CN102856928B - A kind of inverter - Google Patents
A kind of inverter Download PDFInfo
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- CN102856928B CN102856928B CN201210365695.4A CN201210365695A CN102856928B CN 102856928 B CN102856928 B CN 102856928B CN 201210365695 A CN201210365695 A CN 201210365695A CN 102856928 B CN102856928 B CN 102856928B
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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 present invention relates to a kind of inverter, comprise Circuits System and control system, described Circuits System comprises solar panel and electrical network exports, and is provided with DC switch, BOOST booster circuit, single-phase full bridge circuit and grid-connected filter successively between described solar panel and electrical network export; Described control system comprises DSP parametric controller, and described DSP parametric controller is connected with protection module, sampling conditioning module, Zero-cross comparator module and level switch module, and described level switch module is connected with I/O information module, driver module and power amplifier module.Beneficial effect of the present invention is: the present invention is based on DSP parametric controller, have employed the mode such as topology and modulation, and have the advantages such as efficiency is high, lightweight, volume is little in actual use, peak efficiency reaches 97.51%; Can follow the tracks of grid-connected voltage-phase by track with zero error, realize unity power factor grid-connected, grid-connected current has outstanding harmonic characterisitic, and fully loaded THD is 1.57% simultaneously.
Description
Technical field
The present invention relates to electronic technology field, particularly relate to a kind of inverter.
Background technology
Along with the development of photovoltaic technology, and network electric energy quality and these two most important two indices of photovoltaic combining inverter of efficiency also become current technical difficult point and emphasis.Now inverter commercially is mainly divided into isolated form and non-isolation type two kinds of photovoltaic DC-to-AC converters, include transformer in isolated form inverter and make between cell panel and electrical network, there is no direct electrical communication, ensure that the safety of user, but transformer brings the loss of efficiency, general isolated form inverter efficiency lower than non-isolated inverter 1.5% or more, thus the inverter of non-isolated be after the main flow in market.
The photovoltaic DC-to-AC converter of non-isolated will solve the problem of common mode leakage current over the ground, has two kinds of approach, and one uses bipolar modulation mode on full-bridge basis, and one uses unipolarity modulation system but needs to increase other devices in addition to limit common mode leakage current.The former so apply less, generally adopts latter techniques owing to can reduce also network electric energy quality.Now solution is commercially: 1, add by-pass switch in the direct current point of incoming cables of full bridge inverter, as two kinds, H5, H6 circuit; 2, continuous current circuit is added, as HERIC circuit in the interchange outlet of full bridge inverter; 3, modified model NPC topological structure is adopted.
Although these technology can solve the problem of common mode leakage current over the ground, but method 1,2 all needs to increase new power switch pipe on the basis of full-bridge, increase the difficulty of main circuit design and control, under all working in high frequency state with stylish switching tube, adds somewhat to loss, lost and adopted unipolarity to modulate the odds for effectiveness brought.The twice of method 3 shortcoming to be direct voltage input requirements be H bridge, linear modulationra is low, needs the magnitude of voltage improving bus, increases the requirement of withstand voltage of dc-link capacitance and prime booster circuit.
Summary of the invention
The object of the present invention is to provide a kind of inverter, improve conversion efficiency to reach, improve the grid-connected quality of power supply, ensure lightweight, the feature such as volume is little of inverter simultaneously.
Object of the present invention is achieved through the following technical solutions:
A kind of inverter, comprise Circuits System and control system, described Circuits System comprises solar panel and electrical network exports, and is provided with DC switch, BOOST booster circuit, single-phase full bridge circuit and grid-connected filter successively between described solar panel and electrical network export; Described control system comprises DSP(Digital Signal Processing) parametric controller; described DSP parametric controller is connected with protection module, sampling conditioning module, Zero-cross comparator module and level switch module, and described level switch module is connected with I/O information module, driver module and power amplifier module.
Further, lightning protection device and electromagnetic interface filter is provided with successively between described solar panel and DC switch; Electromagnetic interface filter and lightning protection device is provided with successively between described grid-connected filter and electrical network export.
Further, described DSP parametric controller is connected with communicating circuit, and described communicating circuit is connected with host computer with liquid crystal indicator.Be provided with AD sampling module, EPWM(enhancement mode pulse width modulator in described DSP parametric controller) module, GPIO control module, serial communication modular, clock PLL(phase-locked loop) module and TZ drive lockout module.
Further, described DSP parametric controller is connected with auxiliary power circuit.
Beneficial effect of the present invention is: the present invention is based on DSP parametric controller, have employed the mode such as topology and modulation, and have the advantages such as efficiency is high, lightweight, volume is little in actual use, peak efficiency reaches 97.51%; Can follow the tracks of grid-connected voltage-phase by track with zero error, realize unity power factor grid-connected, grid-connected current has outstanding harmonic characterisitic, and fully loaded THD is 1.57% simultaneously.
Accompanying drawing explanation
Fig. 1 is the circuit structure diagram of a kind of inverter in the embodiment of the present invention;
Fig. 2 is the system construction drawing of a kind of inverter in the embodiment of the present invention;
Fig. 3 is the global topological circuit structural representation of a kind of inverter in the embodiment of the present invention;
Fig. 4 is the simple and easy unipolarity modulation principle figure of a kind of inverter in the embodiment of the present invention.
Embodiment
A kind of inverter described in the embodiment of the present invention, comprise Circuits System and control system, described Circuits System comprises solar panel and electrical network exports, and is provided with DC switch, BOOST booster circuit, single-phase full bridge circuit and grid-connected filter successively between described solar panel and electrical network export; Described control system comprises DSP parametric controller, and described DSP parametric controller is connected with protection module, sampling conditioning module, Zero-cross comparator module and level switch module, and described level switch module is connected with I/O information module, driver module and power amplifier module.
Further, lightning protection device and electromagnetic interface filter is provided with successively between described solar panel and DC switch; Electromagnetic interface filter and lightning protection device is provided with successively between described grid-connected filter and electrical network export.
Further, described DSP parametric controller is connected with communicating circuit, and described communicating circuit is connected with host computer with liquid crystal indicator.Be provided with AD sampling module, EPWM module, GPIO control module, serial communication modular, clock PLL module and TZ in described DSP parametric controller and drive lockout module; Described DSP parametric controller is provided with auxiliary power circuit.
During concrete enforcement, the structure of whole inverter as depicted in figs. 1 and 2.The voltage of solar panel is first through DC switch, and laggard lightning protection component and electromagnetic interface filter, this structure avoids extraneous fortuitous event to occur to bring danger to the normal operation of system, improves the safety and reliability of product.Major loop adopts two-stage type topological structure, to expand the scope of cell panel input voltage.Prime booster circuit adopts traditional Boost circuit, cell panel input voltage is increased to the high voltage meeting inverter requirement, complete the tracking to cell panel maximum power point, direct voltage inversion is that alternating voltage realizes unity power factor and generates electricity by way of merging two or more grid systems by rear class single-phase full bridge circuit simultaneously.Resisting the ability of external interference in order to improve the grid-connected quality of power supply and raising system, before alternating current feeds electrical network, also will carry out two stage filter and lightning protection process.Do not comprise isolation transformer component in whole inverter, make system can obtain higher efficiency performance.
The power supply of system adopts flyback power supply structure.The signal of transducer collection delivers to AD mouth and the I/O mouth of DSP parametric controller after modulate circuit; DSP parametric controller carries out analog-to-digital conversion to the sampling of analog quantity; carry out protection according to the result of conversion to judge; carry out closed loop calculating, the MPPT maximum power point tracking calculating of two-stage circuit simultaneously according to result, send PWM drive singal to module.Native system has the functions such as man-machine interface serial communication, and the touch-screen control inerface of hommization is user-friendly.
Consider from the angle of Energy harvesting, if interrupted situation appears in the electric current of inductance in BOOST circuit, then the energy of inevitable cell panel is for some time utilized, so circuit design should avoid the situation occurring discontinuous current as far as possible, inductance value is chosen can not be too little.If ignore the dead resistance of inductance and electric capacity, when PWM ripple duty ratio is excessive, continuation increase duty ratio output voltage can not raise and can reduce on the contrary, and this is because the parasitic parameter of circuit causes.In side circuit application, the maximum pulse width of PWM ripple should be limited.Limiting maximum pulse width in native system is 0.75.
Combining inverter all adopts direct Current Control Technology, makes grid-connected current be in feedback closed loop state, can obtain more preferably stable state accuracy and dynamic responding speed, and can reduce the susceptibility of electric current to Parameters variation, strengthens the interference rejection ability of system.Typical control method comprises Current Control, hysteretic loop current control, the control of ratio resonance, internal model control, predictive-current control theory etc. based on PI controller.
As shown in Figure 3, the topological structure of inverter adopts traditional full bridge structure, and modulator approach adopts simple and easy unipolarity modulator approach.The switching tube state of traditional monopole modulation system, at the positive half period of modulating wave, switching tube S1 conducting all the time, S3, S4 replace break-make, and in fact S3 only under non-resistive load, just need in the region of PWM ripple fundametal compoment and anti-phase to open afterflow, all the other time completes afterflow by anti-paralleled diode D3.Current relevant criterion requires that the grid-connected power factor of little power single phase combining inverter is 1 as far as possible, namely the load of combining inverter can be considered filter inductance and purely resistive load in series, and relative resistive load, the impact of filter inductance is very little, so in photovoltaic combining inverter application, further unipolarity modulation system can be reduced to simple and easy unipolarity pattern, namely at the positive half period of modulating wave, switching tube S1 conducting all the time, S2, S3 turns off all the time, S4 is with PWM ripple mode break-make, at the negative half-cycle of modulating wave, switching tube S3 conducting all the time, S1, S4 turns off all the time, S2 is with PWM ripple mode break-make, as shown in Figure 4.
Like this, compared with traditional monopole modulation system, although in fact the switch motion reduced can't bring the lifting in efficiency, but in actual applications, the former must need to add dead band because two switching tubes of a brachium pontis replace break-make, adverse effect is brought to grid-connected current, and can not need to add PWM ripple dead band under the modulation of simple and easy unipolarity, make brachium pontis mid point output voltage reduce the harmonic wave brought because of dead band under normal circumstances.
Traditional implementation method is that S1 ~ S4 adopts IGBT, and four IGBT need action once in each switch periods, the loss of such power is larger, what native system adopted is that S1, S3 adopt IGBT, and S2 and S4 adopts coolMOS to replace IGBT, and S1 and S3 maintains each switch periods action once, S2 and S4 only needs each sinusoidal cycles action once, greatly reduce the loss of power device like this, thus improve the conversion efficiency of whole system.
The typical control structure that native system inverter side adopts busbar voltage outer shroud, grid-connected current inner ring to control, wherein outer voltage adopts pi regulator, current inner loop is theoretical based on dead beat Current Control, and whole controller only has a pi regulator, and parameter tuning is fairly simple.Outer shroud voltage control makes electrochemical capacitor DC bus-bar voltage be constant or realizes MPPT control; Inner ring Current Control ensures to export the quality of power supply.
The control core of inverter is the minimum system plate of the floating point number signal processor TMS320F28335 based on TI company, and the advantages such as its high accuracy, low-power consumption, high integration peripheral hardware are that the control performance improving whole system provides guarantee.Native system adopts 12 high-precision AD, effectively improves the sampling precision of system.For protection, data processing provide reliable basis in time.Have intelligent communication control system, can control by unit touch-screen, also can be controlled by remote detection.
Although above only describes the specific embodiment of the present invention example, it will be understood by those of skill in the art that these only illustrate, protection scope of the present invention is defined by the appended claims.Those skilled in the art, under the prerequisite not deviating from principle of the present invention and essence, can make various changes or modifications to these execution modes, but these change or amendment all falls into protection scope of the present invention.
Claims (4)
1. an inverter, comprise Circuits System and control system, it is characterized in that: described Circuits System comprises solar panel and electrical network exports, between described solar panel and electrical network export, be provided with DC switch, BOOST booster circuit, single-phase full bridge circuit and grid-connected filter successively; Described control system comprises DSP parametric controller, and described DSP parametric controller is connected with protection module, sampling conditioning module, Zero-cross comparator module and level switch module, and described level switch module is connected with I/O information module, driver module and power amplifier module; Lightning protection device and electromagnetic interface filter is provided with successively between described solar panel and DC switch; Electromagnetic interface filter and lightning protection device is provided with successively between described grid-connected filter and electrical network export; And limiting maximum pulse width in described Circuits System is 0.75.
2. a kind of inverter according to claim 1, is characterized in that: described DSP parametric controller is connected with communicating circuit, and described communicating circuit is connected with host computer with liquid crystal indicator.
3. a kind of inverter according to claim 2, is characterized in that: be provided with AD sampling module, EPWM module, GPIO control module, serial communication modular, clock PLL module and TZ in described DSP parametric controller and drive lockout module.
4. a kind of inverter according to claim 3, is characterized in that: described DSP parametric controller is connected with auxiliary power circuit.
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| CN201210365695.4A CN102856928B (en) | 2012-09-27 | 2012-09-27 | A kind of inverter |
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| CN102856928B true CN102856928B (en) | 2015-12-02 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103117672B (en) * | 2013-02-07 | 2015-08-26 | 江苏方程电力科技有限公司 | A kind of inverter control circuit be applied in electric power system |
| CN103647459A (en) * | 2013-11-22 | 2014-03-19 | 肖红军 | High-frequency-link parallel inverter with no connection wire |
| CN103730909B (en) * | 2013-12-18 | 2016-12-07 | 国网山东省电力公司菏泽供电公司 | Communication base station solar DC generates electricity by way of merging two or more grid systems DC-DC specialized control equipment and method |
| CN107248814B (en) * | 2016-03-29 | 2019-09-13 | 比亚迪股份有限公司 | Single-phase alternating expression pfc circuit and onboard charger and electric car with it |
| CN106961123B (en) * | 2017-05-24 | 2019-12-31 | 浙江昱能科技有限公司 | Control device of grid-connected inverter |
| CN111682770A (en) * | 2020-06-18 | 2020-09-18 | 中南大学 | Primary side current sampling double closed-loop digital control method of active clamping forward converter |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2888741Y (en) * | 2005-09-19 | 2007-04-11 | 珠海泰坦科技股份有限公司 | Power supply control system for non-master parallel operation of inverter |
| CN102157959A (en) * | 2011-03-30 | 2011-08-17 | 华南理工大学 | Solar photovoltaic contravariant generating system and operation method thereof |
| CN202872387U (en) * | 2012-09-27 | 2013-04-10 | 北京京仪绿能电力***工程有限公司 | Inverter |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2888741Y (en) * | 2005-09-19 | 2007-04-11 | 珠海泰坦科技股份有限公司 | Power supply control system for non-master parallel operation of inverter |
| CN102157959A (en) * | 2011-03-30 | 2011-08-17 | 华南理工大学 | Solar photovoltaic contravariant generating system and operation method thereof |
| CN202872387U (en) * | 2012-09-27 | 2013-04-10 | 北京京仪绿能电力***工程有限公司 | Inverter |
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