CN109039276A - A kind of portable on-line fault diagnosis device in photovoltaic off-grid power station - Google Patents

A kind of portable on-line fault diagnosis device in photovoltaic off-grid power station Download PDF

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Publication number
CN109039276A
CN109039276A CN201810676080.0A CN201810676080A CN109039276A CN 109039276 A CN109039276 A CN 109039276A CN 201810676080 A CN201810676080 A CN 201810676080A CN 109039276 A CN109039276 A CN 109039276A
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China
Prior art keywords
circuit
resistance
feet
signal
capacitor
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CN201810676080.0A
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Chinese (zh)
Inventor
赵婷婷
李潇潇
夏之秋
刘莹
王春鹏
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Shenyang Institute of Engineering
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Shenyang Institute of Engineering
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Priority to CN201810676080.0A priority Critical patent/CN109039276A/en
Publication of CN109039276A publication Critical patent/CN109039276A/en
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02SGENERATION OF ELECTRIC POWER BY CONVERSION OF INFRA-RED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S50/00Monitoring or testing of PV systems, e.g. load balancing or fault identification
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/0006Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network for single frequency AC networks
    • H02J13/0013Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network for single frequency AC networks characterised by transmission structure between the control or monitoring unit and the controlled or monitored unit
    • H02J13/0017Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network for single frequency AC networks characterised by transmission structure between the control or monitoring unit and the controlled or monitored unit with direct transmission between the control or monitoring unit and the controlled or monitored unit
    • H02J13/0075Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network for single frequency AC networks characterised by transmission structure between the control or monitoring unit and the controlled or monitored unit with direct transmission between the control or monitoring unit and the controlled or monitored unit using radio means
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/7853
    • YGENERAL 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
    • Y04INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04SSYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00Systems supporting electrical power generation, transmission or distribution
    • Y04S10/40Display of information, e.g. of data or controls
    • YGENERAL 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
    • Y04INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04SSYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S40/00Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
    • Y04S40/12Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
    • Y04S40/126Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wireless data transmission

Abstract

A kind of portable on-line fault diagnosis device in photovoltaic off-grid power station belongs to the portable on-line fault diagnosis device of solar photovoltaic technology field more particularly to a kind of photovoltaic off-grid power station.The present invention provides a kind of portable on-line fault diagnosis device in photovoltaic off-grid power station.The present invention includes current signal detection circuit, voltage signal detection circuit, accumulator body and ambient temperature detection circuit, irradiation intensity detection circuit, remote radio communication circuit, keyboard circuit, LCD display circuit and master cpu circuit, the signal output port of its structural feature current signal detection circuit is connected with the signal input port of master cpu circuit, the signal output port of voltage signal detection circuit is connected with the signal input port of master cpu circuit, accumulator body is connected with the signal output port of ambient temperature detection circuit with the signal input port of master cpu circuit.

Description

A kind of portable on-line fault diagnosis device in photovoltaic off-grid power station
Technical field
The invention patent belong to solar photovoltaic technology field more particularly to a kind of photovoltaic off-grid power station it is portable Line fault diagnosis device.
Background technique
Photovoltaic off-grid power station is independently operated photovoltaic generating system, it does not have any interface with public electric wire net, belong to hair, It stores up, for the electricity generation system of one.Its basic functional principle is that photovoltaic module produces electricl energy under sunlight irradiation, and electric energy passes through The supply load of off-network controller, and extra electric energy is stored into battery, in illumination deficiency or night in battery Electric energy continues powering load by off-network controller.Photovoltaic off-grid power plant scale is smaller, is suitble to distribution construction, on island, sand The area that the remote districts such as desert, gobi or connection public electric wire net are had any problem, photovoltaic off-grid power station is a kind of preferable power supply mode. In addition to battery, design service life is generally 25 years in photovoltaic off-grid power station.Service lifetime of accumulator according to the type of battery, Reasons, the service life such as quality, use environment, the matching of system charge-discharge parameter are generally differed between 5 ~ 8 years.Due to photovoltaic off-grid system The reasons such as structure is complicated for system, and buying equipment quality is different, and construction quality is irregular influence, and photovoltaic off-grid power station is in one section of operation It will appear various problems or failure, including component damage, wire break, the damage of off-network controller, battery after time because of salinization Etc. the decline of performance caused by reasons etc..Since photovoltaic off-grid power station is usually built in area that is remote, having inconvenient traffic, so maintenance Detection needs to expend a large amount of human and material resources and time, often because minor issue needs to pay high maintenance cost, deviates from hair The original intention of exhibition and construction photovoltaic off-grid power station.With the development construction in photovoltaic off-grid power station, how photovoltaic off-grid power station is carried out Fault diagnosis becomes an extremely important problem.And still lacks mature effective photovoltaic off-grid Accident Diagnosis of Power Plant at present and set It is standby, failure diagnosis apparatus especially portable and with wireless communication capability.
Summary of the invention
The present invention addresses the above problem, provides a kind of portable on-line fault diagnosis device in photovoltaic off-grid power station.
To achieve the above object, the present invention adopts the following technical scheme that, the present invention includes current signal detection circuit, voltage Signal deteching circuit, accumulator body and ambient temperature detection circuit, irradiation intensity detection circuit, remote radio communication circuit, Keyboard circuit, LCD display circuit and master cpu circuit, the signal output port of structural feature current signal detection circuit It is connected with the signal input port of master cpu circuit, signal output port and the master cpu circuit of voltage signal detection circuit Signal input port is connected, the signal output port of accumulator body and ambient temperature detection circuit and the letter of master cpu circuit Number input port is connected, and the signal output port of irradiation intensity detection circuit is connected with the signal input port of master cpu circuit, The signal input port of remote radio communication circuit is connected with the signal output port of master cpu circuit, the control of keyboard circuit Signal output port is connected with the control signal input mouth of master cpu circuit, the signal transmission port point of LCD display circuit It is not connected with the signal transmission port of master cpu circuit, the signal transmission port of LCD liquid crystal display screen;The keyboard circuit Control signal input mouth is connected with the control signal output mouth of keyboard.
As a preferred embodiment, current signal detection circuit of the present invention be will be in route by jaw type current probe Electric current proportion sample, the analog signal sampled passes through the AD conversion inside master cpu after voltage follower circuit Module becomes digital signal;
The voltage signal detection circuit is to be taken the voltage in route in proportion by Hall sensor by voltage tester probe Sample, the analog signal sampled become digital letter by the AD conversion module inside master cpu after signal conditioning circuit Number;
The accumulator body and ambient temperature detection circuit are to detect electric power storage by the temperature sensor of temperature detection chip interior The temperature of pond ontology and local environment, and temperature signal is become into digital signal by the analog-digital converter inside detection chip;
The irradiation intensity detection circuit is strong by the light intensity sensor detection ambient irradiation inside irradiation intensity detection chip Analog signal is spent, and irradiation intensity analog signal is become into digital signal by the analog-digital converter inside detection chip;
The remote radio communication circuit is to be believed by wireless communication module by the serial communication interface read failure of master cpu Breath, and fault message is subjected to long distance wireless transmission by GPRS network.
As another preferred embodiment, the function of keyboard circuit and LCD display circuit of the present invention is setting failure The control parameter of diagnostor, including irradiation level threshold value, temperature threshold and inspection interval time, and checked online by LCD screen and be The historical data of the working condition of system and each parameter.
As another preferred embodiment, master cpu circuit of the present invention include system clock circuit, program downloading with Line artificial circuit, master cpu and power-switching circuit, master cpu port respectively with system clock circuit port, program downloading with In-circuit emulation circuit port is connected, and power-switching circuit is other chips for needing 3.3V power supply power supply in master cpu and circuit Power supply.
As another preferred embodiment, master cpu of the present invention acquires various physical quantity signals, to signal synthesis point Analysis carries out fault diagnosis, sends to diagnostic result long distance wireless.
As another preferred embodiment, master cpu of the present invention uses PIC18F6720 chip U1.
As another preferred embodiment, system clock circuit of the present invention includes capacitor C5, capacitor C6, crystal oscillator X1, crystalline substance Vibration one end X1 is connected with 39 feet of the one end capacitor C5, U1 respectively, and the capacitor C5 other end is connected with ground wire, the one end capacitor C6 respectively, The capacitor C6 other end is connected with 40 feet of the crystal oscillator X1 other end, U1 respectively.
As another preferred embodiment, capacitor C5, C6 of the present invention use 18pF capacitor, and crystal oscillator X1 is brilliant using 20MHz Vibration.
As another preferred embodiment, program downloading of the present invention and in-circuit emulation circuit include diode D1, resistance R1, resistance R2, capacitor C7, plug receptacle J2, the one end resistance R1 are connected with power supply VCC3.3V, diode D1 cathode respectively, resistance R1 The other end is connected with the one end capacitor C7, diode D1 anode, the one end resistance R2 respectively, capacitor C7 other end ground connection, and resistance R2 is another One end is connected with 1 foot of plug receptacle J2 respectively, 7 feet of U1 are connected, 2 feet of plug receptacle J2 respectively with power supply VCC3.3V, J2 6 Foot is connected, and the 3 feet ground connection of plug receptacle J2,4 feet of plug receptacle J2 are connected with 37 feet of U1,5 feet of plug receptacle J2 and 42 feet of U1 It is connected.
As another preferred embodiment, resistance R1 of the present invention uses 10K Ohmic resistance, and resistance R2 is using 1K ohm of electricity Resistance, diode D1 use 1N4148 type diode, and capacitor C7 uses 0.1 μ F capacitor.
As another preferred embodiment, power-switching circuit of the present invention include electrolytic capacitor C1 and C4, capacitor C2 and C3, power conversion chip U2, plug receptacle J1, electrolytic capacitor C1 anode respectively with power supply VCC5V, the one end capacitor C2, U2 3 Foot, plug receptacle J1 1 foot be connected, the cathode of electrolytic capacitor C1 respectively with the capacitor C2 other end, 1 foot of U2, the one end capacitor C3, electricity 2 feet of the cathode, plug receptacle J1 that solve capacitor C4 are connected, the 1 foot ground connection of U2, and the anode of electrolytic capacitor C4 is another with capacitor C3 respectively End, 2 feet of U2, power supply VCC3.3V are connected, and 3 feet of plug receptacle J1 are connected with power supply -15V, and 4 feet of plug receptacle J1 and power supply+ 15V is connected.
As another preferred embodiment, capacitor C1, C4 of the present invention use 10 μ F electrolytic capacitors, and capacitor C2, C3 are used 0.1 μ F capacitor, power conversion chip use AMS1117-3.3.
As another preferred embodiment, keyboard circuit of the present invention includes exclusion RA1, resistance R3~R7, plug receptacle J3, 60~64 feet of 1~5 foot of plug receptacle J3 respectively with 2~6 feet of exclusion RA1, U1 are correspondingly connected with, and 6 feet of plug receptacle J3 pass through Resistance R3 is connected with 12 feet of U1, and 7 feet of plug receptacle J3 are connected by resistance R4 with 13 feet of U1, and 8 feet of plug receptacle J3 pass through Resistance R5 is connected with 14 feet of U1, and 9 feet of plug receptacle J3 are connected by resistance R6 with 15 feet of U1, and 10 feet of plug receptacle J3 pass through Resistance R7 is connected with 16 feet of U1, and 1 foot of exclusion RA1 is connected with power supply VCC3.3V.
As another preferred embodiment, resistance R3~R7 of the present invention uses 20 Ohmic resistances, and exclusion RA1 uses 1K*5 Exclusion.
As another preferred embodiment, LCD display circuit of the present invention includes resistance R8~R11, NPN triode Q1,12~18 feet of liquid crystal display U3, U3 are corresponding with 49~55 feet of U1 connected respectively, 33 foot phases of 19 feet and U1 of U3 Even, 20 feet of U3 are connected with 4 feet of the one end resistance R10, U3 respectively by resistance R11, the resistance R10 other end respectively with power supply 3 feet of VCC3.3V, U3 are connected;
21 feet of U3 are connected with the emitter of NPN triode Q1, the collector of NPN triode Q1 respectively with power supply VCC3.3V, electricity It hinders the one end R8 to be connected, the resistance R8 other end is connected with 36 feet of the one end resistance R9, U1 respectively, the resistance R9 other end and tri- pole NPN The base stage of pipe Q1 is connected;
22,1,2 feet of U3 are grounded, and 11 feet of U3 are connected with 48 feet of U1, and 10 feet of U3 are connected with 47 feet of U1,5~8 feet of U3 It is correspondingly connected with respectively with 43~46 feet of U1.
As another preferred embodiment, resistance R8, R9 of the present invention use 820 Ohmic resistances, and resistance R10 uses 51K Ohmic resistance, resistance R11 use 6K Ohmic resistance, and NPN triode Q1 uses 9014 type triodes.
As another preferred embodiment, keyboard of the present invention uses 5 × 5 keyboard.
As another preferred embodiment, LCD liquid crystal display screen of the present invention uses the LCD liquid crystal of 240 × 64 pixels Display screen LM24064B.
As another preferred embodiment, irradiation intensity detection circuit of the present invention includes resistance R12 and R13, capacitor C8 With C9, irradiation intensity detection chip U4, plug receptacle J4, the one end capacitor C8 respectively with 1 foot of power supply VCC3.3V, U4, plug receptacle J4 4 feet be connected, the capacitor C8 other end is connected with 3 feet of 2 feet of U4,3 feet of U4, plug receptacle J4 respectively, 3 feet of U4 ground connection, electric Resistance one end R12 is connected with the one end resistance R13,5 feet of VCC3.3V, U4, the one end capacitor C9 respectively, the resistance R12 other end and U4's 6 feet, 34 feet of U1, plug receptacle J4 2 feet be connected, 4 feet of the resistance R13 other end and U4,35 feet of U1, plug receptacle J4 1 foot It is connected, capacitor C9 other end ground connection.
As another preferred embodiment, resistance R12, R13 of the present invention use 10K Ohmic resistance, and capacitor C8, C9 are used 0.1 μ F capacitor, irradiation intensity detection chip use BH1750FVI.
As another preferred embodiment, remote radio communication circuit of the present invention include remote wireless communication module U5, The one end capacitor C10, capacitor C10 is connected with 1 foot of power supply VCC5V, U5 respectively, the capacitor C10 other end respectively with ground wire, U5 2 Foot is connected, and the 3 feet ground connection of U5,4 feet of U5 are connected with 32 feet of U1, and 5 feet of U5 are connected with 31 feet of U1.
As another preferred embodiment, capacitor C10 of the present invention uses 0.1 μ F capacitor, remote wireless communication module U5 Using ATK-SIM800C.
As another preferred embodiment, current signal detection circuit of the present invention includes resistance R14 and R15, capacitor C11, zener diode D2, operational amplifier CA1, jaw type current probe M1, plug receptacle J5, M1 1 foot respectively with power supply+ 4 feet of 15V, J5 are connected, and 2 feet of M1 are connected with 3 feet of ground wire, J5 respectively, 3 feet of M1 2 foot phases with power supply -15V, J5 respectively Even, the 4 feet ground connection of M1,5 feet of M1 are connected with 1 foot of 1 foot of CA1, J5 respectively, and 5 feet of CA1 are connected with power supply+15V, CA1's 2 feet are connected with power supply -15V, and 3 feet of CA1 are connected with 4 feet of CA1, the one end resistance R14 respectively, the resistance R14 other end respectively with The one end capacitor C11, the one end resistance R15 be connected, the capacitor C11 other end ground connection, the resistance R15 other end respectively with zener diode D2 Cathode, U1 24 feet be connected, the plus earth of zener diode D2.
As another preferred embodiment, resistance R14, R15 of the present invention use 100K Ohmic resistance, and capacitor C11 is used 0.1 μ F capacitor, zener diode D2 use 1N4728 type zener diode, and operational amplifier CA1 uses LM321MFX.
As another preferred embodiment, jaw type current probe M1 of the present invention uses CHCS-LS08.
As another preferred embodiment, voltage signal detection circuit of the present invention includes resistance R16~R51, capacitor C12 ~C14, zener diode D3~D5, operational amplifier CA2~CA7, plug receptacle J6~J8, voltage transformer U6~U8, U6 1 Foot is connected by resistance R16 with 2 feet of plug receptacle J6, and 2 feet of U6 are connected with 1 foot of plug receptacle J6,3 feet and power supply -15V of U6 It is connected, 4 feet of U6 are connected with power supply+15V, and 5 feet of U6 are connected with the one end resistance R17, the one end resistance R18 respectively, and resistance R17 is another One end ground connection, the resistance R18 other end is connected with 3 feet of CA2, the one end resistance R19 respectively, 1 foot of CA2 respectively with resistance R20 mono- End, the one end resistance R21 are connected, and the resistance R20 other end is connected with ground wire, the resistance R21 other end respectively, and 5 feet of CA2 and power supply+ 15V is connected, and 2 feet of CA2 are connected with power supply -15V, and the resistance R19 other end is connected with 4 feet of CA2, the one end resistance R22 respectively, electricity Resistance the R22 other end be connected respectively with 3 feet of CA3, the one end resistance R23,1 foot of CA3 respectively with the one end resistance R24, resistance R25 mono- End is connected, and the resistance R24 other end is connected with ground wire, the resistance R25 other end respectively, and 5 feet of CA3 are connected with power supply+15V, CA3's 2 feet are connected with power supply -15V, and the resistance R23 other end is connected with 4 feet of CA3, the one end resistance R26 respectively, the resistance R26 other end point Be not connected with the one end resistance R27, the one end capacitor C12, the capacitor C12 other end ground connection, the resistance R27 other end respectively with U1 23 Foot, the cathode of zener diode D3 are connected, the plus earth of zener diode D3;
1 foot of U7 is connected by resistance R28 with 2 feet of plug receptacle J7, and 2 feet of U7 are connected with 1 foot of plug receptacle J7,3 feet of U7 Be connected with power supply -15V, 4 feet of U7 are connected with power supply+15V, 5 feet of U7 respectively with the one end resistance R29, the one end resistance R30 phase Even, resistance R29 other end ground connection, the resistance R30 other end are connected with 3 feet of CA4, the one end resistance R31 respectively, the 1 foot difference of CA4 It is connected with the one end resistance R32, the one end resistance R33, the resistance R32 other end is connected with ground wire, the resistance R33 other end respectively, CA4's 5 feet are connected with power supply+15V, and 2 feet of CA4 are connected with power supply -15V, the resistance R31 other end respectively with 4 feet of CA4, resistance R34 One end be connected, the resistance R34 other end is connected with 3 feet of CA5, the one end resistance R35 respectively, 1 foot of CA5 respectively with resistance R36 mono- End, the one end resistance R37 are connected, and the resistance R36 other end is connected with ground wire, the resistance R37 other end respectively, and 5 feet of CA5 and power supply+ 15V is connected, and 2 feet of CA5 are connected with power supply -15V, and the resistance R35 other end is connected with 4 feet of CA5, the one end resistance R38 respectively, electricity The resistance R38 other end is connected with the one end resistance R39, the one end capacitor C13 respectively, capacitor C13 other end ground connection, the resistance R39 other end It is connected respectively with the cathode of 22 feet of U1, zener diode D4, the plus earth of zener diode D4;
1 foot of U8 is connected by resistance R40 with 2 feet of plug receptacle J8, and 2 feet of U8 are connected with 1 foot of plug receptacle J8,3 feet of U8 Be connected with power supply -15V, 4 feet of U8 are connected with power supply+15V, 5 feet of U8 respectively with the one end resistance R41, the one end resistance R42 phase Even, resistance R41 other end ground connection, the resistance R42 other end are connected with 3 feet of CA6, the one end resistance R43 respectively, the 1 foot difference of CA6 It is connected with the one end resistance R44, the one end resistance R45, the resistance R44 other end is connected with ground wire, the resistance R45 other end respectively, CA6's 5 feet are connected with power supply+15V, and 2 feet of CA6 are connected with power supply -15V, the resistance R43 other end respectively with 4 feet of CA6, resistance R46 One end be connected, the resistance R46 other end is connected with 3 feet of CA7, the one end resistance R47 respectively, 1 foot of CA7 respectively with resistance R48 mono- End, the one end resistance R49 are connected, and the resistance R48 other end is connected with ground wire, the resistance R49 other end respectively, and 5 feet of CA7 and power supply+ 15V is connected, and 2 feet of CA7 are connected with power supply -15V, and the resistance R47 other end is connected with 4 feet of CA7, the one end resistance R50 respectively, electricity The resistance R50 other end is connected with the one end resistance R51, the one end capacitor C14 respectively, capacitor C14 other end ground connection, the resistance R51 other end It is connected respectively with the cathode of 21 feet of U1, zener diode D5, the plus earth of zener diode D5.
As another preferred embodiment, resistance R16, R28, R40 of the present invention are electric using 2 watts of power 3K ohm Resistance, resistance R17, R29, R41 use 120 Ohmic resistances, and resistance R18~R21, R30~R33, R42~R45 are using 20K ohm of electricity Resistance, resistance R22~R25, R34~R37, R46~R49 use 10K Ohmic resistance, resistance R26~R27, R38~R39, R50~ R51 uses 10K Ohmic resistance, and capacitor C12~C14 uses 0.1 μ F capacitor, and zener diode D3~D5 uses the pressure stabilizing of 1N4728 type Diode, operational amplifier CA2~CA7 use LM321MFX.
As another preferred embodiment, voltage transformer of the present invention uses HNV025A.
As another preferred embodiment, accumulator body of the present invention and ambient temperature detection circuit include resistance R52 ~R53, capacitor C15~C16, plug receptacle J9~J10, thermometric chip U9~U10, U9 3 feet respectively with the one end resistance R52, electricity Hold the one end C15, power supply VCC3.3V, plug receptacle J9 3 feet be connected, the resistance R52 other end respectively with 2 feet of U9, plug receptacle J9 1 foot, 27 feet of U1 are connected, and the capacitor C15 other end is connected with 2 feet of 1 foot of U9, ground wire, plug receptacle J9 respectively;
3 feet of U10 are connected with 3 feet of the one end resistance R53, the one end capacitor C16, power supply VCC3.3V, plug receptacle J10 respectively, resistance The R53 other end is connected with 28 feet of 2 feet of U10,1 foot of plug receptacle J10, U1 respectively, the capacitor C16 other end respectively with U10 1 Foot, ground wire, 2 feet of plug receptacle J10 are connected.
As another preferred embodiment, resistance R52~R53 of the present invention use 4.7K Ohmic resistance, capacitor C15~ C16 uses 0.1 μ F capacitor, and thermometric chip U9~U10 uses DS18B20 chip.
In addition, first using keyboard to set up initial parameter, including irradiation level threshold value F when the present invention starts to workth, temperature threshold Tth, inspection interval time, subsequently into cyclic program execute step in.Acquire various physical signals, including voltage signal, electric current Signal, irradiance signal, temperature signal.Judge whether system event occurs according to collected physical signal value and fault diagnosis table Barrier, if do not broken down, asks whether operator continues to diagnose for instructions, if agreed to, diagnostor enters inspection interval time etc. To which program returns start over circulation and executes after waiting, continues to diagnose if disagreed, and program execution terminates.If there is Failure then diagnoses failure, and shows fault message by LCD screen, whether that fault message is remote then asks operator for instructions Journey is sent, if agreed to, fault message will remotely be sent to monitoring center by GPRS network, if disagreed, will be skipped remote Journey sending link.Then ask whether operator continues to diagnose for instructions, if agreed to, program returns start over circulation and executes, if not Diagnosis is agreed to continue with, program execution terminates.
Beneficial effect of the present invention.
The present invention includes that current signal detection circuit, voltage signal detection circuit, accumulator body and environment temperature detect Circuit, irradiation intensity detection circuit, remote radio communication circuit, keyboard circuit, LCD display circuit and master cpu circuit lead to Overcurrent signal detection circuit and voltage signal detection circuit sample the electric current of critical circuits in power station and voltage scale, lead to Accumulator body and ambient temperature detection circuit is crossed respectively to become the temperature of the temperature of accumulator body and battery local environment For digital signal, ambient irradiation intensity is become by digital signal by irradiation intensity detection circuit, master cpu circuit completes signal It acquires and carries out fault diagnosis according to these signals, and realization is to work such as the long distance wireless transmissions of diagnostic result.
It is simple installation of the present invention, at low cost, safe and reliable.
The present invention is in use, by the jaw type current probe clamping connection in current signal detection circuit in photovoltaic module and off-network On route between inverter;3 groups of voltage tester probes of voltage signal detection circuit are connect respectively in off-network inverter and light Lie prostrate the interface of the interface of component, the interface of off-network inverter and battery, off-network inverter and load;By battery sheet The thermometric chip of temperature detection circuit is mounted on electric power storage pool surface, and the thermometric chip of battery environment temperature sensing circuit is put It sets in battery ambient enviroment;The light sensation probe of irradiation intensity detection circuit is lain in a horizontal plane in into outdoor.Diagnostor structure letter It is single, there is preferable applicability for photovoltaic off-grid power station.Diagnostor is at low cost, has the function of remote radio communication, to photovoltaic The operation and maintenance in off-network power station have larger practical value.
Detailed description of the invention
The present invention will be further described with reference to the accompanying drawings and detailed description.The scope of the present invention not only limits to In the statement of the following contents.
Fig. 1 is schematic block circuit diagram of the invention;
Fig. 2 is physical circuit schematic diagram a of the invention;
Fig. 3 is physical circuit schematic diagram b of the invention;
Fig. 4 is physical circuit schematic diagram c of the invention;
Fig. 5 is physical circuit schematic diagram d of the invention;
Fig. 6 is control program flow chart of the invention.
Specific embodiment
As shown, the present invention includes current signal detection circuit, voltage signal detection circuit, accumulator body and environment Temperature sensing circuit, irradiation intensity detection circuit, remote radio communication circuit, keyboard circuit, LCD display circuit and master control The signal output port of cpu circuit, current signal detection circuit is connected with the signal input port of master cpu circuit, voltage letter The signal output port of number detection circuit is connected with the signal input port of master cpu circuit, accumulator body and environment temperature The signal output port of detection circuit is connected with the signal input port of master cpu circuit, the signal of irradiation intensity detection circuit Output port is connected with the signal input port of master cpu circuit, the signal input port of remote radio communication circuit and master control The signal output port of cpu circuit is connected, and the control signal output mouth of keyboard circuit and the control signal of master cpu circuit are defeated Inbound port be connected, the signal transmission port of LCD display circuit respectively with the signal transmission port of master cpu circuit, LCD liquid crystal The signal transmission port of display screen is connected;The control signal input mouth of the keyboard circuit and the control signal output of keyboard Mouth is connected.
The current signal detection circuit is to be sampled the electric current proportion sample in route by jaw type current probe To analog signal digital signal is become by the AD conversion module inside master cpu after voltage follower circuit;
The voltage signal detection circuit is to be taken the voltage in route in proportion by Hall sensor by voltage tester probe Sample, the analog signal sampled become digital letter by the AD conversion module inside master cpu after signal conditioning circuit Number;
The accumulator body and ambient temperature detection circuit are to detect electric power storage by the temperature sensor of temperature detection chip interior The temperature of pond ontology and local environment, and temperature signal is become into digital signal by the analog-digital converter inside detection chip;
The irradiation intensity detection circuit is strong by the light intensity sensor detection ambient irradiation inside irradiation intensity detection chip Analog signal is spent, and irradiation intensity analog signal is become into digital signal by the analog-digital converter inside detection chip;
The remote radio communication circuit is to be believed by wireless communication module by the serial communication interface read failure of master cpu Breath, and fault message is subjected to long distance wireless transmission by GPRS network;
The function of the keyboard circuit and LCD display circuit is that the control parameter of fault diagnosis device, including irradiation level threshold is arranged Value, temperature threshold and inspection interval time, and the working condition of system and the history number of each parameter are checked by LCD screen online According to.
Fault diagnosis device of the present invention can a variety of physical quantity signals of online acquisition and comprehensive analysis obtain photovoltaic off-grid power station The features such as failure has breakdown judge accurate, and diagnosable failure mode is more.
Fault diagnosis device of the present invention is all made of external to the acquisition of various physical signals, and the detection to current signal is logical Hall current clamp is crossed to connect mode, to the detection of voltage signal believed by voltage clamp clamping connection mode, to accumulator body temperature Number detection be the route and not for not needing change power station by the way that thermometric chip is attached to electric power storage pool surface when using diagnostor Need to stop the normal operation in power station.
The present invention is suitable for carrying out fault diagnosis to the photovoltaic off-grid power station that DC voltage level is 24V, if to other The photovoltaic off-grid power station of DC voltage level carries out fault diagnosis, needs the circuit in the present invention, program making corresponding modification Rear can be used.
The master cpu circuit includes system clock circuit, program downloading and in-circuit emulation circuit, master cpu and power supply Conversion circuit, master cpu port are connected with system clock circuit port, program downloading with in-circuit emulation circuit port respectively, electricity Power-switching circuit is other chip power supplies for needing 3.3V power supply power supply in master cpu and circuit.
The master cpu acquires various physical quantity signals, to set signalling comprehensive, fault diagnosis is carried out, to diagnostic result Long distance wireless is sent.
The master cpu uses PIC18F6720 chip U1.PIC18F6720 chip passes through I2C communication interface reads environment Irradiation intensity value, realizes remote radio communication by serial communication interface, reads accumulator body by monobus communication interface With ambient temperature value.
The system clock circuit includes capacitor C5, capacitor C6, crystal oscillator X1, the one end crystal oscillator X1 respectively with the one end capacitor C5, 39 feet of U1 are connected, and the capacitor C5 other end is connected with ground wire, the one end capacitor C6 respectively, and the capacitor C6 other end is another with crystal oscillator X1 respectively One end, 40 feet of U1 are connected.
Described capacitor C5, C6 use 18pF capacitor, and crystal oscillator X1 uses 20MHz crystal oscillator.
Described program downloading and in-circuit emulation circuit include diode D1, resistance R1, resistance R2, capacitor C7, plug receptacle J2, The one end resistance R1 is connected with power supply VCC3.3V, diode D1 cathode respectively, the resistance R1 other end respectively with the one end capacitor C7, two Pole pipe D1 anode, the one end resistance R2 be connected, the capacitor C7 other end ground connection, the resistance R2 other end respectively with the 1 foot phase of plug receptacle J2 Even, 7 feet of U1 are connected, and 2 feet of plug receptacle J2 are connected with 6 feet of power supply VCC3.3V, J2 respectively, the 3 feet ground connection of plug receptacle J2, 4 feet of plug receptacle J2 are connected with 37 feet of U1, and 5 feet of plug receptacle J2 are connected with 42 feet of U1.
The resistance R1 uses 10K Ohmic resistance, and resistance R2 uses 1K Ohmic resistance, and diode D1 uses 1N4148 type two Pole pipe, capacitor C7 use 0.1 μ F capacitor.
The power-switching circuit includes electrolytic capacitor C1 and C4, capacitor C2 and C3, power conversion chip U2, plug receptacle The anode of J1, electrolytic capacitor C1 are connected with 1 foot of power supply VCC5V, the one end capacitor C2,3 feet of U2, plug receptacle J1 respectively, are electrolysed The cathode of capacitor C1 respectively with the capacitor C2 other end, 1 foot of U2, capacitor C3 one end, the cathode of electrolytic capacitor C4, plug receptacle J1 2 feet are connected, 1 foot of U2 ground connection, the anode of electrolytic capacitor C4 respectively with the capacitor C3 other end, 2 feet of U2, power supply VCC3.3V phase Even, 3 feet of plug receptacle J1 are connected with power supply -15V, and 4 feet of plug receptacle J1 are connected with power supply+15V.
Described capacitor C1, C4 use 10 μ F electrolytic capacitors, and capacitor C2, C3 use 0.1 μ F capacitor, and power conversion chip uses AMS1117-3.3。
The keyboard circuit includes exclusion RA1, resistance R3~R7, plug receptacle J3,1~5 foot of plug receptacle J3 respectively with row 60~64 feet of 2~6 feet, U1 that hinder RA1 are correspondingly connected with, and 6 feet of plug receptacle J3 are connected by resistance R3 with 12 feet of U1, are patched 7 feet of mouth J3 are connected by resistance R4 with 13 feet of U1, and 8 feet of plug receptacle J3 are connected by resistance R5 with 14 feet of U1, are patched 9 feet of mouth J3 are connected by resistance R6 with 15 feet of U1, and 10 feet of plug receptacle J3 are connected by resistance R7 with 16 feet of U1, exclusion 1 foot of RA1 is connected with power supply VCC3.3V.
Resistance R3~the R7 uses 20 Ohmic resistances, and exclusion RA1 uses 1K*5 exclusion.
The LCD display circuit include resistance R8~R11, NPN triode Q1, liquid crystal display U3, U3 12~18 Foot is corresponding with 49~55 feet of U1 respectively to be connected, and 19 feet of U3 are connected with 33 feet of U1,20 feet of U3 pass through resistance R11 respectively with The one end resistance R10,4 feet of U3 are connected, and the resistance R10 other end is connected with 3 feet of power supply VCC3.3V, U3 respectively;
21 feet of U3 are connected with the emitter of NPN triode Q1, the collector of NPN triode Q1 respectively with power supply VCC3.3V, electricity It hinders the one end R8 to be connected, the resistance R8 other end is connected with 36 feet of the one end resistance R9, U1 respectively, the resistance R9 other end and tri- pole NPN The base stage of pipe Q1 is connected;
22,1,2 feet of U3 are grounded, and 11 feet of U3 are connected with 48 feet of U1, and 10 feet of U3 are connected with 47 feet of U1,5~8 feet of U3 It is correspondingly connected with respectively with 43~46 feet of U1.
Described resistance R8, R9 use 820 Ohmic resistances, and resistance R10 uses 51K Ohmic resistance, and resistance R11 uses 6K ohm Resistance, NPN triode Q1 use 9014 type triodes.
The keyboard uses 5 × 5 keyboard.
The LCD liquid crystal display screen uses the LCD liquid crystal display screen LM24064B of 240 × 64 pixels.
The irradiation intensity detection circuit includes resistance R12 and R13, capacitor C8 and C9, irradiation intensity detection chip U4, connects The one end socket J4, capacitor C8 is connected with 4 feet of 1 foot of power supply VCC3.3V, U4, plug receptacle J4 respectively, capacitor C8 other end difference Be connected with 3 feet of 2 feet of U4,3 feet of U4, plug receptacle J4,3 feet of U4 ground connection, the one end resistance R12 respectively with the one end resistance R13, 5 feet of VCC3.3V, U4, the one end capacitor C9 are connected, 6 feet of the resistance R12 other end and U4,34 feet of U1, plug receptacle J4 2 feet It is connected, the resistance R13 other end is connected with 1 foot of 4 feet of U4,35 feet of U1, plug receptacle J4, capacitor C9 other end ground connection.
Described resistance R12, R13 use 10K Ohmic resistance, and capacitor C8, C9 use 0.1 μ F capacitor, and irradiation intensity detects core Piece uses BH1750FVI.
The remote radio communication circuit includes remote wireless communication module U5, capacitor C10, the one end capacitor C10 respectively with 1 foot of power supply VCC5V, U5 are connected, and the capacitor C10 other end is connected with 2 feet of ground wire, U5 respectively, the 3 feet ground connection of U5,4 feet of U5 It is connected with 32 feet of U1,5 feet of U5 are connected with 31 feet of U1.
The capacitor C10 uses 0.1 μ F capacitor, and remote wireless communication module U5 uses ATK-SIM800C.
The current signal detection circuit includes resistance R14 and R15, capacitor C11, zener diode D2, operational amplifier CA1, jaw type current probe M1, plug receptacle J5, M1 1 foot be connected respectively with 4 feet of power supply+15V, J5,2 feet of M1 respectively with Ground wire, J5 3 feet be connected, 3 feet of M1 are connected with 2 feet of power supply -15V, J5 respectively, and 4 feet of M1 are grounded, 5 feet of M1 respectively with 1 foot of CA1,1 foot of J5 are connected, and 5 feet of CA1 are connected with power supply+15V, and 2 feet of CA1 are connected with power supply -15V, 3 feet point of CA1 It is not connected with 4 feet of CA1, the one end resistance R14, the resistance R14 other end is connected with the one end capacitor C11, the one end resistance R15 respectively, Capacitor C11 other end ground connection, the resistance R15 other end are connected with 24 feet of the cathode of zener diode D2, U1 respectively, two pole of pressure stabilizing The plus earth of pipe D2.
Described resistance R14, R15 use 100K Ohmic resistance, and capacitor C11 uses 0.1 μ F capacitor, and zener diode D2 is used 1N4728 type zener diode, operational amplifier CA1 use LM321MFX.
The jaw type current probe M1 uses CHCS-LS08.
The voltage signal detection circuit includes resistance R16~R51, capacitor C12~C14, zener diode D3~D5, fortune Calculate amplifier CA2~CA7, plug receptacle J6~J8, voltage transformer U6~U8, U6 1 foot pass through resistance R16 and plug receptacle J6 2 feet are connected, and 2 feet of U6 are connected with 1 foot of plug receptacle J6, and 3 feet of U6 are connected with power supply -15V, 4 feet and the power supply+15V phase of U6 Even, 5 feet of U6 are connected with the one end resistance R17, the one end resistance R18 respectively, resistance R17 other end ground connection, the resistance R18 other end point It is not connected with 3 feet of CA2, the one end resistance R19,1 foot of CA2 is connected with the one end resistance R20, the one end resistance R21 respectively, resistance The R20 other end is connected with ground wire, the resistance R21 other end respectively, and 5 feet of CA2 are connected with power supply+15V, 2 feet and power supply-of CA2 15V be connected, the resistance R19 other end is connected with 4 feet of CA2, the one end resistance R22 respectively, the resistance R22 other end respectively with CA3 3 Foot, the one end resistance R23 are connected, and 1 foot of CA3 is connected with the one end resistance R24, the one end resistance R25 respectively, the resistance R24 other end point It is not connected with ground wire, the resistance R25 other end, 5 feet of CA3 are connected with power supply+15V, and 2 feet of CA3 are connected with power supply -15V, resistance The R23 other end is connected with 4 feet of CA3, the one end resistance R26 respectively, the resistance R26 other end respectively with the one end resistance R27, capacitor The one end C12 is connected, capacitor C12 other end ground connection, the resistance R27 other end cathode with 23 feet of U1, zener diode D3 respectively It is connected, the plus earth of zener diode D3;
1 foot of U7 is connected by resistance R28 with 2 feet of plug receptacle J7, and 2 feet of U7 are connected with 1 foot of plug receptacle J7,3 feet of U7 Be connected with power supply -15V, 4 feet of U7 are connected with power supply+15V, 5 feet of U7 respectively with the one end resistance R29, the one end resistance R30 phase Even, resistance R29 other end ground connection, the resistance R30 other end are connected with 3 feet of CA4, the one end resistance R31 respectively, the 1 foot difference of CA4 It is connected with the one end resistance R32, the one end resistance R33, the resistance R32 other end is connected with ground wire, the resistance R33 other end respectively, CA4's 5 feet are connected with power supply+15V, and 2 feet of CA4 are connected with power supply -15V, the resistance R31 other end respectively with 4 feet of CA4, resistance R34 One end be connected, the resistance R34 other end is connected with 3 feet of CA5, the one end resistance R35 respectively, 1 foot of CA5 respectively with resistance R36 mono- End, the one end resistance R37 are connected, and the resistance R36 other end is connected with ground wire, the resistance R37 other end respectively, and 5 feet of CA5 and power supply+ 15V is connected, and 2 feet of CA5 are connected with power supply -15V, and the resistance R35 other end is connected with 4 feet of CA5, the one end resistance R38 respectively, electricity The resistance R38 other end is connected with the one end resistance R39, the one end capacitor C13 respectively, capacitor C13 other end ground connection, the resistance R39 other end It is connected respectively with the cathode of 22 feet of U1, zener diode D4, the plus earth of zener diode D4;
1 foot of U8 is connected by resistance R40 with 2 feet of plug receptacle J8, and 2 feet of U8 are connected with 1 foot of plug receptacle J8,3 feet of U8 Be connected with power supply -15V, 4 feet of U8 are connected with power supply+15V, 5 feet of U8 respectively with the one end resistance R41, the one end resistance R42 phase Even, resistance R41 other end ground connection, the resistance R42 other end are connected with 3 feet of CA6, the one end resistance R43 respectively, the 1 foot difference of CA6 It is connected with the one end resistance R44, the one end resistance R45, the resistance R44 other end is connected with ground wire, the resistance R45 other end respectively, CA6's 5 feet are connected with power supply+15V, and 2 feet of CA6 are connected with power supply -15V, the resistance R43 other end respectively with 4 feet of CA6, resistance R46 One end be connected, the resistance R46 other end is connected with 3 feet of CA7, the one end resistance R47 respectively, 1 foot of CA7 respectively with resistance R48 mono- End, the one end resistance R49 are connected, and the resistance R48 other end is connected with ground wire, the resistance R49 other end respectively, and 5 feet of CA7 and power supply+ 15V is connected, and 2 feet of CA7 are connected with power supply -15V, and the resistance R47 other end is connected with 4 feet of CA7, the one end resistance R50 respectively, electricity The resistance R50 other end is connected with the one end resistance R51, the one end capacitor C14 respectively, capacitor C14 other end ground connection, the resistance R51 other end It is connected respectively with the cathode of 21 feet of U1, zener diode D5, the plus earth of zener diode D5.
Described resistance R16, R28, R40 use 2 watts of power of 3K Ohmic resistance, and resistance R17, R29, R41 use 120 Europe Nurse resistance, resistance R18~R21, R30~R33, R42~R45 use 20K Ohmic resistance, resistance R22~R25, R34~R37, R46~R49 uses 10K Ohmic resistance, and resistance R26~R27, R38~R39, R50~R51 use 10K Ohmic resistance, capacitor C12 ~C14 uses 0.1 μ F capacitor, and zener diode D3~D5 uses 1N4728 type zener diode, operational amplifier CA2~CA7 Using LM321MFX.
The voltage transformer uses HNV025A.
The accumulator body and ambient temperature detection circuit include resistance R52~R53, capacitor C15~C16, plug receptacle J9~J10, thermometric chip U9~U10, U9 3 feet respectively with the one end resistance R52, the one end capacitor C15, power supply VCC3.3V, patch 3 feet of mouth J9 are connected, and the resistance R52 other end is connected with 27 feet of 2 feet of U9,1 foot of plug receptacle J9, U1 respectively, and capacitor C15 is another One end is connected with 2 feet of 1 foot of U9, ground wire, plug receptacle J9 respectively;
3 feet of U10 are connected with 3 feet of the one end resistance R53, the one end capacitor C16, power supply VCC3.3V, plug receptacle J10 respectively, resistance The R53 other end is connected with 28 feet of 2 feet of U10,1 foot of plug receptacle J10, U1 respectively, the capacitor C16 other end respectively with U10 1 Foot, ground wire, 2 feet of plug receptacle J10 are connected.
Resistance R52~the R53 uses 4.7K Ohmic resistance, and capacitor C15~C16 uses 0.1 μ F capacitor, thermometric chip U9 ~U10 uses DS18B20 chip.
As shown in fig. 6, first using keyboard to set up initial parameter, including irradiation level threshold value F when the present invention starts to workth, temperature Threshold value Tth, inspection interval time, subsequently into cyclic program execute step in.Acquire various physical signals, including voltage signal, Current signal, irradiance signal, temperature signal.Judge whether system goes out according to collected physical signal value and fault diagnosis table Existing failure, fault diagnosis table is as shown in table 1, if do not broken down, asks whether operator continues to diagnose for instructions, if agreed to, Diagnostor enters the waiting of inspection interval time, and program returns start over circulation and executes after waiting, continues to examine if disagreed Disconnected, program execution terminates.If there is failure, then failure is diagnosed, and fault message is shown by LCD screen, then asked Show whether operator remotely sends fault message, if agreed to, fault message will remotely be sent to monitoring by GPRS network Center will skip long-range sending link if disagreed.Then ask whether operator continues to diagnose for instructions, if agreed to, program is returned It returns beginning circulation to execute, continues to diagnose if disagreed, program execution terminates.
1 fault diagnosis table of table
Signal value Fault type
Ua=0V Photovoltaic module wiring open circuit
F>FthAnd 21.6V < Ub< 28.8V and Ua> 0V and Ia=0A Controller charge function failure
Ub<21.6V Battery over-discharge
Ub=0V Battery wiring open circuit
Ub>28.8V Accumulator super-charge
(Tbat-Tenv)>Tth Battery overheat
Uc=0V Load wiring open circuit
Note 1: this table is suitable for the photovoltaic off-grid power station that DC voltage level is 24V.
Wherein, Ua、Ub、UcVoltage value in respectively Fig. 1 at a, b, c tri-, IaFor the current value at a in Fig. 1, F is environment Irradiation intensity, FthFor the irradiation level threshold value of default, TbatFor accumulator body temperature, TenvFor battery environment temperature, Tth For the temperature threshold of default.
The present invention is in use, by the jaw type current probe clamping connection in current signal detection circuit in photovoltaic module and off-network On route between inverter;3 groups of voltage tester probes of voltage signal detection circuit are connect respectively in off-network inverter and light Lie prostrate the interface of the interface of component, the interface of off-network inverter and battery, off-network inverter and load;By battery sheet The thermometric chip of temperature detection circuit is mounted on electric power storage pool surface, and the thermometric chip of battery environment temperature sensing circuit is put It sets in battery ambient enviroment;The light sensation probe of irradiation intensity detection circuit is lain in a horizontal plane in into outdoor.
It is understood that being merely to illustrate the present invention above with respect to specific descriptions of the invention and being not limited to this Technical solution described in inventive embodiments, those skilled in the art should understand that, still the present invention can be carried out Modification or equivalent replacement, to reach identical technical effect;As long as meet use needs, all protection scope of the present invention it It is interior.

Claims (6)

1. a kind of portable on-line fault diagnosis device in photovoltaic off-grid power station, including the detection of current signal detection circuit, voltage signal Circuit, accumulator body and ambient temperature detection circuit, irradiation intensity detection circuit, remote radio communication circuit, keyboard circuit, LCD display circuit and master cpu circuit, it is characterised in that the signal output port and master cpu of current signal detection circuit The signal input port of circuit is connected, and the signal output port of voltage signal detection circuit and the signal of master cpu circuit input Port is connected, the signal output port of accumulator body and ambient temperature detection circuit and the signal input part of master cpu circuit Mouth is connected, and the signal output port of irradiation intensity detection circuit is connected with the signal input port of master cpu circuit, long distance wireless The signal input port of telecommunication circuit is connected with the signal output port of master cpu circuit, the control signal output of keyboard circuit Port is connected with the control signal input mouth of master cpu circuit, the signal transmission port of LCD display circuit respectively with master control Signal transmission port, the signal transmission port of LCD liquid crystal display screen of cpu circuit are connected;The control signal of the keyboard circuit Input port is connected with the control signal output mouth of keyboard.
2. the portable on-line fault diagnosis device in a kind of photovoltaic off-grid power station according to claim 1, it is characterised in that the electricity Flowing signal deteching circuit is the analog signal warp for being sampled the electric current proportion sample in route by jaw type current probe Overvoltage, which follows, becomes digital signal by the AD conversion module inside master cpu after circuit;
The voltage signal detection circuit is to be taken the voltage in route in proportion by Hall sensor by voltage tester probe Sample, the analog signal sampled become digital letter by the AD conversion module inside master cpu after signal conditioning circuit Number.
3. the portable on-line fault diagnosis device in a kind of photovoltaic off-grid power station according to claim 1, it is characterised in that the storage Battery body and ambient temperature detection circuit is by the temperature sensor of temperature detection chip interior detection accumulator body and institutes Locate the temperature of environment, and temperature signal is become into digital signal by the analog-digital converter inside detection chip;
The irradiation intensity detection circuit is strong by the light intensity sensor detection ambient irradiation inside irradiation intensity detection chip Analog signal is spent, and irradiation intensity analog signal is become into digital signal by the analog-digital converter inside detection chip.
4. the portable on-line fault diagnosis device in a kind of photovoltaic off-grid power station according to claim 1, it is characterised in that described remote Journey radio communication circuit is by wireless communication module by the serial communication interface read failure information of master cpu, and by failure Information carries out long distance wireless transmission by GPRS network;
The function of the keyboard circuit and LCD display circuit is that the control parameter of fault diagnosis device, including irradiation level threshold is arranged Value, temperature threshold and inspection interval time, and the working condition of system and the history number of each parameter are checked by LCD screen online According to.
5. the portable on-line fault diagnosis device in a kind of photovoltaic off-grid power station according to claim 1, it is characterised in that the master Control cpu circuit includes system clock circuit, program downloading and in-circuit emulation circuit, master cpu and power-switching circuit, master control Cpu port is connected with system clock circuit port, program downloading with in-circuit emulation circuit port respectively, based on power-switching circuit Control other chips power supplies for needing 3.3V power supply power supply in CPU and circuit.
6. the portable on-line fault diagnosis device in a kind of photovoltaic off-grid power station according to claim 5, it is characterised in that the master It controls CPU and acquires various physical quantity signals, to set signalling comprehensive, carry out fault diagnosis, diagnostic result long distance wireless is sent.
CN201810676080.0A 2018-06-27 2018-06-27 A kind of portable on-line fault diagnosis device in photovoltaic off-grid power station Withdrawn CN109039276A (en)

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CN112114543A (en) * 2020-08-07 2020-12-22 王嘉欣 AC circuit break controller

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