CN109639124B - High-power extremely-low-frequency power supply and secondary harmonic suppression device - Google Patents
High-power extremely-low-frequency power supply and secondary harmonic suppression device Download PDFInfo
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- CN109639124B CN109639124B CN201811252121.XA CN201811252121A CN109639124B CN 109639124 B CN109639124 B CN 109639124B CN 201811252121 A CN201811252121 A CN 201811252121A CN 109639124 B CN109639124 B CN 109639124B
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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
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Abstract
The invention discloses a high-power extremely-low-frequency power supply and a subharmonic suppression device thereof, and belongs to the field of power supplies. The device comprises an energy storage circuit and a control module; the energy storage circuit comprises two capacitors, two switching tubes and an inductor, wherein the two capacitors are connected in series, the two switching tubes are connected in series, one end of the inductor is connected between the first ends of the two capacitors, the other end of the inductor is connected between the first ends of the two switching tubes, the second ends of the two capacitors are respectively connected with the two output ends of an inversion module of the high-power extremely-low frequency power supply, and the second ends of the two switching tubes are respectively connected between the two output ends of a filtering module of the high-power extremely-low frequency power supply and the two input ends of the inversion module; and the control module is used for controlling the on-off of the two switching tubes according to the current value and the voltage value of the output end of the inversion module, the voltage value of the output end of the filtering module and the voltage value of the capacitor, so that the instantaneous power of the capacitor in the energy storage circuit is equal to the pulsating power of the output end of the inversion module.
Description
Technical Field
The invention relates to the field of power supplies, in particular to a high-power extremely-low-frequency power supply and a subharmonic suppression device thereof.
Background
The Frequency range of Extremely Low Frequency (ELF) radio waves is below 30 Hz. The high-power extremely-low frequency power supply is equipment for manually generating an extremely-low frequency radio signal, and the power reaches hundreds of kilowatts.
The output of the inversion side of the high-power extremely-low frequency power supply is extremely-low frequency alternating current, and low-frequency harmonic components with 2 times of the working frequency of the power supply can be generated at the input end of the inversion side, so that the output harmonic characteristics of the extremely-low frequency power supply are deteriorated. Meanwhile, low-frequency harmonic components are transmitted to a rectifying side and a power grid side through a filter circuit, so that the inductive current at the rectifying output end fluctuates, and low-frequency sideband harmonic waves with twice low-frequency as intervals except fundamental waves and characteristic subharmonic waves are generated in the input current of the power grid. Because the low-frequency sideband harmonic wave does not fall on the integral multiple frequency of the working frequency of the power grid and appears in the form of subharmonic wave, the light flicker of a high-power extremely-low-frequency power supply can be caused, the harmonic loss of the system is increased, higher requirements on the voltage resistance and the insulation of devices are provided, and the reliability and the service life of the system are adversely affected. Even the resonance with the frequency of the generator shafting can occur, which causes the synchronous oscillation of the power system.
Disclosure of Invention
The embodiment of the invention provides a high-power extremely-low frequency power supply and a subharmonic suppression device thereof. The technical scheme is as follows:
on one hand, the embodiment of the invention provides a subharmonic suppression device of a high-power extremely-low-frequency power supply, which comprises an energy storage circuit and a control module;
the tank circuit includes: the two capacitors are connected in series, the two switch tubes are connected in series, one end of the inductor is connected between first ends of the two capacitors, the other end of the inductor is connected between first ends of the two switch tubes, second ends of the two capacitors are respectively connected with two output ends of an inversion module of the high-power extremely-low frequency power supply, and second ends of the two switch tubes are respectively connected with two input ends of the inversion module;
the control module is used for acquiring a current value and a voltage value of an output end of the inversion module, a voltage value of an output end of the filtering module and a voltage value of any one of the two capacitors; and controlling the on-off of the two switching tubes according to the current value and the voltage value of the output end of the inversion module, the voltage value of the output end of the filtering module of the high-power extremely-low frequency power supply and the voltage value of any one of the two capacitors, so that the instantaneous power of the capacitor in the energy storage circuit is equal to the pulsating power of the output end of the inversion module.
In an implementation manner of the embodiment of the present invention, the control module includes:
the acquisition unit is used for acquiring a current value and a voltage value of the output end of the inversion module, a voltage value of the output end of the filtering module and a voltage value of any one of the two capacitors;
the control unit is used for generating a capacitor waveform control signal according to the current value and the voltage value of the output end of the inversion module, the voltage value of the output end of the filtering module, the voltage value of any one of the two capacitors and a preset capacitor waveform control function;
a pulse width modulator for converting the capacitance waveform control signal into a pulse control signal;
and the driving unit is used for controlling the switching of the two switching tubes by adopting the pulse control signal.
In an implementation manner of the embodiment of the present invention, the control unit is configured to calculate to obtain a first voltage value according to a current value and a voltage value of an output end of the inversion module, a voltage value of an output end of the filtering module, and a preset capacitance waveform control function;
adding the first voltage value to a half of the voltage value of the output end of the filtering module to obtain a reference value;
and comparing the voltage value of any one of the two capacitors with the reference value in phase to generate the capacitor waveform control signal.
In an implementation manner of the embodiment of the present invention, the control unit is configured to calculate the first voltage value according to the following capacitance waveform control function:
wherein, VcmIs the first voltage value, VmaxIs the voltage value of the output end of the inversion module, ImaxIs the current value of the output end of the inversion module, CmIs the minimum capacitance capacity of any one of the two capacitors, and omega is the angular frequency of the output voltage of the high-power extremely-low frequency power supply, Pin＝VmaxImax/2；VdcThe voltage value is the voltage value of the output end of the filtering module.
In an implementation manner of the embodiment of the present invention, the acquisition unit includes:
the current sensor and the first voltage sensor are electrically connected with the output end of the inversion module, the second voltage sensor is electrically connected with the output end of the filtering module, and the third voltage sensor is electrically connected with any one of the two capacitors.
On the other hand, the embodiment of the invention provides a high-power extremely-low frequency power supply, which comprises a rectifying module, a filtering module and an inverting module which are sequentially connected;
the high-power extremely-low frequency power supply also comprises a subharmonic suppression device, wherein the subharmonic suppression device comprises an energy storage circuit and a control module;
the tank circuit includes: the two capacitors are connected in series, the two switch tubes are connected in series, one end of the inductor is connected between first ends of the two capacitors, the other end of the inductor is connected between first ends of the two switch tubes, second ends of the two capacitors are respectively connected with two output ends of an inversion module of the high-power extremely-low frequency power supply, and second ends of the two switch tubes are respectively connected with two input ends of the inversion module;
the control module is used for acquiring a current value and a voltage value of an output end of the inversion module, a voltage value of an output end of the filtering module and a voltage value of any one of the two capacitors; and controlling the on-off of the two switching tubes according to the current value and the voltage value of the output end of the inversion module, the voltage value of the output end of the filtering module and the voltage value of any one of the two capacitors, so that the instantaneous power of the capacitor in the energy storage circuit is equal to the pulsating power of the output end of the inversion module.
In an implementation manner of the embodiment of the present invention, the control module includes:
the acquisition unit is used for acquiring a current value and a voltage value of the output end of the inversion module, a voltage value of the output end of the filtering module and a voltage value of any one of the two capacitors;
the control unit is used for generating a capacitor waveform control signal according to the current value and the voltage value of the output end of the inversion module, the voltage value of the output end of the filtering module, the voltage value of any one of the two capacitors and a preset capacitor waveform control function;
a pulse width modulator for converting the capacitance waveform control signal into a pulse control signal;
and the driving unit is used for controlling the switching of the two switching tubes by adopting the pulse control signal.
In an implementation manner of the embodiment of the present invention, the control unit is configured to calculate to obtain a first voltage value according to a current value and a voltage value of an output end of the inversion module, a voltage value of an output end of the filtering module, and a preset capacitance waveform control function;
adding the first voltage value to a half of the voltage value of the output end of the filtering module to obtain a reference value;
and comparing the voltage value of any one of the two capacitors with the reference value in phase to generate the capacitor waveform control signal.
In an implementation manner of the embodiment of the present invention, the control unit is configured to calculate the first voltage value according to the following capacitance waveform control function:
wherein, VcmIs the first voltage value, VmaxIs the voltage value of the output end of the inversion module, ImaxIs the current value of the output end of the inversion module, CmIs the minimum capacitance capacity of any one of the two capacitors, and omega is the angular frequency of the output voltage of the high-power extremely-low frequency power supply, Pin＝VmaxImax/2；VdcThe voltage value is the voltage value of the output end of the filtering module.
In an implementation manner of the embodiment of the present invention, the acquisition unit includes:
the current sensor and the first voltage sensor are electrically connected with the output end of the inversion module, the second voltage sensor is electrically connected with the output end of the filtering module, and the third voltage sensor is electrically connected with any one of the two capacitors.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
in the subharmonic suppression device according to the embodiment of the present invention, two switching tubes are connected in parallel between two output ends of the filtering module and two input ends of the inverting module, that is, the two switching tubes are connected in parallel on the dc bus, a midpoint of the two switching tubes is equivalent to an output end of the half-bridge circuit and is connected to a midpoint of the two capacitors, and a midpoint voltage of the two capacitors can be controlled by controlling switches of the switching tubes. When the ripple component in the capacitor instantaneous power is equal to the instantaneous ripple power component on the inverted alternating current side, the output current of the subharmonic suppression device can compensate the direct current low-frequency harmonic current so as to suppress the generation of the inter-grid harmonic. The problem of subharmonic of the high-power extremely-low frequency power supply is solved, safe and stable operation of the high-power extremely-low frequency power supply is guaranteed, and the quality of electric energy is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a circuit diagram of a high power very low frequency power supply according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a subharmonic suppression apparatus for a high power very low frequency power supply according to an embodiment of the present invention;
FIGS. 3 and 4 are voltage and current waveforms of a high power very low frequency power supply before a subharmonic suppression device is added;
FIGS. 5 and 6 are voltage and current waveforms of a high power very low frequency power supply incorporating a subharmonic suppression device;
fig. 7 is a waveform of a capacitor voltage of the subharmonic suppression apparatus according to the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Fig. 1 is a circuit diagram of a high-power very-low-frequency power supply according to an embodiment of the present invention. Referring to fig. 1, the high-power very low frequency power supply includes a rectification module 101, a filtering module 102 and an inversion module 103, which are connected in sequence.
As shown in fig. 1, the rectification module 101 is a three-phase controllable rectification circuit using thyristors. The rectifier module 101 adopts a double-LC filter circuit, thereby stabilizing the output ripple voltage of the rectifier circuit. The inverter module 103 is a single-phase bridge inverter circuit.
Furthermore, the high-power extremely-low frequency power supply is configured with the number of power supply units according to power requirements, each power supply unit comprises the rectifying module 101, the filtering module 102 and the inverting module 103, and the power supply units are directly connected at the inverting output end to form a cascaded multi-level inverting circuit. The input end of the power supply unit is connected with the phase-shifting transformer 104 to form a multi-pulse rectification circuit, so that a plurality of independent direct current sources are provided for the multilevel inverter circuit, and the power quality of the power grid side is improved. The multi-pulse rectification circuit can be regarded as a direct current power supply, and a plurality of power supply units are connected behind the direct current power supply. The alternating current of the power grid is connected with a phase-shifting transformer and then connected with a multi-pulse rectification circuit, so that the alternating current is changed into direct current with small amplitude oscillation. The multi-pulse rectification circuit has the function of mutually offsetting third harmonic components in harmonic waves generated by the plurality of inverter circuits at the phase-shifting transformer, the third harmonic greatly affects a power grid, and the power quality of the power grid can be improved after the third harmonic is reduced.
Specifically, the input end of the phase-shifting transformer 104 is a three-phase alternating current U output by the power gridsThe current of the three-phase alternating current is isThe transmission of power from the grid to the phase-shifting transformer 104 is over a long conductor having an impedance Z in the figures1。
Fig. 2 is a schematic structural diagram of a subharmonic suppression apparatus of a high-power very-low frequency power supply according to an embodiment of the present invention. As shown in fig. 2, when the high power very low frequency power supply includes only one power supply unit, the phase-shifting transformer 104 is not required.
Referring to fig. 1 and 2, the high power very low frequency power supply further comprises a subharmonic suppression device 105. The number of subharmonic suppression devices 105 is 1 regardless of the number of power supply units.
Referring to fig. 1, the subharmonic suppression device 105 is placed on the dc side of the power supply unit of the high-power very-low frequency power supply, is connected in parallel with the dc bus, and is equivalent to a harmonic generation source, tracks the subharmonic component on the dc side, generates a compensation current with the same amplitude and the opposite direction, cancels the harmonic current generated by the low-frequency inverter side, makes the current on the dc side tend to dc, and prevents the low-frequency current from being transmitted to the rectifier side and the network side, thereby achieving the purpose of suppressing the network-side subharmonic. The dc bus is a dc portion of the ac power of the power grid after passing through the multi-pulse rectification circuit, and in this embodiment, refers to an input side of the inverter module 103, which is u in fig. 1 and 2dAt both ends of the same.
Referring to fig. 2, the subharmonic suppression device 105 includes a tank circuit 151 and a control module 152.
The tank circuit 151 includes: two capacitors Cm1And Cm2Two switching tubes T5And T6And an inductor LfSaid two capacitors Cm1And Cm2In series, the two switching tubes T5And T6In series, the inductance LfIs connected to the two capacitors Cm1And Cm2Between, the inductance LfIs connected to the two switching tubes T at the other end5And T6In the meantime. Wherein, the capacitor Cm1And Cm2Are identical capacitors, switching tubes T5And T6The same switching tube.
In this embodiment, the inductance LfIs connected to the two capacitors Cm1And Cm2Between the first terminals of said inductor LfIs connected to the two switching tubes T at the other end5And T6Between the first terminals of the two capacitors Cm1And Cm2Is respectively connected with two output ends of the inversion module 103 of the high-power extremely-low frequency power supplyThe two switching tubes T5And T6And the second ends of the two terminals are respectively connected with the two input ends of the inversion module 103. As shown in fig. 2, the inverter module 103 is a bridge structure, and one output end thereof is located at the switch tube T1And a switching tube T2The other output end is positioned at the switch tube T3And a switching tube T4To (c) to (d); one input end of the inversion module 103 is positioned at the switch tube T1And a switching tube T3The other input end is positioned in the switch tube T2And a switching tube T4In the meantime. Two output ends of the filtering module 102 are respectively a capacitor C2At both ends of the same.
As shown in fig. 2, wherein, the switch tube T5The first end of the anode is a positive electrode, and the second end of the anode is a negative electrode; switch tube T6The first terminal of (a) is a negative electrode and the second terminal is a positive electrode. When there are a plurality of power modules, two switching tubes T are shown in fig. 15And T6The second ends of the two power modules are respectively connected between the output ends of the filtering modules 102 and the input ends of the inversion modules 103 of the two power modules at the two most sides, wherein the output ends of the inversion modules 103 of the two power modules at the most two most sides form the output end of the high-power extremely-low-frequency power supply.
The control module 152 is configured to obtain a current value and a voltage value of the output end of the inverter module 103, a voltage value of the output end of the filter module 102, and the capacitor Cm1Or Cm2Voltage value of (d); according to the current value and the voltage value of the output end of the inversion module 103, the voltage value of the output end of the filtering module 102 and the capacitor Cm1Or Cm2Voltage value of, controlling the two switching tubes T5And T6Make and break of the capacitor C in the energy storage circuit 151m1And Cm2Is equal to the ripple power at the output of the inverter module 103.
In the subharmonic suppression device 105 of the embodiment of the present invention, two switching tubes T5And T6Between two output terminals of the parallel filter module 102 and two input terminals of the inverter module 103, i.e. two switching tubes T5And T6Connected in parallel on a DC bus, the middle point of the two switching tubes is equivalent to halfBridge circuit output terminal, and two capacitors Cm1And Cm2Is connected by controlling the switch tube T5And T6The switch can control two capacitors Cm1And Cm2The midpoint voltage of (a). When the capacitance Cm1And Cm2When the ripple component in the instantaneous power is equal to the instantaneous ripple power component on the inverted ac side, the subharmonic suppression device 105 outputs a current to compensate the dc low-frequency harmonic current, so as to suppress the generation of inter-grid harmonics. The problem of subharmonic of the high-power extremely-low frequency power supply is solved, safe and stable operation of the high-power extremely-low frequency power supply is guaranteed, and the quality of electric energy is improved.
Referring to fig. 2, the control module 152 may include:
a collecting unit (not shown in the figure) for collecting a current value and a voltage value of an output end of the inversion module, a voltage value of an output end of the filtering module, and a voltage value of any one of the two capacitors;
a control unit 1521, configured to generate a capacitor waveform control signal according to the current value and the voltage value at the output end of the inverter module, the voltage value at the output end of the filter module, the voltage value of any one of the two capacitors, and a preset capacitor waveform control function;
a pulse width modulator 1522 for converting the capacitance waveform control signal into a pulse control signal;
and a driving unit 1523, configured to control the switching of the two switching tubes by using the pulse control signal.
In this implementation manner, the control unit 1521 is configured to calculate a first voltage value according to a current value and a voltage value of an output end of the inverter module, a voltage value of an output end of the filter module, and a preset capacitance waveform control function;
adding the first voltage value to a half of the voltage value of the output end of the filtering module to obtain a reference value;
and comparing the voltage value of any one of the two capacitors with the reference value in phase to generate the capacitor waveform control signal.
In this implementation, the control unit 1521 is configured to calculate the first voltage value according to the following capacitance waveform control function:
wherein, VcmIs the first voltage value, VmaxIs the voltage value of the output end of the inversion module, ImaxThe current value of the output end of the inversion module is omega which is the angular frequency of the output voltage of the high-power extremely-low frequency power supply, Pin＝VmaxImax/2；VdcThe voltage value is the voltage value of the output end of the filtering module.
The derivation of the capacitance waveform control function is briefly described as follows:
when the high-power extremely-low-frequency power supply load is in a tuning state, the voltage and the current on the alternating current side of the power supply are in the same phase. The expressions of the voltage and the current on the alternating current side of the extremely low frequency power supply are shown as formula (1):
wherein, Vmax、ImaxVoltage and current on the ac side, respectively; vmax、ImaxThe amplitude of the voltage and the amplitude of the current on the alternating current side are respectively; omega is the angular frequency of the output voltage of the high-power extremely-low frequency power supply, omega can be obtained according to the frequency f of the output voltage of the high-power extremely-low frequency power supply, the frequency of the output voltage of the high-power extremely-low frequency power supply is below 30HZ and is designed according to the design requirement of the power supply, and the angular frequency omega is 2 pi f; t is time.
The expression of the instantaneous power on the AC side of the very low frequency power supply is shown as formula (2):
wherein p isoIs instantaneous power at the AC side, i.e. the output of the whole power supply (i in the figure)LF) The instantaneous power of the location of (a).
As previously mentioned, the capacitance C in the subharmonic suppression device 105m1And Cm2In series and in parallel with the AC output side, Cm1And Cm2Are equal in capacitance value of Cm。vcm1、vcm2Are respectively a capacitor Cm1And Cm2The voltage of (c).
Capacitor Cm1And Cm2Voltage v ofcm1、vcm2Is expressed as formula (3):
wherein, Vmaxsin (ω t)/2 is an offset value, Vcmsin(ωt+θm) Is a waveform control function, satisfies Vcm≤Vdc/2，θmIs a capacitor voltage vcm1And a voltage v on the AC sideoThe phase difference of (1). Wherein the phase difference thetamIs composed of
In order to make the instantaneous power provided by the capacitor equal to the AC instantaneous pulsating component of the high-power extremely-low frequency power supply, the voltage of the capacitor in the application is VdcBias value and waveform control function V of/2cmsin(ωt+θm) And (4) forming. Due to the capacitance Cm1And Cm2Are opposite in polarity, so that the capacitor Cm1And Cm2Voltage difference v betweencm1+vcm2I.e. the value of the DC voltage, is Vmaxsin (ω t). Therefore, the offset value is set not to affect the value of the DC voltage, and v in the formula (3)cm1、vcm2The waveforms of the functions of (1) are the same, but the phases are different, so that the voltage consistency of the two capacitors is better.
After the capacitors are connected in series, the waveform control function can not be reflected on the AC side voltage which is still Vdc。
Capacitor Cm1And Cm2Is expressed as formula (4):
wherein icm1Is a capacitor Cm1Current of (i)cm2Is a capacitor Cm2The current of (2).
Thus, two capacitors Cm1And Cm2The expression of the instantaneous power provided is as in equation (5):
wherein p isCmIs two capacitors Cm1And Cm2Instantaneous power supplied.
By controlling the voltage waveform, the instantaneous power p can be madeCmAnd the ac side pulsating power ppulse(poSinusoidal portion of (c) and the capacitance waveform control function is calculated as in equation (6):
when V iscm＝VdcAt time/2, the subharmonic suppression device 105 provides the maximum pulsating power, and the capacitance is at the minimum. Make the amplitude of the pulse power be Pin＝VmaxImax/2, therefore, the capacitance Cm1And Cm2Minimum capacitance C ofmComprises the following steps:
in an embodiment of the present invention, the acquisition unit may include: the current sensor and the first voltage sensor are electrically connected with the output end of the inversion module, the second voltage sensor is electrically connected with the output end of the filtering module, and the third voltage sensor is electrically connected with any one of the two capacitors.
The waveforms shown in fig. 3-7 are obtained by performing simulation verification on a high-power extremely-low-frequency power supply with the working frequency of 1 Hz. The waveform corresponding parameters shown in fig. 3-7 can be referred to in fig. 1, fig. 2 and the formula part.
Fig. 3 and 4 show voltage and current waveforms of a high-power extremely-low-frequency power supply before a subharmonic suppression device is added, referring to fig. 3 and 4, obvious 2Hz low-frequency harmonic exists when the voltage of a front direct-current bus capacitor is added, and low-frequency side band harmonics such as 48Hz, 52Hz, 248Hz, 252Hz, 348Hz, 352Hz and the like exist in grid current besides 50Hz fundamental wave and characteristic subharmonics such as 5 th order, 7 th order and the like. Fig. 5 and 6 show the voltage and current waveforms of the high-power extremely-low-frequency power supply after the subharmonic suppression device is added, referring to fig. 5 and 6, the subharmonic is basically and completely suppressed after the subharmonic suppression device is added, and the power grid current only contains the characteristic subharmonic except for 50Hz fundamental wave and 5 th order and 7 th order.
Fig. 7 is a harmonic power waveform of the subharmonic suppression device provided in the embodiment of the present invention, and it can be seen that the instantaneous low-frequency ripple power provided by the subharmonic suppression device 105 compensates the ac-side ripple power, and does not affect the ac output of the high-power low-frequency power supply.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A subharmonic suppression device of a high-power extremely-low-frequency power supply is characterized by comprising an energy storage circuit and a control module;
the tank circuit includes: the circuit comprises two capacitors, two switching tubes and an inductor, wherein the two capacitors are connected in series, and the connection point of the two capacitors in series is the first end of the two capacitors; the two switching tubes are connected in series, and the connection point of the two switching tubes in series is the first end of the two switching tubes; one end of the inductor is connected between the first ends of the two capacitors, the other end of the inductor is connected between the first ends of the two switching tubes, the second ends of the two capacitors are respectively connected with the two output ends of the inversion module of the high-power extremely-low frequency power supply, and the second ends of the two switching tubes are respectively connected with the two input ends of the inversion module;
the control module is used for acquiring a current value and a voltage value of an output end of the inversion module, a voltage value of an output end of a filtering module of the high-power extremely-low frequency power supply and a voltage value of any one of the two capacitors; and controlling the on-off of the two switching tubes according to the current value and the voltage value of the output end of the inversion module, the voltage value of the output end of the filtering module and the voltage value of any one of the two capacitors, so that the instantaneous power of the capacitor in the energy storage circuit is equal to the pulsating power of the output end of the inversion module.
2. The apparatus of claim 1, wherein the control module comprises:
the acquisition unit is used for acquiring a current value and a voltage value of the output end of the inversion module, a voltage value of the output end of the filtering module and a voltage value of any one of the two capacitors;
the control unit is used for generating a capacitor waveform control signal according to the current value and the voltage value of the output end of the inversion module, the voltage value of the output end of the filtering module, the voltage value of any one of the two capacitors and a preset capacitor waveform control function;
a pulse width modulator for converting the capacitance waveform control signal into a pulse control signal;
and the driving unit is used for controlling the switching of the two switching tubes by adopting the pulse control signal.
3. The apparatus according to claim 2, wherein the control unit is configured to calculate a first voltage value according to the current value and the voltage value at the output end of the inverting module, the voltage value at the output end of the filtering module, and a preset capacitance waveform control function;
adding the first voltage value to a half of the voltage value of the output end of the filtering module to obtain a reference value;
and comparing the voltage value of any one of the two capacitors with the reference value in phase to generate the capacitor waveform control signal.
4. The apparatus of claim 3, wherein the control unit is configured to calculate the first voltage value according to the following capacitance waveform control function:
wherein, VcmIs the first voltage value, VmaxIs the voltage value of the output end of the inversion module, ImaxIs the current value of the output end of the inversion module, CmIs the minimum capacitance capacity of any one of the two capacitors, and omega is the angular frequency of the output voltage of the high-power extremely-low frequency power supply, Pin＝VmaxImax/2；VdcThe voltage value is the voltage value of the output end of the filtering module.
5. The apparatus of claim 2, wherein the acquisition unit comprises:
the current sensor and the first voltage sensor are electrically connected with the output end of the inversion module, the second voltage sensor is electrically connected with the output end of the filtering module, and the third voltage sensor is electrically connected with any one of the two capacitors.
6. A high-power extremely low frequency power supply is characterized in that the high-power extremely low frequency power supply comprises a rectifying module, a filtering module and an inverting module which are connected in sequence;
the high-power extremely-low frequency power supply also comprises a subharmonic suppression device, wherein the subharmonic suppression device comprises an energy storage circuit and a control module;
the tank circuit includes: the circuit comprises two capacitors, two switching tubes and an inductor, wherein the two capacitors are connected in series, and the connection point of the two capacitors in series is the first end of the two capacitors; the two switching tubes are connected in series, and the connection point of the two switching tubes in series is the first end of the two switching tubes; one end of the inductor is connected between the first ends of the two capacitors, the other end of the inductor is connected between the first ends of the two switching tubes, the second ends of the two capacitors are respectively connected with the two output ends of the inversion module of the high-power extremely-low frequency power supply, and the second ends of the two switching tubes are respectively connected with the two input ends of the inversion module;
the control module is used for acquiring a current value and a voltage value of an output end of the inversion module, a voltage value of an output end of the filtering module and a voltage value of any one of the two capacitors; and controlling the on-off of the two switching tubes according to the current value and the voltage value of the output end of the inversion module, the voltage value of the output end of the filtering module and the voltage value of any one of the two capacitors, so that the instantaneous power of the capacitor in the energy storage circuit is equal to the pulsating power of the output end of the inversion module.
7. The high power very low frequency power supply of claim 6, wherein said control module comprises:
the acquisition unit is used for acquiring a current value and a voltage value of the output end of the inversion module, a voltage value of the output end of the filtering module and a voltage value of any one of the two capacitors;
the control unit is used for generating a capacitor waveform control signal according to the current value and the voltage value of the output end of the inversion module, the voltage value of the output end of the filtering module, the voltage value of any one of the two capacitors and a preset capacitor waveform control function;
a pulse width modulator for converting the capacitance waveform control signal into a pulse control signal;
and the driving unit is used for controlling the switching of the two switching tubes by adopting the pulse control signal.
8. The high-power extremely low-frequency power supply according to claim 7, wherein the control unit is configured to calculate a first voltage value according to a current value and a voltage value at an output end of the inverter module, a voltage value at an output end of the filter module, and a preset capacitance waveform control function;
adding the first voltage value to a half of the voltage value of the output end of the filtering module to obtain a reference value;
and comparing the voltage value of any one of the two capacitors with the reference value in phase to generate the capacitor waveform control signal.
9. The high power very low frequency power supply according to claim 8, wherein said control unit is configured to calculate said first voltage value according to the following capacitance waveform control function:
wherein, VcmIs the first voltage value, VmaxIs the voltage value of the output end of the inversion module, ImaxIs the current value of the output end of the inversion module, CmIs the minimum capacitance capacity of any one of the two capacitors, and omega is the angular frequency of the output voltage of the high-power extremely-low frequency power supply, Pin＝VmaxImax/2；VdcThe voltage value is the voltage value of the output end of the filtering module.
10. The high power very low frequency power supply of claim 7, wherein said pickup unit comprises:
the current sensor and the first voltage sensor are electrically connected with the output end of the inversion module, the second voltage sensor is electrically connected with the output end of the filtering module, and the third voltage sensor is electrically connected with any one of the two capacitors.
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| JPH10271831A (en) * | 1997-03-26 | 1998-10-09 | Matsushita Electric Works Ltd | Power supply unit |
| CN1841904A (en) * | 2005-04-01 | 2006-10-04 | 吴炎喜 | Method for shutting thyratron transistor and its thyratron transistor high-pressure frequency converter |
| JP2008295161A (en) * | 2007-05-23 | 2008-12-04 | Daikin Ind Ltd | Power conversion device |
| CN104022510B (en) * | 2014-05-27 | 2016-06-01 | 桂林电子科技大学 | Quick and precisely detect the quality of power supply control method of instruction signal |
| CN104506026B (en) * | 2015-01-04 | 2018-06-05 | 华为技术有限公司 | A kind of active filter and communication system |
| CN106532706A (en) * | 2016-12-22 | 2017-03-22 | 南京因泰莱电器股份有限公司 | Tracking differentiator-based active filter space vector current control method |
| CN207339643U (en) * | 2017-06-16 | 2018-05-08 | 西安因变光电科技有限公司 | One kind is without high-power factor compensation circuit in PFC |
| CN107395043A (en) * | 2017-08-22 | 2017-11-24 | 哈尔滨工业大学深圳研究生院 | A kind of series parallel resonance inverter circuit for thering is second harmonic to suppress branch road |
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