CN102158100B - Triphase variable-frequency power supply with high power and operating method thereof - Google Patents
Triphase variable-frequency power supply with high power and operating method thereof Download PDFInfo
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Abstract
The invention provides a triphase variable-frequency power supply with high power and an operating method thereof, belonging to the technical field of variable-frequency power supplies. The variable-frequency power supply comprises a triphase grid input circuit, a rectifying circuit, an inverter unit, an output transformer, a direct-current (DC) bus monitoring circuit, an inverter driving circuit, an inverter output monitoring circuit, a transformer output monitoring circuit, an output switch driving circuit, a variable-frequency power supply output monitoring circuit, a digital signal processor (DSP), a keyboard and display circuit, a communication circuit, a vibration detection circuit and a protection circuit, wherein the triphase grid input circuit is connected with the rectifying circuit; the rectifying circuit is connected with the inverter unit; the inverter unit is connected with the output transformer and the DSP by the inverter driving circuit; the output transformer is connected with an output end of the power supply; and an input end and an output end of the output transformer, the output end of the power supply and the output switch are connected with the DSP. The variable-frequency power supply operates under the control of software.
Description
Technical field
The present invention relates to a kind of Three-phase high-power variable frequency power supply and method of work thereof, belong to the variable frequency power supply technical field.
Background technology
Variable frequency power supply is with the AC → DC → AC conversion of the process of the alternating current in civil power, is output as sinusoidal wave power-supply device, and its output frequency and voltage are adjustable within the specific limits, mainly adopt IGBT or IPM inversion transformation technique to realize.Generation and the control method of its pwm waveform are: at first adopt signal generating circuit to produce frequency and the certain standard sine wave of amplitude, then modulate by frequency and certain carrier wave (being generally triangular wave or sawtooth waveforms) the offset of sinusoidal ripple of amplitude, thereby the generation pwm waveform drives inverter circuit and realizes frequency conversion output.Control to the variable frequency power supply output voltage realizes by the negative-feedback circuit of output voltage feedback signal and given reference voltage signal.
Because the electromagnetic environment of variable frequency power supply work is abominable, and the electronic power switch devices such as rectifier bridge, IGBT have been used in inside, variable frequency power supply self also can produce stronger electromagnetic interference when work, particularly the electromagnetic interference of Three-phase high-power variable frequency power supply (more than 60KVA) when operation is more serious, under serious electromagnetic interference environment, the analog signals such as the standard sine wave of variable frequency power supply, carrier wave, reference voltage signal and feedback signal are vulnerable to disturb and make variable frequency power supply produce misoperation, even cause the damage of variable frequency power supply.
The application of variable frequency power supply is more and more extensive simultaneously, in recent years in the heavy-duty motor field, due to the stability of variable frequency power supply output voltage and the economic feature of environmental protection in practical application, increasing user selects variable frequency power supply to replace generator, for motor load provides power.But because the load characteristic of motor is comparatively complicated, the control method of existing variable frequency power supply is not strong to the adaptability of motor load.
In the variable frequency starting of motor is used, require the output voltage frequency of variable frequency power supply than constant, i.e. V/F=C (constant).And because motor characteristic is complicated, often need to determine according to the characterisitic parameter of motor the V/F curve of electric motor starting, existing variable frequency power supply voltage and frequency can not be regulated simultaneously, perhaps can not control output V/F curve, can not realize variable frequency starting.During starter motor, often adopt the directly mode of startup, need the variable frequency power supply (be generally motor rated power 7 times) of larger capacity, not only cause waste economically, and cause the pollution to electrical network.Although frequency converter can be realized the variable frequency control of motor, but because the output voltage waveforms of frequency converter is not sinusoidal wave, harmonic content is higher, waveform quality is relatively poor, generally only is applied to the variable frequency regulating speed control of motor, in comprehensive load supplying occasion, application scenario as motor, illumination, equipment, instrument etc., frequency converter can cause very large interference to instrumentation, instrumentation can't be worked, thereby the range of application of frequency converter is very limited.
Because variable frequency power supply adopts the PWM inverting, include certain high-frequency harmonic composition in output voltage, its frequency spectrum is take carrier wave as first-harmonic, when high-frequency harmonic frequency spectrum and motor natural frequency near the time form resonance, can cause the vibration of motor, affect motor characteristic, reduce motor useful life.Existing variable frequency power supply can't address this problem, and perhaps can only carry out targetedly field adjustable, and change internal hardware circuit is processed, and processing scheme is difficult for implementing and not having generality and repeatability.
Patent 200710098692.8 adopts voltage space vector pulse width modulation technology (SVPWM), and this technology only is suitable for the speed of motor to be controlled, and its output voltage waveforms distortion factor is large, is not suitable for other load applications, has limitation.The inverter circuit output of patent 200710098692.8 does not have electrical isolation, there is potential safety hazard, when the inverter circuit fault, line voltage forms the loop, harm operating personnel's safety by rectifier bridge, rectification input slow start circuit, inverter circuit, load (motor).The rectification circuit of patent 200710098692.8 adopts rectifier bridge to realize, in high-power applications, due to the power factor lower (being generally 0.6 left and right) of rectifier circuit, harmonic current is large, can cause serious pollution to electrical network, and disturb the normal operation of other equipment on electrical network.Patent 200710098692.8 does not have detection feedback circuit and the control algolithm of inverter output voltage and electric current, can't realize Real-Time Monitoring and control to output voltage and electric current.
Patent 200720064002.2 is a single-phase output high voltage source, and its technical scheme can not realize three phase mains output.And exist the filter circuit complexity, comprised the Various Components such as transformer, reactor, resistance, electric capacity, thereby reliability is low, power loss is large, is not suitable for high-power applications.
In a word, there are following shortcoming and defect in existing variable frequency power supply, particularly Three-phase high-power variable frequency power supply:
1, poor anti jamming capability is vulnerable to disturb and makes variable frequency power supply produce misoperation, even causes the damage of variable frequency power supply.
2, can not control output V/F curve, realize the variable frequency starting to motor.
3, be difficult to solve the motor oscillating problem that causes because of resonance.
Summary of the invention
For the defective of prior art, the invention provides a kind of Three-phase high-power variable frequency power supply and method of work thereof.
The present invention is by real-time sampling and Treatment Analysis to variable frequency power supply output voltage and current signal, regulate the pwm waveform of variable frequency power supply, thereby realize being specially adapted to the heavy-duty motor load to the quick adjustment of variable frequency power supply output with to the real-time response of load.
The present invention regulates the V/F curve of variable frequency power supply output in real time by the vector analysis to variable frequency power supply output voltage and current signal according to the electric motor starting characteristic, realize the variable frequency starting of motor; According to Fourier transform and the analysis of motor oscillating signal at frequency domain, whether the identification motor has vibration and vibration frequency thereof, and automatically adjust within the specific limits the carrier frequency of variable frequency power supply, and do not need complicated field adjustable can avoid the natural frequency of motor, prevent the generation of motor oscillating.
A kind of Three-phase high-power variable frequency power supply comprises three phase network input circuit, rectification circuit, inversion unit, output transformer, dc bus observation circuit, inverse changing driving circuit, inversion output observation circuit, transformer output observation circuit, output switch drive circuit, variable frequency power supply output observation circuit, digital signal processor DSP, Key and display circuit, communicating circuit, vibration detection circuit and protective circuit; The three phase network input circuit is connected with rectification circuit, rectification circuit is connected with inversion unit with dc-link capacitance by soft start switch, soft start current-limiting resistance, and soft start switch, soft start current-limiting resistance are connected with dc-link capacitance and are passed through the dc bus observation circuit and be connected with digital signal processor DSP; Inversion unit is connected with output transformer, is connected with digital signal processor DSP by inverse changing driving circuit simultaneously; Output transformer is connected with power output end by output switch, the input of output transformer is connected with output and is exported observation circuit by inversion and be connected observation circuit with transformer and be connected with digital signal processor DSP, and output switch is connected with digital signal processor DSP by the output switch drive circuit; Power output end is exported observation circuit by variable frequency power supply and is connected with digital signal processor DSP; Key and display circuit, communicating circuit, vibration detection circuit and protective circuit are connected with digital signal processor DSP and are connected.
Described dc bus observation circuit, formed by photoelectrical coupler U1A, U1B and operational amplifier U2A, U2B and some resistance, electric capacity, diode, the DC bus-bar voltage signal carries out the photoelectricity isolation through U1B, form linear compensation circuit by U1A and U2A the non-linear of U1B compensated, then be connected to the ADC input port of digital signal processor DSP through the U2B voltage follower; Wherein the model of U1A, U1B is TLP521, and the model of U2A and U2B is LM358.
Described variable frequency power supply output observation circuit comprises output voltage signal observation circuit and output current signal observation circuit; Wherein the output voltage signal observation circuit is comprised of voltage transformer T1, operational amplifier U3 and resistance, electric capacity; Output voltage signal carries out electrical isolation through T1, after the differential amplifier circuit that U3 forms amplifies, is connected to the ADC input port of digital signal processor DSP; R8, R9 play metering function, and R10 is the output voltage signal sample resistance, and C3 strobes; U3 and R11, R12, R13, R14 form differential amplifier circuit jointly; Wherein the output current signal observation circuit is comprised of current transformer T2, operational amplifier U4 and some resistance, electric capacity; Output current signal carries out electrical isolation through T2, after the differential amplifier circuit that U4 forms amplifies, is connected to the ADC input port of digital signal processor DSP; R15 is the output current signal sample resistance, and C5 strobes; U4 and R16, R17, R18, R19 form differential amplifier circuit jointly, and wherein the model of U3, U4 is TL084.
Described transformer output observation circuit is comprised of voltage transformer T3, operational amplifier U5 and some resistance, electric capacity.The transformer output voltage signal carries out electrical isolation through T3, after the differential amplifier circuit that U5 forms amplifies, is connected to the ADC input port of digital signal processor DSP; R20, R21 play metering function, and R22 is the output voltage signal sample resistance, and C4 strobes; U5 and R23, R24, R25, R26 form differential amplifier circuit jointly, and wherein the model of U5 is TL084.
Described inversion output observation circuit is comprised of current transformer T4, operational amplifier U6 and some resistance, electric capacity; The inverter output current signal carries out electrical isolation through T4, after the differential amplifier circuit that U6 forms amplifies, is connected to the ADC input port of digital signal processor DSP; R27, R28 play the dividing potential drop effect, and R28 is inverter output current sample of signal resistance, and C6 strobes.U6 and R29, R30, R31, R32 form differential amplifier circuit jointly, and wherein the model of U6 is TL084.
Described inverse changing driving circuit is comprised of GPIO delivery outlet, logical circuit U10A, U10B, U10C, U10D, U11A, U11B, U11C, U11D, U12A, U12B, U12C, U12D and drive circuit U7, U8, the U9 of digital signal processor DSP; Six road pwm signals that digital signal processor DSP sends via GPIOB0, GPIOB1, GPIOB2, GPIOB3, GPIOB4, GPIOB5 produce six tunnel inversions and drive signals after logical circuit and drive circuit, are used for driving inversion unit; OCP is the overcurrent protection signal, turn-offs pwm signal when being used for fault; GPIOB8 is for starting stop control signal, and the startup that is used for variable frequency power supply output stops controlling; Wherein the model of U10A, U10B, U10C, U10D, U11A, U11B, U11C, U11D, U12A, U12B, U12C, U12D is 74HC08, and the model of U7, U8, U9 is MC34152.
Described vibration detection circuit is comprised of acceleration transducer T5, operational amplifier U13 and some resistance, electric capacity.The motor oscillating signal carries out electrical isolation through T5, after the differential amplifier circuit that U13 forms amplifies, is connected to the ADC input port of digital signal processor DSP.R33 is motor oscillating sample of signal resistance, and C7 strobes.U13 and R34, R35, R36, R37 form differential amplifier circuit jointly, and wherein the model of U13 is TL084.
Described digital signal processor DSP is integrated circuit TMS320F2812.
A kind of method of work of Three-phase high-power variable frequency power supply comprises variable frequency starting control method and carrier frequency adjustment control method;
The variable frequency starting control method is as follows:
1) rated voltage and the rated frequency of motor are set;
2) starting resistor and the startup frequency of motor are set;
3) start variable frequency power supply output;
4) under the startup frequency that arranges, the quick boosted output voltages of variable frequency power supply is to the starting resistor that arranges;
The output voltage of 5) computational analysis variable frequency power supply and output current;
6) according to the starting characteristic parameter of motor, improve gradually the output frequency of variable frequency power supply and rated frequency and the rated voltage that output voltage extremely arranges according to given V/F curve; In frequency conversion and pressure regulation process, by the real-time calculation and analysis to output voltage and output current, judge whether the overcurrent impact phenomenon is arranged in motor start-up procedure, if the overcurrent impact phenomenon is arranged, suspend frequency conversion and pressure regulation, suppress the impulse current in motor start-up procedure, then improve gradually output frequency and output voltage;
7) after electric motor starting is completed, keep the output of rated voltage and rated frequency.
It is as follows that carrier frequency is adjusted control method:
1) the variable frequency power supply output current signal is carried out the ADC conversion;
2) the variable frequency power supply output current signal is carried out spectrum analysis;
3) the motor oscillating signal is carried out the ADC conversion;
4) the motor oscillating signal is carried out spectrum analysis;
5) motor oscillating signal and variable frequency power supply output current signal are carried out the spectral contrast analysis, whether the identification motor has vibration, the main spectrum component of motor oscillating, and motor oscillating mainly by which harmonic wave is caused;
6) if the motor friction do not adjust;
7) if motor has vibration, according to 5) analysis, adjust the carrier frequency of variable frequency power supply to reduce or to eliminate the vibration of motor.
Three phase network input circuit, rectification circuit and dc-link capacitance are realized the AC/DC conversion, for inversion unit provides required direct voltage.
Soft start switch and soft start current-limiting resistance are used for the charging current of dc-link capacitance is carried out current limliting, and the momentary charge electric current when powering on of preventing from starting shooting is excessive causes the damage of device and to the impact of electrical network.
Inversion unit is realized the DC/AC conversion, and the direct current of dc-link capacitance is transformed to frequency and certain alternating current and the output of amplitude.
Inverse changing driving circuit drives signal for inversion unit provides PWM, controls output frequency and the amplitude of inversion unit.
Output transformer is used for the output of inversion unit is boosted or step-down, to be fit to the motor load of different rated operational voltages.And the high-frequency harmonic that comprises in the output of filtering inversion unit.
Output switch is an electronically controlled switch, cuts off output when being used for the variable frequency power supply fault, and the disconnection variable frequency power supply is connected with load.
The output switch drive circuit is used for controlling and the driver output switch.
The dc bus observation circuit prevents that for detection of the voltage of dc-link capacitance overtension from causing capacitance damage.
Inversion output observation circuit, transformer output observation circuit, variable frequency power supply output observation circuit be used for monitoring separately output voltage and (or) current signal, and with voltage and (or) current signal delivers to digital signal processor DSP after processing and carries out computational analysis.
Digital signal processor DSP is the core that system controls, by to various voltages and (or) calculating, analysis, the processing of current signal, adopt advanced automatic control algorithm, regulate real-time dynamicly pwm waveform, realize the control to variable frequency power supply output.
Key and display circuit provides the man-machine dialogue interface of variable frequency power supply.
Communicating circuit is realized variable frequency power supply and computer remote communication.
The effect of vibration detection circuit is to detect the motor oscillating signal, and vibration signal is converted into voltage signal, so that DSP carries out analyzing and processing.
Abnormal and fault when protective circuit is used for the work of monitoring variable frequency power supply, protection variable frequency power supply internal components is not damaged and in time cuts off output.
In general structure of the present invention, the core that has adopted digital signal processor (DSP) to control as system, concrete model is the TMS320F2812 of TI company, its inside has comprised a large amount of peripheral hardware resources, periphery circuit design can be saved, by software control, 6 road pwm signals can be directly produced, make the generation of pwm signal and drive and realize total digitalization, greatly improved reliability and the antijamming capability of system.
Digital signal processor has powerful calculating, analysis, disposal ability, and the present invention adjusts the variable frequency power supply pwm waveform in real time by calculating, analysis, processing to multi-signal, can greatly improve workload-adaptability and the response speed of variable frequency power supply.The load characteristic that the present invention is directed to motor realizes the variable frequency starting of motor, reduced the rated capacity requirement of electric motor starting to variable frequency power supply and system power thereof, when having reduced simultaneously electric motor starting to the rush of current of electrical network, to the harmonic pollution of electrical network, have good economy and social effect when having reduced electric motor starting.The present invention does not need complicated field adjustable can avoid the natural frequency of motor by the automatic adjustment to the outgoing carrier frequency, prevents motor oscillating, and the workload-adaptability of variable frequency power supply is improved greatly.
Description of drawings
Fig. 1 is general structure block diagram of the present invention.
Fig. 2 is dc bus observation circuit figure of the present invention.
Fig. 3 is variable frequency power supply output voltage signal observation circuit figure of the present invention.
Fig. 4 is variable frequency power supply output current signal observation circuit figure of the present invention.
Fig. 5 is transformer output observation circuit figure of the present invention.
Fig. 6 is inversion output observation circuit figure of the present invention.
Fig. 7 is inverse changing driving circuit figure of the present invention.
Fig. 8 is that pwm signal of the present invention produces schematic diagram.
Fig. 9 is vibration detection circuit figure of the present invention.
Figure 10 is variable frequency starting control algolithm program flow diagram of the present invention.
Figure 11 is that carrier frequency of the present invention is adjusted the control algolithm program flow diagram.
wherein, 1, the three phase network input circuit, 2, rectification circuit, 3, soft start switch, 4, the soft start current-limiting resistance, 5, dc-link capacitance, 6, inversion unit, 7, output transformer, 8, output switch, 9, the dc bus observation circuit, 10, inverse changing driving circuit, 11, inversion output observation circuit, 12, transformer output observation circuit, 13, the output switch drive circuit, 14, variable frequency power supply output observation circuit, 15, digital signal processor DSP, 16, Key and display circuit, 17, communicating circuit, 18, vibration detection circuit, 19, protective circuit.
Embodiment
The present invention is described in detail below in conjunction with drawings and Examples.
Embodiment:
Fig. 1 is general structure block diagram of the present invention, carry out the AC/DC conversion from the three-phase electricity of electrical network input through rectification circuit (2), and through starting current-limiting resistance (4), dc-link capacitance (5) is charged, start current-limiting resistance and play the effect of charging current being carried out current limliting, the momentary charge electric current when powering on of preventing from starting shooting is excessive causes the damage of device and to the impact of electrical network.In charging, measure voltage on dc-link capacitance (5) by dc bus observation circuit (9), when charging voltage reaches 90% when above of rated value, closed soft start switch (3) will start current-limiting resistance (4) short circuit.Inversion unit (6) is realized the DC/AC conversion, and the direct current of dc-link capacitance (5) is transformed to frequency and the certain alternating current of amplitude.The output of inversion unit (6) is boosted or step-down through output transformer (7), is load (as motor) power supply after output switch (8).Inversion output observation circuit (11), transformer output observation circuit (12), variable frequency power supply output observation circuit (14) be used for monitoring separately output voltage and (or) current signal, and with voltage and (or) current signal delivers to digital signal processor DSP (15) after processing and carries out computational analysis.Vibration detection circuit (18) detects the motor oscillating signal, and vibration signal is converted into voltage signal, so that digital signal processor DSP (15) carries out analyzing and processing.Digital signal processor DSP (15) calculates the signal of input, analyze, process, regulate in real time inner PWM according to load characteristic, drive signal through inverse changing driving circuit (10) for inversion unit (6) provides PWM, control output frequency and the amplitude of inversion unit (6).
Fig. 2 is dc bus observation circuit figure, is used for measuring the DC bus-bar voltage of variable frequency power supply.The voltage signal of dc-link capacitance (5) is connected to input anode and the negative electrode of photoelectrical coupler U1B through C1 filtering and R1, R2 current limliting; the effect of diode D1 is that protection U1B is not damaged when the direct voltage reverse polarity connection; photoelectrical coupler U1A, U1B and operational amplifier U2A; and peripheral circuit R3, R4, R5, R6, R7, C2 form the linear optical coupling circuit, non-linear with compensating light electric coupling current transfer ratio.Through foregoing circuit, realize that the photoelectricity of DC bus-bar voltage isolates and be converted into the voltage signal of 0～3V, after operational amplifier U2B carries out voltage follow, be connected to the ADC passage of DSP.
Fig. 3 is variable frequency power supply output observation circuit figure (voltage signal), is used for the measurement of variable frequency power supply output voltage signal, because the three-phase output voltage observation circuit of variable frequency power supply is identical, only take A mutually as the example explanation.Variable frequency power supply A phase output voltage is through R8, R9 current limliting, be connected to the primary coil of T1 instrument transformer, after T1 isolation and R10 sample resistance, be converted into 0～3V signal, after the differential amplifier that U3, R11, R12, R13, R14 form, be connected to the ADC passage of DSP.
Fig. 4 is variable frequency power supply output observation circuit figure (current signal), is used for the measurement of variable frequency power supply output current signal, because the three-phase output current observation circuit of variable frequency power supply is identical, only take A mutually as the example explanation.Variable frequency power supply A phase output current after T2 isolation and R15 sample resistance, is converted into 0～3V signal through the primary coil of T2 instrument transformer, after the differential amplifier that U4, R16, R17, R18, R19 form, is connected to the ADC passage of DSP.
Fig. 5 is transformer output observation circuit figure, is used for the measurement of transformer output voltage signal, because the three-phase output voltage observation circuit of transformer is identical, only take A mutually as the example explanation.Transformer A phase output voltage is through R20, R21 current limliting, be connected to the primary coil of T3 instrument transformer, after T3 isolation and R22 sample resistance, be converted into 0～3V signal, after the differential amplifier that U5, R23, R24, R25, R26 form, be connected to the ADC passage of DSP.
Fig. 6 is inversion output observation circuit figure, is used for the measurement of inversion unit output current signal, because the three-phase output current observation circuit of inversion unit is identical, only take A mutually as the example explanation.Inversion unit A phase output current is converted into the voltage signal of 0～4V through Hall current sensor T4, after R27, R28 electric resistance partial pressure, be converted into 0～3V signal, after the differential amplifier that U5, R29, R30, R31, R32 form, is connected to the ADC passage of DSP.
Fig. 9 is vibration detection circuit figure, is used for the measurement of motor oscillating signal.The vibration signal of motor is converted into the current signal of 0～20mA through acceleration transducer (the Lance LC01 of company series) T5, after the R33 sample resistance, be converted into 0～3V signal, after the differential amplifier that U13, R34, R35, R36, R37 form, be connected to the ADC passage of DSP.
Operational amplifier in above circuit all uses high precision operating amplifier OP07.
The concrete model of digital signal processor (DSP) is the TMS320F2812 of TI company, TMS320F2812 is 32 powerful fixed DSPs that TI company releases, have the adc data collection of EVA, EVB task manager and 12 16 passages, and abundant Peripheral Interface, as CAN, SCI etc.Make it be highly suitable for Electric Machine Control.
The below is output as example mutually with A, and the production process of three-phase digital PWM is described.
As shown in Figure 8, use the task manager EVB of DSP inside, adopt the method for numeral to produce required PWM waveform.EVB counter T3CNT is operated in automatic increase and decrease counting mode, produce symmetrical PWM, counter T3CNT begins operating in from 0 and increases counting mode, when count value and EVB period register T3PR coupling, automatically change into and subtract counting mode, when count value is 0, automatically changes into and increase counting mode, so circulation, the triangular carrier of generation PWM.Carrier cycle is 2 times of period register T3PR periodic quantity, and in application example of the present invention, the carrier cycle initial value is 4KHz, and the dsp system clock is 120MHz,
The sinusoidal wave built-in function QSIN (x) that provides by TI calculates and produces, be the simplified operation amount, improve program operation speed, wavetable data after calculating is stored in array sin_tab[] in, program produces and interrupts when counter T3CNT and period register T3PR cycle mate, in interrupt routine with sin_tab[] the wave table value configures the comparand register CMPR3 to task manager EVB.Task manager compares the value of T3CNT and CMPR3 automatically, thereby produces the PWM waveform.
The a pair of complementary PWM waveform that digital signal processor (DSP) produces is by GPIOB0 and two delivery outlet outputs of GPIOB1, after logic control circuit (U12A, U12B, U12C, U12D) and drive circuit (U7), formation can drive pwm waveform PWM1 and the PWM2 of inversion unit.As shown in Figure 7.
B phase and the C production process of digital PWM mutually are mutually identical with A.Control sinusoidal wave frequency and amplitude in program and can control frequency and the amplitude of variable frequency power supply output voltage.
When motor frequency conversion starts, at first need to arrange rated voltage (as 380V) and the rated frequency (as 50Hz) of motor, then the starting resistor (as 228V) of motor is set and starts frequency (as 30Hz).After starting variable frequency power supply output, the variable frequency power supply output frequency is 30Hz, and voltage rises to 228V from 0.Then according to the starting characteristic parameter of motor, improve output frequency and output voltage to rated value according to given V/F curve.In frequency conversion and pressure regulation process, by the real-time calculation and analysis to output voltage and output current, judge whether the overcurrent impact phenomenon is arranged in motor start-up procedure, if the overcurrent impact phenomenon is arranged, stop frequency conversion and pressure regulation, wait for after the overcurrent impact phenomenon disappears and continue again frequency conversion voltage adjusting, prevent from producing in motor start-up procedure excessive impulse current.Program flow diagram is seen Figure 10.
In motor operation course, comprise certain harmonic components due in variable frequency power supply output, when harmonic frequency and motor natural frequency near the time can cause the vibration of motor.The output harmonic wave frequency spectrum of variable frequency power supply is centered by carrier wave, and harmonic content is the highest near carrier wave, therefore can avoid the natural frequency scope of motor by adjusting the way of carrier frequency, eliminates the motor oscillating that therefore produces.The present invention detects the vibration signal of motor by acceleration transducer, calculate through DSP, analyzes the rumble spectrum of motor, and the rumble spectrum of motor and the frequency spectrum of variable frequency power supply output current are analyzed, and judges the vibration of identification motor with this.Then adjust within the specific limits the carrier frequency of variable frequency power supply to reduce or to eliminate the vibration of motor.Program flow diagram is seen Figure 11.
Claims (9)
1. Three-phase high-power variable frequency power supply, it is characterized in that, comprise three phase network input circuit, rectification circuit, inversion unit, output transformer, dc bus observation circuit, inverse changing driving circuit, inversion output observation circuit, transformer output observation circuit, output switch drive circuit, variable frequency power supply output observation circuit, digital signal processor DSP, Key and display circuit, communicating circuit, vibration detection circuit and protective circuit; The three phase network input circuit is connected with rectification circuit, rectification circuit is connected with inversion unit with dc-link capacitance by soft start switch, soft start current-limiting resistance, and soft start switch, soft start current-limiting resistance are connected with dc-link capacitance and are passed through the dc bus observation circuit and be connected with digital signal processor DSP; Inversion unit is connected with output transformer, is connected with digital signal processor DSP by inverse changing driving circuit simultaneously; Output transformer is connected with power output end by output switch, the input of output transformer is connected with output and is exported observation circuit by inversion and be connected observation circuit with transformer and be connected with digital signal processor DSP, and output switch is connected with digital signal processor DSP by the output switch drive circuit; Power output end is exported observation circuit by variable frequency power supply and is connected with digital signal processor DSP; Key and display circuit, communicating circuit, vibration detection circuit and protective circuit are connected with digital signal processor DSP and are connected.
2. a kind of Three-phase high-power variable frequency power supply as claimed in claim 1, it is characterized in that, described dc bus observation circuit, formed by photoelectrical coupler U1A, U1B and operational amplifier U2A, U2B and some resistance, electric capacity, diode, the DC bus-bar voltage signal carries out the photoelectricity isolation through U1B, form linear compensation circuit by U1A and U2A the non-linear of U1B compensated, then be connected to the ADC input port of digital signal processor DSP through the U2B operational amplifier; Wherein the model of U1A, U1B is TLP521, and the model of U2A and U2B is LM358.
3. a kind of Three-phase high-power variable frequency power supply as claimed in claim 1, is characterized in that, described variable frequency power supply output observation circuit comprises output voltage signal observation circuit and output current signal observation circuit; Wherein the output voltage signal observation circuit is comprised of voltage transformer T1, operational amplifier U3 and resistance, electric capacity; Output voltage signal carries out electrical isolation through voltage transformer T1, after the differential amplifier circuit that operational amplifier U3 forms amplifies, is connected to the ADC input port of digital signal processor DSP; Resistance R 8,9 metering functions of resistance R, resistance R 10 is the output voltage signal sample resistance, capacitor C 3 strobes; Operational amplifier U3 and resistance R 11, resistance R 12, resistance R 13, the common differential amplifier circuit that forms of resistance R 14; Wherein the output current signal observation circuit is comprised of current transformer T2, operational amplifier U4 and some resistance, electric capacity; Output current signal carries out electrical isolation through T2, after the differential amplifier circuit that operational amplifier U4 forms amplifies, is connected to the ADC input port of digital signal processor DSP; Resistance R 15 is the output current signal sample resistance, and capacitor C 5 strobes; Operational amplifier U4 and resistance R 16, resistance R 17, resistance R 18, the common differential amplifier circuit that forms of resistance R 19, wherein the model of operational amplifier U3, operational amplifier U4 is TL084.
4. a kind of Three-phase high-power variable frequency power supply as claimed in claim 1, is characterized in that, described transformer output observation circuit is comprised of voltage transformer T3, operational amplifier U5 and some resistance, electric capacity; The transformer output voltage signal carries out electrical isolation through voltage transformer T3, after the differential amplifier circuit that operational amplifier U5 forms amplifies, is connected to the ADC input port of digital signal processor DSP; Resistance R 20,21 metering functions of resistance R, resistance R 22 is the output voltage signal sample resistance, capacitor C 4 strobes; Operational amplifier U5 and resistance R 23, resistance R 24, resistance R 25, the common differential amplifier circuit that forms of resistance R 26, wherein the model of operational amplifier U5 is TL084.
5. a kind of Three-phase high-power variable frequency power supply as claimed in claim 1, is characterized in that, described inversion output observation circuit is comprised of current transformer T4, operational amplifier U6 and some resistance, electric capacity; The inverter output current signal carries out electrical isolation through T4, after the differential amplifier circuit that operational amplifier U6 forms amplifies, is connected to the ADC input port of digital signal processor DSP; Resistance R 27, resistance R 28 play the dividing potential drop effect, and resistance R 28 is inverter output current sample of signal resistance, and capacitor C 6 strobes; Operational amplifier U6 and resistance R 29, resistance R 30, resistance R 31, the common differential amplifier circuit that forms of resistance R 32, wherein the model of operational amplifier U6 is TL084.
6. a kind of Three-phase high-power variable frequency power supply as claimed in claim 1, it is characterized in that, described inverse changing driving circuit is comprised of GPIO delivery outlet, logical circuit U10A, U10B, U10C, U10D, U11A, U11B, U11C, U11D, U12A, U12B, U12C, U12D and drive circuit U7, U8, the U9 of digital signal processor DSP; Six road pwm signals that digital signal processor DSP sends via GPIOB0, GPIOB1, GPIOB2, GPIOB3, GPIOB4, GPIOB5 produce six tunnel inversions and drive signals after logical circuit and drive circuit, are used for driving inversion unit; OCP is the overcurrent protection signal, turn-offs pwm signal when being used for fault; GPIOB8 is for starting stop control signal, and the startup that is used for variable frequency power supply output stops controlling; Wherein the model of U10A, U10B, U10C, U10D, U11A, U11B, U11C, U11D, U12A, U12B, U12C, U12D is 74HC08, and the model of U7, U8, U9 is MC34152.
7. a kind of Three-phase high-power variable frequency power supply as claimed in claim 1, is characterized in that, described vibration detection circuit is comprised of acceleration transducer T5, operational amplifier U13 and some resistance, electric capacity; The motor oscillating signal carries out electrical isolation through T5, after the differential amplifier circuit that operational amplifier U13 forms amplifies, is connected to the ADC input port of digital signal processor DSP; Resistance R 33 is motor oscillating sample of signal resistance, and capacitor C 7 strobes; Operational amplifier U13 and resistance R 34, resistance R 35, resistance R 36, the common differential amplifier circuit that forms of resistance R 37, wherein the model of operational amplifier U13 is TL084.
8. a kind of Three-phase high-power variable frequency power supply as claimed in claim 1, is characterized in that, described digital signal processor DSP is integrated circuit TMS320F2812.
9. the method for work of a Three-phase high-power variable frequency power supply, comprise variable frequency starting control method and carrier frequency adjustment control method, it is characterized in that,
The variable frequency starting control method is as follows:
1) rated voltage and the rated frequency of motor are set;
2) starting resistor and the startup frequency of motor are set;
3) start variable frequency power supply output;
4) under the startup frequency that arranges, the quick boosted output voltages of variable frequency power supply is to the starting resistor that arranges;
The output voltage of 5) computational analysis variable frequency power supply and output current;
6) according to the starting characteristic parameter of motor, improve gradually the output frequency of variable frequency power supply and rated frequency and the rated voltage that output voltage extremely arranges according to given V/F curve; In frequency conversion and pressure regulation process, by the real-time calculation and analysis to output voltage and output current, judge whether the overcurrent impact phenomenon is arranged in motor start-up procedure, if the overcurrent impact phenomenon is arranged, suspend frequency conversion and pressure regulation, suppress the impulse current in motor start-up procedure, then improve gradually output frequency and output voltage;
7) after electric motor starting is completed, keep the output of rated voltage and rated frequency;
It is as follows that carrier frequency is adjusted control method:
1) the variable frequency power supply output current signal is carried out the ADC conversion;
2) the variable frequency power supply output current signal is carried out spectrum analysis;
3) the motor oscillating signal is carried out the ADC conversion;
4) the motor oscillating signal is carried out spectrum analysis;
5) motor oscillating signal and variable frequency power supply output current signal are carried out the spectral contrast analysis, whether the identification motor has vibration, the main spectrum component of motor oscillating, and motor oscillating mainly by which harmonic wave is caused;
6) if the motor friction do not adjust;
7) if motor has vibration, according to 5) analysis, adjust the carrier frequency of variable frequency power supply to reduce or to eliminate the vibration of motor.
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| CN103267945A (en) * | 2013-04-16 | 2013-08-28 | 上海电机系统节能工程技术研究中心有限公司 | Variable-frequency power source for multifunctional variable frequency motor test and waveform generation method |
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