JP3195179B2 - Single-phase PWM converter controller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention converts a single-phase AC voltage to a DC voltage, and performs pulse width modulation control by comparing a modulation triangular wave from a triangular wave generating means with a carrier sine wave. The present invention relates to a phase PWM converter control device.

[0002]

2. Description of the Related Art Conventionally, in a single-phase PWM converter control device, the modulation frequency of pulse width modulation has been constant. This is because the triangular wave generating means 2 for pulse width modulation is constituted by a constant frequency triangular wave generating section 29 as shown in FIG.

[0003]

However, in order to reduce the switching loss of the PWM converter, improve the efficiency and reduce the size of the heat radiating device while keeping the modulation frequency of the pulse width modulation constant, the modulation of the PWM converter is required. It is effective to set the frequency to be low, but if the switching frequency is set to be low, the ripple of the converter AC side current increases and exceeds the maximum cutoff current of the switching element (GTO: gate turn-off thyristor, etc.) of the PWM converter. For this reason, it is necessary to add a current smoothing reactor or the like, which has led to an increase in the size of the apparatus.

An object of the present invention is to provide a single-phase PWM converter control device capable of reducing the switching loss of a PWM converter without adding a current smoothing reactor or the like.

[0005]

SUMMARY OF THE INVENTION The present invention is configured as follows to solve the above problems.
That is, an invention corresponding to claim 1 is a single-phase PWM converter control device that converts AC power to DC power by switching a switching element in a main circuit of a single-phase converter by a PWM control signal. And a phase calculating means for calculating and outputting a sine wave phase of the AC power supply voltage, and inputting the sine wave phase of the AC power supply voltage, and according to the AC power supply voltage sine wave phase, 1 / 6π to 5/5 of the AC power supply voltage. in large areas of the amplitude such as 6π select high-frequency triangular wave, except in regions of large amplitude the AC power supply voltage selecting low-frequency triangular wave, said etc.
A triangular wave frequency setting unit that outputs a triangular wave frequency setting signal indicating whether or not a triangular wave frequency is selected, and receives the sine wave phase of the AC power supply voltage and outputs a high-frequency triangular wave synchronized with the sine wave phase of the AC power supply voltage. A high frequency triangular wave generator, and the AC power supply voltage sine wave phase as input,
A low-frequency triangular wave generator that outputs a low-frequency triangular wave synchronized with the AC power supply voltage sine wave phase; and a high-frequency triangular wave generator that outputs a triangular wave frequency setting signal that is output from the triangular wave frequency setting unit. A triangular wave generating unit including a frequency triangular wave or a triangular wave switching unit that outputs a low frequency triangular wave output from the low frequency triangular wave generating unit, the AC power supply voltage sine wave phase, the AC power supply voltage, and a converter AC. Side current, a DC voltage command value, and a converter voltage command calculating means for calculating and outputting a converter voltage command with the DC voltage as an input; a triangular wave output from the triangular wave generating means; and a triangular wave output from the converter voltage command calculating means. Triangular wave comparing means for calculating and outputting the PWM control signal with a converter voltage command as input. Phase is a PWM converter control device.

According to a second aspect of the present invention, each of the switching elements in a main circuit of a plurality of single-phase converters connected in parallel is switched by a PWM control signal, thereby converting AC power into DC power. In a single-phase PWM converter control device for converting to power, a phase calculating means for inputting an AC power supply voltage and calculating and outputting a sine wave phase of the AC power supply voltage; According to the wave phase, a high-frequency triangular wave is selected in a region having a large amplitude such as 1 / 6π to 5 / 6π of the AC power supply voltage, and a triangular wave for selecting a low-frequency triangular wave in a region other than the region having a large amplitude of the AC power supply voltage. A plurality of triangular wave frequency setting units for outputting a frequency setting signal, and the AC power supply voltage sine wave phase being input, the AC power supply voltage sine wave A plurality of high-frequency triangular wave generators that output high-frequency triangular waves that are out of phase so that the high-frequency triangular waves of a plurality of single-phase PWM converters that are synchronized with the phase and connected in parallel have a phase difference; The sine wave phase of the AC power supply voltage is input, and the phases are shifted so that the low frequency triangular waves of a plurality of single-phase PWM converters connected in parallel are synchronized with the sine wave phase of the AC power supply voltage and have a phase difference. A plurality of low-frequency triangular wave generators that generate low-frequency triangular waves, and each high-frequency triangular wave output from each high-frequency triangular wave generator corresponding to each triangular wave frequency setting signal output from each triangular wave frequency setting unit; Or a triangular wave generating means comprising a plurality of triangular wave switching units for outputting each low frequency triangular wave output from each of the low frequency triangular wave generating units; A converter voltage command calculating means for calculating and outputting a converter voltage command by inputting a phase, the AC power supply voltage, a converter AC side current, a DC voltage command value, and a DC voltage; and a triangular wave output from the triangular wave generating means A single-phase PWM converter control device comprising: a converter voltage command output from the converter voltage command calculation means; and a triangular wave comparison means for calculating and outputting the PWM control signal.

Further, according to a third aspect of the present invention, there is provided a single-phase PWM converter control device for converting AC power to DC power by switching a switching element in a main circuit of a single-phase converter by a PWM control signal. A phase calculating means for inputting an AC power supply voltage to calculate and output a sine wave phase of the AC power supply voltage, and a triangular wave storage unit, wherein the AC power supply voltage sine wave phase is input, A high-frequency triangular wave is output in synchronization with the AC power supply voltage in a region where the amplitude of the AC power supply voltage is large , such as 1 / 6π to 5 / 6π, calculated and stored in advance according to the voltage sine wave phase. A triangular wave generating means for outputting a low-frequency triangular wave in synchronization with the AC power supply voltage in a region other than a region where the amplitude of the AC power supply voltage is large; A converter voltage command calculation means for calculating and outputting a converter voltage command with the sine wave phase of the AC power supply voltage, the AC power supply voltage, the converter AC side current, the DC voltage command value, and the DC voltage as inputs, and the triangular wave generating means A single-phase PWM converter control device comprising: a triangular wave output from a converter; and a triangular wave comparing means for calculating and outputting the PWM control signal with a converter voltage command output from the converter voltage command calculating means as an input.

According to a fourth aspect of the present invention, there is provided a single-phase PWM converter control device for converting AC power to DC power by switching a switching element in a main circuit of a single-phase converter by a PWM control signal. A phase calculating means for inputting an AC power supply voltage and calculating and outputting a sine wave phase of the AC power supply voltage, and a triangular frequency setting switch which receives an AC-side current command value of the converter as an input and sets the converter AC-side current command value in advance. When the value is smaller than the value, a high-frequency triangular wave is selected. When the converter AC-side current command value is larger than a preset triangular frequency setting switching value, a triangular wave frequency for outputting a triangular wave frequency setting signal for selecting a low-frequency triangular wave. A setting unit, which receives the AC power supply voltage sine wave phase as an input and outputs a high frequency synchronized with the AC power supply voltage sine wave phase; A high-frequency triangular wave generator that outputs several triangular waves, a low-frequency triangular wave generator that receives the sine wave phase of the AC power supply voltage and outputs a low-frequency triangular wave synchronized with the sine wave phase of the AC power supply voltage, and the triangular wave frequency setting A high-frequency triangular wave output from the high-frequency triangular wave generator corresponding to the triangular-wave frequency setting signal output from the unit, or a triangular wave switching unit that outputs a low-frequency triangular wave output from the low-frequency triangular wave generator. A triangular wave generating means, a sine wave phase of the AC power supply voltage, the AC power supply voltage, a converter AC side current, a DC voltage command value, and a DC voltage as input, the converter voltage command and the converter AC side current command value. A converter voltage command calculating means for calculating and outputting the triangular wave output from the triangular wave generating means; The PW converter voltage command output from the command operation unit as an input
This is a single-phase PWM converter control device including triangular wave comparing means for calculating and outputting an M control signal.

Further, the invention corresponding to claim 5 is a single-phase PWM converter control device for converting AC power to DC power by switching a switching element in a main circuit of a single-phase converter by a PWM control signal. AC power supply voltage sine wave phase input, triangular wave generating means for outputting a triangular wave of a constant frequency synchronized with the AC power supply voltage sine wave phase, the AC power supply voltage sine wave phase, the AC power supply voltage, and the converter AC side A converter voltage command calculating means for calculating and outputting a converter voltage command value by inputting a current, a DC voltage command value, and a DC voltage; a converter voltage command value calculated by the converter voltage command calculating means; and the AC power supply voltage And a sine wave phase, and input a voltage other than 1 / 6π to 5 / 6π of the AC power supply voltage .
In a region where the amplitude is small, a voltage command correction unit that changes a voltage command so as not to intersect with the triangular wave so as to thin out the switching, a triangular wave output from the triangular wave generation unit, and a voltage output from the voltage command correction unit The voltage command correction value is input, and the PWM
A single-phase P having a triangular wave comparing means for outputting a control signal
It is a WM converter control device.

[0010]

According to the single-phase PWM converter control device of the invention according to any one of claims 1 to 3 , every 1 / 6π to 5 / 6π of the power supply voltage on the AC side of the converter is provided.
In the region where the amplitude is large , a high frequency triangular wave (high switching frequency) is used as the triangular wave, so that the current ripple can be reduced. In the region other than the region where the amplitude of the power supply voltage on the AC side of the converter is large, the low frequency triangular wave ( Since a low switching frequency is used, switching loss can be reduced. According to the single-phase PWM converter control device of the invention corresponding to claim 4, when the preset triangular wave frequency setting switching value is greater than the magnitude of the AC side current command value of the converter according to the converter AC side current command value. Since a high-frequency triangular wave (high switching frequency) is used as the triangular wave, the current ripple can be reduced, and when the preset triangular wave frequency setting switching value is smaller than the magnitude of the AC side current command value of the converter, the triangular wave becomes low. Since a frequency triangular wave (low switching frequency) is used, switching loss can be reduced. According to the single-phase PWM converter control device of the invention corresponding to claim 5, in a small amplitude region other than 1 / 6π to 5 / 6π of the AC power supply voltage of the converter, the voltage is reduced so as to reduce the switching. Since the command is changed so as not to intersect with the triangular wave, switching loss can be reduced.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. <First Embodiment> FIG. 1 shows a single-phase PWM converter control device according to the present invention. FIG. 1 (a) shows a main circuit of the single-phase converter, and FIG. 1 (b) shows the control device thereof. 8-pulse PWM with eight pulses in half cycle of AC power supply V
This is an embodiment in the case of operating in the mode.

The main circuit is a single-phase AC power supply V, a reactor L,
Capacitor C, semiconductor device having conduction control terminal, for example, gate turn-off thyristor GU, GV, GX, G
Y, diodes DU, D connected in parallel to each semiconductor element
V, DX, and DY.

The control device comprises a phase calculating means 1, a triangular wave generating means 2, a converter voltage command calculating means 3, and a triangular wave comparing means 4. The phase calculation means 1 is configured as shown in FIG. 4, for example, and receives the power supply voltage Vs of the single-phase AC power supply V, calculates the power supply voltage sine wave phase θs, and outputs the result.

The triangular wave generating means 2 is configured, for example, as shown in FIG. 2 and receives an AC power supply voltage sine wave phase θs as an input and outputs a high frequency or low frequency triangular wave TRI synchronized with the AC power supply voltage sine wave phase θs. I do.

The converter voltage command calculating means 3 is constructed, for example, as shown in FIG.
, Power supply voltage Vs, converter AC side current actual value Is
And a converter DC-side voltage command Vdc-Ref and a converter DC-side voltage actual value Vdc as input, perform predetermined arithmetic processing, and execute a U-phase voltage command VU-Ref and a V-phase voltage command VV.
-Output Ref.

The triangular wave comparing means 4 includes a triangular wave TRI output from the triangular wave generating means 2, a U-phase voltage command VU-Ref from the converter voltage command calculating means 3, and a V-phase voltage command V
V-Ref is input, and U-phase PWM is
The signal VU-PWM and the V-phase PWM signal VV-PWM are output.

FIG. 2 is a block diagram showing a configuration of the triangular wave generating means 2. The triangular wave generating means 2 includes a triangular wave frequency setting section 21, a high frequency triangular wave generating section 22, and a low frequency triangular wave It comprises a generating unit 23 and a triangular wave switching unit 24.

The triangular wave frequency setting section 21 receives the AC power supply voltage sine wave phase θs as an input, and selects either the low frequency triangular wave TRI2 or the high frequency triangular wave TRI1 according to the AC power supply voltage sine wave phase θs. Triangular wave frequency setting signal f indicating whether the triangular wave frequency has been selected
Output set.

The high-frequency triangular-wave generating section 22 receives the sine-wave phase θs of the AC power supply voltage as an input and generates a high-frequency triangular wave TRI synchronized with the sine-wave phase θs of the AC power supply voltage.
Generates and outputs 1.

The low frequency triangular wave generator 23 receives the sine wave phase θs of the AC power supply voltage as an input, and the triangular wave TRI of a low frequency synchronized with the sine wave phase θs of the AC power supply voltage.
2 is generated and output.

In the triangular wave switching unit 24, the triangular wave frequency setting signal fs output from the triangular wave frequency setting unit 21
tri, a high-frequency triangular wave TRI1 output from the high-frequency triangular wave generator 22 and a low-frequency triangular wave TRI2 output from the low-frequency triangular wave generator 23, and a triangular wave having a frequency set by the triangular frequency setting signal fset. Is output.

The operation of the triangular wave generating means 2 having such a configuration will be described with reference to FIGS. It is assumed that the power supply voltage Vs is a 50 Hz sine wave. The power supply voltage sine wave phase θs output from the phase calculation means 1 is input to the triangular wave generation means 2. Usually, the single-phase PWM converter controls the power supply power factor to be 1, so that the power supply voltage sine wave phase θs is equal to the converter AC side current command value phase.

The high-frequency triangular wave generator 22 receives the power supply voltage sine wave phase θs as an input and outputs a triangular wave TRI1 having the following constant frequency according to θs. 0 ≦ θs <(1/18) π → TRI1 = (18 / π) θs (1/18) π ≦ θs <(1/6) π → TRI1 = (− 18 / π) θs + 2 (1/6) π ≦ θs <(5/18) π → TRI1 = (18 / π) θs−4 (5/18) π ≦ θs <(7/18) π → TRI1 = (− 18 / π) θs + 6 (7 / 18) π ≦ θs <(1/2) π → TRI1 = (18 / π) θs−8 (1/2) π ≦ θs <(11/18) π → TRI1 = (− 18 / π) θs + 10 ( 11/18) π ≦ θs <(13/18) π → TRI1 = (18 / π) θs−12 (13/18) π ≦ θs <(5/6) π → TRI1 = (− 18 / π) θs +14 (5/6) π ≦ θs <(17/18) π → TRI1 = (18 / π) θs−16 (17/18) π ≦ θs <π → TRI1 = (− 18 / π) θs + 18π ≦ θs <(19/18) π → TRI1 (18 / π) θs-18 (19/18) π ≦ θs <(7/6) π → TRI1 = (− 18 / π) θs + 20 (7/6) π ≦ θs <(23/18) π → TRI1 = (18 / π) θs-22 (23/18) π ≦ θs <(25/18) π → TRI1 = (− 18 / π) θs + 24 (25/18) ≦ θs <(3/2) π → TRI1 = (18 / π) θs-26 (3/2) π ≦ θs <(29/18) π → TRI1 = (− 18 / π) θs + 28 (29/18) ≦ θs <(31/18) π → TRI1 = (18 / π) θs-30 (31/18) π ≦ θs <(11/6) π → TRI1 = (− 18 / π) θs + 32 (11/6) ≦ θs <(35/18) ) Π → TRI1 = (18 / π) θs−34 (35/18) π ≦ θs <2π → TRI1 = (− 18 / π) θs + 36 In the low frequency triangular wave generator 23, As input voltage sine wave phase [theta] s, in accordance with [theta] s, and outputs the triangular wave TRI2 a constant frequency as shown below. 0 ≦ θs <(1/6) π → TRI2 = (− 12 / π) θs + 1 (1/6) π ≦ θs <(1/3) π → TRI2 = (12 / π) θs-3 (1 / 3) π ≦ θs <(1/2) π → TRI2 = (− 12 / π) θs + 5 (1/2) π ≦ θs <(2/3) π → TRI2 = (12 / π) θs−7 ( 2/3) π ≦ θs <(5/6) π → TRI2 = (− 12 / π) θs + 9 (5/6) π ≦ θs <π → TRI2 = (12 / π) θs-11 π ≦ θs < (7/6) π → TRI2 = (− 12 / π) θs + 13 (7/6) π ≦ θs <(4/3) π → TRI2 = (12 / π) θs-15 (4/3) π ≦ θs <(3/2) π → TRI2 = (− 12 / π) θs + 17 (3/2) π ≦ θs <(5/3) π → TRI2 = (12 / π) θs−19 (5/3) π ≦ θs <(11/6) π → TRI2 = (− 12 / π) θs + 21 (11/6 ) Π ≦ θs <2π → TRI2 = (12 / π) θs−23 In the triangular wave frequency setting unit 21, the power supply voltage sine wave phase θs is input, and according to the power supply voltage sine wave phase θs,
The triangular wave frequency setting signal fset is output by the next conditional branch. That is, (1/6) π ≦ θs <(5/6)
When π, (7/6) π ≦ θs <(11/6) π, fset = 110 ≦ θs <(1/6) π, (5/6) π ≦ θs <(7 /
6) When π, (11/6) π ≦ θs <2π, fset = 2 is output.

In the triangular wave switching unit 24, a triangular wave frequency setting signal fse output from the triangular wave frequency setting unit 21 is output.
t and TRI1 which is the output of the high frequency triangular wave generation unit 22
And TRI2, which is the output of the low-frequency triangular wave generator 23, are input, and according to the triangular wave frequency setting signal fest, the two input triangular waves T
Triangular waves TRI1 and TRI2 are selected and output from RI1 and TRI2. That is, when fest = 1, triangular wave TRI = TRI1, when fest = 2, triangular wave TRI = TRI2 With the above operations, the triangular wave TRI output from the triangular wave generating means 2 becomes as shown in FIG.

FIG. 4 is a block diagram showing the configuration of the phase calculation means 1. The phase calculator 1 includes an integrator 11, a square wave generator 12, and a rising detector 13. The square wave generator 12 receives the waveform of the power supply voltage Vs and generates a square wave Vsqr according to the following conditional branch. That is, when Vs ≧ 0, Vsqr = 1, and when Vs <0, Vsqr = 0. The rising detector 13 receives the output Vsqr from the square wave generator 12 at the moment when Vsqr changes from 0 to 1. Generate and output a pulse VOP.

The integrator 11 receives the power supply frequency fs as input and performs time integration of fs. Rise detector 1
When the output pulse VOP of No. 3 is input, the integrated value is reset to zero, time integration is started again, and the integrated value is output as the power supply voltage sine wave phase θs.

FIG. 5 is a block diagram showing the structure of the converter voltage command calculating means 3. The converter voltage command calculating means 3 includes a sine wave generator 31 and a current command amplitude calculator 3
2, the current command calculator 33, and the comparators 34, 35, 36
, A divider 37, and a coefficient unit 38.

The sine wave generator 31 receives the power supply voltage sine wave phase θs as an input and generates a sine wave si according to θs.
n (θs) is output. The current command amplitude calculator 32 converts the converter DC side voltage command V
A deviation ΔVdc between dc-Ref and the converter DC side voltage actual value Vdc is input, and a value obtained by multiplying ΔVdc by a gain G (s) is output as a current command amplitude | Is |.

In the current command calculator 33, the output sin (θs) of the sine wave generator 31 and the output | Is | of the current command amplitude calculator 32 are input, and a value obtained by multiplying both is used as a converter AC side current command. Output as the value Is-Ref.
That is, Is−Ref = | Is | × sin (θs).

The comparator 35 calculates a deviation ΔIs from the output Is−Ref of the current command calculator 33 and the actual value AC of the converter AC current. In the comparator 36, a value obtained by subtracting the deviation ΔIs output from the comparator 35 from the AC power supply voltage Vs is obtained.
The output of the divider 37 for obtaining a value obtained by multiplying by the converter DC current Vdc is defined as a U-phase voltage command VU-Ref, and the value obtained by multiplying VU-Ref by −1 by the coefficient unit 38 is expressed by V
Output as the phase voltage command VV-Ref. That is, VU-Ref = 1 / (2 · Vdc) [Vs− (Is−Ref−Is)] VV−Ref = −1 / (2 · Vdc) [Vs− (Is−Ref−Is)].

In the triangular wave comparing means 4, the output TRI of the triangular wave generating means 2 and the converter voltage command calculating means 3
, And the U-phase PWM signal VU-PWM and V-phase PWM by the following conditional branches.
An M signal VV-PWM is output.

When VU-Ref ≧ TRI, VU-PWM = 1, when VU-Ref <TRI, VU-PWM = 0, when VV-Ref ≧ TRI, when VV-PWM = 1, when VV-Ref <TRI, VV-PWM = 0 According to the first embodiment described above, when the amplitude of the power supply voltage on the AC side of the converter is large, a high-frequency triangular wave (high switching frequency) is used as the triangular wave, so that the current ripple can be reduced. In a region other than the region where the amplitude of the power supply voltage on the AC side of the converter is large, a low-frequency triangular wave (low switching frequency) is used as the triangular wave, so that switching loss can be reduced.

<Second Embodiment> FIG. 6 is a block diagram showing a second embodiment of the present invention.
This is an example in which a plurality of M converters CONa, CONb, CONc CONd are connected in parallel by transformers TRa, TRb, TRc, TRd.

Loads LDa, LDb, LDc and LDd are connected to the output sides of the converters CONa to CONd via capacitors Ca, Cb, Cc and Dd, respectively. Each of the four single-phase PWM converters CONa to CONd is controlled. As shown in FIG. 1, the four single-phase PWM converter control devices have respective triangular wave generating means 2.
a, 2b, 2c and 2d generate the following triangular waves such that the phases of the triangular waves generated from each other are shifted as shown in FIG.

In the triangular wave generating means 2a of the sputum total PWM converter control device for controlling the single-phase PWM converter CONa, in the high frequency triangular wave generating section 22 of FIG.
The power supply voltage sine wave phase θs is input, and a triangular wave TRI1a having the following constant frequency is output according to θs. 0 ≦ θs <(1/18) π → TRI1a = (18 / π) θs (1/18) π ≦ θs <(1/6) π → TRI1a = (− 18 / π) θs + 2 (1/6) π ≦ θs <(5/18) π → TRI1a = (18 / π) θs−4 (5/18) π ≦ θs <(7/18) π → TRI1a = (− 18 / π) θs + 6 (7 / 18) π ≦ θs <(1/2) π → TRI1a = (18 / π) θs−8 (1/2) π ≦ θs <(11/18) π → TRI1a = (− 18 / π) θs + 10 (18) 11/18) π ≦ θs <(13/18) π → TRI1a = (18 / π) θs−12 (13/18) π ≦ θs <(5/6) π → TRI1a = (− 18 / π) θs +14 (5/6) π ≦ θs <(17/18) π → TRI1a = (18 / π) θs−16 (17/18) π ≦ θs <π → TRI1a = (− 18 / π) θs + 18π ≦ θs <(19/1) ) Π → TRI1a = (18 / π) θs−18 (19/18) π ≦ θs <(7/6) π → TRI1a = (− 18 / π) θs + 20 (7/6) π ≦ θs <(23 / 18) π → TRI1a = (18 / π) θs-22 (23/18) π ≦ θs <(25/18) π → TRI1a = (− 18 / π) θs + 24 (25/18) π ≦ θs < (3/2) π → TRI1a = (18 / π) θs−26 (3/2) π ≦ θs <(29/18) π → TRI1a = (− 18 / π) θs + 28 (29/18) π ≦ θs <(31/18) π → TRI1a = (18 / π) θs-30 (31/18) π ≦ θs <(11/6) π → TRI1a = (− 18 / π) θs + 32 (11/6) π ≦ θs <(35/18) π → TRI1a = (18 / π) θs−34 (35/18) π ≦ θs <2π → TRI1a = (− 18 / π) θs + 36 At low frequencies the triangular wave generating unit 23 inputs the power supply voltage sinusoidal phase [theta] s, in accordance with [theta] s, and outputs the triangular wave TRI2a constant frequency following. 0 ≦ θs <(1/6) π → TRI2a = (− 12 / π) θs + 1 (1/6) π ≦ θs <(1/3) π → TRI2a = (12 / π) θs-3 (1 / 3) π ≦ θs <(1/2) π → TRI2a = (− 12 / π) θs + 5 (1/2) π ≦ θs <(2/3) π → TRI2a = (12 / π) θs-7 ( 2/3) π ≦ θs <(5/6) π → TRI2a = (− 12 / π) θs + 9 (5/6) π ≦ θs <π → TRI2a = (12 / π) θs-11 π ≦ θs < (7/6) π → TRI2a = (− 12 / π) θs + 13 (7/6) π ≦ θs <(4/3) π → TRI2a = (12 / π) θs-15 (4/3) π ≦ θs <(3/2) π → TRI2a = (− 12 / π) θs + 17 (3/2) π ≦ θs <(5/3) π → TRI2a = (12 / π) θs−19 (5/3) π ≦ θs <(11/6) π → TRI2a = (− 12 / π) θs + 21 (11/6) π ≦ θs <2π → TRI2a = (12 / π) θs-23 Other configurations and operations are controlled according to the first embodiment.

Similarly, the triangular wave generating means 2b of the single-phase PWM converter control device for controlling the single-phase converter CONb
2, the high frequency triangular wave generator 22 of FIG. 2 receives the power supply voltage sine wave phase θs as an input and outputs a triangular wave TRI1b having the following constant frequency according to θs. 0 ≦ θs <(1/9) π → TRI1b = (− 18 / π) θs + 1 (1/9) π ≦ θs <(2/9) π → TRI1b = (18 / π) θs−3 (2 / 9) π ≦ θs <(1/3) π → TRI1b = (− 18 / π) θs + 5 (1/3) π ≦ θs <(4/9) π → TRI1b = (18 / π) θs−7 4/9) π ≦ θs <(5/9) π → TRI1b = (− 18 / π) θs + 9 (5/9) π ≦ θs <(2/3) π → TRI1b = (18 / π) θs− 11 (2/3) π ≦ θs <(7/9) π → TRI1b = (− 18 / π) θs + 13 (7/9) π ≦ θs <(8/9) π → TRI1b = (18 / π) θs−15 (8/9) π ≦ θs <π → TRI1b = (− 18 / π) θs + 17 π ≦ θs <(10/9) π → TRI1b = (18 / π) θs−19 (10/9) π ≦ θs <(11/9) π → TRI1b = (− 18 / π) θs + 21 (11/9) π ≦ θs <(4/3) π → TRI1b = (18 / π) θs−23 (4/3) π ≦ θs <(13/9) π → TRI1b = (− 18 / π) θs + 25 (13/9) π ≦ θs <(14/9) π → TRI1b = (18 / π) θs−27 (14/9) π ≦ θs <(5/3) π → TRI1b = (− 18 / π) θs + 29 (5/3) π ≦ θs <(16/9) π → TRI1b = (18 / π) θs−31 (16/9) π ≦ θs <(17/9) π → TRI1b = (−18 / π) θs + 33 (17/9) π ≦ θs <2π → TRI1b = (18 / π) θs−35 In the low-frequency triangular wave generator 23b, the power supply voltage sine wave phase θs is input, and according to θs. , And outputs a triangular wave TRI2b having the following constant frequency. 0 ≦ θs <(1/12) π → TRI2b = (− 12 / π) θs (1/12) π ≦ θs <(3/12) π → TRI2b = (12 / π) θs−2 (3/12 ) Π ≦ θs <(5/12) π → TRI2b = (− 12 / π) θs + 4 (5/12) π ≦ θs <(7/12) π → TRI2b = (12 / π) θs−6 (7 / 12) π ≦ θs <(9/12) π → TRI2b = (− 12 / π) θs + 8 (9/12) π ≦ θs <(11/12) π → TRI2b = (12 / π) θs−10 (11/12) π ≦ θs <(13/12) π → TRI2b = (− 12 / π) θs + 12 (13/12) π ≦ θs <(15/12) π → TRI2b = (12 / π) θs −14 (15/12) π ≦ θs <(17/12) π → TRI2b = (− 12 / π) θs + 16 (17/12) π ≦ θs <(19/12) π → TRI2b = (12 / π) θs-18 (19/12) π ≦ θs <(21/12) π → TRI2b = (− 12 / π) θs + 20 (21/12) π ≦ θs <(23/12) π → TRI2b = ( 12 / π) θs-22 (23/12) π ≦ θs <2π → TRI2b = (− 12 / π) θs + 24 Other configurations and operations are controlled in accordance with the first embodiment.

Similarly, in the triangular wave generating means 2c of the single-phase PWM converter control device for controlling the single-phase PWM converter CONc, the high-frequency triangular wave generating section 22 receives the power supply voltage sine wave phase θs as an input. A triangular wave TRI1c having a constant frequency shown in FIG. 0 ≦ θs <(1/36) π → TRI1c = (18 / π) θs + 1/2 (1/36) π ≦ θs <(5/36) π → TRI1c = (− 18 / π) θs + 3/2 (5/36) π ≦ θs <(9/36) π → TRI1c = (18 / π) θs−7 / 2 (9/36) π ≦ θs <(13/36) π → TRI1c = (− 18 / π) θs + 11/2 (13/36) π ≦ θs <(17/36) π → TRI1c = (18 / π) θs-15 / 2 (17/36) π ≦ θs <(21/36) π → TRI1c = (− 18 / π) θs + 19/2 (21/36) π ≦ θs <(25/36) π → TRI1c = (18 / π) θs-23 / 2 (25/36) π ≦ θs <( 29/36) π → TRI1c = (− 18 / π) θs + 27/2 (29/36) π ≦ θs <(33/36) π → TRI1c = (18 / π) θs-31 / 2 (33 36) π ≦ θs <(37/36) π → TRI1c = (− 18 / π) θs + 35/2 (37/36) π ≦ θs <(41/36) π → TRI1c = (18 / π) θs− 39/2 (41/36) π ≦ θs <(45/36) π → TRI1c = (− 18 / π) θs + 43/2 (45/36) π ≦ θs <(49/36) π → TRI1c = ( 18 / π) θs -47/2 (49/36) π ≦ θs <(53/36) π → TRI1c = (− 18 / π) θs + 51/2 (53/36) π ≦ θs <(57/36) ) Π → TRI1c = (18 / π) θs−55 / 2 (57/36) π ≦ θs <(61/36) π → TRI1c = (− 18 / π) θs + 59/2 (61/36) π ≦ θs <(65/36) π → TRI1 = (18 / π) θs−63 / 2 (65/36) π ≦ θs <(69/36) π → TRI1c = (− 1 / Π) θs + 67/2 (69/36) π ≦ θs <2π → TRI1c = (18 / π) θs−71 / 2 In the low frequency triangular wave generator 23, the power supply voltage sine wave phase θs is input, and θs , A triangular wave TRI2c having the following constant frequency is output. 0 ≦ θs <(3/24) π → TRI2c = (− 12 / π) θs + 1/2 (3/24) π ≦ θs <(7/24) π → TRI2c = (12 / π) θs−5 / 2 (7/24) π ≦ θs <(11/24) π → TRI2c = (− 12 / π) θs + 9/2 (11/24) π ≦ θs <(15/24) π → TRI2c = (12 / π) θs-13 / 2 (15/24) π ≦ θs <(19/24) π → TRI2c = (− 12 / π) θs + 17/2 (19/24) π ≦ θs <(23/24) π → TRI2c = (12 / π) θs -1/2 (23/24) π ≦ θs <(27/24) π → TRI2c = (-12 / π) θs +25/2 (27/24) π ≦ θs < (31/24) π → TRI2c = (12 / π) θs−29 / 2 (31/24) π ≦ θs <(35/24) π → TRI2c = (− 12 / π) θs + 33/2 35/24) π ≦ θs <(39/24) π → TRI2c = (12 / π) θs−37 / 2 (39/24) π ≦ θs <(43/24) π → TRI2c = (− 12 / π ) Θs + 41/2 (43/24) π ≦ θs <(47/24) π → TRI2c = (12 / π) θs−45 / 2 (47/24) π ≦ θs <2π → TRI2c = (− 12 / π) θs +49/2 Other configurations and operations are controlled according to the first embodiment.

Similarly, the triangular wave generating means 2d of the single-phase PWM converter control device for controlling the single-phase converter CONd
In FIG. 2, the high-frequency triangular wave generator 22 receives the power supply voltage sine wave phase θs as an input and outputs a triangular wave TRI1d having the following constant frequency according to θs. 0 ≦ θs <(3/36) π → TRI1c = (− 18 / π) θs + 1/2 (3/36) π ≦ θs <(7/36) π → TRI1d = (18 / π) θs-5 / 2 (7/36) π ≦ θs <(11/36) π → TRI1d = (− 18 / π) θs + 9/2 (11/36) π ≦ θs <(15/36) π → TRI1d = (18 / π) θs-13 / 2 (15/36) π ≦ θs <(19/36) π → TRI1d = (− 18 / π) θs + 17/2 (19/36) π ≦ θs <(23/36) π → TRI1d = (18 / π) θs -1/2 (23/36) π ≦ θs <(27/36) π → TRI1d = (-18 / π) θs +25/2 (27/36) π ≦ θs < (31/36) π → TRI1d = (18 / π) θs−29 / 2 (31/36) π ≦ θs <(35/36) π → TRI1d = (− 18 / π) θs + 33/2 35/36) π ≦ θs <(39/36) π → TRI1d = (18 / π) θs−37 / 2 (39/36) π ≦ θs <(43/36) π → TRI1d = (− 18 / π ) Θs + 41/2 (43/36) π ≦ θs <(47/36) π → TRI1d = (18 / π) θs−45 / 2 (47/36) π ≦ θs <(51/36) π → TRI1d = (− 18 / π) θs +49/2 (51/36) π ≦ θs <(55/36) π → TRI1d = (18 / π) θs−53 / 2 (55/36) π ≦ θs <(59 / 36) π → TRI1d = (− 18 / π) θs + 57/2 (59/36) π ≦ θs <(63/36) π → TRI1d = (18 / π) θs−61 / 2 (63/36) π ≦ θs <(67/36) π → TRI1d = (− 18 / π) θs + 65/2 (67/36) π ≦ θs <(71/36) π → TRI1d = (18 / π) θs−69 / 2 (71/36) π ≦ θs <2π → TRI1d = (− 18 / π) θs + 73/2 In the low frequency triangular wave generation unit 23d, the power supply voltage sine wave phase θs is input. And outputs the following triangular wave TRI2d having a constant frequency according to θs. 0 ≦ θs <(1/24) π → TRI2d = (− 12 / π) θs−1 / 2 (1/24) π ≦ θs <(5/24) π → TRI2d = (12 / π) θs-3 / 2 (5/24) π ≦ θs <(9/24) π → TRI2d = (− 12 / π) θs + 7/2 (9/24) π ≦ θs <(13/24) π → TRI2d = (12 / Π) θs-11 / 2 (13/24) π ≦ θs <(17/24) π → TRI2d = (− 12 / π) θs + 15/2 (17/24) π ≦ θs <(21/24) π → TRI2d = (12 / π) θs−19 / 2 (21/24) π ≦ θs <(25/24) π → TRI2d = (− 12 / π) θs + 23/2 (25/24) π ≦ θs <(29/24) π → TRI2d = (12 / π) θs−27 / 2 (29/24) π ≦ θs <(33/24) π → TRI2d = (− 12 / π) θs + 31/2 (3 / 24) π ≦ θs <(37/24) π → TRI2d = (12 / π) θs−35 / 2 (37/24) π ≦ θs <(41/24) π → TRI2d = (− 12 / π) θs + 39/2 (41/24) π ≦ θs <(45/24) π → TRI2d = (12 / π) θs−43 / 2 (45/24) π ≦ θs <2π → TRI2d = (− 12 / π ) Θs +47/2 Other configurations and operations are controlled according to the first embodiment.

As in the first embodiment, the triangular wave generating means 2a
To 2d output the triangular waves TRIa, TRIb shown in FIG.
, TRIc, and TRId, a PWM waveform that does not increase the current peak value even when the number of switching operations is reduced can be output. <Third Embodiment> FIG. 8 is a block diagram showing a main part of a third embodiment of the present invention, that is, a triangular wave generating means 2. In the first embodiment, the triangular wave generating means 2 comprises only a triangular wave storage unit 25. This is an example.

The triangular wave storage unit 25 receives the power supply voltage sine wave phase θs as input and outputs the following triangular wave TRI according to θs. 0 ≦ θs <(1/6) π → TRI = (− 12 / π) θs + 1 (1/6) π ≦ θs <(5/18) π → TRI = (18 / π) θs-4 (5 / 18) π ≦ θs <(7/18) π → TRI = (− 18 / π) θs + 6 (7/18) π ≦ θs <(1/2) π → TRI = (18 / π) θs−8 ( 1/2) π ≦ θs <(11/18) π → TRI = (− 18 / π) θs + 10 (11/18) π ≦ θs <(13/18) π → TRI = (18 / π) θs− 12 (13/18) π ≦ θs <(5/6) π → TRI = (− 18 / π) θs + 14 (5/6) π ≦ θs <π → TRI = (12 / π) θs-11π ≦ θs <(7/6) π → TRI = (− 12 / π) θs + 13 (7/6) π ≦ θs <(23/18) π → TRI = (18 / π) θs-22 (23/18) π ≦ θs <(25/18) π → TRI = (− 18 / π) θs 24 (25/18) π ≦ θs <(3/2) π → TRI = (18 / π) θs−26 (3/2) π ≦ θs <(29/18) π → TRI = (− 18 / π) ) Θs + 28 (29/18) π ≦ θs <(31/18) π → TRI = (18 / π) θs-30 (31/18) π ≦ θs <(11/6) π → TRI = (− 18) / Π) θs + 32 (11/6) π ≦ θs <2π → TRI = (12 / π) θs-23 Other configurations and operations are controlled according to the first embodiment.

As in the first embodiment, by obtaining a PWM waveform using the triangular wave output from the triangular wave generating means 2, it is possible to output a PWM waveform whose current peak value does not increase even if the number of switching operations is reduced. <Fourth Embodiment> FIGS. 9 and 10 show the overall structure of a control device and a triangle generating means 2 according to a fourth embodiment of the present invention.
FIG. 3 is a block diagram showing the configuration of FIG.

In FIG. 9, the difference from the embodiment of FIG. 1 is that the converter AC command current value is output from converter voltage command calculating means 3 to triangular wave generating means 2, and the other points are shown in FIG. Therefore, the description is omitted.

The triangular wave generating means 2 is configured as shown in FIG. 10. The difference from FIG. 2 is that the triangular wave frequency / frequency setting unit 21 in the triangular wave generating means 2 sets the magnitude of the converter AC current command value. Based on the triangular wave frequency setting signal f
The point is to determine the set.

The operation of the triangular wave frequency setting section 21 will be described with reference to FIG. The triangular wave frequency setting unit 21 receives the converter AC side current command value as input and outputs a triangular wave frequency setting signal fset as follows according to the magnitude of the converter AC side current command value.

The predetermined triangular wave frequency setting switching value is Is-set. At this time, when | Is | <Is−set, fset = 1, and when | Is | ≧ Is−set, fset = 2 is output.

Other configurations and operations are controlled according to the first embodiment. As in the first embodiment, by obtaining the PWM waveform using the triangular wave output from the triangular wave generating means 2, it is possible to output a PWM waveform in which the current peak value does not increase even if the number of switching operations is reduced. <Fifth Embodiment> FIG. 11 is a block diagram showing the overall configuration of a control device according to a fifth embodiment of the present invention, in which there are seven pulses in a half cycle of an AC power supply, and the embodiment operates in a seven-pulse mode. It is.

As in the first embodiment shown in FIG. 1, this is composed of a phase calculating means 1, a triangular wave generating means 2, a converter voltage command calculating means 3, and a triangular wave comparing means 4. Command correction calculation means 5 is added.

The phase calculation means 1 is configured as shown in FIG. 4, for example, and receives the power supply voltage Vs of the single-phase AC power supply V, calculates the power supply voltage sine wave phase θs, and outputs the result. The triangular wave generating means 2 receives the AC power supply voltage sine wave phase θs as an input and outputs a triangular wave TRI of a constant frequency synchronized with the AC power supply voltage sine wave phase θs.

The converter voltage command calculating means 3 is constituted, for example, as shown in FIG.
, Power supply voltage Vs, converter AC side current actual value Is
And a converter DC-side voltage command Vdc-Ref and a converter DC-side voltage actual value Vdc as input, perform predetermined arithmetic processing, and execute a U-phase voltage command VU-Ref and a V-phase voltage command VV.
-Output Ref.

The voltage command correction calculating means 5 includes a converter voltage command value (U-phase voltage command VU-Ref and V-phase voltage command VV-R) calculated by the converter voltage command calculating means 3.
ef) and the AC power supply voltage sine wave phase θs, and outputs a voltage command correction value VU-Ref ′ and a V-phase voltage command VV-Ref ′ obtained by correcting the converter voltage command value according to the AC power supply voltage phase θs.

The triangular wave comparing means 4 includes a triangular wave TRI output from the triangular wave generating means 2 and voltage command correction values VU-Ref 'and VV-Re output from the voltage command correcting means 3.
f 'is input and PWM voltage patterns VU-PWM and VV-PWM are output based on the result of comparison between the two.

The operation and effect of the fifth embodiment having such a configuration will be described below with reference to FIG. Now
In the triangle generating means 2, the AC power supply voltage sine wave phase θ
When s is input, a triangular wave TRI having a constant frequency is output according to θs as shown in FIG.

0 ≦ θs <(1/9) π → TRI = (18 / π) θs −1 (1/9) π ≦ θs <(2/9) π → TRI = (− 18 / π) θs + 3 (2/9) π ≦ θs <(3/9) π → TRI = (18 / π) θs-5 (3/9) π ≦ θs <(4/9) π → TRI = (− 18 / π) θs + 7 (4/9) π ≦ θs <(5/9) π → TRI = (18 / π) θs-9 (5/9) π ≦ θs <(6/9) π → TRI = (− 18 / π) θs + 11 (6/9) π ≦ θs <(7/9) π → TRI = (18 / π) θs-13 (7/9) π ≦ θs <(8/9) π → TRI = (− 18 / π) θs + 15 (8/9) π ≦ θs <(9/9) π → TRI = (18 / π) θs-17 (9/9) π ≦ θs <(10/9) π → TRI = (−18 / π) θs + 19 (10/9) π ≦ θs <(11/9) π → TRI = (18 / π) θs−2 1 (11/9) π ≦ θs <(12/9) π → TRI = (− 18 / π) θs + 23 (12/9) π ≦ θs <(13/9) π → TRI = (18 / π) θs−25 (13/9) π ≦ θs <(14/9) π → TRI = (− 18 / π) θs + 27 (14/9) π ≦ θs <(15/9) π → TRI = (18 / π) θs−29 (15/9) π ≦ θs <(16/9) π → TRI = (− 18 / π) θs + 31 (16/9) π ≦ θs <(17/9) π → TRI = 18 / π) θs−33 (17/9) π ≦ θs <(18/9) π → TRI = (− 18 / π) θs + 35 In the voltage command correction means 5, the output is provided from the converter voltage command calculation means 3. Converter voltage command value VU-
Ref, V-phase voltage command VV-Ref and AC power supply voltage sine wave phase θs as inputs, and AC power supply voltage sine wave phase θs
According to FIG. 1, the converter voltage command value is changed as shown in FIG.
2 and the voltage command correction values VU-Ref ′, V
The phase voltage command correction value VV-Ref 'is output.

0 ≦ θs <(1/9) π → VU-Ref ′ = − 1 0 ≦ θs <(1/9) π → VV-Ref ′ = − 1 (1/9) π ≦ θs <(8 / 9) π → VU-Ref ′ = VU-Ref (1/9) π ≦ θs <(8/9) π → VV-Ref ′ = VV-Ref (8/9) π ≦ θs <(10/9) ) Π → VU-Ref ′ = 1 (10/9) π ≦ θs <(17/9) π → VU-Ref ′ = VU-Ref (10/9) π ≦ θs <(17/9) π → VV −Ref ′ = VV−Ref (17/9) π ≦ θs <(18/9) π → VU-Ref ′ = − 1 (17/9) π ≦ θs <(18/9) π → VV-Ref ′ = -1 phase operation means 1, converter voltage command operation means 3,
It goes without saying that the triangular wave comparing means 4 operates in the same manner as in the first embodiment.

As described above, PW is performed using the triangular wave TRI from the triangular wave generating means 2 and the voltage command correction values VU-Ref 'and VV-Ref' from the voltage command correcting means 5.
By obtaining the M waveform, it is possible to obtain a PWM waveform in which the current peak value does not increase even if the number of switching operations is reduced.

[0056]

According to the present invention, it is possible to provide a single-phase PWM converter control device capable of reducing switch gross of a PWM converter without adding a current smoothing reactor or the like.

[Brief description of the drawings]

FIGS. 1A and 1B are block diagrams showing a main circuit and a control device showing an entire configuration of a first embodiment of a single-phase PWM converter control device according to the present invention.

FIG. 2 is a functional block diagram showing an example of a triangular wave generating unit of FIG.

FIG. 3 shows a triangular waveform and PWM in the first embodiment of FIG. 1;
The figure which shows a waveform.

FIG. 4 is a functional block diagram illustrating an example of a phase calculation unit in FIG. 1;

FIG. 5 is a functional block diagram showing an example of a converter voltage calculating means of FIG. 1;

FIG. 6 is a configuration diagram showing a circuit configuration in a second embodiment of the single-phase PWM converter control device according to the present invention.

FIG. 7 is a diagram showing a triangular wave output from triangular wave generating means 2a to 2d in a second embodiment according to the present invention.

FIG. 8 is a functional block diagram showing a configuration of a triangular wave generator in a third embodiment according to the present invention.

FIG. 9 is a functional block diagram illustrating an overall control configuration according to a fourth embodiment of the present invention.

FIG. 10 is a functional block diagram showing a configuration of a triangular wave generator in a fourth embodiment according to the present invention.

FIG. 11 is a functional block diagram illustrating an overall control configuration according to a fifth embodiment of the present invention.

FIG. 12 is a diagram showing a triangular waveform and a PWM waveform for explaining the operation and effect of FIG. 11;

FIG. 13 is a functional block diagram showing a configuration of a conventional triangular wave generating means.

[Explanation of symbols]

V: Single-phase AC power supply, L: Reactor, CON: Converter, C: Capacitor, 1: Phase calculation means, 2 ... Triangular wave generation means, 3 ... Converter voltage command calculation means, 4 ... Triangle wave comparison means, 5: Voltage command correction Means, 21: triangular wave frequency setting unit, 22: high frequency triangular wave generating unit, 23: low frequency triangular wave generating unit, 24: triangular wave switching unit.

Claims (5)

(57) [Claims] 1. A single-phase PWM converter control device for converting AC power into DC power by switching a switching element in a main circuit of a single-phase converter according to a PWM control signal. A phase calculating means for calculating and outputting a voltage sine wave phase; and inputting the AC power supply voltage sine wave phase, and according to the AC power supply voltage sine wave phase, 1 / 6π of the AC power supply voltage.
5 / a large area of amplitude, such as is 6π select high-frequency triangular wave, except in regions of large amplitude the AC power supply voltage selecting low-frequency triangular wave, triangular wave frequency that indicates the selected the one of the triangular wave frequency A triangular wave frequency setting unit that outputs a setting signal; a high frequency triangular wave generating unit that receives the sine wave phase of the AC power supply voltage and outputs a high frequency triangular wave synchronized with the sine wave phase of the AC power supply voltage; A low-frequency triangular wave generating unit that receives a wave phase as an input and outputs a low-frequency triangular wave synchronized with the sine wave phase of the AC power supply voltage, and generates the high-frequency triangular wave corresponding to the triangular wave frequency setting signal output from the triangular wave frequency setting unit. A high-frequency triangular wave output from the low-frequency triangular wave output section or a low-frequency triangular wave output from the low-frequency triangular wave generating section. When configured triangular wave generation means, the AC power source voltage sine wave phase, and the AC power supply voltage,
A converter AC current, a DC voltage command value, and a converter voltage command calculating means for calculating and outputting a converter voltage command with the DC voltage as input, a triangular wave output from the triangular wave generating means, and a converter voltage command calculating means. A single-phase PWM converter control device, comprising: a triangular wave comparing means for calculating and outputting the PWM control signal with an output converter voltage command as an input. 2. Each switching element in a main circuit of a plurality of single-phase converters, each of which is connected in parallel, is denoted by P
In a single-phase PWM converter control device that converts AC power into DC power by switching with a WM control signal, a phase calculation unit that inputs an AC power supply voltage and calculates and outputs a sine wave phase of the AC power supply voltage; A voltage sine wave phase is input, and according to the AC power supply voltage sine wave phase, 1 / 6π of the AC power supply voltage is used.
A plurality of triangular wave frequency setting units for outputting a triangular wave frequency setting signal for selecting a high frequency triangular wave in a region having a large amplitude such as .about.5 / 6π and for selecting a low frequency triangular wave in a region other than a region having a large amplitude of the AC power supply voltage. And a plurality of single-phase PWs synchronized with the AC power supply voltage sine wave phase and connected in parallel with the AC power supply voltage sine wave phase.
So that the high-frequency triangular wave of the M converter has a phase difference,
A plurality of high-frequency triangular wave generators that output high-frequency triangular waves that are out of phase, and the AC power supply voltage sine wave phase are input, synchronized with the AC power supply voltage sine wave phase, and a plurality of units connected in parallel. A plurality of low-frequency triangular wave generators for generating low-frequency triangular waves having different phases so that the low-frequency triangular waves of the single-phase PWM converter have a phase difference; and setting each triangular wave frequency output from each of the triangular wave frequency setting units. A triangular wave composed of a plurality of triangular wave switching units that output each high frequency triangular wave corresponding to a signal or output each low frequency triangular wave output from each low frequency triangular wave generating unit or each low frequency triangular wave output from each low frequency triangular wave generating unit Generating means, the AC power supply voltage sine wave phase, the AC power supply voltage,
A converter AC current, a DC voltage command value, and a converter voltage command calculating means for calculating and outputting a converter voltage command with the DC voltage as input, a triangular wave output from the triangular wave generating means, and a converter voltage command calculating means. A single-phase PWM converter control device, comprising: a triangular wave comparing means for calculating and outputting the PWM control signal with an output converter voltage command as an input. 3. A single-phase PWM converter control device for converting AC power into DC power by switching a switching element in a main circuit of a single-phase converter according to a PWM control signal. A phase calculation means for calculating and outputting a voltage sine wave phase; and a triangular wave storage unit. The triangular wave storage unit receives the AC power supply voltage sine wave phase as input, and calculates in advance according to the AC power supply voltage sine wave phase. For each of the stored 1 / 6π to 5 / 6π of the AC power supply voltage
A triangular wave generating means for outputting a high-frequency triangular wave in synchronization with the AC power supply voltage in a region where the amplitude is large, and outputting a low-frequency triangular wave in synchronization with the AC power supply voltage in regions other than a region where the amplitude of the AC power supply voltage is large. The AC power supply voltage sine wave phase, the AC power supply voltage,
A converter AC current, a DC voltage command value, and a converter voltage command calculating means for calculating and outputting a converter voltage command with the DC voltage as input, a triangular wave output from the triangular wave generating means, and a converter voltage command calculating means. A single-phase PWM converter control device, comprising: a triangular wave comparing means for calculating and outputting the PWM control signal with an output converter voltage command as an input. 4. A single-phase PWM converter control device for converting AC power into DC power by switching a switching element in a main circuit of a single-phase converter according to a PWM control signal. A phase calculating means for calculating and outputting a voltage sine wave phase; and inputting an AC-side current command value of the converter and inputting a high-frequency triangular wave when the converter AC-side current command value is smaller than a preset triangular frequency setting switching value. A triangular wave frequency setting section for outputting a triangular wave frequency setting signal for selecting a low frequency triangular wave when the converter AC side current command value is larger than a preset triangular frequency setting switching value; High-frequency triangular wave that takes a wave phase as input and outputs a high-frequency triangular wave A wave generator, a low-frequency triangular wave generator that receives the AC power supply voltage sine wave phase as input, and outputs a low-frequency triangular wave synchronized with the AC power supply voltage sine wave phase, and a triangular wave frequency output from the triangular wave frequency setting unit. A triangular wave generating unit including a high frequency triangular wave output from the high frequency triangular wave generating unit corresponding to the setting signal, or a triangular wave switching unit outputting a low frequency triangular wave output from the low frequency triangular wave generating unit; AC power supply voltage sine wave phase, the AC power supply voltage,
A converter AC side current, a DC voltage command value, and a converter voltage command calculating means for calculating and outputting a converter voltage command and the converter AC side current command value with the DC voltage as input, and a triangular wave output from the triangular wave generating means. A single-phase PWM converter control device, comprising: a converter voltage command output from the converter voltage command calculator, and a triangular wave comparator for calculating and outputting the PWM control signal. 5. A single-phase PWM converter control device for converting AC power to DC power by switching a switching element in a main circuit of a single-phase converter by a PWM control signal. A triangular wave generating means for outputting a triangular wave of a constant frequency synchronized with the AC power supply voltage sine wave phase, the AC power supply voltage sine wave phase, and the AC power supply voltage,
A converter AC current, a DC voltage command value, and a converter voltage command calculating means for calculating and outputting a converter voltage command value with the DC voltage as input, and a converter voltage command value calculated by the converter voltage command calculating means and The sine wave phase of the AC power supply voltage is input, and every other than 1 / 6π to 5 / 6π of the AC power supply voltage
In a region where the amplitude is small, a voltage command correction unit that changes a voltage command so as not to intersect with the triangular wave so as to skip switching, a triangular wave output from the triangular wave generation unit, and a voltage output from the voltage command correction unit A single-phase PWM converter control device, comprising: a triangular wave comparing unit that receives a voltage command correction value and outputs the PWM control signal based on a comparison result between the two.