JP3257376B2 - PWM control self-excited rectifier - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-excited rectifier for converting AC power of a commercial power supply into DC power by a self-excited rectifier and supplying power to a load.

[0002]

2. Description of the Related Art FIG. 6 is a block diagram showing a conventional example of this type of PWM control self-excited rectifier. 6, reference numeral 1 denotes a commercial power supply, 2 denotes an input filter including an AC reactor and a capacitor, 10 denotes a PWM control self-excited rectifier, and 3 denotes a load such as an inverter connected to an output of the PWM control self-excited rectifier 10. .

The PWM control self-excited rectifier 10 is an IGB
The main circuit 1 of a self-excited rectifier in which a self-extinguishing type semiconductor element such as T and a diode are connected in anti-parallel and connected in bridge
1, an AC reactor 12 of a self-excited rectifier, a capacitor 13 for smoothing the output of the self-excited rectifier, a phase voltage detector 14 for detecting a phase voltage of the commercial power supply 1, and insulatingly converting an R-phase phase voltage of the commercial power supply 1. An insulation converter 15; an angle signal generator 16 for generating an angle signal (θ, θ = 0 ° to 360 °) synchronized with the phase of the R-phase voltage of the commercial power supply 1 via the insulation converter 15; A sine wave generator 17 for generating a sine wave based on the signal (θ), and a sine wave generator ₁ for generating a sine wave based on a value (θ ₁ ) obtained by adding 120 ° to the angle signal
8. A voltage regulator 21 that performs a voltage regulation operation based on a deviation between a voltage set value of the voltage setter 19 and a voltage detection value obtained by detecting a voltage between both ends of the capacitor 13 via the insulation converter 20, and an output of the voltage regulator 21. A multiplier 23 multiplies an R-phase current set value (i _R ^* ) obtained by multiplying the output of the sine wave generator 17 by the multiplier 22 with the output of the voltage regulator 21 and the output of the sine wave generator 18. T-phase current set value (i _T ^* ) obtained by multiplication
, The S-phase current set value (i _S ^* ) is obtained, and this i _R ^* ,
Deviations between i _S ^* , i _T ^* and R-phase current detection value (i _R ), S-phase current detection value (i _S ), and T-phase current setting value (i _T ) obtained by current detector 24. To the current regulators 25 and 2
The adjustment operation is performed at 6, 27, and the current controllers 25, 26, 27
From each output, the carrier signal generator 28 and the comparator 2
9 to perform PWM control, and apply a gate signal from the output of the comparator 29 to each self-extinguishing type semiconductor element of the main circuit 11 of the self-excited rectifier by the gate drive circuit 30.

The above-described PWM control self-excited rectifier 10 uses a well-known technique, and a detailed description of the operation will be omitted.

[0005]

The conventional P shown in FIG.
In the WM control self-excited rectifier, the input filter 2 and P
When installing the WM control self-excited rectifier 10 on a switchboard and performing wiring work between them, a large current flows through the wiring cable A and the wiring cable B, so a wiring cable having a large wire diameter is required. In many cases, wiring work is performed together with other devices of the switchboard. At this time, incorrect wiring occurs in the connection between the wiring cable A and the wiring cable B. As a result, the PWM control self-excited rectifier 10 operates normally. There was no fear. Note that the wiring cable C has only a signal current, and therefore, it is easy to avoid the above-described problem by using a wiring cable with a connector manufactured in advance.

SUMMARY OF THE INVENTION An object of the present invention is to solve the problem caused by incorrect wiring between the wiring cable A and the wiring cable B.
An object of the present invention is to provide a control self-excited rectifier.

[0007]

According to a first aspect of the present invention, there is provided a self-excited rectifier for converting AC power of a commercial power supply into DC power by a self-excited rectifier and supplying power to a load. , And a voltage adjustment operation is performed so that the DC voltage becomes a predetermined value. The current command value (DC amount) obtained by the voltage adjustment operation is synchronized with the phase of the commercial power supply. Each phase current command value (AC amount) is calculated based on the angle signal, the phase current of the commercial power supply is detected so as to follow the phase current command value, and the current adjustment calculation is performed. A PWM control self-excited rectifier for generating each phase gate signal subjected to PWM control based on an output obtained by performing a current adjustment operation and a carrier signal, and controlling the self-extinguishing type semiconductor device of the self-excited rectifier using each phase gate signal. In the above, AC between the self-commutated rectifier
Angle data generating means for connecting an input filter composed of a reactor and a capacitor, and generating angle data synchronized with the phase voltage of any one phase of the commercial power supply;
Phase sequence detecting means for outputting a phase sequence signal from any two phase voltages on the input side of the self-excited rectifier; and a phase of any one of the angle data and the phase voltage used for phase sequence detection the angle signal in synchronization with the phase voltage of the input side of said self-commutated rectifier by the phase difference detecting means for outputting a phase difference correction value, and the angle data and the phase difference correction value by a, the angle
The angle signal reflects the phase sequence based on the phase sequence signal.
Angle signal conversion means for converting the added signal .

[0008] A second aspect of the present invention is an AC power supply for a commercial power supply.
Is converted to DC power by a self-excited rectifier and supplied to the load.
Self-excited rectifier, wherein the output of the self-excited rectifier is
DC voltage is detected, and this DC voltage becomes a predetermined value.
Voltage adjustment calculation, and the voltage adjustment calculation
Synchronized with the current command value (DC amount) and the phase of the commercial power supply
Calculates the current command value (AC amount) for each phase based on the angle signal
The commercial power supply is controlled so as to follow these phase current command values.
The current of each phase is detected and the current is adjusted and calculated.
PW is calculated based on the output of the current adjustment operation and the carrier signal.
Generates a gate signal for each phase controlled by M,
The self-extinguishing rectifier self-extinguishing semiconductor device is
In the PWM control self-excited rectifier to be controlled, an input filter including an AC reactor and a capacitor is connected between the commercial power supply and the self-excited rectifier, and the phase is synchronized with the phase voltage of any one phase of the commercial power supply. Angle data generating means for generating the obtained angle data, phase sequence detecting means for outputting a phase sequence signal from any two line voltages on the input side of the self-excited rectifier, and used for the angle data and phase sequence detection . Phase difference detecting means for outputting a phase difference correction value based on the phase of any one of the line voltages, and synchronizing with the phase voltage on the input side of the self-excited rectifier based on the angle data and the phase difference correction value Angle signal, and the phase sequence signal
And an angle signal converting means for outputting a signal obtained by adding an angle reflecting the phase sequence based on the signal .

According to the first or second aspect of the present invention, there is provided a circuit for confirming a phase difference and a phase sequence between the power supply side of the input filter and the input side of the self-excited rectifier, and the angle signal is generated by this circuit. Thus, an operation corresponding to any connection of the distribution cables A or B is performed.

[0010]

FIG. 1 is a block diagram of a PWM control self-excited rectifier according to a first embodiment of the present invention, in which components having the same functions as those of the prior art shown in FIG. Is attached. In FIG. 1, the PWM control self-excited rectifiers 40 and 50 have angle data (θ _R0 , θ _R0) synchronized with the phase of the first phase voltage on the commercial power supply 1 side of the input filter 2 via the insulation converter 15. = 0 ° to 360 °), a phase sequence detecting unit for outputting a phase sequence signal from any two phase voltages on the input side of the PWM control self-excited rectifiers 40 and 50, and the angle Phase difference detection means for outputting a phase difference correction value based on the data and the phase of one of the two phase voltages input to the phase sequence detection means, and PWM based on the angle data and the phase difference correction value
An angle signal calculator 42 or 51 comprising angle signal conversion means for generating an angle signal synchronized with the phase voltage on the input side of the control self-excited rectifiers 40 and 50 is provided.

FIG. 2 is a block diagram of a PWM control self-excited rectifier according to a second embodiment of the present invention. The difference from FIG. 1 is that the wiring cables A and B in FIG.
The distribution cables D and E are connected as shown in FIG.

[0012]

FIG. 3 is a detailed circuit diagram of the angle calculation unit 42 according to the first embodiment of the present invention, showing the case of the wiring cables D and E shown in FIG. In FIG. 3, a PWM control self-excited rectifier 40
Phase detection means 43 comprising a photocoupler, an inverter element, a D-type flip-flop, etc., for detecting the phase voltages of the first and third phases of the input, and detecting the phase sequence, and the phase voltage of the first phase Data latch element 44 as phase difference detecting means for reading and latching the angle data (θ _R0 ) at the time of the change in the polarity of the data, and calculating the angle signal (θ) from the angle data (θ _R0 ) and the output of the data latch element 44 Then, based on the output of the phase sequence detecting means 43, + 120 ° is added to the angle signal (θ) if the phase sequence is normal, and -120 ° is added to the angle signal (θ) if the phase sequence is reverse. Angle signal (θ ₁ )
Is output from the angle signal converter 45.

The operation of the angle calculator 42 in FIG. 3 will be described below with reference to the operation waveform diagram shown in FIG. FIG.
4A shows the phase voltage waveforms of the R, S, and T phases of the commercial power supply 1, and FIG. 4B shows the PWM from the commercial power supply 1 via the wiring cable D, the input filter 2, and the wiring cable E.
FIG. 4C shows a phase signal (C _R ) obtained from the first phase voltage of the input of the control self-excited rectifier 40. Similarly, FIG. 4C shows a phase signal (C _R ) obtained from the third phase voltage. C _T ), and a phase sequence signal (FIG. 4D) is obtained from C _R and C _T , indicating that the phase sequence is in the reverse direction.

[0014] The angle data phase difference 240 ° is obtained by the data latch element 44 from the rising of the (theta _R0, 4 (e)) and the phase signal (C _R), each time from the angle data (theta _R0) The phase difference 240 ° is subtracted to calculate and output an angle signal (θ, FIG. 4 (F)), and the angle signal (θ) is changed to 120 ° each time by the polarity of the phase sequence signal.
Is reduced to calculate and output the angle signal (θ ₁ , FIG. 4 (G)).

FIG. 5 is a detailed circuit configuration diagram of the angle calculation unit 51 according to the second embodiment of the present invention, showing the case of the distribution cables A and B shown in FIG. In FIG. 5, the angle calculation unit 51 includes a PWM control self-excited rectifier 40.
Sequence detecting means comprising a photocoupler, an inverter element, a D-type flip-flop, etc. for detecting the phase sequence from the line voltage between the first and second phases and the line voltage between the third and second phases. 52, a data latch element 44 as phase difference detecting means for reading and latching the angle data (θ _R0 ) when the polarity of the line voltage between the first and second phases changes, the angle data (θ _R0 ) and the data latch The angle signal (θ) is obtained from the output of the element 44 and the phase difference (−30 °) between the line voltage and the phase voltage.
And + 120 ° is added to the angle signal (θ) based on the output of the phase sequence detecting means 52 if the phase sequence is normal, and -120 ° is added if the phase sequence is reverse. Signal converting means 53 for outputting an angle signal (θ ₁ )
It is composed of

The operation of the angle calculation unit 51 of FIG. 5 is the same as that of the angle calculation unit 42 of FIG. 3 except that the circuit configuration takes into account the phase difference between the line voltage of the commercial power supply 1 and the phase voltage. is there. The present invention provides an angle data generating means for generating angle data synchronized with the phase of any one phase of the commercial power supply 1, and any two phase voltages or lines on the input side of the self-excited rectifier. By setting each constant value of the angle signal converting means by the phase sequence detecting means for outputting the phase sequence signal from the inter-voltage and the combination thereof, the intended operation can be performed.

[0017]

According to the present invention, the input filter and the PW
When the customer installs the M-control self-excited rectifier and the power supply and the wiring work between them with the switchboard installed, if the wire diameter of the wiring cable is correctly selected, it can operate normally regardless of the connection order. PWM control self-excited rectifier can be provided, and it is most suitable as a DC power supply such as an inverter.
It is also possible to make the power factor of the WM control self-excited rectifier approximately “1.0”.

[Brief description of the drawings]

FIG. 1 is a block diagram of a PWM control self-excited rectifier showing a first embodiment of the present invention.

FIG. 2 is a block diagram of a PWM control self-excited rectifier showing a second embodiment of the present invention.

FIG. 3 is a circuit diagram showing a first embodiment of the present invention.

FIG. 4 is a waveform chart for explaining the operation of FIG. 3;

FIG. 5 is a circuit diagram showing a second embodiment of the present invention.

FIG. 6 is a block diagram of a PWM control self-excited rectifier showing a conventional example.

[Explanation of symbols]

1: commercial power supply, 2: input filter, 3: load, 10, 4
0, 50: PWM control self-excited rectifier, 11: Main circuit of self-excited rectifier, 12: AC reactor, 13: Capacitor, 14: Phase voltage detector, 15, 20: Isolation converter, 1
6 ... Angle signal generating means, 17, 18 ... Sine wave generator, 1
9: voltage setting device, 21: voltage regulator, 22, 23: multiplier, 24: current detector, 25 to 27: current regulator, 28
... Carrier signal generator, 29 ... Comparator, 30 ... Gate drive circuit, 41 ... Angle data generation means, 42,51 ... Angle signal calculation unit, 43,52 ... Phase sequence detection means, 44 ... Data latch element, 45, 53 ... Angle signal conversion means, A, B,
C, D, E: wiring cable, θ, θ ₁ ... angle signal.

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H02M 7/219 G01R 25/00

Claims (2)

(57) [Claims] 1. A self-excited rectifier for converting AC power of a commercial power supply into DC power by a self-excited rectifier and supplying power to a load, wherein the DC voltage of the output of the self-excited rectifier is detected, and the DC voltage is detected. A voltage adjustment operation is performed so as to have a predetermined value, and a current command value (DC amount) obtained by the voltage adjustment operation and an angle signal synchronized with the phase of the commercial power supply are used for each phase current command value (AC Amount), the phase current of the commercial power supply is detected so as to follow the phase current command value, and a current adjustment operation is performed. The output of the current adjustment operation of each phase and the carrier signal are used. A PWM controlled self-excited rectifier that generates a PWM-controlled gate signal for each phase and controls the self-extinguishing type semiconductor device of the self-excited rectifier by using the phase gate signal. AC rear in between An angle data generating means for connecting an input filter consisting of a torquer and a capacitor, and generating angle data synchronized with the phase voltage of any one phase of the commercial power supply; A phase sequence detecting means for outputting a phase sequence signal from the phase voltages of the three phases; and one of the angle data and the phase voltage used for phase sequence detection
One of the phase voltage of the phase and the phase difference detecting means for outputting a phase difference correction value by the angle signal synchronized with the angle data and the phase voltage of the input side of the phase difference correction value and by the self-commutated rectifier, the angle signal
The angle reflecting the phase sequence based on the phase sequence signal
A PWM signal self-excited rectifier, comprising: an angle signal converter that outputs a converted signal. 2. A self-excited rectifier for converting AC power of a commercial power supply into DC power by a self-excited rectifier and supplying power to a load, wherein a DC voltage at an output of the self-excited rectifier is detected, and the DC voltage is detected. A voltage adjustment operation is performed so as to have a predetermined value, and a current command value (DC amount) obtained by the voltage adjustment operation and an angle signal synchronized with the phase of the commercial power supply are used for each phase current command value (AC Amount), the phase current of the commercial power supply is detected so as to follow the phase current command value, and a current adjustment operation is performed. The output of the current adjustment operation of each phase and the carrier signal are used. A PWM controlled self-excited rectifier that generates a PWM-controlled gate signal for each phase and controls the self-extinguishing type semiconductor device of the self-excited rectifier by using the phase gate signal. AC rear in between An angle data generating means for connecting an input filter consisting of a torquer and a capacitor, and generating angle data synchronized with the phase voltage of any one phase of the commercial power supply; A phase sequence detecting means for outputting a phase sequence signal from the two line voltages, and a phase difference correction value based on the angle data and the phase of any one of the line voltages used for phase sequence detection. a phase difference detecting means, and the angle signal synchronized with the angle data and the phase voltage of the input side of the phase difference correction value and by the self-commutated rectifier, the angle signal
The angle reflecting the phase sequence based on the phase sequence signal
A PWM signal self-excited rectifier, comprising: an angle signal converter that outputs a converted signal.