CN113037090A - Control method and device of DC/DC converter and computer equipment - Google Patents

Control method and device of DC/DC converter and computer equipment Download PDF

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Publication number
CN113037090A
CN113037090A CN201911354745.7A CN201911354745A CN113037090A CN 113037090 A CN113037090 A CN 113037090A CN 201911354745 A CN201911354745 A CN 201911354745A CN 113037090 A CN113037090 A CN 113037090A
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China
Prior art keywords
converter
bridge arm
phase
frequency
switched
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CN201911354745.7A
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CN113037090B (en
Inventor
刘世军
蔡旭
杨明扬
杨志千
吕敬
艾斯卡尔
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Jinfeng Technology Co ltd
Shanghai Jiaotong University
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Shanghai Jiaotong University
Xinjiang Goldwind Science and Technology 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
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching 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
    • H02M1/14—Arrangements for reducing ripples from dc input or output
    • 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
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
    • H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention discloses a control method and device of a DC/DC converter and computer equipment. The control method of the DC/DC converter comprises the following steps: controlling a multiphase bridge arm in the DC/DC converter to be switched on or switched off according to the modulation wave and the carrier wave, so that the ratio of the frequency of the output current of the DC/DC converter to the frequency of a transformer flux linkage in the DC/DC converter is greater than a preset decoupling threshold value; the modulation waves for each phase of bridge arm are square waves with the same frequency and amplitude and the phase difference of two adjacent bridge arms is 360 degrees/n, and the carrier waves for each phase of bridge arm are the same triangular carrier waves. By adopting the technical scheme in the embodiment of the invention, the decoupling of the transformer flux linkage frequency and the filter frequency in the DC/DC converter can be realized, the working frequency of the filter is improved while the transformer flux linkage frequency is improved, and the size and the cost of the filter are favorably reduced.

Description

Control method and device of DC/DC converter and computer equipment
Technical Field
The invention relates to the technical field of DC/DC converters, in particular to a control method and device of a DC/DC converter and computer equipment.
Background
The DC/DC converter is used for converting the direct current into direct current output with different voltages. The DC/DC converter generally adopts phase-shift duty ratio modulation, and the output current i of a secondary tube bridge is modulateddcmThe frequency of the medium ac component is coupled to the frequency of the transformer flux linkage.
At present, the volume of the magnetic core of the transformer can be effectively reduced by increasing the frequency of the transformer flux linkage of the DC/DC converter, but the increase of the flux linkage frequency can bring influence to the insulation and heat dissipation of the transformer. Considering the volume of the heat sink and the insulating material, the loss will increase without decreasing the volume of the transformer after the flux linkage frequency exceeds a certain threshold, and therefore, for a high voltage, high power transformer, the higher the frequency of the transformer flux linkage is, the better is not. In contrast, for the output-side filter of the DC/DC converter, the higher the current ripple frequency, the smaller the filter volume.
Therefore, there is a contradiction between the transformer volume and the filter volume of the DC/DC converter.
Disclosure of Invention
The embodiment of the invention provides a control method and device of a DC/DC converter and computer equipment, which can realize the decoupling of the transformer flux linkage frequency and the filter frequency in the DC/DC converter, improve the working frequency of the filter while improving the transformer flux linkage frequency and are beneficial to reducing the size and the cost of the filter.
In a first aspect, an embodiment of the present invention provides a method for controlling a DC/DC converter, where the method includes:
generating a Pulse Width Modulation (PWM) signal according to the modulation wave and the carrier;
controlling a multiphase bridge arm in the DC/DC converter to be switched on or switched off according to the PWM signal, so that the ratio of the frequency of the output current of the DC/DC converter to the frequency of a transformer flux linkage in the DC/DC converter is greater than a preset decoupling threshold;
the modulation waves for each phase of bridge arm are square waves with the same frequency and amplitude and the phase difference of two adjacent bridge arms is 360 degrees/n, and the carrier waves for each phase of bridge arm are the same triangular carrier waves.
In one possible implementation manner of the first aspect, the step of controlling a multiphase bridge arm in the DC/DC converter to be turned on or off according to the modulation wave and the carrier wave includes: aiming at each phase of bridge arm, comparing the amplitude of the modulation wave of the phase of bridge arm at the same time with the amplitude of the corresponding carrier wave, and respectively generating a first level signal and a second level signal according to the comparison result, wherein the first level signal and the second level signal are opposite in level; and controlling the upper bridge arm of the phase bridge arm to be switched on or switched off according to the first level signal, and controlling the lower bridge arm of the phase bridge arm to be switched on or switched off according to the second level signal.
In a possible implementation manner of the first aspect, after the step of controlling the multiphase bridge arm in the DC/DC converter to be turned on or off according to the modulation wave and the carrier, the method further includes: and adjusting the amplitude of the modulation wave according to the given output power of the DC/DC converter or the difference value of the given output power and the feedback output power.
In a possible embodiment of the first aspect, the frequency of the modulated wave is determined according to the transformer volume, the transformer efficiency and the transformer insulation performance.
In a possible embodiment of the first aspect, the frequency of the carrier is determined from the switching losses of the DC/DC converter and the filter volume.
In a second aspect, an embodiment of the present invention provides a control apparatus for a DC/DC converter, including:
the PWM signal generation module is used for generating a PWM signal according to the modulation wave and the carrier wave;
the control module is used for controlling a multiphase bridge arm in the DC/DC converter to be switched on or switched off according to the PWM signal so that the ratio of the frequency of the output current of the DC/DC converter to the frequency of a transformer flux linkage in the DC/DC converter is greater than a preset decoupling threshold;
the modulation waves for each phase of bridge arm are square waves with the same frequency and amplitude and the phase difference of two adjacent bridge arms is 360 degrees/n, and the carrier waves for each phase of bridge arm are the same triangular carrier waves.
In a possible implementation manner of the second aspect, the control module is specifically configured to compare, for each phase bridge arm, an amplitude of a modulation wave of the phase bridge arm at the same time with an amplitude of a carrier wave, and generate a first level signal and a second level signal according to a comparison result, where the first level signal and the second level signal are opposite in level; and controlling the upper bridge arm of the phase bridge arm to be switched on or switched off according to the first level signal, and controlling the lower bridge arm of the phase bridge arm to be switched on or switched off according to the second level signal.
In a possible embodiment of the second aspect, the control module is further configured to adjust the amplitude of the modulated wave according to a given output power of the DC/DC converter, or a difference between the given output power and the feedback output power.
In a possible embodiment of the second aspect, the device is provided in a converter controller.
In a third aspect, an embodiment of the present invention provides a computer device having a program stored thereon, the program, when executed by a processor, implementing the control method of the DC/DC converter as described above.
The embodiment of the invention adopts the square wave as the modulation wave and controls the multiphase bridge arm in the DC/DC converter according to the square wave and the triangular carrier wave, so that the ratio of the frequency of the output current of the DC/DC converter to the frequency of the transformer flux linkage in the DC/DC converter can be larger than the preset decoupling threshold value, namely the decoupling between the frequency of the current at the output side of the DC/DC converter and the frequency of the transformer flux linkage can be realized, thereby improving the frequency of the output current and reducing the size of the filter without improving the frequency of the transformer flux linkage.
Drawings
The present invention will be better understood from the following description of specific embodiments thereof taken in conjunction with the accompanying drawings, in which like or similar reference characters designate like or similar features.
FIG. 1 is a schematic diagram of a structural topology of a three-phase single-active-bridge DC/DC converter;
FIG. 2 is a timing diagram of a DC level based modulation principle and corresponding circuit parameters of a DC/DC converter according to an embodiment of the present invention;
FIG. 3 is a flow chart of a control method of the DC/DC converter according to an embodiment of the present invention;
FIG. 4 is a timing diagram of the square wave based modulation principle and corresponding circuit parameters of the DC/DC converter according to the embodiment of the present invention;
FIG. 5 is a logic diagram of a power closed loop control provided by an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a control device of a DC/DC converter according to an embodiment of the present invention;
FIG. 7 is a schematic view of an offshore wind farm topology according to an embodiment of the present invention;
fig. 8 is a second schematic view of a marine wind farm topology according to an embodiment of the present invention.
Detailed Description
Features and exemplary embodiments of various aspects of the present invention will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention.
Fig. 1 is a structural topological schematic diagram of a three-phase single-active-bridge DC/DC converter.
As shown in FIG. 1, the three-phase single-active-bridge DC/DC converter is sequentially composed of an input side capacitor CinAn input-side three-phase inverter 101, a three-phase transformer 102, an output-side three-phase diode bridge 103, and an input-side capacitor CoutAnd an output side low pass filter LfilterAnd (4) forming.
At present, a modulation method of a three-phase single-active-bridge DC/DC converter is as follows: the direct current with adjustable amplitude and the triangular carrier with fixed amplitude and three phases with 120 degrees of mutual difference are compared, three paths of PWM pulses with adjustable duty ratios and 120 degrees of phase mutual difference modulate the PWM pulses, and the three paths of PWM pulses are respectively used as trigger signals of a three-phase controllable rectifier bridge in the inverter 101.
Since the DC/DC converter outputs a direct current and does not need to follow a current waveform, a direct current level is generally used as a modulation wave of the DC/DC converter.
Fig. 2 is a timing state diagram of a modulation principle based on a DC level and corresponding circuit parameters of the DC/DC converter according to an embodiment of the present invention.
The first row of coordinate regions shows the timing states of one path of direct current and three paths of triangular carriers Ca, Cb and Cc. The frequencies and amplitudes of Ca, Cb and Cc are equal, and the phases are different by 120 degrees.
The second row coordinate region shows i after modulationdcmIn a time sequence state of (b), wherein idcmThe output side current of the three-phase diode bridge of the DC/DC converter can be used for representing the working frequency of the filter.
The third coordinate region shows i after modulationaIn a time sequence state of (b), wherein iaFor the a phase line current at the input side of the transformer, i can be usedaRepresents the flux linkage frequency of the transformer.
By analysis of iaThe change trend of (2) can obtain 9 modes of the DC/DC converter circuit in one cycle, and the mode numbers are respectively: a1, a2, a3, b1, b2, b3, c1, c2 and c 3.
Referring to FIG. 2, assume that T is usedidcmRepresents idcmPeriod of (a), TicAnd icThe period of (c) then has:
Tidcm＝Ti3/3
correspondingly, assume with fidcmRepresents idcmFrequency of (f)iaRepresents iaThe frequencies of (c) are:
fidcm′＝3×fia
that is, idcm' and iaIs 3 to 1, i.e. the frequency of the DC/DC converter output side current and the frequency of the transformer flux linkage are coupled together at 3 to 1.
In the output side filter of the DC/DC converter, the volume of the output side current is smaller as the frequency is higher, but in terms of transformer insulation and heat dissipation, the transformer volume does not decrease and increase and the loss increases when the frequency of the transformer flux exceeds a certain threshold, that is, the frequency of the transformer flux cannot be excessively high, and therefore, the contradiction between the high frequency of the output side current of the DC/DC converter and the low frequency of the transformer flux is prominent, making it difficult to further reduce the volume of the DC/DC converter.
In order to solve the above contradiction, the embodiments of the present invention provide a method and an apparatus for controlling a DC/DC converter, and a computer device. By adopting the technical scheme in the embodiment of the invention, the decoupling of the transformer flux linkage frequency and the filter frequency in the DC/DC converter can be realized, namely the working frequency of the filter can be improved while the transformer flux linkage frequency is not improved, and the size and the cost of the filter are favorably reduced.
Fig. 3 is a flowchart illustrating a control method of the DC/DC converter according to an embodiment of the present invention.
As shown in fig. 3, a control method of a DC/DC converter according to an embodiment of the present invention includes steps 301 and 302.
In step 301, a Pulse Width Modulation (PWM) signal is generated from a modulation wave and a carrier;
in step 302, a multiphase bridge arm in the DC/DC converter is controlled to be turned on or off according to the generated PWM signal, so that a ratio of a frequency of an output current of the DC/DC converter to a frequency of a transformer flux linkage in the DC/DC converter is greater than a preset decoupling threshold.
The modulation waves for each phase of bridge arm are square waves with the same frequency and amplitude and the phase difference of two adjacent bridge arms is 360 degrees/n, and the carrier waves for each phase of bridge arm are the same triangular carrier waves.
Fig. 4 is a timing diagram of a square wave based modulation principle and corresponding circuit parameters of the DC/DC converter according to an embodiment of the present invention.
The first row of coordinate area shows the time sequence states of three paths of square waves a, b and c and one path of triangular carrier waves, wherein the frequencies of a, b and c are all fsThe amplitudes are m, the phases are 120 degrees apart, and the frequency of the triangular carrier signal is fcThe amplitude is 1.
The second row coordinate region shows i after modulationdcm' of a time sequence state, whereindcm' output side current i of three-phase diode bridge of DC/DC converterdcmEquivalent current of, available from idcmThe frequency of' denotes the operating frequency of the filter.
The third row coordinate region shows i after modulationcIn a time sequence state of (b), wherein icFor the c-phase line current at the input side of the transformer, i can be usedcFrequency represents the flux linkage frequency of the transformer.
Taking fig. 4 as an example, during modulation, three square wave signals a, b, and c respectively aim at a three-phase bridge arm of the DC/DC converter, and by comparing the amplitude of the square wave signal belonging to the same phase at the same time with the amplitude of the corresponding triangular carrier signal, a pulse width modulation PWM signal corresponding to the bridge arm of the corresponding phase can be obtained.
The specific implementation steps are as follows: and aiming at each phase of bridge arm, comparing the amplitude of the square wave signal of the phase of bridge arm at the same moment with the amplitude of the corresponding triangular carrier signal, and respectively generating a first level signal and a second level signal according to the comparison result, wherein the first level signal and the second level signal are opposite in level at the same moment. And then controlling the upper bridge arm of the phase bridge arm to be switched on or switched off according to the first level signal and controlling the lower bridge arm of the phase bridge arm to be switched on or switched off according to the second level signal.
Here, the first level signal and the second level signal take a high level or a low level.
The upper bridge arm and the lower bridge arm both adopt P-type transistors as an example, and at a certain time, if the amplitude of the square wave signal is greater than that of the corresponding triangular carrier signal, a low-level signal is generated for the upper bridge arm to control the upper bridge arm to be switched on, and a high-level signal is generated for the lower bridge arm to control the lower bridge arm to be switched off. On the contrary, if the amplitude of the square wave signal is smaller than the amplitude of the corresponding triangular carrier signal, a high-level signal is generated for the upper bridge arm to control the upper bridge arm to be switched off, and a low-level signal is generated for the lower bridge arm to control the lower bridge arm to be switched on.
By analysis of icCan obtain DC/DC conversionThe circuit has 36 modes in one cycle, and the mode numbers are respectively: a1, a2, a3, b1, b2, b3, c1, c2, c3, d1, d2, d3, e1, e2, e3, f1, f2, f3, g1, g2, g3, h1, h2, h3, i1, i2, i3, j1, j2, j3, k1, k2, k3, l1, l2, l 3.
Referring to FIG. 4, assume that T is usedidcm′Represents idcmPeriod of `, TicAnd icThe period of (c) then has:
Tidcm′＝Tic/12
correspondingly, assume with fidcm′Represents idcmFrequency of `, ficRepresents icThe frequencies of (c) are:
fidcm′＝12×fic
that is, idcm' and icIs 12 to 1, i.e. the ratio of the frequency of the output side current to the frequency of the transformer flux linkage is 12:1, much larger than the 3 to 1 mentioned in fig. 1. In this way, the output side filter can still have a higher frequency in case the frequency of the transformer flux linkage of the DC/DC converter is lower. Considering that the volume of the filter is smaller as the frequency of the output side is higher, the volume of the filter is not limited by the frequency of the transformer flux linkage, so that the contradiction between the high frequency of the output measuring current of the DC/DC converter and the low frequency of the transformer flux linkage can be solved, and the volume of the DC/DC converter can be further reduced.
As described above, the square wave is used as the modulation wave and the multiphase bridge arm in the DC/DC converter is controlled according to the square wave and the triangular carrier wave, so that the ratio of the frequency of the output current of the DC/DC converter to the frequency of the transformer flux linkage in the DC/DC converter can be greater than the preset decoupling threshold, that is, the decoupling between the frequency of the output side current of the DC/DC converter and the frequency of the transformer flux linkage can be realized, and thus the frequency of the output current can be increased and the size of the filter can be reduced without increasing the frequency of the transformer flux linkage.
In addition, compared with other modulation waves such as a sine wave and the like, the square wave is adopted as the modulation wave, so that an alternating current component is not introduced to the output side of the DC/DC converter, and the control precision of the DC/DC converter is favorably improved.
In addition, the transmission power of the DC/DC converter can be controlled by adjusting the amplitude m of the square wave.
In some embodiments, the corresponding m can be directly calculated from the power (given output power) that needs to be delivered by the DC/DC converter for power open loop control.
In some embodiments, referring to fig. 5, based on the feedback regulation principle, the amplitude m of the modulation wave is adjusted according to the difference between the given output power P of the DC/DC converter and the feedback output power P, so as to perform power closed-loop control, where the closed-loop control can improve the power control accuracy of the converter compared to open-loop control.
In some embodiments, the frequency of the square wave may be determined based on the transformer volume, transformer efficiency, and transformer insulation performance. For example, increasing the frequency of the square wave can effectively reduce the volume of the magnetic core of the transformer and improve the conversion efficiency of the transformer, but the increase of the frequency of the square wave can affect the insulation and heat dissipation of the transformer. Considering the volume of the heat sink and the insulating material, the volume of the transformer does not decrease or increase after the square wave frequency exceeds a certain threshold value, and the loss also increases. Therefore, before the DC/DC converter is modulated by using the square wave and the triangular carrier, the frequency of the square wave may be selected according to the size of the transformer, the efficiency of the transformer, and the insulation performance of the transformer, so that the design of the modulated DC/DC converter on the transformer side is optimized.
In some embodiments, the frequency of the triangular carrier may be determined from the switching losses and filter volume of the DC/DC converter. For example, the higher the frequency of the triangular carrier wave is, the larger the switching loss is, but the smaller the filter volume is, so that before the DC/DC converter is modulated by using the square wave and the triangular carrier wave, the influence of the switching loss and the filter volume of the DC/DC converter can be balanced and considered, and the carrier frequency is selected in a compromise manner, so that the design of the modulated DC/DC converter on the filter side is optimized.
Of course, before the DC/DC converter is modulated by using the square wave and the triangular carrier, the frequency of the square wave may be determined according to the optimal frequency of the transformer flux linkage, and the carrier frequency may be selected in consideration of the influence of the switching loss and the filter volume of the DC/DC converter, so that the designs of the modulated DC/DC converter on the transformer side and the filter side are optimized.
Fig. 6 is a schematic diagram of a control device of a DC/DC converter according to an embodiment of the present invention.
As shown in fig. 6, the control device of the DC/DC converter according to the embodiment of the present invention includes: a PWM signal generation module 601 and a control module 602.
The PWM signal generation module 601 is configured to generate a PWM signal according to a modulation wave and a carrier; the control module 602 is configured to control a multiphase bridge arm in the DC/DC converter to be turned on or off according to the PWM signal, so that a ratio between a frequency of an output current of the DC/DC converter and a frequency of a transformer flux linkage in the DC/DC converter is greater than a preset decoupling threshold.
The modulation waves for each phase of bridge arm are square waves with the same frequency and amplitude and the phase difference of two adjacent bridge arms is 360 degrees/n, and the carrier waves for each phase of bridge arm are the same triangular carrier waves.
The embodiment of the invention adopts the square wave as the modulation wave and controls the multiphase bridge arm in the DC/DC converter according to the square wave and the triangular carrier wave, so that the ratio of the frequency of the output current of the DC/DC converter to the frequency of the transformer flux linkage in the DC/DC converter can be larger than the preset decoupling threshold value, namely the decoupling between the frequency of the current at the output side of the DC/DC converter and the frequency of the transformer flux linkage can be realized, thereby improving the frequency of the output current and reducing the size of the filter without improving the frequency of the transformer flux linkage.
In some embodiments, the control module is specifically configured to compare, for each phase of the bridge arm, an amplitude of a modulation wave of the phase of the bridge arm with an amplitude of a carrier at the same time, and generate a first level signal and a second level signal according to a comparison result, where the first level signal and the second level signal are opposite in level to each other; and controlling the upper bridge arm of the phase bridge arm to be switched on or switched off according to the first level signal, and controlling the lower bridge arm of the phase bridge arm to be switched on or switched off according to the second level signal.
In some embodiments, the control module is further configured to adjust the amplitude of the modulation wave according to a given output power of the DC/DC converter, or a difference between the given output power and the feedback output power.
The control device of the DC/DC converter in the embodiment of the present invention may be provided in the converter controller, and thus, there is no need to change any hardware, and the control device may be a logic device having an independent operation function, which is not limited herein.
An application scenario of the DC/DC converter based on the square wave modulation technique in the embodiment of the present invention is described below with reference to fig. 7 and 8.
The wind turbine shown in fig. 7 is an ac output wind turbine.
As shown in fig. 7, after the alternating current generated by the wind turbine passes through a step-up transformer 701, the low-voltage alternating current or the medium-voltage alternating current is increased to the medium-voltage or high-voltage alternating current of 33KV, and a plurality of alternating current output wind turbine generators are connected with the alternating current side of a flexible direct current converter station 703 at the alternating current collection network after passing through a step-up transformer 702, and the power is sent out through a direct current line.
However, when the single-machine capacity of the wind turbine generator is further expanded and the distance between the generators is further increased, the problem of stability of the alternating voltage also occurs in the alternating current collection network. In this case, the power generation and transmission method of the dc-collective dc transmission shown in fig. 6 may be adopted.
The wind turbine shown in fig. 8 is a direct current output wind turbine.
As shown in fig. 8, after the alternating current generated by the fans is rectified by a rectifier 801, the low-voltage direct current or the medium-voltage direct current is increased to the medium-voltage or the high-voltage direct current by 30KV through a primary DC/DC converter 802, and after the direct currents of a plurality of fans are collected, the direct voltage level is further increased through a sending-end DC/DC converter station 803, and the power is sent out through a direct current line.
In order to reduce the cost, the DC/DC converter 802 and the sending-end DC/DC converter 803 in the DC output wind turbine generator set may both adopt a single active bridge converter, and the modulation strategy and the control method provided herein are beneficial to designing a single active bridge converter with high voltage and large capacity, and are beneficial to improving the power density of the converter.
It should be clear that the embodiments in this specification are described in a progressive manner, and the same or similar parts in the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. For the device embodiments, reference may be made to the description of the method embodiments in the relevant part. Embodiments of the invention are not limited to the specific steps and structures described above and shown in the drawings. Those skilled in the art may make various changes, modifications and additions to, or change the order between the steps, after appreciating the spirit of the embodiments of the invention. Also, a detailed description of known process techniques is omitted herein for the sake of brevity.
The functional blocks shown in the above-described structural block diagrams may be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, it may be, for example, an electronic circuit, an Application Specific Integrated Circuit (ASIC), suitable firmware, plug-in, function card, or the like. When implemented in software, the elements of an embodiment of the invention are the programs or code segments used to perform the required tasks. The program or code segments may be stored in a machine-readable medium or transmitted by a data signal carried in a carrier wave over a transmission medium or a communication link. A "machine-readable medium" may include any medium that can store or transfer information. Examples of a machine-readable medium include electronic circuits, semiconductor memory devices, ROM, flash memory, Erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, Radio Frequency (RF) links, and so forth. The code segments may be downloaded via computer networks such as the internet, intranet, etc.
Embodiments of the present invention may be embodied in other specific forms without departing from its spirit or essential characteristics. For example, the algorithms described in the specific embodiments may be modified without departing from the basic spirit of the embodiments of the present invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the embodiments of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims (10)

1. A method of controlling a DC/DC converter, comprising:
generating a Pulse Width Modulation (PWM) signal according to the modulation wave and the carrier;
controlling a multiphase bridge arm in the DC/DC converter to be switched on or switched off according to the PWM signal, so that the ratio of the frequency of the output current of the DC/DC converter to the frequency of a transformer flux linkage in the DC/DC converter is greater than a preset decoupling threshold;
the modulation waves for each phase of bridge arm are square waves with the same frequency and amplitude and the phase difference between two adjacent bridge arms is 360 DEG/n, the carrier waves for each phase of bridge arm are the same triangular carrier waves, and n is the phase number of each phase of bridge arm.
2. The method according to claim 1, wherein the step of controlling the multiphase bridge arm in the DC/DC converter to be turned on or off according to the modulated wave and the carrier wave comprises:
for each phase of the bridge arm,
comparing the amplitude of the modulation wave of the phase bridge arm with the amplitude of the corresponding carrier wave at the same time, and respectively generating a first level signal and a second level signal according to the comparison result, wherein the first level signal and the second level signal are opposite in level;
and controlling the upper bridge arm of the phase bridge arm to be switched on or switched off according to the first level signal, and controlling the lower bridge arm of the phase bridge arm to be switched on or switched off according to the second level signal.
3. The method of claim 1, wherein after the step of controlling a multiphase leg in the DC/DC converter to be turned on or off according to the modulated wave and the carrier, the method further comprises:
and adjusting the amplitude of the modulation wave according to the given output power of the DC/DC converter or the difference value of the given output power and the feedback output power.
4. The method of claim 1, wherein the frequency of the modulated wave is determined according to transformer volume, transformer efficiency, and transformer insulation performance.
5. The method of claim 1, wherein the frequency of the carrier is determined based on a switching loss and a filter volume of the DC/DC converter.
6. A control device for a DC/DC converter, comprising:
the PWM signal generation module is used for generating a PWM signal according to the modulation wave and the carrier wave;
the control module is used for controlling a multiphase bridge arm in the DC/DC converter to be switched on or switched off, so that the ratio of the frequency of the output current of the DC/DC converter to the frequency of a transformer flux linkage in the DC/DC converter is greater than a preset decoupling threshold;
the modulation waves for each phase of bridge arm are square waves with the same frequency and amplitude and the phase difference between two adjacent bridge arms is 360 DEG/n, the carrier waves for each phase of bridge arm are the same triangular carrier waves, and n is the phase number of each phase of bridge arm.
7. The apparatus of claim 6,
the control module is specifically configured to compare, for each phase of bridge arm, an amplitude of a modulation wave of the phase of bridge arm at the same time with an amplitude of the carrier wave, and generate a first level signal and a second level signal according to a comparison result, where the first level signal and the second level signal are opposite in level; and controlling the upper bridge arm of the phase bridge arm to be switched on or switched off according to the first level signal, and controlling the lower bridge arm of the phase bridge arm to be switched on or switched off according to the second level signal.
8. The apparatus of claim 6,
the control module is further used for adjusting the amplitude of the modulation wave according to the given output power of the DC/DC converter or the difference value of the given output power and the feedback output power.
9. The device according to any of claims 6-8, characterized in that it is arranged in a converter controller.
10. A computer device having a program stored thereon, wherein the program, when executed by a processor, implements the method of controlling a DC/DC converter according to any one of claims 1 to 5.
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