CN111106745B - Variable frequency control circuit for power conversion circuit and power generation system of magnetic-levitation train - Google Patents

Variable frequency control circuit for power conversion circuit and power generation system of magnetic-levitation train Download PDF

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Publication number
CN111106745B
CN111106745B CN201811251842.9A CN201811251842A CN111106745B CN 111106745 B CN111106745 B CN 111106745B CN 201811251842 A CN201811251842 A CN 201811251842A CN 111106745 B CN111106745 B CN 111106745B
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frequency
control circuit
voltage
input
current
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CN111106745A (en
Inventor
陈修林
王三虎
张顺彪
王富光
胡丹华
谭红林
罗慧
曾理
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CRRC Zhuzhou Institute Co Ltd
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CRRC Zhuzhou Institute Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208—Arrangements for improving power factor of AC input
    • 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
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/14—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from dynamo-electric generators driven at varying speed, e.g. on vehicle
    • 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
    • H02P9/14—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
    • Y02T10/92—Energy efficient charging or discharging systems for batteries, ultracapacitors, supercapacitors or double-layer capacitors specially adapted for vehicles

Abstract

The invention provides a frequency conversion control circuit for a power conversion circuit, which comprises a single-period control circuit and a frequency conversion circuit, wherein the single-period control circuit outputs a driving signal for switching on or off a switch unit in the power conversion circuit according to input current and output voltage acquired by the power conversion circuit from an alternating current power supply, so that the phase difference of the input current relative to the input voltage is adjusted by adjusting the switching-on or switching-off time of the switch unit, and the power factor adjustment is realized; and the frequency conversion circuit converts the input current regulated by the single-period control circuit and then transmits the converted input current to the clock input end of the single-period control circuit, so that the clock input frequency of the single-period control circuit is in direct proportion to the frequency of the input current, and the frequency conversion control is realized along with the change of the input current. The invention also provides a power generation system of the magnetic-levitation train adopting the variable-frequency control circuit.

Description

Variable frequency control circuit for power conversion circuit and power generation system of magnetic-levitation train
Technical Field
The invention relates to output power conversion of a linear generator, in particular to frequency conversion control of a linear motor induction generator of a high-speed maglev train.
Background
The electric energy of electric equipment (such as a suspension system, an air conditioner or a lighting device) on a normally-conducting magnetic-levitation train is provided by a linear generator and a vehicle-mounted storage battery which are combined in a suspension magnet of the train. In order to ensure the long-time normal work of the train, the linear generator on the magnetic-levitation train must timely charge the storage battery. Because the alternating current electromotive force induced on the linear generator coil is related to the running speed of the train, when the train is in a low-speed state, the electric energy generated by the original linear generator on the train cannot meet the requirement of sufficient power supply of the vehicle-mounted storage battery, and thus when the energy consumption of the vehicle-mounted storage battery is finished, the maglev train can be stopped. Therefore, it is important to meet the electric energy demand of the electric equipment on the train by using the linear generator at the lower train speed as much as possible.
In order to obtain more power from the generator, the active power of the power conversion circuit of the linear generator should be increased as much as possible, i.e. the power factor is increased.
The traditional active power factor correction circuit with the multiplier needs to detect the input voltage and the input current of the power conversion circuit of the linear generator, and in practical application, the winding inductance of the generator is used as a boosting inductance, and a voltage signal on the winding of the generator is not easy to obtain, so that the traditional power factor correction control technology with the multiplier is difficult to adopt.
Disclosure of Invention
To solve the above technical problems, a first aspect of the present invention provides a frequency conversion control circuit for a power conversion circuit, the power conversion circuit being connected to an ac power supply for converting an input current and an input voltage obtained from the ac power supply into an output current and an output voltage, the power conversion circuit having a switching unit, the frequency conversion control circuit including a one-cycle control circuit and a frequency conversion circuit, wherein the one-cycle control circuit outputs a drive signal for turning on or off the switching unit in accordance with the input current and the output voltage, so that a phase difference of the input current with respect to the input voltage is adjusted by adjusting an on or off time of the switching unit; and the frequency conversion circuit converts the input current regulated by the single-period control circuit and then transmits the converted input current to the clock input end of the single-period control circuit, so that the clock input frequency of the single-period control circuit is in direct proportion to the frequency of the input current.
Preferably, the frequency conversion circuit has a frequency-to-voltage converter and a voltage-to-frequency converter, and the input current is supplied to the clock input terminal after passing through the frequency-to-voltage converter and the voltage-to-frequency converter in this order.
Preferably, the frequency translation circuit further comprises a limiting circuit connected between the output of the voltage to frequency converter and the clock input to limit the clock input frequency to a specific range.
Preferably, the single-period control circuit is a single-period control circuit in a leading edge mode or a single-period control circuit in a trailing edge mode.
Preferably, the ac power source is a linear induction generator of a magnetic levitation train, the linear induction generator comprising a generating winding, wherein electric energy having an induced current and an induced voltage is generated in the generating winding as the magnetic levitation train travels.
Preferably, the induced current and the induced voltage are supplied to the power conversion circuit as an input current and an input voltage, the magnitude and frequency of which can be proportional to the traveling speed of the magnetic levitation train.
The second aspect of the present invention provides a power generation system of a magnetic-levitation train, comprising a linear induction generator, a power conversion circuit and a frequency conversion control circuit, wherein: the linear induction generator comprises a power generation winding, and electric energy with induced current and induced voltage is generated in the power generation winding along with the advancing of the magnetic suspension train; the power conversion circuit is connected to the linear induction generator to obtain an induced current and an induced voltage from the linear induction generator as an input current and an input voltage and convert the input current and the input voltage into an output current and an output voltage, and the power conversion circuit is provided with a switching unit; the frequency conversion control circuit comprises a single-period control circuit and a frequency conversion circuit, wherein the single-period control circuit outputs a driving signal for turning on or off the switching unit according to the input current and the output voltage, so that the phase difference of the input current relative to the input voltage is adjusted by adjusting the on or off time of the switching unit; and the frequency conversion circuit converts the input current regulated by the single-period control circuit and then transmits the converted input current to the clock input end of the single-period control circuit, so that the clock input frequency of the single-period control circuit is in direct proportion to the frequency of the input current.
Preferably, the frequency conversion circuit has a frequency-to-voltage converter and a voltage-to-frequency converter, and the input current is supplied to the clock input terminal after passing through the frequency-to-voltage converter and the voltage-to-frequency converter in this order.
Preferably, the frequency translation circuit further comprises a limiting circuit connected between the output of the voltage to frequency converter and the clock input to limit the clock input frequency to a specific range.
Preferably, the input current and input voltage can have amplitudes and frequencies that are proportional to the travel speed of the magnetic levitation train, such that the clock input frequency of the single-cycle control circuit is proportional to the travel speed of the magnetic levitation train.
The invention adopts the single-cycle control technology to carry out PWM control, and realizes a variable frequency control method based on the train speed on the basis, so that the linear generator winding can output larger current when the maglev train runs at low speed, the power output capability of the linear generator is improved, and the power requirement of electric equipment of the train is met under the condition of lower train running speed.
Compared with the prior art, the invention has the following advantages:
1) in the invention, the frequency of the inductive current can be converted and then used as the clock input of the single-period control circuit by combining the single-period control circuit and the frequency conversion circuit, thus realizing the frequency conversion control based on the OCC; the power factor of the linear generator can be improved, and the output power of the linear generator can be improved when the maglev train runs at low speed;
2) the frequency of the inductive current is detected by the frequency-voltage converter and converted into voltage to obtain the speed information of the magnetic-levitation train, so that the speed information of the magnetic-levitation train is suitable for the structural characteristics of the linear generator of the magnetic-levitation train, the wiring requirement is reduced, and the realization difficulty is reduced;
3) the frequency conversion is simply realized through a frequency-to-voltage and voltage-to-frequency circuit, any frequency multiplication can be easily realized, and the selection of a proper switching frequency band is facilitated;
4) the frequency range is limited by the amplitude limiting circuit, so that the conversion circuit can be ensured to work in a controllable range.
Drawings
The foregoing summary, as well as the following detailed description of the invention, will be better understood when read in conjunction with the appended drawings. It is to be noted that the appended drawings are intended as examples of the claimed invention. In the drawings, like reference characters designate the same or similar elements.
Fig. 1 shows a schematic diagram of a power conversion circuit of a linear generator using the variable frequency control circuit of the present invention.
Fig. 2 shows a first embodiment of the variable frequency control circuit based on the single period control technique according to the first aspect of the present invention.
Fig. 3 shows a second embodiment of the variable frequency control circuit based on the single period control technique according to the first aspect of the present invention.
Figure 4 shows a schematic view of a linear induction generator of the power generation system of a magnetic levitation train of the second aspect of the present invention.
Figure 5 shows a schematic diagram of a power generation system of a magnetic levitation train of a second aspect of the present invention.
Detailed Description
The detailed features and advantages of the present invention are described in detail in the detailed description which follows, and will be sufficient for anyone skilled in the art to understand the technical content of the present invention and to implement the present invention, and the related objects and advantages of the present invention will be easily understood by those skilled in the art from the description, claims and drawings disclosed in the present specification.
Fig. 1 shows a power conversion circuit 2, which may be any power conversion circuit in the prior art, such as a boost chopper circuit, as shown in fig. 2. The power conversion circuit 2 includes a rectifying unit 21 and a chopper unit 22, and the chopper unit 22 includes a switching tube S, a rectifying diode D, and a smoothing capacitor C. Here, the power conversion circuit 2 is connected to an alternating-current power supply 3, acquires an input current and an input voltage from the alternating-current power supply 3, and converts the input current and the input voltage into an output current and an output voltage to supply to a load, such as an in-vehicle electric device. The switching tube S is an example of a switching unit according to the invention.
The specific configuration of the frequency conversion control circuit 1 for the above-described power conversion circuit 2 of the present invention will be described in detail below with reference to fig. 2 and 3. Fig. 2 shows a first embodiment of the variable frequency control circuit based on the single-cycle control technique according to the first aspect of the present invention, wherein the single-cycle control circuit 20 is a single-cycle control circuit in a leading-edge adjustment mode. Fig. 3 shows a second embodiment of the variable frequency control circuit based on the single-cycle control technique according to the first aspect of the present invention, wherein the single-cycle control circuit 20 is a single-cycle control circuit in a trailing-edge adjustment mode.
First embodiment of first aspect of the invention
Referring to fig. 2, the frequency conversion control circuit 1 includes a one-cycle control circuit 20 and a frequency conversion circuit 10.
Monocycle control circuit 20
The one-cycle control circuit 20 includes a PI regulator unit 21, a switching integrator unit 22, a comparator unit 23, an RS flip-flop unit 24, and an inverter unit 25, which are connected in this order.
The PI regulator unit 21 includes a PI regulation comparator 211 and a feedback circuit 212, wherein one input terminal of the PI regulation comparator 211 is connected to the output voltage Vout of the corresponding power conversion circuit 2, and the other input terminal is connected to the reference voltage value Vref. The output terminal of the PI regulation comparator 211 is connected to the input terminal of the PI regulation comparator 211 via the feedback circuit 212, and the difference between the reference voltage value Vref and the output voltage Vout is used as the input of the PI regulation comparator 211, i.e., dynamically regulated according to the output voltage Vout of the power conversion circuit 2.
The switched integrator unit 22 includes an integrating capacitor 221, a reset switch 222, and a switched integration comparator 223. The output end of the switched integral comparator 223, one end of the integrating capacitor 221 and one end of the reset switch 222 are respectively connected to the input end of the comparator unit 23, and one input end of the switched integral comparator 223, the other end of the integrating capacitor 221 and the other end of the reset switch 222 are respectively grounded. The other input of the switched integral comparator 223 is connected to the output of the PI regulation comparator 211 as described above.
In the comparator unit 23, one input terminal of the comparator unit 23 is connected to the output terminal of the switched integration comparator 223, one terminal of the integration capacitor 221, and one terminal of the reset switch 222 as described above. The other input of the comparator is connected to the output of the inverter unit 25 to receive the input current IL of the linear generator power conversion circuit 2 inverted by the inverter unit 25. The arrangement is such that the one-cycle control circuit 20 is configured as a leading-edge mode one-cycle control circuit capable of controlling the on duty ratio of the switching tube S. An output terminal of the comparator unit 23 is connected to an R terminal of the RS flip-flop unit 24.
The R terminal of the RS flip-flop unit 24 is connected to the output terminal of the comparator unit 23 as described above, and the S terminal of the RS flip-flop unit 24 is used to receive a clock signal. The Q terminal of the RS flip-flop unit 24 is connected to the power conversion circuit 2
A control terminal of the switching tube S, the drive signal Ds thus generated having a stable switching frequency, and the other output terminal Q being connected to a control terminal of the reset switch 222 in the switched integrator unit 22.
In the one-cycle control circuit 20, a drive signal for turning on or off the switching unit is output in accordance with the input current (inductor current) IL and the output voltage Vout, so that the phase difference of the input current IL with respect to the input voltage is adjusted by adjusting the on time and the off time of the switching tube S, and the input voltage and the input current of the power conversion circuit 2 are made to be as common in frequency as possible.
In other words, the power conversion circuit 2 can be power factor corrected using the one-cycle control circuit 20 so that the input current has the same frequency as the input voltage as much as possible. Compared with other power factor correction methods adopted in the prior art, the single-period control technology can realize the power factor correction function by sampling the input current IL (namely the input current, the absolute value is obtained) and the output voltage Vout signal of the power conversion circuit without sampling the input voltage signal. The existing single-period control technology is a fixed-frequency PWM control technology, and the switching frequency of a driving signal Ds sent to a switching tube S in a power conversion circuit is a set value and is fixed in the working process of the circuit.
Frequency conversion circuit 10
The frequency conversion control circuit 1 of the present invention further has a frequency conversion circuit 10 on the basis of the one-cycle control circuit 20 as described above.
Specifically, the frequency conversion circuit 10 has a frequency-to-voltage converter 11, a voltage-to-frequency converter 12, and a limiter circuit 13, and the input current IL adjusted by the one-cycle control circuit is sequentially passed through the frequency-to-voltage converter 11, the voltage-to-frequency converter 12, and the limiter circuit 13, and then is supplied to an S terminal, i.e., a clock input terminal, of the RS flip-flop unit 24.
According to the respective functions of the frequency-to-voltage converter 11, the voltage-to-frequency converter 12 and the limiter circuit 13, the output voltage of the frequency-to-voltage converter 11 is proportional to the frequency of the input current, the input voltage of the voltage-to-frequency converter 12 is proportional to the frequency of the output current, and the limiter circuit 13 can limit the output frequency within a specific range. Therefore, the input current IL is used as the input current of the frequency-voltage converter 11, and the input current IL can be converted and then transmitted to the clock input end of the monocycle control circuit 20, so that the clock input frequency of the monocycle control circuit 20 is proportional to the frequency of the input current IL, the clock input frequency is limited within a specific range, and when the input current IL changes, the frequency conversion control based on the OCC is realized.
For example, when the ac power source in fig. 1 is a linear induction generator of a magnetic levitation train, the linear induction generator includes a power generation winding 31, and as the magnetic levitation train travels, electric energy having an induced current and an induced voltage is generated in the power generation winding 31. The induced voltage is the voltage induced by the generator winding, and the amplitude and the frequency of the induced voltage are in direct proportion to the train speed. The induced current and the induced voltage are supplied to the power conversion circuit 2 to be used as an input current and an input voltage, the power factor of the power change circuit 1 is corrected through the monocycle control circuit 20, the input current can have the same frequency as the input voltage, the input current regulated by the monocycle control circuit 20 is supplied to the frequency-voltage converter 11, the voltage-frequency converter 12 and the amplitude limiting circuit 13 of the frequency conversion circuit 10, the clock input frequency of the monocycle control circuit 20 is in direct proportion to the input current frequency and the input voltage frequency and therefore to the train speed, namely, the switching frequency of the switching tube S is in direct proportion to the speed of the magnetic suspension train.
Here, the frequency conversion circuit 10 is implemented as a frequency-to-voltage, voltage-to-frequency circuit, but there are other implementations of the frequency conversion circuit.
Second embodiment of first aspect of the invention
Fig. 3 shows a second embodiment of the variable frequency control circuit based on the single-cycle control technique according to the first aspect of the present invention, wherein the single-cycle control circuit 20 is a single-cycle control circuit in a trailing-edge adjustment mode. The frequency conversion circuit 10 in the second embodiment can have the same form as the frequency conversion circuit 1 in the first embodiment, and also includes a PI regulator unit 21, a switching integrator unit 22, a comparator unit 23, and an RS flip-flop unit 24, which are connected in sequence, in its one-cycle control circuit 20, where like reference numerals denote like components.
Unlike the first embodiment, the one-cycle control circuit 20 in the second embodiment does not include the inverter unit 25, but has a subtractor unit 26, the subtractor unit 26 replacing the inverter unit 25 of the first embodiment of the present invention. That is, the input current IL is input to one input terminal of the subtractor unit 26, the output terminal of the PI regulation comparator 211 is connected to the other input terminal of the subtractor unit 26, and the output terminal of the subtractor unit 26 is connected to one input terminal of the comparator unit 23 which is not used for connecting the switching integration comparator 223, the integration capacitor 221, and the reset switch 222, so that the one-cycle control circuit 20 is configured as a one-cycle control circuit of the trailing-edge mode which can control the off duty ratio of the switching tube S.
Second aspect of the invention
Fig. 4 to 5 show a power generation system of a magnetic-levitation train of a second aspect of the present invention, which comprises a linear induction generator 3, a power conversion circuit 2 and a variable frequency control circuit 1.
The cross section structure of the linear induction generator of the maglev train is shown in fig. 4, a generator winding 31, an electromagnet core 32 and an electromagnet winding 33 are installed on the train, and a long stator core 34 and a stator winding 35 are installed on the track. When the train runs, a magnetic field forms a closed magnetic circuit through an air gap, the electromagnet iron core 32 and the long stator iron core 34, and due to the influence of the cogging effect of the linear synchronous motor, induced potential is generated in the generator winding 31, and the frequency and the amplitude of the induced potential are proportional to the running speed of the train body; when the train reaches a certain speed, the induced potential of the linear generator can provide enough electric energy for the vehicle to use and supply power to the vehicle-mounted storage battery.
As shown in fig. 5, the ac power source is a linear induction generator 3, and the voltage of the linear induction generator is induced by a generator winding 31, and the amplitude and frequency of the linear induction generator are in direct proportion to the train speed. The power conversion circuit 2 is connected to the linear induction generator 3 to obtain an induced current and an induced voltage from the linear induction generator 3 as an input current and an input voltage, and convert the input current and the input voltage into an output current and an output voltage, the power conversion circuit 2 having a switching unit; the specific structure of the frequency conversion control circuit 1 is shown in fig. 2 and 3, and comprises a single-period control circuit 20 and a frequency conversion circuit 10, wherein the single-period control circuit 20 outputs a driving signal for turning on or off a switching unit according to an input current and an output voltage, so that the phase difference of the input current relative to the input voltage is adjusted by adjusting the on or off time of the switching unit; the frequency conversion circuit 10 converts the input current regulated by the monocycle control circuit 20 and then transmits the converted input current to the clock input terminal of the monocycle control circuit 20, so that the clock input frequency of the monocycle control circuit 20 is proportional to the frequency of the input current.
Preferably, the frequency conversion circuit 10 has a frequency-to-voltage converter 11 and a voltage-to-frequency converter 12, and the input current is supplied to the clock input terminal after passing through the frequency-to-voltage converter 11 and the voltage-to-frequency converter 12 in this order.
Preferably, the frequency conversion circuit 10 further includes a limiter circuit 13, and the limiter circuit 13 is connected between the output terminal and the clock input terminal of the voltage-to-frequency converter 12 to limit the clock input frequency within a specific range.
Preferably, since the amplitude and frequency of the input voltage can be proportional to the traveling speed of the magnetic levitation train, the power factor of the power conversion circuit 2 is adjusted by the single-cycle control circuit 20 so that the input current and the input voltage have the same frequency, and thus the frequency of the input current can also be proportional to the traveling speed of the magnetic levitation train, and the input current is supplied to the clock input terminal of the single-cycle control circuit 20 via the frequency conversion circuit 10 so that the clock input frequency of the single-cycle control circuit 20 is proportional to the traveling speed of the magnetic levitation train.
In other words, the present invention, on the one hand, boosts the power factor of the power conversion circuit 10 by the one-cycle control circuit 20 so that the frequency of the input current is the same as the frequency of the input voltage and is accordingly proportional to the train speed.
On one hand, the input current which is in direct proportion to the train speed is input to the frequency-voltage converter, the output voltage of the frequency-voltage converter is in direct proportion to the frequency of the inductive current, the frequency of the inductive current is detected by the frequency-voltage converter and converted into the voltage, so that the speed information of the magnetic suspension train is obtained, the voltage with the speed information can obtain the output frequency which is in direct proportion to the speed of the magnetic suspension train through the frequency-voltage converter, the output frequency is limited in a frequency band range which is suitable for the power conversion circuit through the amplitude limiting circuit, and then the frequency is input as the clock of the single-cycle controller, so that the switching frequency of the switching unit is in direct proportion to the speed of the magnetic suspension train, and the frequency conversion control is realized.
The above-described frequency conversion control will bring about the following advantages.
The inductance of the winding inductance L due to the linear induction generator 3 is proportional to the product of the switching frequency and the inductance value. The inductance value is related to the levitation force and the gap, and is not related to the running speed of the train, and can be considered to be basically constant. By adopting the power generation system of the maglev train, when the train runs at low speed, the switching frequency is correspondingly smaller, so that the inductive reactance of the winding inductance L of the linear induction generator 3 is also correspondingly smaller, and more power can be obtained from the linear induction generator at low speed compared with the prior art.
The terms and expressions which have been employed herein are used as terms of description and not of limitation. The use of such terms and expressions is not intended to exclude any equivalents of the features shown and described (or portions thereof), and it is recognized that various modifications may be made within the scope of the claims. Other modifications, variations, and alternatives are also possible. Accordingly, the claims should be looked to in order to cover all such equivalents.
Also, it should be noted that although the present invention has been described with reference to the current specific embodiments, it should be understood by those skilled in the art that the above embodiments are merely illustrative of the present invention, and various equivalent changes or substitutions may be made without departing from the spirit of the present invention, and therefore, it is intended that all changes and modifications to the above embodiments be included within the scope of the claims of the present application.

Claims (10)

1. A frequency conversion control circuit for a power conversion circuit connected to an alternating current power supply for converting a frequency-variable input current and an input voltage obtained from the alternating current power supply into an output current and an output voltage, the power conversion circuit having a switching unit,
the method is characterized in that:
the frequency conversion control circuit comprises a single-period control circuit and a frequency conversion circuit, wherein:
the single-cycle control circuit outputs a driving signal for turning on or off the switching unit according to the input current and the output voltage, so that a phase difference of the input current with respect to the input voltage is adjusted by adjusting on or off time of the switching unit; and is
The frequency conversion circuit converts the input current regulated by the single-period control circuit and then transmits the converted input current to the clock input end of the single-period control circuit, so that the clock input frequency of the single-period control circuit is in direct proportion to the frequency of the input current.
2. The variable frequency control circuit of claim 1,
the frequency conversion circuit is provided with a frequency-voltage converter and a voltage-frequency converter, and the input current is transmitted to the clock input end after sequentially passing through the frequency-voltage converter and the voltage-frequency converter.
3. The variable frequency control circuit of claim 2,
the frequency translation circuit further includes a limiting circuit connected between the output of the voltage to frequency converter and the clock input to limit the clock input frequency to a particular range.
4. The variable frequency control circuit of claim 1,
the single-period control circuit is a single-period control circuit in a leading edge mode or a single-period control circuit in a trailing edge mode.
5. The variable frequency control circuit of claim 1,
the alternating current power supply is a linear induction generator of the magnetic-levitation train, the linear induction generator comprises a power generation winding, and electric energy with induced current and induced voltage is generated in the power generation winding along with the running of the magnetic-levitation train.
6. The variable frequency control circuit of claim 5,
supplying the induced current and the induced voltage to the power conversion circuit as the input current and the input voltage, the clock input frequency can be proportional to a travel speed of the magnetic levitation train.
7. The utility model provides a maglev train's power generation system, includes linear induction generator, power conversion circuit and frequency conversion control circuit, wherein:
the linear induction generator comprises a power generation winding; generating electric energy with variable frequency induced current and induced voltage in the generating winding along with the running of the magnetic suspension train;
the power conversion circuit is connected to the linear induction generator to obtain an induced current and an induced voltage from the linear induction generator as an input current and an input voltage, and to convert the input current and the input voltage into an output current and an output voltage, the power conversion circuit having a switching unit;
the method is characterized in that:
the frequency conversion control circuit comprises a single-period control circuit and a frequency conversion circuit, wherein:
the single-cycle control circuit outputs a driving signal for turning on or off the switching unit according to the input current and the output voltage, so that a phase difference of the input current with respect to the input voltage is adjusted by adjusting on or off time of the switching unit; and is
The frequency conversion circuit converts the input current regulated by the single-period control circuit and then transmits the converted input current to the clock input end of the single-period control circuit, so that the clock input frequency of the single-period control circuit is in direct proportion to the frequency of the input current.
8. The power generation system of claim 7,
the frequency conversion circuit is provided with a frequency-voltage converter and a voltage-frequency converter, and the input current is transmitted to the clock input end after sequentially passing through the frequency-voltage converter and the voltage-frequency converter.
9. The power generation system of claim 8,
the frequency translation circuit further includes a limiting circuit connected between the output of the voltage to frequency converter and the clock input to limit the clock input frequency to a particular range.
10. The power generation system of claim 8,
the amplitude and frequency of the input current and the input voltage can be proportional to the travelling speed of the magnetic levitation train, so that the clock input frequency of the single-period control circuit is proportional to the travelling speed of the magnetic levitation train.
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Publication number Priority date Publication date Assignee Title
CN112787554A (en) * 2020-12-29 2021-05-11 深圳市大地和电气股份有限公司 Execution method and system based on three-phase alternating current permanent magnet synchronous motor safety state

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101986542A (en) * 2010-11-02 2011-03-16 华南理工大学 PFC (power factor correction) control method with high input power factor and control circuit thereof
CN102332814A (en) * 2011-09-14 2012-01-25 杭州矽力杰半导体技术有限公司 Power factor correction control circuit for reducing EMI (electro magnetic interference)
CN102355130A (en) * 2011-10-09 2012-02-15 南通大学 Double-tube Buck-Boost type PFC (Power Factor Correction) converter based on one-cycle control
CN102497711A (en) * 2011-12-31 2012-06-13 杭州士兰微电子股份有限公司 LED drive circuit and switch power supply containing drive circuit
CN102594118A (en) * 2012-02-29 2012-07-18 杭州矽力杰半导体技术有限公司 Boost PFC controller
CN104993690A (en) * 2015-08-10 2015-10-21 电子科技大学 Full digit single period power factor correction circuit based on triangular wave pulse modulation
CN105281591A (en) * 2015-11-26 2016-01-27 矽力杰半导体技术(杭州)有限公司 Control circuit and control method of power converter
CN106253661A (en) * 2016-08-05 2016-12-21 矽力杰半导体技术(杭州)有限公司 Control circuit, control method and apply its power inverter

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7933132B2 (en) * 2008-04-29 2011-04-26 Fairchild Semiconductor Corporation Synchronizing frequency and phase of multiple variable frequency power converters

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101986542A (en) * 2010-11-02 2011-03-16 华南理工大学 PFC (power factor correction) control method with high input power factor and control circuit thereof
CN102332814A (en) * 2011-09-14 2012-01-25 杭州矽力杰半导体技术有限公司 Power factor correction control circuit for reducing EMI (electro magnetic interference)
CN102355130A (en) * 2011-10-09 2012-02-15 南通大学 Double-tube Buck-Boost type PFC (Power Factor Correction) converter based on one-cycle control
CN102497711A (en) * 2011-12-31 2012-06-13 杭州士兰微电子股份有限公司 LED drive circuit and switch power supply containing drive circuit
CN102594118A (en) * 2012-02-29 2012-07-18 杭州矽力杰半导体技术有限公司 Boost PFC controller
CN104993690A (en) * 2015-08-10 2015-10-21 电子科技大学 Full digit single period power factor correction circuit based on triangular wave pulse modulation
CN105281591A (en) * 2015-11-26 2016-01-27 矽力杰半导体技术(杭州)有限公司 Control circuit and control method of power converter
CN106253661A (en) * 2016-08-05 2016-12-21 矽力杰半导体技术(杭州)有限公司 Control circuit, control method and apply its power inverter

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