CN104410312A - Paralleled current sharing control method of photovoltaic inverter - Google Patents
Paralleled current sharing control method of photovoltaic inverter Download PDFInfo
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- CN104410312A CN104410312A CN201410698966.7A CN201410698966A CN104410312A CN 104410312 A CN104410312 A CN 104410312A CN 201410698966 A CN201410698966 A CN 201410698966A CN 104410312 A CN104410312 A CN 104410312A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/493—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode the static converters being arranged for operation in parallel
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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 invention discloses a paralleled current sharing control method of a photovoltaic inverter. By the method, a current momentary value is controlled in a rotation transformation manner. Compared with the traditional method by which current sharing is carried out on the basis of effective values, the paralleled current sharing control method is high in dynamic response speed. A closed-loop current sharing adjusting mode is used, the dynamic performance and the steady-state performance are high; after current sharing is performed on the photovoltaic inverter, ring current of a system is reduced obviously, and the system can run stably and reliably; extra hardware is not required, fault points are reduced, and the cost and the size of the system are prevented from being increased; and an adjusting mode is flexible, and load distribution of various power units can be adjusted flexibly as needed.
Description
Technical field
The present invention relates to photovoltaic DC-to-AC converter technical field, particularly relate to a kind of photovoltaic DC-to-AC converter current sharing control method.
Background technology
Adopt multiple power cell in parallel thus realize the developing direction that high-power photovoltaic inverter is photovoltaic DC-to-AC converter from now on, and the key of many power cells parallel connection is exactly each power cell load-sharing.Parallel connection research at present for photovoltaic DC-to-AC converter is less, is generally the research for voltage source Current Sharing Technology.Voltage source parallel current-sharing method, mainly contains following several: one, current-limiting inductance method: the method is simple, easily realizes.But add hardware cost, also unfavorable to increase system efficiency, and also in order to take into account dynamically and steady-state behaviour, inductance value must consider compromise and select.Two, electric current automatic current equalizing method: average current is issued each power cell by current equalizing bus bar, utilizes the electric current of this unit and the deviation of average current to adjust output, reaches the object of current-sharing.But when current equalizing bus bar is short-circuited or have power cell not work, the method is by cisco unity malfunction.Other current-sharing control method is also just like external characteristic droop method, active reactive method etc., but these methods are all for voltage source parallel connection, and has respective limitation, is not suitable for directly applying to photovoltaic system.
Summary of the invention
The object of the invention is to, by a kind of photovoltaic DC-to-AC converter current sharing control method, solve the problem that above background technology part is mentioned.
For reaching this object, the present invention by the following technical solutions:
A kind of photovoltaic DC-to-AC converter current sharing control method, it comprises the steps:
The real component of output current and idle component are sent to other power cell by CAN communication by each power cell of A, formation photovoltaic DC-to-AC converter;
B, power cell calculate the current information of other power cell transmission received and the current information of self, and obtain average current, described current information comprises real component and the idle component of output current;
C, regulated by equal throttle regulator, adjustment output current, realizes current-sharing.
Especially, described steps A specifically comprises: each power cell forming photovoltaic DC-to-AC converter carries out rotation transformation to current instantaneous value, obtains D axle, Q axle real component and idle component, and described real component and idle component are sent to other power cell.
Especially, described equal throttle regulator includes but not limited to closed loop pi regulator and hysteresis regulator.
The photovoltaic DC-to-AC converter current sharing control method tool that the present invention proposes has the following advantages: one, by rotation transformation, control current instantaneous value, adopts effective value to carry out compared with current-sharing, rapid dynamic response speed with tradition; Two, adopt closed loop current-sharing to regulate, have good dynamic and steady-state behaviour, after current-sharing, system circulation obviously reduces, and is beneficial to system stability reliability service.Three, additionally do not increase any hardware, not only reduce fault point, and avoid the rising of system cost and the large of system bulk increasing; Four, regulative mode is flexible, and the load that can adjust flexibly as required between each power cell distributes.
Accompanying drawing explanation
The photovoltaic DC-to-AC converter current sharing control process schematic that Fig. 1 provides for the embodiment of the present invention 1;
The photovoltaic DC-to-AC converter load-sharing process schematic in parallel that Fig. 2 provides for the embodiment of the present invention 2.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.Be understandable that, specific embodiment described herein is only for explaining the present invention, but not limitation of the invention.It also should be noted that, for convenience of description, illustrate only part related to the present invention in accompanying drawing but not full content, unless otherwise defined, all technology used herein and scientific terminology are identical with belonging to the implication that those skilled in the art of the present invention understand usually.The object of term used in the description of the invention herein just in order to describe specific embodiment, is not intended to be restriction the present invention.Term as used herein " and/or " comprise arbitrary and all combinations of one or more relevant Listed Items.
Embodiment one
In the present embodiment, photovoltaic DC-to-AC converter current sharing control method specifically comprises the steps:
The real component of output current and idle component are sent to other power cell by CAN communication by each power cell of S101, formation photovoltaic DC-to-AC converter.
During specific implementation, each power cell forming photovoltaic DC-to-AC converter carries out rotation transformation to current instantaneous value, obtains D axle, Q axle real component and idle component, and described real component and idle component are sent to other power cell.
S102, power cell calculate the current information of other power cell transmission received and the current information of self, and obtain average current, described current information comprises real component and the idle component of output current.
S103, regulated by equal throttle regulator, adjustment output current, realizes current-sharing.Wherein, described equal throttle regulator includes but not limited to closed loop pi regulator and hysteresis regulator.
As shown in Figure 1, in the present embodiment, I
1i
nfor the current instantaneous value of each power cell, obtain D axle, Q axle real component and idle component after rotation transformation, Averaeg represents that the current information that send other power cell of receiving and the current information of self calculate, and obtains average current, I
avgfor mean value and the described average current of each power cell output current, PI is represented and to be regulated by closed loop pi regulator, changes current reference I
ref, realize current-sharing.Current loop represents circulation.
It should be noted that, the present invention is not limited to the application of sharing control, also may be used for the control such as load distribution etc. to electric current correlated variables.
Embodiment two
As shown in Figure 2, S
1s
nfor the variable relevant to output current, this variable is instantaneous power in an embodiment, and Calculate represents the load Distribution Calculation (detailed process and embodiment one method duplicate, and do not repeat them here) of each power cell, S
avgfor the mean value of each power cell power output, S
reffor power reference, Controller can be any one of closed loop pi regulator, hysteresis regulator or other adjuster, and Controlloop represents monocycle or the dicyclo regulon of control object.The present embodiment adopts instantaneous power to achieve and regulates the accurate load distribution of each power cell.
Technical scheme tool of the present invention has the following advantages: one, by rotation transformation, control current instantaneous value, adopts effective value to carry out compared with current-sharing, rapid dynamic response speed with tradition; Two, adopt closed loop current-sharing to regulate, have good dynamic and steady-state behaviour, after current-sharing, system circulation obviously reduces, and is beneficial to system stability reliability service.Three, additionally do not increase any hardware, not only reduce fault point, and avoid the rising of system cost and the large of system bulk increasing; Four, regulative mode is flexible, and the load that can adjust flexibly as required between each power cell distributes.
Note, above are only preferred embodiment of the present invention and institute's application technology principle.Skilled person in the art will appreciate that and the invention is not restricted to specific embodiment described here, various obvious change can be carried out for a person skilled in the art, readjust and substitute and can not protection scope of the present invention be departed from.Therefore, although be described in further detail invention has been by above embodiment, the present invention is not limited only to above embodiment, when not departing from the present invention's design, can also comprise other Equivalent embodiments more, and scope of the present invention is determined by appended right.
Claims (3)
1. a photovoltaic DC-to-AC converter current sharing control method, is characterized in that, comprises the steps:
The real component of output current and idle component are sent to other power cell by CAN communication by each power cell of A, formation photovoltaic DC-to-AC converter;
B, power cell calculate the current information of other power cell transmission received and the current information of self, and obtain average current, described current information comprises real component and the idle component of output current;
C, regulated by equal throttle regulator, adjustment output current, realizes current-sharing.
2. photovoltaic DC-to-AC converter current sharing control method according to claim 1, it is characterized in that, described steps A specifically comprises: each power cell forming photovoltaic DC-to-AC converter carries out rotation transformation to current instantaneous value, obtain D axle, Q axle real component and idle component, and described real component and idle component are sent to other power cell.
3. the photovoltaic DC-to-AC converter current sharing control method according to any one of claim 1 or 2, is characterized in that, described equal throttle regulator includes but not limited to closed loop pi regulator and hysteresis regulator.
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| CN201410698966.7A CN104410312A (en) | 2014-11-26 | 2014-11-26 | Paralleled current sharing control method of photovoltaic inverter |
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| CN201410698966.7A CN104410312A (en) | 2014-11-26 | 2014-11-26 | Paralleled current sharing control method of photovoltaic inverter |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105634094A (en) * | 2016-01-29 | 2016-06-01 | 山东鲁能智能技术有限公司 | Current-equalizing and grouping method for two-way charger |
| CN106159934A (en) * | 2016-06-30 | 2016-11-23 | 温州大学 | Based on efficiency and the parallel operation system optimized control method of current-sharing index golden section |
| CN109066820A (en) * | 2018-10-23 | 2018-12-21 | 四川大学 | Shunt chopper power-sharing device and control method based on electric current droop characteristic |
| CN109672357A (en) * | 2018-12-14 | 2019-04-23 | 苏州诺威特测控科技有限公司 | A kind of bearing calibration of the more power module parallel current imbalances of single crystal growing furnace power supply |
| CN111628527A (en) * | 2020-06-12 | 2020-09-04 | 许继电源有限公司 | Composite circulating current restraining method and device for shore power supply system |
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| CN109066820A (en) * | 2018-10-23 | 2018-12-21 | 四川大学 | Shunt chopper power-sharing device and control method based on electric current droop characteristic |
| CN109672357A (en) * | 2018-12-14 | 2019-04-23 | 苏州诺威特测控科技有限公司 | A kind of bearing calibration of the more power module parallel current imbalances of single crystal growing furnace power supply |
| CN111628527A (en) * | 2020-06-12 | 2020-09-04 | 许继电源有限公司 | Composite circulating current restraining method and device for shore power supply system |
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Address after: 214174 Jiangsu Province Economic Development Zone, Huishan wind power science and Technology Industrial Park, wind energy road, No. 1 standard factory building Applicant after: SINENG ELECTRIC Co.,Ltd. Address before: 214174 Jiangsu Province Economic Development Zone, Huishan wind power science and Technology Industrial Park, wind energy road, No. 1 standard factory building Applicant before: Top energy Electric Co.,Ltd. Address after: 214174 Jiangsu Province Economic Development Zone, Huishan wind power science and Technology Industrial Park, wind energy road, No. 1 standard factory building Applicant after: Top energy Electric Co.,Ltd. Address before: 214174 Jiangsu Province Economic Development Zone, Huishan wind power science and Technology Industrial Park, wind energy road, No. 1 standard factory building Applicant before: WUXI SINENG NEW ENERGY CO.,LTD. |
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Application publication date: 20150311 |
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