CN104917455B - Inverting apparatus and photovoltaic power system using the same - Google Patents

Inverting apparatus and photovoltaic power system using the same Download PDF

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Publication number
CN104917455B
CN104917455B CN201510083292.4A CN201510083292A CN104917455B CN 104917455 B CN104917455 B CN 104917455B CN 201510083292 A CN201510083292 A CN 201510083292A CN 104917455 B CN104917455 B CN 104917455B
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China
Prior art keywords
voltage
stablizer
ground connection
resistor
inverter
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Application number
CN201510083292.4A
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Chinese (zh)
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CN104917455A (en
Inventor
陈汉威
游俊豪
刘家桦
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FSP Technology Inc
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FSP Technology Inc
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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/36—Means for starting or stopping converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
    • H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
    • H02H7/122—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters
    • H02H7/1225—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters responsive to internal faults, e.g. shoot-through
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/12—Arrangements for reducing harmonics from ac input or output
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0048—Circuits or arrangements for reducing losses
    • 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
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
    • 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)
  • Inverter Devices (AREA)
  • Dc-Dc Converters (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Electronic Switches (AREA)

Abstract

An inverting apparatus is provided. The inverting apparatus includes an inverting circuit, a control circuit, and a voltage regulator-based ground detection circuit. The control circuit controls the power conversion of the inverting circuit. The voltage regulator-based ground detection circuit samples an input voltage of the DC input power, and performs voltage regulation and voltage division on the input voltage to generate a ground indication voltage. The electric potential of the output terminal of the voltage regulator is built based on a photovoltaic ground terminal of a photovoltaic module. The ground indication voltage is the voltage difference between an output terminal of the voltage regulator and a device ground terminal of the inverting apparatus. The control circuit determines whether a ground fault occurs to the photovoltaic module and enables a ground protection mechanism to control the inverting circuit when the ground fault occurs. The inverting apparatus is capable of accurately detecting whether a ground fault occurs to a front-end photovoltaic module. The invention further discloses a photovoltaic power system.

Description

Inverter and the photovoltaic power supply system using it
Technical field
The present invention relates to a kind of power converter topology, more particularly to a kind of inverter and the photo-voltaic power supply system using it System.
Background technology
In general photovoltaic power supply system, the optical-electric module (such as solar panels) of its front end typically can be disposed in the outdoor To receive sunshine.However, the inevasible meeting of the optical-electric module being disposed in the outdoor is affected by climatic environment, and there is damage Risk.
For example, the photovoltaic earth terminal of optical-electric module may be changed into floating because of climatic effect (floating) so that the device earth terminal of the photovoltaic earth terminal of optical-electric module and the inverter of rear end not equipotential, this shows Earth fault as being referred to as optical-electric module.In the case of earth fault, can be because between photovoltaic earth terminal and device earth terminal A leakage current is produced for potential difference.And excessive leakage current is then likely to result in user and gets an electric shock or fire generation.
Under existing technology, above-mentioned photoelectricity typically can be detected using Low frequency signal injection method or frequency variation signal injection method The earth fault problem of module, but existing method is all needed using complicated circuit framework, and and cannot accurately detect Situation to earth fault occurs.
Accordingly, it would be desirable to a kind of inverter and above-mentioned existing problems be solved using its photovoltaic power supply system.
The content of the invention
One purpose of the present invention is to provide a kind of inverter, and the inverter can exactly detect the photoelectricity of front end Whether module there is earth fault.
Another object of the present invention is to provide a kind of photovoltaic power supply system, the photovoltaic power supply system can be detected exactly Whether the optical-electric module of front end there is earth fault.
To achieve these goals, the invention provides a kind of inverter, is suitable to receive a direct current from an optical-electric module Input power, and an exchange out-put supply is produced according to the direct-current input power supplying, wherein, the inverter includes：
One inverter circuit, the direct-current input power supplying is converted to into the exchange out-put supply；
One control circuit, couples the inverter circuit, to the Power convert for controlling the inverter circuit；And
The one ground connection circuit for detecting based on voltage-stablizer, couples the direct-current input power supplying and the control circuit, uses To sample an input voltage of the direct-current input power supplying, and voltage stabilizing and partial pressure are carried out to the input voltage, use generation One ground connection instructed voltage, wherein the current potential of an output end of the voltage-stablizer is based on a photovoltaic earth terminal of the optical-electric module Set up, the ground connection instructed voltage be the output end and the inverter of the voltage-stablizer a device earth terminal it Between voltage difference,
Wherein, the control circuit judges whether the optical-electric module occurs ground connection event according to the ground connection instructed voltage Barrier, and enable a ground protection mechanism to control the inverter circuit when judging to occur the earth fault.
It is preferred that the control circuit judges whether the ground connection instructed voltage is located in a normal voltage range, if institute State ground connection instructed voltage to be located in the normal voltage range, the control circuit judges that the optical-electric module does not occur described connecing Earth fault, and if the ground connection instructed voltage be located at outside the normal voltage range, the control circuit judges the photoelectricity There is the earth fault in module.
It is preferred that the ground connection circuit for detecting based on voltage-stablizer includes：
One power conversion unit, to sample the input voltage, and produces one with reference to electricity according to the input voltage Pressure；And
One detecting unit, couples the power conversion unit to receive the reference voltage, and the reference voltage is carried out Voltage stabilizing produces the ground connection instructed voltage to produce a voltage of voltage regulation according to the voltage of voltage regulation, wherein the voltage stabilizing is electric Press as the voltage difference between the output end of the voltage-stablizer and a photovoltaic earth terminal of the optical-electric module.
It is preferred that the detecting unit includes：
The voltage-stablizer, the input of the voltage-stablizer receives the reference voltage, and the output end of the voltage-stablizer Export the voltage of voltage regulation；
One first resistor, the first end of the first resistor couples the output end of the voltage-stablizer, and the first resistor The second end couple the device earth terminal of the inverter, wherein the ground connection instructed voltage be the first resistor across Pressure；And
One second resistance, the first end of the second resistance couples the second end and the described device ground connection of the first resistor End, and the second end of the second resistance couples the photovoltaic earth terminal of the optical-electric module.
It is preferred that the detecting unit is further included：
One 3rd resistor, the first end of the 3rd resistor receives the reference voltage, and the second of the 3rd resistor The input of the end coupling voltage-stablizer；And
One the 4th resistance, the first end of the 4th resistance couples the second end of the 3rd resistor, and described 4th electric Second end of resistance couples the output end of the voltage-stablizer and the first end of the first resistor.
In order to realize another object of the present invention, the invention provides a kind of photovoltaic power supply system, including：
One optical-electric module, to produce a direct-current input power supplying, wherein the optical-electric module has a photovoltaic earth terminal；With And
One inverter, couples the optical-electric module, is suitable to for the direct-current input power supplying to be converted to exchange output electricity Source, wherein the inverter has a device earth terminal, and the inverter includes：
One inverter circuit, the direct-current input power supplying is converted to into the exchange out-put supply；
One control circuit, couples the inverter circuit, to the Power convert for controlling the inverter circuit；And
The one ground connection circuit for detecting based on voltage-stablizer, couples the inverter circuit and the control circuit, to take One input voltage of direct-current input power supplying described in sample, and voltage stabilizing and partial pressure are carried out to the input voltage, use generation one and connect Ground instructed voltage, wherein the current potential of an output end of the voltage-stablizer is set up based on the photovoltaic earth terminal, the ground connection Instructed voltage is the voltage difference between the output end of the voltage-stablizer and described device earth terminal,
Wherein, the control circuit judges whether the optical-electric module occurs ground connection event according to the ground connection instructed voltage Barrier, and enable a ground protection mechanism to control the inverter circuit when judging to occur the earth fault.
It is preferred that the control circuit judges whether the ground connection instructed voltage is located in a normal voltage range, if institute State ground connection instructed voltage to be located in the normal voltage range, the control circuit judges that the optical-electric module does not occur described connecing Earth fault, and if the ground connection instructed voltage be located at outside the normal voltage range, the control circuit judges the photoelectricity There is the earth fault in module.
It is preferred that the ground connection circuit for detecting based on voltage-stablizer includes：
One power conversion unit, to sample the input voltage, and produces one with reference to electricity according to the input voltage Pressure；And
One detecting unit, couples the power conversion unit to receive the reference voltage, and the reference voltage is carried out Voltage stabilizing produces the ground connection instructed voltage to produce a voltage of voltage regulation according to the voltage of voltage regulation, wherein the voltage stabilizing is electric Press as the voltage difference between the output end of the voltage-stablizer and a photovoltaic earth terminal of the optical-electric module.
It is preferred that the detecting unit includes：
The voltage-stablizer, the input of the voltage-stablizer receives the reference voltage, and the output end of the voltage-stablizer Export the voltage of voltage regulation；
One first resistor, the first end of the first resistor couples the output end of the voltage-stablizer, and the first resistor The second end couple the device earth terminal of the inverter, wherein the ground connection instructed voltage be the first resistor across Pressure；And
One second resistance, the first end of the second resistance couples the second end and the described device ground connection of the first resistor End, and the second end of the second resistance couples the photovoltaic earth terminal of the optical-electric module.
It is preferred that the detecting unit is further included：
One 3rd resistor, the first end of the 3rd resistor receives the reference voltage, and the second of the 3rd resistor The input of the end coupling voltage-stablizer；And
One the 4th resistance, the first end of the 4th resistance couples the second end of the 3rd resistor, and described 4th electric Second end of resistance couples the output end of the voltage-stablizer and the first end of the first resistor.
Compared with prior art, inverter of the invention and using its photovoltaic power supply system can be by with voltage-stablizer The ground connection circuit for detecting on basis uses producing the photovoltaic of an instruction optical-electric module and connect carrying out voltage stabilizing and partial pressure to input voltage The ground connection instructed voltage of the voltage difference of the output end of ground terminal and voltage-stablizer.Wherein, inverter can indicate electricity according to the ground connection Whether pressure is located in normal voltage range to judge whether optical-electric module occurs earth fault, and starts according to judged result corresponding Protection mechanism.
Description of the drawings
Fig. 1 is the schematic diagram of the photovoltaic power supply system of one embodiment of the invention.
Fig. 2 is the schematic diagram of the ground connection circuit for detecting of one embodiment of the invention.
【Symbol description】
10：Photovoltaic power supply system
100：Inverter
110：Inverter circuit
120：Control circuit
130：Ground connection circuit for detecting
132：Power conversion unit
134：Detecting unit
ACout：Exchange out-put supply
DCin：Direct-current input power supplying
EG：Electrical network
GNDd：Device earth terminal
GNDp：Photovoltaic earth terminal
I：Leakage current
Iin：Input current
Iout：Output current
PVm：Optical-electric module
OT：The output end of voltage-stablizer
R1、R2、R3、R4：Resistance
Sc：Control signal
VR：Voltage-stablizer
Vd：Ground connection instructed voltage
Vin：Input voltage
Vout：Output voltage
Vref：Reference voltage
Vs：Voltage of voltage regulation
Specific embodiment
In order that disclosed herein content can easily be understood, below especially exemplified by embodiment as the invention discloses The example that can actually implement according to this.In addition, all possible parts, the group of identical label used in schema and embodiment Part/component/step, represents same or like part.
Fig. 1 is the schematic diagram of the photovoltaic power supply system of one embodiment of the invention.Refer to Fig. 1, in the present embodiment, photovoltaic Power-supply system 10 includes optical-electric module PVm and inverter 100.Optical-electric module (photovoltaic module) PVm is to incite somebody to action Solar energy is converted to the direct-current input power supplying DCin (comprising input voltage vin and input current Iin) of electrical energy form.Inverter The direct-current input power supplying DCin that 100 reception optical-electric module PVm are exported, and it is defeated to produce exchange according to direct-current input power supplying DCin Go out power supply ACout (comprising output voltage Vout and output current Iout).Wherein, the photovoltaic power supply system of the present embodiment is photovoltaic Grid-connected system, the exchange out-put supply of inverter is available to rear end and the electrical network EG for connecing, but is not limited, inverter Rear end can also connect a battery system or an illuminator.
In the present embodiment, inverter 100 includes inverter circuit 110, control circuit 120 and ground connection circuit for detecting 120. Inverter circuit 110 can receive direct-current input power supplying DCin from optical-electric module PVm, and direct-current input power supplying DCin to be changed To exchange out-put supply ACout.Wherein, the circuit configurations of the inverter circuit 110 can be symmetrical for half-bridge asymmetric, half-bridge Formula, full-bridge type or other feasible inverter circuit configurations, the present invention is not any limitation as to this.
Control circuit 120 couples inverter circuit 110, and to provide a control signal Sc electricity of inverter circuit 110 is controlled Source transition operation, control signal Sc can be a pulse-width modulation signal of the switching cycle for controlling inverter circuit 110 (PWM signal), but the present invention is not limited.
The circuit framework of the ground connection circuit for detecting 130 of the present embodiment is with voltage-stablizer (voltage regulator) as base Plinth, its coupling inverter circuit 110 and control circuit 120.Ground connection circuit for detecting 130 is to sample the defeated of direct-current input power supplying DCin Enter voltage Vin, and the circuit framework by voltage-stablizer (subsequent implementation regular meeting specifically shows) is carried out surely to input voltage vin Pressure and partial pressure, use generation ground connection instructed voltage Vd to control circuit 120.Therefore, control circuit 120 can be indicated according to ground connection Voltage Vd is judging whether optical-electric module PVm occurs earth fault (that is, the current potential of the photovoltaic earth terminal GNDp of optical-electric module PVm It is unequal with the current potential of the device earth terminal GNDd of inverter 100), and there is earth fault in judgement optical-electric module PVm Shi Qiyong ground protections mechanism is used and avoids being made because of the earth fault problem of optical-electric module PVm to control inverter circuit 110 Get an electric shock into user or fire occurs.
In the present embodiment, be grounded circuit for detecting 130 produced by ground connection instructed voltage Vd for voltage-stablizer output end and Voltage difference between the device earth terminal GNDd of inverter 100.Wherein, because the voltage of the output end of voltage-stablizer is based on light The photovoltaic earth terminal GNDp of electric module PVm is set up, therefore the change of ground connection instructed voltage Vd may indicate that photovoltaic earth terminal Whether GNDp is equal with the current potential of device earth terminal GNDd.For example, control circuit 120 can judge that being grounded instructed voltage Vd is It is no interior positioned at normal voltage range (can be by designer's self-defining), if ground connection instructed voltage Vd is located in normal voltage range, Then control circuit 120 can judge that optical-electric module PVm does not occur earth fault.If conversely, ground connection instructed voltage Vd is located at normal electricity Outside pressure scope, then control circuit 120 can judge that optical-electric module PVm occurs earth fault.
The concrete framework of the ground connection circuit for detecting 130 of the embodiment of the present invention is illustrated with reference to Fig. 2.Wherein, Fig. 2 is this Invent the schematic diagram of the ground connection circuit for detecting of an embodiment.
Referring to Fig. 1 and Fig. 2, the ground connection circuit for detecting 130 of the present embodiment includes power conversion unit 132 and detecting Unit 134.The input of the coupling inverter circuit 110 of power conversion unit 132 is to sample input voltage vin and electric to input Pressure Vin carries out Power convert, and according to input voltage vin reference voltage Vref is produced.
Detecting unit 134 couples power conversion unit 132 to receive reference voltage Vref.Wherein, detecting unit 134 can be right Reference voltage Vref carries out voltage stabilizing to produce voltage of voltage regulation Vs, and produces ground connection instructed voltage Vd according to voltage of voltage regulation Vs.In This, the voltage of voltage regulation Vs is the voltage difference between output end OT and the photovoltaic earth terminal GNDp of optical-electric module PVm of voltage-stablizer.
More specifically, detecting unit 134 may be selected to be and is made up of voltage-stablizer VR and resistance R1~R4.Voltage-stablizer VR Jing Reference voltage Vref is received from power conversion unit 132 by resistance R3, and voltage stabilizing is carried out based on reference voltage Vref, used Output end OT exports voltage of voltage regulation Vs.
The first end of resistance R1 couples the output end of voltage-stablizer VR, and the second end coupling inverter 100 of resistance R1 Device earth terminal GNDd.Second end of the first end coupling resistance R1 of resistance R2 and device earth terminal GNDd, and resistance R2 The second end coupling photovoltaic earth terminal GNDp.The first end of resistance R3 receives reference voltage Vref, and second end of resistance R3 The input of coupling voltage-stablizer VR.Second end of the first end coupling resistance R3 of resistance R4, and the second end coupling of resistance R4 The output end of voltage-stablizer VR and the first end of resistance R1.
In the present embodiment, be grounded instructed voltage Vd and be the cross-pressure of resistance R1, and voltage of voltage regulation Vs be then resistance R1 with The cross-pressure of R2, is also the voltage difference between output end OT and photovoltaic earth terminal GNDp.
Specifically, in the case of optical-electric module PVm does not occur earth fault, photovoltaic earth terminal GNDp is grounded with device End GNDd can substantially have identical current potential.Therefore, in detecting unit 134, resistance R2 is the state in being shorted, and is made The magnitude of voltage that instructed voltage Vd must be grounded can be identical with the magnitude of voltage of voltage of voltage regulation Vs.Because voltage of voltage regulation Vs is one fixed Magnitude of voltage, so designer can set corresponding normal voltage range according to the rated output of voltage-stablizer VR so that ground connection refers to The magnitude of voltage for showing voltage Vd falls in normal voltage range.Consequently, it is possible to control circuit 120 can be according to ground connection instructed voltage Vd And judge that optical-electric module PVm does not occur earth fault.
On the other hand, in the case of optical-electric module PVm occurs earth fault, photovoltaic earth terminal GNDp and device earth terminal GNDd can have different current potentials.In other words, device earth terminal GNDd and photovoltaic earth terminal GNDp produces one and flows through resistance R2's Leakage current I, so as to cause a voltage difference at the two ends of resistance R2.In this it should be noted that it is only to show that the arrow of leakage current I is pointed to Meaning, under different ground fault conditions, leakage current I also can flow to device earth terminal GNDd by photovoltaic earth terminal GNDp.
Now, the cross-pressure of resistance R2 can react on the leakage current I that flows through and rise.Because voltage of voltage regulation Vs is fixation electricity Pressure value, therefore the cross-pressure (that is, be grounded instructed voltage Vd) of resistance R1 can react on the cross-pressure of resistance R2 and rise and corresponding decline. If leakage current I exceedes certain magnitude of current, ground connection instructed voltage Vd can be lifted or be down to beyond normal voltage range so that control Circuit processed 120 judges that optical-electric module PVm occurs earth fault according to ground connection instructed voltage Vd.
For example, if the voltage of voltage regulation Vs of voltage-stablizer VR rated outputs be 2.5V, and under ground-fault condition photovoltaic The leakage current I of 1mA can be produced between earth terminal GNDp and device earth terminal GNDd.The resistance value of resistance R1 and R2 selects to be 1k Ω, and the normal voltage range selects to be 2V~3V.Now, resistance R2 can react on 1mA leakage current and set up 1V across Pressure, so as to cross-pressure/ground connection instructed voltage Vd for causing resistance R1 is down to 1.5V from 2.5V.Therefore, control circuit 120 i.e. can foundation Ground connection instructed voltage Vd judges that optical-electric module PVm occurs earth fault.
In sum, the embodiment of the present invention proposes a kind of inverter and the photovoltaic power supply system using it, can by with Ground connection circuit for detecting based on voltage-stablizer uses one instruction inverter of generation carrying out voltage stabilizing and partial pressure to input voltage The ground connection instructed voltage of the voltage difference of 100 device earth terminal GNDd and the output end of voltage-stablizer.Wherein, inverter can foundation Whether the ground connection instructed voltage is located in normal voltage range to judge whether optical-electric module occurs earth fault, and foundation is sentenced Disconnected result starts corresponding protection mechanism.
Above disclosed is only the preferred embodiments of the present invention, can not limit the right of the present invention with this certainly Scope, therefore the equivalent variations made according to scope of the present invention patent, still belong to the scope that the present invention is covered.

Claims (8)

1. a kind of inverter, is suitable to receive a direct-current input power supplying from an optical-electric module, and according to the direct-current input power supplying Produce one and exchange out-put supply, it is characterised in that the inverter includes：
One inverter circuit, the direct-current input power supplying is converted to into the exchange out-put supply；
One control circuit, couples the inverter circuit, to the Power convert for controlling the inverter circuit；And
The one ground connection circuit for detecting based on voltage-stablizer, couples the direct-current input power supplying and the control circuit, to take One input voltage of direct-current input power supplying described in sample, wherein the ground connection circuit for detecting based on voltage-stablizer includes a detecting Unit carries out voltage stabilizing and partial pressure to the input voltage, uses generation one and is grounded instructed voltage, wherein the voltage-stablizer is one defeated The current potential for going out end is set up based on a photovoltaic earth terminal of the optical-electric module, and the ground connection instructed voltage is the voltage-stablizer The output end and a device earth terminal of the inverter between voltage difference,
Wherein, the control circuit judges whether the optical-electric module occurs an earth fault according to the ground connection instructed voltage, And enable a ground protection mechanism to control the inverter circuit when judging to occur the earth fault；
Wherein, the detecting unit includes：
The voltage-stablizer, the input of the voltage-stablizer receives the reference voltage, and the output end output of the voltage-stablizer The voltage of voltage regulation；
One first resistor, the first end of the first resistor couples the output end of the voltage-stablizer, and the of the first resistor Two ends couple the device earth terminal of the inverter, wherein the ground connection instructed voltage is the cross-pressure of the first resistor；With And
One second resistance, the first end of the second resistance couples the second end and the described device earth terminal of the first resistor, And the second end of the second resistance couples the photovoltaic earth terminal of the optical-electric module.
2. inverter according to claim 1, it is characterised in that the control circuit judges the ground connection instructed voltage Whether it is located in a normal voltage range, if the ground connection instructed voltage is located in the normal voltage range, the control electricity Road judges that the optical-electric module does not occur the earth fault, and if the ground connection instructed voltage be located at the normal voltage model Enclose outer, the control circuit judges that the optical-electric module occurs the earth fault.
3. inverter according to claim 1, it is characterised in that the ground connection circuit for detecting based on voltage-stablizer Including：
One power conversion unit, to sample the input voltage, and produces a reference voltage according to the input voltage；With And
The detecting unit, couples the power conversion unit to receive the reference voltage, and the reference voltage is carried out surely Pressure produces the ground connection instructed voltage to produce a voltage of voltage regulation according to the voltage of voltage regulation, wherein the voltage of voltage regulation Voltage difference between one photovoltaic earth terminal of output end and the optical-electric module for the voltage-stablizer.
4. inverter according to claim 1, it is characterised in that the detecting unit is further included：
One 3rd resistor, the first end of the 3rd resistor receives the reference voltage, and the second end coupling of the 3rd resistor Connect the input of the voltage-stablizer；And
One the 4th resistance, the second end of the first end coupling 3rd resistor of the 4th resistance, and the 4th resistance Second end couples the output end of the voltage-stablizer and the first end of the first resistor.
5. a kind of photovoltaic power supply system, it is characterised in that include：
One optical-electric module, to produce a direct-current input power supplying, wherein the optical-electric module has a photovoltaic earth terminal；And
One inverter, couples the optical-electric module, is suitable to for the direct-current input power supplying to be converted to an exchange out-put supply, its Described in inverter there is a device earth terminal, and the inverter includes：
One inverter circuit, the direct-current input power supplying is converted to into the exchange out-put supply；
One control circuit, couples the inverter circuit, to the Power convert for controlling the inverter circuit；And
The one ground connection circuit for detecting based on voltage-stablizer, couples the inverter circuit and the control circuit, to sample An input voltage of direct-current input power supplying is stated, wherein the ground connection circuit for detecting based on voltage-stablizer includes a detecting unit Voltage stabilizing and partial pressure are carried out to the input voltage, generation one is used and is grounded instructed voltage, wherein an output end of the voltage-stablizer Current potential be to be set up based on the photovoltaic earth terminal, it is described ground connection instructed voltage be the voltage-stablizer the output end and institute The voltage difference between device earth terminal is stated,
Wherein, the control circuit judges whether the optical-electric module occurs an earth fault according to the ground connection instructed voltage, And enable a ground protection mechanism to control the inverter circuit when judging to occur the earth fault；
Wherein, the detecting unit includes：
The voltage-stablizer, the input of the voltage-stablizer receives the reference voltage, and the output end output of the voltage-stablizer The voltage of voltage regulation；
One first resistor, the first end of the first resistor couples the output end of the voltage-stablizer, and the of the first resistor Two ends couple the device earth terminal of the inverter, wherein the ground connection instructed voltage is the cross-pressure of the first resistor；With And
One second resistance, the first end of the second resistance couples the second end and the described device earth terminal of the first resistor, And the second end of the second resistance couples the photovoltaic earth terminal of the optical-electric module.
6. photovoltaic power supply system according to claim 5, it is characterised in that the control circuit judges that the ground connection indicates Whether voltage is located in a normal voltage range, if the ground connection instructed voltage is located in the normal voltage range, the control Circuit processed judges that the optical-electric module does not occur the earth fault, and if the ground connection instructed voltage be located at the normal electricity Outside pressure scope, the control circuit judges that the optical-electric module occurs the earth fault.
7. photovoltaic power supply system according to claim 5, it is characterised in that the ground connection detecting based on voltage-stablizer Circuit includes：
One power conversion unit, to sample the input voltage, and produces a reference voltage according to the input voltage；With And
The detecting unit, couples the power conversion unit to receive the reference voltage, and the reference voltage is carried out surely Pressure produces the ground connection instructed voltage to produce a voltage of voltage regulation according to the voltage of voltage regulation, wherein the voltage of voltage regulation Voltage difference between one photovoltaic earth terminal of output end and the optical-electric module for the voltage-stablizer.
8. photovoltaic power supply system according to claim 5, it is characterised in that the detecting unit is further included：
One 3rd resistor, the first end of the 3rd resistor receives the reference voltage, and the second end coupling of the 3rd resistor Connect the input of the voltage-stablizer；And
One the 4th resistance, the second end of the first end coupling 3rd resistor of the 4th resistance, and the 4th resistance Second end couples the output end of the voltage-stablizer and the first end of the first resistor.
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CN104917413B (en) 2017-08-15
TWI565177B (en) 2017-01-01
TW201534035A (en) 2015-09-01
TW201534041A (en) 2015-09-01
CN104868770B (en) 2017-07-14
TWI565203B (en) 2017-01-01
CN104917414A (en) 2015-09-16
TWI548192B (en) 2016-09-01
CN204465376U (en) 2015-07-08
TW201534040A (en) 2015-09-01
TW201534039A (en) 2015-09-01
CN104917455A (en) 2015-09-16
CN104868767B (en) 2017-11-14
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TW201534031A (en) 2015-09-01
TW201534034A (en) 2015-09-01

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