CN112737394A - Control method for special power supply device - Google Patents
Control method for special power supply device Download PDFInfo
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- CN112737394A CN112737394A CN202011601663.0A CN202011601663A CN112737394A CN 112737394 A CN112737394 A CN 112737394A CN 202011601663 A CN202011601663 A CN 202011601663A CN 112737394 A CN112737394 A CN 112737394A
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal 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
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal 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, e.g. single switched pulse inverters
- H02M7/539—Conversion of dc power input into ac power output without possibility of reversal 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, e.g. single switched pulse inverters with automatic control of output wave form or frequency
- H02M7/5395—Conversion of dc power input into ac power output without possibility of reversal 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, e.g. single switched pulse inverters with automatic control of output wave form or frequency by pulse-width modulation
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Abstract
The invention belongs to the technical field of special power supply of power electronics, and particularly relates to a control method of a special power supply device, which comprises the following steps: step 1, simulating a triangular carrier generator of a PWM controller to generate a triangular carrier with fixed frequency at any moment; step 2, carrying out loop control on the digital controller; step 3, converting the three-phase alternating current digital signal output in the step 2 into a three-phase analog signal by a digital-to-analog converter (DAC); and 4, performing pulse width modulation on the analog PWM controller according to the three-phase analog signal output by the digital-to-analog converter DAC in the step 3. The method greatly improves the consistency, flexibility and stability of the uranium enrichment variable frequency power supply, has the advantages of higher precision, lower system delay and faster transient response, and lays a solid technical foundation for a high-power parallel system.
Description
Technical Field
The invention belongs to the technical field of special power supplies of power electronics, and particularly relates to a control method of a special power supply device.
Background
At first, most uranium enrichment variable frequency power supplies adopt a square wave inversion control strategy, and the circuit is simple and low in price. The voltage regulation method has the defects of narrow voltage regulation range and large noise, the quality of square wave alternating current output by the square wave inverter is poor and unstable, the positive maximum value to the negative maximum value can be generated, and the load and the inverter can be strongly unstable and overheated or devices can be damaged after long-term operation. Harmonic components in the output voltage generate additional loss when an inductive load is carried, and electromagnetic interference is large, so that the square wave inversion technology gradually exits from a stage, and the sine wave inversion technology becomes the mainstream of the alternating current power supply control technology by virtue of the advantages of good output waveform, low distortion, small interference, good performance and the like. The sine wave inversion technology has two realization schemes of analog and digital, and the PWM framework has the outstanding advantages of fast dynamic response and high precision due to analog control pulse width modulation, but the analog control integration level is low, the flexibility is poor, certain difference can be generated on the control due to the consistency difference of discrete devices such as resistance capacitance, the debugging process is complex, and the large-scale production and debugging are not facilitated. With the development of the digital technology, more and more system developers adopt the digital technology, and the digital technology has online programmable capability, can conveniently and quickly realize multi-loop advanced control algorithm and excellent system management and interconnection functions. Digital control solutions allow a single processor to work with individually customized software to meet the requirements of each power stage, and the economic size of the product can be very large on a large scale. However, the digital control introduces a delay of 0.5-1.0Ts (switching period), which causes the problems of reduced system bandwidth, slow dynamic response, no gain improvement, reduced system stability, etc., and for the digital PWM, in order to achieve the same performance index as the analog control architecture, a high-resolution, high-speed and linear analog-to-digital converter ADC and a high-resolution, high-speed PWM circuit are required, so the cost compared with the analog control architecture is increased greatly.
Therefore, it is desirable to provide a control method for a dedicated power supply device to solve the problems of the prior art.
Disclosure of Invention
The invention aims to provide a special power supply device control method, which combines analog Pulse Width Modulation (PWM) with digital control, provides all performances of the digital control under the condition of not sacrificing the PWM precision and infinite resolution of the analog control, improves the consistency, flexibility and stability of a uranium enriched variable frequency power supply, and simultaneously has the advantages of higher resolution, lower system delay and faster transient response.
The technical scheme for realizing the purpose of the invention is as follows:
a control method of a special power supply device comprises the following steps:
step 1, simulating a triangular carrier generator of a PWM controller to generate a triangular carrier with fixed frequency at any moment;
step 2, carrying out loop control on the digital controller;
step 3, converting the three-phase alternating current digital signal output in the step 2 into a three-phase analog signal by a digital-to-analog converter (DAC);
and 4, performing pulse width modulation on the analog PWM controller according to the three-phase analog signal output by the digital-to-analog converter DAC in the step 3.
The triangular carrier generator in the step 1 consists of a hysteresis comparator and an integrating circuit, wherein the hysteresis circuit generates square waves, and the integrating circuit integrates the square waves to output triangular waves.
The circuit connection of the triangular carrier wave generator in the step 1 is that the negative input of an operational amplifier A1 is grounded, the positive input series resistor R2 is connected to the resistor R4 of the output pin of an operational amplifier A1, the pin of the resistor R4 is connected with a voltage regulator tube in series and is grounded, the output pin of an operational amplifier A1 is connected with the R4 and the R3 in series and is connected to the negative input of the operational amplifier A2, the negative input series capacitor C of an operational amplifier A2 is connected to the output pin of the operational amplifier A2, the positive input series resistor R5 of the operational amplifier A2 is grounded, the output pin series resistor R1 of the operational amplifier A2 is connected to the positive input of the operational amplifier A1, and the output pin of the operational amplifier A2 is connected to the negative.
The amplitude of the triangular carrier wave in the step 1 is as follows:
wherein U iszIs the voltage of a voltage regulator tube;
uofrom OV to WomThe time required is
Therefore, it is not only easy to use
The period and frequency of the triangular carrier wave in the step 1 are as follows:
the step 2 comprises the following steps:
step 2.1, initializing a clock peripheral, a Pulse Width Modulation (PWM) peripheral, a general input/output interface gpio peripheral, a serial communication sci peripheral and an analog-to-digital conversion (ADC) peripheral of a Digital Signal Processor (DSP)/MCU;
2.2, the DSP/MCU communicates with the human-computer interaction HMI to receive the setting and starting and stopping operation commands of loop control parameters, and after the parameter configuration is finished, the ADC is started to interrupt;
step 2.3, after the high-speed analog-to-digital converter ADC is interrupted, the digital controller completes digital conversion of analog signals of the inductive current, the output voltage and the output current analog signals collected by the Hall through the external equipment of the internal analog-to-digital converter ADC;
step 2.4, the DSP/MCU realizes clarke transformation of alternating current digital signals of three-phase output voltage and output current through software codes, the clarke transformation converts three-phase coordinate axes into a static alpha beta coordinate system, and then the three-phase coordinate axes are converted into a rotating dq coordinate system through park transformation based on the static alpha beta coordinate system, so that the alternating current digital feedback signals are converted into direct current feedback digital signals, and accurate control of a digital control loop is facilitated;
step 2.5, based on the direct current feedback digital signal in the step 2.4, starting PI regulator control of a voltage outer ring, taking the output of the voltage outer ring regulator as a given input signal of a current inner ring, and then carrying out PI regulator control of the current inner ring;
step 2.6, inverse park conversion is carried out on the output of the PI regulator of the current inner loop in the step 2.5, the output direct current digital signal is inversely converted into a signal based on a static alpha beta coordinate system, and the converted signal of the alpha beta coordinate system is converted into an alternating current three-phase digital signal through inverse clarke conversion, so that the direct current signal output by loop control is restored to an alternating current digital signal under a three-phase coordinate system, and the control of the analog PWM controller is facilitated;
step 2.7, the three-phase digital signals in the step 2.6 are sent to the input of a digital-to-analog converter DAC through data bus communication;
and 2.8, after the DSP/MCU exits the analog-to-digital conversion interruption, entering a main circulation flow, calculating the output voltage, the output current and the power of the power supply, performing fault judgment and protection logic according to the real-time state and the output information of the power supply, and transmitting the calculated numerical value to the human-computer interaction HMI for displaying in a serial SCI communication mode.
The step 4 comprises the following steps:
step 4.1, the positive input end of the comparator is the analog signal output by the digital-to-analog converter DAC in the step 3, the negative input end of the comparator is the triangular carrier output in the step 1, and the comparator compares the signals according to the positive input end and the negative input end and outputs a Pulse Width Modulation (PWM) wave;
and 4.2, inverting the IGBT action of the switching tube of the pulse width modulation PWM wave control device output in the step 4.1, thereby realizing the control of the output voltage.
The invention has the beneficial technical effects that:
(1) the invention adopts 'analog + DSP/MCU digital' mixed control, the digital signal processor DSP/MCU digital control completes complex dq transformation double-loop control loop, communication interconnection and input signal analog-to-digital conversion functions, the analog control completes pulse width modulation PWM comparison generation, the precision and infinite resolution characteristic of the pulse width modulation PWM are ensured, and the self time delay of a digital control system is greatly reduced.
(2) The present invention provides all the performance of digital control without sacrificing the Pulse Width Modulation (PWM) accuracy and infinite resolution of analog control.
(3) The method greatly improves the consistency, flexibility and stability of the uranium enrichment variable frequency power supply, has the advantages of higher precision, lower system delay and faster transient response, and lays a solid technical foundation for a high-power parallel system.
Drawings
Fig. 1 is a schematic diagram of a triangular carrier generation circuit provided in the present invention;
Detailed Description
In order to make those skilled in the art better understand the present invention, the technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention. It should be apparent that the embodiments described below are only some, but not all, of the embodiments of the present invention. All other embodiments that can be derived by a person skilled in the art from the embodiments described herein without inventive step are within the scope of the present invention.
The invention provides a control method of a special power supply device, which comprises the following steps:
step 1, simulating a triangular carrier generator of a PWM controller to generate a triangular carrier with fixed frequency at any moment;
as shown in FIG. 1, the triangular carrier generator comprises a hysteresis comparator and an integrating circuit, wherein the hysteresis circuit generates a square wave, the integrating circuit integrates the square wave to output a triangular wave, and an operational amplifier A1Negative input grounded and positive input series resistor R2Is connected to an operational amplifier A1Resistance R of output pin4Resistance R4The pin is connected with a voltage regulator tube in series and is grounded,operational amplifier A1Output pin series connection R4、R3The resistor is connected to the operational amplifier A2Negative input of (A), operational amplifier (A)2Is connected to the operational amplifier A2Output pin of, operational amplifier A2Positive input series resistance R5Grounding, operational amplifier A2Output pin series resistor R1Is connected to an operational amplifier A1Positive input of (A), operational amplifier (A)2The output pin is connected to the negative input end of the analog PWM controller comparator;
the amplitude of the triangular carrier wave is as follows:
wherein U iszIs the voltage of a voltage regulator tube;
uofrom OV to uomThe time required is
Therefore, it is not only easy to use
Combining the formula I and the formula II to obtain the period and the frequency of the triangular carrier wave:
step 2, carrying out loop control on the digital controller;
step 2.1, initializing a clock peripheral, a Pulse Width Modulation (PWM) peripheral, a general input/output interface gpio peripheral, a serial communication sci peripheral and an analog-to-digital conversion (ADC) peripheral of a Digital Signal Processor (DSP)/MCU;
2.2, the DSP/MCU communicates with the human-computer interaction HMI to receive the setting and starting and stopping operation commands of loop control parameters, and after the parameter configuration is finished, the ADC is started to interrupt;
step 2.3, after the high-speed analog-to-digital converter ADC is interrupted, the digital controller collects inductive current, output voltage and output current signals through the Hall, analog-to-digital conversion of the signals is completed through an internal analog-to-digital converter ADC module, after signal digitization is completed, a program starts to perform Clarke/Park conversion on digital feedback information of the voltage and the current, and alternating current feedback signals are converted into direct current digital signals of a dq axis;
step 2.4, starting PI regulator control of a voltage outer ring based on the dq-axis direct-current digital signal in the step 2.3, taking the output of the voltage outer ring regulator as a given input signal of a current inner ring, and then carrying out PI regulator control of the current inner ring;
step 2.5, carrying out iPadk \ iClarke transformation on the output of the PI regulator of the current inner ring in the step 2.4, carrying out inverse transformation on the dq-axis direct current signal into a three-phase alternating current digital signal, and transmitting the digital signal to the input of a digital-to-analog converter (DAC) through data bus communication;
and 2.6, after the DSP/MCU exits the analog-to-digital conversion interruption, entering a main circulation flow, calculating the output voltage, the output current and the power of the power supply, performing fault judgment and protection logic according to the real-time state and the output information of the power supply, and transmitting the calculated numerical value to the human-computer interaction HMI for displaying in a serial SCI communication mode.
Step 3, converting the digital signal of the three-phase alternating current output in the step 2.5 into a three-phase analog signal by a digital-to-analog converter (DAC);
and 4, performing pulse width modulation on the analog PWM controller according to the three-phase analog signal output by the digital-to-analog converter DAC.
Step 4.1, inputting the analog signal output by the DAC in the step 3 into the positive input end of the comparator, and inputting the triangular carrier output in the step 1 into the negative input end of the comparator;
step 4.2, the comparator compares the signals of the positive input end and the negative input end and outputs a Pulse Width Modulation (PWM) wave;
and 4.3, inverting the IGBT action of the switching tube of the pulse width modulation PWM wave control device output in the step 4.2, thereby realizing the control of the output voltage.
The present invention has been described in detail with reference to the drawings and examples, but the present invention is not limited to the examples, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present invention. The prior art can be adopted in the content which is not described in detail in the invention.
Claims (7)
1. A control method of a special power supply device is characterized in that: the method comprises the following steps:
step 1, simulating a triangular carrier generator of a PWM controller to generate a triangular carrier with fixed frequency at any moment;
step 2, carrying out loop control on the digital controller;
step 3, converting the three-phase alternating current digital signal output in the step 2 into a three-phase analog signal by a digital-to-analog converter (DAC);
and 4, performing pulse width modulation on the analog PWM controller according to the three-phase analog signal output by the digital-to-analog converter DAC in the step 3.
2. The special power supply device control method according to claim 1, characterized in that: the triangular carrier generator in the step 1 consists of a hysteresis comparator and an integrating circuit, wherein the hysteresis circuit generates square waves, and the integrating circuit integrates the square waves to output triangular waves.
3. The special power supply device control method according to claim 2, characterized in that: the circuit connection of the triangular carrier wave generator in the step 1 is that the negative input of an operational amplifier A1 is grounded, the positive input series resistor R2 is connected to the resistor R4 of the output pin of an operational amplifier A1, the pin of the resistor R4 is connected with a voltage regulator tube in series and is grounded, the output pin of an operational amplifier A1 is connected with the R4 and the R3 in series and is connected to the negative input of the operational amplifier A2, the negative input series capacitor C of an operational amplifier A2 is connected to the output pin of the operational amplifier A2, the positive input series resistor R5 of the operational amplifier A2 is grounded, the output pin series resistor R1 of the operational amplifier A2 is connected to the positive input of the operational amplifier A1, and the output pin of the operational amplifier A2 is connected to the negative.
4. The special power supply device control method according to claim 3, characterized in that: the amplitude of the triangular carrier wave in the step 1 is as follows:
wherein U iszIs the voltage of a voltage regulator tube;
uofrom 0V up to uomThe time required is
Therefore, it is not only easy to use
5. The special power supply device control method according to claim 4, characterized in that: the period and frequency of the triangular carrier wave in the step 1 are as follows:
6. the special power supply device control method according to claim 5, characterized in that: the step 2 comprises the following steps:
step 2.1, initializing a clock peripheral, a Pulse Width Modulation (PWM) peripheral, a general input/output interface gpio peripheral, a serial communication sci peripheral and an analog-to-digital conversion (ADC) peripheral of a Digital Signal Processor (DSP)/MCU;
2.2, the DSP/MCU communicates with the human-computer interaction HMI to receive the setting and starting and stopping operation commands of loop control parameters, and after the parameter configuration is finished, the ADC is started to interrupt;
step 2.3, after the high-speed analog-to-digital converter ADC is interrupted, the digital controller completes digital conversion of analog signals of the inductive current, the output voltage and the output current analog signals collected by the Hall through the external equipment of the internal analog-to-digital converter ADC;
step 2.4, the DSP/MCU realizes clarke transformation of alternating current digital signals of three-phase output voltage and output current through software codes, the clarke transformation converts three-phase coordinate axes into a static alpha beta coordinate system, and then the three-phase coordinate axes are converted into a rotating dq coordinate system through park transformation based on the static alpha beta coordinate system, so that the alternating current digital feedback signals are converted into direct current feedback digital signals, and accurate control of a digital control loop is facilitated;
step 2.5, based on the direct current feedback digital signal in the step 2.4, starting PI regulator control of a voltage outer ring, taking the output of the voltage outer ring regulator as a given input signal of a current inner ring, and then carrying out PI regulator control of the current inner ring;
step 2.6, inverse park conversion is carried out on the output of the PI regulator of the current inner loop in the step 2.5, the output direct current digital signal is inversely converted into a signal based on a static alpha beta coordinate system, and the converted signal of the alpha beta coordinate system is converted into an alternating current three-phase digital signal through inverse clarke conversion, so that the direct current signal output by loop control is restored to an alternating current digital signal under a three-phase coordinate system, and the control of the analog PWM controller is facilitated;
step 2.7, the three-phase digital signals in the step 2.6 are sent to the input of a digital-to-analog converter DAC through data bus communication;
and 2.8, after the DSP/MCU exits the analog-to-digital conversion interruption, entering a main circulation flow, calculating the output voltage, the output current and the power of the power supply, performing fault judgment and protection logic according to the real-time state and the output information of the power supply, and transmitting the calculated numerical value to the human-computer interaction HMI for displaying in a serial SCI communication mode.
7. The special power supply device control method according to claim 6, characterized in that: the step 4 comprises the following steps:
step 4.1, the positive input end of the comparator is the analog signal output by the digital-to-analog converter DAC in the step 3, the negative input end of the comparator is the triangular carrier output in the step 1, and the comparator compares the signals according to the positive input end and the negative input end and outputs a Pulse Width Modulation (PWM) wave;
and 4.2, inverting the IGBT action of the switching tube of the pulse width modulation PWM wave control device output in the step 4.1, thereby realizing the control of the output voltage.
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