CN108631638A - A kind of improved model forecast Control Algorithm of single-phase inverter - Google Patents
A kind of improved model forecast Control Algorithm of single-phase inverter Download PDFInfo
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- CN108631638A CN108631638A CN201810481821.XA CN201810481821A CN108631638A CN 108631638 A CN108631638 A CN 108631638A CN 201810481821 A CN201810481821 A CN 201810481821A CN 108631638 A CN108631638 A CN 108631638A
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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
- H02M7/539—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 with automatic control of output wave form or frequency
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Abstract
The present invention relates to a kind of improved model forecast Control Algorithms of single-phase inverter, and the output of single-phase inverter is controlled by the way that multiple control moment are arranged within the sampling period；In each sampling period, output current is sampled first to obtain actual current value, using actual current value as feedback quantity carry out Model Predictive Control obtain single-phase inverter the control moment output；Second in the sampling period controls the moment, using the predicted current value at current time as the feedback quantity of electric current, the feedback quantity of predicted current value as electric current currently to control the moment carries out Model Predictive Control and obtains the output that single-phase inverter controls the moment at second, and so on, until next sampling period.The present invention realizes primary sampling repeatedly control, reduces hardware requirement of the control system to sampling unit, the complexity of sample circuit is reduced from demand and reduces the cost of hardware under the premise of ensuring output current control effect.
Description
Technical field
The present invention relates to single-phase inverter control fields, and in particular to a kind of improved model PREDICTIVE CONTROL of single-phase inverter
Method.
Background technology
Single-phase inverter is widely used in the new energy fields such as grid-connected, direct-current grid and electric vehicle.It adopts
It is the transformation for realizing electric energy from direct current to exchange with the purpose of single-phase inverter.Thereby it is ensured that output current is for sinusoidal waveform
The main target of single-phase inverter control.Model Predictive Control is a kind of Discrete Control Method.It is inverse under different on off states
The voltage status for becoming device output is different.In each sampling instant, under different optional input voltage states, prediction is next
The output current value of sampling instant is selected with the on off state corresponding to the predicted current value of reference current difference minimum as control
The output of device processed realizes the Model Predictive Control of inverter.Its advantage is that logic is simple, strong robustness.But it is traditional
Model Predictive Control one secondary control of sampling is primary, in order to reach preferable output current control effect, controlling of sampling set of frequency
In higher level, the higher voltage and current Acquisition Circuit of sample rate is needed, causes hardware to complicate and increases cost.Therefore,
How in the case where ensureing control effect sampling efficiency is reduced, reduce the support type of sample circuit to reduce cost, is single
One of phase inverter Model Predictive Control problem encountered.
Invention content
The purpose of the present invention is to provide a kind of improved model forecast Control Algorithms of single-phase inverter, are ensureing preferably
Control effect on the basis of, sample rate is reduced, to achieve the purpose that reduce sample circuit complexity, reduce cost.
To achieve the above object, the technical solution adopted is that：
A kind of improved model forecast Control Algorithm of single-phase inverter, by the way that multiple controls are arranged within a sampling period
Moment processed controls the output of single-phase inverter；In each sampling period, output current is sampled first to obtain reality
Current value predicts output current of next control moment under different voltage status using actual current value as feedback quantity
Value obtains the predicted current value at next control moment；Then it by being traversed to next control moment predicted current value, determines
With the immediate voltage status of reference current as single-phase inverter the control moment output；
The moment is controlled at second of the sampling period, using the predicted current value at current time as the feedback quantity of electric current,
It predicts output current value of next control moment under different voltage status, obtains the predicted current at next control moment
Value；Then it is traversed, is determined and the immediate voltage shape of reference current by the predicted current value to next control moment
State controls the output at moment as single-phase inverter at second, and so on, until next sampling period.
Each of described single-phase inverter controls the moment when carrying out Model Predictive Control, specifically executes following steps：
Step 1, the feedback quantity for determining the current control moment；
The current control moment is denoted as k-th and controls the moment, according to the control times N executed in the sampling period, calculates K
Sampling period k and k-th residing for a control moment control control moment l of the moment in sampling period k, specific as follows：
Wherein, mod (K, N) indicates to ask the integer value of K divided by N, and rem (K, N) indicates complementation, l be natural number and l≤
N；
When K evenly divisible by N can Yu 1, then the feedback quantity at k-th control moment is equal to the control instance sample value；At other
Moment, feedback quantity are equal to the predicted value at the moment, and expression formula is as follows：
Wherein, if(k, l) indicates the feedback quantity at control moment first of sampling period of k-th of single-phase inverter；I (k, l) table
Show the actual current value at l secondary control moment in the single-phase inverter kth time sampling period；Indicate single-phase inverter kth
The predicted current value at first of control moment of a sampling period；
The feedback quantity at step 2, basis current control moment, predicts next control moment under different voltage output states
Current value, obtain it is next control control the moment predicted current value, it is specific as follows：
Wherein,For K+1 control the moment output state S1 predicted current value,It is
K+1 control the moment output state S2 predicted current value,The moment is controlled in the pre- of output state S3 for K+1
Current value is surveyed, Tc indicates that controlling cycle, Ug (K) are the inverse electromotive force that single-phase inverter controls the moment in k-th, and Vdc is single
The voltage of phase inverter DC terminal；
Scalar function value J (K) under step 3, the different output states of calculating | S1,J(K)|S2With J (K) | S3, expression formula
It is as follows：
Wherein, i*(K+1) reference value of the output current at the K+1 control moment for being；
Step 4 compares scalar function 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 that k-th controls the moment is state S1；If m=2, k-th control the moment it is inverse
Become device output as state S2；If all non-above, state S is just selected3Output as inverter；Meanwhile when the K+1 control of note
The predicted current value at quarter
Control times N=the f executed in the sampling periodc/fs, wherein fcFor the control frequency of single-phase inverter, fs
For the sample frequency of single-phase inverter, N is the natural number more than 1, value range 2-5.
The sample frequency f of the single-phase invertersFor 10kHz to 20kHz.
After adopting the above scheme, under the premise of ensuring output current control effect, primary sampling repeatedly control is realized,
Hardware requirement of the control system to sampling unit is reduced, the complexity of sample circuit is reduced from demand and reduces hardware
Cost.
Description of the drawings
Fig. 1 is the operating circuit of single-phase inverter；
Fig. 2 is the output current tracking effect for the single-phase inverter that forecast Control Algorithm using the present invention is realized；
Fig. 3 is the error of the output current for the single-phase inverter that forecast Control Algorithm using the present invention is realized；
Fig. 4 is the spectrum analysis figure of the output current of this hair single-phase inverter.
Specific implementation mode
Present invention is disclosed a kind of improved model forecast Control Algorithms of single-phase inverter, are set within a sampling period
Multiple control moment are set to control the output of single-phase inverter；In each sampling period, output current is sampled first
Actual current value is obtained, using actual current value as feedback quantity, predicts next control moment under different voltage status
Output current value obtains predicted current value；Then by being traversed to predicted current value, determination is immediate with reference current
Voltage status as single-phase inverter the control moment output.Second in the sampling period controls the moment, due to not
Sampling obtains single-phase inverter currently to control the feedback quantity progress Model Predictive Control of predicted current value as electric current at moment
In the output at then control moment, repeats above procedure and arrive until next sampling period；Then one under single-phase inverter
The Model Predictive Control in a sampling period.
The circuit diagram of single-phase inverter is as shown in Figure 1, single-phase inverter passes through resistance and the concatenated filter of inductance
It is connected with inverse electromotive force.Wherein, resistance value is R, and inductance value is L, and inverse electromotive force is Ug, the electricity of single-phase inverter DC terminal
Pressure is denoted as Vdc.The output current of single-phase inverter is i, and the reference value of the output current of single-phase inverter is i*, it is the base of standard
Wave sinusoidal signal.There are three types of states for single-phase inverter output current, export and are denoted as state S for Vdc1, export and be denoted as state S for 02,
Output is that-Vdc is denoted as state S3。
Model Predictive Control, sample frequency f are carried out to unidirectional inverter shown in FIG. 1s, sample frequency fsTo set
Definite value is generally 10kHz to 20kHz.The control number executed in sampling period is that the quantity at control moment is N, N=fc/
fs, fcFrequency in order to control, N are the natural number more than 1, value range 2-5.
Then the Model Predictive Control at the k-th control moment of the single-phase inverter is specific as follows：
Step 1, the feedback quantity for determining the k-th control moment；
First, corresponding k and l is calculated according to known N at the k-th control moment, wherein k is that k-th controls the moment
Residing sampling period number, l are the control moment in the sampling period residing for the k-th control moment.K=(k-1) * N+l.Change speech
It,
Wherein, mod (K, N) indicates to ask the integer value of K divided by N, and rem (K, N) indicates complementation, l be natural number and l≤
N。
Then, the feedback quantity at k-th control moment is sought, if K evenly divisible by N can Yu 1, has value of feedback equal to the control
Instance sample value processed；At other moment, feedback quantity is equal to the predicted value at the moment.Expression formula is as follows：
Wherein, if(k, l) indicates the feedback quantity at control moment first of sampling period of k-th of single-phase inverter；I (k, l) table
Show the actual current value at l secondary control moment in the single-phase inverter kth time sampling period；Indicate single-phase inverter kth
The predicted current value at first of control moment of a sampling period.
Step 2, the feedback quantity that the moment is controlled according to single-phase inverter k-th predict the K+1 control moment different
Current value under voltage output state obtains the predicted current value at the K+1 control moment, specific as follows：
Wherein, TC=1/fC, indicate controlling cycle；Ug (K) indicates that inverse electromotive force controls the value at moment in k-th.Due to
Inverse electromotive force frequency and amplitude are it is known that therefore Ug (K) is given value.
Scalar function J (K) under step 3, the different output states of calculating | S1,J(K)|S2With J (K) | S3, computational methods are such as
Under：
Step 4 compares scalar function 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 that k-th controls the moment is state S1；If m=2, k-th control the moment it is inverse
Become device output as state S2；If all non-above, state S is just selected3Output as inverter.Meanwhile when the K+1 control of note
The predicted current value at quarter
Fig. 2 is the output current tracking effect of single-phase inverter, and Fig. 3 is single-phase inverter output current error, from Fig. 2 and
Fig. 3 is it is found that model prediction method using the present invention can effectively ensure that single-phase inverter exports sinusoidal waveform, and error is small.
Fig. 4 is the spectrum analysis figure of the output current of single-phase inverter, wherein total harmonic distortion THD=1.92%<5%, meet
National standard GB/T 14549-93 requirements.
To sum up, under the premise of ensuring output current control effect, primary sampling repeatedly control is realized, control is reduced
System reduces the complexity of sample circuit from demand and reduces the cost of hardware to the hardware requirement of sampling unit.
The above is only the embodiment of the present invention, is not intended to limit the scope of the present invention, therefore every
According to the technical essence of the invention to any subtle modifications, equivalent variations and modifications made by above example, this is still fallen within
In the range of inventive technique scheme.
Claims (4)
1. a kind of improved model forecast Control Algorithm of single-phase inverter, it is characterised in that：The model predictive control method is logical
It crosses and multiple control moment is set within the sampling period to control the output of single-phase inverter；In each sampling period, right first
Output current is sampled to obtain actual current value, using actual current value as feedback quantity, predicts next control moment not
Output current value under same voltage status obtains the predicted current value at next control moment；When then by next control
It carves predicted current value to be traversed, determine with the immediate voltage status of reference current as single-phase inverter at the control moment
Output；
Second in the sampling period controls the moment, using the predicted current value at current time as the feedback quantity of electric current, prediction
Output current value of next control moment under different voltage status, obtains the predicted current value at next control moment；So
It is traversed, is determined with the immediate voltage status of reference current as single by the predicted current value to next control moment afterwards
Phase inverter controls the output at moment at second, and so on, until next sampling period.
2. a kind of improved model forecast Control Algorithm of single-phase inverter according to claim 1, it is characterised in that：It is described
Each of single-phase inverter controls the moment when carrying out Model Predictive Control, specifically executes following steps：
Step 1, the feedback quantity for determining the current control moment；
The current control moment is denoted as k-th and controls the moment, according to the control times N executed in the sampling period, calculates k-th control
Sampling period k and k-th residing for moment processed control control moment l of the moment in sampling period k, specific as follows：
Wherein, mod (K, N) indicates that the integer value of K divided by N, rem (K, N) is asked to indicate complementation, and l is natural number and l≤N；
When K evenly divisible by N can Yu 1, then the feedback quantity at k-th control moment is equal to the control instance sample value；At other moment,
Feedback quantity is equal to the predicted value at the moment, and expression formula is as follows：
Wherein, if(k, l) indicates the feedback quantity at control moment first of sampling period of k-th of single-phase inverter；I (k, l) indicates single
The actual current value at l secondary control moment in the phase inverter kth time sampling period；Indicate that single-phase inverter is adopted for k-th
The predicted current value at first of control moment of sample period；
The feedback quantity at step 2, basis current control moment predicts electricity of next control moment under different voltage output states
Flow valuve obtains the predicted current value at next control control moment, specific as follows：
Wherein,For K+1 control the moment output state S1 predicted current value,For K+1
Control the moment output state S2 predicted current value,Prediction of the moment in output state S3 is controlled for K+1
Current value, Tc indicate that controlling cycle, Ug (K) are the inverse electromotive force that single-phase inverter controls the moment in k-th, and Vdc is single-phase
The voltage of inverter DC terminal；
Scalar function value J (K) under step 3, the different output states of calculating | S1,J(K)|S2With J (K) | S3, expression formula is as follows：
Wherein, i*(K+1) reference value of the output current at the K+1 control moment for being；
Step 4 compares scalar function 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 that k-th controls the moment is state S1；If m=2, the inverter at k-th of control moment
Output is state S2；If all non-above, state S is selected3Output as inverter；Meanwhile note the K+1 controls the pre- of moment
Survey current value
3. a kind of improved model forecast Control Algorithm of single-phase inverter according to claim 1, it is characterised in that：It is described
Control times N=the f executed in sampling periodc/fs, wherein fcFor the control frequency of single-phase inverter, fsFor single-phase inverter
Sample frequency, N is natural number more than 1, value range 2-5.
4. a kind of improved model forecast Control Algorithm of single-phase inverter according to claim 3, it is characterised in that：It is described
The sample frequency f of single-phase invertersFor 10kHz to 20kHz.
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