CN114938145B - Method and system for suppressing short-circuit current clamp of voltage-multiplying series resonant converter - Google Patents

Method and system for suppressing short-circuit current clamp of voltage-multiplying series resonant converter Download PDF

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CN114938145B
CN114938145B CN202210661659.6A CN202210661659A CN114938145B CN 114938145 B CN114938145 B CN 114938145B CN 202210661659 A CN202210661659 A CN 202210661659A CN 114938145 B CN114938145 B CN 114938145B
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short
circuit current
converter
circuit
value
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CN114938145A (en
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郭铭群
蒋维勇
李晖
刘增训
索之闻
周宇
王智冬
王菲
拾扬
曾萍
薛振宇
陈启超
佟宇梁
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State Grid Jiangxi Electric Power Co ltd
State Grid Jiangxi Electric Power Co ltd Ji'an Power Supply Branch
State Grid Economic And Technological Research Institute Co LtdB412 State Grid Office
State Grid Corp of China SGCC
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State Grid Jiangxi Electric Power Co ltd
State Grid Jiangxi Electric Power Co ltd Ji'an Power Supply Branch
State Grid Economic And Technological Research Institute Co LtdB412 State Grid Office
State Grid Corp of China SGCC
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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
    • H02M3/3353—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 at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
    • H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
    • H02H7/1213—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for DC-DC converters
    • 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
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
    • 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
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • 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

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

Abstract

The invention relates to a method and a system for suppressing short-circuit current clamping of a voltage-multiplying series resonant converter, wherein the method comprises the following steps: acquiring output current of the converter, calculating a first difference value between a given threshold value of the short-circuit current and the output current, and judging that a short-circuit fault occurs according to the first difference value; acquiring positive and negative working pulse widths of input voltage of a transformer in the converter through the first difference value, and regulating and controlling a short-circuit current peak value by regulating the positive and negative working pulse widths; detecting the average value of the short-circuit current, calculating a second difference value between a given threshold value of the average value of the short-circuit current and the average value of the short-circuit current, acquiring the working frequency of the converter according to the second difference value, and controlling the working frequency to realize the regulation and control of the average value of the short-circuit current; and modulating the regulated positive and negative working pulse width and working frequency through PWM to obtain driving signals of all IGBTs in the converter. The invention improves the operation safety of the voltage-multiplying series resonant converter, can maintain the fault characteristic and is used for fault positioning.

Description

Short-circuit current clamping inhibition method and system of voltage-multiplying series resonant converter
Technical Field
The invention relates to the technical field of power electronics, in particular to a method and a system for restraining a short-circuit current clamp of a voltage-multiplying series resonant converter.
Background
The series resonant converter has the excellent characteristics of soft switching, high efficiency, small volume and the like, obtains long-term attention of researchers, and is widely applied to the fields of direct-current power supplies and new energy direct-current transformation. The series resonant converter is combined with the multi-voltage rectifying circuit, and the formed multi-voltage series resonant converter can be used as a direct current transformer for new energy direct current collection. Compared with a traditional double-active bridge converter, the voltage-multiplying resonant converter has high step-up ratio, can realize full-range soft switching, can reduce loss, and is favorable for high frequency and light weight. The application scene is easy to expand, and the method is suitable for direct current collection of new energy electric energy in deep sea or remote inland.
However, the current voltage-multiplying series resonant converter faces a bottleneck problem in new energy direct current collection application, namely, when the converter works in a steady state, the resonant converter works near a resonant frequency, so that the impedance of a resonant network is close to 0, and therefore, after a short-circuit fault occurs, a short-circuit current reaches a very large peak value in a short time, and the current of a circuit is uncontrollable, thereby seriously threatening the work of the converter. For application scenarios in deep sea or remote inland, maintenance is inconvenient and labor cost is high, and short-circuit faults threaten the safety of the converter and influence the fault ride-through capability of the whole new energy power transmission system.
In addition, for new energy direct current collection, each collection direct current transformer usually adopts an input parallel connection and output parallel connection structure. When a short-circuit fault occurs in a certain line in the system, each converter cannot be locked immediately, but needs to operate continuously for a period of time, so that the control and protection system can identify and locate the fault occurrence position.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a method and a system for suppressing a short-circuit current clamp of a voltage-multiplying series resonant converter, which improve the operation safety of the voltage-multiplying series resonant converter, and can maintain the fault characteristics for fault location.
In order to achieve the purpose, the invention adopts the following technical scheme: a method for suppressing a short-circuit current clamp of a voltage-multiplying series resonant converter comprises the following steps: acquiring output current of a converter, calculating a first difference value between a given threshold value of short-circuit current and the output current, and judging that short-circuit fault occurs according to the first difference value; when short-circuit fault occurs, acquiring positive and negative working pulse widths of input voltage of a transformer in the converter through the first difference value, and regulating and controlling a short-circuit current peak value by adjusting the positive and negative working pulse widths; detecting the average value of the short-circuit current, calculating a second difference value between a given threshold value of the average value of the short-circuit current and the average value of the short-circuit current, acquiring the working frequency of the converter according to the second difference value, and controlling the working frequency to realize the regulation and control of the average value of the short-circuit current; and PWM modulating the regulated positive and negative working pulse width and the working frequency to obtain driving signals of all IGBTs in the converter.
Further, the method for acquiring the output current of the converter comprises the following steps:
a clamping diode is connected in parallel with a resonant capacitor, the cathode of the clamping diode is connected with the anode of the resonant capacitor, and the anode of the clamping diode is connected with the cathode of the resonant capacitor;
when the circuit works normally, current is output after passing through the resonant capacitor and is used as the output current;
and when the short circuit occurs, the voltage of the resonant capacitor is zero, and the short-circuit current flows through the clamping diode and then is output as the output current.
Further, the determining that the short-circuit fault occurs according to the first difference value includes: and when the first difference value is a negative value, judging that a short-circuit fault occurs.
Further, the obtaining of the positive and negative working pulse widths of the input voltage of the transformer through the first difference value includes: and generating the positive and negative working pulse width after the first difference value passes through a PI controller.
Further, the positive and negative working pulse widths are adjusted to further adjust and control the peak value of the short-circuit current, and the adjusting and controlling rule is as follows:
Figure 52471DEST_PATH_IMAGE001
in the formula (I), the compound is shown in the specification,I p for the peak value of the short-circuit current,n T for the step-up ratio of the transformer in the converter,U L is the direct-current voltage at the low-voltage side of the transformer,L r in order to be a resonant inductor, the inductor,T P the positive and negative working pulse widths.
Further, the obtaining the operating frequency of the converter from the second difference value includes: and outputting the working frequency after the second difference value passes through a PI controller.
Further, in controlling the working frequency to realize the regulation of the short-circuit current average value, the working frequency is regulated by regulating the zero level time, and the regulation rule is as follows:
Figure 969612DEST_PATH_IMAGE002
in the formula (I), the compound is shown in the specification,
Figure 811666DEST_PATH_IMAGE003
is the average value of the short-circuit current,f s for the purpose of the switching frequency of the converter,i f is the short-circuit current transient value and,I p for the peak value of the short-circuit current,T d is the time of the zero level that is,T P for said positive and negative working pulse widths, t 0 Is the starting time.
A short circuit current clamp suppression system of a voltage-multiplying series resonant converter, comprising: the fault determination module is used for acquiring the output current of the converter, calculating a first difference value between a given threshold value of the short-circuit current and the output current, and determining that the short-circuit fault occurs according to the first difference value; the first regulating and controlling module is used for acquiring positive and negative working pulse widths of input voltage of the transformer in the converter through the first difference value when a short-circuit fault occurs, and regulating and controlling the peak value of the short-circuit current through regulating the positive and negative working pulse widths; the second regulating and controlling module is used for detecting the average value of the short-circuit current, calculating a second difference value between a given threshold value of the average value of the short-circuit current and the average value of the short-circuit current, acquiring the working frequency of the converter according to the second difference value, and controlling the working frequency to realize the regulation and control of the average value of the short-circuit current; and the output module is used for obtaining the driving signal of each IGBT in the converter after the regulated positive and negative working pulse width and the working frequency are subjected to PWM modulation.
A computer readable storage medium storing one or more programs, the one or more programs comprising instructions, which when executed by a computing device, cause the computing device to perform any of the above methods.
A computing device, comprising: one or more processors, memory, and one or more programs stored in the memory and configured to be executed by the one or more processors, the one or more programs including instructions for performing any of the above-described methods.
Due to the adoption of the technical scheme, the invention has the following advantages:
1. according to the invention, the short-circuit current suppression of the voltage-multiplying series resonant converter is realized by means of a diode clamping resonant capacitor method, the operation safety of the voltage-multiplying series resonant converter is improved, and the fault characteristic can be maintained for fault positioning.
2. When the voltage-multiplying series resonant converter has a short-circuit fault, the invention can inhibit the short-circuit current. When the input parallel connection structure and the output parallel connection structure are combined, the short-circuit fault positioning device also has the capability of accurately positioning the short-circuit fault.
Drawings
Fig. 1 is a flowchart of a method for suppressing a short-circuit current clamp of a voltage-multiplying series resonant converter according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a triple voltage series resonant converter topology in an embodiment of the invention;
FIG. 3 is a schematic diagram of a control method according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a short-circuit current suppression loop according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a short-circuit current according to an embodiment of the present invention;
fig. 6 is a schematic diagram of an n-voltage-multiplying series resonant converter in an embodiment of the invention;
fig. 7 is a schematic diagram of a short-circuit current path of an arbitrary n-times voltage series resonant converter in an embodiment of the present invention;
FIG. 8a is a diagram of the primary side current of the transformer when the quadruple voltage series resonant converter is adopted in one embodiment of the present inventioni p The current limiting effect simulation diagram of (1);
FIG. 8b illustrates conversion when a quadruple voltage series resonant converter is used in an embodiment of the present inventionThe working frequency of the device is 9kHz, and the positive and negative working pulse widths of the input voltage of the transformerT P The effect simulation diagram of the short-circuit current condition is 50 us;
FIG. 8c shows the operating frequency of the quadruple voltage series resonant converter is 9kHz and the positive and negative operating pulse widths of the input voltage of the transformer when the quadruple voltage series resonant converter is adopted in the embodiment of the present inventionT P The effect simulation diagram of the short-circuit current condition is 45 us;
FIG. 8d is a graph showing the operating frequency of the quadruple voltage series resonant converter and the positive and negative operating pulse widths of the input voltage of the transformer when the converter is operated at 9kHz according to an embodiment of the present inventionT P The effect simulation diagram of the short-circuit current condition is 40 us;
FIG. 8e shows the working frequency of the quadruple voltage series resonant converter is 7kHz and the input voltage positive and negative working pulse widths of the transformer when the quadruple voltage series resonant converter is adopted in one embodiment of the present inventionT P The effect of the short-circuit current condition at 50us is simulated.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention, are within the scope of the invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The invention provides a method and a system for suppressing short-circuit current clamping of a voltage-multiplying series resonant converter, which comprises the following steps: acquiring output current of the converter, calculating a first difference value between a given threshold value of the short-circuit current and the output current, and judging that a short-circuit fault occurs according to the first difference value; when short-circuit fault occurs, positive and negative working pulse widths of input voltage of a transformer in the converter are obtained through the difference value, and the peak value of short-circuit current is regulated and controlled by adjusting the positive and negative working pulse widths; detecting the average value of the short-circuit current, calculating a second difference value between a given threshold value of the average value of the short-circuit current and the average value of the short-circuit current, acquiring the working frequency of the converter according to the second difference value, and controlling the working frequency to realize the regulation and control of the average value of the short-circuit current; and modulating the regulated positive and negative working pulse width and working frequency through PWM to obtain driving signals of all IGBTs in the converter. The invention improves the operation safety of the voltage-multiplying series resonant converter, can maintain the fault characteristic and is used for fault positioning.
In one embodiment of the invention, a method for suppressing a short-circuit current clamp of a voltage-multiplying series resonant converter is provided. In this embodiment, as shown in fig. 1, the method includes the following steps:
1) Acquiring output current of a converter, calculating a first difference value between a given threshold value of short-circuit current and the output current, and judging that a short-circuit fault occurs according to the first difference value;
2) When short-circuit fault occurs, positive and negative working pulse widths of input voltage of a transformer in the converter are obtained through the first difference value, and the peak value of short-circuit current is regulated and controlled by adjusting the positive and negative working pulse widths;
3) Detecting the average value of the short-circuit current, calculating a second difference value between a given threshold value of the average value of the short-circuit current and the average value of the short-circuit current, acquiring the working frequency of the converter according to the second difference value, and controlling the working frequency to realize the regulation and control of the average value of the short-circuit current;
4) And modulating the regulated positive and negative working pulse width and working frequency through PWM to obtain driving signals of all IGBTs in the converter.
In the step 1), the method for obtaining the output current of the converter includes: and a clamping diode is connected in parallel with the resonant capacitor, the cathode of the clamping diode is connected with the anode of the resonant capacitor, and the anode of the clamping diode is connected with the cathode of the resonant capacitor. When the circuit works normally, the current is output as output current after passing through the resonant capacitor; when the short circuit occurs, the voltage of the resonant capacitor is zero, and the short-circuit current flows through the clamping diode and then is output as the output current.
When the device is used, the clamping diode is used for preventing the resonance capacitor from participating in resonance, so that the impedance is increased, and the short-circuit current is automatically limited.
In step 1), the determining that the short-circuit fault occurs according to the first difference specifically includes: and when the first difference value is a negative value, the short-circuit fault is judged to occur.
Wherein the first difference value DeltaiComprises the following steps:
Figure 206875DEST_PATH_IMAGE004
(1)
in the formula (I), the compound is shown in the specification,i o in order to output the current, the current is,i f_ref a threshold is given for the short circuit current.
In the step 2), the positive and negative working pulse widths of the input voltage of the transformer are obtained through the first difference, specifically: and generating positive and negative working pulse widths after the first difference value passes through a PI controller.
The short-circuit current peak value is regulated and controlled by adjusting the positive and negative working pulse widths, and the regulation and control rule is as follows:
Figure 21247DEST_PATH_IMAGE005
(2)
in the formula (I), the compound is shown in the specification,I p in order to be the peak value of the short-circuit current,n T for the step-up ratio of the transformer in the converter,U L is the direct-current voltage at the low-voltage side of the transformer,L r in order to be a resonant inductor, the inductor,T P positive and negative working pulse widths. After the peak value regulation and control are completed,T P is a fixed value.
In the step 3), a second difference between the given threshold of the short-circuit current average value and the short-circuit current average value is calculated
Figure 843710DEST_PATH_IMAGE006
：
Figure 297694DEST_PATH_IMAGE007
(3)
In the formula (I), the compound is shown in the specification,
Figure 496594DEST_PATH_IMAGE008
a threshold value is given for the average value of the short-circuit current,
Figure 227790DEST_PATH_IMAGE003
is the short circuit current average.
The obtaining of the operating frequency of the converter from the second difference value is specifically: the second difference value outputs the working frequency after passing through a PI controllerf s 。
In the step 3), the working frequency is controlled to regulate the average value of the short-circuit current, the working frequency is regulated by regulating the zero level time, and the regulation rule is as follows:
Figure 221153DEST_PATH_IMAGE009
(4)
in the formula (I), the compound is shown in the specification,
Figure 287067DEST_PATH_IMAGE003
is the average value of the short-circuit current,f s is the switching frequency of the converter and is,i f is the short-circuit current transient value,I p in order to obtain the peak value of the short-circuit current,T d is a time of zero level and is,T P positive and negative operating pulse widths, t 0 Is the starting time.
In the step 4), the positive and negative working pulse widths of the input voltage of the transformer are specifically setT P And the operating frequency of the converterf s And sending the signals into a PWM modulator, and obtaining driving signals of the IGBTs through PWM modulation.
The embodiment is as follows:
taking the multi-voltage series resonant converter as an example, as shown in fig. 2, the topology is a three-voltage series resonant converter topology. The specific implementation steps of this embodiment include:
1) Resonant capacitorC r1 AndC r2 respectively connected in parallel with a clamping diode D c1 And D c2 Clamping diode D c1 Cathode and resonant capacitorC r1 Anode connected, clamping diode D c1 Anode and resonant capacitorC r1 Negative electrode connected, clamping diode D c2 Cathode and resonant capacitorC r2 Anode connected, clamping diode D c2 Anode and resonant capacitorC r2 The negative electrode is connected. During short circuit, the voltage of the resonant capacitor is reduced to 0, and short-circuit current flows through the clamping diode, so that the resonant capacitor is prevented from participating in resonance, impedance is increased, and the short-circuit current is automatically limited;
2) On the basis of the above-mentioned detection method, the output current of converter is detectedi o And calculating a given threshold value of the short-circuit currenti f_ref And output currenti o First difference value Δ ofi；
3) As shown in fig. 3, the short circuit current peak regulation is achieved by pulse width control. The first difference value deltaiSending the voltage to PI controller, which generates positive and negative working pulse width of input voltage of transformerT P ；
Fig. 4 shows the short circuit current path and fig. 5 shows the short circuit current diagram. By regulating positive and negative working pulse width of input voltage of transformerT P And the amplitude of the short-circuit current can be regulated and controlled.
After the regulation and control of the peak value are completed,T P is a fixed value. At the moment, the regulation and control of the short-circuit current average value are realized through frequency control. Detecting short circuit current average value
Figure 24079DEST_PATH_IMAGE003
And calculating a given threshold value of the average value of the short-circuit current
Figure 547464DEST_PATH_IMAGE008
And average value of short-circuit current
Figure 977309DEST_PATH_IMAGE003
Second difference of (2)
Figure 218934DEST_PATH_IMAGE006
. Will be different value
Figure 49050DEST_PATH_IMAGE006
Sending the frequency to PI controller, and outputting the working frequency of converter by PI controllerf s 。
Positive and negative working pulse width of transformer input voltageT P And the operating frequency of the converterf s And sending the signals into a PWM modulator, and obtaining driving signals of the IGBTs through PWM modulation. Frequency of operationf s Is actually adjusted by changing the zero level time shown in fig. 5T d The method is realized, and further the regulation and control of the average value of the short-circuit current are realized.
FIG. 6 shows a schematic diagram of an n-fold voltage series resonant converter by using a resonant capacitorC r1 AndC r2 upper respectively parallel connected clamping diode D c1 And D c2 When any n-voltage-multiplying series resonant converter is in short circuit, the clamping diode, the resonant inductor and the transformer can form a short-circuit current path shown in fig. 7, resonance of the resonant capacitor is avoided, impedance is increased, and short-circuit current is limited automatically, namely the invention has generality for the voltage-multiplying series resonant converter.
Fig. 8a to 8e are simulation diagrams of the current limiting effect using the quadruple voltage series resonant converter. As shown in fig. 8a and 8b, the primary side current of the transformer is usedi p For example, the short circuit current peak (2050A) is limited to about 1.6 times the steady state current peak (1250A). FIG. 8b, FIG. 8c and FIG. 8d are the positive and negative working pulse widths of the transformer input voltage, respectivelyT P Short-circuit current conditions at 50us, 45 us and 40 us. Namely to adjustT P The size of the short-circuit current peak value can be regulated. As can be seen by comparing figure 8b with figure 8e,T P the short-circuit current peak value is fixed when the short-circuit current peak value is fixed, and the zero level time is adjustedT d The average value of the short-circuit current can be adjusted. Simulation results confirmed the ability to limit short circuit current, as compared to equation (2)Consistent with the analysis of equation (4).
In one embodiment of the present invention, a short-circuit current clamp suppression system of a voltage-doubling series resonant converter is provided, which includes:
the fault determination module is used for acquiring the output current of the converter, calculating a first difference value between a given threshold value of the short-circuit current and the output current, and determining that the short-circuit fault occurs according to the first difference value;
the first regulating and controlling module is used for acquiring positive and negative working pulse widths of input voltage of the transformer in the converter through a first difference value when a short-circuit fault occurs, and regulating and controlling a short-circuit current peak value through regulating the positive and negative working pulse widths;
the second regulating and controlling module is used for detecting the average value of the short-circuit current, calculating a second difference value between a given threshold value of the average value of the short-circuit current and the average value of the short-circuit current, acquiring the working frequency of the converter according to the second difference value, and controlling the working frequency to realize the regulation and control of the average value of the short-circuit current;
and the output module is used for obtaining the driving signal of each IGBT in the converter after the regulated positive and negative working pulse width and the working frequency are subjected to PWM modulation.
The system provided in this embodiment is used for executing the above method embodiments, and for details of the process and the details, reference is made to the above embodiments, which are not described herein again.
In an embodiment of the present invention, a schematic structural diagram of a computing device is provided, where the computing device may be a terminal, and the computing device may include: a processor (processor), a communication Interface (communication Interface), a memory (memory), a display screen and an input device. The processor, the communication interface and the memory are communicated with each other through a communication bus. The processor is used to provide computing and control capabilities. The memory includes a non-volatile storage medium, an internal memory, the non-volatile storage medium storing an operating system and a computer program that when executed by the processor implements a throttling method; the internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The communication interface is used for carrying out wired or wireless communication with an external terminal, and the wireless communication can be realized through WIFI, a manager network, NFC (near field communication) or other technologies. The display screen can be a liquid crystal display screen or an electronic ink display screen, and the input device can be a touch layer covered on the display screen, a key, a track ball or a touch pad arranged on a shell of the computing equipment, an external keyboard, a touch pad or a mouse and the like. The processor may call logic instructions in the memory to perform the following method: acquiring output current of the converter, calculating a first difference value between a given threshold value of the short-circuit current and the output current, and judging that a short-circuit fault occurs according to the first difference value; when short-circuit fault occurs, positive and negative working pulse widths of input voltage of a transformer in the converter are obtained through the difference value, and the peak value of short-circuit current is regulated and controlled by adjusting the positive and negative working pulse widths; detecting the average value of the short-circuit current, calculating a second difference value between a given threshold value of the average value of the short-circuit current and the average value of the short-circuit current, acquiring the working frequency of the converter according to the second difference value, and controlling the working frequency to realize the regulation and control of the average value of the short-circuit current; and modulating the regulated positive and negative working pulse width and working frequency through PWM to obtain driving signals of all IGBTs in the converter.
In addition, the logic instructions in the memory may be implemented in the form of software functional units and may be stored in a computer readable storage medium when sold or used as a stand-alone product. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk, and various media capable of storing program codes.
Those skilled in the art will appreciate that the above-described configurations of computing devices are merely some of the configurations associated with the present application and do not constitute limitations on the computing devices to which the present application may be applied, as a particular computing device may include more or fewer components, or some components in combination, or have a different arrangement of components.
In one embodiment of the invention, a computer program product is provided, the computer program product comprising a computer program stored on a non-transitory computer-readable storage medium, the computer program comprising program instructions that, when executed by a computer, enable the computer to perform the methods provided by the above-described method embodiments, for example, comprising: acquiring output current of the converter, calculating a first difference value between a given threshold value of the short-circuit current and the output current, and judging that a short-circuit fault occurs according to the first difference value; when short-circuit fault occurs, positive and negative working pulse widths of input voltage of a transformer in the converter are obtained through the difference value, and the peak value of short-circuit current is regulated and controlled by adjusting the positive and negative working pulse widths; detecting the average value of the short-circuit current, calculating a second difference value between a given threshold value of the average value of the short-circuit current and the average value of the short-circuit current, acquiring the working frequency of the converter according to the second difference value, and controlling the working frequency to realize the regulation and control of the average value of the short-circuit current; and modulating the regulated positive and negative working pulse width and working frequency through PWM to obtain driving signals of all IGBTs in the converter.
In one embodiment of the invention, a non-transitory computer-readable storage medium is provided, which stores server instructions that cause a computer to perform the methods provided by the above embodiments, for example, including: acquiring output current of the converter, calculating a first difference value between a given threshold value of the short-circuit current and the output current, and judging that a short-circuit fault occurs according to the first difference value; when short-circuit fault occurs, positive and negative working pulse widths of input voltage of a transformer in the converter are obtained through the difference value, and the peak value of short-circuit current is regulated and controlled by adjusting the positive and negative working pulse widths; detecting the average value of the short-circuit current, calculating a second difference value between a given threshold value of the average value of the short-circuit current and the average value of the short-circuit current, acquiring the working frequency of the converter according to the second difference value, and controlling the working frequency to realize the regulation and control of the average value of the short-circuit current; and modulating the regulated positive and negative working pulse width and working frequency through PWM to obtain driving signals of all IGBTs in the converter.
The implementation principle and technical effect of the computer-readable storage medium provided by the above embodiments are similar to those of the above method embodiments, and are not described herein again.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (9)

1. A method for suppressing a short-circuit current clamp of a voltage-multiplying series resonant converter is characterized by comprising the following steps:
acquiring output current of a converter, calculating a first difference value between a given threshold value of short-circuit current and the output current, and judging that short-circuit fault occurs according to the first difference value;
when short-circuit fault occurs, acquiring positive and negative working pulse widths of input voltage of a transformer in the converter through the first difference value, and regulating and controlling a short-circuit current peak value by adjusting the positive and negative working pulse widths;
detecting the average value of the short-circuit current, calculating a second difference value between a given threshold value of the average value of the short-circuit current and the average value of the short-circuit current, acquiring the working frequency of the converter according to the second difference value, and controlling the working frequency to realize the regulation and control of the average value of the short-circuit current;
after the regulated positive and negative working pulse width and the working frequency are subjected to PWM modulation, a driving signal of each IGBT in the converter is obtained;
the method for acquiring the output current of the converter comprises the following steps:
a clamping diode is connected in parallel with a resonant capacitor, the cathode of the clamping diode is connected with the anode of the resonant capacitor, and the anode of the clamping diode is connected with the cathode of the resonant capacitor;
when the circuit works normally, current is output after passing through the resonant capacitor and serves as the output current;
and when the short circuit occurs, the voltage of the resonant capacitor is zero, and the short-circuit current flows through the clamping diode and then is output as the output current.
2. The method for suppressing short-circuit current clamping of a voltage-multiplying series resonant converter according to claim 1, wherein the determining that a short-circuit fault occurs according to the first difference value comprises: and when the first difference value is a negative value, judging that a short-circuit fault occurs.
3. The method for suppressing short-circuit current clamping of voltage-multiplying series resonant converter according to claim 1, wherein said obtaining positive and negative operating pulse widths of the input voltage of the transformer from said difference comprises: and generating the positive and negative working pulse width after the first difference value passes through a PI controller.
4. The method for suppressing the short-circuit current clamping of the voltage-multiplying series resonant converter according to claim 1, wherein the peak value of the short-circuit current is regulated by adjusting the positive and negative working pulse widths, and the regulation rule is as follows:
Figure FDA0003886868710000011
in the formula I p For the short-circuit current peak value, n T For step-up ratio, U, of transformers in converters L Is a low-side DC voltage of the transformer, L r Is a resonant inductor, T P The positive and negative working pulse widths.
5. The method for suppressing short-circuit current clamping of a voltage-multiplying series resonant converter according to claim 1, wherein the obtaining of the operating frequency of the converter from the second difference value comprises: and outputting the working frequency after the second difference value passes through a PI controller.
6. The method for suppressing the clamping of the short circuit current of the voltage-multiplying series resonant converter according to claim 1, wherein in the controlling of the operating frequency to realize the regulation of the average value of the short circuit current, the magnitude of the operating frequency is adjusted by adjusting the magnitude of the zero level time, and the regulation rule is as follows:
Figure FDA0003886868710000021
in the formula (I), the compound is shown in the specification,
Figure FDA0003886868710000022
is the average value of the short-circuit current, f s For the converter switching frequency, i f Is a short-circuit current instantaneous value, I p For said short-circuit current peak, T d Is the zero level time, T P For said positive and negative working pulse widths, t 0 Is the starting time.
7. A short-circuit current clamping suppression system of a voltage-multiplying series resonant converter is characterized by comprising the following components:
the fault determination module is used for acquiring the output current of the converter, calculating a first difference value between a given threshold value of the short-circuit current and the output current, and determining that the short-circuit fault occurs according to the first difference value;
the first regulating and controlling module is used for acquiring positive and negative working pulse widths of input voltage of the transformer in the converter through the first difference value when a short-circuit fault occurs, and regulating and controlling the peak value of the short-circuit current through regulating the positive and negative working pulse widths;
the second regulating and controlling module is used for detecting the average value of the short-circuit current, calculating a second difference value between a given threshold value of the average value of the short-circuit current and the average value of the short-circuit current, acquiring the working frequency of the converter according to the second difference value, and controlling the working frequency to realize the regulation and control of the average value of the short-circuit current;
the output module is used for obtaining driving signals of all IGBTs in the converter after the regulated positive and negative working pulse width and the working frequency are subjected to PWM modulation;
the method for acquiring the output current of the converter comprises the following steps:
a clamping diode is connected in parallel with a resonant capacitor, the cathode of the clamping diode is connected with the anode of the resonant capacitor, and the anode of the clamping diode is connected with the cathode of the resonant capacitor;
when the circuit works normally, current is output after passing through the resonant capacitor and is used as the output current;
and when the short circuit occurs, the voltage of the resonant capacitor is zero, and the short-circuit current flows through the clamping diode and then is output as the output current.
8. A computer readable storage medium storing one or more programs, the one or more programs comprising instructions, which when executed by a computing device, cause the computing device to perform any of the methods of claims 1-6.
9. A computing device, comprising: one or more processors, memory, and one or more programs stored in the memory and configured to be executed by the one or more processors, the one or more programs including instructions for performing any of the methods of claims 1-6.
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