CN103138287A - Three phase inverter used for solar photovoltaic grid-connected system - Google Patents
Three phase inverter used for solar photovoltaic grid-connected system Download PDFInfo
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- CN103138287A CN103138287A CN2011103984333A CN201110398433A CN103138287A CN 103138287 A CN103138287 A CN 103138287A CN 2011103984333 A CN2011103984333 A CN 2011103984333A CN 201110398433 A CN201110398433 A CN 201110398433A CN 103138287 A CN103138287 A CN 103138287A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The invention relates to a three phase inverter used for a solar photovoltaic grid-connected system. The three phase inverter used for the solar photovoltaic grid-connected system comprises an inverting circuit, a control circular, a filter circuit and a detection circuit. The control circuit comprises a digital signal processor (DSP), a protective module and a digital lock-phase module used for locking voltage phase of an electrical grid. The digital lock-phase module comprises a digital phase discriminator, a digital filter and a digital-controlled oscillator which are sequentially connected. The digital phase discriminator detects phase difference of input signal and output signal by comparing the input signal and the output signal. The digital filter conducts filtering on the input signal. The digital oscillator is used for regulating phase difference of digital signals. Compared with the prior art, the three phase inverter used for the solar photovoltaic grid-connected system can conduct digital phase locking on voltage of the electric grid, can effectively prevent phenomenon of jittering or losing lock of the voltage phase from occurring, and ensures normal operation of the solar photovoltaic grid-connected system.
Description
Technical field
The present invention relates to the solar photovoltaic grid-connection system, especially relate to a kind of three-phase inverter for the solar photovoltaic grid-connection system.
Background technology
Along with increase, the expanding economy of population, the mankind are also increasing for the demand of the energy, and traditional energy reserve is day by day exhausted, thereby has brought the energy starved problem.And a large amount of uses of fossil fuel become increasingly conspicuous to the harm that environment for human survival causes, and even cause ecological degeneration, and these have become the significant problem that world faces.So developing regenerative resource and various green energy resource is the necessary Adopts measures of the mankind, and considers from the factors of energy supply, solar energy meets the desirable green energy resource of the strategy of sustainable development beyond doubt most.The identification of global energy brainstrust, solar energy will become one of most important energy of 21 century.
In the inverter circuit of photovoltaic parallel in system, be a key technology to the phase-locked of line voltage.Because electric power system can produce larger electromagnetic interference when working, therefore, its simple phase-lock technique is easy to be interfered and losing lock, thereby causes system normally to move.
Summary of the invention
Purpose of the present invention is exactly to provide a kind of three-phase inverter for the solar photovoltaic grid-connection system for the defective that overcomes above-mentioned prior art existence, the control module of this three-phase inverter is provided with the digital phase-locking phase module, can carry out numeral to line voltage phase-locked, can effectively prevent the phenomenon of voltage-phase shake or losing lock, guarantee the normal operation of solar photovoltaic grid-connection system.
Purpose of the present invention can be achieved through the following technical solutions:
a kind of three-phase inverter for the solar photovoltaic grid-connection system, this three-phase inverter is located between device of solar generating and electrical network, comprise inverter circuit, control circuit, filter circuit and testing circuit, the input of described inverter circuit connects device of solar generating, output connects the input of filter circuit, the output of described filter circuit connects electrical network, described testing circuit connects electrical network, the voltage and current of detection of grid, described control circuit is connected with testing circuit with inverter circuit respectively, control circuit comprises DSP, protection module and be used for the digital phase-locking phase module of the voltage-phase of locking electrical network, this digital phase-locking phase module comprises the digital phase discriminator that connects successively, digital filter and digital controlled oscillator, described digital phase discriminator is by comparator input signal and output signal, detect the phase difference of input signal and output signal, described digital filter carries out filtering to the signal of input, described digital controlled oscillator is used for adjusting the phase difference of digital signal.
Described digital phase-locking phase module adopts CPLD to realize.
Described protection module comprises pulse width detection unit, common conduct detecting unit, voltage detection unit, current detecting unit and temperature detecting unit.
Described pulse width detection unit comprises three counters, detects respectively the effective width of three road pwm signals of DSP output, during higher than threshold value, sends abnormal interrupt signal and abnormality code information to DSP, interrupt circuit work when effective width.
Described common conduct detecting unit for detection of and control the symmetrical SPWM signal of two-way of inverter circuit, prevent the symmetrical SPWM signal of this two-way common conduct.
Described voltage detection unit detects the voltage signal of inverter circuit, when voltage is excessive, sends the overvoltage signal to DSP, interrupt circuit work.
Described current detecting unit detects the current signal of inverter circuit, when electric current is excessive, sends over-current signal to DSP, interrupt circuit work.
Described temperature detecting unit detects the temperature of inverter circuit, when temperature anomaly, sends the excess temperature abnormal signal to DSP, interrupt circuit work.
Compared with prior art; the present invention adopts CPLD to realize the function of digital phase-locking phase module; can carry out numeral to line voltage phase-locked; can effectively prevent the phenomenon of voltage-phase shake or losing lock; guarantee the normal operation of solar photovoltaic grid-connection system; and pass through other protection module when system exception, halt circuit work, thereby protection system.
Description of drawings
Fig. 1 is structural representation of the present invention;
Fig. 2 is the structural representation of digital phase-locking phase module of the present invention.
Embodiment
The present invention is described in detail below in conjunction with the drawings and specific embodiments.
Embodiment
As shown in Figure 1, a kind of three-phase inverter for the solar photovoltaic grid-connection system, this three-phase inverter is located between device of solar generating 1 and electrical network 6, comprises inverter circuit 2, control circuit 4, filter circuit 3 and testing circuit 5.The input of inverter circuit 2 connects device of solar generating 1, and output connects the input of filter circuit 3, and the output of filter circuit 3 connects electrical network 6, and testing circuit 5 connects electrical network 6, the voltage and current of detection of grid 6.Control circuit 4 is connected with inverter circuit 2, testing circuit 5 respectively, and control circuit 4 comprises DSP, protection module and digital phase-locking phase module.
The digital phase-locking phase module adopts CPLD to realize, is Xilinx CPLD XC95144 in the present embodiment, and its structural representation as shown in Figure 2.This digital phase-locking phase module comprises digital phase discriminator 41, digital filter 42 and the digital controlled oscillator 43 that connects successively, digital phase discriminator 41 is by comparator input signal and output signal, detect the phase difference of input signal and output signal, the signal of 42 pairs of inputs of digital filter carries out filtering, digital controlled oscillator 43 is used for adjusting the phase difference of digital signal, the phase difference of locking input signal and output signal.
Protection module in control circuit 4 comprises pulse width detection unit, common conduct detecting unit, voltage detection unit, current detecting unit and temperature detecting unit.
The pulse width detection unit comprises three counters, detects respectively three road pwm signals of DSP output, and when pwm signal was effective, counter began counting, and the higher limit of counter is 400, i.e. 200 μ s.The DSP that uses in the present embodiment is TMS320F2812, and the control cycle of setting is 55 μ s, during less than 200 μ s, thinks namely that this pwm signal is normal when the effective width of pwm signal, pwm signal is directly exported; If greater than 200 μ s, think that pwm signal occurs abnormal, the pulse width detection unit sends abnormal interrupt signal and abnormality code information, the work of interrupt circuit to DSP.
The common conduct detecting unit for detection of and control the symmetrical SPWM signal of two-way in inverter circuit 2, prevent the symmetrical SPWM signal of this two-way common conduct.
Voltage detection unit detects the voltage signal of inverter circuit 2, when voltage is excessive, sends the overvoltage signal to DSP, interrupt circuit work.
Current detecting unit detects the current signal of inverter circuit 2, when electric current is excessive, sends over-current signal to DSP, interrupt circuit work.
Temperature detecting unit detects the temperature of inverter circuit 2, when temperature anomaly, sends the excess temperature abnormal signal to DSP, interrupt circuit work.
Claims (8)
1. three-phase inverter that is used for the solar photovoltaic grid-connection system, this three-phase inverter is located between device of solar generating and electrical network, comprise inverter circuit, control circuit, filter circuit, testing circuit, the input of described inverter circuit connects device of solar generating, output connects the input of filter circuit, the output of described filter circuit connects electrical network, described testing circuit connects electrical network, the voltage and current of detection of grid, described control circuit is connected with testing circuit with inverter circuit respectively, control circuit comprises DSP and protection module, it is characterized in that, described control circuit also comprises the digital phase-locking phase module for the voltage-phase of locking electrical network, this digital phase-locking phase module comprises the digital phase discriminator that connects successively, digital filter and digital controlled oscillator, described digital phase discriminator is by comparator input signal and output signal, detect the phase difference of input signal and output signal, described digital filter carries out filtering to the signal of input, described digital controlled oscillator is used for adjusting the phase difference of digital signal.
2. a kind of three-phase inverter for the solar photovoltaic grid-connection system according to claim 1, is characterized in that, described digital phase-locking phase module adopts CPLD to realize.
3. a kind of three-phase inverter for the solar photovoltaic grid-connection system according to claim 1; it is characterized in that, described protection module comprises pulse width detection unit, common conduct detecting unit, voltage detection unit, current detecting unit and temperature detecting unit.
4. a kind of three-phase inverter for the solar photovoltaic grid-connection system according to claim 3, it is characterized in that, described pulse width detection unit comprises three counters, detect respectively the effective width of three road pwm signals of DSP output, when effective width during higher than threshold value, send abnormal interrupt signal and abnormality code information to DSP, interrupt circuit work.
5. a kind of three-phase inverter for the solar photovoltaic grid-connection system according to claim 3, it is characterized in that, described common conduct detecting unit for detection of and control the symmetrical SPWM signal of two-way of inverter circuit, prevent the symmetrical SPWM signal of this two-way common conduct.
6. a kind of three-phase inverter for the solar photovoltaic grid-connection system according to claim 3, is characterized in that, described voltage detection unit detects the voltage signal of inverter circuit, when voltage is excessive, sends the overvoltage signal to DSP, interrupt circuit work.
7. a kind of three-phase inverter for the solar photovoltaic grid-connection system according to claim 3, is characterized in that, described current detecting unit detects the current signal of inverter circuit, when electric current is excessive, sends over-current signal to DSP, interrupt circuit work.
8. a kind of three-phase inverter for the solar photovoltaic grid-connection system according to claim 3, is characterized in that, described temperature detecting unit detects the temperature of inverter circuit, when temperature anomaly, sends the excess temperature abnormal signal to DSP, interrupt circuit work.
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| CN2011103984333A CN103138287A (en) | 2011-12-05 | 2011-12-05 | Three phase inverter used for solar photovoltaic grid-connected system |
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Citations (4)
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|---|---|---|---|---|
| CN101714763A (en) * | 2009-09-03 | 2010-05-26 | 周德佳 | High-efficiency stable multifunctional single-stage photovoltaic single-phase grid-connected control method |
| US20110088748A1 (en) * | 2008-05-30 | 2011-04-21 | Kunsan National University Industry-Academy Cooper | Grid-interactive photovoltaic generation system with power quality control and energy saving |
| CN201846091U (en) * | 2010-08-13 | 2011-05-25 | 烟台东方电子玉麟电气有限公司 | Full numerical control three-phrase solar photovoltaic grid-connected inverter |
| CN201947196U (en) * | 2011-04-12 | 2011-08-24 | 中国科学院广州电子技术研究所 | Photovoltaic grid-connected inverter based on maximum power point tracking |
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- 2011-12-05 CN CN2011103984333A patent/CN103138287A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110088748A1 (en) * | 2008-05-30 | 2011-04-21 | Kunsan National University Industry-Academy Cooper | Grid-interactive photovoltaic generation system with power quality control and energy saving |
| CN101714763A (en) * | 2009-09-03 | 2010-05-26 | 周德佳 | High-efficiency stable multifunctional single-stage photovoltaic single-phase grid-connected control method |
| CN201846091U (en) * | 2010-08-13 | 2011-05-25 | 烟台东方电子玉麟电气有限公司 | Full numerical control three-phrase solar photovoltaic grid-connected inverter |
| CN201947196U (en) * | 2011-04-12 | 2011-08-24 | 中国科学院广州电子技术研究所 | Photovoltaic grid-connected inverter based on maximum power point tracking |
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Application publication date: 20130605 |