CN106208060B - A kind of control method based on tandem type PCU Power Conditioning Unit compensation harmonic - Google Patents
A kind of control method based on tandem type PCU Power Conditioning Unit compensation harmonic Download PDFInfo
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- CN106208060B CN106208060B CN201610643776.4A CN201610643776A CN106208060B CN 106208060 B CN106208060 B CN 106208060B CN 201610643776 A CN201610643776 A CN 201610643776A CN 106208060 B CN106208060 B CN 106208060B
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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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- 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
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Abstract
A kind of control method based on tandem type PCU Power Conditioning Unit compensation harmonic provided by the invention, both the harmonic wave of load branch in electric system can have been compensated, the harmonic wave that tandem type PCU Power Conditioning Unit itself exports can also be compensated, and it can be according to actual condition, harmonic wave is automatically compensated in real time, substantially improves grid power quality.
Description
Technical field
The invention belongs to the control technology fields of power electronic equipment, in particular to a kind of to be filled based on tandem type power regulation
Set the control method of compensation harmonic.
Background technique
Tandem type PCU Power Conditioning Unit has obtained in high-power, mesohigh drive system since its structure is simple, modularization
To extensive use.In recent years, as the grid connection capacity of the renewable energy systems such as solar energy, wind-power electricity generation increasingly increases,
It needs to be able to carry out the power electronic equipment that active and reactive power is adjusted in the installation of the grid-connected place of these systems to solve it
Grid-connected bring power quality problem.Therefore, tandem type PCU Power Conditioning Unit is applied to high pressure, high-capacity power regulating system
Research it is also increasingly extensive.
In ideal clean power supply system, electric current and voltage are all sine waves.Containing only linear element (resistance, electricity
Sense and capacitor) ball bearing made in, the electric current flowed through is directly proportional to the voltage of application, and the electric current flowed through is sine wave.Harmonic wave produces
Raw basic reason be due to caused by nonlinear load, it is not in a linear relationship with added voltage when electric current flows through load, just
Non-sinusoidal current is formed, to generate harmonic wave.Harmonic pollution be to the harm of electric system it is serious, take corresponding measure to be subject to
Inhibit to reduce its harm, here it is harmonics restraints.
For the harmonic pollution problems for solving power electronic equipment and other harmonic sources, it is dress that basic ideas, which have two: one,
If harmonic compensation device carrys out compensation harmonic, this is all applicable to various harmonic sources；Another is to power electronic equipment itself
It is transformed, so that the phase is not generated harmonic wave, and power factor is controllable to 1, this is only applicable to the electricity as major harmonic source certainly
Power electronic device.
Current this field cannot all accomplish to compensate simultaneously about the control method of tandem type PCU Power Conditioning Unit compensation harmonic
The harmonic wave that the harmonic wave of load branch and connection formula PCU Power Conditioning Unit itself export in electric system.
Summary of the invention
And a kind of control method based on tandem type PCU Power Conditioning Unit compensation harmonic provided by the invention, it can both compensate
The harmonic wave of load branch in electric system can also compensate the harmonic wave that tandem type PCU Power Conditioning Unit itself exports, and can root
According to actual condition, harmonic wave is automatically compensated in real time, substantially improves grid power quality.
In order to solve the above technical problems, technical solution of the present invention is as follows: one kind is compensated based on tandem type PCU Power Conditioning Unit
The control method of harmonic wave, it is characterised in that:
A) by voltage sensor, sampling obtains three-phase power grid voltage, is denoted as: Uga、Ugb、Ugc；
B) three-phase power grid voltage obtained according to above-mentioned sampling obtains the phase of network voltage by digital phase-locked loop, note
For Gridtheta；
C) the three-phase nth harmonic offset voltage of setting injection tandem type PCU Power Conditioning Unit expresses formula are as follows:
Wherein: harmonica_n, harmonicb_n and harmonicc_n are respectively inject tandem type PCU Power Conditioning Unit three
Phase nth harmonic offset voltage；UnFor the compensation amplitude of nth harmonic compensation, initialization A0；Comtheta_n is nth harmonic benefit
Repay angle, initialization θ0；N is the overtone order for injecting tandem type PCU Power Conditioning Unit, in three-phase grid device, harmonic wave
Frequency n=6k ± 1, k=1,2,3 ..., and when n=6k-1 time-harmonic wave voltage is negative phase-sequence, when n=6k+1 time-harmonic wave voltage is positive
Sequence；
D) by the nth harmonic electric current content in stress_responsive genes Instrument observation harmonic compensation branch, n times in c) step are kept
Harmonic amplitude A0It is constant, nth harmonic offset angle comtheta_n is adjusted in real time, searches out optimal nth harmonic offset angle,
And keep this angle constant in the next steps；
E) current value of tandem type PCU Power Conditioning Unit nth harmonic voltage magnitude is denoted as Um；Set nth harmonic compensation
Amplitude variable quantity is Δ Vn；A timer is set as t；A degree variables are set as Timeflag, initial value i；Set n times
The minimum requirements of harmonic content after harmonic compensation is Iref_n；
F) by current sensor, sampling obtains the three-phase current of harmonic compensation branch, is denoted as: ILa、ILb、ILc；
G) three-phase current of harmonic compensation branch is obtained according to above-mentioned sampling, using based on Instantaneous Power Theory harmonic detecting
Method calculates the instantaneous value of three-phase nth harmonic electric current, is denoted as: ILa_n、ILb_n、ILc_n；
It h) is the root-mean-square valve theory of instantaneous value, meter using virtual value according to the instantaneous value of above-mentioned three-phase nth harmonic electric current
The virtual value for calculating three-phase nth harmonic electric current, is denoted as: ILaRMS_n、ILbRMS_n、ILcRMS_n；
I) according to the virtual value of above-mentioned three-phase nth harmonic electric current, formula is utilized
Obtain the average value of nth harmonic electric current；
J) stagnant ring disturbs comparison method: when timer t first time timing arrives, degree variables become Timeflag=i+1,
The nth harmonic current average being calculated at this time is denoted as Iav_n1, the nth harmonic voltage magnitude of output is set as Um+ΔVn；
When second of timing of timer t arrives, degree variables become Timeflag=i+2, the nth harmonic electricity being calculated at this time
Levelling mean value is denoted as Iav_n2, the nth harmonic voltage magnitude of output is set as Um-ΔVn；When timer t third time timing
It arrives, degree variables become Timeflag=i+3, and the nth harmonic current average being calculated at this time is denoted as Iav_n3, and secondary
Number variable becomes Timeflag=i；
K) more above-mentioned nth harmonic current average Iav_n1、Iav_n2、Iav_n3If Iav_n2≤Iav_n1≤Iav_n3, then cascade
The nth harmonic voltage magnitude of formula PCU Power Conditioning Unit output is Um+ΔVn；If Iav_n3<Iav_n1<Iav_n2, then tandem type power tune
The nth harmonic voltage magnitude of regulating device output is Um-ΔVn；If other situations, then tandem type PCU Power Conditioning Unit output n
Subharmonic voltage amplitude remains unchanged, and is still Um.Modulation voltage amplitude at this time is denoted as Um, and it is set as timer t next time
The initial value for the nth harmonic voltage magnitude that timing exports after；
If l) detecting the average value I of nth harmonic electric currentav_n>Iref_n, execute step j) and k)；Otherwise, it keeps working as prime
The nth harmonic voltage magnitude of connection formula PCU Power Conditioning Unit output is constant.
Compared with the prior art, the invention has the advantages that:
1) harmonic content that can both compensate load branch in electric system by means of the present invention, samples power grid at this time
Electric current can also compensate each harmonic that tandem type PCU Power Conditioning Unit itself exports, and sample cascade unit at this time and export electric current.
2) calculated each harmonic compensation component is to be directly superimposed to tandem type power regulation by means of the present invention
It on the modulation voltage of device output, is exported after being adjusted not as instruction by pi regulator, static error, compensation effect is not present
Fruit is obvious.
3) it can dynamically adjust in real time by means of the present invention and carry out compensation harmonic, as long as compensation branch harmonic wave is unsatisfactory for most
Low requirement or place branch harmonic content change in real time because operating condition is different can be by this method real-time automatic compensation.
Detailed description of the invention
Fig. 1 is the circuit structure diagram of tandem type PCU Power Conditioning Unit of the invention.
Fig. 2 is the control flow chart of harmonic compensation angle calculation in the present invention.
Fig. 3 is the control flow chart that harmonic compensation amplitude calculates in the present invention.
Fig. 4 is device output current wave and harmonic content before cascade formula PCU Power Conditioning Unit harmonic compensation of the present invention.
Fig. 5 is device output current wave and harmonic content after cascade formula PCU Power Conditioning Unit harmonic compensation of the present invention.
Specific embodiment
Below in conjunction with attached drawing to one kind of the invention be based on tandem type PCU Power Conditioning Unit in harmonic compensation control method into
The description of one step.
As shown in Figure 1, circuit structure diagram of the invention provides a kind of PCU Power Conditioning Unit for high-voltage electric power system,
It realizes that high pressure is grid-connected by the way of cascading multiple single-phase full bridge inversion units, utilizes the big electricity on each unit DC bus
The active power of reactive power and transient change is adjusted in appearance, the function collection that active power regulation and reactive power are adjusted
, there is stronger dynamic regulation ability.
The regulation method that the present invention uses is the increase harmonic compensation function on the basis of conventional software approach, and
And in each project sites, because the operating condition of device is different, start harmonic compensation module for the first time, it is necessary to first
Respective harmonic compensation angle is determined with the mode of online observation, and the benefit of each harmonic component is then calculated with stagnant ring disturbance comparison method
Repay amplitude；
When the harmonic current exported with method compensation tandem type PCU Power Conditioning Unit ontology of the invention, we are typically chosen
Starting harmonic compensation function cannot be started in zero load after tandem type PCU Power Conditioning Unit has sent out certain reactive power
This module, because of the device output fundamental current very little detected at this time, the ratio of harmonic content is bigger, to harmonic component
Detection inaccuracy.
Tandem type PCU Power Conditioning Unit works in harmonic compensation mode, we use software timing 2s, i.e., injects each time
Regulating time after harmonic wave is 2s, on the one hand, ensures that the harmonic wave compensated remains unchanged within this time；On the other hand, this hair
Bright control method is the virtual value with each harmonic, and the calculating of virtual value needs a cycle, within the 2s time, Wo Menke
Multiple periods are calculated with sampling, it is ensured that sampling circuit detects that each harmonic is accurate and stablizes, convenient for the ratio of each harmonic content
Compared with.
As shown in Figure 2 and Figure 3, the present invention provides a kind of harmonic compensation controlling parties based on tandem type PCU Power Conditioning Unit
Method, the control method include following steps, below by taking the compensation of 5 subharmonic as an example:
A) by voltage sensor, power grid three-phase voltage is obtained, is denoted as: Uga、Ugb、Ugc；
B) according to above-mentioned sampled voltage, the phase of network voltage is obtained by digital phase-locked loop, is denoted as Gridtheta；
C) 5 subharmonic offset voltage formula of setting injection tandem type PCU Power Conditioning Unit are as follows:
Wherein: harmonica_5, harmonicb_5 and harmonicc_5 are respectively inject tandem type PCU Power Conditioning Unit 5
Subharmonic compensates three-phase voltage；U5For the compensation amplitude of 5 subharmonic compensation, initialization A0；Comtheta_5 is 5 subharmonic
Offset angle, initialization θ0；
D) it by 5 subharmonic contents in stress_responsive genes Instrument observation harmonic compensation branch current, keeps in c) step 5 times
Harmonic amplitude A0It is constant, 5 subharmonic offset angles are adjusted, search out optimal 5 subharmonic offset angle, and protect in the next steps
It is constant to hold this angle；
E) current value of 5 subharmonic voltage amplitude of tandem type PCU Power Conditioning Unit is denoted as Um；Set the compensation of 5 subharmonic
Amplitude variable quantity is Δ V5；A timer is set as t；Defining a degree variables is Timeflag, initial value i；Setting 5 times
The minimum requirements of harmonic content after harmonic compensation is Iref_5；
F) by current sensor, the three-phase current of harmonic compensation branch is obtained, is denoted as: ILa、ILb、ILc；
G) 5 subharmonic contents are calculated using Instantaneous Power Theory harmonic detecting method is based on according to above-mentioned sample rate current
Three-phase instantaneous value, be denoted as: ILa_5、ILb_5、ILc_5；
It h) is the root-mean-square valve theory of instantaneous value, meter using virtual value according to 5 subharmonic current instantaneous value obtained above
The three-phase virtual value for calculating 5 subharmonic currents, is denoted as: ILaRMS_5、ILbRMS_5、ILcRMS_5；
I) according to the virtual value of above-mentioned three phase harmonic electric current, formula is utilized
Obtain the average value of 5 subharmonic currents；
J) stagnant ring disturbs comparison method: when timer t first time timing arrives, degree variables Timeflag=i+1,
5 subharmonic currents of detection back are denoted as Iav_51, 5 subharmonic voltage amplitudes of output are set as Um+ΔV5；As timer t second
Secondary timing arrives, and degree variables become Timeflag=i+2, and 5 subharmonic currents detected at this time back are denoted as Iav_52, setting
Exporting 5 subharmonic voltage amplitudes is Um-ΔV5；When timer t third time timing arrives, degree variables become Timeflag=i
+ 3, the harmonic current detected at this time back is denoted as Iav_53, and degree variables are become Timeflag=i；
K) compare Iav_51、Iav_52、Iav_53If Iav_52≤Iav_51≤Iav_53, then tandem type PCU Power Conditioning Unit output 5
Subharmonic voltage amplitude becomes Um+ΔV5；If Iav_53<Iav_51<Iav_52, then tandem type PCU Power Conditioning Unit output 5 subharmonic
Voltage magnitude becomes Um-ΔV5；If other situations, then 5 subharmonic voltage amplitudes of tandem type PCU Power Conditioning Unit output are kept
It is constant, it is still Um；Modulation voltage amplitude at this time is denoted as Um, i.e., timer t timing exports modulation voltage after next time
Initial value；
If l) detecting 5 subharmonic content Iav_5>Iref_5, continue to execute step j) and k)；Otherwise, current cascade is kept
The modulation voltage amplitude of formula PCU Power Conditioning Unit output is constant；
It is one embodiment of the method for the present invention below:
Illustrate one kind of the invention for harmonic compensation control in tandem type PCU Power Conditioning Unit with specific embodiment below
Method, by taking circuit structure shown in FIG. 1 as an example, the parameters of power grid and the present apparatus are as shown in the table:
This example test condition: what harmonic wave sampling circuit detected is the grid-connected electricity of tandem type PCU Power Conditioning Unit ontology output
Stream starts harmonic compensation function when the reactive power of device is in 2Mvar, mainly compensates to 5 times and 7 subharmonic, real
It is as shown in Figure 4 and Figure 5 to test waveform, from experimental waveform as can be seen that plus after harmonic compensation function, tandem type PCU Power Conditioning Unit sheet
The grid-connected current harmonic content of body output is reduced to 3.5% from 9.0%, and harmonic compensation effect is obvious.
Description for the understanding of specific embodiment be only be to help to understand the present invention, rather than be used to limit this hair
Bright.Those skilled in the art can use thought of the invention and carry out some modifications and changes, as long as its technological means does not have
Have and be detached from thought and main points of the invention, still within protection scope of the present invention.
Claims (1)
1. a kind of control method based on tandem type PCU Power Conditioning Unit compensation harmonic, it is characterised in that:
A) by voltage sensor, sampling obtains three-phase power grid voltage, is denoted as: Uga、Ugb、Ugc；
B) three-phase power grid voltage obtained according to above-mentioned sampling obtains the phase of network voltage by digital phase-locked loop, is denoted as
Gridtheta；
C) the three-phase nth harmonic offset voltage of setting injection tandem type PCU Power Conditioning Unit expresses formula are as follows:
Wherein: harmonica_n, harmonicb_n and harmonicc_n are respectively inject tandem type PCU Power Conditioning Unit three
Phase nth harmonic offset voltage；UnFor the compensation amplitude of nth harmonic compensation, initialization A0；Comtheta_n is nth harmonic benefit
Repay angle, initialization θ0；N is the overtone order for injecting tandem type PCU Power Conditioning Unit, in three-phase grid device, harmonic wave
Frequency n=6k ± 1, k=1,2,3 ..., and when n=6k-1 time-harmonic wave voltage is negative phase-sequence, when n=6k+1 time-harmonic wave voltage is positive
Sequence；
D) by the nth harmonic electric current content in stress_responsive genes Instrument observation harmonic compensation branch, nth harmonic in c) step is kept
Amplitude A0It is constant, nth harmonic offset angle comtheta_n is adjusted in real time, searches out optimal nth harmonic offset angle, and
Keep this angle constant in subsequent step；
E) current value of tandem type PCU Power Conditioning Unit nth harmonic voltage magnitude is denoted as Um；Set the amplitude of nth harmonic compensation
Variable quantity is △ Vn；A timer is set as t；A degree variables are set as Timeflag, initial value i；Set nth harmonic
The minimum requirements of compensated harmonic content is Iref_n；
F) by current sensor, sampling obtains the three-phase current of harmonic compensation branch, is denoted as: ILa、ILb、ILc；
G) three-phase current of harmonic compensation branch is obtained according to above-mentioned sampling, using based on Instantaneous Power Theory harmonic detecting side
Method calculates the instantaneous value of three-phase nth harmonic electric current, is denoted as: ILa_n、ILb_n、ILc_n；
H) according to the instantaneous value of above-mentioned three-phase nth harmonic electric current, it is the root-mean-square valve theory of instantaneous value using virtual value, calculates
The virtual value of three-phase nth harmonic electric current, is denoted as: ILaRMS_n、ILbRMS_n、ILcRMS_n；
I) according to the virtual value of above-mentioned three-phase nth harmonic electric current, formula is utilized?
To the average value of nth harmonic electric current；
J) stagnant ring disturbs comparison method: when timer t first time timing arrives, degree variables become Timeflag=i+1, this
When the nth harmonic current average that is calculated be denoted as Iav_n1, the nth harmonic voltage magnitude of output is set as Um+△Vn；When fixed
When device second of timing of t arrive, degree variables become Timeflag=i+2, and the nth harmonic electric current being calculated at this time is put down
Mean value is denoted as Iav_n2, the nth harmonic voltage magnitude of output is set as Um-△Vn；It is secondary when timer t third time timing arrives
Number variable becomes Timeflag=i+3, and the nth harmonic current average being calculated at this time is denoted as Iav_n3, and number is become
Quantitative change is Timeflag=i；
K) more above-mentioned nth harmonic current average Iav_n1、Iav_n2、Iav_n3If Iav_n2≤Iav_n1≤Iav_n3, then tandem type function
The nth harmonic voltage magnitude of rate regulating device output is Um+△Vn；If Iav_n3<Iav_n1<Iav_n2, then tandem type power regulation fills
The nth harmonic voltage magnitude for setting output is Um-△Vn；If other situations, then the n times of tandem type PCU Power Conditioning Unit output are humorous
WAVE VOLTAGE AMPLITUDE VALUES remains unchanged, and is still Um.Modulation voltage amplitude at this time is denoted as Um, and it is set as timer t timing next time
The initial value for the nth harmonic voltage magnitude that time exports after；
If l) detecting the average value I of nth harmonic electric currentav_n>Iref_n, execute step j) and k)；Otherwise, current tandem type is kept
The nth harmonic voltage magnitude of PCU Power Conditioning Unit output is constant.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130051105A1 (en) * | 2011-08-22 | 2013-02-28 | Delta Electronics (Shanghai) Co., Ltd. | Power compensation apparatus and method for renewable energy system |
| CN104167738A (en) * | 2014-07-09 | 2014-11-26 | 中国神华能源股份有限公司 | Electric energy quality treatment and energy storage integrated energy saving device and control method |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130051105A1 (en) * | 2011-08-22 | 2013-02-28 | Delta Electronics (Shanghai) Co., Ltd. | Power compensation apparatus and method for renewable energy system |
| CN104167738A (en) * | 2014-07-09 | 2014-11-26 | 中国神华能源股份有限公司 | Electric energy quality treatment and energy storage integrated energy saving device and control method |
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