CN202737480U - Photovoltaic grid-connected inverter with high frequency link - Google Patents
Photovoltaic grid-connected inverter with high frequency link Download PDFInfo
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- CN202737480U CN202737480U CN2012203157877U CN201220315787U CN202737480U CN 202737480 U CN202737480 U CN 202737480U CN 2012203157877 U CN2012203157877 U CN 2012203157877U CN 201220315787 U CN201220315787 U CN 201220315787U CN 202737480 U CN202737480 U CN 202737480U
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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
- 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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Abstract
The utility model discloses a photovoltaic grid-connected inverter with a high frequency link. The photovoltaic grid-connected inverter comprises an inverter assembly and a control assembly, wherein the inverter assembly comprises a high-frequency inverter circuit, a high-frequency isolation transformer circuit, a high-frequency rectifier circuit, a direct-current filter circuit, a power-frequency inverter circuit and an output filter circuit, which are sequentially connected with one another; and the control assembly comprises a digital signal processor, a maximum power point tracking circuit, a control protection circuit, a driving circuit, a direct-current voltage current sampling circuit and a grid-connected current sampling circuit, which are sequentially connected with one another. A photovoltaic power generating assembly is connected with an input end of the inverter assembly, and a load and/or an alternating-current power grid are/is connected with an output end of the inverter assembly. The sampling ends and the control ends of the control assembly and inverter assembly are respectively connected with one another. The photovoltaic grid-connected inverter has the characteristics of safety, reliability and high work efficiency.
Description
Technical field
The utility model relates to a kind of inverter, is specifically related to a kind of photovoltaic combining inverter with high frequency link.
Background technology
The high speed development of modern economy has caused the crisis of the energy and environment, and this just requires us to change dependence to traditional energy, improves the development and use of regenerative resource.Intelligent grid is considered to change a kind of development model of electric power system looks; the plurality of advantages such as that distributed energy has is pollution-free, reserves are large; wherein solar power generation becomes the important breakthrough direction that solves the energy and environmental crisis, is one of development trend of following clean energy resource utilization.
Because inverter can convert direct current energy to the alternating current of constant voltage constant frequency, generate electricity by way of merging two or more grid systems for the AC load electricity consumption or with AC network.Therefore under the condition of the stabilized power supply that public electric wire net can't guarantee to provide high-quality; combining inverter can not only be according to the electrical network situation; dynamic adjustments is meritorious and idle; can also shield to circuit; and for battery charging, use and the performance of data are stored; follow the tracks of maximum power point control etc., to improve as far as possible electricity generation system efficient.Yet, because traditional inverter adopts the low frequency link inversion transformation technique more, namely mainly contain square-wave inverter, the synthetic inverter of staircase waveform, Sine Pulse Width Modulation inverter, therefore still have the following disadvantages: 1. Industrial Frequency Transformer volume and weight audio noise large, that produce is large; 2. for the fluctuation of line voltage and load, dynamic response is relatively poor; 3. outputting inductance ripple and harmonic wave are larger; 4. the switching frequency of the volume of Industrial Frequency Transformer and inverter is irrelevant, and is only relevant with the frequency of output voltage, causes conversion efficiency lower.So the adding high frequency link has overcome the shortcoming of low frequency link inversion transformation technique, has significantly improved the characteristic of inverter.
The utility model content
Technical problem to be solved in the utility model provides a kind of photovoltaic combining inverter with high frequency link, and it has safe and reliable and characteristics high efficiency.
For addressing the above problem, a kind of photovoltaic combining inverter with high frequency link that the utility model is designed, comprise inverter assembly, described inverter assembly mainly is comprised of high-frequency inverter circuit, high-frequency isolation transformer circuit, high-frequency rectification circuit, DC filtering circuit, power frequency inverter circuit and output filter circuit; The direct voltage source of the low pressure that photovoltaic electrification component produces becomes high-frequency alternating current through high-frequency inverter circuit, high-frequency alternating current becomes high-frequency alternating current by high-frequency isolation transformer circuit liter, high-frequency alternating current becomes direct current through high-frequency rectification circuit, this direct current is by behind the DC filtering circuit filtering, be reverse into low frequency ac through the power frequency inverter circuit again, low frequency ac obtains required industrial-frequency alternating current after by output filter circuit and is connected in load and/or the AC network.
In the such scheme, preferably also be connected to input filter circuit between described photovoltaic electrification component and the high-frequency inverter circuit.
Photovoltaic combining inverter described in the utility model also further comprises control assembly, and this control assembly mainly is comprised of digital signal processor, MPPT maximum power point tracking circuit (MPPT circuit), control protection electric circuit, drive circuit, dc voltage and current sample circuit and grid-connected current sample circuit; The output of photovoltaic electrification component is through MPPT maximum power point tracking circuit linking number word signal processor; the input of high-frequency inverter circuit is through dc voltage and current sample circuit linking number word signal processor; the output of power frequency inverter circuit is through grid-connected current sample circuit linking number word signal processor; digital signal processor connects the control end of high-frequency inverter circuit by control protection electric circuit, digital signal processor connects the control end of power frequency inverter circuit by drive circuit.
When output filter circuit linked to each other with AC network, described control assembly also comprised the line voltage sample circuit, and the line voltage sample circuit is connected on the AC network and with the sampling voltage of AC network and delivers to digital signal processor.
As the improvement of such scheme, also be connected to human-machine interface unit on the described digital signal processor.
As the further improvement of such scheme, also be connected to photoelectric coupling circuit between described digital signal processor and the human-machine interface unit.
Compared with prior art, the utlity model has following features:
1, utilizing high frequency transformer to substitute low-frequency transformer carries out Energy Transfer and realizes electrical isolation between the first and second side power supply of convertor assembly, thereby reduced the volume and weight of transformer, reduced audio noise, inverter also has the advantages such as conversion efficiency is high, output voltage ripple is little in addition;
2, by the effective control of control assembly realization to inverter, not only so that inverter output voltage is same frequently with the same frequently homophase (power factor is 1) of identical amplitude, output current and line voltage with line voltage, and so that the output of inverter can be satisfied the quality of power supply requirement of electrical network; To improve as far as possible the photovoltaic system generating efficiency;
3, human-machine interface unit both can be communicated by letter with the control system of combining inverter, also can be connected with host computer communication, and showed current device operation major parameter and running status, and manual operation function and terminal monitoring are provided.
Description of drawings
Fig. 1 is a kind of circuit structure diagram with photovoltaic combining inverter of high frequency link.
Fig. 2 is Fig. 1 actual installation schematic diagram.
Fig. 3 is the theory diagram of inverter assembly.
Fig. 4 is the instantaneous relatively control block diagram of hysteresis current.
Embodiment
Referring to Fig. 1 and Fig. 2, a kind of photovoltaic combining inverter with high frequency link of the present embodiment comprises inverter assembly and control assembly.
Inverter assembly mainly is comprised of high-frequency inverter circuit, high-frequency isolation transformer circuit, high-frequency rectification circuit, DC filtering circuit, power frequency inverter circuit and output filter circuit.The direct voltage source of the low pressure that photovoltaic electrification component produces becomes high-frequency alternating current through high-frequency inverter circuit, high-frequency alternating current becomes high-frequency alternating current by high-frequency isolation transformer circuit liter, high-frequency alternating current becomes direct current through high-frequency rectification circuit, this direct current is by behind the DC filtering circuit filtering, be reverse into low frequency ac through the power frequency inverter circuit again, low frequency ac obtains required industrial-frequency alternating current after by output filter circuit and is connected in load and/or the AC network.Above-mentioned photovoltaic combining inverter is in fact not isolate power frequency DC-AC converter by the DC-DC converter of prime isolation boosting type and rear class to be in series.Referring to Fig. 3.
The structural similarity of photovoltaic electrification component and existing photovoltaic electrification component, it is that photovoltaic array and storage battery consist of by solar battery array mainly, wherein the output of solar battery array is connected to the input of storage battery, and the input of storage battery links to each other with inverter assembly as the direct current supply output simultaneously.Carry out inversion in order more stable voltage source to be inputed to inverter, also be connected to input filter circuit between described photovoltaic electrification component and the high-frequency inverter circuit.
Since photovoltaic combining inverter realize being incorporated into the power networks need satisfy its output voltage and line voltage with frequently with identical amplitude, output current and line voltage are with frequency homophase (power factor is 1), and it exports the quality of power supply requirement that also need satisfy electrical network.Therefore the present embodiment also is provided with effective control that a control assembly is realized inverter.Above-mentioned control assembly mainly is comprised of digital signal processor, MPPT maximum power point tracking circuit, control protection electric circuit, drive circuit, dc voltage and current sample circuit and grid-connected current sample circuit; The output of photovoltaic electrification component is through MPPT maximum power point tracking circuit linking number word signal processor; the input of high-frequency inverter circuit is through dc voltage and current sample circuit linking number word signal processor; the output of power frequency inverter circuit is through grid-connected current sample circuit linking number word signal processor; digital signal processor connects the control end of high-frequency inverter circuit by control protection electric circuit, digital signal processor connects the control end of power frequency inverter circuit by drive circuit.In order to follow the tracks of power network current, when output filter circuit links to each other with AC network, described control assembly also comprises the line voltage sample circuit, and the line voltage sample circuit is connected on the AC network and with the sampling voltage of AC network delivers to digital signal processor.
Digital signal processor is the core component of whole control assembly, and it is responsible for input signal is carried out the AD conversion, and the data that convert are carried out aftertreatment, realizes real-time grid-connected current via algorithm, and phase-locked loop control and isolated island detect.In the present embodiment, adopting model is that the dsp chip of TMS320F2812 is realized.The present embodiment is realized the control of being incorporated into the power networks of inverter in conjunction with MATLAB simulated environment and DSP, utilize the MATLAB simulation software to generate and can carry out the DSP code, and programming process is simplified, and more easily realizes.
The control of the photovoltaic combining inverter that control assembly is realized is divided into 2 links: the 1st link obtains system power point, i.e. photovoltaic array working point; The 2nd link finished photovoltaic inverting system to the tracking of electrical network simultaneously, for guarantee safely and effectively on-line operation of photovoltaic DC-to-AC converter in and net state, realize the Detection ﹠ Controling function of defencive function and isolated island effect prevention.Wherein, be the core of whole Inversion Control System to the tracking control procedure of electrical network, be directly connected to the output quality of power supply and the operational efficiency of system.Because photovoltaic combining inverter is based on the PWM inversion and realizes, so its control belongs to inverter PWM current control mode.In the present embodiment; adopt instantaneous manner of comparison as shown in Figure 4, the compensation of current error and the generation of pwm signal are finished at same control unit simultaneously, and have consisted of closed loop feedback; so that controller realizes simply having good dynamic response and inherent current protecting function.In addition, this control assembly the tracking control of finishing electrical network excessively in, also realize the voltage and current double closed-loop Instantaneous Control, SPWM control, phase-locked loop control, anti-island effect control etc.
In order to allow photovoltaic combining inverter and the host computer of outside communicate, simultaneously also in order to show current device operation major parameter and running status and manual operation function and terminal monitoring to be provided; Also be connected to human-machine interface unit on the described digital signal processor.In addition, in order to strengthen antijamming capability, also be connected to photoelectric coupling circuit between described digital signal processor and the human-machine interface unit.Above-mentioned human-machine interface unit includes single-chip microcomputer, communication bus interface, liquid crystal display and button etc., wherein communication bus interface, liquid crystal display and button all are connected on the single-chip microcomputer, and single-chip microcomputer then links to each other with digital signal processor through photoelectric coupling circuit.In the present embodiment, described communication bus is the RS-485 bus.
Claims (6)
1. photovoltaic combining inverter with high frequency link, comprise inverter assembly, it is characterized in that: described inverter assembly mainly is comprised of high-frequency inverter circuit, high-frequency isolation transformer circuit, high-frequency rectification circuit, DC filtering circuit, power frequency inverter circuit and output filter circuit; The direct voltage source of the low pressure that photovoltaic electrification component produces becomes high-frequency alternating current through high-frequency inverter circuit, high-frequency alternating current becomes high-frequency alternating current by high-frequency isolation transformer circuit liter, high-frequency alternating current becomes direct current through high-frequency rectification circuit, this direct current is by behind the DC filtering circuit filtering, be reverse into low frequency ac through the power frequency inverter circuit again, low frequency ac obtains required industrial-frequency alternating current after by output filter circuit and is connected in load and/or the AC network.
2. a kind of photovoltaic combining inverter with high frequency link according to claim 1 is characterized in that: also be connected to input filter circuit between described photovoltaic electrification component and the high-frequency inverter circuit.
3. a kind of photovoltaic combining inverter with high frequency link according to claim 1 and 2, it is characterized in that: also further comprise control assembly, this control assembly mainly is comprised of digital signal processor, MPPT maximum power point tracking circuit, control protection electric circuit, drive circuit, dc voltage and current sample circuit and grid-connected current sample circuit; The output of photovoltaic electrification component is through MPPT maximum power point tracking circuit linking number word signal processor; the input of high-frequency inverter circuit is through dc voltage and current sample circuit linking number word signal processor; the output of power frequency inverter circuit is through grid-connected current sample circuit linking number word signal processor; digital signal processor connects the control end of high-frequency inverter circuit by control protection electric circuit, digital signal processor connects the control end of power frequency inverter circuit by drive circuit.
4. a kind of photovoltaic combining inverter with high frequency link according to claim 3, it is characterized in that: when output filter circuit links to each other with AC network, described control assembly also comprises the line voltage sample circuit, and the line voltage sample circuit is connected on the AC network and with the sampling voltage of AC network delivers to digital signal processor.
5. a kind of photovoltaic combining inverter with high frequency link according to claim 3 is characterized in that: also be connected to human-machine interface unit on the described digital signal processor.
6. a kind of photovoltaic combining inverter with high frequency link according to claim 5 is characterized in that: also be connected to photoelectric coupling circuit between described digital signal processor and the human-machine interface unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2012203157877U CN202737480U (en) | 2012-07-02 | 2012-07-02 | Photovoltaic grid-connected inverter with high frequency link |
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| CN2012203157877U CN202737480U (en) | 2012-07-02 | 2012-07-02 | Photovoltaic grid-connected inverter with high frequency link |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103560511A (en) * | 2013-11-15 | 2014-02-05 | 北京国电通网络技术有限公司 | Off-grid / grid-connected integrated solar power generation subsystem and system |
| CN104269877A (en) * | 2014-07-01 | 2015-01-07 | 国家电网公司 | Hybrid modulation system and method of interlaced flyback photovoltaic grid-connected mini-type inverter |
| CN104319805A (en) * | 2014-09-15 | 2015-01-28 | 浙江理工大学 | Control method for photovoltaic grid-connected inverter system |
-
2012
- 2012-07-02 CN CN2012203157877U patent/CN202737480U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103560511A (en) * | 2013-11-15 | 2014-02-05 | 北京国电通网络技术有限公司 | Off-grid / grid-connected integrated solar power generation subsystem and system |
| CN104269877A (en) * | 2014-07-01 | 2015-01-07 | 国家电网公司 | Hybrid modulation system and method of interlaced flyback photovoltaic grid-connected mini-type inverter |
| CN104319805A (en) * | 2014-09-15 | 2015-01-28 | 浙江理工大学 | Control method for photovoltaic grid-connected inverter system |
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Granted publication date: 20130213 Termination date: 20130702 |