CN101847876A - Three-phase photovoltaic grid connected inverter system - Google Patents

Three-phase photovoltaic grid connected inverter system Download PDF

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Publication number
CN101847876A
CN101847876A CN201010188151A CN201010188151A CN101847876A CN 101847876 A CN101847876 A CN 101847876A CN 201010188151 A CN201010188151 A CN 201010188151A CN 201010188151 A CN201010188151 A CN 201010188151A CN 101847876 A CN101847876 A CN 101847876A
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China
Prior art keywords
circuit
inverter
output
control
photovoltaic grid
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CN201010188151A
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张朝海
金志辉
高立颖
栾天
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University of Shanghai for Science and Technology
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University of Shanghai for Science and Technology
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Priority to CN201010188151A priority Critical patent/CN101847876A/en
Publication of CN101847876A publication Critical patent/CN101847876A/en
Pending legal-status Critical Current

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    • 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
    • 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
    • Y02E40/00Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/70Smart grids as climate change mitigation technology in the energy generation sector
    • 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
    • Y04S10/12Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation
    • Y04S10/123Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation the energy generation units being or involving renewable energy sources

Abstract

The invention relates to a three-phase photovoltaic grid connected inverter system. The three-phase photovoltaic grid connected inverter system comprises a DC/DC converting circuit which takes a photovoltaic array as an input power source, a Z source network, a DC/AC converting circuit which converts direct current (DC) into alternating current (AC), and a control circuit of the DC/DC converting circuit and the DC/AC converting circuit, wherein an output end of the DC/AC circuit is merged into an electric network; the control circuit takes a TMS320F2812 as a digital control system; and a closed-loop control system is formed by using various sensors and the digital control system based on the TMS320F2812. The three-phase photovoltaic grid connected inverter system can be applied to photovoltaic power generation systems, and can greatly improve the power generation efficiency of the photovoltaic systems, reduce the cost, output stable current with less harmonic content, and ensure safe and normal operation of the electric network.

Description

A kind of three-phase photovoltaic grid connected inverter system
Technical field
The present invention relates to a kind of power inverter technology, particularly a kind of three-phase photovoltaic grid connected inverter system.
Background technology
Serious day by day along with world energy sources shortage and problem of environmental pollution, the energy, environment and development have become world today's problem demanding prompt solution.Development and use regenerative resource and various green energy resource more and more are subjected to showing great attention to of various countries, the world today, to realize sustainable development.Solar energy is obtaining application more and more widely as a kind of cleaning, non-pollution of renewable energy, for alleviating the energy and problem of environmental pollution, has important in theory and realistic meaning.
The output characteristic curve of solar-energy photo-voltaic cell is subject to the influence of external factor such as intensity of illumination, temperature, and the transfer ratio of photovoltaic cell is relatively low and cost than higher, therefore, normally move for power output that improves photovoltaic generating system and the safety that guarantees electrical network, must utilize power electronic technology and control technology that photovoltaic generating system is controlled.
The research of three-phase photovoltaic grid connected inverter system relates to a lot of critical technology, such as the selection of selection, controller and the control mode of the selection of DC/DC translation circuit topological structure, Z source network circuit, DC/AC circuit topological structure, detection of island effect etc.
DC/DC translation circuit topological structure: the switching device that uses mainly contains MOSFET, IGBT and diode etc. at present.Basic circuit topological structure has Buck translation circuit, Boost translation circuit, Buck-Boost translation circuit, Cuk translation circuit, single-ended reverse exciting translation circuit.
DC/AC translation circuit topological structure: the power device that uses mainly contains IGBT, MOSFET etc. at present.The circuit that power device constitutes has half control type, full-control type circuit.
Controller and control mode: the controller of inverter adopts special-purpose chip TMS 320 F 2812 to produce the PWM control wave, realizes detecting by analog circuit realization driving and transducer.Control mode adopts based on the maximal power tracing method of artificial neural net and SVPWM and realizes being incorporated into the power networks control, the maximum power point of accurate tracking solar photovoltaic battery output, and the alternating current of inverter output and the same same-phase frequently of voltage on line side, THD is less with the time-harmonic wave rate.Island effect is the problem that must solve in the photovoltaic parallel in system.
Summary of the invention
The present invention be directed to the problem of present photovoltaic generating system operational efficiency and fail safe, proposed a kind of three-phase photovoltaic grid connected inverter system, in office when according under intensity and the temperature conditions, effective tracking solar photovoltaic battery Maximum Power Output point; The alternating current of DC/AC inverter output and voltage on line side are with the frequency same-phase, and harmonic wave rate THD is less; Telecommunication monitoring system and display unit are to on-site data gathering, processing, storage and inquiry; Realize the testing circuit of island effect.
Technical scheme of the present invention is: a kind of three-phase photovoltaic grid connected inverter system, comprise the DC/DC circuit, Z source network circuit, the DC/AC circuit, control circuit, long-distance communication circuit and display unit, alone island detection system, photovoltaic array output both positive and negative polarity connects the DC/DC circuit input end, control circuit comprises the control module that is incorporated into the power networks, the MPPT control module, data acquisition module, sensor acquisition photovoltaic array analog signal and inverter output signal, after the AD conversion of data acquisition module process and handling, send into the MPPT control module and output a control signal to the DC/DC circuit, send into the control module that is incorporated into the power networks simultaneously and output a control signal to the DC/AC circuit, the DC/DC circuit is connected by Z source network circuit with the DC/AC circuit is middle, control circuit output connects long-distance communication circuit and display unit, DC/AC circuit output end alone island detection system in parallel.
Described Z source network circuit comprises two inductance and two electric capacity, and two inductance directly are connected across DC/DC circuit and two input/output terminals of DC/AC circuit, and two electric capacity insert DC/DC circuit and two input/output terminals of DC/AC circuit with X-shaped.
The full-bridge circuit that described DC/AC circuit adopts the IGBT power device to constitute.
Described control circuit adopts the numerical control system based on special control chip TMS320F2812.
Described long-distance communication circuit and display unit are modulated into analog signal to the digital signal of output, send to receiving terminal by telephone wire or wireless network, the modulator-demodulator of receiving terminal is demodulated to digital signal with analog signal again, and receiving terminal is handled the digital signal of receiving, and is shown.
Described alone island detection system adds protection switch between RLC load in parallel and the electrical network between combining inverter and RLC load in parallel.
Beneficial effect of the present invention is: three-phase photovoltaic grid connected inverter system of the present invention, the maximal power tracing of realization solar panel; The DC power inverter that solar cell is sent becomes to meet the AC alternating current of the standard of being incorporated into the power networks; Telecommunication monitoring system and display unit realize collection, processing, storage, inquiry and the demonstration of teledata; The data variation and the feature of island detection generation island effect are in time implemented safeguard measure.Improving the power output of photovoltaic generating system and the safety of assurance electrical network normally moves.
Description of drawings
Fig. 1 is a three-phase photovoltaic grid connected inverter system schematic diagram of the present invention;
Fig. 2 is circuit connection diagram in the three-phase photovoltaic grid connected inverter system of the present invention;
Fig. 3 is Z source converter topology diagram in the three-phase photovoltaic grid connected inverter system of the present invention;
Fig. 4 is three-phase photovoltaic grid connected inverter system medium-long range communication monitoring of the present invention and display unit figure;
Fig. 5 is the power supply state when in the three-phase photovoltaic grid connected inverter system of the present invention island effect taking place;
Fig. 6 detects schematic diagram for island effect in the three-phase photovoltaic grid connected inverter system of the present invention.
Embodiment
Based on the three-phase photovoltaic grid-connected inverting device in Z source, as shown in Figures 1 to 4, comprise DC/DC circuit, Z source network circuit, DC/AC circuit, control circuit, long-distance communication circuit and display unit, alone island detection system.
Among Fig. 2, the DC/DC translation circuit adopts the Buck-Boost converter.The inductance of Buck converter is sufficiently large, could reduce the ripple fluctuation of load current; Even and that how its inductance of Boost converter is done is big, output current is all pulsed.Both topologys are combined, removed the passive switch among the Buck, remove the active switch among the Boost, just can constitute buck (Buck-Boost) converter.It is that a kind of output voltage both can be higher than the non-isolated DC converter of the single tube that also can be lower than input voltage.The polarity that is not both output voltage of Buck-Boost translation circuit and the above two maximums is opposite with the polarity of input voltage, and input current and output current are all pulsed, but because the effect of filter capacitor, load current is a continous-stable.The output DC+, the DC-that are input as the solar energy photovoltaic array of this circuit are mainly used in the DC electric power that the solar energy photovoltaic array is sent and carry out conversion, finish the tracking of maximum power, realize the photovoltaic generating system Maximum Power Output.The output voltage of photovoltaic array and electric current are by current/voltage sensor acquisition analog signal, and temperature by illumination temperature sensor acquisition intensity of illumination and photovoltaic array outer surface, send into the MPPT control module through AD converter, control module is handled image data, produce current MPPT maximum power point tracking control PWM ripple according to result, the action of output PWM ripple driving switch pipe, change the input voltage Vi of Buck-Boost circuit, be the output voltage V pv of photovoltaic array, itself and the pairing voltage of photovoltaic array maximum power point are complementary, thereby make photovoltaic array Maximum Power Output all the time.
Among Fig. 3, the Z source network comprises the X-shaped that the two end control networks of inductance L 1, L2 and capacitor C 1, C2 are connected into, and so that a Z source to be provided, DC/DC converter and DC/AC converter is linked together.The maximum of Z source network is to allow instantaneous open circuit of inverter bridge and short circuit with characteristics uniqueness, and this boosts as required for converter main circuit or step-down provides a kind of mechanism.The Z source network provides huge flexibility for power supply, main circuit and load, and the power supply of inverter both can be voltage source, also can be current source.The output that is input as the DC/DC translation circuit of this circuit.
Among Fig. 2, the full-bridge circuit that the DC/AC translation circuit adopts the IGBT power device to constitute mainly is the AC electric power that the DC power conversions is become to meet the standard of being incorporated into the power networks, and is input as the output of Z source network.The break-make of its power device of PWM Waveform Control that produces by control circuit, thus realize being incorporated into the power networks control.
Among Fig. 2, control circuit adopts the control circuit based on special integrated circuit TMS320F2812, voltage, electric current, the electric current of grid side, the voltage partly exported by surface temperature, intensity of sunshine, output dc voltage, output DC stream, the inversion of various sensor acquisition solar energy photovoltaic arrays.By the analog signal logic analysis of the surface temperature of the photovoltaic cell gathered, intensity of sunshine, direct voltage, direct current is calculated, output PWM ripple control DC/DC translation circuit break-make, so that the photovoltaic array output services are in the maximum power voltage of maximum power point correspondence, thereby finish maximal power tracing, the algorithm of this process adopts the maximal power tracing method based on neural net; Gather voltage, electric current, the electric current of grid side, voltage analog signal that inversion is partly exported, change through AD converter, give the control module analyzing and processing that is incorporated into the power networks then, produce corresponding pwm pulse control wave, the break-make of the inversion full-bridge that constitutes with PWM ripple power controlling device, the electric current of inverter output and the voltage of grid side are with the frequency same-phase.
Among Fig. 4, telecommunication surveillance and display unit, promptly respectively install a Modem additional at the communication two ends, Modem is modulated into analog signal to the digital signal of output, send to receiving terminal by telephone wire or wireless network, the modulator-demodulator of receiving terminal is demodulated to digital signal with analog signal again, and receiving terminal is handled the digital signal of receiving, and is shown.
Telecommunication monitoring system and display unit are mainly used in data acquisition, processing, storage, inquiry and demonstration.Gather the signals such as electrical quantity, the accumulative total electric energy of feed-in electrical network, the input of combining inverter, the electrical quantity that is incorporated into the power networks and global solar radiation of solar energy photovoltaic array output.The data of gathering draw best run signal through data processing, add in the database, in order to inquiry.Can show simultaneously on-the-spot service data in real time, enter each observation interface.Sometimes, can give on-the-spot control module center, realize the power output maximum of photovoltaic generating system, operation of power networks the best by the optimum operation information that telecommunication draws processing.
Among Fig. 5, when electrical network need have a power failure when safeguarding, when island effect took place, self-holding supply network will endanger and maintenance personal's safety.This is practical according to the reason of island effect generation and the characteristics of corresponding detecting method and electrical network and normal load, uses initiatively and the method detection method of passive combination, thus accurate detection isolated island phenomenon.
As Fig. 6, be used to detect combining inverter island effect schematic diagram, form by photovoltaic combining inverter, electrical network, RLC load in parallel and inverter side switch S 1 and grid side switch S 2.Wherein the A point is the point of common coupling of combining inverter and electrical network, V PvFor the voltage at A place is the output end voltage of combining inverter, P PvAnd Q PvBe respectively the active power and the reactive power of combining inverter output, Δ P and Δ Q be the active power and the reactive power that provide of Russia's day electrical network respectively, and the active power and the reactive power of loading demand are respectively P LoadAnd Q Load, rlc circuit is represented partial load.During the grid-connected system outage,, then can cause the variation of output voltage if system can not provide load needed active power.The phase difference of system requirements grid-connected current and line voltage is (being unity power factor), and at this moment system's output frequency can change.Detect and judge whether to take place island effect by overvoltage, under-voltage detection and mistake high-frequency, mistake low frequency.When detecting the island effect generation, disconnect S2 earlier, disconnect S1 then, just guaranteed the safe operation of electrical network.

Claims (6)

1. three-phase photovoltaic grid connected inverter system, it is characterized in that, comprise the DC/DC circuit, Z source network circuit, the DC/AC circuit, control circuit, long-distance communication circuit and display unit, alone island detection system, photovoltaic array output both positive and negative polarity connects the DC/DC circuit input end, control circuit comprises the control module that is incorporated into the power networks, the MPPT control module, data acquisition module, sensor acquisition photovoltaic array analog signal and inverter output signal, after the AD conversion of data acquisition module process and handling, send into the MPPT control module and output a control signal to the DC/DC circuit, send into the control module that is incorporated into the power networks simultaneously and output a control signal to the DC/AC circuit, the DC/DC circuit is connected by Z source network circuit with the DC/AC circuit is middle, control circuit output connects long-distance communication circuit and display unit, DC/AC circuit output end alone island detection system in parallel.
2. according to the described three-phase photovoltaic grid connected inverter system of claim 1, it is characterized in that, described Z source network circuit comprises two inductance and two electric capacity, two inductance directly are connected across DC/DC circuit and two input/output terminals of DC/AC circuit, and two electric capacity insert DC/DC circuit and two input/output terminals of DC/AC circuit with X-shaped.
3. according to the described three-phase photovoltaic grid connected inverter system of claim 1, it is characterized in that the full-bridge circuit that described DC/AC circuit adopts the IGBT power device to constitute.
4. according to the described three-phase photovoltaic grid connected inverter system of claim 1, it is characterized in that described control circuit adopts the numerical control system based on special control chip TMS320F2812.
5. according to the described three-phase photovoltaic grid connected inverter system of claim 1, it is characterized in that, described long-distance communication circuit and display unit are modulated into analog signal to the digital signal of output, send to receiving terminal by telephone wire or wireless network, the modulator-demodulator of receiving terminal is demodulated to digital signal with analog signal again, receiving terminal is handled the digital signal of receiving, and is shown.
6. according to the described three-phase photovoltaic grid connected inverter system of claim 1, it is characterized in that described alone island detection system adds protection switch between RLC load in parallel and the electrical network between combining inverter and RLC load in parallel.
CN201010188151A 2010-05-28 2010-05-28 Three-phase photovoltaic grid connected inverter system Pending CN101847876A (en)

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Cited By (10)

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Publication number Priority date Publication date Assignee Title
CN101976855A (en) * 2010-11-28 2011-02-16 河海大学常州校区 Intelligent solar cell component and control method of array thereof
CN102565691A (en) * 2011-12-14 2012-07-11 广州三晶电气有限公司 Relay failure detection device and method for grid-connected inverter
CN102593862A (en) * 2012-02-02 2012-07-18 广西师范大学 Photovoltaic grid-connected inverter and control method thereof
CN102738825A (en) * 2012-06-11 2012-10-17 合肥工业大学 Novel photovoltaic grid-connected system based on modularized multi-level converter
CN103095162A (en) * 2013-02-07 2013-05-08 浙江昱能光伏科技集成有限公司 Power conversion system from direct current to alternating current
CN103235227A (en) * 2013-05-13 2013-08-07 周细文 Combined anti-island detection experiment load device
CN104062529A (en) * 2014-07-09 2014-09-24 华北电力大学 Island detection method
CN104135078A (en) * 2014-08-11 2014-11-05 国家电网公司 System and method for controlling distributed power source to be connected to power distribution network
CN104578875A (en) * 2014-11-19 2015-04-29 南京信息职业技术学院 Direct-current input circuit for photovoltaic inverter
CN104679560A (en) * 2015-02-15 2015-06-03 浙江理工大学 Inverter supporting control strategy on-line reassortment and on-line reassortment method

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CN201263091Y (en) * 2008-05-16 2009-06-24 广东志成冠军集团有限公司 Photovoltaic power generation system with grid-connected generation, independent power generation and UPS function
CN101599724A (en) * 2009-07-24 2009-12-09 中环(中国)工程有限公司 A kind of MPPT control device and method that is used for solar photovoltaic generation system
CN201430540Y (en) * 2009-07-03 2010-03-24 南开大学 Z-source inverter controlling system with FPGA based on DSP

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KR20080030129A (en) * 2006-09-29 2008-04-04 한양전공주식회사 Solar energy power generation system
CN101083399A (en) * 2007-05-30 2007-12-05 东南大学 Z source power transformation based photovoltaic network inverter
CN201263091Y (en) * 2008-05-16 2009-06-24 广东志成冠军集团有限公司 Photovoltaic power generation system with grid-connected generation, independent power generation and UPS function
CN201430540Y (en) * 2009-07-03 2010-03-24 南开大学 Z-source inverter controlling system with FPGA based on DSP
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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101976855A (en) * 2010-11-28 2011-02-16 河海大学常州校区 Intelligent solar cell component and control method of array thereof
CN102565691A (en) * 2011-12-14 2012-07-11 广州三晶电气有限公司 Relay failure detection device and method for grid-connected inverter
CN102593862A (en) * 2012-02-02 2012-07-18 广西师范大学 Photovoltaic grid-connected inverter and control method thereof
CN102593862B (en) * 2012-02-02 2014-11-05 广西师范大学 Photovoltaic grid-connected inverter and control method thereof
CN102738825A (en) * 2012-06-11 2012-10-17 合肥工业大学 Novel photovoltaic grid-connected system based on modularized multi-level converter
CN103095162A (en) * 2013-02-07 2013-05-08 浙江昱能光伏科技集成有限公司 Power conversion system from direct current to alternating current
CN103235227A (en) * 2013-05-13 2013-08-07 周细文 Combined anti-island detection experiment load device
CN104062529A (en) * 2014-07-09 2014-09-24 华北电力大学 Island detection method
CN104135078A (en) * 2014-08-11 2014-11-05 国家电网公司 System and method for controlling distributed power source to be connected to power distribution network
CN104578875A (en) * 2014-11-19 2015-04-29 南京信息职业技术学院 Direct-current input circuit for photovoltaic inverter
CN104679560A (en) * 2015-02-15 2015-06-03 浙江理工大学 Inverter supporting control strategy on-line reassortment and on-line reassortment method
CN104679560B (en) * 2015-02-15 2017-08-08 浙江理工大学 A kind of inverter for supporting control strategy to match somebody with somebody again online and online reallocating method

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