CN101577518B - Speed regulating system of high power factor load current-change synchronous motor - Google Patents
Speed regulating system of high power factor load current-change synchronous motor Download PDFInfo
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- CN101577518B CN101577518B CN2009100872447A CN200910087244A CN101577518B CN 101577518 B CN101577518 B CN 101577518B CN 2009100872447 A CN2009100872447 A CN 2009100872447A CN 200910087244 A CN200910087244 A CN 200910087244A CN 101577518 B CN101577518 B CN 101577518B
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Abstract
A speed regulating system of a high power factor load current-change synchronous motor belongs to the technical filed of power and electron and comprises an alternating-current side LC filter, a PWM type rectification circuit directly connected in series with a full-control type power electronic device, a direct-current side filter reactor and an inverter circuit directly connected in series withal polycrystalline gate tube with 6 pulses, wherein a three-phrase input power supply is connected to the input upper end of the three-phrase PWM type rectification circuit formed by the full-control type power electronic device through the alternating-current side LC filter formed by a three-phrase inductor and a three-phrase capacitor; the PWM type rectification circuit rectifies an alternating-current power supply into a direct-current power supply with changeable amplitude values by changing trigger pulses of the full-control type power electronic device according to the computing result of a control system; and the inverter circuit controls the frequency and amplitude values of the stator current of the synchronous motor to output the frequency and the amplitude values to a stator of the synchronous motor by changing trigger pulses of a thyristor to modulate the direct current according to the computing result of the control system. The invention has the advantages that current at grid side is sine wave, and the power factor of unit power at grid side is adjustable and can approach to 1.
Description
Technical field
The invention belongs to electric and electronic technical field, a kind of speed regulating system of high power factor load current-change synchronous motor particularly is provided, this system can be used in the high-power synchronous machine frequency control drive system.
Background technology
At high-power industrial circle, synchronous motor is used widely owing to its high efficiency and high reliability always.Synchronous machine is carried out frequency control can save energy and reduce the cost significantly, brings huge economic benefit.In the high-power particularly super high power occasion of (surpassing 100MW), generally all adopt load current-change formula inverter (Load-CommutatedInverter is called for short LCI) at present.LCI is made up of three parts: rectifier, DC filtering reactor and inverter.Rectifier is general, and to adopt 6 common pulse scr rectification circuit structures, effect be that alternating current with fixed voltage and fixed frequency converts direct current to, and to control its electric current be constant current.Inverter also adopts pulse thyristor bridge circuit structure, and effect is to convert direct current to voltage and all adjustable alternating current of frequency, supplies with synchronous motor, and the rate of change of its electric current depends on the motor inductance.The advantage of LCI is that circuit system is simple, and cost economy is convenient to realize regenerative braking and four quadrant running, and current limiting capacity is strong, short-circuit protection reliability height.But the major defect of LCI is because its rectifier adopts 6 common pulse scr rectification circuit structures usually, contain very high harmonic component in this rectification circuit input current, 5 subharmonic of input current can reach 20%, 7 subharmonic can reach 12%, also contain the high order harmonic component of the quick commutation generation of thyristor simultaneously, total harmonic current distortions is about 30%; And at scr rectification circuit, the voltage of intermediate dc link is proportional to the power factor that the motor lines voltage rating multiply by operating point motor reality, multiply by rotating speed percentage again.So, for square torque load(ing)s such as blower fan water pumps, dc tache voltage can the very fast reduction along with the decline of rotating speed, so input rectification circuit must will move after the trigger angle, cause the very fast decline of input power factor like this, therefore in general, the LCI input power factor is lower, and can reduce along with the decline of motor speed.
Summary of the invention
The object of the present invention is to provide a kind of speed regulating system of high power factor load current-change synchronous motor, realized that current on line side is sinusoidal wave; Net side unit power power factor is adjustable, can accomplish to approach 1; And has dynamic control performance faster.
The present invention includes AC side LC filter, the PWM type rectification circuit that all-controlling power electronics device is directly connected, the filter reactor of DC side and the direct series resonant inverter circuit of 6 pulse polycrystalline brake tubes; Three-phase input power supply is received on the input of the PWM type rectification circuit that three-phase is made up of all-controlling power electronics device by the AC side LC filter of being made of three pole reactor electric capacity, PWM type rectification circuit is according to the result of calculation of control system, by changing the trigger impulse of all-controlling power electronics device, AC power is rectified into the DC power supply of variable amplitude, the output that is PWM type rectification circuit is the DC power supply of variable amplitude, after the filter reactor of this DC power supply process DC side carries out level and smooth and filtering, input as 6 pulse polycrystalline brake tube series resonant inverter circuit, inverter circuit is according to the result of calculation of control system, by the trigger impulse that changes thyristor this direct current is modulated, the frequency and the amplitude of control synchronous motor stator electric current are exported to synchronous motor stator.
The PWM type rectification circuit of all-controlling power electronics device of the present invention is (to determine the number of series connection device according to the product power grade by many, being generally 3～10) full-control type has the three-phase thyristor bridge circuit that the inverse-impedance type power electronic device of forward and reverse voltage blocking ability directly is composed in series, be used to control the DC side electric current, i.e. the amplitude of synchronous motor stator electric current; Control net side power factor simultaneously, realize that current on line side is sinusoidal wave; Net side unit power power factor is adjustable, accomplishes to approach 1.
The major function of AC side LC filter is to leach the high order current harmonics, improves the power electronic device commutation process; The major function of the PWM type rectification circuit of all-controlling power electronics device is control DC side electric current, the i.e. amplitude of synchronous motor stator electric current and net side power factor; The filter reactor of DC side is that the DC side electric current is carried out level and smooth and filtering, makes for the similar current source of inverter circuit front end; The major function of 6 pulse polycrystalline brake tube series resonant inverter circuit is frequency and phase places of control synchronous motor stator electric current.
Beneficial effect of the present invention:
I compares with traditional LC, and the present invention adopts the PWM type rectification circuit of all-controlling power electronics device to replace original 6 pulse scr rectification circuit structures, thereby can realize that current on line side is sinusoidal wave; Net side unit power power factor is adjustable, can accomplish to approach 1; And has dynamic control performance faster.
Description of drawings
Fig. 1 is the topological structure of speed regulating system of high power factor load current-change synchronous motor of the present invention
Fig. 2 is the whole control method of speed regulating system of high power factor load current-change synchronous motor of the present invention
Embodiment
Below in conjunction with accompanying drawing technical scheme of the present invention is described further:
Fig. 1 is main circuit topological structure figure of the present invention.As shown in the figure, three-phase alternating current electrical network U
AU
BU
C, through reactor L
RAL
RBL
RCWith capacitor C
RAC
RBC
RCThe LC filter of forming inserts rectified three-phase circuit, and rectified three-phase circuit is had the inverse-impedance type power electronic device cell S of forward and reverse voltage blocking ability by 6 full-control types
1S
6Be formed by connecting with the three-phase thyristor bridge circuit form, each unit all directly is in series by many power electronic device, after the filter reactor of the direct current process DC side of rectification circuit output carries out level and smooth and filtering, as the input of inverter circuit, inverter circuit is a three-phase thyristor bridge-type current transformer, and 6 brachium pontis are arranged, each brachium pontis is made of the thyristor element connected in series, inverter is reverse into changeable frequency with DC power supply, the alternating current of voltage variable, and export to synchronous motor stator.
Fig. 2 is a whole control block diagram of the present invention.This control method is the set-point that obtains dc bus current by the control of inversion side, and the control by the rectification side guarantees the requirement of DC side current following load change then, guarantees that simultaneously net side power factor is controlled, and approaches 1.
Synchronous machine velocity setting value ω
*Compare with value of feedback ω and to do the speed closed-loop control, speed regulator is output as the direct current set-point
Send into the rectification circuit controller, the rectification circuit controller is made up of DC side Current Control link and two controlling units of power factor controlling link, in DC side Current Control link, and input dc power stream set-point and direct current value of feedback i
d, the direct axis component m of output modulating function
d, directly control direct current i
dSize; In the power factor controlling link, sampling line voltage synchronizing signal U
Sa, sb, scWith net side three-phase current i
Sa, sb, scActual value, calculate link by the current on line side idle component and obtain current on line side idle component i
Sr, i
SrWith input dc power stream feedforward i
dBe input in the power factor controlling link, by calculating the quadrature axis component m of modulating function
q, m
d, m
qComprehensive electric network voltage phase angle θ
s, obtain the α beta-axis component m of modulating function
α, m
β, obtain 6 road pwm control signals by the SVM modulation technique at last, control inverse-impedance type power electronic device cell S
1S
6Switch motion.
The frequency of synchronous motor stator electric current and phase place are controlled by the thyristor inverter controller.Circuit control device is according to the given γ of change of current advance angle
0 *, by calculating the trigger impulse that produces thyristor inverter.The leading unloaded induced potential of synchronous motor stator current makes the reliable change of current of thyristor inverter.
The control of synchronous machine exciting curent is independently, and the exciting curent adjuster carries out closed-loop control to exciting curent, makes exciting curent that set-point is installed and changes.
Claims (2)
1. speed regulating system of high power factor load current-change synchronous motor, it is characterized in that, comprise AC side LC filter, the PWM type rectification circuit that all-controlling power electronics device is directly connected, the filter reactor of DC side and the direct series resonant inverter circuit of 6 pulse polycrystalline brake tubes; Three-phase input power supply is received on the input of the PWM type rectification circuit that three-phase is made up of all-controlling power electronics device by the AC side LC filter of being made of three pole reactor electric capacity, PWM type rectification circuit is according to the result of calculation of control system, by changing the trigger impulse of all-controlling power electronics device, AC power is rectified into the direct current of variable amplitude, the output that is PWM type rectification circuit is the direct current of variable amplitude, after the filter reactor of this direct current process DC side carries out level and smooth and filtering, input as 6 pulse polycrystalline brake tube series resonant inverter circuit, inverter circuit is according to the result of calculation of control system, by the trigger impulse that changes thyristor this direct current is modulated, the frequency and the amplitude of control synchronous motor stator electric current are exported to synchronous motor stator.
2. speed regulating system of high power factor load current-change synchronous motor according to claim 1, it is characterized in that, the PWM type rectification circuit of all-controlling power electronics device is to have the three-phase thyristor bridge circuit that the inverse-impedance type power electronic device of forward and reverse voltage blocking ability directly is composed in series by 3～10 full-control types, be used to control the DC side electric current, the amplitude of synchronous motor stator electric current; Control net side power factor simultaneously, realize that current on line side is sinusoidal wave; Net side unit power power factor is adjustable, accomplishes to approach 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100872447A CN101577518B (en) | 2009-06-19 | 2009-06-19 | Speed regulating system of high power factor load current-change synchronous motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100872447A CN101577518B (en) | 2009-06-19 | 2009-06-19 | Speed regulating system of high power factor load current-change synchronous motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101577518A CN101577518A (en) | 2009-11-11 |
| CN101577518B true CN101577518B (en) | 2011-08-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009100872447A Expired - Fee Related CN101577518B (en) | 2009-06-19 | 2009-06-19 | Speed regulating system of high power factor load current-change synchronous motor |
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| CN (1) | CN101577518B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108233794B (en) * | 2018-01-04 | 2020-09-11 | 兰天驰 | Quick stopping method for load conversion inverter driving electro-magnetic synchronous motor |
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2009
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