CN108964640A - Frequency conversion triangular carrier generator and APF based on carrier cycle modulation technique - Google Patents
Frequency conversion triangular carrier generator and APF based on carrier cycle modulation technique Download PDFInfo
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- CN108964640A CN108964640A CN201810780379.0A CN201810780379A CN108964640A CN 108964640 A CN108964640 A CN 108964640A CN 201810780379 A CN201810780379 A CN 201810780379A CN 108964640 A CN108964640 A CN 108964640A
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
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- 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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- 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
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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
- Y02E40/30—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
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- Inverter Devices (AREA)
Abstract
A kind of APF based on carrier cycle modulation technique the present invention relates to frequency conversion triangular carrier generator and comprising generator, the generator include following program modules: frequency conversion carried-based PWM signal generation module；Frequency conversion triangular carrier frequency instantaneous value waveform generating module；Frequency conversion triangular carrier generation module；Digital frequency conversion triangular carrier generation module.The triangular carrier generator of fixed frequency is replaced using frequency conversion triangular carrier generator proposed by the present invention, it can be changed by triangular carrier frequency with periodic trigonometric signal rule to eliminate harmonic wave at carrier frequency, while inhibiting APF current on line side electromagnetic interference, total harmonic distortion is improved.
Description
Technical field
The invention belongs to Active Power Filter-APF control fields, and in particular to a kind of frequency conversion triangular carrier generator and be based on
The parallel connection type active electric filter of carrier cycle modulation technique.
Background technique
Parallel connection type active electric filter (Active Power Filter, APF) can effectively solve harmonic pollution in electric power net etc.
Problem, it can carry out quick tracing compensation to harmonic wave, negative-sequence current existing for network system and reactive power.Traditional APF
Compensation electric current is generated using carrier frequency PWM technology is determined.According to pulse length modulation principle, the compensation generated in carrier frequency pwm converter is determined
Electric current has the biggish harmonic wave cluster of amplitude at integral multiple switching frequency.Therefore, based on the APF for determining carrier frequency PWM technology, although route
The low-order harmonic of electric current is strongly attenuated, but the harmonic wave cluster at integral multiple carrier frequency has also been introduced simultaneously.As untreated, not only
The compensation effect that APF can be reduced, the electromagnetic interference generated by carrier frequency harmonic wave cluster (Electromagnetic Interference,
EMI power supply line or the sensitive electronic equipment near it) also be will affect.
For this problem, common solution is to improve switching frequency.With the raising of switching frequency, carrier frequency harmonic wave
Frequency also correspondingly increase, the amplitude of carrier frequency harmonic wave is reduced.But this method can bring biggish switching loss,
It under high-power environment and is not suitable for, and is limited by power device switching frequency.Another solution is filtered using EMI
Device, but this will increase the volume and cost of APF.
Summary of the invention
The invention solves a technical problem be to provide a kind of frequency conversion triangular carrier generator.
In order to solve the above-mentioned technical problem, frequency conversion triangular carrier generator of the invention includes following program modules:
Frequency conversion carried-based PWM signal generation module: the modulated signal of setting frequency conversion triangular carrier is triangular wave, week
Phase is Tm, peak-to-peak value is 2 × Peakm；A timed interrupt cycle t is calculated according to formula (1)1；If the amplitude initial value of modulated signal
Equal to 0；Cumulative 1 or the calculating of regressive 1 are carried out to modulation signal amplitude in each A timed interrupt cycle: when modulated signal width
Value it is cumulative 1 to 800 when enter 1 state of regressive, cumulative 1 state is entered when modulated signal amplitude regressive 1 to -800, repeatedly this is followed
It is 2 × Peak that ring, which obtains peak-to-peak value,m, period TmFrequency conversion carried-based PWM signal；
Frequency conversion triangular carrier frequency instantaneous value waveform generating module: the centre frequency of setting frequency conversion triangular carrier is fa0；Root
Frequency conversion triangular carrier frequency instantaneous value f is calculated according to formula (2)a(t), frequency conversion triangular carrier frequency instantaneous value waveform is obtained；
fa(t)=fa0+fm(t) (2)
Wherein fm(t)=Um(t)×1V/Hz；UmIt (t) is the amplitude instantaneous value of frequency conversion carried-based PWM signal；
Frequency conversion triangular carrier generation module: frequency conversion triangular carrier is calculated at each frequency values according to formula (3)
Amplitude instantaneous value；
Peaka[i] is frequency conversion triangular carrier in frequency values fa0+fm(Ti) at amplitude instantaneous value；fa0+fm(Ti) it is frequency conversion
Triangular carrier is in TiThe frequency instantaneous value at moment；fm(Ti)=Um(Ti) × 1V/Hz, Um(Ti) it is frequency conversion carried-based PWM signal
In TiThe amplitude instantaneous value at moment；
Setting B timed interrupt cycle is t2, frequency conversion triangular carrier Ua(t) amplitude initial value is 0；Frequency conversion triangle is read to carry
Wave is in frequency values fa0+fm(Ti) at amplitude instantaneous value Peaka[i]；In each timed interrupt cycle t2It is interior that frequency conversion triangle is carried
The amplitude of wave cumulative 1 or regressive 1 calculate: when amplitude adds up 1 to PeakaEnter 1 state of regressive when [i]；When amplitude regressive 1 to 0
When read frequency conversion triangular carrier in frequency values fa0+fm(Ti+1) at peak value Peaka[i+1] value simultaneously enters cumulative 1 state, repeats
This circulation obtains frequency conversion triangular carrier Ua(t)；
Digital frequency conversion triangular carrier generation module: setting peak value of the digital frequency conversion triangular carrier at each frequency values is
Peakc, according to formula (3) obtain peak value it is identical and be equal to PeakcDigital frequency conversion triangular carrier Uc(t)；
。
The invention solves another technical problem be to provide a kind of base comprising above-mentioned frequency conversion triangular carrier generator
In the APF of carrier cycle modulation technique；The APF further includes digital modulation wave producer, driving circuit, H bridge；Digital modulation wave hair
Raw device generates digital modulation wave；Digital modulation wave generates first switch control signal OPWM1 compared with digital frequency conversion triangular carrier,
Second switch control signal OPWM2 is obtained after OPWM1 is negated；Digital modulation wave negates rear compared with digital frequency conversion triangular carrier
Third switch control signal OPWM3 is generated, the 4th switch control signal OPWM4 is obtained after OPWM3 is negated；First switch control
Signal OPWM1, second switch control signal OPWM2, third switch control signal OPWM3 and the 4th switch control signal OPWM4
It is input in driving circuit, driving circuit exports 4 tunnels and controls signal, the conducting and shutdown of 4 switching tubes of H bridge is controlled, so that APF
Get access to grid side generation compensation electric current.
Determine that carrier frequency APF has the problems such as obvious harmonic wave cluster at integral multiple carrier frequency to solve, the invention proposes a kind of changes
Frequency triangular carrier generator, to replace the triangular carrier generator of fixed frequency, by triangular carrier frequency with periodic trigonometric
Signal rule changes to eliminate harmonic wave at carrier frequency.While inhibiting APF current on line side electromagnetic interference, improve THD.
The triangular carrier frequency for modulating APF changes according to triangle signal rule, by each carrier frequency harmonic wave of APF current on line side
Energy spread to the frequency band of surrounding in.Compared with determining carrier frequency APF, the APF based on periodic modulation technology can effectively reduce net
The carrier frequency harmonic amplitude of side electric current, while improving total harmonic distortion (THD).
Main advantages of the present invention are:
(1) control circuit can be programmed by FPGA and be realized, any additional devices are not necessarily on original conditioned basic,
By changing master controller FPGA program, harmonic wave of the APF current on line side at integral multiple carrier frequency just can be effectively suppressed, improve simultaneously
THD；
(2) it compared with common APF and other modulation techniques, can be designed according to the spectrum distribution feature of required current on line side
It is suitble to the modulated signal of itself, obtains better carrier frequency harmonic suppression effect.
Studies have shown that carrier frequency modulation technique (Carrier Frequency Modulation, CFM) is to inhibit carrier frequency
The preferred plan of harmonic wave.Its working principle is that modulating constant carrier frequency is changing value, by each single carrier frequency harmonic wave
In energy transmission to the frequency band of surrounding, to reduce the peak amplitude of carrier frequency harmonic wave.Currently, carrier frequency modulation technique mainly has
Randomized modulation, chaotic modulation technology, periodic modulation technology.Random signal and mixed pure signal all have randomness, therefore
Modulated spectrum distribution is similar.Carrier frequency harmonic amplitude can effectively reduce using randomized modulation and chaotic modulation technology, but
The spread spectrum range of carrier frequency harmonic wave is wide, introduces a large amount of low-frequency harmonics, lacks total harmonic distortion (Total Harmonic
Distortion, THD) control.In contrast, periodic modulation technology will spread scope limitation in a deckle strap, can press down
The generation of low-frequency harmonics is avoided while harmonic spike processed.The present invention uses the APF based on periodic modulation technology, effectively reduces
The carrier frequency harmonic amplitude of current on line side, while improving total harmonic distortion (THD).
Detailed description of the invention
Invention is further described in detail with reference to the accompanying drawings and detailed description.
Fig. 1 is the parallel connection type APF structural schematic diagram based on carrier frequency modulation technique.
Fig. 2 is frequency conversion triangular carrier generator functional block diagram.
Fig. 3 is modulated signal instantaneous amplitude waveform diagram.
Fig. 4 is frequency conversion triangular carrier frequency instantaneous value waveform diagram.
Fig. 5 is frequency conversion triangular carrier waveform diagram.
Fig. 6 is digital frequency conversion triangular wave waveform figure.
Fig. 7 is digital modulation wave waveform diagram.
A, b in Fig. 8 are traditional network side current waveform figure and spectrogram after determining carrier frequency APF compensation respectively.
A, b in Fig. 9 be respectively based on carrier cycle modulation technique of the present invention APF compensation after network side current waveform figure and
Spectrogram.
Specific embodiment
As shown in Figure 1, the parallel connection type APF based on carrier frequency modulation technique includes driving circuit, H bridge, by digital modulation
Wave producer, triangular carrier generator, first comparator 11, the second comparator 12, the first phase inverter 21, the second phase inverter 22,
The control circuit that third phase inverter 23, compensation current collection circuit, DC voltage Acquisition Circuit are constituted；The output of driving circuit with
The control signal of H bridge connects；The non-inverting input terminal and the of the output end connection first comparator 11 of digital modulation wave producer
The input terminal of three phase inverters 23, the output end of third phase inverter 23 are connected to the non-inverting input terminal of the second comparator 12；Triangle carries
The output end of wave producer is connected to the inverting input terminal of first comparator 11 and the second comparator 12；First comparator 11 it is defeated
Outlet is connected to the input terminal a of driving circuit1It is connected to the output end of the input terminal of the first phase inverter 21, the first phase inverter 21
The input terminal a of driving circuit2；The output end of second comparator 12 is connected to the input terminal a for being connected to driving circuit3With the second reverse phase
The output end of the input terminal of device 22, the second phase inverter 22 is connected to the input terminal a of driving circuit4；Compensate current collection circuit string
It connects at the exchange end of H bridge, and its output end is connected to the input terminal b of digital modulation wave producer2；DC voltage Acquisition Circuit is simultaneously
The DC terminal in H bridge is connect, and its output end is connected to the input terminal b of digital modulation wave producer3.Wherein digital modulation wave occurs
Device, triangular carrier generator, first comparator 11, the second comparator 12, the first phase inverter 21, the second phase inverter 22, third are anti-
Phase device 23 can be realized by hardware circuit, can also write program realization；Compensation output current collection circuit uses electric current suddenly
You realize sensor；DC voltage Acquisition Circuit is realized using voltage hall sensor.The parallel connection type APF intermediate cam of the prior art
Carrier generator replaces determining frequency triangular carrier using frequency conversion triangular carrier generator using frequency triangular carrier generator, the present invention is determined
Generator.
As shown in Figure 1, in order to realize that the function for the parallel connection type APF for using carrier frequency modulation technique also needs to include net side
Input voltage Us, nonlinear load and nonlinear load current collection circuit；The nonlinear load is connected in parallel on net side input
Voltage both ends；APF is connected in parallel on nonlinear load both ends；Nonlinear load current collection circuit is serially connected in nonlinear load input
End, and its output end is connected to the input terminal b of digital modulation wave producer in APF1；Wherein nonlinear load current collection circuit
It is realized using current Hall sensor.
Frequency conversion triangular carrier generator is specifically described below.It is specific in order to describe more clearly to give each parameter
Value, but these design parameter values should not be understood as limiting the scope of the invention.
As shown in Fig. 2, frequency conversion triangular carrier generator of the invention includes following program modules:
Frequency conversion carried-based PWM signal generation module: the modulated signal of setting frequency conversion triangular carrier is triangular wave, week
Phase is Tm(TmGenerally select the 1/2 of digital modulation wave period), peak-to-peak value is 2 × Peakm；It is calculated in A timing according to formula (1)
Disconnected period t1If the amplitude initial value of modulated signal is equal to 0；In each A timed interrupt cycle to modulation signal amplitude into
Row cumulative 1 or regressive 1 calculate: when modulated signal amplitude it is cumulative 1 to 800 when enter 1 state of regressive, when modulated signal amplitude regressive
Enter cumulative 1 state when 1 to -800, repeats this circulation and obtain peak-to-peak value to be 2 × Peakm=1600, period Tm=10ms's
Frequency conversion carried-based PWM signal；As shown in figure 3, Tm=10ms, 2 × Peakm=1600, t1=3125ns；
Frequency conversion triangular carrier frequency instantaneous value waveform generating module: the centre frequency of setting frequency conversion triangular carrier is fa0(fa0
Numerical values recited be equal to switching frequency, carrier frequency harmonic amplitude reduce after, frequency band broadens；Band bandwidth numerical value after broadening is equal to
2×Peakm)；Frequency conversion triangular carrier frequency instantaneous value f is calculated according to formula (2)a(t), frequency conversion triangular carrier frequency is obtained
Instantaneous value waveform, as shown in figure 4, wherein fa0=10000Hz；
fa(t)=fa0+fm(t) (2)
Wherein fm(t)=Um(t)×1V/Hz；UmIt (t) is the amplitude instantaneous value of frequency conversion carried-based PWM signal；
Frequency conversion triangular carrier generation module: frequency conversion triangular carrier is calculated at each frequency values according to formula (3)
Amplitude instantaneous value；
Peaka[i] is frequency conversion triangular carrier in frequency values fa0+fm(Ti) at amplitude instantaneous value；fa0+fm(Ti) it is frequency conversion
Triangular carrier is in TiThe frequency instantaneous value at moment；fm(Ti)=Um(Ti) × 1V/Hz, Um(Ti) it is frequency conversion carried-based PWM signal
In TiThe amplitude instantaneous value at moment；
Setting B timed interrupt cycle is t2(t2Smaller precision is higher, and the present invention selects t2=50ns), frequency conversion triangular carrier
Ua(t) amplitude initial value is 0；Frequency conversion triangular carrier is read in frequency values fa0+fm(Ti) at amplitude instantaneous value Peaka[i]；
In each timed interrupt cycle t2The interior amplitude to frequency conversion triangular carrier cumulative 1 or regressive 1 calculate: 1 arriving when amplitude adds up
PeakaEnter 1 state of regressive when [i]；Frequency conversion triangular carrier is read when amplitude regressive 1 to 0 in frequency values fa0+fm(Ti+1) at
Peak value Peaka[i+1] value simultaneously enters cumulative 1 state, repeats this circulation and obtains frequency conversion triangular carrier Ua(t), as shown in Figure 5；
Digital frequency conversion triangular carrier generation module: setting peak value of the digital frequency conversion triangular carrier at each frequency values is
Peakc=2048, according to formula (3) obtain peak value it is identical and be equal to 2048 digital frequency conversion triangular carrier Uc(t), such as Fig. 6 institute
Show；
Digital modulation wave Ur (t) is generated by digital modulation wave producer, as shown in Figure 7；Digital modulation wave and number are become
Frequency triangular carrier, which compares, generates first switch control signal OPWM1, and second switch control signal is obtained after OPWM1 is negated
OPWM2；Third switch control signal OPWM3 is generated after digital modulation wave is negated compared with digital frequency conversion triangular carrier, it will
OPWM3 obtains the 4th switch control signal OPWM4 after negating.
By first switch control signal OPWM1, second switch control signal OPWM2, third switch control signal OPWM3 and
4th switch control signal OPWM4 is input in the driving circuit of APF, and driving circuit exports 4 tunnels and controls signal, controls 4, H bridge
The conducting and shutdown of switching tube, so that APF gets access to grid, side generates compensation electric current, and guarantee power grid input current is sine-wave current,
A in Fig. 8 is to determine network side current waveform figure after carrier frequency APF compensation, and a in Fig. 9 is that the APF based on carrier frequency modulation technique is mended
Repay rear network side current waveform figure.
B in Fig. 8 is to determine current on line side spectrogram after carrier frequency APF compensation, and the b in Fig. 9 is to modulate skill based on carrier frequency
Current on line side spectrogram after the APF compensation of art.Comparison diagram 8 and Fig. 9 can be obtained, after the APF compensation based on carrier frequency modulation technique
Harmonic spike of the current on line side at 1 times of carrier frequency, which reduces 0.12, THD, reduces 0.42%, and realizing reduces carrier frequency harmonic peaks
THD is optimized while value.
Claims (2)
1. a kind of frequency conversion triangular carrier generator, it is characterised in that including following program modules:
Frequency conversion carried-based PWM signal generation module: the modulated signal of setting frequency conversion triangular carrier is triangular wave, and the period is
Tm, peak-to-peak value is 2 × Peakm；A timed interrupt cycle t is calculated according to formula (1)1；If the amplitude initial value of modulated signal is equal to
0；Cumulative 1 or the calculating of regressive 1 are carried out to modulation signal amplitude in each A timed interrupt cycle: when modulated signal amplitude is tired
Enter 1 state of regressive when adding 1 to 800, cumulative 1 state is entered when modulated signal amplitude regressive 1 to -800, repeats this and recycle
It is 2 × Peak to peak-to-peak valuem, period TmFrequency conversion carried-based PWM signal；
Frequency conversion triangular carrier frequency instantaneous value waveform generating module: the centre frequency of setting frequency conversion triangular carrier is fa0；According to public affairs
Frequency conversion triangular carrier frequency instantaneous value f is calculated in formula (2)a(t), frequency conversion triangular carrier frequency instantaneous value waveform is obtained；
fa(t)=fa0+fm(t) (2)
Wherein fm(t)=Um(t)×1V/Hz；UmIt (t) is the amplitude instantaneous value of frequency conversion carried-based PWM signal；
Frequency conversion triangular carrier generation module: width of the frequency conversion triangular carrier at each frequency values is calculated according to formula (3)
It is worth instantaneous value；
Peaka[i] is frequency conversion triangular carrier in frequency values fa0+fm(Ti) at amplitude instantaneous value；fa0+fm(Ti) it is frequency conversion triangle
Carrier wave is in TiThe frequency instantaneous value at moment；fm(Ti)=Um(Ti) × 1V/Hz, Um(Ti) it is frequency conversion carried-based PWM signal in Ti
The amplitude instantaneous value at moment；
Setting B timed interrupt cycle is t2, frequency conversion triangular carrier Ua(t) amplitude initial value is 0；Frequency conversion triangular carrier is read to exist
Frequency values fa0+fm(Ti) at amplitude instantaneous value Peaka[i]；In each timed interrupt cycle t2It is interior to frequency conversion triangular carrier
Amplitude cumulative 1 or regressive 1 calculate: when amplitude adds up 1 to PeakaEnter 1 state of regressive when [i]；It is read when amplitude regressive 1 to 0
Take frequency conversion triangular carrier in frequency values fa0+fm(Ti+1) at peak value Peaka[i+1] value simultaneously enters cumulative 1 state, repeats this and follows
Ring obtains frequency conversion triangular carrier Ua(t)；
Digital frequency conversion triangular carrier generation module: setting peak value of the digital frequency conversion triangular carrier at each frequency values is Peakc, root
According to formula (3) obtain peak value it is identical and be equal to PeakcDigital frequency conversion triangular carrier Uc(t)；
2. a kind of APF based on carrier cycle modulation technique comprising frequency conversion triangular carrier generator as described in claim 1；
Characterized by further comprising digital modulation wave producer, driving circuit, H bridges；Digital modulation wave producer generates digital modulation wave；
Digital modulation wave generates first switch control signal OPWM1 compared with digital frequency conversion triangular carrier, and the is obtained after OPWM1 is negated
Two switch control signal OPWM2；Digital modulation wave generates third switch control letter after negating compared with digital frequency conversion triangular carrier
Number OPWM3, obtains the 4th switch control signal OPWM4 after OPWM3 is negated；First switch controls signal OPWM1, second switch
Control signal OPWM2, third switch control signal OPWM3 and the 4th switch control signal OPWM4 are input in driving circuit, are driven
Dynamic 4 tunnel of circuit output controls signal, controls the conducting and shutdown of 4 switching tubes of H bridge, so that APF gets access to grid, side generates compensation electricity
Stream.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112928757A (en) * | 2021-02-05 | 2021-06-08 | 长春工业大学 | Periodic frequency modulation APF variable carrier frequency digital PI control system and control method thereof |
| CN113364255A (en) * | 2021-03-09 | 2021-09-07 | 国网浙江省电力有限公司湖州供电公司 | Frequency-staggered current converter unit and control method |
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| CN113364255A (en) * | 2021-03-09 | 2021-09-07 | 国网浙江省电力有限公司湖州供电公司 | Frequency-staggered current converter unit and control method |
| CN113364255B (en) * | 2021-03-09 | 2023-09-01 | 国网浙江省电力有限公司湖州供电公司 | Frequency-staggered converter unit and control method |
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| CN108964640B (en) | 2021-11-16 |
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