CN101969272B - Grid-connected current control device of photovoltaic inverter - Google Patents

Grid-connected current control device of photovoltaic inverter Download PDF

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CN101969272B
CN101969272B CN201010288712XA CN201010288712A CN101969272B CN 101969272 B CN101969272 B CN 101969272B CN 201010288712X A CN201010288712X A CN 201010288712XA CN 201010288712 A CN201010288712 A CN 201010288712A CN 101969272 B CN101969272 B CN 101969272B
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current
grid
control
connected current
point
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CN101969272A (en
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肖寅东
田书林
黄建国
刘科
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University of Electronic Science and Technology of China
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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
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    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers

Abstract

The invention discloses a kind of grid-connected current control device of photovoltaic inverter, are sampled by current detection circuit to grid-connected current, and current waveform is divided into M point according to its corresponding phase and carries out PI control respectively, wherein reference value
Figure DSA00000279345800011
Also corresponding with the moment phase, the input of PI control is current sampling data and current reference value of the current detection circuit to each phase It is compared to obtain current error
Figure DSA00000279345800013
Error signal Through PI controlling unit generate control amount em, control amount em with The total control amount Em of synthesis passes through pulse width modulating signal generation circuit again and generates the on-off time ratio that generation duty ratio K goes power switch tube in control inversion bridge circuit with the pulse width modulating signal PWM that the total control amount Em of synthesis changes, to reach the control to grid-connected current, make to export grid-connected current with network voltage with the same phase of frequency, while also can control grid-connected current and reaching desired expectation electric current peak I peak.

Description

A kind of grid-connected current control device of photovoltaic inverter
Technical field
The invention belongs to photovoltaic inversion grid connection electricity generation system technical field, more specifically say, relate to a kind of grid-connected current control device of photovoltaic inverter.
Background technology
The photovoltaic contravariant generating system is paid close attention to by the many countries in the whole world at present, and photovoltaic DC-to-AC converter has also obtained very large development as the key component of photovoltaic inversion grid connection electricity generation system.Generally, as shown in Figure 1, photovoltaic inversion grid connection electricity generation system all is comprised of solar panel array 1, photovoltaic DC-to-AC converter 2.Wherein, photovoltaic DC-to-AC converter 2 comprises MPPT maximum power point tracking (MPPT) module 201, bus circuit 202, inverter bridge circuit 203 and control circuit 204 parts, and function converts solar energy into electrical energy exactly and Energy transfer is arrived electrical network 3.
Fig. 1 is the basic block diagram of photovoltaic inversion grid connection electricity generation system.The function of solar panel array 1 converts solar energy into electrical energy exactly, MPPT maximum power point tracking (MPPT) module 201 directly links to each other with solar panel array 1, to regulate the operating state of solar panel, solar panel is operated on the maximum power point.Bus circuit 202 links to each other with solar panel array 1 by the booster circuit on the MPPT maximum power point tracking module 201, system begins to carry out Energy Transfer when its busbar voltage is elevated to the value of appointment, and the power delivery that solar panel is transformed is to inverter bridge circuit 203.Inverter bridge circuit 203 is responsible for the direct current that bus circuit 202 transmits is converted to alternating current (normally 50Hz civil power).Control circuit 204 is keys of whole photovoltaic inversion grid connection electricity generation system steady operation, and the realization of maximal power tracing, the balance of busbar voltage are controlled quietly, the tracking of inverter bridge circuital current control all will rely on control circuit 204 to carry out computing and scheduling.
It is to realize the key of generating electricity by way of merging two or more grid systems that the grid-connected current of photovoltaic DC-to-AC converter 2 is followed the tracks of control, obtain and line voltage with the grid-connected current of homophase frequently, and guarantee its wave distortion within prescribed limit, be that photovoltaic DC-to-AC converter is normal, the Focal point and difficult point of steady operation.Common grid-connected current control method has indirectly and direct two kinds of control modes, and with respect to the indirect current control method, directly control has the advantages such as control circuit is simple, low to the dependence of system parameters, system's rapid dynamic response speed.Yet not only precision is not high for direct PI current control method commonly used, and the phase shift of meeting generation current, can cause the operating efficiency of whole inverter lower, and the problems such as phase error and wave distortion appear in grid-connected current.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, proposes a kind of grid-connected current control device of photovoltaic inverter, and grid-connected current is reached with line voltage fast and exactly with the frequency homophase.
For achieving the above object, grid-connected current control device of photovoltaic inverter of the present invention is characterized in that, comprising:
One current detection circuit is used for grid-connected current I NetSample, the sampling period is T, then obtains M current sampling data in the grid-connected current primitive period L
Figure BSA00000279346100021
Wherein, M=L/T, m=0,1,2 ..., M-1, current sampling data
Figure BSA00000279346100022
0 phase point of corresponding grid-connected current first-harmonic;
One comparator is used for the current sampling data to each phase place
Figure BSA00000279346100023
Expectation electric current with corresponding phase
Figure BSA00000279346100024
Compare the output current error
Figure BSA00000279346100025
Wherein,
Figure BSA00000279346100027
I PeakBe the expectation current peak;
One PI controller is used for according to current error
Figure BSA00000279346100028
Produce controlled quentity controlled variable e m
One add circuit is used for controlled quentity controlled variable e mFeedforward amount with line voltage
Figure BSA00000279346100029
Carry out addition, synthetic master control amount E m
One pulse width modulating signal produces circuit, is used for according to synthetic master control amount E m, produce duty ratio K with synthetic master control amount E mThe pulse width modulating signal PWM that changes goes to control the on-off time ratio of power switch pipe in the inverter bridge circuit;
Detect certain some current sampling data of grid-connected current first-harmonic when current detection circuit
Figure BSA000002793461000210
Expectation electric current less than corresponding phase
Figure BSA000002793461000211
The time, the output current error
Figure BSA000002793461000212
For just, the PI controller produces positive controlled quentity controlled variable e mFeedforward amount with line voltage Carry out addition, synthetic master control amount E mIncrease, like this, the duty ratio K of this pulse width modulating signal PWM increases, the grid-connected current of this point
Figure BSA000002793461000214
Increase, until with the expectation electric current of corresponding phase
Figure BSA000002793461000215
Equate; Otherwise, detect certain some current sampling data of grid-connected current first-harmonic when current detection circuit
Figure BSA000002793461000216
Expectation electric current greater than corresponding phase
Figure BSA000002793461000217
The time, the output current error
Figure BSA000002793461000218
For negative, the PI controller produces negative controlled quentity controlled variable e mFeedforward amount with line voltage
Figure BSA000002793461000219
Carry out addition, synthetic master control amount E mReduce, like this, the duty ratio K of this pulse width modulating signal PWM reduces, the grid-connected current of this point
Figure BSA000002793461000220
Reduce, until with the expectation electric current of corresponding phase
Figure BSA000002793461000221
Equate; Like this, M point in the grid-connected current primitive period L all carries out identical control, so that output grid-connected current and line voltage with the frequency homophase, reach the current peak of expectation simultaneously.
Goal of the invention of the present invention is achieved in that
Grid-connected current control device of photovoltaic inverter of the present invention is sampled to grid-connected current by current detection circuit, current waveform is divided into M point according to its corresponding phase place carries out respectively PI control, wherein reference value
Figure BSA00000279346100031
Also phase place is corresponding constantly with this, and the input of PI control is that current detection circuit is to current sampling data and the current reference value of each phase place
Figure BSA00000279346100032
Compare and obtain current error
Figure BSA00000279346100033
Error signal
Figure BSA00000279346100034
Produce controlled quentity controlled variable e through the PI controlling unit m, controlled quentity controlled variable e mWith
Figure BSA00000279346100035
Synthetic master control amount E mProduce circuit evolving by pulse width modulating signal again and produce duty ratio K with synthetic master control amount E mThe pulse width modulating signal PWM that changes goes to control the on-off time ratio of power switch pipe in the inverter bridge circuit, thereby reach the control to grid-connected current, make output grid-connected current and line voltage with the frequency homophase, also can control the expectation current peak I that grid-connected current reaches expectation simultaneously Peak
Description of drawings
The basic block diagram of Fig. 1 photovoltaic inversion grid connection electricity generation system;
Fig. 2 is the theory diagram of a kind of embodiment of grid-connected current control device of photovoltaic inverter of the present invention;
Fig. 3 postpones the control schematic diagram.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described, so that those skilled in the art understands the present invention better.What need to point out especially is that in the following description, when perhaps the detailed description of known function and design can desalinate main contents of the present invention, these were described in here and will be left in the basket.
Embodiment
Fig. 2 is the theory diagram of a kind of embodiment of grid-connected current control device of photovoltaic inverter of the present invention.
In the present embodiment, as shown in Figure 2, grid-connected current control device of photovoltaic inverter of the present invention comprises that current detection circuit 2041, comparator 2042, PI controller 2043, add circuit 2044 and pulse width modulating signal produce circuit 2045.
As shown in Figure 2,2041 couples of grid-connected current I of current detection circuit NetSample, the sampling period is T, then obtains M current sampling data in the grid-connected current primitive period L
Figure BSA00000279346100036
Wherein, M=L/T, m=0,1,2 ..., M-1, current sampling data
Figure BSA00000279346100037
0 phase point of corresponding grid-connected current first-harmonic.
The current sampling data of 2042 pairs of each phase places of comparator
Figure BSA00000279346100041
Expectation electric current with corresponding phase
Figure BSA00000279346100042
Compare the output current error
Figure BSA00000279346100043
Wherein,
Figure BSA00000279346100045
I PeakBe the expectation current peak;
Then in PI controller 2043, according to current error
Figure BSA00000279346100046
Produce controlled quentity controlled variable e mDeliver to add circuit 2044, be used for controlled quentity controlled variable e mFeedforward amount with line voltage Carry out addition, synthetic master control amount E m
Pulse width modulating signal produces circuit 2045 according to synthetic master control amount E m, produce duty ratio K with synthetic master control amount E mThe pulse width modulating signal PWM that changes goes to control the on-off time ratio of power switch pipe in the inverter bridge circuit 203.Thereby reach the control to grid-connected current, make output grid-connected current I NetWith line voltage together frequency homophase, also can control the expectation current peak I that grid-connected current reaches expectation simultaneously PeakGrid-connected current control device of photovoltaic inverter of the present invention places photovoltaic DC-to-AC converter, as the part of its control circuit.
Pulse width modulating signal produces circuit 2045 input control amounts, master control amount E mBe to be formed by two parts addition: a part is the feedforward amount of line voltage Another part is the output e of PI controller 2043 among the figure mThe feedforward amount of line voltage
Figure BSA00000279346100049
Account for master control amount E mMain ratio, it pours in down a chimney photovoltaic DC-to-AC converter for generation of stable voltage and the line voltage unlikely line voltage that maintains an equal level.PI controller control output variable mainly for generation of with the regulation output current waveform, the ratio that its numerical value accounts for the master control amount is less, and requires control precision higher.Therefore, the gain of PI controller proportional integral Kp is got less value and is conducive to improve Systems balanth.
The amplitude of grid-connected current determines by the difference of the equivalent output voltage of power switch pipe (IGBT) and line voltage, can control its equivalent output voltage by the time of power switch closed and disconnected.Because the control frequency of power switch is far above the frequency of grid-connected current, in the control procedure of integral body, the action of each data sampling, computing and power switch all is incoherent, so controller also is independently to the control of grid-connected current on each phase place.Therefore, can adopt grid-connected current control device of photovoltaic inverter of the present invention to grid-connected current I NetControl, to have eliminated the impact between the out of phase point, make control more accurate, the output waveform better effects if.
As shown in Figure 2, in the process of photovoltaic DC-to-AC converter work, because control system itself is from grid-connected current I NetSample data are processed, producing pulse width modulating signal PWM controls power switch pipe and needs the regular hour again, and also have delay on the inductance that is incorporated into the power networks, so can not within the same cycle, finish sampling, computing and the control of some phase point electric currents.For this problem, in the present embodiment, as shown in Figure 2, adopted the method that postpones control: on the basis of general PI control principle, PI controller 2043 is improved, in PI controller 2043, added delayer Z behind the integrator -N, delayer Z -NExport one the road and feed back to input; Current sampling data Process and the expectation electric current of joining corresponding phase Compare the output current error Then 2043 pairs of current errors of PI controller
Figure BSA00000279346100054
Do the PI control algorithm, wherein, integration amount postpones N sampled point in delayer, like this, and the controlled quentity controlled variable e of PI controller 2043 outputs mProlong N sampled point, as the control of the corresponding phase point grid-connected current in next cycle.Kp among Fig. 2 and Ki represent respectively ratio and the integral parameter of PI controller.
Fig. 3 postpones the control schematic diagram.
Add delay in integral element as shown in Figure 3, offset the controlled quentity controlled variable hysteresis that various time delays cause, reduced owing to the corresponding system mistake that makes mistakes and cause with working control point of sampled point.Among Fig. 2, being a primitive period L between working control point and the sampled point, is the delay that system control itself produces between working control point and the control point.Relevant with the control lag n of each primitive period sampling number M and system itself for choosing of delay sampling points N, the unit of n is a sampled point number, and the grid-connected current primitive period is L, and the sampling period is T, then:
Definite formula of delay sampling points N is:
N＝M-n
Under large inertia environment, export in advance controlled quentity controlled variable and in actual output point sampling, can farthest reduce the problem that lose at sampling and control point.In addition, the proportional component proportion is very small in controlled quentity controlled variable, does not therefore need specially to add to postpone to control.
The present invention is applied in the 5000w solar energy inversion system, can obtain wave distortion THD less than 2% output current, and the cycle of current first harmonics is 0.02s in this system, and the cycle of sampling is 55.5 μ s, and the delay n of control has selected 4, so the size of N is 356.
It is simple that the independent phase PI control method that the present invention adopts has an algorithm, is easy to digitlization and High-speed Control, and robustness is good, and reliability is high, the advantage that parameter is easily adjusted.Simultaneously branch PI control combines with delay control method, eliminated that phase place that integral element brings to system lags behind and problem that the easy conventional PI control such as unstable of control system can't overcome, precise control and the stability of system have been improved, thereby can make the stable control grid-connected current of following the tracks of fast of control system, make it reach fast and accurately requirement.Simultaneously, tracking power network current speed is fast, and the output current wave harmonic distortion is little; This control device is stable, and departure is little, accuracy is high.
Although the above is described the illustrative embodiment of the present invention; so that the technical staff of present technique neck understands the present invention; but should be clear; the invention is not restricted to the scope of embodiment; to those skilled in the art; as long as various variations appended claim limit and the spirit and scope of the present invention determined in, these variations are apparent, all utilize innovation and creation that the present invention conceives all at the row of protection.

Claims (2)

1. a grid-connected current control device of photovoltaic inverter is characterized in that, comprising:
One current detection circuit is used for grid-connected current I NetSample, the sampling period is T, then obtains M current sampling data in the grid-connected current primitive period L
Figure FSB00000948711000011
Wherein, M=L/T, m=0,1,2 ..., M-1, current sampling data
Figure FSB00000948711000012
0 phase point of corresponding grid-connected current first-harmonic;
One comparator is used for the current sampling data to each phase place
Figure FSB00000948711000013
Expectation electric current with corresponding phase
Figure FSB00000948711000014
Compare the output current error Wherein,
I err m = I ref m - I net m , I ref m = Sin ( 2 * π * m M ) * I peak , I PeakBe the expectation current peak;
One PI controller is used for according to current error
Figure FSB00000948711000018
Produce controlled quentity controlled variable e m
One add circuit is used for controlled quentity controlled variable e mFeedforward amount with line voltage
Figure FSB00000948711000019
Carry out addition, synthetic master control amount E m
One pulse width modulating signal produces circuit, is used for according to synthetic master control amount E m, produce duty ratio K with synthetic master control amount E mThe pulse width modulating signal PWM that changes goes to control the on-off time ratio of power switch pipe in the inverter bridge circuit;
Detect certain some current sampling data of grid-connected current first-harmonic when current detection circuit
Figure FSB000009487110000110
Expectation electric current less than corresponding phase The time, the output current error
Figure FSB000009487110000112
For just, the PI controller produces positive controlled quentity controlled variable e mFeedforward amount with line voltage
Figure FSB000009487110000113
Carry out addition, synthetic master control amount E mIncrease, like this, the duty ratio K of this pulse width modulating signal PWM increases, the grid-connected current of this point
Figure FSB000009487110000114
Increase, until with the expectation electric current of corresponding phase
Figure FSB000009487110000115
Equate; Otherwise, detect certain some current sampling data of grid-connected current first-harmonic when current detection circuit Expectation electric current greater than corresponding phase
Figure FSB000009487110000117
The time, the output current error
Figure FSB000009487110000118
For negative, the PI controller produces negative controlled quentity controlled variable e mFeedforward amount with line voltage Carry out addition, synthetic master control amount E mReduce, like this, the duty ratio K of this pulse width modulating signal PWM reduces, the grid-connected current of this point
Figure FSB000009487110000120
Reduce, until with the expectation electric current of corresponding phase
Figure FSB000009487110000121
Equate; Like this, M point in the grid-connected current primitive period L all carries out identical control, so that output grid-connected current and line voltage with the frequency homophase, reach the current peak of expectation simultaneously.
2. grid-connected current control device of photovoltaic inverter according to claim 1 is characterized in that, in the described PI controller, has added delayer Z behind its integrator -N, delayer Z -NExport one the road and feed back to input; Current error When doing the PI control algorithm, integration amount postpones N sampled point in delayer, like this, and the controlled quentity controlled variable e of PI controller output mProlong N sampled point, as the control of the corresponding phase point grid-connected current in next cycle, wherein, the delay sampling points N is: N=M-n, n are the control lag sampled point number of system itself.
CN201010288712XA 2010-09-21 2010-09-21 Grid-connected current control device of photovoltaic inverter Expired - Fee Related CN101969272B (en)

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CN103795083B (en) * 2014-02-20 2016-01-13 新疆希望电子有限公司 Photovoltaic combining inverter grid-connected current soft start and soft stop method and system
EP3176901A1 (en) * 2015-12-01 2017-06-07 DET International Holding Limited Controller for a multiphase inverter
CN108828933B (en) * 2018-07-03 2021-06-11 唐瑭 Control method and system for improving output waveform quality of grid-connected converter
JP7262604B2 (en) * 2019-10-04 2023-04-21 新電元工業株式会社 CURRENT DETECTION DEVICE, MOTOR CONTROL DEVICE, AND CURRENT DETECTION METHOD
CN112698571B (en) * 2020-12-09 2023-01-24 河南知汇电力技术有限公司 double-PI cooperative control device and method

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Publication number Priority date Publication date Assignee Title
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