CN104426163B - The photovoltaic combining inverter Multimode Controlling Method of doubleization parallel-connection structure and system - Google Patents
The photovoltaic combining inverter Multimode Controlling Method of doubleization parallel-connection structure and system Download PDFInfo
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- CN104426163B CN104426163B CN201310394318.8A CN201310394318A CN104426163B CN 104426163 B CN104426163 B CN 104426163B CN 201310394318 A CN201310394318 A CN 201310394318A CN 104426163 B CN104426163 B CN 104426163B
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Abstract
The photovoltaic combining inverter Multimode Controlling Method of doubleization parallel-connection structure, the output of photovoltaic combining inverter is detected in real time, when inverter output power is less than the 2% of rated power, inverter enters holding state, and two groups of inversion unit modules all quit work；When inverter output power is more than the 2% of rated power and is less than 45%, inverter enters low power state, only opens one group of inversion unit module and works；When inverter output power is more than the 45% of rated power, inverter enters high power state, and two groups of inversion unit modules are in duty.The present invention is under standby mode, and two groups of inversion unit modules all quit work.Under small-power mode, only one group inversion unit module is operated.Under high-power mode, two groups of inversion unit modules work simultaneously, which reduce the day-to-day loss of inverter.It is low that the present invention has switching frequency, little from loss, the advantages such as output harmonic wave is little, it is possible to provides the more green energy for electrical network.
Description
Technical field
This intellectual achievement belongs to solar photovoltaic technology field, specifically, relates to the control method of a kind of low-power consumption doubleization solar photovoltaic interconnected inverter.
Background technology
Along with the progressively exhausted of conventional energy resource and all safety problems of thus causing, regenerative resource has obtained the extensive attention of multiple country of the world.In new regenerative resource, photovoltaic generation is with fastest developing speed, countries in the world all using the commercial development of solar energy power generating and utilize as important developing direction.
For the critical component photovoltaic DC-to-AC converter in pv grid-connected plant, it is necessary to there is the feature of high efficiency, low cost, low-power consumption.The efficiency of high-power photovoltaic synchronization inverter and loss problem are more increasingly by the extensive concern of countries in the world.High-power photovoltaic inverter has some to use doubleization structures, the traditional control method of this inverter to be to be all that two groups of inverter bridge work simultaneously in any operating mode.
The deficiency of this control strategy is: when low-power, delivery efficiency is low, and can reduce equipment life.
Summary of the invention
The present invention is to solve the problem that existing doubleization type photovoltaic DC-to-AC converter improves equipment life, it is provided that a kind of service life length the Multimode Controlling Method of photovoltaic combining inverter of doubleization parallel-connection structure.
For achieving the above object, the present invention is by the following technical solutions:
A kind of photovoltaic combining inverter Multimode Controlling Method of doubleization parallel-connection structure, the output of photovoltaic combining inverter is detected by real time, when inverter output power is less than the 2% of rated power, inverter enters holding state, and two groups of inversion unit modules all quit work；When inverter output power is more than the 2% of rated power and is less than 45%, inverter enters low power state, only opens one group of inversion unit module and works；When inverter output power is more than the 45% of rated power, inverter enters high power state, and two groups of inversion unit modules are in duty.
Two groups of inversion unit modules use the mode of rotation work to devote oneself to work state.
A kind of photovoltaic combining inverter Multimode Control System of doubleization parallel-connection structure, it includes:
Main control unit, samples to the temperature signal of exchange and the voltage signal of DC side, current signal and each module and calculates, and then generates SVPWM and drives signal；
Tracing control unit, drives signal to be sent to inversion unit module by SVPWM；
Two groups of inversion unit modules, often group inversion unit module is the three phase full bridge voltage source type inverter that rated output power is identical and is connected in parallel, the carrier phase difference of two groups of inversion unit modules 180 °.
Described main control unit is connected with host computer unit communications, and host computer unit and tele-control system carry out telecommunication, for showing the current operating state of inverter.
The outlet side of two groups of inversion unit modules all uses LCL filter farthest to decay the high-frequency harmonic injecting electrical network.
Using the present invention of technique scheme, photovoltaic combining inverter can be operated under standby, small-power, high-power three kinds of mode respectively according to the intensity of illumination.Under standby mode, two groups of inversion unit modules all quit work.Under small-power mode, only one group inversion unit module is operated.Under high-power mode, two groups of inversion unit modules work simultaneously, which reduce the day-to-day loss of inverter.The outlet side of photovoltaic combining inverter uses LCL filter, farthest decays the high-frequency harmonic injecting electrical network.It is low that the present invention has switching frequency compared to traditional high-power photovoltaic synchronization inverter, and system is little from loss, the advantages such as output harmonic wave is little, it is possible to provides the more green energy for electrical network.
Accompanying drawing explanation
Fig. 1 is the control flow chart of the present invention.
Fig. 2 is the system construction drawing of the present invention.
Detailed description of the invention
As it is shown in figure 1, the photovoltaic combining inverter Multimode Controlling Method of the doubleization parallel-connection structure in the present invention, it is exactly a kind of parallel networking type photovoltaic electricity generation system scheme in fact.Above-mentioned described parallel networking type photovoltaic electricity generation system includes: photovoltaic module, three-phase photovoltaic grid-connected inverting device and electrical network.Three-phase grid type photovoltaic generating system is the principal mode of large-sized photovoltaic electricity generation system, and structure is complicated, and power is big, and technology requires height, and efficiency is high.It typically uses three phase full bridge type inverter；Photovoltaic module is generally formed by solar cell is monomer series-connected.
First the output of photovoltaic combining inverter is detected by the present invention in real time, and the sensor of inverter can only detect line voltage and output electric current, and is all three-phase alternating current amount, and the output of inverter must be by being calculated indirectly.When inverter output power is less than the 2% of rated power, inverter enters holding state, and two groups of inversion unit modules all quit work；When inverter output power is more than the 2% of rated power and is less than 45%, inverter enters low power state, only opens one group of inversion unit module and works；When inverter output power is more than the 45% of rated power, inverter enters high power state, and two groups of inversion unit modules are in duty.It should be noted that the matching relationship between above-mentioned inverter output power and rated power, it is that the relation between output and the loss value according to inverter reality calculates, during calculating, should ensure that the loss value of inverter is minimum.
For preventing two groups of inverter output power unbalanced, use the mode of two groups of inversion unit module rotation work, i.e. when entering low-duty every time, two groups of inversion unit module alternate runs.If this time inverter enters low-duty, first group of inversion unit module work, then enter low-duty, then second group of inversion unit module work next time.
As in figure 2 it is shown, the photovoltaic combining inverter Multimode Control System of a kind of doubleization parallel-connection structure, it includes: two groups of inversion unit modules, master control control unit, tracing control unit, host computer unit, filtering part and transformer portion.
Main control unit, samples to the temperature signal of exchange and the voltage signal of DC side, current signal and each module and calculates, and then generates SVPWM and drives signal；When fault message being detected, immediately inverter is taked corresponding protective measure.
Tracing control unit, drives signal to be sent to inversion unit module by SVPWM；Carry out hardware protection by hardware circuit key signal each to system (such as DC voltage, DC side electric current, inversion unit module temperature) simultaneously, thus improve rapidity and the reliability of inverter protection.
Two groups of inversion unit modules, often group inversion unit module be rated output power identical and be connected in parallel three phase full bridge voltage source type inverter, the carrier phase difference of two groups of inversion unit modules 180 °, i.e. achieves the doubleization parallel-connection structure of two groups of inversion unit modules.
Described main control unit is connected with host computer unit communications, and host computer unit and tele-control system carry out telecommunication, for showing the current operating state of inverter, including various service datas, various historical datas etc..And to the setting of many kinds of parameters in control system.
The outlet side of two groups of inversion unit modules all uses LCL filter, namely inductor-capacitor-inductance filter, farthest decays the high-frequency harmonic injecting electrical network.
Claims (5)
1. the photovoltaic combining inverter Multimode Controlling Method of a doubleization parallel-connection structure, it is characterized in that, the output of photovoltaic combining inverter is detected by real time, when inverter output power is less than the 2% of rated power, inverter enters holding state, and two groups of inversion unit modules all quit work；When inverter output power is more than the 2% of rated power and is less than 45%, inverter enters low power state, only opens one group of inversion unit module and works；When inverter output power is more than the 45% of rated power, inverter enters high power state, and two groups of inversion unit modules are in duty.
The photovoltaic combining inverter Multimode Controlling Method of doubleization parallel-connection structure the most according to claim 1, it is characterised in that: two groups of inversion unit modules use the mode of rotation work to devote oneself to work state.
3. the photovoltaic combining inverter Multimode Control System of a doubleization parallel-connection structure, it is characterised in that it includes:
Main control unit, samples to the temperature signal of exchange and the voltage signal of DC side, current signal and each module and calculates, and then generates SVPWM and drives signal；Detecting the output of photovoltaic combining inverter in real time, when inverter output power is less than the 2% of rated power, inverter enters holding state, and two groups of inversion unit modules all quit work；When inverter output power is more than the 2% of rated power and is less than 45%, inverter enters low power state, only opens one group of inversion unit module and works；When inverter output power is more than the 45% of rated power, inverter enters high power state, and two groups of inversion unit modules are in duty；
Tracing control unit, drives signal to be sent to inversion unit module by SVPWM；
Two groups of inversion unit modules, often group inversion unit module is the three phase full bridge voltage source type inverter that rated output power is identical and is connected in parallel, the carrier phase difference of two groups of inversion unit modules 180 °.
The photovoltaic combining inverter Multimode Control System of doubleization parallel-connection structure the most according to claim 3, it is characterized in that: described main control unit is connected with host computer unit communications, host computer unit and tele-control system carry out telecommunication, for showing the current operating state of inverter.
The photovoltaic combining inverter Multimode Control System of doubleization parallel-connection structure the most according to claim 3, it is characterised in that: the outlet side of two groups of inversion unit modules all uses LCL filter farthest to decay the high-frequency harmonic injecting electrical network.
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| CN102148507A (en) * | 2010-02-08 | 2011-08-10 | 南京冠亚电源设备有限公司 | Photovoltaic grid-connected inverter MPPT (Maximum Power Point Tracking) system based on admittance optimization algorithm |
| CN102185513A (en) * | 2011-05-18 | 2011-09-14 | 华北电力大学（保定） | Parallel structure and control method for photovoltaic power generation grid-connected inverter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102148507A (en) * | 2010-02-08 | 2011-08-10 | 南京冠亚电源设备有限公司 | Photovoltaic grid-connected inverter MPPT (Maximum Power Point Tracking) system based on admittance optimization algorithm |
| CN102185513A (en) * | 2011-05-18 | 2011-09-14 | 华北电力大学（保定） | Parallel structure and control method for photovoltaic power generation grid-connected inverter |
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| 1MW可再生能源发电并网变流器的研制;姚为正等;《电力电子技术》;20090331;第43卷(第3期);第4-5、18页 * |
| 多模态控制系统研究;郝立军等;《河北科技大学学报》;20021231;第23卷(第1期);第16-21页 * |
| 多重化逆变器及其控制方法;梁中华等;《沈阳工业大学学报》;20090630;第31卷(第3期);第262-265，291页 * |
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