CN107493057A - The electric regulating system and method for a kind of potential induction attenuation of photovoltaic generation - Google Patents

The electric regulating system and method for a kind of potential induction attenuation of photovoltaic generation Download PDF

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Publication number
CN107493057A
CN107493057A CN201710868238.XA CN201710868238A CN107493057A CN 107493057 A CN107493057 A CN 107493057A CN 201710868238 A CN201710868238 A CN 201710868238A CN 107493057 A CN107493057 A CN 107493057A
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China
Prior art keywords
circuit
output
voltage
pid
inverter
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CN201710868238.XA
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Chinese (zh)
Inventor
王运方
曹志峰
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Hongyi Technology Co.,Ltd.
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Beijing Apollo Ding Rong Solar Technology Co Ltd
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Priority to CN201710868238.XA priority Critical patent/CN107493057A/en
Publication of CN107493057A publication Critical patent/CN107493057A/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
    • H02S10/00PV power plants; Combinations of PV energy systems with other systems for the generation of electric power
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381Dispersed generators
    • H02J3/382Dispersed generators the generators exploiting renewable energy
    • H02J3/383Solar energy, e.g. photovoltaic energy
    • 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
    • H02S40/00Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
    • H02S40/30Electrical components
    • H02S40/32Electrical components comprising DC/AC inverter means associated with the PV module itself, e.g. AC modules
    • 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
    • H02S50/10Testing of PV devices, e.g. of PV modules or single PV cells
    • 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
    • Y02E10/56Power conversion systems, e.g. maximum power point trackers

Abstract

The present invention provides a kind of electric regulating system and method for the potential induction attenuation of photovoltaic generation, and the system includes:Photovoltaic array, inverter, PID dynamics suppression circuit and Alternating Current Unit.The output end of photovoltaic array is connected with the direct-flow input end of inverter, and the output end of inverter is connected with the input of Alternating Current Unit.The input of PID dynamic suppression circuits is connected with the direct-flow input end of inverter, and the output end of PID dynamic suppression circuits is connected with the bus midpoint N of inverter.PID dynamics suppression circuit is used for the voltage-to-ground for detecting the PV negative poles of inverter direct-flow input end in real time, and the voltage of the bus midpoint N according to the voltage-to-ground of PV negative poles regulation inverter, the voltage-to-ground of PV negative poles is more than zero.The present invention can intelligently suppress potential induction attenuation and the online income repaired the cell panel that potential induction attenuation occurs, increase photovoltaic generation.

Description

The electric regulating system and method for a kind of potential induction attenuation of photovoltaic generation
Technical field
The present invention relates to technical field of photovoltaic power generation, more particularly to a kind of electric tune of the potential induction attenuation of photovoltaic generation Save system and method.
Background technology
Solar energy is a kind of inexhaustible regenerative resource of mankind, it have spatter property, security, extensively The advantages that property, persistence, adequate, ease for maintenance and potential economy, there is important strategic position.Solar power generation is It is a kind of to make the emerging mode that regenerative resource is utilized.It is global at present after the fast-developing construction for the more than ten years of experienced over Between 200GW-300GW, photovoltaic solar power industry has been held the balance main as energy field for photovoltaic installed capacity Part.Photovoltaic solar industry is put into China emerging strategic industries field, and China leapt to light since 2014 The newly-increased installation amount first place in the world of volt, has reached a quarter of global photovoltaic generation total amount in 2015.Therefore, research is conciliate Certainly the particular problem of photovoltaic solar power industry has great practical significance.
Potential induction attenuation PID (Potential Induced Degradation) phenomenon refers in high temperature and humidity environment Under, high voltage flows through the phenomenon that solar battery cell will cause power output to decline, and is existing specific to solar cell As.In in the past few decades, component power is caused significantly to decay because system biases, some photovoltaic module decay are even super 50% is crossed, causes the degradation of photovoltaic generation power station income.
The content of the invention
The present invention provides a kind of electric regulating system and method for the potential induction attenuation of photovoltaic generation, solves existing photovoltaic The generation potential induction attenuation that generates electricity causes power output to decline, and can not intelligently suppress potential induction attenuation and repair online to occur The problem of cell panel of potential induction attenuation, the service life of photovoltaic power generation equipment can be improved, it is ensured that photovoltaic power generation equipment exports Stable power, it is effectively increased the income of photovoltaic generation.
To realize object above, the present invention provides following technical scheme:
A kind of electric regulating system of the potential induction attenuation of photovoltaic generation, including:Photovoltaic array, inverter, PID dynamics Suppression circuit and Alternating Current Unit;
The output end of the photovoltaic array is connected with the direct-flow input end of inverter, and direct current is provided for the inverter Source, the output end of the inverter are connected with the input of the Alternating Current Unit, and alternating current is provided for output power network;
The input of the PID dynamics suppression circuit is connected with the direct-flow input end of the inverter, and the PID dynamics press down The output end of circuit processed is connected with the bus midpoint N of the inverter;
The PID dynamics suppression circuit is used for the electric over the ground of the PV negative poles for detecting the inverter direct-flow input end in real time Pressure, and the voltage of the bus midpoint N according to the voltage-to-ground of the PV negative poles regulation inverter, make pair of the PV negative poles Ground voltage is more than zero.
Preferably, in addition to:PID improves circuit online;
The input that the PID improves circuit online is connected with the direct-flow input end of the inverter, and the PID changes online The output end of kind circuit is connected with the input of the photovoltaic array;
The PID improves circuit and is used for the output voltage according to each photovoltaic array and judges that the photovoltaic array is online No generation PID phenomenons, when the output voltage of the photovoltaic array is less than setting voltage threshold, if it is determined that the photovoltaic array Generation PID phenomenons, then when the inverter is stopped, the PID improves circuit and exported according to the output voltage online Dc source applies backward voltage to the cell panel that the photovoltaic array of PID phenomenons occurs, to repair the cell panel.
Preferably, in addition to:MCU;
The first output end of the MCU is connected with the control terminal of the PID dynamics suppression circuit, and the second of the MCU is defeated Go out to hold the control terminal for improving circuit online with the PID to be connected;
The MCU is used for the voltage for controlling the PID dynamics suppression circuit to export according to the voltage-to-ground of the PV negative poles Value;
The MCU is additionally operable to determine whether generation PID phenomenons according to the output voltage of the photovoltaic array, and described in control PID improves the magnitude of voltage of circuit output online.
Preferably, the PID dynamics suppression circuit includes:Voltage detecting circuit, PWM output circuits, adjustable DC source electricity Road and virtual ground circuit;
The input of the PWM output circuits is connected with the output end of the voltage detecting circuit, the PWM output circuits Output end be connected with the control terminal of the adjustable DC source circuit, the output end of the adjustable DC source circuit with it is described virtual The input of earthed circuit is connected;
Output end of the output end of the virtual ground circuit as the PID dynamics suppression circuit, the voltage detecting Output end of the input of circuit as the PID dynamics suppression circuit, described in the control terminals of the PWM output circuits is used as The control terminal of PID dynamic suppression circuits.
Preferably, the voltage detecting circuit includes:Pressure sampling circuit, operation amplifier modulate circuit and isolation optocoupler electricity Road;
The pressure sampling circuit carries out partial pressure sampling to the voltage of the photovoltaic array output end and exports high pressure detection Signal, the operation amplifier modulate circuit is amplified to the high pressure detection signal nurses one's health and is sent to the isolation optocoupler electricity Road, the isolation optocoupler circuit export low pressure detection signal after electrical isolation is carried out to the high pressure detection signal after conditioning.
Preferably, the adjustable DC source circuit uses reverse exciting topological structure, and the adjustable DC source circuit is according to institute State the alternating current regulation that the pwm signal that PWM output circuits export inputs public electric wire net and export the DC voltage for being 0~100V.
Preferably, the virtual ground circuit uses resistance Y-connection topological structure, and the virtual ground circuit includes: First resistor, second resistance and 3rd resistor;
One end of one end of the first resistor, one end of the second resistance and the 3rd resistor is connected in one Point, the output end as the virtual circuit;
The other end of the other end of the first resistor, the other end of the second resistance and the 3rd resistor respectively with Three live wires connection of the inverter output end, wherein, the first resistor, the second resistance and the 3rd resistor Resistance is equal.
Preferably, the PID dynamics suppression circuit also includes:Electric-leakage detection circuit;
The electric-leakage detection circuit is used to detect the bus midpoint N of inverter leakage current and is conveyed to described MCU, when the leakage current is more than setting electric current threshold value, the MCU reporting faults alarm signal, and perform interrupt processing journey Sequence.
Preferably, the PID improves circuit and included online:Signal generating circuit, controllable direct current power supply and switching circuit;
The input of the signal generating circuit improves the control terminal of circuit as the PID online, and the signal occurs The output end of circuit is connected with the control terminal of the controllable direct current power supply, the output end of the controllable direct current power supply and the switching The input of circuit is connected, and the output end of the switching circuit improves the output end of circuit as the PID online;
The MCU obtains the output voltage of the photovoltaic array by the PID dynamics suppression circuit, and when counting setting Interior average output voltage, if the average output voltage is less than setting voltage threshold, the MCU determines the photovoltaic PID phenomenons occur for array, and the MCU output control signals give the signal generating circuit, control the signal generating circuit The controllable direct current power supply output setting voltage, and the cell panel of the photovoltaic array is applied reversely by the switching circuit Voltage;
The switching circuit is used to switching being electrically connected for the photovoltaic array and the inverter or the controllable direct current power supply Connect.
Preferably, the control terminal of the switching circuit is connected with the 3rd output end of the MCU, and the MCU passes through described Switching circuit controls the photovoltaic array to be turned on or off with the inverter or the controllable direct current power supply.
The present invention also provides a kind of electric adjusting method of the potential induction attenuation of photovoltaic generation, including:
The voltage-to-ground of the PV negative poles of detection inverter direct-flow input end in real time;
The bus midpoint N of inverter voltage is adjusted according to the voltage-to-ground of the PV negative poles, makes the PV negative poles Voltage-to-ground be more than zero, so as to prevent photovoltaic array produce PID phenomenons.
Preferably, in addition to:
Detect the output voltage of each photovoltaic array;
If the output voltage is less than setting voltage threshold, judge that PID phenomenons occur for the photovoltaic array;
Dc source is exported according to the output voltage to apply anti-the cell panel that the photovoltaic array of PID phenomenons occurs To voltage, to repair the cell panel.
Preferably, in addition to:
Detect the bus midpoint N of inverter leakage current;
If the leakage current is more than setting electric current threshold value, reporting fault alarm signal, and performs interrupt processing journey Sequence.
The present invention provides a kind of electric regulating system and method for the potential induction attenuation of photovoltaic generation, by photovoltaic battle array The output voltage of row is detected, and the voltage of the bus midpoint N according to output voltage regulation inverter, makes the PV negative poles Voltage-to-ground is more than zero, so as to prevent photovoltaic array from producing PID phenomenons;Meanwhile determine the light always according to the output voltage Whether photovoltaic array occurs PID phenomenons, if it is, applying backward voltage to the cell panel of the photovoltaic array, to repair battery Plate.Solving existing photovoltaic generation generation potential induction attenuation causes power output to decline, and can not intelligently suppress potential induction and decline The problem of subtracting and repairing the cell panel that potential induction attenuation occurs online, the service life of photovoltaic power generation equipment can be improved, it is ensured that The stable power of photovoltaic power generation equipment output, it is effectively increased the income of photovoltaic generation.
Brief description of the drawings
In order to illustrate more clearly of the specific embodiment of the present invention, the required accompanying drawing used in embodiment will be made below Simply introduce.
Fig. 1:It is a kind of electric regulating system schematic diagram of the potential induction attenuation of photovoltaic generation provided by the invention;
Fig. 2:It is a kind of virtual ground circuit schematic diagram provided in an embodiment of the present invention;
Fig. 3:It is a kind of electric adjusting method flow chart of the potential induction attenuation of photovoltaic generation provided by the invention.
Reference
11 photovoltaic arrays
12 PID dynamic suppression circuits
Embodiment
In order that those skilled in the art more fully understand the scheme of the embodiment of the present invention, below in conjunction with the accompanying drawings and implement Mode is described in further detail to the embodiment of the present invention.
PID phenomenons are also easy to produce for current photovoltaic generation, cause generating system equipment power drop, income cost to reduce. The present invention provides a kind of electric regulating system and method for the potential induction attenuation of photovoltaic generation, solves the above problems, can improve The service life of photovoltaic power generation equipment, it is ensured that the stable power of photovoltaic power generation equipment output, be effectively increased the income of photovoltaic generation.
As shown in figure 1, a kind of electric regulating system of the potential induction attenuation of photovoltaic generation, including:It is photovoltaic array 11, inverse Become device, PID dynamics suppression circuit 12 and Alternating Current Unit.The output end of the photovoltaic array 11 and the direct current of inverter input End is connected, and dc source, the output end of the inverter and the input of the Alternating Current Unit are provided for the inverter It is connected, alternating current is provided for output power network.The input of the PID dynamics suppression circuit 12 inputs with the direct current of the inverter End is connected, and the output end of the PID dynamics suppression circuit 12 is connected with the bus midpoint N of the inverter.The PID dynamics press down Circuit 12 processed is used for the voltage-to-ground for detecting the PV negative poles of the inverter direct-flow input end in real time, and according to the PV negative poles Voltage-to-ground adjusts the bus midpoint N of inverter voltage, the voltage-to-ground of the PV negative poles is more than zero, so as to prevent The generation of PID phenomenons.
Specifically, by injecting DC voltage between the bus midpoint N and photovoltaic array PE of inverter, so as to improve battery Plate PV- voltage-to-grounds, reach the purpose for reducing PID decay.PV by PID dynamics suppression circuit to inverter direct-flow input end Negative pole voltage-to-ground is monitored in real time, and adjusts the bus of inverter to adjustable DC source circuit according to PV negative poles voltage-to-ground Midpoint N voltage.It is connected to because of the bus midpoint N and photovoltaic array PE of inverter, therefore is controlled and adjusted by such a closed-loop dynamic Section, can finally make PV negative pole voltage-to-grounds be consistently greater than zero, can effectively suppress the generation of potential induction attenuation, increase solar energy Generate electricity.
Further, the system also includes:PID improves circuit online, the PID improve online the input of circuit with it is described The direct-flow input end of inverter is connected, and the output end that the PID improves circuit online is connected with the input of the photovoltaic array. The PID improves circuit and is used for the output voltage according to each photovoltaic array and judges whether the photovoltaic array occurs online PID phenomenons, when the output voltage of the photovoltaic array is less than setting voltage threshold, if it is determined that the photovoltaic array occurs PID phenomenons, then when the inverter is stopped, the PID improves circuit and exports direct current according to the output voltage online Power supply applies backward voltage to the cell panel that the photovoltaic array of PID phenomenons occurs, to repair the cell panel.
Specifically, using photovoltaic solar cell potential induction attenuation part it is reversible the characteristics of, by stopping in inverter During work (when such as night, irradiation level are low), backward voltage is applied to photovoltaic battery panel using independent DC source, it is intermittent to repair The multiple cell panel that PID phenomenons occur on daytime.The PID improve online circuit by with inverter and PID dynamic suppression circuits 12 progress data communications, collection simultaneously count the information such as the history operating voltage of each photovoltaic array, electric current, temperature, so as to preliminary Judge whether photovoltaic array occurs PID phenomenons, if it is determined to be directed to each photovoltaic according to the output voltage of photovoltaic array The size and activationary time of the activation magnitude of voltage of array, to realize the reparation to cell panel.
The system also includes:MCU, the MCU the first output end and the control terminal phase of the PID dynamics suppression circuit Even, the second output end of the MCU improves the control terminal of circuit with the PID and is connected online.The MCU is used for according to the PV The voltage-to-ground of negative pole controls the magnitude of voltage of the PID dynamics suppression circuit output.The MCU is additionally operable to according to the photovoltaic battle array The output voltage of row determines whether PID phenomenons occur, and controls the PID to improve the magnitude of voltage of circuit output online.
In actual applications, the MCU includes:AD conversion unit, microprocessor and D/A conversion unit, micro- place The input of reason device is connected with the output end of the AD conversion unit, the output end of the microprocessor and the digital-to-analogue conversion The input of unit is connected, the input of the input of the AD conversion unit as MCU, the D/A conversion unit it is defeated Go out output end of the end as MCU.
Further, the PID dynamics suppression circuit 12 includes:Voltage detecting circuit, PWM output circuits, adjustable DC source Circuit and virtual ground circuit.The input of the PWM output circuits is connected with the output end of the voltage detecting circuit, described The output end of PWM output circuits is connected with the control terminal of the adjustable DC source circuit, the output of the adjustable DC source circuit End is connected with the input of the virtual ground circuit.The output end of the virtual ground circuit suppresses as PID dynamics The output end of circuit 12, the output end of the input of the voltage detecting circuit as the PID dynamics suppression circuit 12 are described Control terminal of the control terminal of PWM output circuits as the PID dynamics suppression circuit 12.
Further, the voltage detecting circuit includes:Pressure sampling circuit, operation amplifier modulate circuit and isolation optocoupler Circuit.The pressure sampling circuit carries out partial pressure sampling to the voltage of the photovoltaic array output end and exports high pressure detection letter Number, the operation amplifier modulate circuit is amplified to the high pressure detection signal nurses one's health and is sent to the isolation optocoupler electricity Road, the isolation optocoupler circuit export low pressure detection signal after electrical isolation is carried out to the high pressure detection signal after conditioning.
It should be noted that the voltage detecting circuit detection object is high-voltage dc voltage, and range 0 to 1000V, electricity Road need to use isolation design.
The adjustable DC source circuit uses reverse exciting topological structure, and the adjustable DC source circuit is defeated according to the PWM Go out the DC voltage of alternating current regulation output that the pwm signal of circuit output inputs public electric wire net for 0~100V.
In actual applications, adjustable DC source circuit often includes power switch design, can realize straight-adjustable using metal-oxide-semiconductor The control terminal of source current is flowed, pwm signal is passed through the grid of metal-oxide-semiconductor to control the friendship that adjustable DC power circuit input accesses The break-make of electricity is flowed, the magnitude of voltage of regulation adjustable DC source circuit output is realized by controlling the dutycycle of pwm signal.
As shown in Fig. 2 the virtual ground circuit uses resistance Y-connection topological structure, the virtual ground circuit bag Include:First resistor, second resistance and 3rd resistor.One end of the first resistor, one end of the second resistance and described One end of three resistance is connected in a bit, the output end as the virtual circuit.The other end of the first resistor, described The other end of two resistance and the other end of the 3rd resistor are connected with three live wires of the inverter output end respectively, its In, the resistance of the first resistor, the second resistance and the 3rd resistor is equal.
The PID dynamics suppression circuit 12 also includes:Electric-leakage detection circuit, the electric-leakage detection circuit are described for detecting The bus midpoint N of inverter leakage current is simultaneously conveyed to the MCU, when the leakage current is more than setting electric current threshold value, The MCU reporting faults alarm signal, and perform interrupt handling routine.
In actual applications, electric-leakage detection circuit can detect leakage current using TYPE-B type Hall components, meanwhile, MCU is compared the leakage current and setting electric current threshold value by AD conversion unit acquisition testing leakage current size Compared with, detection and warning function are realized, meanwhile, MCU can also call Port interrupts service routine according to fault-signal, realize system Software function, such as:Close the various functions such as inverter, renewal Status Flag, the unlatching of drive circuit protection circuit.
The PID improves circuit online to be included:Signal generating circuit, controllable direct current power supply and switching circuit.The signal The input of circuit occurs improves the control terminal of circuit, the output end of the signal generating circuit and institute as the PID online The control terminal for stating controllable direct current power supply is connected, the input phase of the output end of the controllable direct current power supply and the switching circuit Even, the output end of the switching circuit improves the output end of circuit as the PID online.The MCU passes through PID dynamics Suppression circuit obtains the output voltage of the photovoltaic array, and counts the average output voltage in setting time, if described flat Equal output voltage is less than setting voltage threshold, then the MCU determines that PID phenomenons, the MCU outputs control occur for the photovoltaic array Signal processed gives the signal generating circuit, the signal generating circuit is controlled the controllable direct current power supply output setting voltage, And backward voltage is applied to the cell panel of the photovoltaic array by the switching circuit.The switching circuit is described for switching The electrical connection of photovoltaic array and the inverter or the controllable direct current power supply.
In actual applications, controllable direct current power supply using boosting isolation design, output voltage range 400~1100V it Between.Rectification is carried out using the alternating current of public electric wire net and produces high voltage direct current potential source, to the possible photovoltaic solar group that decayed Part carries out voltage compensation.
Further, the control terminal of the switching circuit is connected with the 3rd output end of the MCU, and the MCU passes through described Switching circuit controls the photovoltaic array to be turned on or off with the inverter or the controllable direct current power supply.
It can be seen that the present invention provides a kind of electric regulating system of the potential induction attenuation of photovoltaic generation, pressed down by PID dynamics Circuit processed detects to the output voltage of photovoltaic array, and the voltage of the bus midpoint N according to output voltage regulation inverter, The voltage-to-ground of the PV negative poles is set to be more than zero, so as to prevent photovoltaic array from producing PID phenomenons;Meanwhile also changed online by PID Kind circuit determines whether the photovoltaic array occurs PID phenomenons according to the output voltage, if it is, to the photovoltaic array Cell panel apply backward voltage, to repair cell panel.Solve existing photovoltaic generation generation potential induction attenuation and cause output work Rate declines, and can not intelligently suppress potential induction attenuation and online the problem of repairing the cell panel that potential induction attenuation occurs, can Improve the service life of photovoltaic power generation equipment, it is ensured that the stable power of photovoltaic power generation equipment output, be effectively increased photovoltaic generation Income.
As shown in figure 3, the present invention also provides a kind of electric adjusting method of the potential induction attenuation of photovoltaic generation, including with Lower step:
S1:The voltage-to-ground of the PV negative poles of detection inverter direct-flow input end in real time;
S2:The bus midpoint N of inverter voltage is adjusted according to the voltage-to-ground of the PV negative poles, bears the PV The voltage-to-ground of pole is more than zero, so as to prevent photovoltaic array from producing PID phenomenons.
Further, this method also includes:
S3:Detect the output voltage of each photovoltaic array;
S4:If the output voltage is less than setting voltage threshold, judge that PID phenomenons occur for the photovoltaic array;
S5:Dc source is exported according to the output voltage to apply the cell panel that the photovoltaic array of PID phenomenons occurs Add backward voltage, to repair the cell panel.
Further, in addition to:
S6:Detect the bus midpoint N of inverter leakage current;
S7:If the leakage current is more than setting electric current threshold value, reporting fault alarm signal, and performs interrupt processing Program.
It can be seen that the present invention provides a kind of electric adjusting method of the potential induction attenuation of photovoltaic generation, by photovoltaic battle array The output voltage of row is detected, and the voltage of the bus midpoint N according to output voltage regulation inverter, makes the PV negative poles Voltage-to-ground is more than zero, so as to prevent photovoltaic array from producing PID phenomenons;Meanwhile determine the light always according to the output voltage Whether photovoltaic array occurs PID phenomenons, if it is, applying backward voltage to the cell panel of the photovoltaic array, to repair battery Plate.Solving existing photovoltaic generation generation potential induction attenuation causes power output to decline, and can not intelligently suppress potential induction and decline The problem of subtracting and repairing the cell panel that potential induction attenuation occurs online, the service life of photovoltaic power generation equipment can be improved, it is ensured that The stable power of photovoltaic power generation equipment output, it is effectively increased the income of photovoltaic generation.
Construction, feature and the action effect of the present invention, above institute is described in detail according to diagrammatically shown embodiment above Only presently preferred embodiments of the present invention is stated, but the present invention is not to limit practical range shown in drawing, it is every according to structure of the invention Want made change, or be revised as the equivalent embodiment of equivalent variations, when still without departing from specification and illustrating covered spirit, All should be within the scope of the present invention.

Claims (13)

  1. A kind of 1. electric regulating system of the potential induction attenuation of photovoltaic generation, it is characterised in that including:Photovoltaic array, inversion Device, PID dynamics suppression circuit and Alternating Current Unit;
    The output end of the photovoltaic array is connected with the direct-flow input end of inverter, provides dc source for the inverter, institute The output end for stating inverter is connected with the input of the Alternating Current Unit, and alternating current is provided for output power network;
    The input of the PID dynamics suppression circuit is connected with the direct-flow input end of the inverter, and the PID dynamics suppress electricity The output end on road is connected with the bus midpoint N of the inverter;
    The PID dynamics suppression circuit is used for the voltage-to-ground for detecting the PV negative poles of the inverter direct-flow input end in real time, and The bus midpoint N of inverter voltage is adjusted according to the voltage-to-ground of the PV negative poles, makes the electric over the ground of the PV negative poles Pressure is more than zero.
  2. 2. the electric regulating system of the potential induction attenuation of photovoltaic generation according to claim 1, it is characterised in that also wrap Include:PID improves circuit online;
    The input that the PID improves circuit online is connected with the direct-flow input end of the inverter, and the PID improves electricity online The output end on road is connected with the input of the photovoltaic array;
    The PID improves circuit and is used for the output voltage according to each photovoltaic array and judges whether the photovoltaic array is sent out online Raw PID phenomenons, when the output voltage of the photovoltaic array is less than setting voltage threshold, if it is determined that the photovoltaic array occurs PID phenomenons, then when the inverter is stopped, the PID improves circuit and exports direct current according to the output voltage online Power supply applies backward voltage to the cell panel that the photovoltaic array of PID phenomenons occurs, to repair the cell panel.
  3. 3. the electric regulating system of the potential induction attenuation of photovoltaic generation according to claim 2, it is characterised in that also wrap Include:MCU;
    The first output end of the MCU is connected with the control terminal of the PID dynamics suppression circuit, the second output end of the MCU The control terminal for improving circuit online with the PID is connected;
    The MCU is used for the magnitude of voltage for controlling the PID dynamics suppression circuit to export according to the voltage-to-ground of the PV negative poles;
    The MCU is additionally operable to be determined whether PID phenomenons occur according to the output voltage of the photovoltaic array, and controls the PID The online magnitude of voltage for improving circuit output.
  4. 4. the electric regulating system of the potential induction attenuation of photovoltaic generation according to claim 3, it is characterised in that described PID dynamic suppression circuits include:Voltage detecting circuit, PWM output circuits, adjustable DC source circuit and virtual ground circuit;
    The input of the PWM output circuits is connected with the output end of the voltage detecting circuit, the PWM output circuits it is defeated Go out end with the control terminal of the adjustable DC source circuit to be connected, output end and the virtual ground of the adjustable DC source circuit The input of circuit is connected;
    Output end of the output end of the virtual ground circuit as the PID dynamics suppression circuit, the voltage detecting circuit Output end of the input as the PID dynamics suppression circuit, the control terminal of the PWM output circuits moves as the PID The control terminal of state suppression circuit.
  5. 5. the electric regulating system of the potential induction attenuation of photovoltaic generation according to claim 4, it is characterised in that described Voltage detecting circuit includes:Pressure sampling circuit, operation amplifier modulate circuit and isolation optocoupler circuit;
    The pressure sampling circuit carries out partial pressure sampling to the voltage of the photovoltaic array output end and exports high pressure detection signal, The operation amplifier modulate circuit is amplified to the high pressure detection signal and nurses one's health and be sent to the isolation optocoupler circuit, institute State after isolation optocoupler circuit carries out electrical isolation to the high pressure detection signal after conditioning and export low pressure detection signal.
  6. 6. the electric regulating system of the potential induction attenuation of photovoltaic generation according to claim 5, it is characterised in that described Adjustable DC source circuit uses reverse exciting topological structure, and the adjustable DC source circuit exports according to the PWM output circuits The DC voltage that the alternating current regulation output that pwm signal inputs public electric wire net is 0~100V.
  7. 7. the electric regulating system of the potential induction attenuation of photovoltaic generation according to claim 6, it is characterised in that described Virtual ground circuit uses resistance Y-connection topological structure, and the virtual ground circuit includes:First resistor, second resistance and 3rd resistor;
    One end of one end of the first resistor, one end of the second resistance and the 3rd resistor is connected in a bit, is made For the output end of the virtual circuit;
    The other end of the other end of the first resistor, the other end of the second resistance and the 3rd resistor respectively with it is described Three live wires connection of inverter output end, wherein, the resistance of the first resistor, the second resistance and the 3rd resistor It is equal.
  8. 8. the electric regulating system of the potential induction attenuation of photovoltaic generation according to claim 7, it is characterised in that described PID dynamic suppression circuits also include:Electric-leakage detection circuit;
    The electric-leakage detection circuit is used to detect the bus midpoint N of inverter leakage current and is conveyed to the MCU, When the leakage current is more than setting electric current threshold value, the MCU reporting faults alarm signal, and perform interrupt handling routine.
  9. 9. the electric regulating system of the potential induction attenuation of photovoltaic generation according to claim 8, it is characterised in that described PID improves circuit online to be included:Signal generating circuit, controllable direct current power supply and switching circuit;
    The input of the signal generating circuit improves the control terminal of circuit, the signal generating circuit as the PID online Output end be connected with the control terminal of the controllable direct current power supply, the output end of the controllable direct current power supply and the switching circuit Input be connected, the output end of the switching circuit improves the output end of circuit as the PID online;
    The MCU obtains the output voltage of the photovoltaic array by the PID dynamics suppression circuit, and counts in setting time Average output voltage, if the average output voltage is less than setting voltage threshold, the MCU determines the photovoltaic array Generation PID phenomenons, the MCU output control signals give the signal generating circuit, make described in the signal generating circuit control Controllable direct current power supply output setting voltage, and reversely electricity is applied to the cell panel of the photovoltaic array by the switching circuit Pressure;
    The switching circuit is used for the electrical connection for switching the photovoltaic array and the inverter or the controllable direct current power supply.
  10. 10. the electric regulating system of the potential induction attenuation of photovoltaic generation according to claim 9, it is characterised in that institute State the control terminal of switching circuit with the 3rd output end of the MCU to be connected, the MCU controls the light by the switching circuit Photovoltaic array is turned on or off with the inverter or the controllable direct current power supply.
  11. A kind of 11. electric adjusting method of the potential induction attenuation of photovoltaic generation, it is characterised in that including:
    The voltage-to-ground of the PV negative poles of detection inverter direct-flow input end in real time;
    The bus midpoint N of inverter voltage is adjusted according to the voltage-to-ground of the PV negative poles, makes pair of the PV negative poles Ground voltage is more than zero, so as to prevent photovoltaic array from producing PID phenomenons.
  12. 12. the electric adjusting method of the potential induction attenuation of photovoltaic generation according to claim 11, it is characterised in that also Including:
    Detect the output voltage of each photovoltaic array;
    If the output voltage is less than setting voltage threshold, judge that PID phenomenons occur for the photovoltaic array;
    Dc source is exported according to the output voltage reversely electricity is applied to the cell panel that the photovoltaic array of PID phenomenons occurs Pressure, to repair the cell panel.
  13. 13. the electric adjusting method of the potential induction attenuation of photovoltaic generation according to claim 12, it is characterised in that also Including:
    Detect the bus midpoint N of inverter leakage current;
    If the leakage current is more than setting electric current threshold value, reporting fault alarm signal, and performs interrupt handling routine.
CN201710868238.XA 2017-09-22 2017-09-22 The electric regulating system and method for a kind of potential induction attenuation of photovoltaic generation Pending CN107493057A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109638808A (en) * 2018-12-21 2019-04-16 华为数字技术(苏州)有限公司 Compensation circuit, method, power module and the photovoltaic system of potential induction attenuation
CN110426601A (en) * 2019-08-22 2019-11-08 金华电力设计院有限公司 A kind of Fault Locating Method of earth-free photovoltaic system
CN110867900A (en) * 2019-12-11 2020-03-06 阳光电源股份有限公司 Wind-solar hybrid power generation system
CN110912195A (en) * 2019-12-11 2020-03-24 阳光电源股份有限公司 Wind-solar hybrid power generation system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109638808A (en) * 2018-12-21 2019-04-16 华为数字技术(苏州)有限公司 Compensation circuit, method, power module and the photovoltaic system of potential induction attenuation
CN110426601A (en) * 2019-08-22 2019-11-08 金华电力设计院有限公司 A kind of Fault Locating Method of earth-free photovoltaic system
CN110867900A (en) * 2019-12-11 2020-03-06 阳光电源股份有限公司 Wind-solar hybrid power generation system
CN110912195A (en) * 2019-12-11 2020-03-24 阳光电源股份有限公司 Wind-solar hybrid power generation system

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