CN114252697A - APF oversampling method, system and storage medium - Google Patents
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage
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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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
- H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
- H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
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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
- Y02E40/20—Active power filtering [APF]
Abstract
The invention provides an APF oversampling method, system and storage medium, which adopts a method of combining software and hardware and utilizes a self-contained analog-to-digital converter ADC of a main control chip CPU to calculate the frequency fcWith switching frequency f of the power devicekIn inconsistent APF, the sampling frequency f is increased by combining two ways of channel sampling frequency multiplication and increasing the sampling times in a calculation periodsFor calculating frequency fcAnd a switching frequency fkThe common multiple of the APF harmonic suppression circuit realizes oversampling of analog quantity, inhibits difference frequency subharmonic current generated in APF output current and improves system stability; according to the invention, the sampling result is obtained through the mean algorithm, so that the sampling precision is improved, the interference resistance of sampling peaks is improved, and the fluctuation rate of sampling data is reduced; the invention has low realization cost, high benefit and strong operability.
Description
Technical Field
The invention belongs to the technical field of electronic power control, and particularly relates to an APF (active power filter) oversampling method, system and storage medium.
Background
There is a control algorithm in the APF (Active power filter) to calculate the frequency fcAnd the switching frequency f of the power devicekTwo amounts; system sampling frequency fsGeneral and control algorithm calculates frequency fcEqual to the switching frequency fkNot necessarily equal. When the system sampling frequency fsAnd the switching frequency fkWhen not equal, use fdDenotes fsAnd fkIf there is a difference frequency fdA difference frequency harmonic current may be generated in the output current of the APF, which affects the stable operation of the APF, and may cause system resonance in case of serious condition, resulting in the fault shutdown of the APF; on the other hand, in APF, when the sampling frequency fsAnd calculating the frequency fcThe sampling peak is easy to generate, the fluctuation range of the sampling result is large, and the like.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: an APF oversampling method, system and storage medium are provided for suppressing generation of difference frequency subharmonic current in APF output current and improving sampling precision.
The technical scheme adopted by the invention for solving the technical problems is as follows: an APF oversampling method, setting APF switching frequency as fkSampling frequency f for APF analog quantitysThe calculation frequency of the control algorithm for the APF is fcAt a sampling frequency fsFor calculating frequency fcAnd a switching frequency fkMinimum common multiple of (c):
fs＝[fc，fk]，
and oversampling of analog quantity acquisition of the APF is realized.
According to the scheme, the method comprises the following steps:
s1: sampling the analog quantity of the APF by adopting a controller with an ADC (analog to digital converter), and setting a channel frequency multiplication coefficient of the ADC to be M so that one analog quantity is subjected to one-time sampling to obtain M sampling results;
s2: carrying out averaging processing on M sampling results obtained by one analog quantity in one sampling to obtain a sampling value of the analog quantity in the current sampling;
s3: setting the sampling times multiple of the ADC to be N, and performing analog quantity sampling for N times in a calculation period to obtain N sampling values;
s4: outputting the average value of N sampling values of the analog quantity and carrying out filtering processing;
s5: sampling frequency fsFor calculating frequency fcMN times of fs＝MNfc(ii) a Selecting a suitable value of M, N to make fsIs fcAnd fkThe common multiple of APF, the oversampling of APF analog quantity acquisition is realized.
Further, in step S1, the specific steps include: 3 ADC converters of the controller are arranged, and the number of channels of one ADC converter is 16; let A be the 15 analog quantities to be sampled by APFn，Bn，Cn(n-1, 2, 3, 4, 5); sampling 5 analog quantities by one ADC converter, and sampling each analog quantity 3 times in one sampling period, wherein the channel frequency multiplication coefficient of the ADC converter is M-3; the sampling frequency f after the frequency multiplication of the channels2＝3fs1＝3fc。
Further, in step S2, the specific steps include:
s21: analog quantity AnObtaining M sampling results V through x-th samplingAn1～VAnMAveraging the M sampling results to obtain an analog quantity AnThe sampling value at the x-th sampling is
S22: analog quantity BnObtaining M sampling results V through x-th samplingBn1～VBnMAveraging the M sampling results to obtain an analog quantity BnThe sampling value at the x-th sampling is
S23: analog quantity CnObtaining M sampling results V through x-th samplingCn1～VCnMAveraging the M sampling results to obtain an analog quantity CnThe sampling value at the x-th sampling is
Further, in step S4, the specific steps include:
s41: let x be 1, 2, …, N, for analog anThe sampling value obtained by the first sampling is
The sample value obtained by the Nth sampling is
The analog quantity a is calculated by averagingnIs sampled by a value VAnComprises the following steps:
s42: for analog quantity BnThe sampling value obtained by the first sampling is
The sample value obtained by the Nth sampling is
The analog quantity B is calculated by averagingnIs sampled by a value VBnComprises the following steps:
s43: for analog quantity CnSampling value obtained by first samplingIs composed of
The sample value obtained by the Nth sampling is
The analog quantity C is calculated by averagingnIs sampled by a value VCnComprises the following steps:
further, in step S5, the specific steps include:
let the original sampling frequency fs1＝fcThen the sampling frequency f after frequency multiplication of the channels2＝Mfs1＝Mfc；
In a control calculation period, MN times of sampling are carried out on an analog quantity, and then the sampling frequency fsFor calculating frequency fcMN times of (c):
fs＝Nfs2＝MNfs1＝MNfc；
choosing an appropriate value of M, N to make the sampling frequency fsFor calculating frequency fcAnd a switching frequency fkMinimum common multiple of (c):
fs＝[fc，fk]，
and oversampling of analog quantity acquisition of the APF is realized.
An APF oversampling system comprises a controller with an ADC converter, wherein the controller is used for collecting analog quantity of APF through the ADC converter and carrying out calculation processing.
A computer storage medium having stored therein a computer program executable by a computer processor, the computer program performing an APF oversampling method as claimed in any one of claims 1 to 6.
The invention has the beneficial effects that:
1. the invention relates to an APF oversampling method, system and storage medium, which can calculate frequencyRate fcWith switching frequency f of the power devicekIn non-uniform APF, by increasing the sampling frequency fsFor calculating frequency fcAnd a switching frequency fkThe common multiple of the APF filter unit inhibits the generation of difference frequency subharmonic current in the APF output current, improves the system stability, and has the advantages of simple realization, low cost and good effect.
2. The invention improves the sampling frequency f by combining the channel sampling frequency multiplication and the method of increasing the sampling times in a calculation periodsThe sampling result is obtained through the mean algorithm, the sampling precision is improved, the occurrence of sampling peaks is avoided, and the fluctuation rate of sampling data is reduced.
3. The invention adopts a method of combining software and hardware, utilizes the ADC of the CPU of the main control chip to exert the maximum efficiency of the CPU, improves the sampling frequency of the system, and obtains the sampling result through an average algorithm, thereby realizing the oversampling of analog quantity and improving the accuracy of analog quantity sampling data; by increasing the sampling frequency to the common multiple of the calculation frequency and the switching frequency, the difference frequency secondary current of the APF output calculation frequency and the switching frequency is avoided, the interference resistance of the sampling peak is improved, and the stability of the system is improved; the method has the advantages of low implementation cost, high benefit and strong operability.
Drawings
FIG. 1 is a flow chart of an embodiment of the present invention.
FIG. 2 is an ADC channel assignment diagram according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The invention adopts a main control Chip (CPU) provided with an analog-to-digital converter (ADC) and a corresponding software algorithm to control the sampling of APF, and the sampling frequency of the analog quantity is set as fsThe calculation frequency of the control algorithm for the APF is fcWith a switching frequency of fkFrequency difference of fd(ii) a Calculation frequency f of control algorithmcThe number of times the control algorithm is calculated per unit time, typically the sampling frequency f of the analog quantitysIs equal to the calculation frequency fcBy taking an AD sampleOne control algorithm calculation is performed for one AD conversion result. Switching frequency fkThe frequency of the PWM wave of the power main switching device is not fixed with the frequency of the control algorithm, and can be the same or different, but is fsAnd fkNot having a difference frequency f at the same timedSee, formula (1):
fd＝|fk-fc| (1)
if there is a difference frequency fdThere may be an f generated in the output current of the APFsAnd fkThe difference frequency of the harmonic current signal of (a) can cause the APF to work unstably, and even cause the system to resonate when the APF is serious. Increasing the sampling frequency f of the system analog quantitysTo the switching frequency fkAnd calculating the frequency fcThe common multiple effectively avoids the generation of difference frequency subharmonic current; simultaneously increasing the sampling frequency f of the system analog quantitysNamely, the oversampling, the sampling precision is increased, the occurrence of sampling spikes is reduced, and the system stability is improved.
The invention adopts a main control Chip (CPU) with an analog-to-digital conversion peripheral (ADC) and a corresponding software algorithm to improve the sampling frequency of analog quantity, so that the sampling frequency f of the systemsCalculating frequency f for controlcAnd a switching frequency fkThe least common multiple of (a) is shown in the formula (2):
fs＝[fc，fk] (2)
fsis fcAnd fkThe least common multiple of.
The coefficient of the frequency multiplication of the channel is marked as M, on the other hand, because the time required by the CPU to complete one-time whole AD conversion is much shorter than the time required by completing one-time control algorithm, the method of carrying out multiple AD sampling in one calculation period can be adopted to improve the sampling frequency, the times are set as N, therefore, M times N of sampling can be carried out on an analog quantity in one calculation period, M times N of sampling results are obtained in total, the M times of sampling results and the N times of sampling results are respectively averaged in one calculation period, and finally the value is taken as an input value for controlling calculation to carry out calculation, so that the improvement system can improve the analog to analog conversion efficiencySampling frequency f of quantitysFor a switching frequency fkAnd the calculated frequency f of the control algorithmcThe common multiple of the analog quantity sampling method realizes the oversampling of analog quantity acquisition and improves the sampling precision.
Referring to fig. 1, the APF oversampling method of the present invention specifically includes the steps of:
s1: setting the channel frequency multiplication coefficient of ADC as M, making each analog quantity obtain M sampling results through once sampling, and sampling frequency fsChange to M times original: the invention realizes oversampling through an ADC sampling module of a CPU, the ADC module of the CPU usually comprises 2-3 ADC converters, the ADC module of the CPU is provided with 3 ADC converters, and one ADC converter converts 16 channels at most once; let the analog quantity to be sampled of APF be An，Bn，Cn(n is 1, 2, 3, 4, 5), 15 analog quantities are obtained, and then one ADC converter samples 5 analog quantities, and samples each analog quantity 3 times in one sampling period, and the specific distribution is shown in fig. 2; since one ADC converter converts one sample sequence at a time, if each analog quantity is sampled 3 times in one sampling period, the sampling frequency is changed by fs3 times of the original; if each analog quantity is sampled 2 times, the sampling frequency fsIt becomes 2 times of the original.
S2: carrying out averaging processing on M sampling results obtained by one analog quantity in one sampling to obtain a sampling value of the analog quantity in the current sampling: by an analog quantity A1For example, let an analog quantity A1Obtaining M sampling results V through x-th samplingA11～VA1MAveraging the M sampling results to obtain an analog quantity A1The sampling value at the x-th sampling is
The specific calculation formula is shown in formula (3):
step S1 and step S2 are increasing the sampling frequencyfsAnd effectively avoids the occurrence of sampling spikes.
S3: setting the sampling times multiple of the ADC as N, performing analog quantity sampling for N times in a calculation period to obtain N sampling values with sampling frequency fsBecomes N times in step S1; sampling frequency f of APFsUsually with the calculated frequency fcEquality, i.e. sampling once and calculating once; however, the time for completing the whole analog quantity sampling is much shorter than the time for completing one-time control algorithm, so the method of sampling the analog quantity for multiple times in one calculation period is adopted to increase the sampling frequency fs。
S4: outputting the average value of the sampling values of the analog quantity for N times and carrying out filtering treatment: by an analog quantity A1For example, the first sampling results in the analog quantity A1Is sampled by
Sampling for the Nth time to obtain an analog quantity A1Is sampled by
The final sampling result V of the analog quantity A1 is obtained by the average calculation methodA1The specific calculation formula is shown as formula (3):
VA1i.e. the sampled value of the analog quantity which finally enters the control algorithm.
S5: in a control calculation period, each analog quantity is sampled by the ADC sampling module for MN times in total, so that the sampling frequency fsFor calculating frequency fcMN (c), as shown in formula (4):
fs＝MNfc (4)；
selecting a suitable value of M, N to make fsIs fcAnd fkThe common multiple of (A) meets the oversampling requirement of the APF.
The above embodiments are only used for illustrating the design idea and features of the present invention, and the purpose of the present invention is to enable those skilled in the art to understand the content of the present invention and implement the present invention accordingly, and the protection scope of the present invention is not limited to the above embodiments. Therefore, all equivalent changes and modifications made in accordance with the principles and concepts disclosed herein are intended to be included within the scope of the present invention.
Claims (8)
1. An APF oversampling method, characterized in that: let the switching frequency of APF be fkSampling frequency f for APF analog quantitysThe calculation frequency of the control algorithm for the APF is fcAt a sampling frequency fsFor calculating frequency fcAnd a switching frequency fkMinimum common multiple of (c):
fs＝[fc，fk]，
and oversampling of analog quantity acquisition of the APF is realized.
2. The APF oversampling method of claim 1, wherein: the method comprises the following steps:
s1: sampling the analog quantity of the APF by adopting a controller with an ADC (analog to digital converter), and setting a channel frequency multiplication coefficient of the ADC to be M so that one analog quantity is subjected to one-time sampling to obtain M sampling results;
s2: carrying out averaging processing on M sampling results obtained by one analog quantity in one sampling to obtain a sampling value of the analog quantity in the current sampling;
s3: setting the sampling times multiple of the ADC to be N, and performing analog quantity sampling for N times in a calculation period to obtain N sampling values;
s4: outputting the average value of N sampling values of the analog quantity and carrying out filtering processing;
s5: sampling frequency fsFor calculating frequency fcMN times of fs＝MNfc(ii) a Selecting a suitable value of M, N to make fsIs fcAnd fkThe common multiple of APF, the oversampling of APF analog quantity acquisition is realized.
3. The method of claim 2The APF oversampling method is characterized in that: in the step S1, the specific steps are as follows: 3 ADC converters of the controller are arranged, and the number of channels of one ADC converter is 16; let A be the 15 analog quantities to be sampled by APFn，Bn，Cn(n-1, 2, 3, 4, 5); sampling 5 analog quantities by one ADC converter, and sampling each analog quantity 3 times in one sampling period, wherein the channel frequency multiplication coefficient of the ADC converter is M-3; the sampling frequency f after the frequency multiplication of the channels2＝3fs1＝3fc。
4. The APF oversampling method of claim 2, wherein: in the step S2, the specific steps are as follows:
s21: analog quantity AnObtaining M sampling results V through x-th samplingAn1～VAnMAveraging the M sampling results to obtain an analog quantity AnThe sampling value at the x-th sampling is
S22: analog quantity BnObtaining M sampling results V through x-th samplingBn1～VBnMAveraging the M sampling results to obtain an analog quantity BnThe sampling value at the x-th sampling is
S23: analog quantity CnObtaining M sampling results V through x-th samplingCn1～VCnMTaking the M sampling results intoThe line average processing is carried out to obtain an analog quantity CnThe sampling value at the x-th sampling is
5. The APF oversampling method of claim 4, wherein: in the step S4, the specific steps are as follows:
s41: let x be 1, 2, …, N, for analog anThe sampling value obtained by the first sampling is
…, the Nth sampling results in a sampling value of
The analog quantity a is calculated by averagingnIs sampled by a value VAnComprises the following steps:
s42: for analog quantity BnThe sampling value obtained by the first sampling is
…, the Nth sampling results in a sampling value of
The analog quantity B is calculated by averagingnIs sampled by a value VBnComprises the following steps:
s43: for analog quantity CnThe sampling value obtained by the first sampling is
…, the Nth sampling results in a sampling value of
The analog quantity C is calculated by averagingnIs sampled by a value VCnComprises the following steps:
6. the APF oversampling method of claim 5, wherein: in the step S5, the specific steps are as follows:
let the original sampling frequency fs1＝fcThen the sampling frequency f after frequency multiplication of the channels2＝Mfs1＝Mfc；
In a control calculation period, MN times of sampling are carried out on an analog quantity, and then the sampling frequency fsFor calculating frequency fcMN times of (c):
fs＝Nfs2＝MNfs1＝MNfc；
choosing an appropriate value of M, N to make the sampling frequency fsFor calculating frequency fcAnd a switching frequency fkMinimum common multiple of (c):
fs＝[fc，fk]，
and oversampling of analog quantity acquisition of the APF is realized.
7. An APF oversampling system for use in an APF oversampling method of any one of claims 1 to 6, characterized by: the APF simulation system comprises a controller with an ADC (analog to digital converter), wherein the controller is used for collecting the analog quantity of the APF through the ADC and carrying out calculation processing.
8. A computer storage medium, characterized in that: stored therein is a computer program executable by a computer processor, the computer program performing an APF oversampling method as claimed in any one of claims 1 to 6.
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