CN104506049A - Device and method for inhibiting transient fluctuation of inverter power supply output voltage - Google Patents
Device and method for inhibiting transient fluctuation of inverter power supply output voltage Download PDFInfo
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- CN104506049A CN104506049A CN201510020967.0A CN201510020967A CN104506049A CN 104506049 A CN104506049 A CN 104506049A CN 201510020967 A CN201510020967 A CN 201510020967A CN 104506049 A CN104506049 A CN 104506049A
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- domain
- fuzzy
- filter circuit
- output voltage
- speed error
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Classifications
-
- 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
-
- 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
- H02M1/126—Arrangements for reducing harmonics from ac input or output using passive filters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a device and method for inhibiting transient fluctuation of inverter power supply output voltage, comprising an engine, a permanent magnet generator, a rectification change module, an LC filter circuit and a controller, wherein the engine is connected with the permanent magnet generator to generate alternating current, the permanent magnet generator is connected with a rectification change module, the controller is provided with a PWM output module and an A/D conversion module, the PWM output module is connected with a power conversion circuit through a driving circuit, by controlling the opening and closing thereof, a constant-frequency and constant-voltage output voltage is obtained, the voltage supplies power to a load after passing through the LC filter circuit, the A/D conversion module is connected with alternating current power supply frequency detection and direct current bus voltage detection circuits so as to respectively detect the alternating current power supply voltage state of the generator and the direct current bus voltage state of the filter circuit after filtering. The device and the method can obviously inhibit the output voltage pulsation, and improves the transient performance of an invertion device.
Description
Technical field
The present invention relates to a kind of device and method suppressing inverter output voltage transient wave.
Background technology
In some emergency service occasions, vehicular power generation system is widely used.This system generally adopts combustion gas or fuel engines to drive alternating current generator output AC power source, is then exported the AC power of constant frequency and constant voltage by commutation inversion device.Because the unexpected change of outlet side load can cause the transient wave of output voltage in actual application.If transient wave is too large, gently then affect the stability of follow-up power device, heavy then damage power consumption equipment.
Summary of the invention
The present invention is in order to solve the problem, propose a kind of device and method suppressing inverter output voltage transient wave, the method is by detecting the change of input side alternating current voltage frequency, output voltage is suppressed to fluctuate by the modulation depth of fuzzy logic ordination control SPWM in real time, there are computational methods simple, easy to use, the advantage of system rapid dynamic response speed.
To achieve these goals, the present invention adopts following technical scheme:
Suppress a device for inverter output voltage transient wave, comprise engine, permanent magnet generator, rectification change module, LC filter circuit and controller, wherein:
Engine connects permanent magnet generator, produces alternating current, and permanent magnet generator connects rectification change module, and rectification change module connects load by LC filter circuit, and controller drives rectification change module and LC filter circuit;
Described rectification change module, comprise rectification module, filter circuit and power conversion circuit, after alternating current is converted to direct current by rectification module, filter circuit carries out filtering to it, and filter circuit connects power conversion circuit;
Described controller is provided with PWM output module, A/D modular converter, described PWM output module connects power conversion circuit by drive circuit, obtain the output voltage of constant frequency and constant voltage, this voltage is powering load after LC filter circuit, and A/D modular converter receives AC supply voltage state, the filtered DC bus-bar voltage state of filter circuit of generator.
Described A/D modular converter connects current transformer by isolating amplifier circuit, and current transformer connects LC filter circuit rear end.
Described A/D modular converter connects voltage transformer by isolating amplifier circuit, and voltage transformer connects load input terminal.
Described filter circuit is connected with DC/DC converter, and DC/DC converter connects drive circuit.
Described controller is provided with power drive protection interrupt module, receives temperature protection signal, overcurrent protection signal and overvoltage protection signal.
Described controller is embedded controller or digital signal processor (DSP), electronic controller (ECU).
Based on the control method of said system, comprise the following steps:
(1) voltage effective value of the ac power frequency and self outlet side that external sampling circuit are obtained input side generator is converted to corresponding digital quantity input control device;
(2) controller forms speed error and voltage error according to setting speed reference value and actual speed sampled value by mathematical operation, and the membership function of definition speed error and speed error rate of change membership function, build fuzzy logic ordination table;
(3) change according to the mode of prefabricated fuzzy logic ordination table the transient wave that the modulation depth producing sinusoidal pulse width modulation reduces output voltage in real time.
In described step (2), for speed error E
sfuzzy set and domain be defined as follows:
E
sfuzzy set be: { NB, NM, NS, ZO, PS, PM, PB};
E
sdomain be: {-150 ,-100 ,-80 ,-60 ,-40 ,-20,0,20,40,60,80,100,150};
According to speed error E
sfuzzy set and the membership function of domain determination fuzzy variable, determine the degree of membership of domain interior element to Fuzzy Linguistic Variable, obtain speed error E
sdegree of membership.
In described step (2), for speed error rate of change EC
sfuzzy set and domain be defined as follows:
EC
sfuzzy set be: { NB, NM, NS, ZO, PS, PM, PB};
EC
sdomain be: {-150 ,-90 ,-70 ,-50 ,-30 ,-10,0,10,30,50,70,90,150};
According to speed error rate of change EC
sfuzzy set and the membership function of domain determination fuzzy variable, determine the degree of membership of domain interior element to Fuzzy Linguistic Variable, obtain speed error rate of change EC
sdegree of membership.
In described step (2), for modulation depth COEFFICIENT K
mfuzzy set and domain be defined as follows:
K
mfuzzy set be: { NB, NM, NS, ZO, PS, PM, PB};
K
mdomain be: { 0.1,0.2,0.3,0.4,0.6,0.8,1.0,1.2,1.4,1.6,1.8,2.0,2.5};
According to modulation depth COEFFICIENT K
mfuzzy set and the membership function of domain determination fuzzy variable, determine the degree of membership of domain interior element to Fuzzy Linguistic Variable, obtain modulation depth K
mdegree of membership.
In described step (2), to speed error E
s, speed error rate of change EC
s, modulation depth COEFFICIENT K
mfuzzy set, domain and degree of membership definition rule of thumb adjust; According to setting, by the commissioning experience determination modulation depth COEFFICIENT K of reality
mcontrol rule table.
In described step (2), K
mcontrol rule table be:
。
Beneficial effect of the present invention is:
(1) method is simple, easy to use, system rapid dynamic response speed;
(2) can obviously suppress output voltage to be pulsed, improve the mapping of inverter.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of emergency power supply system inverter;
Fig. 2 is load rotating speed, DC bus and output voltage effective value change schematic diagram when changing suddenly;
Output voltage waveforms comparison diagram when Fig. 3 is the different modulating degree of depth;
Fig. 4 is E
smembership function
figure;
Fig. 5 is EC
smembership function
figure;
Fig. 6 is K
mmembership function
figure.
Wherein, 1. diesel oil or petrol engine, 2. permanent magnet generator, 3. rectification module, 4. filter circuit, 5. power conversion circuit, 6.LC filter circuit, 7. load, 8. embedded controller.
Embodiment:
Below in conjunction with accompanying drawing and embodiment, the invention will be further described.
As shown in Figure 1: the schematic diagram of emergency power supply system inverter, this inverter mainly comprises the part such as diesel oil or petrol engine 1, permanent magnet generator 2, rectification module 3, filter circuit 4, power conversion circuit 5, LC filter circuit 6, load 7, embedded controller 8, input side AC power testing circuit, DC bus-bar voltage detection, drive circuit, output current detection circuit, output voltage detecting circuit.
The operation principle of inverter is as follows: the arrangement of the AC power that diesel oil or gasoline engine generator and permanent magnet generator produce in inverter and filter circuit form direct voltage, what embedded controller hardware and software program formed that SPWM control signal controls power conversion circuit by drive circuit turns on and off the output voltage obtaining constant frequency and constant voltage, and this voltage is powering load after LC filter circuit.DC bus-bar voltage detects and judges alternating voltage state in conjunction with controller.Input side AC power testing circuit is the testing circuit of this method tach signal.Output voltage, current detection circuit realize the detection to output state.
Fig. 2 is load rotating speed, DC bus and output voltage effective value change schematic diagram when changing suddenly.As shown in Figure 1, the output loading that the unexpected increase part of load 7 is test is suddenlyd change to generator speed, DC bus-bar voltage during 100% nominal load situation by zero load and reduces suddenly and output voltage effective value fluctuation situation.The output loading that the unexpected reduction part of load 7 is test is suddenlyd change to generator speed, DC bus-bar voltage during zero load by 100% nominal load to be increased suddenly and output voltage effective value fluctuation situation.
When Fig. 3 is the different modulating degree of depth, output voltage waveforms compares.In schematic diagram, upper figure is SPWM modulation depth is M
1time SPWM waveform and the sine wave of equivalence, figure below is SPWM modulation depth is M
2time SPWM waveform and the sine wave of equivalence, at this moment M
1< M
2.From diagram, the visible size regulating modulation depth can the numerical value of regulation output sine wave.
Fig. 4 is speed error E
smembership function
for speed error E
sfuzzy set and domain be defined as follows:
E
sfuzzy set be: { NB, NM, NS, ZO, PS, PM, PB};
E
sdomain be: {-150 ,-100 ,-80 ,-60 ,-40 ,-20,0,20,40,60,80,100,150};
According to speed error E
sfuzzy set and the membership function of domain determination fuzzy variable, determine the degree of membership of domain interior element to Fuzzy Linguistic Variable, obtain Fig. 4 medium speed error E
sdegree of membership.
Fig. 5 is speed error rate of change EC
smembership function
for speed error rate of change EC
sfuzzy set and domain be defined as follows:
EC
sfuzzy set be: { NB, NM, NS, ZO, PS, PM, PB};
EC
sdomain be: {-150 ,-90 ,-70 ,-50 ,-30 ,-10,0,10,30,50,70,90,150};
According to speed error rate of change EC
sfuzzy set and the membership function of domain determination fuzzy variable, determine the degree of membership of domain interior element to Fuzzy Linguistic Variable, obtain Fig. 5 medium speed error rate EC
sdegree of membership.
Fig. 6 is modulation depth COEFFICIENT K
mmembership function
for modulation depth COEFFICIENT K
mfuzzy set and domain be defined as follows:
K
mfuzzy set be: { NB, NM, NS, ZO, PS, PM, PB};
K
mdomain be: { 0.1,0.2,0.3,0.4,0.6,0.8,1.0,1.2,1.4,1.6,1.8,2.0,2.5};
According to modulation depth COEFFICIENT K
mfuzzy set and the membership function of domain determination fuzzy variable, determine the degree of membership of domain interior element to Fuzzy Linguistic Variable, obtain modulation depth K in Fig. 6
mdegree of membership.
Above-mentioned to speed error E
s, speed error rate of change EC
s, modulation depth COEFFICIENT K
mfuzzy set, domain and degree of membership definition be not optimal value, can rule of thumb adjust during practical application.According to above-mentioned setting, by the commissioning experience determination modulation depth COEFFICIENT K of reality
mcontrol rule table, as shown in table 1, the content inside control rule table also can the incompatible adjustment according to different applied field.
Table 1 modulation depth COEFFICIENT K
mcontrol rule table
。
According to table 1, modulation depth COEFFICIENT K
mvalue is exemplified below:
1) if speed error E
s> 150, then E
s=PB; Speed error rate of change EC
s> 150, then EC
s=PB; Table look-up to obtain K
m=NB, modulation depth COEFFICIENT K
mget 0.1.
2) if speed error E
s<-150, then E
s=NB; Speed error rate of change EC
s<-150, then EC
s=NB; Table look-up to obtain K
m=PB, modulation depth COEFFICIENT K
mget 2.5.
Prove to suppress the device and method of inverter output voltage transient wave obviously to suppress output voltage to be pulsed in invention by practical application, improve the mapping of inverter.
By reference to the accompanying drawings the specific embodiment of the present invention is described although above-mentioned; but not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various amendment or distortion that creative work can make still within protection scope of the present invention.
Claims (10)
1. suppress a device for inverter output voltage transient wave, it is characterized in that: comprise engine, permanent magnet generator, rectification change module, LC filter circuit and controller, wherein:
Engine connects permanent magnet generator, produces alternating current, and permanent magnet generator connects rectification change module, and rectification change module connects load by LC filter circuit, and controller drives rectification change module and LC filter circuit;
Described rectification change module, comprise rectification module, filter circuit and power conversion circuit, after alternating current is converted to direct current by rectification module, filter circuit carries out filtering to it, and filter circuit connects power conversion circuit;
Described controller is provided with PWM output module, A/D modular converter, described PWM output module connects power conversion circuit by drive circuit, obtain the output voltage of constant frequency and constant voltage, this voltage is powering load after LC filter circuit, and A/D modular converter receives AC supply voltage state, the filtered DC bus-bar voltage state of filter circuit of generator.
2. a kind of device suppressing inverter output voltage transient wave as claimed in claim 1, is characterized in that: described A/D modular converter connects current transformer by isolating amplifier circuit, and current transformer connects LC filter circuit rear end.
3. a kind of device suppressing inverter output voltage transient wave as claimed in claim 1, is characterized in that: described A/D modular converter connects voltage transformer by isolating amplifier circuit, and voltage transformer connects load input terminal.
4. a kind of device suppressing inverter output voltage transient wave as claimed in claim 1, is characterized in that: described filter circuit is connected with DC/DC converter, and DC/DC converter connects drive circuit.
5. a kind of device suppressing inverter output voltage transient wave as claimed in claim 1, is characterized in that: described controller is provided with power drive protection interrupt module, receives temperature protection signal, overcurrent protection signal and overvoltage protection signal.
6. a kind of device suppressing inverter output voltage transient wave as claimed in claim 5, is characterized in that: described controller is embedded controller or digital signal processor, electronic controller.
7. based on the control method of the system as described in any one of claim 1-6, it is characterized in that: comprise the following steps:
(1) voltage effective value of the ac power frequency and self outlet side that external sampling circuit are obtained input side generator is converted to corresponding digital quantity input control device;
(2) controller forms speed error and voltage error according to setting speed reference value and actual speed sampled value by mathematical operation, and the membership function of definition speed error and speed error rate of change membership function, build fuzzy logic ordination table;
(3) change according to the mode of prefabricated fuzzy logic ordination table the transient wave that the modulation depth producing sinusoidal pulse width modulation reduces output voltage in real time.
8. control method as claimed in claim 7, is characterized in that: in described step (2), for speed error E
sfuzzy set and domain be defined as follows:
E
sfuzzy set be: { NB, NM, NS, ZO, PS, PM, PB};
E
sdomain be: {-150 ,-100 ,-80 ,-60 ,-40 ,-20,0,20,40,60,80,100,150};
According to speed error E
sfuzzy set and the membership function of domain determination fuzzy variable, determine the degree of membership of domain interior element to Fuzzy Linguistic Variable, obtain speed error E
sdegree of membership;
In described step (2), for speed error rate of change EC
sfuzzy set and domain be defined as follows:
EC
sfuzzy set be: { NB, NM, NS, ZO, PS, PM, PB};
EC
sdomain be: {-150 ,-90 ,-70 ,-50 ,-30 ,-10,0,10,30,50,70,90,150};
According to speed error rate of change EC
sfuzzy set and the membership function of domain determination fuzzy variable, determine the degree of membership of domain interior element to Fuzzy Linguistic Variable, obtain speed error rate of change EC
sdegree of membership.
9. control method as claimed in claim 7, is characterized in that: in described step (2), for modulation depth COEFFICIENT K
mfuzzy set and domain be defined as follows:
K
mfuzzy set be: { NB, NM, NS, ZO, PS, PM, PB};
K
mdomain be: { 0.1,0.2,0.3,0.4,0.6,0.8,1.0,1.2,1.4,1.6,1.8,2.0,2.5};
According to modulation depth COEFFICIENT K
mfuzzy set and the membership function of domain determination fuzzy variable, determine the degree of membership of domain interior element to Fuzzy Linguistic Variable, obtain modulation depth K
mdegree of membership.
10. control method as claimed in claim 7, is characterized in that: in described step (2), to speed error E
s, speed error rate of change EC
s, modulation depth COEFFICIENT K
mfuzzy set, domain and degree of membership definition rule of thumb adjust; According to setting, by the commissioning experience determination modulation depth COEFFICIENT K of reality
mcontrol rule table;
In described step (2), K
mcontrol rule table be:
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| CN113489388A (en) * | 2021-06-21 | 2021-10-08 | 山东省科学院自动化研究所 | Direct instantaneous current control method and controller for switched reluctance motor |
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| Publication number | Publication date |
|---|---|
| CN104506049B (en) | 2017-02-22 |
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