JPH10337047A - Polyphase output power converting circuit - Google Patents

Polyphase output power converting circuit

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Publication number
JPH10337047A
JPH10337047A JP9145023A JP14502397A JPH10337047A JP H10337047 A JPH10337047 A JP H10337047A JP 9145023 A JP9145023 A JP 9145023A JP 14502397 A JP14502397 A JP 14502397A JP H10337047 A JPH10337047 A JP H10337047A
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JP
Japan
Prior art keywords
phase
inverter
power
power supply
voltage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP9145023A
Other languages
Japanese (ja)
Other versions
JP3223842B2 (en
Inventor
Koetsu Fujita
Junichi Ito
淳一 伊東
光悦 藤田
Original Assignee
Fuji Electric Co Ltd
富士電機株式会社
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Publication date
Application filed by Fuji Electric Co Ltd, 富士電機株式会社 filed Critical Fuji Electric Co Ltd
Priority to JP14502397A priority Critical patent/JP3223842B2/en
Priority claimed from DE19823917A external-priority patent/DE19823917A1/en
Publication of JPH10337047A publication Critical patent/JPH10337047A/en
Application granted granted Critical
Publication of JP3223842B2 publication Critical patent/JP3223842B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00Conversion of dc power input into dc power output
    • H02M3/02Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/539Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency

Abstract

PROBLEM TO BE SOLVED: To obtain a small and inexpensive polyphase output converting circuit in which the structure is simplified by decreasing the number of switching arms and eliminating the input side reactor. SOLUTION: The polyphase output converting circuit comprises a power converter 250 performing power conversion through operation of a semiconductor switching element to produce an AC polyphase output, an AC load circuit 350 connected to the output side of the power converter 250, and a zero-phase power supply 150 connected with the AC load circuit 350. The power converter 250, the AC load circuit 350 and the zero-phase power supply 150 are connected in loop such that the voltage and the current of the zero-phase power supply 150 will be zero-phase components when viewed from the AC output side of the power converter 250 through the AC load circuit 350. Power is delivered between the power converter 250 and the AC load circuit 350 while zero-phase, power is delivered between the power converter 250 and the zero-phase power supply 150 by time sharing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-phase output power converter such as a single-phase to multi-phase power converter or a DC-multi-phase power converter. Specifically, a power converter having a converter, an inverter, and the like, an AC load circuit such as an AC motor,
A zero-phase power supply such as a single-phase AC power supply or a DC power supply or a passive element capable of storing energy is connected in a loop, and when viewed from the AC output side of the power converter, the output voltage of the zero-phase power supply and The current converter is configured so that the current becomes a zero-phase component, and the power converter performs exchange of AC power with the AC load circuit and exchange of zero-phase power with the zero-phase power supply device by time division. The present invention relates to such a multi-phase output power conversion circuit.

[0002]

2. Description of the Related Art FIG.
1 schematically shows a conventional single-phase to multi-phase power conversion circuit, 100 is a single-phase AC power supply, 200 is a single-phase to multi-phase power converter including a converter and an inverter, and 300 is an AC load circuit. Induction motor. In this prior art, the converter in the power converter 200 transfers power to and from the single-phase AC power supply 100, and the converter controls power by the line voltage of the AC power supply 100 and the current flowing between the lines. . Further, the induction motor 300 is a power converter 2
The inverter is connected to an inverter, which is an AC output power converter in 00, and power is controlled by a line voltage of the inverter and a current flowing between the lines. By connecting a large-capacity energy storage element (smoothing capacitor or DC reactor) to the DC intermediate circuit between the converter and the inverter in the power converter 200, the converter side and the inverter side can be independently controlled. It is configured as follows.

In the power converter 200, it is necessary to provide a semiconductor switching element in the converter in order to control the power supply current waveform. When a DC power supply is used instead of the single-phase AC power supply 100 and the converter, if the power supply voltage does not match the DC voltage of the inverter, the power supply voltage needs to be stepped up or down. Is required. Furthermore,
In any of the above cases, a reactor for absorbing current ripple by switching is required on the input side of the power converter 200, which hinders miniaturization and cost reduction of the device.

FIG. 20 is a circuit diagram showing a specific example of the prior art shown in FIG. 20, reference numeral 101 denotes a single-phase AC power supply, 102 denotes a reactor, 201 denotes a sine wave converter for converting an input current into a sine wave having a high power factor, 202 denotes a smoothing capacitor of a DC intermediate circuit, and 203 denotes an induction motor 3.
01 is a three-phase voltage-source inverter for driving the variable-speed drive 01 at a variable speed. In FIG. 20, the induction motor 301 is shown by an equivalent circuit. Here, in converter 201, the AC power supply voltage is short-circuited by a semiconductor switch through reactor 102 to form a waveform of an input current. As a result, the AC power is converted into the DC power, and the input current waveform is controlled in a sine wave shape.

On the other hand, an inverter 203 is a three-phase voltage-type PWM having three pairs of upper and lower arms including a self-extinguishing type semiconductor switching element such as an IGBT and an anti-parallel diode.
It is composed of an inverter and the like. The operation of the three-phase voltage-type PWM inverter is publicly known, and therefore the description is omitted.
Six types of switching patterns for controlling the three-phase line voltages by controlling the conduction state of the three arms, and all the three-phase line voltages become zero by conducting all the upper or lower arms. Two kinds of switching patterns called a so-called zero voltage vector can be selected. As described in FIG. 19, by setting the capacity of the smoothing capacitor 202 sufficiently large,
Switching of the converter 201 and the inverter 203 can be independently and freely performed.

In the configuration shown in FIG. 20, a single-phase to three-phase power converter including a converter 201 and an inverter 203 includes ten self-extinguishing type semiconductor switching elements. The circuit configuration becomes complicated and expensive if such factors are included. Converter 2
The reactor 102 on the input side 01 also hinders miniaturization.

Next, FIG. 21 shows a prior art of a DC-multiphase power conversion circuit. In the figure, reference numeral 103 denotes a DC power supply, and reference numeral 204 denotes a converter (two-quadrant chopper) including one upper and lower arm for controlling a voltage applied to the inverter 203. In this prior art, the DC power supply voltage is short-circuited by a semiconductor switch through the reactor 102 to store energy in the reactor 102, and the semiconductor 1 is turned off by turning off the semiconductor switch.
02 is supplied to the smoothing capacitor 202 together with the energy supplied from the DC power supply 103. As a result, the voltage of the smoothing capacitor 202 becomes a DC voltage higher than the power supply voltage. Also in this prior art, the switching of the converter 204 and the inverter 203 can be independently and freely performed by making the capacity of the smoothing capacitor 202 sufficiently large.

FIG. 22 shows a single-phase to multi-phase power conversion circuit as still another conventional technique. In the figure, reference numeral 104 denotes a single-phase full-wave rectifier circuit including a diode bridge, and reference numeral 205 denotes a converter whose upper arm includes only diodes. In this prior art, an AC power supply voltage is applied to a full-wave rectifier circuit 10.
4 is full-wave rectified and the DC voltage is
The input current waveform is formed by short-circuiting through 02 and by a semiconductor switch. As a result, a direct current can be obtained from an alternating current and the input current waveform can be controlled in a sine wave shape.

FIG. 21 shows a DC-multiphase power conversion circuit, FIG.
In any of the single-phase to multi-phase power conversion circuits described above, a large number of self-extinguishing semiconductor switching elements are required and the reactor 102 is required on the input side of the converters 204 and 205. There are problems such as complexity, high price, and large size.

Therefore, the present invention reduces the number of semiconductor switching elements in a single-phase to multi-phase power converter or a DC-multi-phase converter, and simplifies the circuit configuration by eliminating the reactor on the input side. It is an object of the present invention to provide a multi-phase output power conversion circuit capable of reducing the size and cost of a device.

[0011]

According to a first aspect of the present invention, there is provided a power converter for converting a power by operation of a semiconductor switching element and outputting a multi-phase alternating current, and a power converter comprising the same. An AC load circuit connected to the output side of the power converter, and a zero-phase power supply connected to the AC load circuit, and the output voltage and current of the zero-phase power supply are supplied from the AC output side of the power converter to the AC load circuit. The power converter, the AC load circuit, and the zero-phase power supply are connected in a loop so as to have a zero-phase component when viewed through, and the power converter transfers power between the AC converter and the AC load circuit by time division. It exchanges zero-phase power with the zero-phase power supply.

FIG. 1 is a conceptual diagram of the invention described in claim 1. In the figure, reference numeral 150 denotes a single-phase AC power supply, a DC power supply, or a zero-phase power supply device comprising passive elements capable of storing electric energy supplied to a load such as inductance and capacitance; A power converter that performs power conversion by the operation of a semiconductor switching element and outputs polyphase AC power, such as a phase-to-polyphase power converter or a DC-to-polyphase power converter, and 350 is a power converter that is connected to the power converter 250. And an AC load circuit such as an AC motor, a transformer, or an AC power supply via an inductance. In addition,
The power converter 250, the AC load circuit 350, and the zero-phase power supply 150 are configured such that the voltage and current of the zero-phase power supply 150 are zero-phase when viewed from the AC output side of the power converter 250 via the AC load circuit 350. They are connected in a loop so as to be separated. In this sense, the power supply is a zero-phase power supply 150.
I will call it.

In the above configuration, the exchange of AC power between the power converter 250 and the AC load circuit 350 is performed by controlling the power by the line voltage of the inverter in the power converter 250 and the current flowing between the lines. The same is done. On the other hand, between the power converter 250 and the power supply device 150, the power converter 250 controls the zero-phase voltage and the zero-phase current of the zero-phase power supply device 150 using, for example, a zero-voltage vector of an inverter. That is, the power converter 250
Performs transmission and reception of power to and from the AC load circuit 350 and transmission and reception of zero-phase power to and from the zero-phase power supply device 150 by time division;
When the zero-phase power is exchanged with zero-phase power supply device 150, the inverter in power converter 250 performs part or all of the operation of the converter that performs the power conversion operation with zero-phase power supply 150. Execute As a result, the power converter 2
It is possible to reduce the number of arms including semiconductor switching elements and diodes in 50. Further, as a reactor on the input side required in power converter 250, a reactor included in AC load circuit 350, such as a leakage reactance of an AC motor, can be used. For this reason, the dedicated input reactor can be omitted, which can contribute to downsizing of the device.

Each of the following inventions further embodies the invention described in claim 1 and is applied to a single-phase to multi-phase power conversion circuit or a DC-multi-phase power conversion circuit. First, a second aspect of the present invention relates to a single-phase to multi-phase power conversion circuit, which converts a single-phase AC voltage into a multi-phase AC voltage by a voltage-type inverter in a power converter to drive a multi-phase AC motor. An output power conversion circuit is assumed. The feature of the invention described in claim 2 is that in the multi-phase output power conversion circuit,
A semiconductor switching element having one end of a single-phase AC power supply connected to a neutral point of a star-connected stator winding of a motor and the other end of the single-phase AC power supply connected in series to two inverters on the DC side. And connected to the midpoint of the converter consisting of, so that the voltage and current of the single-phase AC power supply become zero-phase components when viewed from the AC output side of the inverter via the motor,
By the time division, the inverter transfers power to and from the electric motor, and the inverter and the converter transfer zero-phase power to and from the single-phase AC power supply when the inverter outputs a zero-voltage vector.

According to a third aspect of the present invention, the converter according to the second aspect of the present invention is configured by a series circuit of two diodes. According to a fourth aspect of the present invention, the converter according to the second aspect of the present invention is configured by a series circuit of two capacitors.

Further, the invention according to claim 5 relates to a DC-polyphase power conversion circuit, which converts a DC voltage into a polyphase AC voltage by a voltage type inverter in a power converter to drive a polyphase AC motor. An output power conversion circuit is assumed. The feature is that in the multi-phase output power conversion circuit, one end of the DC power supply is connected to the neutral point of the star-connected stator winding of the motor, and the other end of the DC power supply is paralleled to the DC side of the inverter. It is connected to one of the connection points of the connected smoothing capacitor and the inverter so that the voltage and current of the DC power supply become zero-phase components when viewed from the AC output side of the inverter via the motor, and By the division, the inverter transmits and receives power to and from the electric motor, and transmits and receives zero-phase power to and from the DC power supply when the inverter outputs a zero-voltage vector.

According to a sixth aspect of the present invention, a combination of a single-phase or multi-phase AC power supply and a rectifier circuit is used in place of the DC power supply according to the fifth aspect of the present invention.

In any one of the second to sixth aspects of the present invention, as described in the seventh aspect, a reactor is inserted between the neutral point of the electric motor and the power source, and the reactor has an iron core. A stator iron core of an electric motor may be used. Further, in any one of the inventions described in claims 2 to 6, as described in claim 8, an AC load having no neutral point is connected to the polyphase output side of the inverter instead of the motor, and Alternatively, a neutral point of the reactor star-connected to the multiphase output side may be connected to one end of a power supply or a rectifier circuit.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. First, FIG. 2 is a circuit diagram showing an embodiment of the present invention. In the figure, similarly to the above, 202 is a smoothing capacitor, 203 is a three-phase voltage source inverter composed of self-extinguishing semiconductor switching elements Tr1 to Tr6 such as IGBTs and diodes anti-parallel to each switching element, and 204 is self-extinguishing. An upper and lower one-arm converter comprising semiconductor switching elements Tr7 and Tr8 and a diode antiparallel to each switching element;
301 is a three-phase induction motor in which the stator windings are star-connected,
101 is connected at one end to the neutral point of the induction motor 301,
The other end is a switching element Tr7, T of the converter 204.
This is a single-phase AC power supply connected to the middle point (virtual neutral point) of r8.

In this embodiment, a three-phase voltage source inverter 20
3 focuses on the zero voltage vector. That is,
In the three-phase voltage source inverter 203, there are two types of switching patterns for outputting a zero voltage vector, that is, a case where all upper arms are made conductive and a case where all lower arms are made conductive. In the present embodiment, this degree of freedom is used. .
Since the zero-phase voltage output from the inverter 203 does not appear in the line voltage, it does not affect the motor drive. Therefore,
The equivalent circuit for the positive phase is as shown in FIG. 3, and the motor 301 operates as the same inverter as the conventional one, and the electric power between the inverter 301 and the motor 301 is controlled by controlling the power by the line voltage of the inverter 203 and the current flowing between the lines. To exchange AC power.

On the other hand, when considering the zero-phase component, it becomes as shown in FIG. 4, and the three arms of the inverter 203 in FIG. 3 can be regarded as one arm 203 'that performs switching operation at the ratio of the zero voltage vector. That is, FIG.
One arm of the conventional converter 201 shown in FIG. 2 can be substituted by controlling the zero-phase voltage by the inverter 203 in FIG. The electric motor 301 can be considered as a reactor 302 having a value of leakage inductance. Then, as shown in FIG.
Are added separately, so that these arms 203 ′,
It can be seen that a circuit configuration equivalent to the converter 201 of FIG. 20 is realized by 204 and a similar power conversion operation is performed. That is, the converter including the arms 203 ′ and 204 in FIG.
A zero-phase power is exchanged with the 01. Therefore, the single-phase to multi-phase power conversion circuit substantially similar to that of FIG. 20 can be realized by the circuit shown in FIG. 2, so that the number of semiconductor switching elements, diodes and the like can be reduced and the input side reactor of the converter can be reduced. Omission simplifies the circuit configuration, reduces size,
Cost reduction becomes possible. Note that the electric motor as the AC load may be a polyphase AC motor other than the three-phase induction motor.

The inverter 203 and the converter 204 in FIG. 2 are both PWM controlled.
The pulse is created by, for example, the control circuit shown in FIG. That is, in FIG. 5, the deviation between the DC voltage command V dc * and the DC voltage detection value V dc is input to the voltage controller 404,
The output has a sine wave sin having the same phase as the power supply voltage and a magnitude of 1.
zero-phase multiplied by the ω s t (input) to obtain a current command i 0 *. Also,
Zero-phase current command i 0 * multiplied by 1/3 by multiplier 405
A current command for driving the motor 301 i a *, i b * ,
It is added to ic * to create each phase current command iu * , iv * , iw * . The deviation between these and the actual phase current detection values i u , i v , i w is obtained, input to current controllers 401 to 403, and their outputs are compared with triangular waves by comparators 406 to 408. A PWM pattern is obtained for the switching elements Tr1 to Tr6 of the inverter 203 so as to follow the commands i u * , i v * , i w * .

At this time, the converter 204
A zero-phase voltage is obtained from the sum of the voltage commands (outputs of the current controllers 401 to 403) of the respective phases with respect to the inverter 203, and this is compared with a triangular wave by the comparator 409 to obtain a PWM pattern for the switching elements Tr7 and Tr8. That is, in this embodiment, by controlling the inverter 203 and the converter 204 in a time division manner by PWM pulses, the three-phase voltage source inverter of FIG.
The former is the control of the line voltage and the current flowing between the lines by the positive-phase current, and the latter is the input of the single-phase AC power supply 101 by the zero-phase current. It controls the current.

FIG. 6 shows another example of the control circuit. Current command of the motor 301 in the example of FIG. 5 i a *, i b * , i
The PWM pulse was obtained from c * , but as shown in FIG.
01 voltage application instruction to v a *, v b *, it is also possible to determine the PWM pulses from v c *. In this case, a deviation between the zero-phase current command i 0 * and the zero-phase current i 0 obtained from each phase current is input to the current controller 410 to obtain a zero-phase voltage command v 0 * , which is referred to as a voltage command v a *, v b *, v the result of adding the c * compared with the triangular wave by the comparator 406-408, PW to the switching element Tr1~Tr6 inverter 203
Obtain the M pattern. In the converter 204, the comparator 409 compares the zero-phase voltage command v 0 * with a triangular wave to obtain a PWM pattern for the switching elements Tr7 and Tr8.

FIG. 7 is a circuit diagram showing an embodiment of the invention described in claim 3. In this embodiment, the converter 205 is configured by a series circuit of two diodes D1 and D2, and the midpoint thereof is connected to one end of the single-phase AC power supply 101. Other configurations are the same as those in FIG. According to this embodiment, the configuration of converter 205 can be simplified as compared with FIG.
It is impossible to regenerate electric power from the power supply to the single-phase AC power supply 101. The operation of the present embodiment is also substantially the same as that of the embodiment of FIG. 2, and the three-phase voltage-source inverter of FIG. 3 and the mixed-bridge single-phase converter comprising one arm thereof and the converter 205 of FIG. The operation is performed. The former controls the line voltage and the current flowing between the lines by the positive-phase current, and the latter controls the input current of the single-phase AC power supply 101 by the zero-phase current.

FIG. 8 is a circuit diagram showing an embodiment of the invention described in claim 4. In this embodiment, the converter 206 includes two capacitors C1 and C2 as passive elements.
And the middle point is a single-phase AC power supply 1
01 is connected to one end. According to this embodiment,
The configuration of converter 206 is further simplified than in FIG. Also, the regeneration of electric power from the electric motor 301 to the single-phase AC power supply 101 becomes possible, but the maximum output voltage is the difference between half of the DC voltage of the smoothing capacitor 202 and the maximum value of the AC power supply voltage. The operation of the present embodiment is obtained by overlapping the three-phase voltage source inverter of FIG. 3 with a half-bridge type single-phase converter using one arm.

Although not shown here, FIGS. 2, 7 and 8
In each of the embodiments, as described in claim 7, a reactor is connected between the neutral point of the electric motor 301 and the single-phase AC power supply 101, and the stator core of the electric motor 301 is used as the iron core. Can also.

FIG. 9 is a circuit diagram showing an embodiment of the present invention. This embodiment is based on the embodiment of FIG. 2 and connects a star-connected reactor 304 to each phase output terminal of the three-phase voltage source inverter 203 instead of the neutral point of the electric motor 301, The point is connected to one end of the single-phase AC power supply 101. According to this embodiment, the present invention can be applied to an AC load 303 having no neutral point, and a part of the configuration of the inverter can be partially applied similarly to the embodiment of FIG. The effect which can be shared with a converter is acquired. The overall operation and the control method of the inverter 203 and the converter 204 are the same as those in the embodiment of FIG. This embodiment is also applicable to a configuration in which the electric motor 301 is removed in each of the embodiments shown in FIGS.

Next, FIG. 10 shows an embodiment of the invention described in claim 5. In the following, the same components as those of the embodiments described above are denoted by the same reference numerals. In FIG. 10, the neutral point of the induction motor 301 is connected to the positive terminal of the DC power supply 103, and the negative terminal thereof is connected to the lower arm of the three-phase voltage source inverter 203 and the smoothing capacitor 20.
2 is connected to the connection point. With this connection configuration,
The DC power supply voltage is a zero-phase voltage when viewed from the AC output terminal of the inverter 203.

The positive-phase equivalent circuit of this embodiment is the same as that of FIG. 3 described above, and operates as a three-phase voltage-source inverter as in the prior art with respect to driving the motor. FIG. 11 shows a zero-phase equivalent circuit. That is, the three arms of the three-phase voltage source inverter 203 are regarded as one arm 203 'that performs switching operation at the ratio of the zero voltage vector, and the converter (two-quadrant chopper) shown in FIG.
The inverter 203 of FIG.
The converter 204 can be substituted by controlling the zero-phase voltage. Further, the electric motor 301 can be considered as a reactor 302 having a value of leakage inductance. Therefore, the circuit of FIG. 10 transfers zero-phase power between the DC power supply 103 and the capacitor 202 by the operation of the circuit of FIG. That is, the circuit shown in FIG. 10 can realize a DC-to-polyphase power conversion circuit similar to that of FIG. 21. The number of semiconductor switching elements and diodes is reduced, and the circuit configuration is simplified by omitting the input-side reactor of the two-quadrant chopper. Size, size, and cost can be reduced. Also in this embodiment, the motor as the AC load may be a polyphase AC motor other than the three-phase induction motor.

FIG. 12 is a control circuit diagram for obtaining a PWM pulse for the inverter 203 of the embodiment of FIG. In FIG. 12, a deviation between a DC voltage command V dc * and a DC voltage detection value V dc is input to a voltage controller 404, and a zero-phase (input) current command i 0 * is obtained from the output. The other configuration is the same as that of FIG. 5 except for a portion for obtaining a PWM pulse for converter 204 in FIG. 5, and finally, switching elements Tr1 to Tr6 of inverter 203.
Are output. With this control circuit, in the embodiment shown in FIG. 10, the three-phase voltage source inverter shown in FIG. 3 and the two-quadrant chopper shown in FIG. 11 are overlapped with each other. The latter is the control of the DC voltage by the zero-phase current.
Figure 13 shows another example of the control circuit, the voltage command v a * to be applied to the electric motor 301 in the same manner as FIG. 6, v b *, the v c * and requests the PWM pulse.

FIG. 14 shows another embodiment of the present invention. In this embodiment, the neutral point of the electric motor 301 is connected to the negative electrode of the DC power supply 103, and the positive electrode is connected to the connection point between the upper arm of the three-phase voltage source inverter 203 and the smoothing capacitor 202. The operation of this embodiment is also the same as that of FIG. 10, and is an operation in which a three-phase voltage source inverter and a two-quadrant chopper are overlapped.

FIG. 15 shows an embodiment of the invention described in claim 6. In this embodiment, a single-phase AC power supply 101 is used instead of the DC power supply 103 in the embodiment of FIG.
And a combination with a single-phase full-wave rectifier circuit 105 using a diode bridge. This power supply configuration can also be applied to the embodiment of FIG. The control circuit for the embodiment of FIG. 15 is as shown in FIG. That is, in order to make the input current sinusoidal, the voltage controller 40
4 has a sine wave sin having the same phase as the power supply voltage and a magnitude of 1.
the absolute value of ω s t | sinω s t | obtained by multiplying by zero-phase (input) to obtain a current command i 0 *. Others are the same as FIG. As a result, it is possible to control the DC voltage to a predetermined value while maintaining the input current as a sine wave. The embodiment of FIG. 15 is an operation in which a three-phase voltage source inverter and a single-phase one-stone sine-wave converter are overlapped.

FIG. 17 shows another embodiment of the present invention. In this embodiment, a three-phase AC power supply 1 is used instead of the DC power supply 103 in the embodiment of FIG.
-Phase full-wave rectifier circuit 10 using 07 and diode bridge
6 is used. This power supply configuration is also applicable to the embodiment of FIG. In this case, a control circuit as shown in FIG. 13 is used to make the input current a high power factor. That is, by controlling the zero-phase current i 0 to a certain constant value, the current waveform of the three-phase AC power supply 107 becomes a square wave with an electrical angle of 120 ° conduction. Therefore, there are advantages that the power factor is improved and the maximum value of the input current is smaller than in the case of a single-phase AC power supply.

Although not shown, in each of the embodiments shown in FIGS. 10, 14, 15, and 17, the neutral point of the electric motor 301 and the DC power supply (AC power supply and rectifier circuit) (Including a combination of the above), and a stator iron core of an electric motor can be used as the iron core.

FIG. 18 is a circuit diagram showing an embodiment of the invention described in claim 8. This embodiment is based on the embodiment of FIG. 10, instead of the neutral point of the electric motor 301,
A star-connected reactor 304 is connected to each phase output terminal of the three-phase voltage source inverter 203, and the neutral point is connected to the positive electrode of the DC power supply 103. This embodiment can also be applied to an AC load 303 having no neutral point.
Part of the configuration of 3 can be shared by the two-quadrant chopper. This embodiment is also applicable to the configurations in which the electric motor 301 is removed in each of the embodiments of FIGS. 14, 15, and 17.

[0037]

As described above, according to the first to sixth aspects of the present invention, since one arm of a conventional converter can be substituted by an inverter, a single-phase to multi-phase power converter or a DC-multi-phase power converter can be used. The number of semiconductor switching elements, anti-parallel diodes, and the like in the converter can be reduced, and the reactor on the input side of the power converter can be omitted, so that the circuit configuration can be simplified, the size of the device can be reduced, and the cost can be reduced. . As a result, it is possible to realize a driving device such as an electric motor that is smaller, cheaper, and has a higher input power factor than conventional ones.

According to the seventh and eighth aspects of the present invention,
Effective utilization of the stator iron core of the motor and application to an AC load having no neutral point are possible.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram showing the configuration of the invention described in claim 1;

FIG. 2 is a circuit diagram showing an embodiment of the invention described in claim 2;

FIG. 3 is a positive phase equivalent circuit of the embodiment of FIG. 2;

FIG. 4 is a zero-phase equivalent circuit of the embodiment of FIG. 2;

FIG. 5 is a control circuit diagram of the embodiment of FIG. 2;

FIG. 6 is a control circuit diagram of the embodiment of FIG. 2;

FIG. 7 is a circuit diagram showing an embodiment of the invention described in claim 3;

FIG. 8 is a circuit diagram showing an embodiment of the invention described in claim 4;

FIG. 9 is a circuit diagram showing an embodiment of the invention described in claim 8;

FIG. 10 is a circuit diagram showing an embodiment of the invention described in claim 5;

11 is a zero-phase equivalent circuit of the embodiment of FIG. 10;

FIG. 12 is a control circuit diagram of the embodiment of FIG.

FIG. 13 is a control circuit diagram of the embodiment of FIG.

FIG. 14 is a circuit diagram showing another embodiment of the invention described in claim 5.

FIG. 15 is a circuit diagram showing an embodiment of the invention described in claim 6;

FIG. 16 is a control circuit diagram of the embodiment of FIG.

FIG. 17 is a circuit diagram showing another embodiment of the invention described in claim 6;

FIG. 18 is a circuit diagram showing an embodiment of the invention described in claim 8;

FIG. 19 is a diagram conceptually showing a conventional technique.

FIG. 20 is a circuit diagram showing a conventional technique.

FIG. 21 is a circuit diagram showing a conventional technique.

FIG. 22 is a circuit diagram showing a conventional technique.

[Explanation of symbols]

 150 Zero-phase power supply device 250 Power converter 350 AC load circuit 101 Single-phase AC power supply 103 DC power supply 105, 106 Full-wave rectifier circuit 107 Three-phase AC power supply 202 Smoothing capacitor 203 Three-phase voltage source inverter 203 'arm 204-206 Converter 301 Three-phase induction motor 302, 304 Reactor 303 AC load 401-403, 410 Current controller 404 Voltage controller 405 Multiplier 406-409 Comparator Tr1-Tr8 Self-extinguishing type semiconductor switching element D1, D2 Diode C1, C2 Capacitor

Claims (8)

[Claims]
1. A power converter for converting a power by operation of a semiconductor switching element to output a polyphase alternating current, an AC load circuit connected to an output side of the power converter, and connected to the AC load circuit. A power converter and an AC load circuit so that the voltage and current of the zero-phase power device become zero-phase components when viewed from the AC output side of the power converter through the AC load circuit. And a zero-phase power supply connected in a loop, and the power converter transfers power to and from the AC load circuit and transfers zero-phase power to and from the zero-phase power supply by time division. A multi-phase output power conversion circuit characterized by the following.
2. A multi-phase output power conversion circuit for driving a poly-phase AC motor by converting the single-phase AC voltage into a poly-phase AC voltage by a voltage source inverter in a power converter, wherein one end of the single-phase AC power supply is connected to the motor. And the other end of the single-phase AC power supply is connected to the midpoint of a converter consisting of two semiconductor switching elements connected in series to the DC side of the inverter. Then, the voltage and current of the single-phase AC power supply are configured to be zero-phase components when viewed from the AC output side of the inverter via the motor, and the inverter divides power between the motor and the motor by time division. A multi-phase output power conversion circuit, wherein the inverter and the converter exchange zero-phase power with a single-phase AC power supply when the inverter outputs a zero-voltage vector.
3. A multi-phase output power conversion circuit for driving a poly-phase AC motor by converting the single-phase AC voltage into a poly-phase AC voltage by a voltage source inverter in a power converter, wherein one end of the single-phase AC power supply is connected to the motor. And the other end of the single-phase AC power supply is connected to the midpoint of a converter consisting of two diodes connected in series to the DC side of the inverter. , The voltage and current of the single-phase AC power supply are configured to be zero-phase components when viewed from the AC output side of the inverter via the motor, and the inverter transfers power to and from the motor by time division. A multi-phase output power conversion circuit, wherein the inverter and the converter exchange zero-phase power with a single-phase AC power supply when the inverter outputs a zero-voltage vector.
4. A multi-phase output power conversion circuit for driving a poly-phase AC motor by converting a single-phase AC voltage to a poly-phase AC voltage by a voltage source inverter in a power converter, wherein one end of the single-phase AC power supply is connected to the motor. And the other end of the single-phase AC power supply is connected to the neutral point of a converter consisting of two capacitors connected in series to the DC side of the inverter. The voltage and current of the single-phase AC power supply are configured to be zero-phase when viewed from the AC output side of the inverter via the motor, and the inverter transfers power to and from the motor by time division. A multi-phase output power conversion circuit, wherein the inverter and the converter exchange zero-phase power with a single-phase AC power supply when the inverter outputs a zero-voltage vector.
5. A polyphase output power conversion circuit for driving a polyphase AC motor by converting a DC voltage into a polyphase AC voltage by a voltage type inverter in a power converter, wherein one end of the DC power supply is connected to a star-shaped connection of the motor. Connected to the neutral point of the stator winding, and the other end of the DC power supply is connected to one of the connection points of the inverter and the smoothing capacitor connected in parallel to the DC side of the inverter, the voltage of the DC power supply and The inverter is configured so that the current is zero-phase when viewed from the AC output side of the inverter via the motor. A multi-phase output power conversion circuit for transmitting and receiving zero-phase power to and from a DC power supply at the time of output.
6. A multi-phase output power conversion circuit for driving a poly-phase AC motor by converting a DC voltage obtained by rectifying an AC power supply into a poly-phase AC voltage by a voltage source inverter in a power converter. One end of the rectifier circuit connected to the inverter is connected to the neutral point of the star-connected stator winding of the motor, and the other end of the rectifier circuit is connected to the smoothing capacitor and the inverter connected in parallel to the DC side of the inverter. It is connected to one of the connection points so that the voltage and current of the AC power supply become zero-phase components when viewed from the AC output side of the inverter via the motor. A multi-phase output power conversion circuit for transmitting and receiving power between the AC power supply and a zero-phase vector when the inverter outputs a zero-voltage vector.
7. A multi-phase output power conversion circuit according to claim 2, wherein a reactor is inserted between a neutral point of the motor and a power source, and the reactor is provided with an iron core as a core of the reactor. A multiphase output power conversion circuit characterized by using a stator iron core.
8. The multi-phase output power conversion circuit according to claim 2, wherein an AC load having no neutral point is connected to the multi-phase output side of the inverter instead of the motor. A multi-phase output power conversion circuit, wherein a neutral point of the star-connected reactor on the multi-phase output side is connected to one end of a power supply or a rectifier circuit.
JP14502397A 1997-06-03 1997-06-03 Multi-phase output power conversion circuit Expired - Fee Related JP3223842B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14502397A JP3223842B2 (en) 1997-06-03 1997-06-03 Multi-phase output power conversion circuit

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP14502397A JP3223842B2 (en) 1997-06-03 1997-06-03 Multi-phase output power conversion circuit
DE19823917A DE19823917A1 (en) 1997-06-03 1998-05-28 Converter for producing multiphase AC current
KR1019980020190A KR100533201B1 (en) 1997-06-03 1998-06-01 Power conversion apparatus
CN98117254A CN1088282C (en) 1997-06-03 1998-06-03 Power conversion apparatus
US09/089,724 US6137704A (en) 1997-06-03 1998-06-03 Power conversion apparatus utilizing zero-phase power supply device that provides zero-phase sequence components
US09/665,490 US6320775B1 (en) 1997-06-03 2000-09-20 Power conversion apparatus utilizing zero-phase power supply device that provides zero-phase sequence components

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