CN109546655A - Multichannel harmonic wave active suppressing apparatus and method - Google Patents
Multichannel harmonic wave active suppressing apparatus and method Download PDFInfo
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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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- 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
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- 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 discloses a kind of multichannel harmonic wave active suppressing apparatus and methods, device includes the first current sensor, second current sensor, main control unit, signal processing unit, signal synthesis unit and power amplification unit, first current sensor is connected with main control unit, second current sensor is connected with signal processing unit, main control unit is connected with signal processing unit, the output end of signal processing unit is connected with the input terminal of signal synthesis unit, the output end of signal synthesis unit is connected with the input terminal of power amplification unit, the output end of power amplification unit passes through signal decanting point and power grid bus short join；First current sensor, the second current sensor and power grid bus are not connected directly, but are installed on the two sides of the signal decanting point of power grid bus.Harmonic wave state in real-time monitoring power grid of the present invention, tracking target harmonic frequency variation, while multiple harmonic components in power grid are accurately compensated；Signal processing unit can be according to actually increasing or decreasing.
Description
Technical field
The present invention relates to field of electromagnetic compatibility, and in particular to a kind of multichannel harmonic wave active suppressing apparatus and method, to electricity
Multiple harmonic waves in road are inhibited simultaneously, are mainly used for inhibiting the DC grid of supply network especially commutator generator output
The each harmonic of middle appearance interferes.
Background technique
In power supply, in electricity system, when sinusoidal voltage is applied to nonlinear circuit or non-sinusoidal voltage is applied to linearly
When on circuit, non-sinusoidal current can be all generated, contains harmonic components in non-sinusoidal periodic current, passes through Fourier space
It decomposes, it is known that harmonic frequency is theoretically the integral multiple of fundamental frequency, and overtone order is the integer of harmonic frequency and fundamental frequency
Than.Harmonic wave reduces the production, transmission and the efficiency utilized of electric energy, makes device of overheating of electrical, generates vibration and noise, and makes absolutely
Edge material aging, reduced service life；In addition, harmonic wave can cause to lead when electric system local parallel resonant or serious series resonance
It causes electrical equipment malfunction or even burns；Harmonic wave can also cause relay protection and automatic device to malfunction, and mix electrical energy measurement
Disorderly；Outside electric system, harmonic wave can generate severe jamming to communication equipment and electronic equipment.Therefore, the improvement of harmonic wave at
For very important research field in electromagnetic compatibility subject and electrical engineering subject.Currently, being infused by certain device into power grid
Enter, the electric current of opposite in phase equal in magnitude with harmonic current, so that the method for offsetting harmonic wave is widely applied.
Summary of the invention
The technical problem to be solved by the present invention is to provide for the above problem existing for existing communication equipment harmonic wave control
A kind of multichannel harmonic wave active suppressing apparatus and method, the harmonic wave state in real-time monitoring power grid, using certain algorithm keeps track
The variation of target harmonic frequency simultaneously can accurately compensate multiple harmonic components in power grid.
Used technical solution is the present invention to solve above-mentioned technical problem:
Multichannel harmonic wave active suppressing apparatus, including the first current sensor, the second current sensor, main control unit, letter
Number processing unit, signal synthesis unit and power amplification unit, the first current sensor are connected with main control unit, and the second electric current passes
Sensor is connected with signal processing unit, and main control unit is connected with signal processing unit, the output end and signal of signal processing unit
The input terminal of synthesis unit is connected, and the output end of signal synthesis unit is connected with the input terminal of power amplification unit, power amplification
The output end of unit passes through signal decanting point and power grid bus short join；First current sensor, the second current sensor with
Power grid bus is not connected directly, but is installed on the two sides of the signal decanting point of power grid bus.
According to the above scheme, first current sensor, the second current sensor use sieve Koffsky (Rogwski) line
Circle is made into the retractable structure with soft nonmetallic (such as plastics) for skeleton.
According to the above scheme, the main control unit uses the controller based on ARM chip STM32F407, and I2C is arranged in controller
Communication protocol interface and ADC interface, I2C communication protocol interface are connect with signal processing unit, ADC interface and the first current sense
The Rogowski coil of device connects.
According to the above scheme, the signal processing unit include motherboard and C1, C2 ... the total X control unit plate of CX, motherboard
On X golden finger slot, I2C communication protocol interface, analog signal interface are at least set and connect with signal synthesis unit
Interface, X golden finger slot be respectively used to assign C1, C2 ... CX control unit plate is simultaneously powered to each control unit plate and logical
(spare golden finger slot can also be arranged, enhance system function for assigning additional control unit plate) in letter；I2C is logical
Believe that the I2C communication protocol interface of protocol interface and controller connects, the Luo Kefu of analog signal interface and the second current sensor
The connection of this lubber ring.
According to the above scheme, the hardware specification of each control unit plate is identical, by ARM chip STM32F407 and several
Peripheral circuit composition, wherein I2C communication protocol interface pin, ADC interface pin, DAC pin, the chip power of ARM chip draw
Foot draws the finger plug for being connected to circuit board lower end, the interface physical size and pin of finger plug define on motherboard
Golden finger slot matches.
According to the above scheme, the signal synthesis unit follows circuit and analog addition circuit to be sequentially connected in series by signal,
Signal follows the analog input interface of circuit and the motherboard of signal processing unit to connect, analog addition circuit setting simulation letter
Number output interface.
According to the above scheme, the power amplification unit uses inverter, the analog input interface of inverter and simulation
The analog signal output interface of add circuit connects, and the positive and negative output of the power signal output interface of inverter is respectively connected to
The positive electrode bus and negative electrode bus of power grid bus.
The present invention also provides a kind of suppressing methods of above-mentioned multichannel harmonic wave active suppressing apparatus, include the following steps:
(1) after device powers on, when a period of time T starts, letter that main control unit sends out the first current sensor
Harmonic current transducing signal S1 on the left of number decanting point is analyzed, and is found out amplitude in harmonic current transducing signal S1 and is exceeded thresholding
The harmonic frequency of value P, wherein P is the threshold value manually set, if it is more than threshold value P that discovery, which has the amplitude of N number of harmonic wave, according to humorous
The amplitude of these harmonic waves is denoted as ordered series of numbers A1, A2 ..., AN, the frequency of corresponding harmonic wave by the descending sequence of the amplitude of wave
Rate is denoted as F1, F2 ..., FN；
(2) control unit the plate C1, C2 ..., CX into signal processing unit send control signal to main control unit respectively,
Wherein X is the number of control unit, assigns target frequency value to each control unit；
(3) as N >=X, after control unit plate C1, C2 ..., CX receive respective target frequency value (control signal),
Simple signal W1, W2 ..., WX of the generation frequency for F1, F2 ..., FX respectively, feeding signal synthesis unit, simple signal W1,
W2 ..., the respective amplitude and phase of WX are determined by the algorithm in each control unit plate；It is similar with N>=X as N<X, but the
N+1 does not work to X control unit plate (C (N+1) to CX control unit plate)；
(4) as N >=X, signal synthesis unit generates signal W according to simple signal W1, W2 ..., the WX of input；When N <
When X, signal synthesis unit generates signal W according to simple signal W1, W2 ..., the WN of input；Signal W is sent into power amplification list
Member generates signal U；
(5) at signal decanting point, signal U is superimposed with the harmonic current signal V on power grid bus, generate signal D, second
The harmonic current transducing signal S2 of current sensor output is the Result of Indirect Measurement of signal D amplitude；
(6) as N >=X, control unit plate C1, C2 ..., CX receive harmonic current transducing signal S2, according to control algolithm
(such as fft algorithm) adjusts the respective amplitude and phase of simple signal W1, W2 ..., WX of its output；As N < X, control unit
Plate C1, C2 ..., CN receive harmonic current transducing signal S2, according to control algolithm, adjust the simple signal W1 of its output,
W2 ..., the respective amplitude and phase of WN；To change the waveform of signal U, and then change the waveform of signal D, makes harmonic current
Frequency is that the amplitude of the frequency content of F1, F2 ..., FX is minimum in transducing signal S2, reaches and inhibits frequency on the right side of signal decanting point
For F1, F2 ..., the purpose of the harmonic wave of FX；
(7) it in each period of time T, repeats step (1) and arrives step (6).
According to the above scheme, in the step (1), if N >=X, only retain ordered series of numbers A1, A2 ..., AN and F1, F2 ...,
The preceding X data of FN retain ordered series of numbers A1, A2 ..., AN and F1, all N number of data of F2 ..., FN if N < X.
According to the above scheme, the step (2) specifically: if N >=X, main control unit controls signal E1 by sending,
Data F1, F2 ..., FX are respectively fed to control unit plate C1, C2 ..., CX by E2 ..., EX；If N < X, main control unit is sent
Signal E1, E2 ..., EN are controlled, data F1, F2 ..., FN are respectively fed to control unit plate C1, C2 ..., CN.
Compared with prior art, the beneficial effects of the present invention are:
1, the harmonic wave state in real-time monitoring power grid of the present invention is changed using certain algorithm keeps track target harmonic frequency,
Multiple harmonic components in power grid can accurately be compensated simultaneously；Using main control unit periodically to signal decanting point left side
Harmonic current transducing signal analyzed, the major harmonic frequency of dynamic analysis power grid, for the change of harmonic frequency in power grid
Change, the frequency of itself output electric current is adjusted, so that frequency content included in dynamic updating device output signal, avoids because of electricity
Major harmonic frequency shift (FS) bring harmonic compensation effect caused by the factors such as net electrical appliance variation deteriorates the problems such as unstable；
2, each control unit plate inside signal processing unit, all harmonic wave on the right side of reception signal decanting point sense letter
Number, according to control algolithm, the amplitude and phase of itself output signal are adjusted, achievees the purpose that inhibit specific frequency harmonic wave；
3, multiple corresponding harmonic waves in power grid are inhibited using expansible signal path module, signal processing unit
It can be increased according to practical application request, such as the major harmonic number or manufacturing cost for needing to inhibit with hardware or software mode
Or reduce its internal corresponding control unit.
Detailed description of the invention
Fig. 1 is the functional block diagram of multichannel harmonic wave active suppressing apparatus of the present invention；
Fig. 2 is the overall composition block diagram that multichannel harmonic wave active suppressing apparatus works in embodiment；
Fig. 3 is current sensor implementation method schematic diagram in the embodiment of the present invention；
Fig. 4 is the shape of signal processing unit and physical interface schematic diagram in the embodiment of the present invention；
Fig. 5 is the shape of control unit and physical interface schematic diagram in the embodiment of the present invention；
Fig. 6 is the composition block diagram of signal synthesis unit in the embodiment of the present invention；
Fig. 7 is that device starts preceding power network current time domain waveform in the embodiment of the present invention；
Fig. 8 is that device starts preceding mains by harmonics current frequency domain waveform diagram in the embodiment of the present invention；
Fig. 9 be in the embodiment of the present invention device starting after power network current time domain waveform；
Figure 10 be in the embodiment of the present invention device starting after mains by harmonics current frequency domain waveform diagram.
Specific embodiment
The present invention is explained in more detail below by embodiment, but following embodiment is merely illustrative, it is of the invention
Protection scope is not limited to these embodiments restrictions.
As shown in Figure 1, multichannel harmonic wave active suppressing apparatus of the present invention, including the first current sensor 1, second
Current sensor 2, main control unit 3, signal processing unit 4, signal synthesis unit 5 and power amplification unit 6, the first current sense
Device 1 is connected with main control unit 3, and the second current sensor 2 is connected with signal processing unit 4, main control unit 3 and signal processing unit
4 are connected, and signal processing unit 4 is connected with signal synthesis unit 5, and signal synthesis unit 5 is connected with power amplification unit 6, power
Amplifying unit 6 is shorted by signal decanting point 7 and power grid bus 8；First current sensor 1, the second current sensor 2 and power grid
Bus 8 is not connected directly, and by indirect measures such as MISE A LAMASSE METHODs, completes the reality of the harmonic current on power grid bus 8
When measure.
As shown in Fig. 2, combining when multichannel harmonic wave active suppressing apparatus of the present invention works by 12 pulsating wave commutator generator
The DC grid that group 9 and ohmic load 10 form works together, and corresponding component corresponds to serial number 11~20 in device, and output is straight
Galvanic electricity stream is about 1120A, by 12 pulsating wave rectification principle it is found that 12 pulsating wave commutator generator group 9 is a harmonic source in itself,
The each harmonic frequency content using 2400Hz as fundamental frequency has been superimposed in DC current.In embodiment, device is needed to flowing through resistance
These three harmonic components of 2400Hz, 4800Hz, 7200Hz of load 10 are inhibited.
First current sensor 1 of the present apparatus, the second current sensor 2 are respectively by sieve Koffsky (Rogwski) coil
11, it 12 realizes, is made into the retractable structure with soft nonmetallic (such as plastics) for skeleton, be easily installed in detection position,
It is as shown in Figure 3 with the connection method schematic diagram of power grid bus.
The main control unit 3 of the present apparatus is realized that controller 13 has I2C by the controller 13 based on ARM chip STM32F407
Communication protocol interface 21 and ADC (conversion of analog to digital signal) interface 22, I2C communication protocol interface 21 and signal processing unit 4
The I2C communication protocol interface 27 of motherboard 14 connect, ADC interface 22 connect with Rogowski coil 11.
The signal processing unit 4 of the present apparatus is realized that signal processing unit 4 is wrapped by motherboard 14 and control unit plate 15,16,17
Include motherboard 14 and C1, C2 ... golden finger slot 23,24,25, I2C communication protocols is arranged on motherboard 14 in CX total X control unit plate
Interface 27 and analog signal interface 28 are discussed, as shown in Fig. 4, motherboard 14 is by golden finger slot 23,24,25, respectively to assigning
The power supply of control unit plate 15,16,17 and communication, golden finger slot 26 thereon is used as standby slot, can assign additional control
Cell board is to enhance system function；The I2C communication protocol interface 27 of motherboard 14 and the I2C communication protocol interface 21 of controller 13
Connection, analog signal interface 28 are connect with Rogowski coil 12, interface 29,30,31,32 and follow-up signal synthesis unit 5
Signal follow the interface 33,34,35,36 of circuit 18 to connect.
The hardware specification of control unit plate 15,16,17 is identical, if as shown in figure 5, by ARM chip STM32F407 and
Dry peripheral circuit forms, wherein I2C communication protocol interface pin, ADC interface pin, the DAC (digital-analog signal of ARM chip
Conversion) pin, chip power pin draw the finger plug for being connected to circuit board lower end, the interface physical size of finger plug
And pin defines and matches with the golden finger slot 23,24,25 on motherboard 14.
The signal synthesis unit 5 of the present apparatus follows circuit 18 and analog addition circuit 19 to be sequentially connected in series by signal, on
It states circuit to be made of operational amplifier and peripheral components, as shown in Fig. 6, signal follows circuit 18 to input by analog signal
Interface 33,34,35,36 is separately connected with interface 29,30,31,32, and analog addition circuit 19 passes through analog signal output interface 37
It is connect with the analog input interface of inverter 20.
The power amplification unit 6 of the present apparatus realized by inverter 20, the analog input interface of inverter 20 and simulation
The analog signal output interface 37 of add circuit 19 connects, the positive and negative output difference of the power signal output interface of inverter 20
It is connected to the positive electrode bus and negative electrode bus of power grid bus 8.
The course of work of the present embodiment is as follows:
(1) start 12 pulsating wave commutator generator group 9 first, measure the electric current time domain for flowing through load 10, frequency-domain waveform point
Not as shown in attached drawing 7, Fig. 8.
(2) after device starting, controller 13 is every a period of time T=100ms, and using FFT, (fast Fourier becomes
Changing) algorithm analyzes the signal S1 from Rogowski coil 11 primary, find out the thresholding that amplitude in signal S1 is more than setting
The harmonic frequency of value P=110dBuA, according to the amplitude sequence from big to small of harmonic wave, when power grid major harmonic frequency values are not sent out
When changing, show that major harmonic frequency is 2400Hz, 4800Hz, 7200Hz, 9600Hz, due to the control unit in embodiment
Plate quantity is 3, therefore by 2400Hz, tri- target frequency values of 4800Hz, 7200Hz are respectively transmitted by I2C communication protocol interface 21
To control unit plate 15,16,17, target frequency value is accomplished to from fft algorithm and is sent into control unit plate 15,16,17, time-consuming is about
10ms。
(3) it after control unit plate 15,16,17 receives respective target frequency value, generates and target harmonic frequency respectively
Equal output signal follows circuit 18, analog addition circuit 19, inverter 20 via signal, each to control by current fed power grid
Algorithm in cell board 15,16,17 processed analyzes the current feedback signal from Rogowski coil 12, and adjustment is respective
The amplitude and phase of signal, until the residual error of feedback signal is minimum, this dynamic process is not more than 50ms.Therefore this implementation
In example, the working time period T=100ms of controller 13 allows system to reach harmonics restraint stable state enough.
(4) when device reaches harmonics restraint stable state, electric current time domain, the frequency-domain waveform for flowing through network load 10 are such as attached respectively
Shown in Fig. 9, Figure 10, it is seen that three harmonic components have reached the decaying of 50dB or more.
(5) it within next 100ms time cycle, repeats the above process.
(6) it needs to inhibit the harmonic wave of 9600Hz as live, then it will be complete with control unit plate 15,16,17 after shutting down
Exactly the same control unit plate is inserted into motherboard slot 26；Conversely, installed control unit plate can be removed, reach cost
The purpose taken into account with effect.
Disclosure sets forth the methods and dresses that by active injection mode, inhibited simultaneously to multiple harmonic waves in circuit
It sets, multiple harmonic components in power grid accurately can be compensated simultaneously；Corresponding control can be increased according to practical application request
Molding block extends the overtone order of compensation；Adaptive algorithm inside its control module, can be to the power grid being connected with device
Impedance harmony intensity of wave situation carries out real-time tracking, to adjust itself output electric current for the variation of harmonic frequency in power grid
Frequency and phase, avoid because frequency shift (FS), external impedance variation due to cause compensation effect unstable the problems such as, fundamentally shut out
Exhausted oscillation risks.
The above is presently preferred embodiments of the present invention, it is intended to illustrate exemplary implementation and workflow of the invention,
However due to power electronic devices and the diversity of field condition, implementation method of the invention also has larger flexibility, therefore
The present invention should not be limited to the embodiment and attached drawing disclosure of that.So all do not depart from spirit disclosed in this invention
The equivalent or modification of lower completion, for example, certain devices in embodiment are replaced, increase slot quantity, to certain functions
Unit merges, carries out part change to certain unit to enhance the measures such as its function, both falls within the scope of protection of the invention.
Claims (10)
1. multichannel harmonic wave active suppressing apparatus, which is characterized in that including the first current sensor, the second current sensor, master
Control unit, signal processing unit, signal synthesis unit and power amplification unit, the first current sensor are connected with main control unit,
Second current sensor is connected with signal processing unit, and main control unit is connected with signal processing unit, signal processing unit it is defeated
Outlet is connected with the input terminal of signal synthesis unit, the input terminal phase of the output end and power amplification unit of signal synthesis unit
Even, the output end of power amplification unit passes through signal decanting point and power grid bus short join；First current sensor, the second electricity
Flow sensor is not connected directly with power grid bus, but is installed on the two sides of the signal decanting point of power grid bus.
2. multichannel harmonic wave active suppressing apparatus according to claim 1, which is characterized in that first current sense
Device, the second current sensor use Rogowski coil, are made into the soft nonmetallic retractable structure for skeleton.
3. multichannel harmonic wave active suppressing apparatus according to claim 1, which is characterized in that the main control unit uses base
In the controller of ARM chip STM32F407, I2C communication protocol interface and ADC interface, I2C communication protocol interface is arranged in controller
It is connect with signal processing unit, ADC interface is connect with the Rogowski coil of the first current sensor.
4. multichannel harmonic wave active suppressing apparatus according to claim 3, which is characterized in that the signal processing unit packet
Include motherboard and C1, C2 ... X golden finger slot is at least arranged on motherboard in CX total X control unit plate, I2C communication protocol connects
Mouthful, analog signal interface and the interface being connect with signal synthesis unit, X golden finger slot be respectively used to assign C1,
C2 ... CX control unit plate is simultaneously powered and is communicated to each control unit plate；The I2C of I2C communication protocol interface and controller is logical
Believe protocol interface connection, analog signal interface is connect with the Rogowski coil of the second current sensor.
5. multichannel harmonic wave active suppressing apparatus according to claim 4, which is characterized in that each control unit plate it is hard
Part specification is identical, is made of ARM chip STM32F407 and several peripheral circuits, wherein the I2C communication protocol of ARM chip
Interface pin, ADC interface pin, DAC pin, chip power pin draw the finger plug for being connected to circuit board lower end, golden hand
The interface physical size and pin for referring to plug define and match with the golden finger slot on motherboard.
6. multichannel harmonic wave active suppressing apparatus according to claim 1, which is characterized in that the signal synthesis unit by
Signal follows circuit and analog addition circuit to be sequentially connected in series, and signal follows at the analog input interface and signal of circuit
The motherboard connection of unit is managed, analog signal output interface is arranged in analog addition circuit.
7. multichannel harmonic wave active suppressing apparatus according to claim 1, which is characterized in that the power amplification unit is adopted
It is connect with the analog input interface of inverter, inverter with the analog signal output interface of analog addition circuit, inverter
The positive and negative output of power signal output interface be respectively connected to the positive electrode bus and negative electrode bus of power grid bus.
8. a kind of suppressing method of the described in any item multichannel harmonic wave active suppressing apparatus of the claims 1~7, feature
It is, includes the following steps:
(1) after device powers on, when a period of time T starts, main control unit infuses the signal that the first current sensor is sent out
Harmonic current transducing signal S1 on the left of access point is analyzed, and is found out amplitude in harmonic current transducing signal S1 and is exceeded threshold value P
Harmonic frequency, wherein P is the threshold value manually set, if to have the amplitude of N number of harmonic wave be more than threshold value P for discovery, according to harmonic wave
The descending sequence of amplitude, the amplitude of these harmonic waves is denoted as ordered series of numbers A1, A2 ..., AN, the frequency of corresponding harmonic wave
It is denoted as F1, F2 ..., FN；
(2) control unit the plate C1, C2 ..., CX into signal processing unit send control signal to main control unit respectively, wherein X
For the number of control unit, target frequency value is assigned to each control unit；
(3) as N >=X, after control unit plate C1, C2 ..., CX receive respective target frequency value, generating frequency respectively is
Simple signal W1, W2 ..., the WX of F1, F2 ..., FX are sent into signal synthesis unit, and simple signal W1, W2 ..., WX are respectively
Amplitude and phase determined by the algorithm in each control unit plate；It is similar with N>=X as N<X, but N+1 to X control
Cell board processed does not work；
(4) as N >=X, signal synthesis unit generates signal W according to simple signal W1, W2 ..., the WX of input；As N < X,
Signal synthesis unit generates signal W according to simple signal W1, W2 ..., the WN of input；Signal W is sent into power amplification unit, produces
Raw signal U；
(5) at signal decanting point, signal U is superimposed with the harmonic current signal V on power grid bus, generates signal D, the second electric current
The harmonic current transducing signal S2 of sensor output is the Result of Indirect Measurement of signal D amplitude；
(6) as N >=X, control unit plate C1, C2 ..., CX receive harmonic current transducing signal S2, according to control algolithm, adjust
Simple signal W1, the W2 of its whole output ..., the respective amplitude and phase of WX；As N < X, control unit plate C1, C2 ..., CN
Harmonic current transducing signal S2 is received, according to control algolithm, adjusts the respective width of simple signal W1, W2 ..., WN of its output
Degree and phase；To change the waveform of signal U, and then change the waveform of signal D, makes frequency in harmonic current transducing signal S2
The amplitude of the frequency content of F1, F2 ..., FX is minimum, reaches and inhibits signal decanting point right side frequency for the humorous of F1, F2 ..., FX
The purpose of wave；
(7) it in each period of time T, repeats step (1) and arrives step (6).
9. the suppressing method of multichannel harmonic wave active suppressing apparatus according to claim 8, which is characterized in that the step
(1) in, if N>=X, only retain ordered series of numbers A1, the preceding X data of A2 ..., AN and F1, F2 ..., FN, if N<X, encumbrance
A1, A2 are arranged ..., AN and F1, F2 ..., all N number of data of FN.
10. the suppressing method of multichannel harmonic wave active suppressing apparatus according to claim 8, which is characterized in that the step
Suddenly (2) specifically: if N >=X, main control unit is by sending control signal E1, E2 ..., EX, by data F1, F2 ..., FX points
Not Song Ru control unit plate C1, C2 ..., CX；If N < X, main control unit sends control signal E1, E2 ..., EN, by data F1,
F2 ..., FN is respectively fed to control unit plate C1, C2 ..., CN.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108110759A (en) * | 2017-12-29 | 2018-06-01 | 国网北京市电力公司 | Control circuit |
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| CN1734877A (en) * | 2005-08-09 | 2006-02-15 | 华中科技大学 | Multi-channel harmonic wave restraining device |
| CN103701127A (en) * | 2013-12-27 | 2014-04-02 | 国电南京自动化股份有限公司 | Novel active power filtering device and control method thereof |
| CN104393605A (en) * | 2014-10-23 | 2015-03-04 | 哈尔滨工业大学 | Reactive continuous compensation control method for thyristor switched filter |
| CN205489530U (en) * | 2016-04-14 | 2016-08-17 | 哈尔滨理工大学 | Automatic synchronous accurate control electric wire netting harmonic device |
| CN108110759A (en) * | 2017-12-29 | 2018-06-01 | 国网北京市电力公司 | Control circuit |
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