CN113437889A - Three-phase three-level high-power-factor rectifying device and method - Google Patents
Three-phase three-level high-power-factor rectifying device and method Download PDFInfo
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- CN113437889A CN113437889A CN202110842944.3A CN202110842944A CN113437889A CN 113437889 A CN113437889 A CN 113437889A CN 202110842944 A CN202110842944 A CN 202110842944A CN 113437889 A CN113437889 A CN 113437889A
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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
- H02M7/02—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
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc 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
- H02M7/217—Conversion of ac power input into dc 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
- H02M7/2173—Conversion of ac power input into dc 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 in a biphase or polyphase circuit arrangement
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
- H02M1/4233—Arrangements for improving power factor of AC input using a bridge converter comprising active switches
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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
- H02M7/02—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
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc 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
- H02M7/217—Conversion of ac power input into dc 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
- H02M7/219—Conversion of ac power input into dc 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 in a bridge configuration
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- 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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Abstract
The invention discloses a three-phase three-level high-power-factor rectifying device and a method. The microcontroller module is used as a core control module and controls the driving circuit module in real time to realize the on-off of the switching tube; the driving circuit amplifies signals of the main control I/O port and plays a role in cooperation with the microcontroller module; the sampling circuit is an analog signal circuit and is used for sampling the direct current side capacitor voltage, the three-phase alternating current network line voltage and the current respectively; the auxiliary power supply module provides corresponding voltage for each part of the system. On the basis of continuing the advantages of low harmonic content, high withstand voltage level and the like of the traditional three-level rectifier, the capacitance midpoint balance algorithm of the invention has the advantages of balanced voltage division and the like in the aspect of inhibiting midpoint potential fluctuation.
Description
Technical Field
The invention relates to the technical field of rectifiers, in particular to a three-phase three-level high-power-factor rectifying device and a three-phase three-level high-power-factor rectifying method.
Background
Most of the traditional rectifiers consist of a rectifier transformer and a diode rectifier bridge or a phase-controlled thyristor rectifier bridge, so that the power factor at the network side is low, the harmonic content is high, and serious pollution is caused to a power grid. The multi-level PWM rectifier has low requirement on the withstand voltage of the switching device, and has the advantage that the harmonic content under the same switching frequency is much smaller than that of the two-level PWM rectifier, so that the multi-level PWM rectifier gradually becomes a research hotspot of the power electronic device in the application occasions of high voltage and high power in recent years.
Diode clamped rectifiers (NPC) were first introduced by akrra Nabae et al in 1980. Fig. 2 is a topological diagram of a single-phase bridge arm of a diode-clamped rectifier, and fig. 3 is a complete topological diagram of the diode-clamped rectifier, which comprises three bridge arms, wherein each bridge arm is connected with two clamping diodes after four fully-controlled switching tubes are connected in series, the middle point of each diode is connected with the middle points of two identical capacitors on a direct current side, and the sum of the voltages of the two capacitors is the voltage on the direct current side. Although this topology is relatively simple, there are also significant problems, of which the mid-point balancing problem is a major problem: in an actual circuit, the capacitors on both sides of the direct current side cannot be completely the same, the charging and discharging processes are always different, and the midpoint potential is unbalanced due to the difference between the upper voltage and the lower voltage. The problem of fluctuation of the midpoint potential is taken as a core problem of a diode-clamped rectifier and is directly related to whether the rectifier can normally operate: when the midpoint potential fluctuates, the service life of the capacitor is greatly shortened due to unbalanced voltage division of the direct-current side capacitor, low-order harmonic waves are caused on the alternating-current side, the requirements of green and high power factor of a power system are not met, and meanwhile the working efficiency of the rectifier is also reduced. In addition, only when the voltage of the capacitor on the direct current side is balanced, the voltage stress born by the switching tube keeps balanced, and the service life of the switching device can be guaranteed.
Disclosure of Invention
In view of the above-mentioned deficiencies of the prior art, the present invention provides a three-phase three-level high power factor rectifier device.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a three-phase three-level high power factor rectifying device comprises a rectifier topology module, a driving circuit module, an auxiliary power supply module, a microcontroller module and a sampling circuit module;
the input end of the rectifier topology module is connected with an alternating current power grid, and the output end of the rectifier topology module is connected with a direct current side load;
the driving circuit module is connected with the rectifier topology module and is simultaneously connected with the microcontroller module;
the sampling circuit module comprises an alternating voltage sampling circuit, an alternating current sampling circuit and a direct voltage sampling circuit, and is used for intercepting signals from the output side of an alternating current power grid and the output side of the rectifier topology module respectively and simultaneously connecting the sampling circuit module with the microcontroller module to realize feedback;
and the auxiliary power supply module is respectively connected with the microcontroller, the driving circuit and the sampling circuit to provide voltages required by all parts.
Furthermore, the microcontroller module is externally connected with a keyboard, and simple man-machine communication is realized by inputting data or commands through the keyboard.
The auxiliary power supply module takes an optical coupler PS2801 and a controllable precise voltage-stabilizing source TL431 as feedback parts to stabilize output voltage.
The drive circuit module adopts an optical coupling isolation drive circuit, so that the DSP is not burnt, and the PWM signal can be amplified.
The direct-current voltage sampling circuit is used for measuring voltage values of two sides of a direct-current side capacitor C1 and a capacitor C2 in the rectifier topology module, feeding collected data back to the microcontroller module, judging the voltage values of the two capacitors by the microcontroller module, and controlling the voltage balance of two ends of the capacitor C1 and the capacitor C2 by adopting a capacitor midpoint balance control algorithm; the alternating current sampling circuit samples bridge arm current at the midpoint of the capacitor and determines the charge-discharge state of the capacitor.
The capacitance midpoint balance control algorithm is based on a space vector pulse width modulation algorithm SVPWM, a midpoint balance factor f is added to positive and negative small vector action time Tp and Tn of the space vector pulse width modulation algorithm SVPWM respectively, and a modulation function is redistributed by changing the positive and negative small vector action time so as to realize balanced voltage division of a direct-current side capacitor.
The process of adding the midpoint balance factor f to the positive and negative small vector action time Tp and Tn of the space vector pulse width modulation algorithm SVPWM is as follows:
wherein Tpn is Tp + Tn, and the value of f is between-1 and 1; if U isc1>Uc2When Tp is<The balance of the midpoint capacitance can be ensured only when Tn is used, and the value range (0,1) of f is obtained; if U isc1<Uc2When Tp is>The balance of the midpoint capacitance can be ensured only when Tn is used, and the value range of f is (-1,0) at the moment.
On the other hand, the invention also provides a method for rectifying by adopting the three-phase three-level high power factor rectifying device, which comprises the following steps:
step 1: the microcontroller module firstly configures a system clock, namely a processor running time reference, so that the overall energy consumption of a chip is reduced;
step 2: writing a program language into the chip, realizing the configuration of the functional unit, and initializing an input port and an output port;
and step 3: setting interrupt off, and entering interrupt after the interrupt condition is realized;
and 4, step 4: initializing a PIE interrupt vector table, an ePWM module and an ADC sampling module, ensuring that digital-to-analog conversion is carried out on the sampled digital quantity, converting voltage and current into analog quantity, and then carrying out subsequent calculation;
and 5: putting the sampled voltage and current and the capacitor midpoint balance control algorithm in the same modulation function, sampling a data signal in real time, and judging whether midpoint balance is realized or not by using the modulation function;
step 6: if the midpoint balance is realized, the interrupt condition is reached, and an interrupt subprogram is entered; if the midpoint balance is not realized, namely the interrupt condition is not reached, sampling is continued, and whether the next interrupt subroutine is started or not is judged according to the sampling analog quantity.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:
1. the device and the method provided by the invention fully utilize the advantages that the diode midpoint clamping type three-level rectifier has a relatively simple structure, the harmonic content of the network side current is lower than that of a two-level rectifier and the like from the aspects of safety and economy, the Vector is firstly decomposed into two positive and negative small vectors which are nearest to the diode midpoint clamping type three-level rectifier in a Space Vector Pulse Width Modulation (SVPWM) algorithm, the action sizes of the two positive and negative small vectors are expressed by the action time length, and the final voltage Vector is synthesized by voltage vectors with different time proportions, so that the generated voltage waveform is ensured to be approximate to a sine wave to the maximum extent.
2. The device provided by the invention applies a capacitance midpoint balance algorithm in the microcontroller module, embodies great superiority in inhibiting midpoint potential fluctuation, and ensures the safe operation of the rectifier to the greatest extent.
Drawings
Fig. 1 is a schematic structural diagram of a three-phase three-level high power factor rectifying device in an embodiment of the invention;
FIG. 2 is a single-phase bridge arm topology diagram of a diode clamp type rectifier according to the background art of the present invention;
FIG. 3 is a complete topology diagram of a diode-clamped rectifier according to the background art of the present invention;
FIG. 4 is a schematic diagram of a feedback control circuit for DC 12V voltage of the auxiliary power module according to an embodiment of the invention;
FIG. 5 is a schematic diagram of a driving circuit module according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a DC voltage sampling circuit in an embodiment of the present invention;
FIG. 7 is a schematic diagram of an AC voltage sampling circuit in an embodiment of the present invention;
FIG. 8 is a schematic diagram of an AC current sampling circuit in an embodiment of the present invention;
fig. 9 is a flowchart of a method for rectifying by using a three-phase three-level high power factor rectifying device according to an embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
As shown in fig. 1, the three-phase three-level high power factor rectifier device in this embodiment is as follows:
the device comprises a rectifier topology module, a driving circuit module, an auxiliary power supply module, a microcontroller module and a sampling circuit module;
in this embodiment, the rectifier topology module is shown in fig. 2 and fig. 3, and includes a three-phase power input end, an incoming line inductor and resistor, a rectifier circuit, and a dc side capacitor, which are connected in sequence; four full-control MOSFET switching tubes are connected in series and then connected with a clamping diode to form a bridge arm, the middle point of the diode is connected with the middle points of two identical capacitors on the direct current side, and the inductor on the direct current side is connected with two direct current capacitors C1 and C2 which are equal in size in parallel. The microcontroller module controls the driving circuit module in real time so as to realize the on-off of the switching tube; the driving circuit module amplifies signals of the main control I/O port, is simultaneously connected with the rectifying circuit and the single chip microcomputer, and is matched with the microcontroller module to play a role;
in this embodiment, the microcontroller module is a DSP chip tms320f28035 from C2000TM series manufactured by texas instruments. The chip is provided with a high-efficiency 32-bit CPU, adopts a Harvard bus architecture, and is internally provided with a 128K flash memory. The working voltage of the chip is 3.3V when the chip works normally. The mainly used is equipped with ePWM module and ADC module outward, and ePWM is used for exporting the PWM signal, and the ADC is used for sampling current-voltage and the value of the analog quantity of sampling guarantees between 0 to 3.3V, if exceed 3.3V probably burn out the DSP chip. The system uses a 10MHz crystal oscillator, obtains 60MHz main frequency after frequency multiplication through a DSP, and generates a PWM signal with the switching frequency of 20 KHz. And an ULN2003 NOT gate array is added after the PWM signal is output, so that the driving capability of the PWM is improved and reversed. LM1117-3.3 is a voltage stabilizing chip, which supplies power to the DSP after the voltage of 5V is reduced to 3.3V.
The input end of the rectifier topology module is connected with an alternating current power grid, and the output end of the rectifier topology module is connected with a direct current side load;
the driving circuit module is connected with the rectifier topology module and is simultaneously connected with the microcontroller module;
the sampling circuit module comprises an alternating voltage sampling circuit, an alternating current sampling circuit and a direct voltage sampling circuit, and is used for intercepting signals from the output side of an alternating current power grid and the output side of the rectifier topology module respectively and simultaneously connecting the sampling circuit module with the microcontroller module to realize feedback;
and the auxiliary power supply module is respectively connected with the microcontroller, the driving circuit and the sampling circuit to provide voltages required by all parts.
Furthermore, the microcontroller module is externally connected with a keyboard, and simple man-machine communication is realized by inputting data or commands through the keyboard.
The auxiliary power supply module takes an optical coupler PS2801 and a controllable precise voltage-stabilizing source TL431 as feedback parts to stabilize output voltage.
In this embodiment, a feedback control circuit of the auxiliary power module dc 12V voltage is shown in fig. 4. DSP, analog circuit sampling module, drive circuit etc. all need the power supply, and operating voltage diverse, and it is unrealistic that all adopt outside direct current power supply, so auxiliary power source in the hardware design is an extremely important ring, has had auxiliary power source, only need externally provide a power and supply power for auxiliary power source, just can guarantee that the power supply of each module is normal.
The basic topology of the auxiliary power supply is a flyback circuit. An optical coupler PS2801 and a controllable precision voltage stabilizing source TL431 serve as a feedback part. The auxiliary power supply works under the voltage of +24V to +48V, and after the circuit is triggered to work normally, the circuit can output direct current voltages of +5V, +12V and-12V and a high-frequency signal. The transformers respectively generate three paths of output voltages, wherein the two paths of output voltages are used for outputting symmetrical positive and negative 12V voltages. In order to ensure that the output voltage can be stabilized at 12V, feedback control is needed, specifically, after the 12V dc voltage is divided by using a resistor, the divided voltage is compared with a reference value of 2.5V of a TL431 chip, so that the current flowing through the TL431 changes to control the current of the secondary side of the optocoupler PS2801, the PS2801 is connected with a COMP pin of a control chip TL2845, and the change of the current causes the change of a PWM duty ratio to further control the output voltage of the secondary side. When output voltage is greater than 12V, the secondary side current of opto-coupler grow, and PWM signal duty cycle can diminish, and secondary side output voltage diminishes, and when output voltage was less than 12V, the PWM duty cycle can grow, and output voltage also grows to this stable output voltage. The output reference zero point is the transformer midpoint.
The drive circuit module adopts an optical coupling isolation drive circuit, so that the DSP is not burnt, and the PWM signal can be amplified.
In this embodiment, the driving circuit module is as shown in fig. 5. The micro control unit outputs more 3.3V or 5V voltage, and cannot drive the switching tube to be switched on or switched off, so that the switching tube can be controlled only by amplifying the voltage by using a driving circuit. The design uses a drive circuit isolated by using the optical coupler, thereby not only ensuring that the DSP cannot be burnt, but also amplifying the PWM signal to control the switch tube.
In the driving circuit module of the rectifying device of the embodiment, firstly, the high-frequency signal generated by the auxiliary power supply passes through the high-frequency transformer, and then is rectified and filtered to obtain +15V, -8V and reference zero potential. And connecting +15V and-8V with an 8 pin Vcc + and a 5 pin Vcc-of the optocoupler chip TLP350, connecting PWM with a 3 pin (cathode), and connecting +5V of the auxiliary power supply with a 2 pin (anode). When the PWM is in a high level, the output of the drive circuit is in a negative 8V state, and when the PWM is in a low level, the output of the drive circuit is in a reverse direction with the original logic, but in the design of the main control board, the PWM output is in a reverse direction through ULN2003, and finally the output logic of the drive circuit is ensured to be consistent with the logic output by the DSP.
The direct-current voltage sampling circuit is used for measuring voltage values of two sides of a direct-current side capacitor C1 and a capacitor C2 in the rectifier topology module, feeding collected data back to the microcontroller module, judging the voltage values of the two capacitors by the microcontroller module, and controlling the voltage balance of two ends of the capacitor C1 and the capacitor C2 by adopting a capacitor midpoint balance control algorithm; the alternating current sampling circuit samples bridge arm current at the midpoint of the capacitor and determines the charge-discharge state of the capacitor.
In this embodiment, the sampling circuit is used to collect feedback quantity of the system. Because the voltage value in the actual topology is much larger than 3.3V and cannot be sampled by the DSP, the sampled electrical quantity needs to be scaled in the sampling circuit to be kept between 0 and 3.3V, and the sampled electrical quantity is also protected by the DSP. The design of the rectifier takes an analog circuit as a sampling circuit. TL074 is a commonly used operational amplifier chip, and the supply voltage is supplied by the plus and minus 12V of the auxiliary power supply.
The dc voltage sampling circuit is shown in fig. 6. The operational amplifier has the characteristic of virtual short and virtual break, and different resistance values are allocated to the resistor R, so that the operational amplifier can obtain different scaling multiples.
The ac voltage sampling circuit is shown in fig. 7. Because the DSP cannot sample the negative voltage, a dc bias needs to be added to the ac sampling circuit to change the ac voltage to a dc voltage between 0 and 3.3V for sampling.
An ac current sampling circuit is shown in fig. 8. The ACS712-20 Hall current sensor is selected to sample the inductive current as the input of the sampling circuit, and the DSP cannot directly sample the current signal, so the current signal needs to be converted into voltage for sampling. The DC 5V voltage is selected to provide a voltage for the ACS712 Hall current sensor, which outputs a 2.5V reference voltage without current flowing through the sensor. The principle of the current sampling circuit is similar to that of a voltage follower, i.e. the input voltage is equal to the output voltage.
The capacitance midpoint balance control algorithm is based on a space vector pulse width modulation algorithm SVPWM, a midpoint balance factor f is added to positive and negative small vector action time Tp and Tn of the space vector pulse width modulation algorithm SVPWM respectively, and a modulation function is redistributed by changing the positive and negative small vector action time so as to realize balanced voltage division of a direct-current side capacitor.
The process of adding the midpoint balance factor f to the positive and negative small vector action time Tp and Tn of the space vector pulse width modulation algorithm SVPWM is as follows:
wherein Tpn is Tp + Tn, and the value of f is between-1 and 1; if U isc1>Uc2When Tp is<The balance of the midpoint capacitance can be ensured only when Tn is used, and the value range (0,1) of f is obtained; if U isc1<Uc2When Tp is>The balance of the midpoint capacitance can be ensured only when Tn is used, and the value range of f is (-1,0) at the moment.
In addition, the present embodiment further provides a method for performing rectification by using the three-phase three-level high power factor rectification device, where a flow of the method is shown in fig. 9, and the method includes the following steps:
step 1: the microcontroller module firstly configures a system clock, namely a processor running time reference, so that the overall energy consumption of a chip is reduced;
step 2: writing a program language into the chip, realizing the configuration of the functional unit, and initializing an input port and an output port;
and step 3: setting interrupt off, and entering interrupt after the interrupt condition is realized;
and 4, step 4: initializing a PIE interrupt vector table, an ePWM module and an ADC sampling module, ensuring that digital-to-analog conversion is carried out on the sampled digital quantity, converting voltage and current into analog quantity, and then carrying out subsequent calculation;
and 5: putting the sampled voltage and current and the capacitor midpoint balance control algorithm in the same modulation function, sampling a data signal in real time, and judging whether midpoint balance is realized or not by using the modulation function;
step 6: if the midpoint balance is realized, the interrupt condition is reached, and an interrupt subprogram is entered; if the midpoint balance is not realized, namely the interrupt condition is not reached, sampling is continued, and whether the next interrupt subroutine is started or not is judged according to the sampling analog quantity.
In this embodiment, the program of the DSP is programmed based on the syntax of the C language. After the device is powered on and started, the DSP needs to be initialized, including initializing a system clock, interrupting initialization, initializing I/O port configuration, configuring registers of ePWM and ADC, and the like. The ePWM initialization is to configure registers related to PWM cycle, count mode, operation mode, dead zone, and the like. ADC initialization is the configuration of the sampling period and associated registers for the conversion mode. The I/O port configuration is mainly to configure relevant registers of functions such as I/O modes, selection of multiplexing functions and the like.
Claims (8)
1. The utility model provides a three-phase three-level high power factor rectifier device, includes rectifier topology module, drive circuit module, auxiliary power module which characterized in that: the system also comprises a microcontroller module and a sampling circuit module;
the input end of the rectifier topology module is connected with an alternating current power grid, and the output end of the rectifier topology module is connected with a direct current side load;
the driving circuit module is connected with the rectifier topology module and is simultaneously connected with the microcontroller module;
the sampling circuit module comprises an alternating voltage sampling circuit, an alternating current sampling circuit and a direct voltage sampling circuit, and is used for intercepting signals from the output side of an alternating current power grid and the output side of the rectifier topology module respectively and simultaneously connecting the sampling circuit module with the microcontroller module to realize feedback;
and the auxiliary power supply module is respectively connected with the microcontroller, the driving circuit and the sampling circuit to provide voltages required by all parts.
2. The three-phase three-level high power factor rectifier device of claim 1, wherein: the microcontroller module is externally connected with a keyboard, and simple man-machine communication is realized by inputting data or commands through the keyboard.
3. The three-phase three-level high power factor rectifier device of claim 1, wherein: the auxiliary power supply module takes an optical coupler PS2801 and a controllable precise voltage-stabilizing source TL431 as feedback parts to stabilize output voltage.
4. The three-phase three-level high power factor rectifier device of claim 1, wherein: the drive circuit module adopts an optical coupling isolation drive circuit, so that the DSP is not burnt, and the PWM signal can be amplified.
5. The three-phase three-level high power factor rectifier device of claim 1, wherein: the direct-current voltage sampling circuit is used for measuring voltage values of two sides of a direct-current side capacitor C1 and a capacitor C2 in the rectifier topology module, feeding collected data back to the microcontroller module, judging the voltage values of the two capacitors by the microcontroller module, and controlling the voltage balance of two ends of the capacitor C1 and the capacitor C2 by adopting a capacitor midpoint balance control algorithm; the alternating current sampling circuit samples bridge arm current at the midpoint of the capacitor and determines the charge-discharge state of the capacitor.
6. The three-phase three-level high power factor rectifier device of claim 5, wherein: the capacitance midpoint balance control algorithm is based on a space vector pulse width modulation algorithm SVPWM, a midpoint balance factor f is added to positive and negative small vector action time Tp and Tn of the space vector pulse width modulation algorithm SVPWM respectively, and a modulation function is redistributed by changing the positive and negative small vector action time so as to realize balanced voltage division of a direct-current side capacitor.
7. The three-phase three-level high power factor rectifier device of claim 6, wherein: the process of adding the midpoint balance factor f to the positive and negative small vector action time Tp and Tn of the space vector pulse width modulation algorithm SVPWM is as follows:
wherein Tpn is Tp + Tn, and the value of f is between-1 and 1; if U isc1>Uc2When Tp is<The midpoint can be guaranteed only when the line is TnThe capacitance is balanced, and the value range of f is (0, 1); if U isc1<Uc2When Tp is>The balance of the midpoint capacitance can be ensured only when Tn is used, and the value range of f is (-1,0) at the moment.
8. A method of rectifying with a three-phase three-level high power factor rectifier device according to any of claims 1 to 7, characterized in that it comprises the following steps:
step 1: the microcontroller module firstly configures a system clock, namely a processor running time reference, so that the overall energy consumption of a chip is reduced;
step 2: writing a program language into the chip, realizing the configuration of the functional unit, and initializing an input port and an output port;
and step 3: setting interrupt off, and entering interrupt after the interrupt condition is realized;
and 4, step 4: initializing a PIE interrupt vector table, an ePWM module and an ADC sampling module, ensuring that digital-to-analog conversion is carried out on the sampled digital quantity, converting voltage and current into analog quantity, and then carrying out subsequent calculation;
and 5: putting the sampled voltage and current and the capacitor midpoint balance control algorithm in the same modulation function, sampling a data signal in real time, and judging whether midpoint balance is realized or not by using the modulation function;
step 6: if the midpoint balance is realized, the interrupt condition is reached, and an interrupt subprogram is entered; if the midpoint balance is not realized, namely the interrupt condition is not reached, sampling is continued, and whether the next interrupt subroutine is started or not is judged according to the sampling analog quantity.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113839578A (en) * | 2021-10-15 | 2021-12-24 | 上海交通大学 | Multi-level converter midpoint voltage balancing system and method based on reinforcement learning |
| CN114244141A (en) * | 2022-02-24 | 2022-03-25 | 合肥博雷电气有限公司 | Three-level half-bridge digital circuit and voltage double closed-loop adjusting method thereof |
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2021
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113839578A (en) * | 2021-10-15 | 2021-12-24 | 上海交通大学 | Multi-level converter midpoint voltage balancing system and method based on reinforcement learning |
| CN113839578B (en) * | 2021-10-15 | 2024-03-01 | 上海交通大学 | Multi-level converter neutral point voltage balance system and method based on reinforcement learning |
| CN114244141A (en) * | 2022-02-24 | 2022-03-25 | 合肥博雷电气有限公司 | Three-level half-bridge digital circuit and voltage double closed-loop adjusting method thereof |
| CN114244141B (en) * | 2022-02-24 | 2022-06-03 | 合肥博雷电气有限公司 | Three-level half-bridge digital circuit and voltage double closed-loop adjusting method thereof |
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