CN108270368B - A kind of single-phase inverter current predictive control method reducing harmonic wave - Google Patents
A kind of single-phase inverter current predictive control method reducing harmonic wave Download PDFInfo
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- CN108270368B CN108270368B CN201810159697.5A CN201810159697A CN108270368B CN 108270368 B CN108270368 B CN 108270368B CN 201810159697 A CN201810159697 A CN 201810159697A CN 108270368 B CN108270368 B CN 108270368B
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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
- H02M7/53—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 using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
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Abstract
The present invention provides a kind of single-phase inverter current predictive control methods for reducing harmonic wave, the first actual value of acquisition output electric current to predict output current value of the sampling instant next time in the state of difference according to actual value.Design iteration method calculates the average value of the output electric current of a continuous cycle under different predicted values, the value of fundamental wave instantaneous value and THD.To export the absolute value of the average value of electric current, the linear combination of the value of the absolute value of the difference and THD of fundamental wave instantaneous value and reference current value is majorized function, using traversal determination so that output of the smallest state of function as controller, realizes the single-phase inverter Model Predictive Control for the purpose of reducing harmonic wave.
Description
Technical field
The invention belongs to current transformer control technology fields, and in particular to a kind of single-phase inverter is electric for the purpose of reducing harmonic wave
Flow forecast Control Algorithm.
Background technique
Inverter cut-offs output alternating current by control switch element, realizes transformation of the electric energy from direct current to exchange.
In recent years, with the increase of the demands such as high-precision motor driving, new-energy grid-connected, inverter is needed to provide higher-quality exchange
Electric current.Total harmonic distortion (Total Harmonic Distortion, THD) is whether the quality of evaluation alternating current is up to standard
Main indicator.THD is lower, and the quality for illustrating alternating current is better.Excessively high THD can bring a series of counter productive, such as motor
Operational effect be deteriorated, the operating cost of power grid increases etc..More serious, excessively high THD is not added improvement or even will affect production
Safety, leads to property loss.
The advantages that predictive current control is easily achieved because of it, dynamic response is fast and strong robustness is in inverter control
It is widely used.Traditional predictive current control, the electric current that different switch combinations are obtained within a sampling period
It is predicted, prediction is obtained into electric current and is compared with reference current, the smallest switch combination of Select Error absolute value is achieved.
That is, traditional predictive current control is modulated using variance minimum as target.As " one kind is for single-phase for patent of invention
With regard to the defeated of useful next sampled point in the current predictive control method of gird-connected inverter " (patent No. ZL201510149477.0)
The predicted value of electric current and the error of reference current select switch combination out.But variance yields is small with the small non-equivalence of THD, namely
The small THD of variance yields is not necessarily small.Therefore, directly carry out implementation model PREDICTIVE CONTROL using THD minimum as target to be necessary.
Summary of the invention
The purpose of the present invention is providing a kind of single-phase inverter current predictive control method using THD minimum as target,
Existing PREDICTIVE CONTROL is reduced with the THD of the minimum mesh calibration method of variance, improves the quality of inverter output AC electric current.
In order to solve the above technical problems, the present invention provides a kind of single-phase inverter current forecasting controls for reducing harmonic wave
Method processed, inverter are connected by resistance and the concatenated filter of inductance with inverse electromotive force；Wherein, resistance value is R, inductance value
It is L, inverse electromotive force is Ug；
The voltage of inverter DC terminal is denoted as Vdc, the fundamental frequency of power grid is f0=50Hz, synchronous rotational speed are defined as ω0=
2×πf0Rad/s, sample frequency fs, sampling time Ts, the sampling number of a cycle is N, then has Ts=1/fs, N=fs/
50；
The output electric current of single-phase inverter is i, and the reference value of the output electric current of single-phase inverter is i*, it is the fundamental wave of standard
Sinusoidal signal；There are three types of states for inverter output current, export as VdcIt is denoted as state S1, export and be denoted as state S for 02, output
For-VdcIt is denoted as state S3；λ1And λ2For the constant greater than 0, for DC component and total harmonic distortion to be arranged in control input
Weight；
The control method includes the following steps:
1) predicted value is calculated, in kth time sampling, acquisition output electric current i (k), computing system is in next sampling
When carving k+1, under different output states, the predicted value of electric current is exportedCalculation method is as follows:
2) iterative calculation is in kth time sampling, the virtual value I of the output electric current of a continuous cycleRMS(k), continuous one
The average value I of a cycle output electric current0(k), the fundamental voltage amplitude I of continuous cycle output electric current1(k) and fundametal compoment
Instantaneous value iα(k)；Calculation method is as follows:
I0(k)=I0(k-1)+[i(k)-i(k-N)]
iα(k)=(1- ω0Ts)iα(k-1)+ω0Ts[i(k)-iβ(k-1)]
iβ(k)=iβ(k-1)+ω0Tsiα(k-1)
Wherein iβ(k), I1sin(k) and I1cosIt (k) is auxiliary calculation amount；
Third step, when calculating the predicted value of different output electric currents, the virtual value of the output electric current of a continuous cycle is flat
Mean valueThe output current average of a continuous cycleContinuous one
A cycle exports fundamental voltage amplitudeWith a continuous cycleCalculating side
Method is as follows:
4) three scalar function J (k) are calculated | S1, J (k) | S2With J (k) | S3, calculation method is as follows:
5) compare J (k) | S1, J (k) | S2With J (k) | S3Size, select minimum value J (k) | Sm, m ∈ { 1,2,3 }；If m
=1, then the inverter output at k moment is state S1；If the inverter output at m=2, k moment is state S2；If all non-above,
Just select state S3Output as inverter.
Compared to the prior art, technical solution of the present invention have it is following the utility model has the advantages that
A kind of single-phase inverter current predictive control method reducing harmonic wave provided by the invention, using THD minimum as mesh
Target single-phase inverter current predictive control method, reduces existing PREDICTIVE CONTROL with the THD of the minimum mesh calibration method of variance,
Improve the quality of inverter output AC electric current.
Detailed description of the invention
Fig. 1 is the circuit topology figure of single-phase inverter；
It is 1A, λ that Fig. 2, which is exporting the maximum value of current reference value,1=0.03, λ2When=2.6, inverter output current
Tracing figure；
It is 1A, λ that Fig. 3, which is exporting the maximum value of current reference value,1=0.03, λ2When=2.6, the frequency analysis of inverter
Figure；
It is 4A, λ that Fig. 4, which is exporting the maximum value of current reference value,1=0.1, λ2When=32, inverter output current with
Track figure；
It is 4A, λ that Fig. 5, which is exporting the maximum value of current reference value,1=0.1, λ2When=32, the frequency analysis figure of inverter.
Specific embodiment
With reference to the accompanying drawings and examples, the present invention is described in further detail.
With reference to Fig. 1, single-phase inverter is connected by resistance R and the concatenated filter of inductance L with inverse electromotive force Ug；
The voltage of single-phase inverter DC terminal is denoted as Vdc, the fundamental frequency of power grid is f0=50Hz, synchronous rotational speed are defined as
ω0=2 × π f0Rad/s, sample frequency fs, sampling time Ts, the sampling number of a cycle is N, then has Ts=1/fs, N
=fs/50；
The output electric current of single-phase inverter is i, and the reference value of the output electric current of single-phase inverter is i*, it is the fundamental wave of standard
Sinusoidal signal；Single-phase inverter exports electric current, and there are three types of states: when electrical power switching element S1 and S4 are connected, and S2 and S3 are turned off,
It is V that single-phase inverter, which exports Current Voltage,dc, it is denoted as state S at this time1；When electrical power switching element S1 and S3 are connected, S2 and S4 are turned off
When, it is 0 that single-phase inverter, which exports Current Voltage, is denoted as state S at this time2；When electrical power switching element S1 and S4 are turned off, S2 and S3 are led
When logical, it is-V that single-phase inverter, which exports Current Voltage,dc, it is denoted as state S at this time3；λ1And λ2It is straight for being arranged for the constant greater than 0
Flow component and THD determine the weight in control input；
A kind of single-phase inverter current predictive control method reducing harmonic wave, the control method include the following steps:
1) predicted value is calculated, in kth time sampling, acquisition output electric current i (k), computing system is in next sampling
When carving k+1, under different output states, the predicted value of electric current is exportedCalculation method is as follows:
2) iterative calculation is in kth time sampling, the virtual value I of the output electric current of a continuous cycleRMS(k), continuous one
The average value I of a cycle output electric current0(k), the fundamental voltage amplitude I of continuous cycle output electric current1(k) and fundametal compoment
Instantaneous value iα(k)；Calculation method is as follows:
I0(k)=I0(k-1)+[i(k)-i(k-N)]
iα(k)=(1- ω0Ts)iα(k-1)+ω0Ts[i(k)-iβ(k-1)]
iβ(k)=iβ(k-1)+ω0Tsiα(k-1)
Wherein iβ(k), I1sin(k) and I1cosIt (k) is auxiliary calculation amount；Illustrate, as k≤N, the above calculating has part
Value missing.At this point it is possible to using reference value i*The value being not present is replaced to be calculated in the value at corresponding moment.
Third step, when calculating the predicted value of different output electric currents, the virtual value of the output electric current of a continuous cycle is flat
Mean valueThe output current average of a continuous cycleContinuous one
A cycle exports fundamental voltage amplitudeWith a continuous cycleCalculating side
Method is as follows:
4) three scalar function J (k) are calculated | S1, J (k) | S2With J (k) | S3, calculation method is as follows:
5) compare J (k) | S1, J (k) | S2With J (k) | S3Size, select minimum value J (k) | Sm, m ∈ { 1,2,3 }；If m
=1, then the inverter output at k moment is state S1；If the inverter output at m=2, k moment is state S2；If all non-above,
Just select state S3Output as inverter.
A kind of single-phase inverter current predictive control method reducing harmonic wave provided by the invention, using THD minimum as mesh
Target single-phase inverter current predictive control method, reduces existing PREDICTIVE CONTROL with the THD of the minimum mesh calibration method of variance,
Improve the quality of inverter output AC electric current.
In order to verify above-mentioned control method, the present embodiment is verified using following parameter:
It is 1A, λ that Fig. 2, which is represented in the maximum value for exporting current reference value,1=0.03, λ2When=2.6, using above-mentioned control
After method processed is controlled, the tracing figure of inverter output current；Fig. 3 is represented is in the maximum value for exporting current reference value
1A、λ1=0.03, λ2When=2.6, after being controlled using above-mentioned control method, the frequency analysis figure of inverter.With tradition with
The PREDICTIVE CONTROL of the minimum target of variance compares, and using the method proposed, the THD value for exporting electric current is reduced from 14.60%
To 13.71%.
It is 4A, λ that Fig. 4, which is represented in the maximum value for exporting current reference value,1=0.1, λ2When=32, using above-mentioned control
After method is controlled, the tracing figure of inverter output current；Fig. 5 represent output current reference value maximum value be 4A,
λ1=0.1, λ2When=32, after being controlled using above-mentioned control method, with tradition with the PREDICTIVE CONTROL of the minimum target of variance
It compares, the THD value for exporting electric current is reduced to 4.88% from 4.98%.
The above embodiment of the present invention be only to clearly illustrate example of the present invention, and not be to the present invention
Embodiment restriction.All any modifications, equivalent replacements, and improvements made within conception and technical scheme of the invention
Deng should all be included in the scope of protection of the claims of the present invention.
Claims (1)
1. a kind of single-phase inverter current predictive control method for reducing harmonic wave, it is characterised in that: inverter passes through resistance and electricity
Feel concatenated filter to be connected with inverse electromotive force；Wherein, resistance value is R, and inductance value is L, and inverse electromotive force is Ug；
The voltage of inverter DC terminal is denoted as Vdc, the fundamental frequency of power grid is f0=50Hz, synchronous rotational speed are defined as ω0=2 × π
f0Rad/s, sample frequency fs, sampling time Ts, the sampling number of a cycle is N, then has Ts=1/fs, N=fs/50；
The output electric current of single-phase inverter is i, and the reference value of the output electric current of single-phase inverter is i*, is that the fundamental wave of standard is sinusoidal
Signal；There are three types of states for inverter output current, export as VdcIt is denoted as state S1, export and be denoted as state S for 02, export as-Vdc
It is denoted as state S3；λ1And λ2For the constant greater than 0, the weight in input is being controlled for DC component and total harmonic distortion to be arranged；
The control method includes the following steps:
1) predicted value is calculated, in kth time sampling, acquisition output electric current i (k), computing system is in next sampling instant k+1
When, under different output states, export the predicted value of electric currentCalculation method is as follows:
2) iterative calculation is in kth time sampling, the virtual value I of the output electric current of a continuous cycleRMS(k), a continuous week
The average value I of wave output electric current0(k), the fundamental voltage amplitude I of continuous cycle output electric current1(k) and fundametal compoment it is instantaneous
Value iα(k)；Calculation method is as follows:
I0(k)=I0(k-1)+[i(k)-i(k-N)]
iα(k)=(1- ω0Ts)iα(k-1)+ω0Ts[i(k)-iβ(k-1)]
iβ(k)=iβ(k-1)+ω0Tsiα(k-1)
Wherein iβ(k), I1sin(k) and I1cosIt (k) is auxiliary calculation amount；
Third step, when calculating the predicted value of different output electric currents, the virtual value average value of the output electric current of a continuous cycleThe output current average of a continuous cycleA continuous week
Wave exports fundamental voltage amplitudeWith a continuous cycleCalculation method
It is as follows:
4) three scalar function J (k) are calculated | S1, J (k) | S2With J (k) | S3, calculation method is as follows:
5) compare J (k) | S1, J (k) | S2With J (k) | S3Size, select minimum value J (k) | Sm, m ∈ { 1,2,3 }；If m=1,
The inverter output at k moment is state S1；If the inverter output at m=2, k moment is state S2；If all non-above, just select
State S3Output as inverter.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101938223A (en) * | 2010-09-17 | 2011-01-05 | 华中科技大学 | Multidimensional digital controlled inverter power supply |
| CN102237691A (en) * | 2011-07-06 | 2011-11-09 | 东北大学 | Wind energy and solar energy grid-connected generation system and control method thereof |
| CN104135181A (en) * | 2014-06-12 | 2014-11-05 | 上海紫竹新兴产业技术研究院 | Model predictive control method based on grid-connection inversion of photovoltaic system |
| CN106059361A (en) * | 2016-06-16 | 2016-10-26 | 苏州大学 | Fixed-frequency model predict control method and device of inverter |
| CN107171587A (en) * | 2017-06-09 | 2017-09-15 | 南京航空航天大学 | A kind of modified finite aggregate model predictive control method suitable for inverter |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101938223A (en) * | 2010-09-17 | 2011-01-05 | 华中科技大学 | Multidimensional digital controlled inverter power supply |
| CN102237691A (en) * | 2011-07-06 | 2011-11-09 | 东北大学 | Wind energy and solar energy grid-connected generation system and control method thereof |
| CN104135181A (en) * | 2014-06-12 | 2014-11-05 | 上海紫竹新兴产业技术研究院 | Model predictive control method based on grid-connection inversion of photovoltaic system |
| CN106059361A (en) * | 2016-06-16 | 2016-10-26 | 苏州大学 | Fixed-frequency model predict control method and device of inverter |
| CN107171587A (en) * | 2017-06-09 | 2017-09-15 | 南京航空航天大学 | A kind of modified finite aggregate model predictive control method suitable for inverter |
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