output voltage, current, frequency, power, temperature, etc. of the photovoltaic inverter 12.
The monitoring host 21 receives the voltage signal, the temperature signal and the current signal through the programmable controller 22, processes the signals and displays the processed signals on a touch screen; in this embodiment, the serial bus is an RS485 bus. In the monitoring system, the touch screen is a touch display screen, the monitoring host 21 is provided with a plurality of display interfaces, for example, by receiving and storing the output voltage of each photovoltaic cell panel, tabular data or curve data of the output voltage and the power generation amount of each photovoltaic cell panel in each time period is obtained through calculation; for example, by receiving the output voltage of the battery pack 13 and the ambient temperature of the battery pack, the voltage and the ambient temperature of the battery pack can be plotted as a curve or a table according to time variation, so as to facilitate checking the operation condition of the whole solar photovoltaic system.
The monitoring power module 23 is configured to supply power to the monitoring host 21, the programmable controller 22, the sensor assembly 30, and the expansion module 24. In this embodiment, the output voltage of the monitoring power module 23 is a 24V dc power supply.
The monitoring host is provided with 2 background communication serial ports which are respectively used for connecting a local monitoring background 25 and a remote monitoring background 26; the monitoring host 10 can respectively set the communication parameters of the two communication serial ports;
in the solar photovoltaic power generation system: the battery pack 13 is provided with a battery pack switch 13-1 and a battery pack fuse 13-2; an insulation relay 18 for detecting the insulation state of the direct current bus is arranged in the solar photovoltaic power generation system;
the programmable controller 22 is further configured to receive a battery pack switch state signal of the battery pack switch 13-1, a state signal of the battery pack fuse 13-2 and a state signal of the insulating relay 18, and send an alarm signal to the monitoring host 10 when receiving that the battery pack switch state signal is not closed or the state signal of the battery pack fuse is a fault signal or the state signal of the insulating relay is a fault signal;
the programmable controller 22 is configured to: and storing the alarm signal after receiving the alarm signal, starting the alarm module to alarm, and then sending a comprehensive fault alarm signal to the local monitoring background 25.
The alarm module is for example a buzzer; when any one signal is generated, the power generation system is indicated to have a fault and needs to be overhauled immediately; the system can find the faults and give an alarm in time, and the safety of the system is guaranteed.
The monitoring system further includes a battery polling module 27 configured to detect a voltage signal of a single battery in the battery pack, convert the voltage signal into a digital signal, and transmit the digital signal to the programmable controller 22 through a serial RS485 bus.
The monitoring host 21 sends a comprehensive fault alarm signal to the local monitoring background, and communicates with the local monitoring background 25 and the remote monitoring background 26 through the following communication protocols:
the communication mode between the monitoring host 21 and the local monitoring background 25 and the remote monitoring background 26 can adopt any one of COM, RS232 and RS485, the baud rate is 9600, the character format adopts an asynchronous serial communication format without check bits, 8-bit data bits and 1-bit stop bits, the master-slave communication structure is adopted, and the station number is 1/2 in a default mode and can be set.
And after the monitoring host sends the command, if the return data is not received, waiting for sending a new data packet by more than 500 mS. The monitoring host sends commands in a circulating mode, and the monitoring host does not receive data and has communication faults after 5 continuous cycles.
1. Remote measuring data acquisition (01H)
Command:
| address | Function code | STARTADDR | Data length | CRC checking |
| 01H | 03H | 0000H | 000CH | CRC16 |
And returning:
| address | Function code | Length of | DATA | CRC checking |
| 01H | 03H | 18H | CRC16 |
Data definition:
the floating-point double-word register is arranged in the sequence that a high word is in front of a low word;
description of remote signaling:
in the above communication protocol, the batteries 01 to 24 refer to batteries 01 to 24 in the battery pack, respectively; the photovoltaic 1-the photovoltaic 3 refer to a photovoltaic cell panel 1-a photovoltaic cell panel 3, respectively;
in this embodiment, the programmable controller may be, for example, a 6ES7 module or other programmable controller; the expansion module may be, for example, an EM231 module.
According to the technical scheme provided by the embodiment of the application, the monitoring host is provided with a parameter setting module; the set voltage, the set current, the set power generation amount, the set duration and the set time range allowing the generator power supply to be started are set through the parameter setting module;
the parameter setting module is configured to input a charging current upper limit value, a temperature upper limit value, an overvoltage value and an undervoltage value of the battery pack through the touch screen, the overvoltage value and the undervoltage value of a single battery in the battery pack, the lighting time of the touch screen and the alarm time of the alarm module; and the monitoring host determines whether to start the alarm module to alarm or not according to the voltage signal, the temperature signal and the current signal detected by the sensor assembly and each parameter set by the parameter setting module, and sends a comprehensive fault alarm signal to a local monitoring background.
For example, when the signal of the battery pack voltage sensor 32 shows that the voltage exceeds the overvoltage value of the battery pack, the alarm module sends out an overvoltage alarm; when the signal display voltage of the battery pack voltage sensor 32 is smaller than the undervoltage value of the battery pack, the alarm module gives out undervoltage alarm; when the signal of the current sensor 35 shows that the current exceeds the current upper limit value of the battery pack, the alarm module sends out current upper limit alarm; when the signal of the temperature sensor 34 shows that the current exceeds the upper temperature limit value of the battery pack, the alarm module sends out an upper temperature limit alarm; when any one of the above alarm signals is generated, the monitoring host 10 stores and records the detailed information of the alarm signal; and meanwhile, sending a comprehensive fault alarm signal to a local monitoring background.
The buzzer is started according to set alarm duration when each alarm is generated, and the alarm is stopped after the alarm duration is up until the buzzer is started again when the next alarm signal is generated.
Example 2
Based on embodiment 1, as shown in fig. 3, the monitoring system provided by this embodiment further includes a protection device 40 for placing the tablet computer (i.e., the monitoring host 21), where the protection device 40 includes a base 41 with an open side, and a placing cavity 42 for placing the tablet computer (i.e., the monitoring host 21) is formed in the middle of the base 41; the placing cavity 42 is an inclined cavity with an opening higher than the bottom surface; a U-shaped mounting plate 43 used for clamping the tablet personal computer is placed in the placing cavity; a pull rod 43-1 extending out of the base is arranged on one side, away from the tablet personal computer, of the mounting plate 43;
a primary sealing plate 44 is inserted into the middle of the placing cavity 42 in a vertically sliding manner; the top end of the opening of the placing cavity is hinged with a secondary sealing plate 45; a pull rope 46 is fixed at the outer end of the primary sealing plate 44, and a pin 47 is fixed at the end part of the pull rope 46; the outer side of the secondary sealing plate 45 is provided with an insertion hole 48 for inserting the pin 47;
external wiring of the tablet personal computer extends out through the side edge of the base, such as power lines and data lines, and optionally the lines have enough expansion amount in the placing cavity, so that the tablet personal computer is prevented from being pulled during moving; the side edge of the base 41 corresponds to the side edge key of the tablet computer and is also correspondingly inserted with an insertion block, and the control of the side key of the tablet computer can be realized by pressing the insertion block.
Since the tablet personal computer is a precise electronic device, when the tablet personal computer works outdoors for a long time, the tablet personal computer is easily damaged by dust and sand, but in the embodiment, the tablet personal computer is hidden in the base 41, as shown in fig. 4, when the tablet personal computer needs to be checked and used, the primary sealing plate 44 is firstly pulled out, then the pull rod 44 pushes the tablet personal computer to the opening of the placing cavity 42, the secondary sealing plate 45 is lifted at the moment, and the pull rope 46 and the pin 47 are inserted into the insertion hole 48 to fix the primary sealing plate 44 and the secondary sealing plate; and then operating the tablet computer.
Preferably, scrapers 49 are arranged on two sides of the primary sealing plate 44 outside the base 41; a flexible layer is adhered to the outer side of the scraper 49; the scraper 49 can wipe off dust on the surface of the primary seal plate 44 when it is inserted.
The embodiments of the present application are described in detail above with reference to the drawings, but the present application is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made herein without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims.
Claims (9)
1. A solar photovoltaic power supply monitoring system is used for monitoring a solar photovoltaic power generation system; the solar photovoltaic power generation system comprises a plurality of photovoltaic cell panels, photovoltaic inverters corresponding to the photovoltaic cell panels and battery packs; the photovoltaic inverter is used for converting a power supply of a photovoltaic cell panel into direct current and then charging the battery pack; the battery pack and/or the photovoltaic inverter are used for supplying power to a load through the load power supply module; the emergency charging system further comprises a generator power supply, wherein the generator power supply is used for charging the battery pack through an emergency charging module in emergency;
the monitoring system is characterized by comprising a monitoring host, a programmable controller in signal connection with the monitoring host, a sensor assembly and a monitoring power module; the monitoring host is provided with a touch screen and an alarm module; the programmable controller is connected with an expansion module through a parallel bus; the monitoring power supply module is configured to supply power to the monitoring host, the sensor assembly, the programmable controller and the expansion module;
the sensor assembly comprises a photovoltaic voltage sensor for detecting the output voltage of the photovoltaic cell panel, a photovoltaic current sensor for detecting the output current of the photovoltaic cell panel, a battery pack voltage sensor for detecting the working voltage of the battery pack, a battery pack current sensor for detecting the working current of the battery pack, a load voltage sensor for detecting the output voltage of the load power supply module, a load current sensor for detecting the output current of the load power supply module and a temperature sensor for detecting the ambient temperature of the battery; the sensor component transmits the voltage signal, the temperature signal and the current signal detected by the sensor component to a programmable controller or an expansion module thereof;
the programmable controller is configured to:
within a time range allowing a generator power supply to be started, calculating the power generation power of all photovoltaic cell panels according to the voltage signals of the photovoltaic voltage sensors and the current signals of the photovoltaic current sensors, judging that the power generation power is smaller than a set power generation amount, and sending an oil engine starting signal to the generator power supply when the voltage signals of the battery pack voltage sensors are smaller than a set voltage;
when the current signal of the battery pack current sensor is judged to be smaller than the set current within the time range allowing the generator power supply to be started, an oil engine stop signal is sent to the generator power supply after a set time is delayed;
sending an oil engine stop signal to a generator power supply outside a time range for setting permission of starting the generator power supply;
the monitoring host machine also receives, stores and displays the voltage signal, the temperature signal and the current signal through the programmable controller.
2. The solar photovoltaic power monitoring system of claim 1, wherein the monitoring host has 2 background communication serial ports for connecting a local monitoring background and a remote monitoring background, respectively;
in the solar photovoltaic power generation system: the battery pack is provided with a battery pack switch and a battery pack fuse; an insulation relay for detecting the insulation state of the direct current bus is arranged in the power generation system;
the programmable controller is also configured to receive a battery pack switch state signal of the battery pack switch, a state signal of the battery pack fuse and a state signal of the insulating relay, and send an alarm signal to the monitoring host when the battery pack switch state signal is not closed or the state signal of the battery pack fuse is a fault signal or the state signal of the insulating relay is a fault signal;
the monitoring host is configured to: and storing the alarm signal after receiving the alarm signal, starting the alarm module to alarm, and then sending a comprehensive fault alarm signal to the local monitoring background.
3. The solar photovoltaic power monitoring system of claim 2, wherein the photovoltaic inverter sends the inverter status signal to the monitoring host via a serial bus for storage and display.
4. The solar photovoltaic power monitoring system of claim 3, further comprising a battery polling module configured to detect voltage signals of individual batteries in the battery pack, convert the voltage signals into digital signals, and transmit the digital signals to the programmable controller through a serial RS485 bus.
5. The solar photovoltaic power supply monitoring system of claim 4, wherein the monitoring host is provided with a parameter setting module; the set voltage, the set current, the set power generation amount, the set duration and the set time range allowing the generator power supply to be started are set through the parameter setting module;
the parameter setting module is also configured to input a charging current upper limit value, a temperature upper limit value, an overvoltage value and an undervoltage value of the battery pack through the touch screen, the overvoltage value and the undervoltage value of a single battery in the battery pack, the lighting time of the touch screen and the alarm time of the alarm module; the monitoring host determines whether to start the alarm module to alarm or not according to the voltage signal, the temperature signal and the current signal detected by the sensor assembly and each parameter set by the parameter setting module and sends a comprehensive fault alarm signal to a local monitoring background;
the parameter setting module is also configured to input the working time period of the load power supply module; the monitoring host is configured to send a load power supply module starting command meeting the requirement of the working time period to the programmable control module; and enabling the load power supply module to work in the working time period.
6. The solar photovoltaic power monitoring system of claim 5, wherein the monitoring host is a tablet computer.
7. The solar photovoltaic power supply monitoring system of claim 6, wherein the programmable controller is a 6ES7 module; the expansion module is an EM231 module.
8. The solar photovoltaic power supply monitoring system according to claim 7, further comprising a protection device for placing the tablet computer, wherein the protection device comprises a base with an open side, and a placing cavity for placing the tablet computer is formed in the middle of the base; the placing cavity is an inclined cavity with an opening higher than the bottom surface; a U-shaped mounting plate for clamping the tablet personal computer is placed in the placing cavity; a pull rod extending out of the base is arranged on one side, away from the tablet personal computer, of the mounting plate;
a primary sealing plate is inserted into the middle part of the placing cavity in a vertically sliding manner; a secondary sealing plate is hinged to the top end of the opening of the placing cavity; a pull rope is fixed at the outer end of the primary sealing plate, and a pin is fixed at the end part of the pull rope; the outer side of the secondary sealing plate is provided with a jack for inserting the pin;
the external wiring of the tablet personal computer extends out through the side edge of the base; the side of the base corresponds to the side key of the tablet computer and is correspondingly inserted with an insertion block.
9. The solar photovoltaic power supply monitoring system of claim 8, wherein scrapers are arranged on two sides of the primary sealing plate outside the base; and a flexible layer is adhered to the outer side of the scraper.
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