CN109617423A - High-power extremely low frequency power and its subharmonic inhibit device - Google Patents
High-power extremely low frequency power and its subharmonic inhibit device Download PDFInfo
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- CN109617423A CN109617423A CN201811252122.4A CN201811252122A CN109617423A CN 109617423 A CN109617423 A CN 109617423A CN 201811252122 A CN201811252122 A CN 201811252122A CN 109617423 A CN109617423 A CN 109617423A
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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
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M5/4585—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only having a rectifier with controlled elements
-
- 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
- H02M1/126—Arrangements for reducing harmonics from ac input or output using passive filters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a kind of high-power extremely low frequency powers and its subharmonic to inhibit device, belongs to field of power supplies.The device includes DC Module and control module；DC Module includes two capacitors, two switching tubes and an inductance, two capacitors and two switching tubes are sequentially connected in series, one end connection of inductance is between two capacitors, the other end of inductance is connected between two switching tubes, and the input terminal and output end of DC Module are connected between two output ends of the filter module of high-power extremely low frequency power and two input terminals of inverter module；Control module, for the current value and voltage value, the voltage value of the output end of filter module and the voltage value of capacitor according to the output end of inverter module, the on-off for controlling two switching tubes keeps the pulsating power of output end of instantaneous power and inverter module of capacitor in DC Module equal.
Description
Technical field
The present invention relates to field of power supplies, in particular to a kind of high-power extremely low frequency power and its subharmonic inhibit device.
Background technique
The frequency range of very low frequencies (Extremely Low-Frequency, ELF) radio wave is in 30Hz or less.Big function
The equipment that the extremely low frequency power of rate is an artificially generated very low frequencies radio signal, power reach hundreds of kilowatts.
The output of high-power very low frequencies power inverter side is very low frequencies alternating current, can generate 2 times of power supplys in inverter side input terminal
The low frequency harmonic content of working frequency deteriorates the output harmonic wave characteristic of extremely low frequency power.Meanwhile low frequency harmonic content passes through filtering
Circuit is transmitted to rectification side and grid side, causes rectification output end inductive current to fluctuate, and generate and remove in power grid input current
Other than fundamental wave and harmonics, using twice of Frequency as the lower sideband harmonic wave at interval.Since lower sideband harmonic wave is not fallen
On the integer multiple frequency of network operation frequency, occurs in the form of subharmonic, the light of high-power extremely low frequency power can be caused
Flickering increases the harmonic loss of system, and to device pressure resistance, more stringent requirements are proposed with insulation, the reliability and service life to system
It adversely affects.It possibly even resonates with generator shafting frequency, causes electric system that synchronous concussion occurs.
Summary of the invention
The embodiment of the invention provides a kind of high-power extremely low frequency powers and its subharmonic to inhibit device.The technical solution
It is as follows:
On the one hand, the embodiment of the invention provides a kind of subharmonic of high-power extremely low frequency power to inhibit device, the dress
It sets including DC Module and control module；
The DC Module includes: two capacitors, two switching tubes and an inductance, described two capacitors and described two
Switching tube is sequentially connected in series, and one end of the inductance is connected between described two capacitors, and the other end of the inductance is connected to institute
It states between two switching tubes, the capacitor that the input terminal of the DC Module is arranged in described two capacitors is opened with adjacent
Close between pipe, the output end of the DC Module be arranged in another capacitor in described two capacitors and adjacent switching tube it
Between, the input terminal and output end of the DC Module are connected to two of the filter module of the high-power extremely low frequency power
Between output end and two input terminals of inverter module；
The control module, for obtaining the current value and voltage value, the filtering mould of the output end of the inverter module
The voltage value of the voltage value of the output end of block and the capacitor；According to the current value and voltage of the output end of the inverter module
Value, the filter module output end voltage value and the capacitor voltage value, control the on-off of described two switching tubes,
Keep the instantaneous power of capacitor in the DC Module equal with the pulsating power of the output end of the inverter module.
In an implementation of the embodiment of the present invention, the control module includes:
Acquisition unit, for acquiring the current value and voltage value, the filter module of the output end of the inverter module
The voltage value of the voltage value of output end and the capacitor；
Control unit, for according to the current value and voltage value of the output end of the inverter module, the filter module
The voltage value and preset capacitor waveform control function of the voltage value of output end, the capacitor generate capacitor waveform control letter
Number；
Pulse-width modulator, for the capacitor waveform control signal to be converted into pulse control signal；
Driving unit, for controlling the switch of described two switching tubes using the pulse control signal.
In an implementation of the embodiment of the present invention, described control unit, for according to the defeated of the inverter module
The current value and voltage value of outlet, the voltage value of the output end of the filter module and preset capacitor waveform control function meter
Calculation obtains the first voltage value；
Half by the first voltage value plus the voltage value of the output end of the filter module obtains reference value；
The voltage value of the capacitor and the reference value are subjected to phase bit comparison, generate the capacitor waveform control signal.
In an implementation of the embodiment of the present invention, described control unit, for being controlled according to following capacitor waveforms
Function calculates the first voltage value:
Wherein, VcmFor the first voltage value, VmaxFor the voltage value of the output end of the inverter module, ImaxIt is described inverse
Become the current value of the output end of module, ω is high-power very low frequencies electric power output voltage angular frequency, Pin=VmaxImax/2；VdcFor
The voltage value of the output end of the filter module.
In an implementation of the embodiment of the present invention, the acquisition unit includes:
Current sensor, first voltage sensor, second voltage sensor and tertiary voltage sensor, the current sense
Device and first voltage sensor are electrically connected with the output end of the inverter module, the second voltage sensor and the filtering
The output end of module is electrically connected, and the tertiary voltage sensor is electrically connected with the capacitor.
On the other hand, the embodiment of the invention provides a kind of high-power extremely low frequency power, the high-power extremely low frequency powers
Including sequentially connected rectification module, filter module and inverter module；
The high-power extremely low frequency power further includes that subharmonic inhibits device, and described device includes DC Module and control mould
Block；
The DC Module includes: two capacitors, two switching tubes and an inductance, described two capacitors and described two
Switching tube is sequentially connected in series, and one end of the inductance is connected between described two capacitors, and the other end of the inductance is connected to institute
It states between two switching tubes, the capacitor that the input terminal of the DC Module is arranged in described two capacitors is opened with adjacent
Close between pipe, the output end of the DC Module be arranged in another capacitor in described two capacitors and adjacent switching tube it
Between, the input terminal and output end of the DC Module are connected to two output ends and the inversion mould of the filter module
Between two input terminals of block；
The control module, for obtaining the current value and voltage value, the filtering mould of the output end of the inverter module
The voltage value of the voltage value of the output end of block and the capacitor；According to the current value and voltage of the output end of the inverter module
Value, the filter module output end voltage value and the capacitor voltage value, control the on-off of described two switching tubes,
Keep the instantaneous power of capacitor in the DC Module equal with the pulsating power of the output end of the inverter module.
In an implementation of the embodiment of the present invention, the control module includes:
Acquisition unit, for acquiring the current value and voltage value, the filter module of the output end of the inverter module
The voltage value of the voltage value of output end and the capacitor；
Control unit, for according to the current value and voltage value of the output end of the inverter module, the filter module
The voltage value and preset capacitor waveform control function of the voltage value of output end, the capacitor generate capacitor waveform control letter
Number；
Pulse-width modulator, for the capacitor waveform control signal to be converted into pulse control signal；
Driving unit, for controlling the switch of described two switching tubes using the pulse control signal.
In an implementation of the embodiment of the present invention, described control unit, for according to the defeated of the inverter module
The current value and voltage value of outlet, the voltage value of the output end of the filter module and preset capacitor waveform control function meter
Calculation obtains the first voltage value；
Half by the first voltage value plus the voltage value of the output end of the filter module obtains reference value；
The voltage value of the capacitor and the reference value are subjected to phase bit comparison, generate the capacitor waveform control signal.
In an implementation of the embodiment of the present invention, described control unit, for being controlled according to following capacitor waveforms
Function calculates the first voltage value:
Wherein, VcmFor the first voltage value, VmaxFor the voltage value of the output end of the inverter module, ImaxIt is described inverse
Become the current value of the output end of module, ω is high-power very low frequencies electric power output voltage angular frequency, Pin=VmaxImax/2；VdcFor
The voltage value of the output end of the filter module.
In an implementation of the embodiment of the present invention, the acquisition unit includes:
Current sensor, first voltage sensor, second voltage sensor and tertiary voltage sensor, the current sense
Device and first voltage sensor are electrically connected with the output end of the inverter module, the second voltage sensor and the filtering
The output end of module is electrically connected, and the tertiary voltage sensor is electrically connected with the capacitor.
Technical solution provided in an embodiment of the present invention has the benefit that
Inhibit in device in the subharmonic of the embodiment of the present invention, two output ends of two paralleled power switches in filter module
Between two input terminals of inverter module namely two paralleled power switches are on DC bus, the midpoint phase of two switching tubes
When being connected with the midpoint of two capacitors in half-bridge circuit output end, two capacitors can control by the switch of control switch pipe
Mid-point voltage.It is secondary humorous when the ripple component in capacitor instantaneous power is equal with the inversion exchange instantaneous pulsating power ingredient in side
Wave inhibits device output electric current to be compensated direct current low-frequency harmonics electric current, to inhibit the generation of net side m-Acetyl chlorophosphonazo.Solves big function
The extremely low frequency power subharmonic problem of rate, ensure that the safe and stable operation of high-power extremely low frequency power, improves power quality.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is the circuit diagram of the high-power extremely low frequency power of one kind provided in an embodiment of the present invention；
Fig. 2 is that the subharmonic of the high-power extremely low frequency power of one kind provided in an embodiment of the present invention inhibits the structure of device to show
It is intended to；
Fig. 3 and Fig. 4 is the voltage current waveform that subharmonic is added and inhibits high-power extremely low frequency power before device；
Fig. 5 and Fig. 6 is the voltage current waveform that subharmonic is added and inhibits high-power extremely low frequency power after device；
Fig. 7 is the harmonic power waveform that subharmonic provided in an embodiment of the present invention inhibits device；
Fig. 8 is the capacitance voltage waveform that subharmonic provided in an embodiment of the present invention inhibits device.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing to embodiment party of the present invention
Formula is described in further detail.
Fig. 1 is the circuit diagram of the high-power extremely low frequency power of one kind provided in an embodiment of the present invention.Referring to Fig. 1, this is high-power
Extremely low frequency power includes sequentially connected rectification module 101, filter module 102 and inverter module 103.
As shown in Figure 1, rectification module 101 is using the three-phase controlled rectifier circuit based on thyristor.Rectification module 101 is adopted
With double LC filter circuits, and then stabilize rectification circuit output ripple voltage.Inverter module 103 is single-phase bridge inverter circuit.
Further, which configures the quantity of power supply unit, each power supply list according to power demand
Member includes aforementioned rectification module 101, filter module 102 and inverter module 103, and power supply unit is connected directly in inverting output terminal
Constitute Concatenated multilevel inverter circuit.The input terminal of power supply unit is connected with phase-shifting transformer 104, constitutes multi-pulse rectification electricity
Road provides multiple independent DC sources for multi-level inverter circuit, improves grid side power quality.Wherein, multi-pulse rectification electricity
Road can regard a DC power supply as, connect multiple power supply units behind it.The exchange of power grid connects phase-shifting transformer and connects more pulse waves again
Alternating current is become the direct current shaken by a small margin by rectification circuit.The effect of multiple pulse rectification circuit is by multiple inverter circuits
The harmonic wave of generation is cancelled out each other triple-frequency harmonics ingredient therein at phase-shifting transformer, and influence of this triple-frequency harmonics to power grid
Very big, reduce triple-frequency harmonics can be improved the power quality of power grid to after.
Specifically, the input terminal of phase-shifting transformer 104 is the three-phase alternating current U of power grid outputs, the electricity of the three-phase alternating current
Stream is is, electrical grid transmission electric energy to phase-shifting transformer 104 can be the Z in figure by very long conducting wire, the impedance of conducting wires1。
Fig. 2 is that the subharmonic of the high-power extremely low frequency power of one kind provided in an embodiment of the present invention inhibits the structure of device to show
It is intended to.As shown in Fig. 2, when high-power extremely low frequency power only includes a power supply unit, then no setting is required phase-shifting transformer
104。
Referring to Fig. 1 and Fig. 2, which further includes that subharmonic inhibits device 105.Subharmonic inhibits device
105 quantity is equal with the quantity of power supply unit, and the subharmonic is provided in each power supply unit and inhibits device 105.
Referring to Fig. 1, subharmonic inhibition device 105 is placed on the DC side of the power supply unit of high-power extremely low frequency power,
It is in parallel with DC bus, it is equivalent to a harmonic wave occurring source, tracks the order harmonic components of DC side, and it is equal to generate amplitude therewith
Contrary compensation electric current offsets the harmonic current generated by low frequency inverter side, so that DC side electric current is tended to direct current, avoid low
Frequency electric current is transmitted to rectification side and net side, thus achievees the purpose that inhibit net side subharmonic.Wherein, DC bus is power grid
Direct current component of the alternating current after multiple pulse rectification circuit, refers to the input side of inverter module 103 in the present embodiment,
It is u in Fig. 1 and Fig. 2dBoth ends.
Referring to fig. 2, it includes DC Module 151 and control module 152 which, which inhibits 105 device of device,.
The DC Module 151 includes: two capacitor Cm1And Cm2, two switch transistor Ts5And T6An and inductance Lf, described
Two capacitor Cm1And Cm2With described two switch transistor Ts5And T6It is sequentially connected in series, the inductance LfOne end be connected to described two electricity
Hold Cm1And Cm2Between, the inductance LfThe other end be connected to described two switch transistor Ts5And T6Between.Wherein, capacitor Cm1And Cm2
For identical capacitor, switch transistor T5And T6Identical switching tube.
In this embodiment, the input terminal of the DC Module 151 be arranged in a capacitor in described two capacitors with
Between adjacent switching tube, another capacitor in described two capacitors and adjacent is arranged in the output end of the DC Module
Between switching tube.As shown in Fig. 2, the input terminal of DC Module 151 is arranged in capacitor Cm1And switch transistor T5Between, DC Module
151 output end is arranged in capacitor Cm2And switch transistor T6Between.The input terminal and output end of the DC Module 151 are separately connected
Between two output ends of the filter module 102 of the high-power extremely low frequency power and two input terminals of inverter module 103,
The input terminal of the i.e. described DC Module 151 is connected to an output end of the filter module 102 of the high-power extremely low frequency power
Between the corresponding input terminal of inverter module 103, i.e., the output end of the described DC Module 151 is connected to the high-power very low frequencies
Between the another output and the corresponding input terminal of inverter module 103 of the filter module 102 of power supply.As shown in Fig. 2, inversion mould
Block 103 is a bridge structure, one output end is located at switch transistor T1And switch transistor T2Between, another output is located at switch
Pipe T3And switch transistor T4Between；One input terminal of inverter module 103 is located at switch transistor T1And switch transistor T3Between, another is defeated
Enter end and is located at switch transistor T2And switch transistor T4Between.Two output ends of filter module 102 are respectively capacitor C2Both ends.
The control module 152 is used to obtain the current value and voltage value, the filter of the output end of the inverter module 103
The voltage value of the output end of wave module 102 and the capacitor Cm1Or Cm2Voltage value；According to the defeated of the inverter module 103
The current value and voltage value of outlet, the voltage value of the output end of the filter module 102 and the capacitor Cm1Or Cm2Voltage
Value, controls described two switch transistor Ts5And T6On-off, make capacitor C in the DC Module 151m1And Cm2Instantaneous power and institute
The pulsating power for stating the output end of inverter module 103 is equal.
Inhibit in device 105 in the subharmonic of the embodiment of the present invention, two switch transistor Ts5And T6Parallel filtering module 102
Between two output ends and two input terminals of inverter module 103 namely two switch transistor Ts5And T6It is connected in parallel on DC bus,
The midpoint of two switching tubes is equivalent to half-bridge circuit output end, with two capacitor Cm1And Cm2Midpoint be connected, pass through control switch
Pipe T5And T6Switch i.e. can control two capacitor Cm1And Cm2Mid-point voltage.As capacitor Cm1And Cm2Pulsation in instantaneous power
When ingredient is equal with the inversion exchange instantaneous pulsating power ingredient in side, subharmonic inhibits the output electric current of device 105 to be compensated direct current
Low-frequency harmonics electric current, to inhibit the generation of net side m-Acetyl chlorophosphonazo.It solves the problems, such as high-power extremely low frequency power subharmonic, ensure that big
The safe and stable operation of the extremely low frequency power of power, improves power quality.
Referring to fig. 2, which may include:
Acquisition unit (not shown), for acquiring the current value and voltage value, institute of the output end of the inverter module
State the voltage value of the output end of filter module and the voltage value of the capacitor；
Control unit 1521, for the current value and voltage value, the filtering mould according to the output end of the inverter module
The voltage value and preset capacitor waveform control function of the voltage value of the output end of block, the capacitor generate the control of capacitor waveform
Signal processed；
Pulse-width modulator 1522, for the capacitor waveform control signal to be converted into pulse control signal；
Driving unit 1523, for controlling the switch of described two switching tubes using the pulse control signal.
In this implementation, described control unit 1521, for the current value according to the output end of the inverter module
The first electricity is calculated with voltage value, the voltage value of the output end of the filter module and preset capacitor waveform control function
Pressure value；
Half by the first voltage value plus the voltage value of the output end of the filter module obtains reference value；
The voltage value of the capacitor and the reference value are subjected to phase bit comparison, generate the capacitor waveform control signal.
In this implementation, described control unit 1521, described in being calculated according to following capacitor waveform control functions
The first voltage value:
Wherein, VcmFor the first voltage value, VmaxFor the voltage value of the output end of the inverter module, ImaxIt is described inverse
Become the current value of the output end of module, ω is high-power very low frequencies electric power output voltage angular frequency, Pin=VmaxImax/2；VdcFor
The voltage value of the output end of the filter module.
The derivation process of capacitor waveform control function is briefly described below:
When high-power very low frequencies power source loads are in tuning state, the voltage and current same-phase of capable AC side.Pole
Low-frequency power exchanges the expression formula such as formula (1) of the voltage and current of side:
Wherein, Vmax、ImaxRespectively exchange the voltage and current of side；Vmax、ImaxRespectively exchange side voltage magnitude and electricity
Flow amplitude；ω is high-power very low frequencies electric power output voltage angular frequency, and ω can be according to high-power very low frequencies electric power output voltage
Frequency f is obtained, high-power very low frequencies electric power output voltage frequency in 30HZ hereinafter, designed according to power supply design requirement, angle
Frequencies omega=2* π * f；T is the time.
The expression formula such as formula (2) of the instantaneous power of very low frequencies capable AC side:
Wherein, poFor the instantaneous power for exchanging side, namely the output (i in figure of entire power supplyLF) position instantaneous power.
As previously mentioned, subharmonic inhibits the capacitor C in device 105m1And Cm2Series connection and, C in parallel with direct current side busm1With
Cm2Capacitance it is equal, be Cm。vcm1、vcm2Respectively capacitor Cm1And Cm2Voltage.
Capacitor Cm1And Cm2Voltage vcm1、vcm2Expression formula such as formula (3):
Wherein, Vdc/ 2 be bias, Vcmsin(ωt+θm) it is waveform control function, meet Vcm≤Vdc/ 2, θmFor capacitor
Voltage vcm1With exchange side voltage voPhase difference.Wherein, phase difference θmFor π/4.
In order to which the instantaneous power for providing capacitor is equal with the high-power instantaneous ripple component of very low frequencies capable AC, the application
In capacitance voltage by Vdc/ 2 bias and waveform control function Vcmsin(ωt+θm) composition.Due to capacitor Cm1And Cm2Pole
Property on the contrary, so, capacitor Cm1And Cm2Between voltage difference vcm1+vcm2Namely the value of DC voltage, it is Vdc.Therefore this is set partially
Setting value not influences the value of DC voltage, while v in formula (3)cm1、vcm2Function waveform be it is the same, only phase is different, this
The comparison of coherence of the voltage of two capacitors of sample is good.
Waveform control function will not be embodied on DC voltage after capacitor series connection, and DC voltage is still Vdc。
Capacitor Cm1And Cm2Electric current expression formula such as formula (4):
Wherein, icm1For capacitor Cm1Electric current, icm2For capacitor Cm2Electric current.
Therefore, two capacitor Cm1And Cm2The expression formula of the instantaneous power of offer such as formula (5):
pCm=vcm1icm1+vcm2icm2=ω CmVcm 2sin(2ωt+2θm) (5)
Wherein, pCmFor two capacitor Cm1And Cm2The instantaneous power of offer.
By control waveform, instantaneous power p can be madeCmWith exchange side pulsating power ppulse(poSinusoidal part) phase
Deng capacitor waveform control function such as formula (6) is obtained by calculation:
Work as Vcm=VdcWhen/2, subharmonic inhibits device 105 to provide maximum pulsating power at this time, and capacitance is minimum
Value.Enabling pulsating power amplitude is Pin=VmaxImax/ 2, therefore, capacitor Cm1And Cm2Minimum capacity capacity CmAre as follows:
In embodiments of the present invention, the acquisition unit may include: current sensor, first voltage sensor, second
Voltage sensor and tertiary voltage sensor, the current sensor and first voltage sensor are defeated with the inverter module
Outlet electrical connection, the second voltage sensor are electrically connected with the output end of the filter module, the tertiary voltage sensor
It is electrically connected with the capacitor.
The high-power extremely low frequency power progress simulating, verifying for being 1Hz to working frequency obtains Fig. 3-waveform shown in Fig. 8.Its
In, Fig. 3-waveform shown in Fig. 8, which corresponds to parameter, may refer to Fig. 1, Fig. 2 and aforementioned formula part.
Wherein, Fig. 3 and Fig. 4 is the voltage current waveform that subharmonic is added and inhibits high-power extremely low frequency power before device, ginseng
See Fig. 3 and Fig. 4, before being added dc-link capacitance voltage there are apparent 2Hz low-frequency harmonics, in power network current except 50Hz fundamental wave and
5 times, other than 7 inferior harmonics, there are the lower sidebands such as 48Hz, 52Hz and 248Hz, 252Hz, 348Hz, 352Hz are humorous
Wave.Fig. 5 and Fig. 6 is the voltage current waveform that subharmonic is added and inhibits high-power extremely low frequency power after device, referring to figs. 5 and 6,
Subharmonic is substantially achieved complete inhibition after module is added, and power network current only contains except 50Hz fundamental wave and 5 times, 7 inferior features are secondary humorous
Wave.
Fig. 7 is the harmonic power waveform that subharmonic provided in an embodiment of the present invention inhibits device, wherein Ppulse、PdcAnd Pcm
Respectively exchange side pulsating power, filter module output end power and capacitor Cm1And Cm2Power, it can be seen that subharmonic
The instantaneous low frequency pulsating power compensation of the offer of device 105 exchange side pulsating power is provided, so that the output end of filter module
Power PdcWaveform is in a smooth state.Fig. 8 is the capacitance voltage waveform that subharmonic provided in an embodiment of the present invention inhibits device, and is set
Fixed capacitance voltage waveform control function is consistent.
Those of ordinary skill in the art will appreciate that realizing that all or part of the steps of above-described embodiment can pass through hardware
It completes, relevant hardware can also be instructed to complete by program, the program can store in a kind of computer-readable
In storage medium, storage medium mentioned above can be read-only memory, disk or CD etc..
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of subharmonic of high-power extremely low frequency power inhibits device, which is characterized in that described device include DC Module and
Control module；
The DC Module includes: two capacitors, two switching tubes and an inductance, described two capacitors and described two switches
Pipe is sequentially connected in series, and one end of the inductance is connected between described two capacitors, and the other end of the inductance is connected to described two
Between a switching tube, a capacitor and adjacent switching tube in described two capacitors is arranged in the input terminal of the DC Module
Between, the output end of the DC Module is arranged between another capacitor and adjacent switching tube in described two capacitors,
The input terminal and output end of the DC Module be connected to the filter module of the high-power extremely low frequency power two are defeated
Between outlet and two input terminals of inverter module；
The control module, for obtaining the current value and voltage value, the filter module of the output end of the inverter module
The voltage value of the voltage value of output end and the capacitor；According to the current value of the output end of the inverter module and voltage value,
The voltage value of the voltage value of the output end of the filter module and the capacitor controls the on-off of described two switching tubes, makes
The instantaneous power of capacitor is equal with the pulsating power of the output end of the inverter module in the DC Module.
2. the apparatus according to claim 1, which is characterized in that the control module includes:
Acquisition unit, the output of current value and voltage value, the filter module for acquiring the output end of the inverter module
The voltage value of the voltage value at end and the capacitor；
Control unit, for the output according to the current value and voltage value, the filter module of the output end of the inverter module
The voltage value and preset capacitor waveform control function of the voltage value at end, the capacitor generate capacitor waveform control signal；
Pulse-width modulator, for the capacitor waveform control signal to be converted into pulse control signal；
Driving unit, for controlling the switch of described two switching tubes using the pulse control signal.
3. the apparatus of claim 2, which is characterized in that described control unit, for according to the inverter module
The current value and voltage value of output end, the voltage value of the output end of the filter module and preset capacitor waveform control function
The first voltage value is calculated；
Half by the first voltage value plus the voltage value of the output end of the filter module obtains reference value；
The voltage value of the capacitor and the reference value are subjected to phase bit comparison, generate the capacitor waveform control signal.
4. device according to claim 3, which is characterized in that described control unit, for according to following capacitor waveform controls
Function processed calculates the first voltage value:
Wherein, VcmFor the first voltage value, VmaxFor the voltage value of the output end of the inverter module, ImaxFor the inversion mould
The current value of the output end of block, ω are high-power very low frequencies electric power output voltage angular frequency, Pin=VmaxImax/2；VdcIt is described
The voltage value of the output end of filter module.
5. the apparatus of claim 2, which is characterized in that the acquisition unit includes:
Current sensor, first voltage sensor, second voltage sensor and tertiary voltage sensor, the current sensor and
First voltage sensor is electrically connected with the output end of the inverter module, the second voltage sensor and the filter module
Output end electrical connection, the tertiary voltage sensor is electrically connected with the capacitor.
6. a kind of high-power extremely low frequency power, which is characterized in that the high-power extremely low frequency power includes sequentially connected rectification
Module, filter module and inverter module；
The high-power extremely low frequency power further includes that subharmonic inhibits device, and described device includes DC Module and control module；
The DC Module includes: two capacitors, two switching tubes and an inductance, described two capacitors and described two switches
Pipe is sequentially connected in series, and one end of the inductance is connected between described two capacitors, and the other end of the inductance is connected to described two
Between a switching tube, a capacitor and adjacent switching tube in described two capacitors is arranged in the input terminal of the DC Module
Between, the output end of the DC Module is arranged between another capacitor and adjacent switching tube in described two capacitors,
The input terminal and output end of the DC Module are connected to two output ends and the inverter module of the filter module
Two input terminals between；
The control module, for obtaining the current value and voltage value, the filter module of the output end of the inverter module
The voltage value of the voltage value of output end and the capacitor；According to the current value of the output end of the inverter module and voltage value,
The voltage value of the voltage value of the output end of the filter module and the capacitor controls the on-off of described two switching tubes, makes
The instantaneous power of capacitor is equal with the pulsating power of the output end of the inverter module in the DC Module.
7. high-power extremely low frequency power according to claim 6, which is characterized in that the control module includes:
Acquisition unit, the output of current value and voltage value, the filter module for acquiring the output end of the inverter module
The voltage value of the voltage value at end and the capacitor；
Control unit, for the output according to the current value and voltage value, the filter module of the output end of the inverter module
The voltage value and preset capacitor waveform control function of the voltage value at end, the capacitor generate capacitor waveform control signal；
Pulse-width modulator, for the capacitor waveform control signal to be converted into pulse control signal；
Driving unit, for controlling the switch of described two switching tubes using the pulse control signal.
8. high-power extremely low frequency power according to claim 7, which is characterized in that described control unit, for according to institute
State the output end of inverter module current value and voltage value, the filter module output end voltage value and preset capacitor
The first voltage value is calculated in waveform control function；
Half by the first voltage value plus the voltage value of the output end of the filter module obtains reference value；
The voltage value of the capacitor and the reference value are subjected to phase bit comparison, generate the capacitor waveform control signal.
9. high-power extremely low frequency power according to claim 8, which is characterized in that described control unit, under
It states capacitor waveform control function and calculates the first voltage value:
Wherein, VcmFor the first voltage value, VmaxFor the voltage value of the output end of the inverter module, ImaxFor the inversion mould
The current value of the output end of block, ω are high-power very low frequencies electric power output voltage angular frequency, Pin=VmaxImax/2；VdcIt is described
The voltage value of the output end of filter module.
10. high-power extremely low frequency power according to claim 7, which is characterized in that the acquisition unit includes:
Current sensor, first voltage sensor, second voltage sensor and tertiary voltage sensor, the current sensor and
First voltage sensor is electrically connected with the output end of the inverter module, the second voltage sensor and the filter module
Output end electrical connection, the tertiary voltage sensor is electrically connected with the capacitor.
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