CN108964640B - Variable frequency triangular carrier generator and active power filter based on carrier period modulation technology - Google Patents

Variable frequency triangular carrier generator and active power filter based on carrier period modulation technology Download PDF

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CN108964640B
CN108964640B CN201810780379.0A CN201810780379A CN108964640B CN 108964640 B CN108964640 B CN 108964640B CN 201810780379 A CN201810780379 A CN 201810780379A CN 108964640 B CN108964640 B CN 108964640B
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frequency
triangular carrier
frequency conversion
carrier
peak
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CN108964640A (en
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陈楠
黄勇
刘丹威
刘诗淼
王艳双
王博
高丽辉
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Jilin Boan Fire Fighting Equipment Co ltd
Jilin Boan Intelligent Technology Co ltd
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K7/00—Modulating pulses with a continuously-variable modulating signal
    • H03K7/06—Frequency or rate modulation, i.e. PFM or PRM
    • 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
    • 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
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/12—Arrangements for reducing harmonics from ac input or output
    • 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
    • Y02E40/30—Reactive power compensation
    • 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 relates to a frequency conversion triangle carrier wave generator and an APF (amplitude phase filter) containing the generator based on a carrier wave periodic modulation technology, wherein the generator comprises the following program modules: a frequency conversion triangular carrier modulation signal generation module; a frequency conversion triangular carrier frequency instantaneous value waveform generating module; a frequency conversion triangular carrier generation module; and a digital frequency conversion triangular carrier generation module. The variable-frequency triangular carrier generator provided by the invention is adopted to replace a triangular carrier generator with fixed frequency, so that harmonic waves at carrier frequency can be eliminated through the regular change of triangular carrier frequency along with periodic triangular signals, and the total harmonic distortion is improved while the current electromagnetic interference at the APF network side is inhibited.

Description

Variable frequency triangular carrier generator and active power filter based on carrier period modulation technology
Technical Field
The invention belongs to the field of active power filter control, and particularly relates to a variable frequency triangular carrier generator and a parallel active power filter based on a carrier period modulation technology.
Background
The parallel Active Power Filter (APF) can effectively solve the problems of harmonic pollution of a Power grid and the like, and can quickly track and compensate harmonic waves, negative sequence current and reactive Power existing in a Power grid system. Conventional APFs employ fixed carrier frequency PWM techniques to generate the compensation current. According to the pulse width modulation principle, the compensation current generated in the fixed carrier frequency PWM converter has harmonic clusters with larger amplitude at integral multiple of the switching frequency. Therefore, the APF based on the fixed carrier frequency PWM technique, while the low-order harmonics of the line current are strongly attenuated, also introduces harmonic clusters at integer multiple carrier frequencies. If not processed, not only the compensation effect of the APF is reduced, but also Electromagnetic Interference (EMI) generated by the carrier frequency harmonic cluster affects the power line or the sensitive electronic devices nearby.
A common solution to this problem is to increase the switching frequency. Along with the increase of the switching frequency, the frequency of the carrier frequency harmonic is correspondingly increased, and the amplitude of the carrier frequency harmonic is reduced. However, this method causes large switching loss, is not suitable for high power environment, and is limited by the switching frequency of the power device. Another solution is to use EMI filters, but this increases the size and cost of the APF.
Disclosure of Invention
The invention aims to solve the technical problem of providing a variable-frequency triangular carrier wave generator.
In order to solve the technical problem, the variable frequency triangular carrier generator of the invention comprises the following program modules:
frequency conversion triangle carrier modulation signal generation module: setting the modulation signal of the frequency conversion triangular carrier wave as a triangular wave with a period of TmPeak-to-Peak of 2 × Peakm(ii) a Calculating A timing interruption period t according to formula (1)1(ii) a Setting the amplitude initial value of the modulation signal equal to 0; and performing accumulation 1 or accumulation 1 calculation on the amplitude value of the modulation signal in each A timing interruption period: when the amplitude of the modulation signal is accumulated to 1 to 800, the state of accumulation 1 is entered, and the cycle is repeated to obtain the Peak-Peak value of 2 x PeakmWith a period of TmThe frequency conversion triangular carrier wave modulating signal;
Figure GDA0003253620780000021
frequency conversion triangle carrier frequency instantaneous value waveform generation module: setting the center frequency of the frequency conversion triangular carrier to be fa0(ii) a Calculating to obtain the frequency conversion triangular carrier frequency transient according to the formula (2)Duration fa(t) obtaining a frequency conversion triangular carrier frequency instantaneous value waveform;
fa(t)＝fa0+fm(t) (2)
wherein f ism(t)＝Um(t)×1Hz/V；Um(t) is the amplitude instantaneous value of the frequency conversion triangular carrier modulation signal;
frequency conversion triangle carrier wave generates module: for any frequency value fa0+fm(Ti) Calculating according to the formula (3) to obtain an amplitude instantaneous value of the frequency conversion triangular carrier at the frequency value;
Figure GDA0003253620780000022
Peaka[i]for frequency-converting triangular carrier at frequency value fa0+fm(Ti) The amplitude instantaneous value of (d); f. ofa0+fm(Ti) For frequency-converting triangular carrier waves at TiA frequency instantaneous value of a time; f. ofm(Ti)＝Um(Ti)×1Hz/V，Um(Ti) Modulating a signal at T for frequency-converted triangular carriersiAn amplitude instantaneous value of a moment;
setting B timer interrupt period as t2Frequency conversion triangular carrier wave Ua(t) the initial value of the amplitude is 0; reading the frequency value f of the frequency conversion triangular carriera0+fm(Ti) At the amplitude instantaneous value Peaka[i](ii) a At each timer interrupt period t2And (3) calculating the amplitude accumulation 1 or the accumulation subtraction 1 of the inner pair frequency conversion triangular carrier wave: when the amplitude is added up to 1 to Peaka[i]Entering a state of accumulation and subtraction 1; reading the frequency-conversion triangular carrier at the frequency value f when the amplitude is reduced by 1 to 0a0+fm(Ti+1) At the amplitude instantaneous value Peaka[i+1]The value enters an accumulation 1 state, and the cycle is repeated to obtain a frequency conversion triangular carrier Ua(t)；
Digital frequency conversion triangular carrier wave generation module: the Peak values of the digital frequency conversion triangular carrier waves at each frequency value are all PeakcThe Peak values obtained according to equation (3) are the same and equal to PeakcDigital transformation ofFrequency triangular carrier Uc(t)；
Figure GDA0003253620780000031
The invention also provides an active power filter which comprises the variable frequency triangular carrier generator and is based on a carrier period modulation technology; the active power filter also comprises a digital modulation wave generator, a drive circuit and an H bridge; the digital modulation wave generator generates a digital modulation wave; comparing the digital modulation wave with a digital variable frequency triangular carrier to generate a first switch control signal OPWM1, and obtaining a second switch control signal OPWM2 after inverting OPWM 1; after the inversion of the digital modulation wave, comparing the digital modulation wave with a digital frequency conversion triangular carrier to generate a third switch control signal OPWM3, and after the inversion of OPWM3, obtaining a fourth switch control signal OPWM 4; the first switch control signal OPWM1, the second switch control signal OPWM2, the third switch control signal OPWM3 and the fourth switch control signal OPWM4 are input into the driving circuit, the driving circuit outputs 4 circuits of control signals, and the on and off of 4 switching tubes of the H bridge are controlled, so that the active power filter generates compensation current on the side of the power grid.
In order to solve the problem that the APF of the fixed carrier frequency has obvious harmonic clusters at the integral multiple carrier frequency and the like, the invention provides a variable frequency triangular carrier generator which is used for replacing a triangular carrier generator with fixed frequency and eliminating the harmonic waves at the carrier frequency by the regular change of the triangular carrier frequency along with a periodic triangular signal. The THD is improved while the electromagnetic interference of APF network side current is suppressed.
The triangular carrier frequency of the APF is modulated to change according to the triangular signal rule, and the energy of each carrier frequency harmonic wave of the APF network side current is expanded into the surrounding frequency band. Compared with the fixed carrier frequency APF, the APF based on the periodic modulation technology can effectively reduce the carrier frequency harmonic amplitude of the network side current and improve the Total Harmonic Distortion (THD).
The main advantages of the invention are:
(1) the control circuit can be realized by FPGA programming, and can effectively inhibit harmonic waves of APF network side current at integral multiple carrier frequencies and improve THD (THD) by changing the FPGA program of the main controller without any additional device on the basis of the original condition;
(2) compared with the common APF and other modulation technologies, the method can design a modulation signal suitable for the method according to the required frequency spectrum distribution characteristics of the network side current, and obtain a better carrier frequency harmonic suppression effect.
Research has shown that Carrier Frequency Modulation (CFM) is the best solution for suppressing Carrier Frequency harmonics. The operating principle is that a constant carrier frequency is modulated to a varying value to transfer the energy of each single carrier frequency harmonic into the surrounding frequency band, thereby reducing the peak amplitude of the carrier frequency harmonic. At present, the carrier frequency modulation technology mainly comprises a random modulation technology, a chaotic modulation technology and a periodic modulation technology. Both the random signal and the mixed pure signal have randomness, so that the modulated spectrum distribution is similar. The amplitude of the carrier frequency Harmonic wave can be effectively reduced by adopting a random modulation technology and a chaotic modulation technology, but the frequency spectrum expansion range of the carrier frequency Harmonic wave is too wide, a large amount of low-frequency Harmonic waves are introduced, and Total Harmonic Distortion (THD) control is lacked. In contrast, the periodic modulation technique limits the spread spectrum range to a certain sideband, and can avoid the generation of low-frequency harmonics while suppressing harmonic peaks. The invention adopts APF based on periodic modulation technology, effectively reduces the carrier frequency harmonic amplitude of the network side current, and improves the Total Harmonic Distortion (THD).
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a schematic diagram of a parallel-type APF structure based on a carrier frequency modulation technique.
Fig. 2 is a schematic block diagram of a variable frequency triangular carrier generator.
Fig. 3 is a waveform diagram of the instantaneous amplitude of a modulated signal.
Fig. 4 is a waveform diagram of a frequency converted triangular carrier frequency transient.
Fig. 5 is a diagram of a frequency converted triangular carrier waveform.
Fig. 6 is a digital frequency-converted triangular waveform diagram.
Fig. 7 is a waveform diagram of a digitally modulated wave.
A and b in fig. 8 are respectively a conventional fixed carrier frequency APF compensated grid-side current waveform diagram and a frequency spectrum diagram.
Fig. 9 a and b are respectively a net side current waveform diagram and a frequency spectrum diagram after the APF compensation based on the carrier period modulation technique of the present invention.
Detailed Description
As shown in fig. 1, the parallel APF based on the carrier frequency modulation technique includes a driving circuit, an H-bridge, and a control circuit composed of a digital modulation wave generator, a triangular carrier wave generator, a first comparator 11, a second comparator 12, a first inverter 21, a second inverter 22, a third inverter 23, a compensation current collecting circuit, and a dc voltage collecting circuit; the output of the drive circuit is connected with the control input end of the H bridge; the output end of the digital modulation wave generator is connected with the non-inverting input end of the first comparator 11 and the input end of the third inverter 23, and the output end of the third inverter 23 is connected with the non-inverting input end of the second comparator 12; the output end of the triangular carrier generator is connected to the inverting input ends of the first comparator 11 and the second comparator 12; the output of the first comparator 11 is connected to the input a of the drive circuit1And an input terminal of a first inverter 21, an output terminal of the first inverter 21 being connected to the input terminal a of the drive circuit2(ii) a The output of the second comparator 12 is connected to the input a of the driver circuit3And an input of a second inverter 22, an output of the second inverter 22 being connected to the input a of the drive circuit4(ii) a The compensating current collecting circuit is connected in series with the alternating current end of the H bridge, and the output end of the compensating current collecting circuit is connected to the input end b of the digital modulation wave generator2(ii) a The DC voltage acquisition circuit is connected in parallel with the DC end of the H bridge, and the output end of the DC voltage acquisition circuit is connected to the input end b of the digital modulation wave generator3. The digital modulation wave generator, the triangular carrier wave generator, the first comparator 11, the second comparator 12, the first inverter 21, the second inverter 22 and the third inverter 23 can be realized by hardware circuits or by programming; the compensation output current acquisition circuit is realized by adopting a current Hall sensor; the direct-current voltage acquisition circuit is realized by adopting a voltage Hall sensor. Parallel APF medium triangular carrier wave generator in prior artThe invention adopts a fixed-frequency triangular carrier generator, and adopts a variable-frequency triangular carrier generator to replace the fixed-frequency triangular carrier generator.
As shown in fig. 1, in order to realize the function of the parallel APF using the carrier frequency modulation technique, it is necessary to include the network-side input voltage UsThe nonlinear load and the nonlinear load current acquisition circuit; the nonlinear load is connected in parallel at two ends of the input voltage of the network side; APF is connected in parallel at two ends of the nonlinear load; the nonlinear load current acquisition circuit is connected in series with the nonlinear load input end, and the output end of the nonlinear load current acquisition circuit is connected to the input end b of the digital modulation wave generator in the APF1(ii) a The nonlinear load current acquisition circuit is realized by adopting a current Hall sensor.
The variable frequency triangular carrier wave generator will be explained in detail below. Specific values of the parameters are given for clarity of description, but these specific values are not to be construed as limiting the scope of the invention.
As shown in fig. 2, the variable frequency triangular carrier generator of the present invention comprises the following program modules:
frequency conversion triangle carrier modulation signal generation module: setting the modulation signal of the frequency conversion triangular carrier wave as a triangular wave with a period of Tm(T m1/2) of the digital modulation wave period is usually chosen, the Peak-to-Peak value being 2 × Peakm(ii) a Calculating A timing interruption period t according to formula (1)1Setting the initial value of the amplitude of the modulation signal equal to 0; and performing accumulation 1 or accumulation 1 calculation on the amplitude value of the modulation signal in each A timing interruption period: when the amplitude of the modulation signal is accumulated to 1 to 800, the state of accumulation 1 is entered, and the cycle is repeated to obtain the Peak-Peak value of 2 x Peakm1600 with period Tm10ms of frequency conversion triangular carrier modulation signal; as shown in FIG. 3, Tm＝10ms，2×Peakm＝1600，t1＝3125ns；
Figure GDA0003253620780000061
Variable frequency triangular carrier frequency instantaneous waveform generationA module: setting the center frequency of the frequency conversion triangular carrier to be fa0(fa0The value of the frequency band is equal to the switching frequency, and the frequency band of the carrier frequency harmonic wave becomes wider after the amplitude of the carrier frequency harmonic wave is reduced; the bandwidth value of the broadened band is equal to 2 × Peakm) (ii) a Calculating according to the formula (2) to obtain the instantaneous value f of the frequency conversion triangular carrier frequencya(t) obtaining a waveform of instantaneous value of the frequency-converted triangular carrier frequency, as shown in FIG. 4, where fa0＝10000Hz；
fa(t)＝fa0+fm(t) (2)
Wherein f ism(t)＝Um(t)×1Hz/V；Um(t) is the amplitude instantaneous value of the frequency conversion triangular carrier modulation signal;
frequency conversion triangle carrier wave generates module: calculating according to a formula (3) to obtain an amplitude instantaneous value of the variable frequency triangular carrier at each frequency value;
Figure GDA0003253620780000062
Peaka[i]for frequency-converting triangular carrier at frequency value fa0+fm(Ti) The amplitude instantaneous value of (d); f. ofa0+fm(Ti) For frequency-converting triangular carrier waves at TiA frequency instantaneous value of a time; f. ofm(Ti)＝Um(Ti)×1Hz/V，Um(Ti) Modulating a signal at T for frequency-converted triangular carriersiAn amplitude instantaneous value of a moment;
setting B timer interrupt period as t2(t2The smaller the precision is, the higher the invention selects t250ns), frequency-converting triangular carrier Ua(t) the initial value of the amplitude is 0; reading the frequency value f of the frequency conversion triangular carriera0+fm(Ti) At the amplitude instantaneous value Peaka[i](ii) a At each timer interrupt period t2And (3) calculating the amplitude accumulation 1 or the accumulation subtraction 1 of the inner pair frequency conversion triangular carrier wave: when the amplitude is added up to 1 to Peaka[i]Entering a state of accumulation and subtraction 1; reading the frequency-conversion triangular carrier at the frequency value f when the amplitude is reduced by 1 to 0a0+fm(Ti+1) Amplitude of (d)Instantaneous value Peaka[i+1]The value enters an accumulation 1 state, and the cycle is repeated to obtain a frequency conversion triangular carrier Ua(t), as shown in FIG. 5;
digital frequency conversion triangular carrier wave generation module: the Peak values of the digital frequency conversion triangular carrier waves at each frequency value are all Peakc2048, obtaining a digital frequency conversion triangular carrier U with the same peak value and 2048 according to the formula (3)c(t), as shown in FIG. 6;
Figure GDA0003253620780000071
the digital modulation wave ur (t) is generated by a digital modulation wave generator, as shown in fig. 7; comparing the digital modulation wave with a digital frequency conversion triangular carrier wave to generate a first switch control signal OPWM1, and obtaining a second switch control signal OPWM2 after inverting OPWM 1; and comparing the inverted digital modulation wave with a digital frequency conversion triangular carrier wave to generate a third switch control signal OPWM3, and inverting OPWM3 to obtain a fourth switch control signal OPWM 4.
Inputting a first switch control signal OPWM1, a second switch control signal OPWM2, a third switch control signal OPWM3 and a fourth switch control signal OPWM4 into a driving circuit of the APF, wherein the driving circuit outputs 4 circuit control signals to control the conduction and the disconnection of 4 switching tubes of the H bridge, so that the APF is connected with a power grid side to generate compensation current, the power grid input current is ensured to be sine wave current, a in fig. 8 is a network side current waveform diagram after fixed carrier frequency APF compensation, and a in fig. 9 is a network side current waveform diagram after APF compensation based on a carrier frequency modulation technology.
Fig. 8 b is a diagram of the net side current spectrum after the fixed carrier frequency APF compensation, and fig. 9 b is a diagram of the net side current spectrum after the APF compensation based on the carrier frequency modulation technique. Comparing fig. 8 and fig. 9, it can be seen that the harmonic peak value of the net side current at 1 time carrier frequency after APF compensation based on the carrier frequency modulation technique is reduced by 0.12, and the THD is reduced by 0.42%, so that the THD is optimized while the carrier frequency harmonic peak value is reduced.

Claims (2)

1. A variable frequency triangular carrier generator is characterized by comprising the following program modules:
frequency conversion triangle carrier modulation signal generation module: setting the modulation signal of the frequency conversion triangular carrier wave as a triangular wave with a period of TmPeak-to-Peak of 2 × Peakm(ii) a Calculating A timing interruption period t according to formula (1)1(ii) a Setting the amplitude initial value of the modulation signal equal to 0; and performing accumulation 1 or accumulation 1 calculation on the amplitude value of the modulation signal in each A timing interruption period: when the amplitude of the modulation signal is accumulated to 1 to 800, the state of accumulation 1 is entered, and the cycle is repeated to obtain the Peak-Peak value of 2 x PeakmWith a period of TmThe frequency conversion triangular carrier wave modulating signal;
Figure FDA0003253620770000011
frequency conversion triangle carrier frequency instantaneous value waveform generation module: setting the center frequency of the frequency conversion triangular carrier to be fa0(ii) a Calculating according to the formula (2) to obtain the instantaneous value f of the frequency conversion triangular carrier frequencya(t) obtaining a frequency conversion triangular carrier frequency instantaneous value waveform;
fa(t)＝fa0+fm(t) (2)
wherein f ism(t)＝Um(t)×1Hz/V；Um(t) is the amplitude instantaneous value of the frequency conversion triangular carrier modulation signal;
frequency conversion triangle carrier wave generates module: for any frequency value fa0+fm(Ti) Calculating according to the formula (3) to obtain an amplitude instantaneous value of the frequency conversion triangular carrier at the frequency value;
Figure FDA0003253620770000012
Peaka[i]for frequency-converting triangular carrier at frequency value fa0+fm(Ti) The amplitude instantaneous value of (d); f. ofa0+fm(Ti) For frequency-converting triangular carrier waves at TiA frequency instantaneous value of a time; f. ofm(Ti)＝Um(Ti)×1Hz/V，Um(Ti) Modulating a signal at T for frequency-converted triangular carriersiAn amplitude instantaneous value of a moment;
setting B timer interrupt period as t2Frequency conversion triangular carrier wave Ua(t) the initial value of the amplitude is 0; reading the frequency value f of the frequency conversion triangular carriera0+fm(Ti) At the amplitude instantaneous value Peaka[i](ii) a At each timer interrupt period t2And (3) calculating the amplitude accumulation 1 or the accumulation subtraction 1 of the inner pair frequency conversion triangular carrier wave: when the amplitude is added up to 1 to Peaka[i]Entering a state of accumulation and subtraction 1; reading the frequency-conversion triangular carrier at the frequency value f when the amplitude is reduced by 1 to 0a0+fm(Ti+1) At the amplitude instantaneous value Peaka[i+1]The value enters an accumulation 1 state, and the cycle is repeated to obtain a frequency conversion triangular carrier Ua(t)；
Digital frequency conversion triangular carrier wave generation module: the Peak values of the digital frequency conversion triangular carrier waves at each frequency value are all PeakcThe Peak values obtained according to equation (3) are the same and equal to PeakcDigital frequency conversion triangular carrier wave Uc(t)；
Figure FDA0003253620770000021
2. An active power filter based on a carrier period modulation technique comprising the variable frequency triangular carrier generator of claim 1; the digital modulation wave generator is characterized by also comprising a digital modulation wave generator, a drive circuit and an H bridge; the digital modulation wave generator generates a digital modulation wave; comparing the digital modulation wave with a digital variable frequency triangular carrier to generate a first switch control signal OPWM1, and obtaining a second switch control signal OPWM2 after inverting OPWM 1; after the inversion of the digital modulation wave, comparing the digital modulation wave with a digital frequency conversion triangular carrier to generate a third switch control signal OPWM3, and after the inversion of OPWM3, obtaining a fourth switch control signal OPWM 4; the first switch control signal OPWM1, the second switch control signal OPWM2, the third switch control signal OPWM3 and the fourth switch control signal OPWM4 are input into the driving circuit, the driving circuit outputs 4 circuits of control signals, and the on and off of 4 switching tubes of the H bridge are controlled, so that the active power filter generates compensation current on the side of the power grid.
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