CN102857082B - Harmonic suppression method of grid-connected photovoltaic inverter - Google Patents
Harmonic suppression method of grid-connected photovoltaic inverter Download PDFInfo
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- CN102857082B CN102857082B CN201210313290.6A CN201210313290A CN102857082B CN 102857082 B CN102857082 B CN 102857082B CN 201210313290 A CN201210313290 A CN 201210313290A CN 102857082 B CN102857082 B CN 102857082B
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- axle
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- output current
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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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- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention relates to harmonic suppression technology and especially relates to a harmonic suppression method of a grid-connected photovoltaic inverter. The invention solves the problem that the grid-connected photovoltaic inverter generates excessive distortion of grid-connected current during the grid-connected operation process. The harmonic suppression method of the grid-connected photovoltaic inverter comprises the following steps: (1) sampling the voltage of a three-phase output wire of the grid-connected photovoltaic inverter; (2) sampling the three-phase output current of the grid-connected photovoltaic inverter; (3) performing Park conversion on I alpha and I beta; (4) performing low pass filtering on Id, and performing low pass filtering on Iq; (5) subtracting Id1 from Id; and subtracting Iq1 from Iq; and (6) performing PI regulation on Idx and a preset reference value Idref, and performing PI regulation on Iqx and a preset reference value Iqref. The harmonic suppression method provided by the invention is applicable to the grid-connected operation of grid-connected photovoltaic inverters.
Description
Technical field
The present invention relates to harmonic suppression technique, specifically a kind of harmonic suppressing method of parallel networking type photovoltaic inverter.
Background technology
Solar energy power generating is the important component part of new forms of energy, is considered to new energy technology the most promising on our times.The issue of the promulgation of various countries' Renewable Energy Law, the development of photovoltaic roof plan, various reduction or remission of taxes policy and subsidy policy and rate for incorporation into the power network, all greatly facilitates the development of photovoltaic market.Along with the development of photovoltaic market and the continuous increase of installed capacity, the shock effect of parallel networking type photovoltaic inverter to electrical network also increases day by day, makes all to propose more requirement to parallel networking type photovoltaic inverter access electrical network in world wide.Specifically, parallel networking type photovoltaic inverter is when realizing being incorporated into the power networks, if do not detect in real time the harmonic current of parallel networking type photovoltaic inverter and suppress, parallel networking type photovoltaic inverter just can inject excessive harmonic current to electrical network, cause grid-connected current excessive distortion, and then adverse effect is caused to other equipment being connected to electrical network.Based on this, be necessary that a kind of harmonic current for parallel networking type photovoltaic inverter of invention detects and suppressing method in real time, to solve parallel networking type photovoltaic inverter in the problem realizing causing when being incorporated into the power networks grid-connected current excessive distortion.
Summary of the invention
The present invention, in order to solve parallel networking type photovoltaic inverter in the problem realizing causing when being incorporated into the power networks grid-connected current excessive distortion, provides a kind of harmonic suppressing method of parallel networking type photovoltaic inverter.
The present invention adopts following technical scheme to realize: a kind of harmonic suppressing method of parallel networking type photovoltaic inverter, the method adopts following steps to realize: 1) sample to the three-phase output voltage of parallel networking type photovoltaic inverter, and the fundamental frequency of three-phase output voltage that obtains of calculating sampling and phase value θ; 2) the three-phase output current of parallel networking type photovoltaic inverter is sampled, and 3/2 conversion is carried out to the three-phase output current obtained of sampling, obtain three-phase output current and rotate the value I corresponding to α axle in two phase coordinate systems at alpha-beta
α, three-phase output current rotates in two phase coordinate systems at alpha-beta and corresponds to the value I of β axle
β; 3) to I
αand I
βcarry out Park conversion (Park Transformation), obtain the value I that three-phase output current corresponds to d axle and q axle in d-q rest frame
dand I
q; 4) to I
dcarry out low-pass filtering, obtain fundametal compoment in three-phase output current and correspond to the value I of d axle
dl; To I
qcarry out low-pass filtering, obtain fundametal compoment in three-phase output current and correspond to the value I of q axle
ql; 5) I is used
ddeduct I
dl, obtain harmonic component in three-phase output current and correspond to the value I of d axle
dx; Use I
qdeduct I
ql, obtain harmonic component in three-phase output current and correspond to the value I of q axle
qx; 6) to I
dxwith given reference value I
drefcompare, and compared result carries out PI adjustment, obtain harmonic wave d axle compensate component V
db; To I
qxwith given reference value I
qrefcompare, and compared result carries out PI adjustment, obtain harmonic wave q axle compensate component V
qb; 7) to V
dbwith d axle command signal U
dsuperpose, obtain d axle control command U
dr; To V
qbwith q axle command signal U
qsuperpose, obtain q axle control command U
qr; 8) to U
drand U
qrcarry out anti-Park conversion (anti-Park Transformation), obtain α axle and β axle control command U
αand U
β; 9) to U
αand U
βcarry out SVPWM algorithm (spatial vector pulse width modulation algorithm) to calculate, obtain pwm pulse signal; 10) dead area compensation is carried out to pwm pulse signal, obtain pwm pulse drive singal; 11) by pwm pulse drive singal driving power device.
The harmonic suppressing method of a kind of parallel networking type photovoltaic inverter of the present invention is based on brand-new control principle, achieve the harmonic current components of effective Detection and Extraction parallel networking type photovoltaic inverter and suppressed, effectively reduce grid-connected current aberration rate thus, effectively prevent parallel networking type photovoltaic inverter, when realization is incorporated into the power networks, adverse effect is caused to other equipment being connected to electrical network.
The present invention efficiently solves parallel networking type photovoltaic inverter in the problem realizing causing when being incorporated into the power networks grid-connected current excessive distortion, is applicable to being incorporated into the power networks of parallel networking type photovoltaic inverter.
Accompanying drawing explanation
Fig. 1 is the theory diagram of step 1)-step 6) of the present invention.
Fig. 2 is the theory diagram of step 7)-step 11) of the present invention.
Embodiment
A harmonic suppressing method for parallel networking type photovoltaic inverter, the method adopts following steps to realize:
1) three-phase output voltage of parallel networking type photovoltaic inverter is sampled, and the fundamental frequency of three-phase output voltage that obtains of calculating sampling and phase value θ;
2) the three-phase output current of parallel networking type photovoltaic inverter is sampled, and 3/2 conversion is carried out to the three-phase output current obtained of sampling, obtain three-phase output current and rotate the value I corresponding to α axle in two phase coordinate systems at alpha-beta
α, three-phase output current rotates in two phase coordinate systems at alpha-beta and corresponds to the value I of β axle
β;
3) to I
αand I
βcarry out Park conversion, obtain the value I that three-phase output current corresponds to d axle and q axle in d-q rest frame
dand I
q;
4) to I
dcarry out low-pass filtering, obtain fundametal compoment in three-phase output current and correspond to the value I of d axle
dl; To I
qcarry out low-pass filtering, obtain fundametal compoment in three-phase output current and correspond to the value I of q axle
ql;
5) I is used
ddeduct I
dl, obtain harmonic component in three-phase output current and correspond to the value I of d axle
dx; Use I
qdeduct I
ql, obtain harmonic component in three-phase output current and correspond to the value I of q axle
qx;
6) to I
dxwith given reference value I
drefcompare, and compared result carries out PI adjustment, obtain harmonic wave d axle compensate component V
db; To I
qxwith given reference value I
qrefcompare, and compared result carries out PI adjustment, obtain harmonic wave q axle compensate component V
qb;
7) to V
dbwith d axle command signal U
dsuperpose, obtain d axle control command U
dr; To V
qbwith q axle command signal U
qsuperpose, obtain q axle control command U
qr;
8) to U
drand U
qrcarry out anti-Park conversion, obtain α axle and β axle control command U
αand U
β;
9) to U
αand U
βcarry out the calculating of SVPWM algorithm, obtain pwm pulse signal;
10) dead area compensation is carried out to pwm pulse signal, obtain pwm pulse drive singal;
11) by pwm pulse drive singal driving power device.
During concrete enforcement, in described step 1), by the three-phase output line voltage U of phase-locked loop to parallel networking type photovoltaic inverter
u, U
v, U
wsample, and by three-phase output line voltage U that phase-locked loop calculating sampling obtains
u, U
v, U
wfundamental frequency and phase value θ.Described step 2) in, to the three-phase output current phase I of parallel networking type photovoltaic inverter
u, I
v, I
wsample, and to the three-phase output current phase I obtained that samples
u, I
v, I
wcarry out 3/2 conversion.
Claims (1)
1. a harmonic suppressing method for parallel networking type photovoltaic inverter, is characterized in that: the method adopts following steps to realize:
1) three-phase output voltage of parallel networking type photovoltaic inverter is sampled, and the fundamental frequency of three-phase output voltage that obtains of calculating sampling and phase value θ;
2) the three-phase output current of parallel networking type photovoltaic inverter is sampled, and 3/2 conversion is carried out to the three-phase output current obtained of sampling, obtain three-phase output current and rotate the value I corresponding to α axle in two phase coordinate systems at alpha-beta
α, three-phase output current rotates in two phase coordinate systems at alpha-beta and corresponds to the value I of β axle
β;
3) to I
αand I
βcarry out Park conversion, obtain the value I that three-phase output current corresponds to d axle and q axle in d-q rest frame
dand I
q;
4) to I
dcarry out low-pass filtering, obtain fundametal compoment in three-phase output current and correspond to the value I of d axle
dl; To I
qcarry out low-pass filtering, obtain fundametal compoment in three-phase output current and correspond to the value I of q axle
ql;
5) I is used
ddeduct I
dl, obtain harmonic component in three-phase output current and correspond to the value I of d axle
dx; Use I
qdeduct I
ql, obtain harmonic component in three-phase output current and correspond to the value I of q axle
qx;
6) to I
dxwith given reference value I
drefcompare, and compared result carries out PI adjustment, obtain harmonic wave d axle compensate component V
db; To I
qxwith given reference value I
qrefcompare, and compared result carries out PI adjustment, obtain harmonic wave q axle compensate component V
qb;
7) to V
dbwith d axle command signal U
dsuperpose, obtain d axle control command U
dr; To V
qbwith q axle command signal U
qsuperpose, obtain q axle control command U
qr;
8) to U
drand U
qrcarry out anti-Park conversion, obtain α axle and β axle control command U
αand U
β;
9) to U
αand U
βcarry out the calculating of SVPWM algorithm, obtain pwm pulse signal;
10) dead area compensation is carried out to pwm pulse signal, obtain pwm pulse drive singal;
11) by pwm pulse drive singal driving power device.
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| CN201210313290.6A CN102857082B (en) | 2012-08-30 | 2012-08-30 | Harmonic suppression method of grid-connected photovoltaic inverter |
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|---|---|---|---|
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| CN102857082B true CN102857082B (en) | 2015-04-22 |
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| CN103344866B (en) * | 2013-05-17 | 2016-12-28 | 湖南大学 | A kind of open fault diagnostic method of permanent magnet direct-drive wind power generation system current transformer |
| CN106160432B (en) * | 2015-04-01 | 2020-02-21 | 国家能源投资集团有限责任公司 | Control method of multi-level converter |
| CN104953801B (en) * | 2015-07-17 | 2017-06-23 | 清华大学 | Voltage-source type combining inverter current harmonics elimination device and method |
| CN106374492B (en) * | 2016-10-11 | 2019-01-29 | 杭州电力设备制造有限公司 | A kind of method and device of single-phase star-star connection Load harmonic compensation |
| JP7042568B2 (en) * | 2017-07-28 | 2022-03-28 | 澤藤電機株式会社 | Motor control device and motor control method |
| CN109639215A (en) * | 2018-12-19 | 2019-04-16 | 中国科学院电工研究所 | A kind of three phase alternating current motor current harmonics suppressing method |
| CN112165263B (en) * | 2020-09-21 | 2022-04-12 | 哈尔滨工程大学 | Current harmonic suppression method for three-phase VIENNA rectifier |
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| CN102075108A (en) * | 2011-01-20 | 2011-05-25 | 哈尔滨工业大学 | Capacitance current feedforward control method for grid-connected inverter with LCL filter |
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| JP5644396B2 (en) * | 2010-08-06 | 2014-12-24 | 株式会社明電舎 | Harmonic current suppression device and harmonic current suppression method for power converter |
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|---|---|---|---|---|
| CN102075108A (en) * | 2011-01-20 | 2011-05-25 | 哈尔滨工业大学 | Capacitance current feedforward control method for grid-connected inverter with LCL filter |
Non-Patent Citations (2)
| Title |
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| 基于DSP的三相光伏并网逆变器控制系统设计与实现;石昆等;《电子器件》;20110630;第34卷(第3期);第273-277页 * |
| 王兆安.谐波抑制和无功功率补偿.《谐波抑制和无功功率补偿》.机械工业出版社,2006,第220-232、257-258、271-278页. * |
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Address after: 044500 Yongji City, Shanxi Province, the city of motor street, No. 18, No. Patentee after: CRRC YONGJI ELECTRIC CO., LTD. Address before: 044500 Yongji City, Shanxi Province, the city of motor street, No. 18, No. Patentee before: Yongji Xinshisu Motor Electrical Appliance Co., Ltd. |