CN113937992A - Alternating current power supply sudden-load detection suppression system in double-input direct current converter - Google Patents

Alternating current power supply sudden-load detection suppression system in double-input direct current converter Download PDF

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Publication number
CN113937992A
CN113937992A CN202111219633.8A CN202111219633A CN113937992A CN 113937992 A CN113937992 A CN 113937992A CN 202111219633 A CN202111219633 A CN 202111219633A CN 113937992 A CN113937992 A CN 113937992A
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voltage
converter
phase
power supply
input
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CN113937992B (en
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屠锋
蔡勇
章琳琳
费敏
张干
赵燕茹
高涛
杨卫星
於妮飒
於崇干
孙茗
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China Energy Engineering Group Zhejiang Eleteric Power Design Institute Co ltd
Eptc (beijing) Electric Power Science Research Institute
Yantai Dongfang Yokelin Electonic Co ltd
State Grid Zhejiang Electric Power Co Ltd
Hangzhou Power Supply Co of State Grid Zhejiang Electric Power Co Ltd
Original Assignee
China Energy Engineering Group Zhejiang Eleteric Power Design Institute Co ltd
Eptc (beijing) Electric Power Science Research Institute
Yantai Dongfang Yokelin Electonic Co ltd
State Grid Zhejiang Electric Power Co Ltd
Hangzhou Power Supply Co of State Grid Zhejiang Electric Power Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • 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
    • 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
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
    • H02M7/08—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode arranged for operation in parallel

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Rectifiers (AREA)

Abstract

The invention discloses an alternating current power supply sudden-load detection suppression system in a double-input direct current converter, which comprises a three-phase rectification circuit, a one-way rectification circuit and a DC/DC converter circuit; three-phase rectification circuit with positive electrodes connected in series R1Rear and filter capacitor CdcThe anode of the three-phase rectification circuit is connected with the filter capacitor CdcOf negative electrode, R1In parallel with K1; filter capacitor CdcThe anode and the cathode of the DC/DC converter are respectively connected to the DC/DC conversion circuit; the positive pole of the unidirectional rectification circuit is connected with R in series2Rear and filter capacitor CdcThe anode of the unidirectional rectifying circuit is connected with the filter capacitor CdcOf negative electrode, R2In parallel with K2. Its advantages are high effectThe control system of the DC/DC conversion circuit accurately detects the input of the high-voltage power supply, so that the negative influence of surge of the sudden power supply on the dynamic control performance of the output voltage or current of the DC/DC converter is suppressed, and the system is ensured not to generate overvoltage and overcurrent when the high-voltage power supply is suddenly input.

Description

Alternating current power supply sudden-load detection suppression system in double-input direct current converter
Technical Field
The application belongs to the field of alternating current power supply detection, and particularly relates to an alternating current power supply sudden-load detection suppression system in a double-input direct current converter.
Background
In some applications, the DC converters each have a single-phase ac input and a three-phase ac input, which are collected by respective rectifying circuits to a common DC bus for powering the subsequent DC/DC converter circuit. The two ac power supplies may or may not exist simultaneously, for example, only a single-phase ac power supply supplies power, or only a three-phase ac power supply supplies power to the DC/DC conversion circuit in the subsequent stage, or both the two ac power supplies exist simultaneously (the higher voltage supplies power to the DC/DC conversion circuit in the subsequent stage). The rectified dc voltage Vdc3 is significantly higher than the rectified dc voltage Vdc1 due to the three-phase ac power source. If only a single-phase alternating current power supply is rectified to supply power to the rear-stage DC/DC conversion circuit under the initial condition, when the three-phase alternating current power supply is suddenly switched on, because high voltage is suddenly added for inputting, if a control system of the rear-stage DC/DC conversion circuit cannot timely adjust the control quantity of the rear-stage DC/DC conversion circuit, output overvoltage or output overcurrent is caused, the system generates protection misoperation, and the normal work of the whole system is influenced. There is therefore a need for a measure that can effectively handle the above-mentioned conditions.
Disclosure of Invention
In view of the above problems, the present application provides an ac power supply inrush detection suppression system in a dual-input dc converter, which can accurately detect the input of a high-voltage power supply. The technical proposal is that the method comprises the following steps,
an alternating current power supply sudden-load detection suppression system in a double-input direct current converter comprises a three-phase rectification circuit, a one-way rectification circuit and a DC/DC converter circuit;
the anode series resistor R of the three-phase rectification circuit1Rear and filter capacitor CdcThe anode of the three-phase rectification circuit is connected with the filter capacitor CdcThe negative electrode of (1), the resistance R1And a controllable switch K1Parallel connection; the filter capacitor CdcThe positive pole and the negative pole of the DC/DC converter are respectively connected to the DC/DC converter circuit;
positive electrode series resistor R of unidirectional rectification circuit2Rear and filter capacitor CdcThe anode of the unidirectional rectifying circuit is connected with the filter capacitor CdcThe negative electrode of (1), the resistance R2And a controllable switch K2And (4) connecting in parallel.
Further preferably, the detection process of determining whether the three-phase ac voltage is input is:
assuming that the system operates under the condition of single-phase alternating-current power supply at initial time, sampling the voltage of any phase line of three-phase alternating-current input through a voltage sensor, and recording the sampling value as ubcsTo determine the instantaneous value ubcsIs greater than a preset threshold value V1th(ii) a If the instantaneous value ubcsIs greater than a threshold value V1thIt indicates that three-phase ac voltage is applied.
When the instantaneous value ubcsIs less than or equal to a threshold value V1thWhen u is overbcsAfter taking the absolute value, the absolute value is carried out sliding accumulation operation with the absolute values of the N-1 instantaneous values sampled before, and the sliding accumulation sum of the absolute values of the N instantaneous values is recorded as usumJudgment usumWhether it exceeds a preset threshold value Vth2，When the absolute value of the N sampling data is sliding accumulated and the sum usumExceeds a threshold value Vth2It shows that there is a three-phase high-voltage ac power supply input.
It is further preferred that in each sampling period the instantaneous sample value u is sampledbcsAre fed into two first low-pass filters F having different bandwidthslplAnd a second low-pass filter FlphWill pass through the first low pass filter FlplObtained ubclPerforming cycle-by-cycle accumulation and calculating the average value as VLAWill pass through a second low pass filter FlphObtained ubchPerforming cycle-by-cycle accumulation and calculating the average value as VHA(ii) a Using the obtained VLAAnd VHACalculating the proportionality coefficient Rv＝VLA/VHANormal condition Rv<1。
More preferably, when three-phase ac voltage is input, DC/DC is converted into DC/DCDC/DC converter control u in converter circuitmMultiplying by a scaling factor RvThen sending the voltage into a DC/DC converter control system, and controlling the DC/DC converter control quantity u under the condition that the sudden input of the three-phase alternating voltage is not detectedmMultiplying by 1 and sending to a DC/DC converter control system for duty ratio regulation.
Further preferably, V is set during the three-phase ac power supply is put into and stabilizedLAWill gradually approach until it equals VHAThus, when the three-phase AC power supply input is detected and delayed for a period of time tdThereafter, the DC/DC converter control system is restored to control signal umAnd multiplying by 1, and performing PWM modulation, namely recovering the system to a normal operation state.
Further preferably, the DC/DC converter circuit outputs a voltage reference uorefAnd the actual output voltage uoIs fed to the voltage controller GvTo obtain a control signal umUnder steady state conditions, if the DC/DC converter control system does not detect sudden input of three-phase alternating current high voltage, the control signal umMultiplying by 1, and then modulating with a high-frequency carrier CW to obtain a PWM signal; if the control system detects the sudden input of the three-phase alternating-current high voltage, the DC/DC converter control system calculates a proportionality coefficient R for correctionvControl signal umAnd RvAfter multiplication, the signal is used for modulating with a high-frequency carrier wave CW and waiting for a PWM signal.
Advantageous effects
1) The method for detecting whether the three-phase high-voltage alternating-current power supply is put into use by using one voltage sensor reduces the number of the sensors and saves the cost.
2) The control method which is suitable for the high-power direct-current converter and does not require high control bandwidth is provided, the design difficulty of a direct-current converter control system is reduced, and the rapidity is good.
3) Closing K by control system at end of power-on1R is to be1And the bypass is used for avoiding loss and pressure drop. Similarly, K is closed through the control system at the end of electrification2R is to be2And the bypass is used for avoiding loss and pressure drop.
4) The input of the high-voltage power supply is accurately detected by a control system of the DC/DC converter circuit, so that the negative influence of the surge of the sudden power supply on the dynamic control performance of the output voltage or current of the DC/DC converter is suppressed, and the phenomena of overvoltage and overcurrent are avoided when the high-voltage power supply is suddenly input.
Drawings
Fig. 1 is a schematic diagram of the present application.
FIG. 2 is a schematic diagram of a single closed loop control system of the DC/DC conversion circuit.
FIG. 3 is a graph showing a proportional correction factor RvSchematic diagram of the calculation method of (1).
Detailed Description
The following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. 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 example embodiments according to the present application.
The schematic diagram of the topology of the dual-input DC converter described in the patent of fig. 1 integrally includes a three-phase half-bridge diode rectifier circuit, a single-phase full-bridge diode rectifier circuit, and a DC/DC converter circuit.
Input of three-phase half-bridge diode rectifying circuit is connected with three-phase alternating current power supply ua，ubAnd ucPositive series resistance R of its rectified output1Rear and filter capacitor CdcThe anode A of the rectifier is connected with the point A, and the cathode of the rectifier output is connected with the filter capacitor CdcPoint B of the negative electrode. Resistance R1For limiting the inrush current of a three-phase alternating current, with a controllable switch K1In parallel connection, the power-on is closed by a control system K1R is to be1And the bypass is used for avoiding loss and pressure drop.
Input of single-phase full-bridge diode rectifying circuit is connected with single-phase alternating current power supply uePositive series resistance R of its rectified output2Rear and filter capacitor CdcThe anode A point of the rectifier is connected, and the cathode of the rectifier output is connected with the filterWave capacitor CdcPoint B of the negative electrode. Resistance R2For limiting the inrush current on single-phase alternating current, with a controllable switch K2In parallel connection, the power-on is closed by a control system K2R is to be2And the bypass is used for avoiding loss and pressure drop.
In order to detect the single-phase alternating-current voltage, a voltage sensor VS1 is arranged at the midpoint of two bridge arms of the single-phase full-bridge diode rectifying circuit; to detect the three-phase ac voltage, any two phases of the three-phase arm (e.g., the midpoint of the b-phase arm and the c-phase arm in fig. 1) are selected, and a voltage sensor VS2 is disposed at the midpoint of the two-phase arm.
Generally, Vdc1 is 0.9 times the input voltage of the unidirectional rectifying circuit, and Vdc3 is 2.34 times the input voltage of the three-phase rectifying circuit.
The DC/DC converter circuit of the subsequent stage may be in any circuit form of an isolated or non-isolated structure, such as a non-isolated Buck circuit, a Boost circuit, or a phase-shifted full-bridge converter circuit of an isolated structure.
The DC/DC converter circuit of the later stage can adopt voltage single closed-loop control or voltage current double closed-loop control. Fig. 2 shows a schematic diagram of a single closed loop control using voltage to assist in explaining the main concepts of the present patent. Reference value u of output voltageorefAnd the actual output voltage uoIs fed to the voltage controller GvTo obtain a control signal umIn steady state conditions, i.e. if the DC/DC converter control system does not detect a sudden input of a three-phase ac high voltage, the control signal umMultiplying by 1, and then modulating with a high-frequency carrier CW to obtain a PWM signal; if the control system detects the sudden input of the three-phase alternating-current high voltage, the DC/DC converter control system calculates a proportionality coefficient R for correctionvControl signal umAnd RvAfter multiplication, the signal is used for modulating with a high-frequency carrier wave CW and waiting for a PWM signal.
The method for detecting the three-phase high-voltage alternating current sudden addition and suppressing the impact in the dual-input direct current converter comprises the following steps:
(1) assuming that the system is initially in the single-phase AC power supply barAnd (4) running under the condition of one piece. Sampling any phase line voltage of three-phase AC input (e.g., u in FIG. 1) by voltage sensor VS2bc) The sampled value is denoted as ubcsTo determine the instantaneous value ubcsWhether the absolute value of (b) exceeds a preset threshold value V1th(e.g., average voltage of single-phase rectified output); if ubcsIs greater than V1thIt indicates that three-phase ac voltage is applied. Otherwise, no three-phase alternating voltage is input;
(2) if it is judged that no three-phase ac voltage is input based on the detection in (1), u is addedbcsAnd taking the absolute value of the N-1 instantaneous values sampled before and after the absolute value to carry out sliding accumulation operation. In order to ensure real-time detection, the time for continuously sampling N data is not too long, and may be controlled to be about 1ms, for example, the sampling frequency is 20kHz (corresponding to a sampling period of 50 μ s), the frequency of the three-phase ac power supply is 50Hz (corresponding to a period of 20ms), and 1ms may sample 20 data. The sliding accumulation is adopted to ensure that a calculation result meeting the real-time requirement can be quickly obtained in each sampling period. The sliding accumulation sum of the absolute values of the N instantaneous values is recorded as usum；
(3) Judgment usumWhether it exceeds a preset threshold value Vth2. Under normal conditions, if no three-phase high-voltage alternating-current power supply is put into use, theoretically, the instantaneous sampling value is 0, in an actual system, interference is caused by high-frequency PWM chopping of a power device in a DC/DC converter circuit, and the absolute value sliding accumulation of N sampling data is smaller than a threshold value Vth2. When the sliding accumulation sum of the absolute values of the N sampling data exceeds Vth2Then it can be judged that there is a three-phase high-voltage ac power supply input. The method can avoid the defect that the method for calculating the voltage change rate by using the sampling instantaneous value is easy to interfere, and has the advantages of stability and reliability.
In the case where only one voltage sensor is provided for checking sudden input of the three-phase ac power supply, it is determined whether or not the three-phase ac voltage is input by combining the absolute value of the instantaneous voltage value with the sum of the absolute values of N-point sampling data in a short time (e.g., 1 ms). Namely: on one hand, judging whether the absolute value of the sampling instantaneous value exceeds a preset threshold value V1th, and if so, judging that three-phase alternating voltage is input; on the other hand, since one voltage sensor can only detect one phase voltage, it may happen that the voltage of the detected phase is low (near the zero crossing point), while in reality the voltages of the other two phases are already high and exceed the threshold value Vth1, resulting in failure to detect the input of the three-phase high-voltage ac power in time. Therefore, a detection method for performing sliding accumulation after absolute values of instantaneous values of multiple points (assuming that N data are sampled in 1ms) in a short time is provided, under a normal condition, because no three-phase high-voltage alternating-current power supply is switched on, a theoretical sampling value is 0, interference is caused by high-frequency PWM chopping of a power device in an actual direct-current converter, the sliding accumulation of the absolute values of the N sampled data is smaller than a threshold value Vth2, and when the sliding accumulation sum of the absolute values of the N sampled data exceeds Vth2, the switching on of the three-phase high-voltage alternating-current power supply can be judged. Therefore, the method for calculating the voltage change rate by using the sampled instantaneous value can avoid the defect that the method is easily interfered, and has the advantages of stability and reliability.
(4) In each sampling period, the instantaneous sampling value ubcsAre fed into a first low-pass filter F respectivelylplAnd a second low-pass filter FlphThe former, FlplHaving a relatively low bandwidth (e.g. below 50 Hz) is a low bandwidth low pass filter, the latter FlphHaving a relatively high bandwidth (e.g. 3kHz, well above F)lplIs significantly lower than the switching frequency of the dc converter), is a high bandwidth low pass filter, will pass FlplObtained ubclPerforming cycle-by-cycle accumulation and calculating the average value as VLAWill pass through FlphObtained ubchPerforming cycle-by-cycle accumulation and calculating the average value as VHA. Relative to VHA，VLAIs a slow variable, and VHAThe dynamic change of the average value of the alternating current voltage rectifying is better reflected. Using the obtained VLAAnd VHACalculating the proportionality coefficient Rv＝VLA/VHA. Due to VLAIs a relatively slow variable and normally must have Rv<1 is true;
when the three-phase alternating current is judged by the (1), (2) and (3)When the voltage is applied, the DC/DC converter is controlled by a control value umMultiplying by the scaling factor R obtained in (4)vAnd then the voltage is sent to a comparison register of a microprocessor of a DC/DC converter control system, so that the quick response to the sudden change of the input voltage is realized, and the purpose of inhibiting the voltage impact caused when the three-phase high-voltage alternating-current power supply is suddenly switched on is achieved. Controlling the DC/DC converter by a control value u when the sudden input of the three-phase alternating voltage is not detectedmMultiplying by 1, and sending the result to a comparison register of a microprocessor of a DC/DC converter control system for duty ratio adjustment.
In theory, V is in the process of inputting and stabilizing three-phase alternating current power supplyLAWill gradually approach until it equals VHAThus, when the three-phase AC power supply input is detected and delayed for a period of time td(e.g. over several sine wave periods, e.g. 100ms) the control system reverts to the control signal umAnd multiplying by 1, and performing PWM modulation, namely recovering the system to a normal operation state.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (7)

1. An alternating current power supply sudden-load detection suppression system in a double-input direct current converter is characterized by comprising a three-phase rectification circuit, a one-way rectification circuit and a DC/DC converter circuit;
the anode series resistor R of the three-phase rectification circuit1Rear and filter capacitor CdcThe anode of the three-phase rectification circuit is connected with the filter capacitor CdcThe negative electrode of (1), the resistance R1And a controllable switch K1Parallel connection; the filter capacitor CdcThe positive pole and the negative pole of the DC/DC converter are respectively connected to the DC/DC converter circuit;
positive electrode series resistor R of unidirectional rectification circuit2Rear and filter capacitor CdcPositive electrode connection of (2), unidirectional rectificationNegative pole of current circuit is connected with filter capacitor CdcThe negative electrode of (1), the resistance R2And a controllable switch K2And (4) connecting in parallel.
2. The system for suppressing the sudden addition of the alternating current power supply in the dual-input direct current converter as claimed in claim 1, wherein the detection process for judging whether the three-phase alternating current voltage is input is as follows:
assuming that the system operates under the condition of single-phase alternating-current power supply at initial time, sampling the voltage of any phase line of three-phase alternating-current input through a voltage sensor, and recording the sampling value as ubcsTo determine the instantaneous value ubcsIs greater than a preset threshold value V1th(ii) a If the instantaneous value ubcsIs greater than a threshold value V1thIt indicates that three-phase ac voltage is applied.
3. The system for suppressing the sudden addition of the alternating-current power supply in the dual-input direct-current converter according to claim 2, wherein the detection process for judging whether the three-phase alternating-current voltage is input is as follows:
when the instantaneous value ubcsIs less than or equal to a threshold value V1thWhen u is overbcsAfter taking the absolute value, the absolute value is carried out sliding accumulation operation with the absolute values of the N-1 instantaneous values sampled before, and the sliding accumulation sum of the absolute values of the N instantaneous values is recorded as usumJudgment usumWhether it exceeds a preset threshold value Vth2，When the absolute value of the N sampling data is sliding accumulated and the sum usumExceeds a threshold value Vth2It shows that there is a three-phase high-voltage ac power supply input.
4. The system of claim 2, wherein the instantaneous sample value u is sampled every sampling periodbcsAre fed into two first low-pass filters F having different bandwidthslplAnd a second low-pass filter FlphWill pass through the first low pass filter FlplObtained ubclPerforming cycle-by-cycle accumulation and averagingA value of VLAWill pass through a second low pass filter FlphObtained ubchPerforming cycle-by-cycle accumulation and calculating the average value as VHA(ii) a Using the obtained VLAAnd VHACalculating the proportionality coefficient Rv＝VLA/VHANormal condition Rv<1。
5. The system of claim 4, wherein the control amount u of the DC/DC converter in the DC/DC converter circuit is controlled when three-phase AC voltage is appliedmMultiplying by a scaling factor RvThen sending the voltage into a DC/DC converter control system, and controlling the DC/DC converter control quantity u under the condition that the sudden input of the three-phase alternating voltage is not detectedmMultiplying by 1 and sending to a DC/DC converter control system for duty ratio regulation.
6. The system for suppressing AC power supply overshoot detection in a dual input DC converter according to claim 4,
in the process of inputting and stabilizing the three-phase alternating current power supply, VLAWill gradually approach until it equals VHAThus, when the three-phase AC power supply input is detected and delayed for a period of time tdThereafter, the DC/DC converter control system is restored to control signal umAnd multiplying by 1, and performing PWM modulation, namely recovering the system to a normal operation state.
7. The system of claim 1, wherein the DC/DC converter circuit outputs a voltage reference uorefAnd the actual output voltage uoIs fed to the voltage controller GvTo obtain a control signal umUnder steady state conditions, if the DC/DC converter control system does not detect sudden input of three-phase alternating current high voltage, the control signal umMultiplying by 1, and then modulating with a high-frequency carrier CW to obtain a PWM signal; if the control system detects three-phase trafficWhen the high voltage is suddenly applied, the DC/DC converter control system calculates a proportionality coefficient R for correctionvControl signal umAnd RvAfter multiplication, the signal is used for modulating with a high-frequency carrier wave CW and waiting for a PWM signal.
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