CN110380416A - A kind of energy accumulation current converter active damping resonance control method - Google Patents
A kind of energy accumulation current converter active damping resonance control method Download PDFInfo
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- CN110380416A CN110380416A CN201910709966.5A CN201910709966A CN110380416A CN 110380416 A CN110380416 A CN 110380416A CN 201910709966 A CN201910709966 A CN 201910709966A CN 110380416 A CN110380416 A CN 110380416A
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- active damping
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- energy accumulation
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
Abstract
The invention discloses a kind of energy accumulation current converter active damping resonance control methods, existing active damping control method is improved, its net-connected controller uses proportional integration PI control method, using Voltage loop, electric current loop two close cycles loop, of ac is changed into DC quantity using vector and is adjusted；Corresponding, of ac is changed into DC quantity using vector, using lead compensation controller, compensates control to the lag because of sampling time delay, digital control generation by the proportional component output in filter capacitor current feedback channel.The present invention uses lead compensation controller, compensates control to the lag because of sampling time delay, digital control generation, solves the sampling aliasing and lag issues of practical application in industry.Whole system exists from single machine resonance frequency to the inhibition of the resonance of multimachine resonance frequency wide frequency ranges after the present invention solves the problems, such as more inverter parallels, effectively inhibits harmonic wave, reduces harmonic content, improves the adaptability to wide frequency ranges.
Description
Technical field
The present invention relates to parallel network reverse technology more particularly to a kind of energy accumulation current converter active damping resonance control methods.
Background technique
For separate unit rectifier, exchange side output end mostly uses greatly multi-stage filter design scheme to increase to inverse
Become the rejection ability of device output higher hamonic wave, however this high order filter designs can make inverter system frequency band that there are resonance
Frequency point.
In terms of single inverter resonance inhibits strategy study, domestic and international research institution and scholar are directed to raising separate unit mostly
Inverter stability control conducts a research, such as the P.A.Dahono of Indonesia, the V.Blasko of Croatia and India
V.Kaura, the F.Blaabjery of Australian D.G.Holmes and Denmark, Polish M.Malinonski and Germany
S.Bernet, and the F.W.Fuchs of Germany etc., above-mentioned experts and scholars propose largely about the active damping for inhibiting resonance phenomena
Control program, such as introduces exchange side output filter capacitor current feedback loop, and networking electric current is fed back after second differential
Etc. control programs etc., and achieve certain inhibitory effect, preferably resolve the system between one-of-a-kind system and network voltage
Resonance ensure that the stable operation of separate unit grid-connected inverter system.
But, on the one hand, existing method seldom considers the execution cycle of practical controller, in virtual resistance practical application
The lack sampling Aliasing Problem of capacitance current is not accounted for；On the other hand, correlative study, which is mainly concentrated, improves separate unit gird-connected inverter
The active damping control program of system stability, for multi-computer system, due to composed single inverter control scheme,
There is significant difference in output filter structure, in this case, even if there is every inverter resonance alone to inhibit control
Scheme processed, but due to these inverter composition systems with notable difference after, respective inverter control loop, main circuit with
There will necessarily be the influence to intercouple between power network line impedance, so that the resonance suppression that original inverter has itself
Control program processed loses corresponding damping, finally causes whole system resonance.
Summary of the invention
Goal of the invention: it in view of the above problems, the present invention proposes a kind of energy accumulation current converter active damping resonance control method, adopts
With the virtual resistance method with lead compensation, lack sampling aliasing and lag in practical application in industry are solved the problems, such as.
Technical solution: to achieve the purpose of the present invention, the technical scheme adopted by the invention is that: a kind of energy accumulation current converter has
Source damped harmonic oscillation control method, comprising steps of
(1) busbar voltage U is givendc* with actual bus voltage UdcDifference, obtain inversion through PI pi controller
Device given value of current value i1*；
(2) three-phase reactor electric current i1I is transformed to through dq1d、i1q, respectively with the dq component i of inverter current given value1d*、
i1q* difference show that contravarianter voltage gives reference value U through PI pi controllerd*、Uq*；
(3) current sensor acquires filter capacitor electric current ica、icb、icc, after digital filter, electric current ica,
Icb, icc pass through proportional component again；
(4) i is transformed to through dqcd、icq；icd、icq, through advancer, advancer uses first-order lead hysteresis loop
Section obtains offset voltage and gives Ucd, Ucq；
(5)Ud*、Uq* respectively with Ucd、UcqAlgebraic addition obtains contravarianter voltage and gives revised actual value Ud、Uq；
(6) voltage gives Ud、UqU is obtained through dq inverse transformationa、ub、uc, by SVPWM module, generate pwm pulse, control three
Each switching tube work of level.
Further, the proportional integration link in the step 3 are as follows:
Wherein, KpFor the proportional control factor of capacitor current feedback, L1For current transformer filter inductance inductance value, RdFor equivalent nothing
Source damping resistance value, CfFor filtering capacitance.
Further, passive equivalence damping resistance value is 0.4 times of capacitive branch capacitive reactance XC。
Further, in the step 4, first-order lead compensation tache are as follows:
Wherein, L (s) is first-order lead compensation tache transmission function, and a is correction factor, TsFor time constant.
Further, lead compensation link parameter designing need to meet two conditions simultaneously: leading angle gets over bulky capacitor electric current
Final lag angle is smaller；Differentiation element is minimum in the amplitude-frequency gain of entire frequency band.
The utility model has the advantages that the present invention uses lead compensation controller, to the lag progress because of sampling time delay, digital control generation
Compensation control, solves the sampling aliasing and lag issues of practical application in industry.
Detailed design of the present invention parallel virtual equivalent resistance resistance value is chosen, capacitance current filter cutoff frequency is chosen and
Differentiation element parameter designing.
Whole system is in the presence of wide from single machine resonance frequency to multimachine resonance frequency after the present invention solves more inverter parallels
The resonance of frequency range inhibits problem, effectively inhibits harmonic wave, reduces harmonic content, improves the adaptability to wide frequency ranges.
Detailed description of the invention
Fig. 1 is the virtual resistance active damping resonance control block diagram with lead compensation；
Fig. 2 is lead compensation link frequency characteristic figure；
Fig. 3 is current resonance waveform at three machine parallel connection 1220Hz；
Fig. 4 be added lead compensation link active damping after three machine parallel connection 1220Hz place electric current inhibition waveform diagram.
Specific embodiment
Further description of the technical solution of the present invention with reference to the accompanying drawings and examples.
As shown in Figure 1, energy accumulation current converter active damping resonance control method of the present invention, using with lead compensation
Virtual resistance method, the specific steps are as follows:
(1) busbar voltage U is givendc* with actual bus voltage UdcDifference, obtain inversion through PI pi controller
Device given value of current value i1*；
(2) three-phase reactor electric current i1I is transformed to through dq1d、i1q, respectively with the dq component i of inverter current given value1d*、
i1q* difference show that contravarianter voltage gives reference value U through PI pi controllerd*、Uq*；
(3) current sensor acquires filter capacitor electric current ica、icb、icc, after digital filter, electric current ica,
Icb, icc pass through following proportional component:
Wherein, KpFor the proportional control factor of capacitor current feedback, L1For current transformer filter inductance inductance value, RdIt is equivalent
Passive damping resistance value is generally chosen for the capacitive reactance X of 0.4 times of capacitive branchC；CfFor filtering capacitance.
Wherein, digital filter cutoff frequency chooses the 1/3-1/2 of sample frequency, is selected as 1.5KHz herein.Sampling
When capacitance current, according to sampling thheorem, sample frequency need to be greater than twice of signal frequency, referred to as lack sampling when not being able to satisfy.This
When, the frequency content higher than sample frequency half will be reconstructed into the signal for being lower than sample frequency half, the overlapping of this frequency spectrum
Caused distortion is known as aliasing, and aliasing causes controller capacitance current fundamental wave sampled value substantially to reduce, and 5,7 subharmonic substantially increase
Add, the method for handling Aliasing Problem is filtered to capacitance current, by experimental contrast analysis, when filter cutoff frequency is
When 1.5kHz, filtered sample waveform aliasing is obviously improved.
(4) i is transformed to through dq againcd、icq；icd、icqThrough advancer, advancer uses first-order lead hysteresis loop
Section obtains offset voltage and gives Ucd, Ucq；
Wherein, L (s) is first-order lead compensation tache transmission function, and a is correction factor, TsFor time constant.
When designing lead compensation link parameter, it is necessary first to have suitable phase angular advance in resonant frequency range.Reason
By upper, leading angle is bigger, and the final lag angle of capacitance current is smaller, and effect is then better.But need to consider the item of differentiation element
Part, i.e. guarantee differentiation element are minimum in the amplitude-frequency gain of entire frequency band.Comprehensively consider the two conditions, differentiation element parameter selection
Range then becomes relative narrower.
The link leading angle is after compensating sampling, filtering lag angle, and the final lag angle of capacitance current is on 30 ° of left sides
The right side, therefore can be with Selecting All Parameters: T=5 × 10-5 (s), a=3.Sample frequency is 4.8kHz.Corresponding L (s) discrete domain frequency
Characteristic is as shown in Fig. 2, it is found that it is 25 °~29.4 ° that the differentiation element compensates angle in resonant frequency range, and high-frequency gain exists
Within 10dB, meet design requirement.
(5)Ud*、Uq* respectively with Ucd、UcqAlgebraic addition obtains contravarianter voltage and gives revised actual value Ud、Uq；
(6) voltage gives Ud、UqU is obtained through dq inverse transformationa、ub、uc, by SVPWM module, generate pwm pulse, control three
Each switching tube work of level.
The description of one step is done to control method of the present invention below in conjunction with specific examination example.
The present invention improves the energy accumulation current converter active damping resonance control method of adaptability, to existing active damping control
Method processed improves, and net-connected controller uses proportional integration PI control method, using Voltage loop, electric current loop two close cycles ring
Of ac is changed into DC quantity using vector and is adjusted by road；It is corresponding, in filter capacitor current feedback channel
Proportional component output, of ac is changed into DC quantity using vector, using lead compensation controller, is prolonged to because of sampling
When, digital control generation lag compensate control.Table 1 is the selected value of each variable of inverter.
Table 1
| Operating voltage | 380V |
| Energy accumulation current converter rated capacity | 250kW |
| Current transformer side filter reactance | 0.1mH |
| The single group filter capacitor of selection | 90μF |
| Grid side reactance | 0.05mH |
| The capacitor mode of connection | Delta connection |
| Virtual resistance resistance value in parallel | It is chosen for the capacitive reactance of 0.4 times of capacitive branch |
In test, LCL resonance frequency is adjusted by changing the method for filter capacitor parallel connection group number, has carried out resonance frequency
It is tested in the active damping of 680~1 220Hz ranges.Filter capacitor group number and its corresponding resonant frequency value are as shown in table 2.
Table 2
| Capacitance group number | Resonance frequency/Hz |
| 3 | 1220 |
| 4 | 1010 |
| 5 | 960 |
| 6 | 860 |
| 7 | 795 |
| 8 | 745 |
| 9 | 708 |
| 10 | 680 |
Steps are as follows for specific experiment:
(1) busbar voltage gives Udc*=750V, with actual bus voltage UdcDifference is obtained through PI pi controller
Inverter current gives i1*；
(2) three-phase reactor electric current i1I is transformed to through dq1d、i1q, i is given with inverter current1d*、i1q* (wherein, i1d*,
i1q* can be given by host computer, given P=250kW, Q=0KVar) difference through PI pi controller obtains contravarianter voltage
It is given to refer to Ud*、Uq*；
(3) current sensor acquires filter capacitor electric current ica、icb、icc, electric current ica、icb、iccIt is filtered by digital filter
After wave, after proportional component, i is transformed to through dqcd、icq；
(4)icd、icqThrough advancer, obtains offset voltage and give Ucd, Ucq；
(5)Ud*、Uq* respectively with Ucd、UcqAlgebraic addition obtains contravarianter voltage and gives revised actual value Ud、Uq；
(6) voltage gives Ud、UqU is obtained through dq inverse transformationa、ub、uc, by SVPWM module, generate pwm pulse, control three
Each switching tube work of level.
According to table 1, the proportional component coefficient that the capacitance current detected passes through is formula:
Lead compensation uses first-order lead delay component, transmission function are as follows:
By the scale parameter K for suitably increasing electric current loop PI controllerpSo that system is in critical diverging i.e. resonant state, throws
Enter virtual resistance control.
If Fig. 3 indicates that the resonance of 1220Hz has occurred in three machine shunt choppers, network voltage is influenced, networking current harmonics contains
Amount is very big, influences grid power quality, can also result in resonance diverging, inverter off-grid when serious.As Fig. 4 is indicated set by the investment
After the active damping of meter, electric current inhibits waveform at three machine parallel connection 1220Hz, and harmonic content substantially subtracts at networking anti-resonant frequency
It is small, system run all right, and do not bring low order aliasing components, i.e., the increase of 5 times and 7 subharmonic contents.
The method of the present invention is with good damping and there is resistance capacitance current to sample aliasing ability.Actual inverter
Be more parallel connections, and number of units real-time change in parallel, after more inverter parallels whole system exist from single machine resonance frequency to
The resonance problems of multimachine resonance frequency wide frequency ranges, the mentioned active damping method of the present invention can solve multi-inverter parallel scene
Resonance problems, effectively inhibition harmonic wave, substantially reduce harmonic content.
Claims (5)
1. a kind of energy accumulation current converter active damping resonance control method, which is characterized in that comprising steps of
(1) busbar voltage U is givendc* with actual bus voltage UdcDifference, obtain inverter current through PI pi controller
Given value i1*；
(2) three-phase reactor electric current i1I is transformed to through dq1d、i1q, respectively with the dq component i of inverter current given value1d*、i1q*
Difference show that contravarianter voltage gives reference value U through PI pi controllerd*、Uq*；
(3) current sensor acquires filter capacitor electric current ica、icb、icc, after digital filter, electric current ica, icb,
Icc passes through proportional component again；
(4) i is transformed to through dqcd、icq；icd、icq, through advancer, advancer uses first-order lead delay component, obtains
U is given to offset voltagecd, Ucq；
(5)Ud*、Uq* respectively with Ucd、UcqAlgebraic addition obtains contravarianter voltage and gives revised actual value Ud、Uq；
(6) voltage gives Ud、UqU is obtained through dq inverse transformationa、ub、uc, by SVPWM module, pwm pulse is generated, controls three level
Each switching tube work.
2. energy accumulation current converter active damping resonance control method according to claim 1, which is characterized in that the step 3
In proportional integration link are as follows:
Wherein, KpFor the proportional control factor of capacitor current feedback, L1For current transformer filter inductance inductance value, RdFor passive equivalence resistance
Buffer resistance value, CfFor filtering capacitance.
3. energy accumulation current converter active damping resonance control method according to claim 2, which is characterized in that passive equivalence resistance
Buffer resistance value is 0.4 times of capacitive branch capacitive reactance XC。
4. energy accumulation current converter active damping resonance control method according to claim 1, which is characterized in that the step 4
In, first-order lead compensation tache are as follows:
Wherein, L (s) is first-order lead compensation tache transmission function, and a is correction factor, TsFor time constant.
5. energy accumulation current converter active damping resonance control method according to claim 4, which is characterized in that lead compensation ring
Section parameter designing need to meet two conditions simultaneously: it is smaller that leading angle gets over the final lag angle of bulky capacitor electric current；Differentiation element exists
The amplitude-frequency gain of entire frequency band is minimum.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110994684A (en) * | 2019-12-23 | 2020-04-10 | 太原理工大学 | Control method of LCL type grid-connected converter under weak power grid |
| CN111061330A (en) * | 2019-12-30 | 2020-04-24 | 上海新时达电气股份有限公司 | Frequency converter bus voltage correction method and device, electronic equipment and storage medium |
| CN112152249A (en) * | 2020-09-10 | 2020-12-29 | 南方电网科学研究院有限责任公司 | Damping characteristic evaluation method, device and medium of conventional direct current secondary link |
| CN112701722A (en) * | 2020-12-21 | 2021-04-23 | 青岛鼎信通讯股份有限公司 | Active damping method for restraining grid-connected current dead zone harmonic of energy router |
| CN113036784A (en) * | 2021-05-08 | 2021-06-25 | 国网经济技术研究院有限公司 | Flexible-direct high-frequency oscillation control method and system based on hysteresis link |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110994684A (en) * | 2019-12-23 | 2020-04-10 | 太原理工大学 | Control method of LCL type grid-connected converter under weak power grid |
| CN110994684B (en) * | 2019-12-23 | 2022-06-24 | 太原理工大学 | Control method of LCL type grid-connected converter under weak power grid |
| CN111061330A (en) * | 2019-12-30 | 2020-04-24 | 上海新时达电气股份有限公司 | Frequency converter bus voltage correction method and device, electronic equipment and storage medium |
| CN111061330B (en) * | 2019-12-30 | 2021-07-23 | 上海新时达电气股份有限公司 | Frequency converter bus voltage correction method and device, electronic equipment and storage medium |
| CN112152249A (en) * | 2020-09-10 | 2020-12-29 | 南方电网科学研究院有限责任公司 | Damping characteristic evaluation method, device and medium of conventional direct current secondary link |
| CN112152249B (en) * | 2020-09-10 | 2022-03-08 | 南方电网科学研究院有限责任公司 | Damping characteristic evaluation method, device and medium of conventional direct current secondary link |
| CN112701722A (en) * | 2020-12-21 | 2021-04-23 | 青岛鼎信通讯股份有限公司 | Active damping method for restraining grid-connected current dead zone harmonic of energy router |
| CN113036784A (en) * | 2021-05-08 | 2021-06-25 | 国网经济技术研究院有限公司 | Flexible-direct high-frequency oscillation control method and system based on hysteresis link |
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Application publication date: 20191025 |