CN105634255A - 18-pulse-based SVPWM three-phase electronic voltage regulator - Google Patents
18-pulse-based SVPWM three-phase electronic voltage regulator Download PDFInfo
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- CN105634255A CN105634255A CN201610064445.5A CN201610064445A CN105634255A CN 105634255 A CN105634255 A CN 105634255A CN 201610064445 A CN201610064445 A CN 201610064445A CN 105634255 A CN105634255 A CN 105634255A
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
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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
- H02M1/12—Arrangements for reducing harmonics from ac input or output
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/12—Regulating voltage or current wherein the variable actually regulated by the final control device is ac
- G05F1/40—Regulating voltage or current wherein the variable actually regulated by the final control device is ac using discharge tubes or semiconductor devices as final control devices
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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
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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Abstract
The invention discloses an 18-pulse-based SVPWM three-phase electronic voltage regulator. The voltage regulator comprises a main circuit, a central control circuit, an output voltage detection circuit, an overcurrent detection circuit, a pulse isolation amplifying circuit, a keyboard and display circuit, a first control power supply and a second control power supply, wherein the main circuit comprises a three-phase uncontrollable rectifier, a direct current filter and a three-phase IGBT inverter; and the central control circuit comprises a microprocessor and a pulse separation output circuit. The output alternating current voltage of the voltage regulator provided by the invention is subjected to an 18-pulse space voltage vector pulse width modulation technology and voltage closed loop control, so that the voltage regulator is high in power factor, low in harmonic and high in voltage stability; the shortcomings of low power factor, high harmonic and low voltage stability of thyristor phase-shifting control are overcome; an iron core and a winding of the conventional electromagnetic inductance type voltage regulator are not required, so that the voltage regulator is light in weight, small in volume and convenient to carry; and in addition, the voltage regulator is simple in circuit structure and reliable, and can be widely applied to any occasions requiring variable power supply voltages.
Description
Technical field
The present invention relates to power electronics, transformation of electrical energy technology, particularly relate to a kind of three-phase high power factor, the electronic pressure controller of low harmony wave.
Background technology
Presently used pressure regulator mostly adopts induction pressure regulator, or the electronic pressure controller of IGCT phase shifting control, the former, since it is desired that unshakable in one's determination and winding, unshakable in one's determination being used for constitutes magnetic circuit, winding is used for producing induced voltage, its Heavy Weight, non-ferrous metal consumption is big, can produce copper loss and iron loss during voltage regulator operation, loss is big, causes it inefficient; And the latter, owing to adopting phase shift to control output voltage, when output voltage is relatively low, phase shifting angle is relatively big, causes power factor to reduce, produces excessive reactive power and harmonic wave simultaneously.
Summary of the invention
Present invention aims to the deficiencies in the prior art, a kind of SVPWM Three-phase electronic pressure regulator based on 18 pulses is provided, the present invention adopts IGBT inverter control output voltage, do not need unshakable in one's determination and winding, output voltage need not be controlled by phase shift, overcome induction voltage regulator and IGCT phase-shift voltage regulating device is had the disadvantage that.
It is an object of the invention to be achieved through the following technical solutions: a kind of SVPWM Three-phase electronic pressure regulator based on 18 pulses, including main circuit, central control circuit, output voltage detecting circuit, over-current detection circuit, impulsive quarantine amplifying circuit, Key and display circuit, first control power supply and second and control power supply. described main circuit includes the uncontrollable commutator of three-phase, DC filter and the three-phase IGBT inverter that are sequentially connected, described central control circuit includes microprocessor and pulse separation output circuit, described impulsive quarantine amplifying circuit includes photoelectric coupling isolation circuit and pulse amplifying circuit, described first control power supply is that central control circuit, output voltage detecting circuit, over-current detection circuit and Key and display circuit are powered, described second control power supply is that impulsive quarantine amplifying circuit is powered, the alternating current power supply of the three-phase constant frequency and constant voltage of electrical network is input to main circuit, is transformed to the alternating current of constant frequency transformation through main circuit, and three-phase alternating current load is arrived in output, Key and display circuit inputs intended output voltage values to central control circuit by man-machine interface, output voltage detecting circuit detects the output voltage of main circuit three-phase IGBT inverter and feeds back to microprocessor, overcurrent sensing circuit detects the output electric current of main circuit three-phase IGBT inverter and feeds back to microprocessor, the pulse calculated according to 18 pulse SVPWM principles is input to pulse separation output circuit by being separated by microprocessor, then impulsive quarantine amplifying circuit is delivered in the pulse after separation and be amplified isolation, it is then sent through main circuit, control the three-phase IGBT inverter of main circuit, the three-phase alternating current of output constant frequency transformation.
Further, described output voltage detecting circuit includes diode rectification module U1, electric capacity C1-C4, resistance R1, R2, potentiometer RP1 and analog voltage isolated amplifier U2; The three-phase output voltage of main circuit three-phase IGBT inverter receives the AC of diode rectification module U1, diode rectification module U1 DC side output DC voltage, filter through electric capacity C1 and C2, bleeder circuit dividing potential drop through resistance R1, potentiometer RP1 and resistance R2 composition, output voltage is obtained from potentiometer two ends, giving analog voltage isolated amplifier U2 then through electric capacity C3 filtering, the output voltage of analog voltage isolated amplifier U2 is followed by the input end of analog signal mouth of microprocessor through electric capacity C4 filtering.
Further, described overcurrent sensing circuit is formed in parallel by A phase, B phase, C phase three-phase window comparator, and every phase structure is identical, for A phase, A phase window comparator is by resistance RA1-RA4, potentiometer RPA, operational amplifier U6A, diode DA1-DA3 form; The negative pole of diode DA1 be connected with the positive pole of diode DA2 after as the input of window comparator, one end of the positive pole connecting resistance RA1 of diode DA1, the other end of resistance RA1 is connected with the adjustable end of potentiometer RPA and is followed by the negative input end of operational amplifier U6A, one termination+12V the power supply of potentiometer RPA, other end ground connection; One end of the negative pole connecting resistance RA2 of diode DA2, the other end of resistance RA2 is connected with one end of resistance RA3 and is followed by the positive input terminal of operational amplifier U6A, the other end ground connection of resistance RA3; The positive pole of resistance RA4 and diode DA3 is connected and is followed by the outfan of operational amplifier U6A, positive supply termination+12V the power supply of operational amplifier U6A, negative supply termination-12V power supply, another termination+12V power supply of resistance RA4, the negative pole of diode DA3 is as the outfan of window comparator. The output A phase current of main circuit three-phase IGBT inverter receives the input of window comparator through the current signal IA1 that current transformer exports. Determined the positive threshold of window comparator by resistance RA2, RA3, determined the negative threshold of window comparator by RPA; When input current signal IA1 true amplitude exceedes positive threshold voltage or negative amplitude exceedes negative threshold voltage, window comparator output signal VA0 exports high level; When input current signal IA1 is not above threshold voltage, window comparator output signal VA0 output low level. In like manner; input current signal respectively IB1 and the IC1 that B phase, C are corresponding, corresponding output signal respectively VB0 and VC0, if VA0, VB0 and VC0 three-phase has arbitrary phase generation overcurrent, export high level; now send interruption application to microprocessor, protect.
Further, described pulse separation output circuit is made up of A phase, B phase, home pulse separation output circuit, and for A phase, A phase pulse separation output circuit is by NAND gate U4A-U4C, resistance R6, R7, electric capacity C6, C7, and diode D6, D7 form. two inputs of NAND gate U4A be connected with an input of NAND gate U4B after as the input of A phase pulse separation output circuit, an input of the output termination NAND gate U4C of NAND gate U4A, one end of resistance R6, one end of electric capacity C6 are connected with the positive pole of diode D6 and are followed by another input of NAND gate U4B, another termination+5V power supply of resistance R6, one end of resistance R7, one end of electric capacity C7 are connected with the positive pole of diode D7 and are followed by another input of NAND gate U4C, another termination+5V power supply of resistance R7, the other end of electric capacity C6 be connected with the other end of electric capacity C7 after ground connection, the negative pole of diode D6 be connected with the outfan of NAND gate U4C after as the input of the lower brachium pontis of A phase of impulsive quarantine amplifying circuit, the negative pole of diode D7 be connected with the outfan of NAND gate U4B after as the input of brachium pontis in the A phase of impulsive quarantine amplifying circuit, B phase is identical with A phase with the pulse separation output circuit of C phase. the A phase PWMA signal of microprocessor output receives A phase pulse-separating circuit input, anti-phase through NAND gate U4A, become B signal, PWMA signal and B signal are coupled with an input of NAND gate U4B and U4C, another input D of another input C and NAND gate U4C of NAND gate U4B respectively with resistance R6, electric capacity C6, resistance R7, the delay circuit that electric capacity C7 is constituted connects, and outfan PWMAB and the PWMAT of U4C and U4B it is cross connected to through diode D6 and D7, when PWMAT is uprised level by low level, D end just can become high level after the delay circuit delays a period of time being made up of resistance R7 and electric capacity C7, so that the outfan PWMAB of U4C to postpone a period of time step-down level, the ON time making the IGBT switching tube of brachium pontis under A phase extends time T than the turn-off time of upper brachium pontisd; When PWMAB is uprised level by low level, C end just can become high level after the delay circuit delays a period of time being made up of resistance R6 and electric capacity C6, so that the outfan PWMAT of U4B to postpone a period of time step-down level so that in A phase, the ON time of the IGBT switching tube of brachium pontis extends time T than the turn-off time of lower brachium pontisd��
Further, described impulsive quarantine amplifying circuit has six tunnels, six IGBT switching tubes of corresponding main circuit three-phase IGBT inverter, brachium pontis in A phase respectively, in A phase, brachium pontis impulsive quarantine amplifying circuit is by Quick photoelectric bonder U3, resistance R11-R14, electric capacity C11, C12, diode D11, stabilivolt DW1, DW2, PNP triode Q11, NPN audion Q12 forms. Positive input termination+5V the power supply of Quick photoelectric bonder U3, the upper brachium pontis signal of negative input termination A phase pulse separation output circuit; The power end of Quick photoelectric bonder U3 and one end of resistance R11, one end of resistance R12, one end of electric capacity C11, PNP triode Q11 emitter stage be connected the positive pole VA+ of the road 24V power supply being followed by the second control power supply output; The collector output of Quick photoelectric bonder U3, one end of resistance R13 are connected with the negative pole of diode D11, the positive pole of diode D11, the negative pole of stabilivolt DW2 are connected with the other end of resistance R12, and the other end of resistance R11, the other end of electric capacity C11, the negative pole of stabilivolt DW1 are connected in main circuit A phase after being connected the emitter stage of brachium pontis IGBT switching tube with the emitter stage outfan of Quick photoelectric bonder U3; The other end of R13 is connected with the base stage of PNP triode Q11; The positive pole of stabilivolt DW2 connects the base stage of NPN audion Q12, the negative pole VA-of the positive pole of stabilivolt DW1 and the emitter stage Jun Jiegai road 24V power supply of NPN audion Q12; After electric capacity C12 and resistor coupled in parallel one termination PNP triode Q11 colelctor electrode, the other end be connected with the colelctor electrode of NPN audion Q12 after as the gate pole of brachium pontis IGBT switching tube in A phase. 24V power supply is divided into+15V and-9V by resistance R11, electric capacity C11 and stabilivolt DW1; Quick photoelectric bonder U3 receives the pulse signal PWMAT of A phase pulse separation output circuit output, it it is useful signal when PWMAT is low level, the now output triode conducting of Quick photoelectric bonder U3, through resistance R13, PNP triode Q11 is turned on, and NPN audion Q12 turns off, export driving pulse VG1 through resistance R14 and electric capacity C12 to brachium pontis IGBT switching tube in major loop A phase so that IGBT switching tube turns on; When pulse signal PWMAT is high level, the output triode of photoelectrical coupler U3 turns off, and PNP triode Q11 turns off, and NPN audion Q12 base stage obtains through resistance R12 and stabilivolt DW2 and drives current lead-through, VG1 is moved to-9V, so that IGBT switching tube turns off.
Further, the handling process of described microprocessor is as follows:
(1) Key and display circuit provides output voltage desired value, calculates intended index of modulation M*; By output voltage detecting circuit sampling and outputting voltage actual value, compare with desired value, try to achieve voltage deviation �� U, then pass through scale operation and try to achieve the offset �� M of the index of modulation, �� M=Kp �� �� U, Kp is proportionality coefficient, final index of modulation M=M*+ �� M, M value is delivered in SVPWM module.
(2) pulse width T 1 of 18 pulses, T2 and Tb are calculated by SVPWM module, particularly as follows:
A, B, C three-phase phase voltage exported by main circuit constitutes space vector of voltage, corresponding 6 the effective basic vectors of space vector of voltage and two zero vectors, 6 effective basic vectors divide the plane into six sectors, each sector is further added by two resultant vectors, constitutes 18 voltage vectors in a cycle, and each voltage vector working time is TP=T/18, T is the cycle of output voltage, when output voltage frequency is fixed as 50Hz, T=20ms, TP=1.111ms.
The synthetic method of each sector space vector of voltage is identical, for the first sector, specific as follows:
The first resultant vector V11=VR �� 20 �� for the first sector, by two adjacent basic effectively vector V1 and V2 and zero vector V0 synthesis, V1 and V2 is T1 and T2, V0 action time action time respectively is T0, VR is the length of space voltage vector, i.e. voltage desired value. Can obtain according to impulse equivalency principle: T1=M �� TP �� 0.7422; Wherein M=VR/V1, is called the index of modulation, and M can determine according to the amplitude of expection output voltage. In like manner can obtain: T2=M �� TP �� 0.395; Zero voltage vector working time T0=TP-T1-T2;
For the second resultant vector V12 of the first sector, also according to impulse equivalency principle, it is thus achieved that T1=M �� TP �� 0.395, T2=M �� TP �� 0.7422.
For basic vector V1, only V1 work, V2 does not work, so T2=0. Can be obtained by impulse equivalency principle: Tb=M �� TP; Tb is basic vector V1 time when working independently.
Resultant vector V11, V12 adopt 5 sections of symmetrical pulse t1-t5Realize. Basic vector V1 adopts 3 sections of symmetrical pulse t1-t3Realize.
(3) two intervalometers are set: intervalometer 1 and timer 2; Intervalometer 1 completes the time timing of TP. In the interrupt routine of intervalometer 1, completing the renewal of 18 voltage vectors, at the initial period of each voltage vector, output voltage vector V0, start timer 2 simultaneously, the timing of timer 2 is set to t1=T0/2; Timer 2 completes each voltage vector 4 time period t of residue2��t5Change time timed task, the time period of sector residing for voltage vector and correspondence thereof determines to need the vector of output, each sector to realize principle identical. For the first sector, work vector is V1, V2, at t2=T1/2 the time period, output vector is V1. At t3=T2 the time period, output vector is V2, at t4=T1/2 the time period, output vector is V1, at t5=T0/2 the time period, output vector is V0, t5Being timed to, this resultant vector terminates, and waiting timer 1 starts the beginning of next resultant vector, and so circulation constitutes 18 pulse SVPWM control processes.
(4) being realized the adjustment of main circuit output voltage by 18 pulse SVPWM modules: when increasing output voltage amplitude, then make the active voltage vector working time increase, the Zero voltage vector working time shortens; When reducing output voltage amplitude, then making the active voltage vector working time shorten, the Zero voltage vector working time increases.
The invention has the beneficial effects as follows:
(1) Using dSPACE of SVPWM technology (SVPWM) is adopted to control output voltage, 18 pulses are had in each cycle, the width of each pulse calculates through SVPWM algorithm, thus producing the polygon on 18 limits, approach a circular space voltage vector track, output voltage is close to sinusoidal wave, harmonic wave is little, power factor is high, output voltage range width, 0V��380V (rated voltage) can be reached, overcome the deficiency that IGCT phase shifting control pressure regulator power factor is low, output voltage distortion is big, harmonic wave is big, scope is limited.
(2) compared with the induction pressure regulator of tradition, a kind of SVPWM Three-phase electronic pressure regulator based on 18 pulses provided by the invention, eliminate iron core and the winding of traditional induction pressure regulator, lightweight, volume is little, and efficiency is high.
(3) SVPWM technology and the closed loop control of output voltage feedback are adopted, it is achieved that output voltage stability is good, the advantage that control accuracy is high. Overcome the deficiency that output voltage fluctuates, output voltage stability is poor of conventional open-loop electronic pressure controller with input voltage fluctuation and load current size.
(4) general purpose microprocessor is adopted to constitute central control circuit, software approach is adopted to realize SVPWM technology, input and the display of expection output voltage is realized by numeric keypad and LED charactron, relatively conventional simulation pressure regulator, hardware circuit is simple, reliability height, digital input and display, control accuracy is high.
(5) in the microprocessor SVPWM module of central control circuit, six switching tubes need six roads to drive the output function of signal only to need three holding wires to be achieved that, and six roads drive signal to realize by devising a kind of hardware pulse split circuit. This circuit can export pulse separation a phase and become the two-way of upper and lower brachium pontis switching tube to drive signal, and there is dead band interlock function, so the benefit of design is the dangerous effect both having achieved and having prevented the mutually upper and lower bridge arm direct pass of main circuit one, and time when saving again software design opens and disappears.
(6) in overcurrent sensing circuit, a kind of window comparator circuit is adopted. The output low level when main circuit output current signal (obtaining through transformer detection) is in the positive negative threshold of window comparator circuit, is expressed as normal current; When output current signal is beyond positive negative threshold, exports high level, be expressed as abnormal current. Just interrupt carrying out error protection to microprocessor application when the arbitrary phase current of three-phase occurs abnormal. This is a kind of transient current protection, has protection relative to traditional average current protection fast, the feature that reliability is high.
Accompanying drawing explanation
Fig. 1 is based on the Three-phase electronic pressure regulator system block diagram of SVPWM;
Fig. 2 is the main circuit diagram of the present invention;
Fig. 3 is the output voltage detecting circuit figure of the present invention;
Fig. 4 (a) is the overcurrent sensing circuit figure of the present invention, and (b) is overcurrent sensing circuit input/output performance plot;
Fig. 5 is the pulse separation output circuit figure of the present invention;
Fig. 6 is the pulse separation output waveform figure of the present invention;
Fig. 7 is the impulsive quarantine amplification circuit diagram of the present invention;
Fig. 8 is the space vector of voltage figure in the cycle;
Fig. 9 is the first sector space vector of voltage figure;
Figure 10 is first sector resultant vector V11, V12 timing chart;
Figure 11 is the first sector basic vector V1 timing chart;
Figure 12 is the time circle diagram in complete cycle;
Figure 13 is output voltage closed loop control block diagram;
Figure 14 is microprocessor main program flow chart;
Figure 15 is timing microprocessor device 1 interrupt service subroutine flow chart;
Figure 16 is timing microprocessor device 2 interrupt service subroutine flow chart;
Figure 17 is microprocessor malfunctions interrupt service subroutine flow chart.
Detailed description of the invention
As it is shown in figure 1, a kind of SVPWM Three-phase electronic pressure regulator based on 18 pulses of the present invention is described in further detail below in conjunction with the drawings and specific embodiments.
One, hardware principle
As shown in Figure 1, a kind of SVPWM Three-phase electronic pressure regulator based on 18 pulses provided by the invention, controls power supply including main circuit, central control circuit, output voltage detecting circuit, over-current detection circuit, impulsive quarantine amplifying circuit, Key and display circuit, the first control power supply and second. described main circuit includes the uncontrollable commutator of three-phase, DC filter and the three-phase IGBT inverter that are sequentially connected, described central control circuit includes microprocessor and pulse separation output circuit, described impulsive quarantine amplifying circuit includes photoelectric coupling isolation circuit and pulse amplifying circuit, described first control power supply is that central control circuit, output voltage detecting circuit, over-current detection circuit and Key and display circuit are powered, described second control power supply is that impulsive quarantine amplifying circuit is powered, and described first control power supply and second controls power supply and all adopts the Switching Power Supply of special chip, the alternating current power supply of the three-phase constant frequency and constant voltage of electrical network is input to main circuit, is transformed to the alternating current of constant frequency transformation through main circuit, and output is to three-phase alternating current load, it is achieved thereby that voltage regulation function, Key and display circuit inputs intended output voltage values to central control circuit by man-machine interface, output voltage detecting circuit detects the output voltage of main circuit three-phase IGBT inverter and feeds back to microprocessor, overcurrent sensing circuit detects the output electric current of main circuit three-phase IGBT inverter and feeds back to microprocessor, the pulse calculated according to 18 pulse SVPWM principles is input to pulse separation output circuit by being separated by microprocessor, then impulsive quarantine amplifying circuit is delivered in the pulse after separation and be amplified isolation, it is then sent through main circuit, control the three-phase IGBT inverter of main circuit, the three-phase alternating current of output constant frequency transformation.
As in figure 2 it is shown, the uncontrollable commutator of Part I three-phase of described main circuit diagram is made up of six diode D1��D6; Part II DC filter is made up of electrochemical capacitor C0; Part III three-phase IGBT inverter is made up of six Insulated Gate Bipolar transistor (IGBT) T1��T6. The alternating current power supply of electrical network three-phase constant frequency and constant voltage receives the input of commutator, through rectifier rectification, output becomes unidirectional current, receives the input side of three-phase IGBT inverter then through filter filtering, and the outlet side output three-phase frequency of three-phase IGBT inverter is fixed, the alternating current of voltage variable.
As it is shown on figure 3, described output voltage detecting circuit includes diode rectification module U1, electric capacity C1-C4, resistance R1, R2, potentiometer RP1 and analog voltage isolated amplifier U2; Described analog voltage isolated amplifier U2 can adopt HCPL-7520 type product. The three-phase output voltage of main circuit three-phase IGBT inverter receives the AC of diode rectification module U1, diode rectification module U1 DC side output DC voltage, filter through electric capacity C1 and C2, bleeder circuit dividing potential drop through resistance R1, potentiometer RP1 and resistance R2 composition, output voltage is obtained from potentiometer two ends, giving analog voltage isolated amplifier U2 then through electric capacity C3 filtering, the output voltage of analog voltage isolated amplifier U2 is followed by the input end of analog signal mouth of microprocessor through electric capacity C4 filtering.
As shown in Fig. 4 (a), described overcurrent sensing circuit is formed in parallel by A phase, B phase, C phase three-phase window comparator, and every phase structure is identical, for A phase, A phase window comparator is by resistance RA1-RA4, potentiometer RPA, operational amplifier U6A, diode DA1-DA3 form; The negative pole of diode DA1 be connected with the positive pole of diode DA2 after as the input of window comparator, one end of the positive pole connecting resistance RA1 of diode DA1, the other end of resistance RA1 is connected with the adjustable end of potentiometer RPA and is followed by the negative input end of operational amplifier U6A, one termination+12V the power supply of potentiometer RPA, other end ground connection; One end of the negative pole connecting resistance RA2 of diode DA2, the other end of resistance RA2 is connected with one end of resistance RA3 and is followed by the positive input terminal of operational amplifier U6A, the other end ground connection of resistance RA3; The positive pole of resistance RA4 and diode DA3 is connected and is followed by the outfan of operational amplifier U6A, positive supply termination+12V the power supply of operational amplifier U6A, negative supply termination-12V power supply, another termination+12V power supply of resistance RA4, the negative pole of diode DA3 is as the outfan of window comparator. The output A phase current of main circuit three-phase IGBT inverter receives the input of window comparator through the current signal IA1 that current transformer exports. Determined the positive threshold of window comparator by resistance RA2, RA3, determined the negative threshold of window comparator by RPA; As shown in Fig. 4 (b), when input current signal IA1 true amplitude exceedes positive threshold voltage or negative amplitude exceedes negative threshold voltage, window comparator output signal VA0 exports high level; When input current signal IA1 is not above threshold voltage, window comparator output signal VA0 output low level. In like manner; input current signal respectively IB1 and the IC1 that B phase, C are corresponding, corresponding output signal respectively VB0 and VC0, if VA0, VB0 and VC0 three-phase has arbitrary phase generation overcurrent, export high level; now send interruption application to microprocessor, protect.
Described pulse separation output circuit is made up of A phase, B phase, home pulse separation output circuit, as it is shown in figure 5, for A phase, A phase pulse separation output circuit is by NAND gate U4A-U4C, resistance R6, R7, electric capacity C6, C7, and diode D6, D7 form. Two inputs of NAND gate U4A be connected with an input of NAND gate U4B after as the input of A phase pulse separation output circuit, an input of the output termination NAND gate U4C of NAND gate U4A; One end of resistance R6, one end of electric capacity C6 are connected with the positive pole of diode D6 and are followed by another input of NAND gate U4B; Another termination+5V power supply of resistance R6; One end of resistance R7, one end of electric capacity C7 are connected with the positive pole of diode D7 and are followed by another input of NAND gate U4C; Another termination+5V power supply of resistance R7; The other end of electric capacity C6 be connected with the other end of electric capacity C7 after ground connection; The negative pole of diode D6 be connected with the outfan of NAND gate U4C after as the input of the lower brachium pontis of A phase of impulsive quarantine amplifying circuit; The negative pole of diode D7 be connected with the outfan of NAND gate U4B after as the input of brachium pontis in the A phase of impulsive quarantine amplifying circuit; B phase is identical with A phase with the pulse separation output circuit of C phase.
As shown in Figure 6, the A phase PWMA signal of microprocessor output receives A phase pulse-separating circuit input, anti-phase through NAND gate U4A, become B signal, PWMA signal and B signal are coupled with an input of NAND gate U4B and U4C, another input D of another input C and NAND gate U4C of NAND gate U4B respectively with resistance R6, electric capacity C6, resistance R7, the delay circuit that electric capacity C7 is constituted connects, and outfan PWMAB and the PWMAT of U4C and U4B it is cross connected to through diode D6 and D7, when PWMAT is uprised level by low level, D end just can become high level after the delay circuit delays a period of time being made up of resistance R7 and electric capacity C7, so that the outfan PWMAB of U4C to postpone a period of time step-down level, the ON time making the IGBT switching tube of brachium pontis under A phase extends time T than the turn-off time of upper brachium pontisd; Otherwise, when PWMAB is uprised level by low level, C end just can become high level after the delay circuit delays a period of time being made up of resistance R6 and electric capacity C6, so that the outfan PWMAT of U4B to postpone a period of time step-down level so that in A phase, the ON time of the IGBT switching tube of brachium pontis extends time T than the turn-off time of lower brachium pontisd; So, the A phase pwm signal PWMA of microprocessor output, isolates upper brachium pontis signal PWMAT and lower brachium pontis signal PWMAB, and upper brachium pontis signal PWMAT and lower brachium pontis signal PWMAB keeps Dead Time T through A phase pulse-separating circuitdNot overlapping.
Described impulsive quarantine amplifying circuit has six tunnels, six IGBT switching tubes of corresponding main circuit three-phase IGBT inverter respectively, brachium pontis in A phase, as it is shown in fig. 7, brachium pontis impulsive quarantine amplifying circuit is by Quick photoelectric bonder U3 in A phase, resistance R11-R14, electric capacity C11, C12, diode D11, stabilivolt DW1, DW2, PNP triode Q11, NPN audion Q12 forms. Quick photoelectric bonder U3 can adopt HCPL-4504 type product. Positive input termination+5V the power supply of Quick photoelectric bonder U3, the upper brachium pontis signal of negative input termination A phase pulse separation output circuit; The power end of Quick photoelectric bonder U3 and one end of resistance R11, one end of resistance R12, one end of electric capacity C11, PNP triode Q11 emitter stage be connected the positive pole VA+ of the road 24V power supply being followed by the second control power supply output; The collector output of Quick photoelectric bonder U3, one end of resistance R13 are connected with the negative pole of diode D11, the positive pole of diode D11, the negative pole of stabilivolt DW2 are connected with the other end of resistance R12, and the other end of resistance R11, the other end of electric capacity C11, the negative pole of stabilivolt DW1 are connected in main circuit A phase after being connected the emitter stage of brachium pontis IGBT switching tube with the emitter stage outfan of Quick photoelectric bonder U3; The other end of R13 is connected with the base stage of PNP triode Q11; The positive pole of stabilivolt DW2 connects the base stage of NPN audion Q12, the negative pole VA-of the positive pole of stabilivolt DW1 and the emitter stage Jun Jiegai road 24V power supply of NPN audion Q12; After electric capacity C12 and resistor coupled in parallel one termination PNP triode Q11 colelctor electrode, the other end be connected with the colelctor electrode of NPN audion Q12 after as the gate pole of brachium pontis IGBT switching tube in A phase. 24V power supply is divided into+15V and-9V by resistance R11, electric capacity C11 and stabilivolt DW1; Quick photoelectric bonder U3 receives the pulse signal PWMAT of A phase pulse separation output circuit output, it it is useful signal when PWMAT is low level, the now output triode conducting of Quick photoelectric bonder U3, through resistance R13, PNP triode Q11 is turned on, and NPN audion Q12 turns off, export driving pulse VG1 through resistance R14 and electric capacity C12 to brachium pontis IGBT switching tube in major loop A phase so that IGBT switching tube turns on; When pulse signal PWMAT is high level, the output triode of photoelectrical coupler U3 turns off, and PNP triode Q11 turns off, and NPN audion Q12 base stage obtains through resistance R12 and stabilivolt DW2 and drives current lead-through, VG1 is moved to-9V, so that IGBT switching tube turns off.
Two, software design principle
1, based on the SVPWM operation principle of 18 pulses
Main circuit as shown in Figure 2, output Converting Unit is three phase inverter bridge, by the phase voltage V of A, B, C three-phase outputA(t)��VB(t)��VC(t), it is possible to constitute space vector of voltage Vs:
Vs=VA(t)+VB(t)ej��+VC(t)ej2��(1)
Wherein ��=120 ��, there are 100,110,010,011,001,101 and 2 zero duties 000,111 of 6 effective duties, corresponding 6 effective basic vectors and two zero vectors, 6 effective basic vectors are: V1=VR �� 0 ��, V2=VR �� 60 ��, V3=VR �� 120 ��, V4=VR �� 180 ��, V5=VR �� 240 ��, V6=VR �� 300 ��, VR=Vdc, VR are the radius of space voltage vector, Vdc is the DC voltage of inverter direct-flow side, and the length of 6 effective basic vectors is VR. 6 effective basic vectors divide the plane into six sectors: one, two, three, four, five, six, and each sector is further added by two resultant vectors, then constitute 18 vectors in a cycle, as shown in Figure 8. In 18 voltage vectors, except 6 effective basic voltage vectors, other 12 voltage vectors are by 6 effective basic vectors and two zero vector synthesis. 18 voltage vectors, each voltage vector working time is T/18, T is the cycle of output voltage, when output voltage frequency is fixed as 50Hz, T=20ms. When increasing output voltage amplitude, then making the active voltage vector working time increase, the Zero voltage vector working time shortens; When reducing output voltage amplitude, then making the active voltage vector working time shorten, the Zero voltage vector working time increases.
The composition principle of lower surface analysis the first sector space vector of voltage, as shown in Figure 9.
For the resultant vector V11=VR �� 20 �� of the first sector, by two adjacent basic effectively vector V1 and V2 and zero vector V0 synthesis, V1 and V2 is T1 and T2, V0 action time action time respectively is T0. According to impulse equivalency principle:
VR �� TP=V1 �� T1+V2 �� T2
Wherein TP is PWM carrier cycle, i.e. the working time of each vector, under 50Hz fixed frequency, and TP=20ms/6/3=1.111ms. In triangle OAB, according to sine:
Thus can obtain:
Wherein, V1 and TP is constant, and V1 is the length of basic vector, V1=Vdc, and M=VR/V1 is called the index of modulation, and M can determine according to the amplitude of expection output voltage.
In like manner can obtain:
T2=M �� TP �� 0.395 (3)
The Zero voltage vector working time:
T0=TP-T1-T2 (4)
For the resultant vector V12 of the first sector, also according to impulse equivalency principle, it is thus achieved that T1=M �� TP �� 0.395, T2=M �� TP �� 0.7422, just with the time tie of V11. For V11, T1>T2, for V12, T1<T2.
For basis vector V1, only V1 work, V2 does not work, so T2=0. Can be obtained by pulse equivalency formula VR �� TP=V1 �� Tb:
Tb=M �� TP (5)
Wherein, Tb is V1 time when working independently.
Resultant vector V11, V12 adopt 5 sections of symmetrical pulse t1-t5Realizing, its impulse waveform is as shown in Figure 10. Basic vector V1 adopts 3 sections of symmetrical pulse t1-t3Realizing, its impulse waveform is as shown in figure 11.
For fixing voltage magnitude, burst length amount only has three values: T1, T2 and Tb. The principle of all the other each sectors is identical with the first sector, and the burst length computational methods of amount are identical with the first sector. The voltage vector in one cycle is combined one vector time circle diagram of formation with time quantum, and as shown in figure 12, exradius is time quantum Tb, and inner circle radius is time quantum T2, and the radius of middle circle is time quantum T1.
2, voltage close loop control principle
Figure 13 show the loop control theory block diagram of output voltage, Keyboard Setting output voltage desired value, calculates intended index of modulation M*; By output voltage detecting circuit sampling and outputting voltage actual value, compare with desired value, try to achieve voltage deviation �� U, then pass through scale operation and try to achieve the offset �� M of index of modulation M, �� M=Kp �� �� U, final index of modulation M=M*+ �� M, delivers to M value in SVPWM module, calculates pulse width. Kp value obtains according to many experiments, Kp=0.528.
3, ideas on software design:
1) two intervalometers are set: intervalometer 1 and timer 2;
2) intervalometer 1 completes the time timing of T/18, and timing constant is carrier cycle TP. Every three carrier cycles are a sector. In the interrupt routine of intervalometer 1, completing the renewal of 18 voltage vectors, the initial period of each voltage vector, output voltage vector V0 (000), start timer 2 simultaneously, timing is set to t1;
3) timer 2 completes 4 minor time slice t of each voltage vector2��t5Change time timed task, the time period of sector residing for voltage vector and correspondence thereof determines to need the vector of output. Such as Fig. 9, shown in 10, in the first sector, work vector is V1, V2, at t2=T1/2 the time period, output vector is V1 (100). At t3=T2 the time period, output vector is V2 (110), at t4=T1/2 the time period, output vector is V1 (100), at t5=T0/2 the time period, output vector is V0 (000), t5Being timed to, this resultant vector terminates, and waiting timer 1 starts the beginning of next resultant vector. In the second sector, work vector is V3, V2, at t2=T2/2 the time period, output vector is V3 (010). At t3=T1 the time period, output vector is V2 (110), at t4=T2/2 the time period, output vector is V3 (010), at t5=T0/2 the time period, output vector is V0 (000), t5Being timed to, this resultant vector terminates, and waiting timer 1 starts the beginning of next resultant vector, and the rest may be inferred by analogy for it. In vectors switching process, the problem in commutation dead band is given pulse separation output circuit in the present system and is completed, and does not consider during software design.
4) software program is mainly made up of mastery routine, intervalometer 1 interrupt service subroutine, timer 2 interrupt service subroutine, error protection interruption subroutine, respectively as shown in Figure 14, Figure 15, Figure 16, Figure 17.
Claims (6)
1. the SVPWM Three-phase electronic pressure regulator based on 18 pulses, it is characterized in that, control power supply including main circuit, central control circuit, output voltage detecting circuit, over-current detection circuit, impulsive quarantine amplifying circuit, Key and display circuit, the first control power supply and second. described main circuit includes the uncontrollable commutator of three-phase, DC filter and the three-phase IGBT inverter that are sequentially connected, described central control circuit includes microprocessor and pulse separation output circuit, described impulsive quarantine amplifying circuit includes photoelectric coupling isolation circuit and pulse amplifying circuit, described first control power supply is that central control circuit, output voltage detecting circuit, over-current detection circuit and Key and display circuit are powered, described second control power supply is that impulsive quarantine amplifying circuit is powered, the alternating current power supply of the three-phase constant frequency and constant voltage of electrical network is input to main circuit, is transformed to the alternating current of constant frequency transformation through main circuit, and three-phase alternating current load is arrived in output, Key and display circuit inputs intended output voltage values to central control circuit by man-machine interface, output voltage detecting circuit detects the output voltage of main circuit three-phase IGBT inverter and feeds back to microprocessor, overcurrent sensing circuit detects the output electric current of main circuit three-phase IGBT inverter and feeds back to microprocessor, the pulse calculated according to 18 pulse SVPWM principles is input to pulse separation output circuit by being separated by microprocessor, then impulsive quarantine amplifying circuit is delivered in the pulse after separation and be amplified isolation, it is then sent through main circuit, control the three-phase IGBT inverter of main circuit, the three-phase alternating current of output constant frequency transformation.
2. a kind of SVPWM Three-phase electronic pressure regulator based on 18 pulses according to claim 1, it is characterized in that, described output voltage detecting circuit includes diode rectification module U1, electric capacity C1-C4, resistance R1, R2, potentiometer RP1 and analog voltage isolated amplifier U2; The three-phase output voltage of main circuit three-phase IGBT inverter receives the AC of diode rectification module U1, diode rectification module U1 DC side output DC voltage, filter through electric capacity C1 and C2, bleeder circuit dividing potential drop through resistance R1, potentiometer RP1 and resistance R2 composition, output voltage is obtained from potentiometer two ends, giving analog voltage isolated amplifier U2 then through electric capacity C3 filtering, the output voltage of analog voltage isolated amplifier U2 is followed by the input end of analog signal mouth of microprocessor through electric capacity C4 filtering.
3. a kind of SVPWM Three-phase electronic pressure regulator based on 18 pulses according to claim 1, it is characterized in that, described overcurrent sensing circuit is formed in parallel by A phase, B phase, C phase three-phase window comparator, every phase structure is identical, for A phase, A phase window comparator is by resistance RA1-RA4, potentiometer RPA, operational amplifier U6A, diode DA1-DA3 form; The negative pole of diode DA1 be connected with the positive pole of diode DA2 after as the input of window comparator, one end of the positive pole connecting resistance RA1 of diode DA1, the other end of resistance RA1 is connected with the adjustable end of potentiometer RPA and is followed by the negative input end of operational amplifier U6A, one termination+12V the power supply of potentiometer RPA, other end ground connection; One end of the negative pole connecting resistance RA2 of diode DA2, the other end of resistance RA2 is connected with one end of resistance RA3 and is followed by the positive input terminal of operational amplifier U6A, the other end ground connection of resistance RA3; The positive pole of resistance RA4 and diode DA3 is connected and is followed by the outfan of operational amplifier U6A, positive supply termination+12V the power supply of operational amplifier U6A, negative supply termination-12V power supply, another termination+12V power supply of resistance RA4, the negative pole of diode DA3 is as the outfan of window comparator. The output A phase current of main circuit three-phase IGBT inverter receives the input of window comparator through the current signal IA1 that current transformer exports. Determined the positive threshold of window comparator by resistance RA2, RA3, determined the negative threshold of window comparator by RPA; When input current signal IA1 true amplitude exceedes positive threshold voltage or negative amplitude exceedes negative threshold voltage, window comparator output signal VA0 exports high level; When input current signal IA1 is not above threshold voltage, window comparator output signal VA0 output low level. In like manner; input current signal respectively IB1 and the IC1 that B phase, C are corresponding, corresponding output signal respectively VB0 and VC0, if VA0, VB0 and VC0 three-phase has arbitrary phase generation overcurrent, export high level; now send interruption application to microprocessor, protect.
4. a kind of SVPWM Three-phase electronic pressure regulator based on 18 pulses according to claim 1, it is characterized in that, described pulse separation output circuit is made up of A phase, B phase, home pulse separation output circuit, for A phase, A phase pulse separation output circuit is by NAND gate U4A-U4C, resistance R6, R7, electric capacity C6, C7, diode D6, D7 form. two inputs of NAND gate U4A be connected with an input of NAND gate U4B after as the input of A phase pulse separation output circuit, an input of the output termination NAND gate U4C of NAND gate U4A, one end of resistance R6, one end of electric capacity C6 are connected with the positive pole of diode D6 and are followed by another input of NAND gate U4B, another termination+5V power supply of resistance R6, one end of resistance R7, one end of electric capacity C7 are connected with the positive pole of diode D7 and are followed by another input of NAND gate U4C, another termination+5V power supply of resistance R7, the other end of electric capacity C6 be connected with the other end of electric capacity C7 after ground connection, the negative pole of diode D6 be connected with the outfan of NAND gate U4C after as the input of the lower brachium pontis of A phase of impulsive quarantine amplifying circuit, the negative pole of diode D7 be connected with the outfan of NAND gate U4B after as the input of brachium pontis in the A phase of impulsive quarantine amplifying circuit, B phase is identical with A phase with the pulse separation output circuit of C phase. the A phase PWMA signal of microprocessor output receives A phase pulse-separating circuit input, anti-phase through NAND gate U4A, become B signal, PWMA signal and B signal are coupled with an input of NAND gate U4B and U4C, another input D of another input C and NAND gate U4C of NAND gate U4B respectively with resistance R6, electric capacity C6, resistance R7, the delay circuit that electric capacity C7 is constituted connects, and outfan PWMAB and the PWMAT of U4C and U4B it is cross connected to through diode D6 and D7, when PWMAT is uprised level by low level, D end just can become high level after the delay circuit delays a period of time being made up of resistance R7 and electric capacity C7, so that the outfan PWMAB of U4C to postpone a period of time step-down level, the ON time making the IGBT switching tube of brachium pontis under A phase extends time T than the turn-off time of upper brachium pontisd; When PWMAB is uprised level by low level, C end just can become high level after the delay circuit delays a period of time being made up of resistance R6 and electric capacity C6, so that the outfan PWMAT of U4B to postpone a period of time step-down level so that in A phase, the ON time of the IGBT switching tube of brachium pontis extends time T than the turn-off time of lower brachium pontisd��
5. a kind of SVPWM Three-phase electronic pressure regulator based on 18 pulses according to claim 1, it is characterized in that, described impulsive quarantine amplifying circuit has six tunnels, respectively six IGBT switching tubes of corresponding main circuit three-phase IGBT inverter, brachium pontis in A phase, in A phase, brachium pontis impulsive quarantine amplifying circuit is by Quick photoelectric bonder U3, resistance R11-R14, electric capacity C11, C12, diode D11, stabilivolt DW1, DW2, PNP triode Q11, NPN audion Q12 forms. Positive input termination+5V the power supply of Quick photoelectric bonder U3, the upper brachium pontis signal of negative input termination A phase pulse separation output circuit; The power end of Quick photoelectric bonder U3 and one end of resistance R11, one end of resistance R12, one end of electric capacity C11, PNP triode Q11 emitter stage be connected the positive pole VA+ of the road 24V power supply being followed by the second control power supply output; The collector output of Quick photoelectric bonder U3, one end of resistance R13 are connected with the negative pole of diode D11, the positive pole of diode D11, the negative pole of stabilivolt DW2 are connected with the other end of resistance R12, and the other end of resistance R11, the other end of electric capacity C11, the negative pole of stabilivolt DW1 are connected in main circuit A phase after being connected the emitter stage of brachium pontis IGBT switching tube with the emitter stage outfan of Quick photoelectric bonder U3; The other end of R13 is connected with the base stage of PNP triode Q11; The positive pole of stabilivolt DW2 connects the base stage of NPN audion Q12, the negative pole VA-of the positive pole of stabilivolt DW1 and the emitter stage Jun Jiegai road 24V power supply of NPN audion Q12; After electric capacity C12 and resistor coupled in parallel one termination PNP triode Q11 colelctor electrode, the other end be connected with the colelctor electrode of NPN audion Q12 after as the gate pole of brachium pontis IGBT switching tube in A phase. 24V power supply is divided into+15V and-9V by resistance R11, electric capacity C11 and stabilivolt DW1; Quick photoelectric bonder U3 receives the pulse signal PWMAT of A phase pulse separation output circuit output, it it is useful signal when PWMAT is low level, the now output triode conducting of Quick photoelectric bonder U3, through resistance R13, PNP triode Q11 is turned on, and NPN audion Q12 turns off, export driving pulse VG1 through resistance R14 and electric capacity C12 to brachium pontis IGBT switching tube in major loop A phase so that IGBT switching tube turns on; When pulse signal PWMAT is high level, the output triode of photoelectrical coupler U3 turns off, and PNP triode Q11 turns off, and NPN audion Q12 base stage obtains through resistance R12 and stabilivolt DW2 and drives current lead-through, VG1 is moved to-9V, so that IGBT switching tube turns off.
6. a kind of SVPWM Three-phase electronic pressure regulator based on 18 pulses according to claim 1, it is characterised in that the handling process of described microprocessor is as follows:
(1) Key and display circuit provides output voltage desired value, calculates intended index of modulation M*; By output voltage detecting circuit sampling and outputting voltage actual value, compare with desired value, try to achieve voltage deviation �� U, then pass through scale operation and try to achieve the offset �� M of the index of modulation, �� M=Kp �� �� U, Kp is proportionality coefficient, final index of modulation M=M*+ �� M, M value is delivered in SVPWM module.
(2) pulse width T 1 of 18 pulses, T2 and Tb are calculated by SVPWM module, particularly as follows:
A, B, C three-phase phase voltage exported by main circuit constitutes space vector of voltage, corresponding 6 the effective basic vectors of space vector of voltage and two zero vectors, 6 effective basic vectors divide the plane into six sectors, each sector is further added by two resultant vectors, constitutes 18 voltage vectors in a cycle, and each voltage vector working time is TP=T/18, T is the cycle of output voltage, when output voltage frequency is fixed as 50Hz, T=20ms, TP=1.111ms.
The synthetic method of each sector space vector of voltage is identical, for the first sector, specific as follows:
The first resultant vector V11=VR �� 20 �� for the first sector, by two adjacent basic effectively vector V1 and V2 and zero vector V0 synthesis, V1 and V2 is T1 and T2, V0 action time action time respectively is T0, VR is the length of space voltage vector, i.e. voltage desired value. Can obtain according to impulse equivalency principle: T1=M �� TP �� 0.7422; Wherein M=VR/V1, is called the index of modulation, and M can determine according to the amplitude of expection output voltage. In like manner can obtain: T2=M �� TP �� 0.395; Zero voltage vector working time T0=TP-T1-T2;
For the second resultant vector V12 of the first sector, also according to impulse equivalency principle, it is thus achieved that T1=M �� TP �� 0.395, T2=M �� TP �� 0.7422.
For basic vector V1, only V1 work, V2 does not work, so T2=0. Can be obtained by impulse equivalency principle: Tb=M �� TP; Tb is basic vector V1 time when working independently.
Resultant vector V11, V12 adopt 5 sections of symmetrical pulse t1-t5Realizing, basic vector V1 adopts 3 sections of symmetrical pulse t1-t3Realize.
(3) two intervalometers are set: intervalometer 1 and timer 2; Intervalometer 1 completes the time timing of TP. In the interrupt routine of intervalometer 1, completing the renewal of 18 voltage vectors, at the initial period of each voltage vector, output voltage vector V0, start timer 2 simultaneously, the timing of timer 2 is set to t1=T0/2; Timer 2 completes each voltage vector 4 time period t of residue2��t5Change time timed task, the time period of sector residing for voltage vector and correspondence thereof determines to need the vector of output, each sector to realize principle identical. For the first sector, work vector is V1, V2, at t2=T1/2 the time period, output vector is V1. At t3=T2 the time period, output vector is V2, at t4=T1/2 the time period, output vector is V1, at t5=T0/2 the time period, output vector is V0, t5Being timed to, this resultant vector terminates, and waiting timer 1 starts the beginning of next resultant vector, and so circulation constitutes 18 pulse SVPWM control processes.
(4) being realized the adjustment of main circuit output voltage by 18 pulse SVPWM modules: when increasing output voltage amplitude, then make the active voltage vector working time increase, the Zero voltage vector working time shortens; When reducing output voltage amplitude, then making the active voltage vector working time shorten, the Zero voltage vector working time increases.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107425587A (en) * | 2017-09-04 | 2017-12-01 | 浙江大学宁波理工学院 | Non-contact mobile type electric vehicle charge device and electrically-charging equipment |
| CN107748301A (en) * | 2017-11-24 | 2018-03-02 | 南方电网科学研究院有限责任公司 | High-voltage direct-current filter capacitor noise test loading circuit |
| CN107748301B (en) * | 2017-11-24 | 2024-05-07 | 南方电网科学研究院有限责任公司 | Noise test loading circuit of high-voltage direct-current filter capacitor |
| CN108336934A (en) * | 2018-01-03 | 2018-07-27 | 广东美芝制冷设备有限公司 | Switching method, device and the permanent magnet synchronous motor of permanent-magnetic synchronous motor stator winding |
| CN108336934B (en) * | 2018-01-03 | 2020-05-08 | 广东美芝制冷设备有限公司 | Switching method and device for stator winding of permanent magnet synchronous motor and permanent magnet synchronous motor |
| CN109183106A (en) * | 2018-11-12 | 2019-01-11 | 黑龙江科技大学 | Mao power source device based on rapid track and control method |
| CN115016585A (en) * | 2022-06-30 | 2022-09-06 | 天水七四九电子有限公司 | Program-controlled direct-current power supply system |
| CN115016585B (en) * | 2022-06-30 | 2023-11-10 | 天水七四九电子有限公司 | Program-controlled direct-current power supply system |
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