JP5316766B2 - Power conversion device and power supply system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power conversion device which converts an AC electric power supplied from power sources of a plurality of phases and supplies the electric power to a load of a plurality of phases stably and which is miniaturized, and to provide a power supply system. <P>SOLUTION: The power conversion device 101 lies in the power supply system 201 in which the neutral point NP1 of the power sources EU, EV, EW of a plurality of phases and the neutral point NP2 of the loads LA, LB, LC of a plurality of phases are connected to a common stable potential SP. The conversion device also includes a matrix converter MX, which converts the AC electric power of each phase supplied from the power sources EU, EV, EW for electric power supply to each of the loads LA, LB, LC, and filters FLX1, FLY1, which are provided at least between each power source and the matrix converter MX or between the matrix converter MX and each load and which suppresses the transmission of normal-mode noise and common-mode noise of a predetermined frequency or more in the received AC electric power to each load. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a power conversion device and a power supply system, and more particularly to a power conversion device and a power supply system that convert AC power of each phase supplied from each of a plurality of phase power supplies and supply the converted AC power to a plurality of loads.

  A power supply system that generates a plurality of phases of AC voltage or current having an arbitrary frequency and an arbitrary amplitude from a plurality of phases of AC power with varying frequency and amplitude has been developed.

  In such a power supply system, the following AC-DC-AC indirect conversion method is generally employed. That is, AC power from an AC power source is converted into DC power by a rectifier using a semiconductor switch, and a stable voltage or current is generated. As a result, energy is accumulated in the direct current portion. Energy, that is, electric power from the direct current section is converted into an alternating voltage or alternating current having an arbitrary frequency and an arbitrary amplitude by an inverter.

  As a power conversion device that employs such an AC-DC-AC indirect conversion method, for example, Patent Document 1 discloses the following configuration. That is, in a constant frequency power source including an AC generator driven by an engine, a rectifier circuit, and an inverter, three sets of DC power sources obtained by rectifying the output of the AC generator with the neutral point connected to the ground It is converted into a neutral point grounding type three-phase four-wire AC power source by a single-phase inverter. Three sets of single-phase inverters are controlled so that each phase output of the three-phase four-wire AC power supply satisfies a predetermined specification.

  In addition, as a power conversion device that employs an AC-DC-AC indirect conversion method, for example, Patent Document 2 discloses the following configuration. That is, a noise filter used in a motor drive device including a rectifying unit that rectifies an AC power source to convert it into a DC voltage, and an inverter that converts the converted DC voltage into AC by controlling the conductivity of the switching element. The input side noise filter of the motor driving device and the output side noise filter of the motor driving device are integrated. The input side noise filter is a noise terminal voltage reduction filter, and the output side noise filter is a common mode current reduction filter. The noise terminal voltage reduction filter includes a common mode choke coil connected in series between the AC power supply and the motor drive device, and a capacitor connected in parallel between the input unit of the motor drive device and the common line. . The output side noise filter includes a common mode choke coil connected in series between the output part of the motor drive device and the motor, a capacitor connected in parallel between the motor and the common wire, and a common mode choke coil. And a resistor connected in parallel. The common mode choke coil of the input side noise filter and the common mode choke coil of the output side noise filter are provided on the common core. The neutral point of the AC power supply is grounded, and the motor frame is grounded.

  Incidentally, when the power supply system is incorporated in an aircraft or the like, it is particularly required to reduce the size of the power supply system. As a technique for reducing the size of a power supply system, an AC-AC direct conversion system is known in which the number of parts is smaller than that of an AC-DC-AC indirect conversion system (see, for example, Non-Patent Document 1). In this AC-AC direct conversion method, an AC voltage or an AC current having an arbitrary frequency and an arbitrary amplitude is generated by using a matrix converter that directly converts AC power into AC power. Since the power factor of the input current can be controlled to 1 by using the matrix converter, the power supply system can be downsized.

  As a power conversion device that employs such an AC-AC direct conversion method, for example, Patent Document 3 discloses the following configuration. That is, a passive filter comprising an input three-phase AC reactor provided on the AC power supply side of the matrix converter, an input capacitor connected in parallel to a connection point between the input three-phase AC reactor and the matrix converter, and a matrix converter And an output three-phase AC reactor provided on the output side. One end of the output three-phase AC reactor is connected to the matrix converter, and the other end is connected to the output three-phase common mode choke coil. Connect a load such as a motor to the terminal opposite to the output three-phase AC reactor of the output three-phase common mode choke coil, and output in parallel to the connection point between the output three-phase common mode choke coil and the load. Connect the capacitor. The input capacitor and the output capacitor have a star connection for each of the three phases, and the neutral points of these star connections are connected by a connection line.

Further, as a power conversion apparatus to which both the AC-DC-AC indirect conversion method and the AC-AC direct conversion method can be applied, for example, Patent Document 4 discloses the following configuration. That is, in a noise filter used in a motor drive device using a power converter represented by an inverter, a matrix converter, etc., an input side noise filter of the motor drive device and an output side noise filter of the motor drive device Integrated structure. The input side noise filter is arranged in each R, S, T phase between the common mode choke coil connected in series between the power source and the power converter, and between the common mode choke coil and the power converter. A grounding capacitor and a plurality of capacitors Y-connected between the R, S, and T phases are included. The bypass circuit portion of the output side noise filter is connected to the neutral point of each Y-connected capacitor in the input side noise filter. The neutral point of the AC power supply is grounded, and the motor frame is grounded.
JP-A-4-331470 JP 2005-130575 A JP 2005-295676 A JP 2007-68311 A Muneaki Ishida et al., “Waveform Control Method of Input Power Factor Variable Sine Wave Input / Output PWM Control Cycloconverter”, IEEJ Transactions, Vol. 107-D, No. 2, pp. 239-246, 1987

  By the way, in the power supply system that adopts the AC-AC direct conversion method, when the potential at the neutral point of the AC power supply of the plural phases is indefinite, the load connected to the power supply system may malfunction. For example, various electric components that are loads are used in aircraft, and malfunction of the electric components may lead to a serious problem. Since the indefinite potential at the neutral point cannot be estimated, it is difficult to prevent malfunction due to this indefinite potential by control.

  SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a power conversion device and a power supply system that can convert AC power supplied from a plurality of phases of power and stably supply it to a plurality of loads, and can be downsized. Is to provide.

  In order to solve the above problems, a power conversion device according to an aspect of the present invention converts AC power of each phase supplied from each of a plurality of phase power supplies, supplies each of the AC power to a plurality of loads, and A power conversion device in a power supply system in which a neutral point of a phase power supply and a neutral point of a load of a plurality of phases are coupled to a common stable potential, the AC power of each phase supplied from the power supply of the plurality of phases Included in the received AC power, provided at least one of the matrix converter that converts and supplies each of the loads to the multi-phase load, and between the multi-phase power source and the matrix converter and between the matrix converter and the multi-phase load A filter that suppresses transmission of normal mode noise and common mode noise of a predetermined frequency or higher to a load.

  With such a configuration, in addition to normal mode noise, common mode noise generated due to switching of the matrix converter and the like can be prevented from being transmitted to the load. Power can be converted and stably supplied to a plurality of loads. Moreover, by using a matrix converter, the power converter can be downsized as compared with the AC-DC-AC indirect conversion method.

  Preferably, the filter includes a plurality of single-phase reactors provided corresponding to each phase and connected between the load of the corresponding phase and the matrix converter.

  With such a configuration, since the filter has an inductance component with respect to the common mode noise transmitted from the matrix converter, the common mode noise can be prevented from being transmitted to the load.

  Preferably, the filter is provided corresponding to each phase, and includes a plurality of capacitors connected between the connection node of the matrix converter and the load of the corresponding phase and the stable potential.

  With such a configuration, since the filter has an impedance component with respect to the common mode noise transmitted from the matrix converter, the common mode noise can be prevented from being transmitted to the load.

  Preferably, the filter includes a plurality of single-phase reactors provided corresponding to each phase and connected between the power supply of the corresponding phase and the matrix converter.

  With such a configuration, since the filter has an inductance component with respect to the common mode noise transmitted from the power supply, it is possible to prevent the common mode noise from being transmitted to the load.

  Preferably, the filter includes a plurality of capacitors provided corresponding to each phase and connected between a power supply of the corresponding phase and a connection node of the matrix converter and a stable potential.

  With such a configuration, since the filter has an impedance component with respect to the common mode noise transmitted from the power supply, it is possible to prevent the common mode noise from being transmitted to the load.

  In order to solve the above problems, a power supply system according to an aspect of the present invention is a power supply system that supplies power to a plurality of loads having a neutral point coupled to a stable potential, and is coupled to the stable potential. A multi-phase power source that has a neutral point and supplies a plurality of phases of AC power, and a matrix converter that converts the AC power of each phase supplied from the plurality of phases of power and supplies each phase to a plurality of loads. Normal mode noise and common mode noise of a predetermined frequency or more included in the AC power of each phase received between at least one of the power source and the matrix converter of the plurality of phases and between the matrix converter and the loads of the plurality of phases. And a filter for suppressing transmission to the load.

  With such a configuration, in addition to normal mode noise, common mode noise generated due to switching of the matrix converter and the like can be prevented from being transmitted to the load. Power can be converted and stably supplied to a plurality of loads. Further, by using a matrix converter, it is possible to reduce the size of the power supply system as compared with the AC-DC-AC indirect conversion method.

  A power converter according to an aspect of the present invention includes a matrix converter. The advantages of the matrix converter as compared with the AC-DC-AC indirect conversion method are as follows (1) to (4).

(1) Possible to reduce size and weight Since the number of semiconductor elements inserted between the input and output of the power converter is small, the loss of semiconductor elements on the current path between the input and output can be reduced. Loss of the power conversion device can be reduced. Therefore, since the cooling component represented by the heat sink and the like can be reduced in size and weight, the power conversion device to which the matrix converter is applied can be reduced in size and weight as compared with the AC-DC-AC indirect conversion method.

  Further, it is known that the matrix converter can control the phase of the input current (see Non-Patent Document 1). Therefore, when the input current phase is controlled so as to be in phase with the input voltage, the input power factor can be made 1. Generally, the AC-DC conversion system in the AC-DC-AC indirect conversion system is roughly classified into a system using a diode rectifier and a system using a PWM rectifier. In general, a method using a diode rectifier is inexpensive, easy to configure, and highly efficient, but has a drawback that the input power factor is relatively poor. In general, a method using a PWM rectifier can realize an input power factor of 1 as in a matrix converter, but has a disadvantage that it is expensive, has a complicated configuration, and has a large loss. Yes.

  From the above, the matrix converter can realize a power factor of 1, unlike the AC-DC-AC indirect conversion method using a diode rectifier. Thereby, the capacity of the input power supply facility of the matrix converter, for example, the capacity of the input power supply and the generator can be reduced, so that the input power facility of the matrix converter can be reduced in size. Further, the matrix converter has a smaller loss than the AC-DC-AC indirect conversion method using the PWM rectifier.

The input power supply facility capacity S is generally represented by the following equation.
S [VA] = P [VA] ÷ η ÷ PF
Where P is the output power of the matrix converter, that is, the power required by the load, η is the efficiency of the matrix converter, and PF is the input power factor of the matrix converter.

  Further, since the matrix converter can set the input power factor to 1, the input current can be reduced as compared with the AC-DC-AC indirect conversion method using the diode rectifier. Thereby, since the wiring between the input power supply facility and the matrix converter can be thinned, it is possible to reduce the size and weight.

The input current I in the case of three phases is generally expressed by the following formula.
I [A] = S [VA] ÷ V [V] ÷ 3
Where V is the input voltage of the matrix converter, that is, the output voltage of the input power supply facility.

The input current I in the case of a single phase is generally represented by the following formula.
I [A] = S [VA] ÷ V [V]
In aircraft, the weight of equipment is important, and it is important to reduce the weight as much as possible. Therefore, it is preferable that the wiring is as thin as possible, and it is preferable that the power converter is as small and light as possible. .

(2) Longer life is possible Matrix converters are generally known not to have a DC section (see Non-Patent Document 1).

  On the other hand, the AC-DC-AC indirect conversion method is a method of once converting input AC power into DC power and generating arbitrary AC power again, and thus has a DC unit. In this DC section, generally, an input AC power is converted to DC power by providing an electrolytic capacitor having a large capacity.

  In general, an electrolytic capacitor has a lifetime, which is shorter than that of components constituting a power converter such as a resistor and a semiconductor element. The life of the power converter may be equated with the life of the electrolytic capacitor.

  On the other hand, since the matrix converter does not have a direct current part as described above, an electrolytic capacitor is unnecessary. Therefore, the lifetime can be extended.

  From a general point of view, it is preferable that the life of the power conversion device is long because the number of replacements of the power conversion device incorporated in the system may be reduced.

(3) There is a power regeneration function It is known that a matrix converter can generally regenerate energy generated in a load to the input side because there is no restriction on the direction of energy transmission.

  On the other hand, in the AC-DC-AC indirect conversion system to which the diode rectifier is applied, the energy transmission direction is limited to a certain direction by the diode rectifier.

  In general, in an AC-DC-AC indirect conversion method using a diode rectifier, energy generated in the load is discharged by providing a discharge resistor at the end of the load. In this case, since the energy of the load is converted into the heat of the resistor, the energy of the load is not effectively used. Furthermore, it is necessary to separately provide a discharging resistor, which hinders reduction in size and weight.

  Examples of energy generated by a load include the following. That is, in an inverter that drives a train or the like, an electric motor is driven by the inverter, and the electric train travels by the electric motor. When the train is accelerating, the amount of energy required for the acceleration is supplied to the motor via the inverter. When the train decelerates, the electric motor generates energy like a generator.

(4) Noise reduction The AC-DC-AC indirect conversion system has a direct current section as described above. In general, an inverter receives a voltage of a DC part and switches the voltage of the DC part with the semiconductor element by a semiconductor element represented by an FET (Field Effect Transistor) and an IGBT (Insulated Gate Bipolar Transistor). Modulate to arbitrarily set output voltage and output frequency.

  In this case, a rectangular wave voltage is generated in which the voltage of the direct current portion is turned on / off by switching of the semiconductor element. The maximum value of this rectangular wave voltage is ideally a DC voltage amplitude except for switching surges and the like.

  Accordingly, in the voltage fluctuation rate dv / dt, dv is larger than that of the matrix converter, and dt is substantially determined by the characteristics of the semiconductor element, so that the voltage fluctuation rate dv / dt of the semiconductor element becomes larger. Then, in order to reduce the noise generated by the fluctuation of the voltage of the semiconductor element, it is necessary to take noise countermeasures such as inserting a noise filter at various places, and the power converter becomes large and heavy.

  On the other hand, since the matrix converter does not have a direct current section as described above, when modulating to an arbitrarily set output voltage and output frequency using a semiconductor element typified by FET and IGBT, The voltage variation rate dv / dt of the semiconductor element is smaller than that of the AC-DC-AC indirect conversion method described above.

  That is, the voltage fluctuation of the semiconductor element in the AC-DC-AC indirect conversion system is switched with respect to the on-voltage (generally several V) of the semiconductor element when the semiconductor element that receives the voltage of the direct current portion is made conductive. It becomes the form which repeated on and off.

  On the other hand, since the matrix converter modulates the voltage of an arbitrary phase of the input voltage by a semiconductor element, the voltage fluctuation of the semiconductor element causes the semiconductor when the semiconductor element is electrically connected to the voltage of the arbitrary phase of the input voltage. The on-voltage of the element (generally several volts) is repeated by switching.

  For this reason, in the matrix converter, voltage fluctuation dv / dt of the semiconductor element can be suppressed as compared with the AC-DC-AC indirect conversion method, and therefore the number of noise filters to be inserted may be reduced and the size may be reduced. Therefore, the matrix converter can be reduced in size and weight as compared with the AC-DC-AC indirect conversion method.

  The power conversion device according to an aspect of the present invention preferably includes a single-phase reactor. The following points (1) to (2) show that the single-phase reactor is superior to the three-phase reactor.

(1) Non-common magnetic circuit The three-phase reactor has a common magnetic circuit as will be described later. On the other hand, in the structure which provides a single-phase reactor for every phase, since there is no magnetic coupling between single-phase reactors, there are the following excellent points. That is, in a three-phase reactor, for example, when an excessive magnetic flux is generated in one of the three phases and core saturation occurs, the core is common, so that the inductance component does not occur as designed for all three phases. There is a case. That is, the influence on the core magnetic flux generated in a certain phase also occurs in the other phases.

  In contrast, in the configuration in which a single-phase reactor is provided for each phase, since there is no magnetic coupling between the single-phase reactors, the influence on the core magnetic flux generated in the other single-phase reactors has an effect on the other single-phase reactors. Does not occur.

  Therefore, for example, when an overcurrent or the like is generated in one single-phase reactor and the core magnetic flux is saturated, the inductance value of the single-phase reactor for that phase is not an inductance value as designed. For this reason, the noise to the load cannot be suppressed as designed, but the noise can be suppressed as designed for the other phases. Thereby, it is possible to reduce the influence of noise or the like on the load with respect to an abnormality such as an overcurrent for one phase of the load.

(2) Improving the degree of freedom of installation The three-phase reactor is composed of one core and three windings, and is generally larger than other parts.

  On the other hand, a single-phase reactor is composed of a single core and a single winding for a single phase, and in the case of three phases, it is necessary to arrange three single-phase reactors. Generally, when a single-phase reactor and a three-phase reactor are designed according to the same specification, the size of the three-phase reactor is larger than one single-phase reactor. However, in general, the three-phase reactor is smaller in the volume of one three-phase reactor and the volume of three single-phase reactors.

  In general, physical restrictions are imposed on the arrangement of the reactor and the like. That is, since one single-phase reactor is smaller than one three-phase reactor, the degree of freedom in arrangement is relatively high. On the other hand, since a three-phase reactor is larger than one single-phase reactor, the place which can be arrange | positioned may be limited.

  As described above, since the three-phase reactor is configured by three reactors integrally, there are restrictions on the arrangement location due to the size and weight thereof. In contrast, a single-phase reactor is generally smaller than a three-phase reactor because one reactor is configured as one object, and has a higher degree of freedom in arrangement than a three-phase reactor.

  According to the present invention, AC power supplied from a plurality of phases of power can be converted and stably supplied to a plurality of loads, and the size can be reduced.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.

<First Embodiment>
[Power supply system 251 and power converter 151]
FIG. 1 is a diagram showing a configuration of a power supply system 251 according to the first embodiment of the present invention.

  Referring to FIG. 1, power supply system 251 includes AC power supplies EU, EV, EW, a power converter 151, and a load unit LU. Power conversion device 151 includes an input filter FLX2, an output filter FLY2, and a matrix converter MX. Input filter FLX2 includes a three-phase reactor LIT and capacitors CIU2, CIV2, and CIW2. Three-phase reactor LIT includes reactors LIU2, LIV2, and LIW2. Output filter FLY2 includes a three-phase reactor LOT and capacitors COA2, COB2, and COC2. The three-phase reactor LOT includes reactors LOA2, LOB2, and LOC2. Matrix converter MX includes bidirectional switches SA1, SA2, SA3, SB1, SB2, SB3, SC1, SC2, and SC3. The load unit LU includes loads LA, LB, and LC.

  Hereinafter, each of AC power supplies EU, EV, and EW may be referred to as AC power supply E. Each of the loads LA, LB, and LC may be referred to as a load L. Each of reactors LIU2, LIV2, and LIW2 may be referred to as reactor LI2. Each of the capacitors CIU2, CIV2, and CIW2 may be referred to as a capacitor CI2. Each of reactors LOA2, LOB2, and LOC2 may be referred to as reactor LO2. Each of the capacitors COA2, COB2, and COC2 may be referred to as a capacitor CO2.

  The power supply system 251 is mounted on an aircraft and a construction machine. In the power supply system 251, the neutral point NP1 of the AC power supplies EU, EV, and EW and the neutral point NP2 of the loads LA, LB, and LC are coupled to a common stable potential SP. Here, the stable potential is a potential at a portion where the impedance is small and the potential fluctuation is small compared to other portions in the power supply system 251, and is, for example, the frame ground of the aircraft, that is, the potential of the aircraft. Here, the body is made of a conductive material. In addition, when the power supply system 251 is incorporated in a large aircraft such as an aircraft, the distance between the neutral point NP1 and the neutral point NP2 increases, so that the neutral point NP1 and the aircraft have the minimum impedance of the connection path. It is preferable to be connected at a place. The neutral point NP2 and the aircraft are also preferably connected at a location where the impedance of the connection path is minimized.

  The power converter 151 is an AC power of A phase, B phase, and C phase having an arbitrary frequency and an arbitrary amplitude for AC power of U phase, V phase, and W phase supplied from each of the AC power sources EU, EV, and EW. It converts into electric power and supplies it to load LA, LB, LC, respectively.

  The input filter FLX2 is provided between the AC power supplies EU, EV, EW and the matrix converter MX. More specifically, reactors LIU2, LIV2, and LIW2 are provided corresponding to the U-phase, V-phase, and W-phase, and are connected between AC power supply E of the corresponding phase and matrix converter MX. Capacitors CIU2, CIV2, and CIW2 are Δ-connected, that is, are connected between U-phase, V-phase, and W-phase wirings between three-phase reactor LIT and matrix converter MX, respectively.

  The output filter FLY2 is provided between the matrix converter MX and the loads LA, LB, LC. Reactors LOA2, LOB2, and LOC2 are provided corresponding to the A phase, the B phase, and the C phase, and are connected between the load L of the corresponding phase and the matrix converter MX. Capacitors COA2, COB2, and COC2 are Δ-connected, that is, connected between the A-phase, B-phase, and C-phase wirings between the three-phase reactor LOT and the load L, respectively.

  In the matrix converter MX, the bidirectional switch SA1 is connected between the reactor LIU2 and the reactor LOA2. Bidirectional switch SA2 is connected between reactor LIV2 and reactor LOA2. Bidirectional switch SA3 is connected between reactor LIW2 and reactor LOA2. The bidirectional switch SB1 is connected between the reactor LIU2 and the reactor LOB2. The bidirectional switch SB2 is connected between the reactor LIV2 and the reactor LOB2. The bidirectional switch SB3 is connected between the reactor LIW2 and the reactor LOB2. Bidirectional switch SC1 is connected between reactor LIU2 and reactor LOC2. Bidirectional switch SC2 is connected between reactor LIV2 and reactor LOC2. Bidirectional switch SC3 is connected between reactor LIW2 and reactor LOC2.

  Each of the bidirectional switches SA1, SA2, SA3, SB1, SB2, SB3, SC1, SC2, and SC3 is provided with, for example, two circuits in which an IGBT (Insulated Gate Bipolar Transistor) and a diode are connected in series, and the conduction directions of each other. These two circuits are connected in parallel so that is opposite. Alternatively, these bidirectional switches may have a configuration in which two reverse blocking IGBTs having reverse withstand voltage performance are connected in parallel so that their conduction directions are opposite to each other.

  Input filter FLX2 attenuates normal mode noise of a predetermined frequency or higher included in U-phase, V-phase, and W-phase AC power received from AC power sources EU, EV, and EW, respectively, and converts the attenuated AC power to matrix converter MX. Output to.

  Matrix converter MX turns on / off bidirectional switches SA1, SA2, SA3, SB1, SB2, SB3, SC1, SC2, and SC3 based on a control signal received from outside, thereby passing U through the input filter FLX2. The AC power of the phase, V phase, and W phase is converted into AC power of A phase, B phase, and C phase having an arbitrary frequency and arbitrary voltage / current amplitude, and is output to the output filter FLY2.

  The output filter FLY2 attenuates normal mode noise of a predetermined frequency or more included in the A-phase, B-phase, and C-phase AC power received from the matrix converter MX, and the attenuated AC power is supplied to the loads LA, LB, and LC, respectively. Output.

  Here, the frequency of noise attenuated by the input filter FLX2 and the output filter FLY2 is appropriately changed according to the specifications of the power supply system 251, and is a frequency higher than the frequency of the AC power to be supplied to the loads LA, LB, LC, for example. .

  FIG. 2 is a diagram showing a configuration of a three-phase reactor in the power conversion device 151 according to the first embodiment of the present invention.

  Referring to FIG. 2, three-phase reactor LIT includes cores MC1, MC2 and winding portions WU, WV, WW. Winding portions WU, WV, WW and corresponding core portions correspond to reactors LIU2, LIV2, and LIW2, respectively.

  The cores MC1 and MC2 are E-shaped, and the end portion of the core MC1, the end portion of the core MC2, and the gap between the end portion of the core MC1 and the end portion of the core MC2 are formed in the winding portions WU, WV, and WW, respectively. Covered. The three-phase reactor LIT may have a configuration in which the end of the core MC1 and the end of the core MC2 are in contact with each other and no gap is present.

  FIG. 3 is a diagram showing another configuration of the three-phase reactor in the power conversion device 151 according to the first embodiment of the present invention.

  Referring to FIG. 3, three-phase reactor LIT includes cores MC1 and MC2 and winding portions WU, WV and WW. Winding portions WU, WV, WW and corresponding core portions correspond to reactors LIU2, LIV2, and LIW2, respectively.

  The core MC1 is E type, and the core MC2 is I type. The vicinity of the end of the core MC1 is covered with the winding portions WU, WV, WW, respectively. The three-phase reactor LIT may be configured such that the end of the core MC1 and the core MC2 are in contact with each other and no gap is present.

  FIG. 4 is a diagram showing another configuration of the three-phase reactor in the power conversion device 151 according to the first embodiment of the present invention.

  Referring to FIG. 4, three-phase reactor LIT includes I-type cores MC1, MC2, MCU1, MCU2, MCV1, MCV2, MCW1, and MCW2, and winding portions WU, WV, and WW. Winding portion WU, corresponding portions of cores MC1 and MC2, and cores MCU1 and MCU2 correspond to reactor LIU2. Winding portion WV, corresponding portions of cores MC1 and MC2, and cores MCV1 and MCV2 correspond to reactor LIV2. Winding portion WW, corresponding portions of cores MC1 and MC2, and cores MCW1 and MCW2 correspond to reactor LIW2.

  The winding part WU covers the end of the core MCU1, the end of the core MCU2, and the gap between the end of the core MCU1 and the end of the core MCU2. The end portion of the core MCV1, the end portion of the core MCV2, and the gap between the end portion of the core MCV1 and the end portion of the core MCV2 are covered with the winding portion WV. The end portion of the core MCW1, the end portion of the core MCW2, and the gap between the end portion of the core MCW1 and the end portion of the core MCW2 are covered with the winding portion WW. The three-phase reactor LIT may have a configuration in which each core is in contact and no gap exists.

  Since the configuration of three-phase reactor LOT is the same as that of three-phase reactor LIT, detailed description will not be repeated here.

  In the power supply system 251, the neutral point NP1 of the AC power supplies EU, EV, EW and the neutral point NP2 of the loads LA, LB, LC are coupled to a common stable potential SP. With such a configuration, it is possible to prevent the potentials of the AC power supplies EU, EV, and EW from becoming indefinite, and thus it is possible to prevent malfunctions of the loads LA, LB, and LC.

  In addition, when the amounts of power to be supplied to the loads LA, LB, and LC are different from each other, when a single-phase load is further connected to any one of the loads LA, LB, and LC in a balanced state, and the loads LA, LB, and LC When the amounts of power to be supplied to the single-phase loads connected to the two are different, the three-phase load amount of the load unit LU becomes unbalanced. However, in the power supply system 251, such an unbalanced current can flow from the neutral point NP2 of the loads LA, LB, LC to the neutral point NP1 of the AC power supplies EU, EV, EW.

[Problems of power supply system 251 and power converter 151]
On the other hand, when the neutral point NP1 of the AC power sources EU, EV, EW and the neutral point NP2 of the loads LA, LB, LC are connected to the stable potential SP, the AC power of each phase from the AC power sources EU, EV, EW Balance, unbalance of output voltage of each phase from input filter FLX2, unbalance of duty of pulse controlling each switch of matrix converter MX, and unbalance of AC power of each phase supplied to loads LA, LB, LC Thus, a current flows between the neutral point NP2 of the loads LA, LB, and LC and the neutral point NP1 of the AC power sources EU, EV, and EW. Then, due to the difference in the ripple voltage of each phase generated by the switching of each switch of the matrix converter MX, between the neutral point NP2 of the loads LA, LB, LC and the neutral point NP1 of the AC power sources EU, EV, EW. A high-frequency current having a switching frequency component flows. That is, a high frequency current flows between the neutral point NP2 and the neutral point NP1, and this high frequency current generates common mode noise.

  In the embodiment of the present invention, the common mode noise means noise having the same current or voltage direction at a certain timing in each circuit of the U phase, V phase, and W phase in the power supply system. Since the current of each phase, which is common mode noise, does not cancel out at the neutral point NP2 of the loads LA, LB, LC, current flows through the neutral points NP2 and NP1 due to the common mode noise. On the other hand, normal mode noise means a current that cancels out at the neutral point NP2 of the loads LA, LB, and LC.

  FIG. 5 is a waveform diagram showing a sine wave current flowing through the three-phase reactor in the power conversion device 151. FIG. 5 shows the normalized current waveform.

  6 is a diagram showing the direction of current in the three-phase reactor shown in FIG. 2 when the sine wave current shown in FIG. 5 flows.

  Hereinafter, for the three reactors LIU2, LIV2, and LIW2 in the three-phase reactor LIT, the number of winding portions WU, WV, and WW is the same, the winding direction is the same, and the cores MC1 and MC2 are symmetrical to each other. Assume. Further, when there is a gap between the cores MC1 and MC2, it is assumed that the gap length and the magnetic, electrical and mechanical characteristics such as the permeability of the material used for the gap are the same.

  In this case, when an ideal sine wave current having a three-phase balance and no distortion as shown in FIG. 5 is passed through the three-phase reactor LIT, the amplitude of the U-phase current IU, that is, the current flowing through the winding WU at time A is The amplitude of the V-phase current IV, that is, the current that flows through the winding portion WV, and the W-phase current IW, that is, the current that flows through the winding portion WW, is −0.5. At time A, the direction of the current flowing through the winding portions WU, WV, WW is as shown in FIG.

  7 is a diagram showing the directions of current and magnetic flux in the three-phase reactor shown in FIG. 2 when the sine wave current shown in FIG. 5 flows.

  Referring to FIG. 7, when an ideal sine wave current having a three-phase equilibrium and no distortion as shown in FIG. 5 is passed through three-phase reactor LIT, the direction of magnetic flux FLU generated in reactor LIU2 at time A And the directions of magnetic fluxes FLV and FLW generated in reactors LIV2 and LIW2, respectively. For this reason, winding part WU, WV, WW has an inductance component.

FIG. 8 is a diagram showing the directions of high-frequency current and magnetic flux in the three-phase reactor.
Referring to FIG. 8, in power converter 151, as described above, a sinusoidal current including a ripple component may flow through three-phase reactor LIT due to switching of matrix converter MX or the like. That is, the high-frequency current may flow in the same direction, that is, from the reactors LIU2, LIV2, and LIW2 of the three-phase reactor LIT toward the neutral point of the three-phase reactor LIT.

  At this time, the directions of the magnetic fluxes FLU, FLV, and FLW generated in the U-phase, V-phase, and W-phase of the three-phase reactor LIT, that is, the reactors LIU2, LIV2, and LIW2, are mutually cancelled. For this reason, since the magnetic flux does not flow through the cores MC1 and MC2, the winding portions WU, WV, and WW have no inductance component with respect to the high-frequency current. Even if the amplitudes of the sinusoidal currents flowing through the reactors of the three-phase reactor LIT are different, the magnetic fluxes FLU, FLV, and FLW weaken each other, so that the inductance components of the winding portions WU, WV, and WW are reduced. The

  Therefore, the three-phase reactor LIT in the power conversion device 151 does not have an inductance component with respect to the high-frequency current in the same direction that flows due to switching of the matrix converter MX, and thus it is difficult to reduce this high-frequency current. .

  Since the three-phase reactor LOT is the same as the contents of the three-phase reactor LIT described with reference to FIGS. 5 to 8, detailed description thereof will not be repeated here.

  Furthermore, in power converter 151, capacitors CIU2, CIV2, and CIW2 connected between the U-phase, V-phase, and W-phase wirings are Δ-connected, and the neutral point of capacitors CIU2, CIV2, and CIW2 is stable. Not connected to potential SP. For this reason, the input filter FLX2 has no impedance with respect to the neutral points NP1 and NP2. In power converter 151, capacitors COA2, COB2, and COC2 connected between the A-phase, B-phase, and C-phase wirings are Δ-connected, and the neutral points of capacitors COA2, COB2, and COC2 are stable. Not connected to potential SP. For this reason, the output filter FLY2 has no impedance with respect to the neutral points NP1 and NP2.

  Therefore, capacitors CIU2, CIV2, CIW2 and capacitors COA2, COB2, COC2 in power converter 151 reduce high-frequency current flowing through neutral points NP1 and NP2, that is, common mode noise due to switching of matrix converter MX and the like. I can't. Here, a method of reducing the high-frequency current by providing a resistor between the neutral points NP1 and NP2 can be considered, but in such a configuration, the potentials of the neutral points NP1 and NP2 are unstable depending on the amplitude of the high-frequency current. Become.

  When common mode noise is applied to the input side of the AC power supplies EU, EV, and EW, distortion occurs in the AC power waveform of each phase output from the AC power supplies EU, EV, and EW, and the loads LA, LB, and LC are Defects such as malfunction will occur.

  The frequency of the current generated due to the switching of the matrix converter MX is the input / output frequency of the power converter 151, that is, the frequency of the AC power supplied from the AC power sources EU, EV, EW and the loads LA, LB, LC. It is sufficiently larger than the frequency of the supplied AC power. That is, since this high frequency current has the switching frequency of the matrix converter MX, it cannot be reduced by the switching control of the matrix converter MX.

  Further, since the power converter 151 uses the matrix converter MX, the input current is caused by the current flowing between the neutral point NP2 of the loads LA, LB, and LC and the neutral point NP1 of the AC power sources EU, EV, and EW. As a result, the input current power factor deteriorates. Then, the input power of the power converter 151 increases, and the power converter 151 may be damaged, that is, the wiring between the AC power supplies EU, EV, EW and the matrix converter MX and the circuit such as the input filter FLX2 may be burned out. .

  On the other hand, in the AC-DC-AC indirect conversion methods described in Patent Documents 1 and 2 that do not use a matrix converter, the neutral point of the AC power supply and the neutral point of the load are connected to a common stable potential, thereby connecting the neutral point of the load. Even if a high frequency current flows between the neutral point and the neutral point of the AC power supply, the common mode noise is absorbed by the capacitor in the direct current section, so that no adverse effects such as malfunction of the load occur. On the other hand, in the AC-AC direct conversion methods described in Patent Documents 3 and 4 using a matrix converter, the output fluctuation of the AC power supply is directly transmitted to the load.

  For this reason, in the AC-AC direct conversion system using a matrix converter, as can be seen from the configurations described in Patent Documents 3 and 4, it is usually necessary to connect the neutral point of the AC power supply and the neutral point of the load. Not done. In the configurations described in Patent Documents 2 and 4, the neutral point of the AC power supply is grounded and the motor frame is grounded. However, the “motor frame” is completely different from the neutral point of the load. Is.

  However, in the power supply system 201 according to the first embodiment of the present invention described below, like the power supply system 251, the neutral point NP1 of the AC power supplies EU, EV, EW and the neutrality of the loads LA, LB, LC are neutralized. By connecting the point NP2 to the stable potential SP, it is possible to prevent generation of an undefined potential at a neutral point that cannot be estimated. In addition, in addition to this, a filter that suppresses specifiable common mode noise generated by connecting the neutral point NP1 and the neutral point NP2 is provided.

[Power supply system 201 and power conversion apparatus 101]
FIG. 9 is a diagram showing a configuration of the power supply system 201 according to the first embodiment of the present invention.

  Referring to FIG. 9, power supply system 201 includes AC power supplies EU, EV, and EW, power conversion device 101, and load unit LU. Power conversion device 101 includes an input filter FLX1, an output filter FLY1, and a matrix converter MX. Input filter FLX1 includes single-phase reactors LIU1, LIV1, and LIW1, and capacitors CIU1, CIV1, and CIW1. Output filter FLY1 includes single-phase reactors LOA1, LOB1, and LOC1, and capacitors COA1, COB1, and COC1. Matrix converter MX includes bidirectional switches SA1, SA2, SA3, SB1, SB2, SB3, SC1, SC2, and SC3. The load unit LU includes loads LA, LB, and LC.

  Hereinafter, each of single-phase reactors LIU1, LIV1, and LIW1 may be referred to as single-phase reactor LI1. Each of capacitors CIU1, CIV1, and CIW1 may be referred to as capacitor CI1. Each of single-phase reactors LOA1, LOB1, and LOC1 may be referred to as single-phase reactor LO1. Each of the capacitors COA1, COB1, and COC1 may be referred to as a capacitor CO1.

  The power supply system 201 is mounted on an aircraft and a construction machine. In the power supply system 201, the neutral point NP1 of the AC power supplies EU, EV, and EW and the neutral point NP2 of the loads LA, LB, and LC are coupled to a common stable potential SP. Here, the stable potential is a potential at a portion where the impedance is small and the potential fluctuation is small compared to other portions in the power supply system 201, for example, the frame ground of the aircraft, that is, the potential of the aircraft. Here, the body is made of a conductive material. In addition, when the power supply system 201 is incorporated in a large aircraft such as an aircraft, the distance between the neutral point NP1 and the neutral point NP2 increases, so that the neutral point NP1 and the fuselage have the minimum impedance of the connection path. It is preferable to be connected at a place. The neutral point NP2 and the aircraft are also preferably connected at a location where the impedance of the connection path is minimized.

  The power conversion device 101 is an A-phase, B-phase, and C-phase AC power having an arbitrary frequency and an arbitrary amplitude for AC power of U phase, V phase, and W phase supplied from each of the AC power sources EU, EV, and EW. It converts into electric power and supplies it to load LA, LB, LC, respectively.

  The input filter FLX1 is provided between the AC power supplies EU, EV, EW and the matrix converter MX. More specifically, the single-phase reactors LIU1, LIV1, and LIW1 are provided corresponding to the U phase, the V phase, and the W phase, and are connected between the AC power supply E of the corresponding phase and the matrix converter MX. Capacitors CIU1, CIV1, and CIW1 are Y-connected, that is, provided corresponding to the U-phase, V-phase, and W-phase, and the connection node between the matrix converter MX and the corresponding single-phase reactor LI1 and the stable potential SP Connected between.

  The output filter FLY1 is provided between the matrix converter MX and the loads LA, LB, and LC. More specifically, the single-phase reactors LOA1, LOB1, and LOC1 are provided corresponding to the A phase, the B phase, and the C phase, and are connected between the load L of the corresponding phase and the matrix converter MX. Capacitors COA1, COB1, COC1 are Y-connected, that is, provided corresponding to the A phase, the B phase, and the C phase, the connection node of the matrix converter MX and the corresponding single phase reactor LO1, and the stable potential SP Connected between.

  In matrix converter MX, bidirectional switch SA1 is connected between single-phase reactor LIU1 and single-phase reactor LOA1. Bidirectional switch SA2 is connected between single-phase reactor LIV1 and single-phase reactor LOA1. Bidirectional switch SA3 is connected between single-phase reactor LIW1 and single-phase reactor LOA1. Bidirectional switch SB1 is connected between single-phase reactor LIU1 and single-phase reactor LOB1. Bidirectional switch SB2 is connected between single-phase reactor LIV1 and single-phase reactor LOB1. The bidirectional switch SB3 is connected between the single-phase reactor LIW1 and the single-phase reactor LOB1. Bidirectional switch SC1 is connected between single-phase reactor LIU1 and single-phase reactor LOC1. Bidirectional switch SC2 is connected between single-phase reactor LIV1 and single-phase reactor LOC1. Bidirectional switch SC3 is connected between single-phase reactor LIW1 and single-phase reactor LOC1.

  Input filter FLX1 attenuates normal mode noise and common mode noise of a predetermined frequency or higher included in U-phase, V-phase, and W-phase AC power received from AC power supplies EU, EV, and EW, respectively. Is output to the matrix converter MX.

  Matrix converter MX turns on and off bidirectional switches SA1, SA2, SA3, SB1, SB2, SB3, SC1, SC2, and SC3 based on control signals received from the outside, thereby passing U through the input filter FLX1. The AC power of the phase, V phase, and W phase is converted to AC power of A phase, B phase, and C phase having an arbitrary frequency and arbitrary voltage / current amplitude, and is output to the output filter FLY1.

  The output filter FLY1 attenuates normal mode noise and common mode noise of a predetermined frequency or more included in the A-phase, B-phase, and C-phase AC power received from the matrix converter MX, and the attenuated AC power is loaded to the loads LA and LB. , LC respectively.

  FIG. 10 is a diagram showing a configuration of each single-phase reactor in the power conversion device according to the first embodiment of the present invention.

  Referring to FIG. 10, single-phase reactor LOA1 includes cores MCA1 and MCA2 and winding portions WA1 and WA2. Single-phase reactor LOB1 includes cores MCB1 and MCB2 and winding portions WB1 and WB2. Single-phase reactor LOC1 includes cores MCC1 and MCC2 and winding portions WC1 and WC2.

  The cores MCA1 and MCA2 are U-shaped, and an end portion of the core MCA1, an end portion of the core MCA2, and a gap between the end portion of the core MCA1 and the end portion of the core MCA2 are formed in the winding portions WA1 and WA2, respectively. Covered. The cores MCB1 and MCB2 are U-shaped, and the end portion of the core MCB1, the end portion of the core MCB2, and the gap between the end portion of the core MCB1 and the end portion of the core MCB2 are respectively formed in the winding portions WB1 and WB2. Covered. The cores MCC1 and MCC2 are U-shaped, and the end of the core MCC1, the end of the core MCC2, and the gap between the end of the core MCC1 and the end of the core MCC2 are formed in the windings WC1 and WC2, respectively. Covered.

  Here, the core is common in the three-phase reactor LIT in the power converter 151, that is, the magnetic path is common in the reactor of each phase, but the core is separately provided in the single-phase reactors LOA1, LOB1, and LOC1 in the power converter 101. The magnetic path of each phase is separate.

  The lengths of the gaps of the single-phase reactors LOA1, LOB1, and LOC1 are, for example, several millimeters. For example, a distance of several centimeters is set so as not to receive.

  Since the configuration of single-phase reactors LIU1, LIV1, and LIW1 is similar to the configuration of single-phase reactors LOA1, LOB1, and LOC1, detailed description thereof will not be repeated here.

  In the description of the single-phase reactor including the following modifications, the single-phase reactor LOA1 will be representatively described, but the same applies to other single-phase reactors in the power converter 151.

  FIG. 11 is an equivalent circuit diagram of a single-phase reactor in the power conversion device according to the first embodiment of the present invention.

  Referring to FIG. 11, the equivalent circuit of single-phase reactor LOA1 includes an inductance generated by winding part WA1 and an inductance generated by winding part WA2.

  FIG. 12 is a diagram illustrating a case where the single-phase reactor in the power conversion device according to the first embodiment of the present invention is realized by a parallel circuit.

  In FIG. 12, a reactor having one inductance is configured by connecting two inductances shown in FIG. 11 in parallel.

  FIG. 13: is a figure which shows the case where the single phase reactor in the power converter device which concerns on the 1st Embodiment of this invention is implement | achieved with the parallel circuit.

  In FIG. 13, the reactor which has one inductance is comprised by connecting two inductances shown in FIG. 11 in series.

  FIG. 14 is a diagram showing a configuration of a modification of the single-phase reactor in the power conversion device according to the first embodiment of the present invention. FIG. 15 is an equivalent circuit diagram of the single-phase reactor shown in FIG.

  Referring to FIGS. 14 and 15, single-phase reactor LO1 may have a configuration including only one winding portion. That is, the single-phase reactor LOA1 is different from the single-phase reactor LOA1 shown in FIG. 10 and does not include the core MCA2.

  FIG. 16 is a diagram showing a configuration of a modification of the single-phase reactor in the power conversion device according to the first embodiment of the present invention.

  Referring to FIG. 16, single-phase reactor LOA1 includes I-type cores MCA1, MCA2, MCA3 and MCA4, and winding portions WA1 and WA2.

  The core MCA3 is covered with the winding part WA1 except for both ends. The core MCA4 is covered with the winding part WA2 except for both ends. The single-phase reactor LOA1 may have a configuration in which each core is in contact and no gap is present.

  FIG. 17 is a diagram illustrating a configuration of a modified example of the single-phase reactor in the power conversion device according to the first embodiment of the present invention.

  Referring to FIG. 17, single-phase reactor LOA1 includes I-type cores MCA1, MCA2, MCA3, MCA4, MCA5, MCA6, and winding portions WA1, WA2.

  A gap between the end of the core MCA3 and the end of the core MCA4 is covered with the winding part WA1. A gap between the end of the core MCA5 and the end of the core MCA6 is covered with the winding part WA2. The single-phase reactor LOA1 may have a configuration in which each core is in contact and no gap is present.

  By the way, since a three-phase reactor as shown in FIGS. 2-4 contains a common core with the reactor of each phase, it is small compared with the structure which provides a single-phase reactor for each phase. For this reason, a three-phase reactor is usually used in a circuit that handles three-phase AC power, such as the power converter 151. Here, in the power converter 151 using the three-phase reactor, a configuration in which a common mode noise filter is separately provided to attenuate common mode noise generated by switching of the matrix converter MX or the like can be considered. It becomes difficult to reduce the size.

  However, in power conversion device 101 according to the embodiment of the present invention, a single-phase reactor is used instead of a three-phase reactor. With such a configuration, even when a high-frequency current generated due to switching of the matrix converter MX flows in the same direction through each single-phase reactor, the A-phase, B-phase, and C-phase, that is, the reactors LOA1, LOB1, It is possible to prevent the magnetic fluxes generated in the LOC1 from canceling each other. Similarly, it is possible to prevent the magnetic fluxes FLU, FLV, and FLW generated in the U-phase, V-phase, and W-phase, that is, the reactors LIU1, LIV1, and LIW1, from canceling each other.

  Therefore, single-phase reactors LOA1, LOB1, and LOC1 and single-phase reactors LIU1, LIV1, and LIW1 in power conversion device 101 have inductance components for high-frequency currents in the same direction that are generated due to switching of matrix converter MX or the like. Therefore, this high frequency current can be reduced. That is, common mode noise transmitted to the load L can be reduced.

  Further, in the configurations described in Patent Documents 2 to 4, a common mode choke coil is used as a filter. However, as described in FIG. The cores are common to the phases, and the configurations are completely different from the single-phase reactors LIU1, LIV1, and LIW1 and the single-phase reactors LOA1, LOB1, and LOC1 according to the first embodiment of the present invention. Further, since the common mode choke coil has an inductance component only with respect to the common mode noise, it is necessary to add a circuit in addition to the common mode choke coil in order to reduce the normal mode noise. In contrast, single-phase reactors LIU1, LIV1, and LIW1 and single-phase reactors LOA1, LOB1, and LOC1 according to the first embodiment of the present invention have inductance components for both normal mode noise and common mode noise. Thus, the circuit can be reduced in size.

  In power converter 101, capacitors CIU1, CIV1, and CIW1 connected between the U-phase, V-phase, and W-phase wirings are Y-connected, and neutral points of capacitors CIU1, CIV1, and CIW1 are stable. Coupled to potential SP. Therefore, input filter FLX1 has an impedance with respect to neutral points NP1 and NP2.

  Similarly, in power converter 101, capacitors COA1, COB1, and COC1 connected between the A-phase, B-phase, and C-phase wirings are Y-connected, and the neutral points of capacitors COA1, COB1, and COC1 are Coupled to a stable potential SP. Therefore, output filter FLY1 has an impedance with respect to neutral points NP1 and NP2.

  Therefore, high-frequency current, that is, common mode noise transmitted to loads LA, LB, and LC can be reduced by capacitors CIU1, CIV1, and CIW1 and capacitors COA1, COB1, and COC1 in power conversion device 101.

  As described above, in the power supply system 201 according to the first embodiment of the present invention, AC power supplied from a plurality of phases of power is converted and stably supplied to a load of a plurality of phases, and downsizing is performed. Can be planned.

  Next, another embodiment of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.

<Second Embodiment>
The present embodiment relates to a power supply system in which the configuration of the input filter is changed as compared with the power supply system 201 according to the first embodiment. The contents other than those described below are the same as those of the power supply system 201 according to the first embodiment.

FIG. 18 is a diagram showing a configuration of a power supply system according to the second embodiment of the present invention.
Referring to FIG. 18, power supply system 202 includes power conversion device 102 instead of power conversion device 101 as compared with power supply system 201 according to the first embodiment of the present invention. Power conversion device 102 includes an input filter FLX3, an output filter FLY1, and a matrix converter MX. Input filter FLX3 includes a three-phase reactor LIT and capacitors CIU1, CIV1, and CIW1. Three-phase reactor LIT includes reactors LIU2, LIV2, and LIW2.

  The input filter FLX3 is provided between the AC power supplies EU, EV, EW and the matrix converter MX. More specifically, reactors LIU2, LIV2, and LIW2 are provided corresponding to the U-phase, V-phase, and W-phase, and are connected between AC power supply E of the corresponding phase and matrix converter MX. Capacitors CIU1, CIV1, and CIW1 are Y-connected, that is, provided corresponding to the U phase, V phase, and W phase, and between the connection node of matrix converter MX and reactor LI2 of the corresponding phase and stable potential SP. It is connected.

  In matrix converter MX, bidirectional switch SA1 is connected between reactor LIU2 and single-phase reactor LOA1. Bidirectional switch SA2 is connected between reactor LIV2 and single-phase reactor LOA1. Bidirectional switch SA3 is connected between reactor LIW2 and single-phase reactor LOA1. Bidirectional switch SB1 is connected between reactor LIU2 and single-phase reactor LOB1. Bidirectional switch SB2 is connected between reactor LIV2 and single-phase reactor LOB1. Bidirectional switch SB3 is connected between reactor LIW2 and single-phase reactor LOB1. Bidirectional switch SC1 is connected between reactor LIU2 and single-phase reactor LOC1. Bidirectional switch SC2 is connected between reactor LIV2 and single-phase reactor LOC1. Bidirectional switch SC3 is connected between reactor LIW2 and single-phase reactor LOC1.

  Input filter FLX3 attenuates normal mode noise and common mode noise of a predetermined frequency or more included in AC power of U phase, V phase, and W phase received from AC power supplies EU, EV, and EW, respectively, and AC power after attenuation Is output to the matrix converter MX.

  Unlike the input filter FLX1, the input filter FLX3 includes a three-phase reactor instead of a single-phase reactor. Even in such a configuration, the input filter FLX3 has impedance with respect to the neutral points NP1 and NP2 by the capacitors CIU1, CIV1, and CIW1. Therefore, the high-frequency current transmitted to the loads LA, LB, and LC, that is, common mode noise can be reduced. Further, the size can be reduced as compared with the power conversion device 101 using the input filter FLX1.

  Since other configurations and operations are the same as those of power supply system 201 according to the first embodiment, detailed description thereof will not be repeated here. Therefore, in the power supply system according to the second embodiment of the present invention, AC power supplied from a plurality of phases of power can be converted and stably supplied to a plurality of loads, and the size can be reduced. .

  Next, another embodiment of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.

<Third Embodiment>
The present embodiment relates to a power supply system in which the configuration of the input filter is changed as compared with the power supply system 201 according to the first embodiment. The contents other than those described below are the same as those of the power supply system 201 according to the first embodiment.

FIG. 19 is a diagram showing a configuration of a power supply system according to the third embodiment of the present invention.
Referring to FIG. 19, power supply system 203 includes power conversion device 103 instead of power conversion device 101 as compared with power supply system 201 according to the first embodiment of the present invention. Power conversion device 103 includes an input filter FLX2, an output filter FLY1, and a matrix converter MX.

  Unlike the power conversion device 101, the power conversion device 103 includes an input filter FLX2 instead of the input filter FLX1. Even in such a configuration, the output filter FLY1 can prevent the single-phase reactors LOA1, LOB1, LOC1 and capacitors COA1, COB1, COC1 from receiving high-frequency currents in the same direction that flow due to switching of the matrix converter MX. Since each has an inductance component and an impedance component, this high-frequency current can be reduced. That is, common mode noise transmitted to the load L can be reduced. Further, the size can be reduced as compared with the power conversion device 101 using the input filter FLX1.

  Since other configurations and operations are the same as those of power supply system 201 according to the first embodiment, detailed description thereof will not be repeated here. Therefore, in the power supply system according to the third embodiment of the present invention, AC power supplied from a plurality of phases of power can be converted and stably supplied to a plurality of loads, and the size can be reduced. .

  Next, another embodiment of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.

<Fourth embodiment>
The present embodiment relates to a power supply system in which the configuration of the input filter is changed as compared with the power supply system 201 according to the first embodiment. The contents other than those described below are the same as those of the power supply system 201 according to the first embodiment.

FIG. 20 is a diagram showing a configuration of a power supply system according to the fourth embodiment of the present invention.
Referring to FIG. 20, power supply system 204 includes power conversion device 104 instead of power conversion device 101 as compared with power supply system 201 according to the first embodiment of the present invention. Power conversion device 104 includes an input filter FLX4, an output filter FLY1, and a matrix converter MX. Input filter FLX4 includes single-phase reactors LIU1, LIV1, and LIW1, and capacitors CIU2, CIV2, and CIW2.

  The input filter FLX4 is provided between the AC power supplies EU, EV, EW and the matrix converter MX. More specifically, the single-phase reactors LIU1, LIV1, and LIW1 are provided corresponding to the U phase, the V phase, and the W phase, and are connected between the AC power supply E of the corresponding phase and the matrix converter MX. Capacitors CIU2, CIU2, and CIU2 are Δ-connected, that is, connected between U-phase, V-phase, and W-phase wirings between three-phase reactor LIT and matrix converter MX, respectively.

  Input filter FLX4 attenuates normal mode noise and common mode noise of a predetermined frequency or more included in U-phase, V-phase, and W-phase AC power received from AC power supplies EU, EV, and EW, respectively. Is output to the matrix converter MX.

  Unlike the input filter FLX1, the input filter FLX4 includes a Δ-connected capacitor instead of the Y-connected capacitor. Even in such a configuration, the input filter FLX4 has an inductance component with respect to the high-frequency current in the same direction that flows due to switching of the matrix converter MX by the single-phase reactors LIU1, LIV1, and LIW1, High frequency current can be reduced. That is, common mode noise transmitted to the load L can be reduced.

  Since other configurations and operations are the same as those of power supply system 201 according to the first embodiment, detailed description thereof will not be repeated here. Therefore, in the power supply system according to the fourth embodiment of the present invention, AC power supplied from a plurality of phases of power can be converted and stably supplied to a plurality of loads, and the size can be reduced. .

  Next, another embodiment of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.

<Fifth embodiment>
The present embodiment relates to a power supply system in which the configuration of the output filter is changed as compared with the power supply system 201 according to the first embodiment. The contents other than those described below are the same as those of the power supply system 201 according to the first embodiment.

FIG. 21 is a diagram showing a configuration of a power supply system according to the fifth embodiment of the present invention.
Referring to FIG. 21, power supply system 205 includes power conversion device 105 instead of power conversion device 101 as compared with power supply system 201 according to the first embodiment of the present invention. Power conversion device 105 includes an input filter FLX1, an output filter FLY3, and a matrix converter MX. Output filter FLY3 includes a three-phase reactor LOT and capacitors COA1, COB1, and COC1. The three-phase reactor LOT includes reactors LOA2, LOB2, and LOC2.

  The output filter FLY3 is provided between the matrix converter MX and the loads LA, LB, and LC. Reactors LOA2, LOB2, and LOC2 are provided corresponding to the A phase, the B phase, and the C phase, and are connected between the load L of the corresponding phase and the matrix converter MX. Capacitors COA1, COB1, COC1 are Y-connected, that is, provided corresponding to the A phase, the B phase, and the C phase, the connection node of the matrix converter MX and the corresponding single phase reactor LO1, and the stable potential SP Connected between.

  In matrix converter MX, bidirectional switch SA1 is connected between single-phase reactor LIU1 and reactor LOA2. Bidirectional switch SA2 is connected between single-phase reactor LIV1 and reactor LOA2. Bidirectional switch SA3 is connected between single-phase reactor LIW1 and reactor LOA2. Bidirectional switch SB1 is connected between single-phase reactor LIU1 and reactor LOB2. The bidirectional switch SB2 is connected between the single-phase reactor LIV1 and the reactor LOB2. Bidirectional switch SB3 is connected between single-phase reactor LIW1 and reactor LOB2. Bidirectional switch SC1 is connected between single-phase reactor LIU1 and reactor LOC2. Bidirectional switch SC2 is connected between single-phase reactor LIV1 and reactor LOC2. Bidirectional switch SC3 is connected between single-phase reactor LIW1 and reactor LOC2.

  The output filter FLY3 attenuates normal mode noise and common mode noise of a predetermined frequency or more included in the A-phase, B-phase, and C-phase AC power received from the matrix converter MX, and the attenuated AC power is loaded to the loads LA and LB. , LC respectively.

  Unlike the output filter FLY1, the output filter FLY3 includes a three-phase reactor instead of a single-phase reactor. Even in such a configuration, the output filter FLY3 has impedance with respect to the neutral points NP1 and NP2 by the capacitors COA1, COB1, and COC1. Therefore, the high-frequency current transmitted to the loads LA, LB, and LC, that is, common mode noise can be reduced. Further, the size can be reduced as compared with the power conversion device 101 using the output filter FLY1.

  Since other configurations and operations are the same as those of power supply system 201 according to the first embodiment, detailed description thereof will not be repeated here. Therefore, in the power supply system according to the fifth embodiment of the present invention, AC power supplied from a plurality of phases of power can be converted and stably supplied to a plurality of loads, and the size can be reduced. .

  Next, another embodiment of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.

<Sixth Embodiment>
The present embodiment relates to a power supply system in which the configuration of the output filter is changed as compared with the power supply system 201 according to the first embodiment. The contents other than those described below are the same as those of the power supply system 201 according to the first embodiment.

FIG. 22 is a diagram showing a configuration of a power supply system according to the sixth embodiment of the present invention.
Referring to FIG. 22, power supply system 206 includes power conversion device 106 instead of power conversion device 101 as compared with power supply system 201 according to the first embodiment of the present invention. Power conversion device 106 includes an input filter FLX1, an output filter FLY4, and a matrix converter MX. Output filter FLY4 includes single-phase reactors LOA1, LOB1, and LOC1, and capacitors COA2, COB2, and COC2.

  The output filter FLY4 is provided between the matrix converter MX and the loads LA, LB, LC. Single-phase reactors LOA1, LOB1, and LOC1 are provided corresponding to the A phase, the B phase, and the C phase, and are connected between the load L of the corresponding phase and the matrix converter MX. Capacitors COA2, COB2, and COC2 are Δ-connected, that is, are connected between A-phase, B-phase, and C-phase wirings between single-phase reactor LO1 and loads LA, LB, and LC, respectively.

  The output filter FLY4 attenuates normal mode noise and common mode noise of a predetermined frequency or more included in the A-phase, B-phase, and C-phase AC power received from the matrix converter MX, and the attenuated AC power is loaded to the loads LA and LB. , LC respectively.

  Unlike the output filter FLY1, the output filter FLY4 includes a Δ-connected capacitor instead of the Y-connected capacitor. Even in such a configuration, the output filter FLY4 has an inductance component for the high-frequency current in the same direction that flows due to the switching of the matrix converter MX by the single-phase reactors LOA1, LOB1, and LOC1. High frequency current can be reduced. That is, common mode noise transmitted to the load L can be reduced.

  Since other configurations and operations are the same as those of power supply system 201 according to the first embodiment, detailed description thereof will not be repeated here. Therefore, in the power supply system according to the sixth embodiment of the present invention, AC power supplied from a plurality of phases of power can be converted and stably supplied to a plurality of loads, and the size can be reduced. .

  Next, another embodiment of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.

<Seventh embodiment>
The present embodiment relates to a power supply system in which the configurations of the input filter and the output filter are changed as compared with the power supply system 201 according to the first embodiment. The contents other than those described below are the same as those of the power supply system 201 according to the first embodiment.

FIG. 23 is a diagram showing a configuration of a power supply system according to the seventh embodiment of the present invention.
23, power supply system 207 includes power conversion device 107 instead of power conversion device 101, as compared with power supply system 201 according to the first embodiment of the present invention. Power conversion device 107 includes an input filter FLX5, an output filter FLY5, and a matrix converter MX. Input filter FLX5 includes single-phase reactors LIU1, LIV1, and LIW1. Output filter FLY5 includes capacitors COA1, COB1, and COC1.

  The input filter FLX5 is provided between the AC power supplies EU, EV, EW and the matrix converter MX. More specifically, the single-phase reactors LIU1, LIV1, and LIW1 are provided corresponding to the U phase, the V phase, and the W phase, and are connected between the AC power supply E of the corresponding phase and the matrix converter MX.

  The output filter FLY5 is provided between the matrix converter MX and the loads LA, LB, LC. More specifically, capacitors COA1, COB1, and COC1 are Y-connected, that is, provided corresponding to the A phase, the B phase, and the C phase, and stable with the connection node of the matrix converter MX and the load L of the corresponding phase. It is connected between the potential SP.

  In matrix converter MX, bidirectional switch SA1 is connected between single-phase reactor LIU1 and a connection node of capacitor COA1 and load LA. Bidirectional switch SA2 is connected between single-phase reactor LIV1 and a connection node of capacitor COA1 and load LA. Bidirectional switch SA3 is connected between single-phase reactor LIW1 and a connection node of capacitor COA1 and load LA. Bidirectional switch SB1 is connected between single-phase reactor LIU1 and a connection node of capacitor COB1 and load LB. Bidirectional switch SB2 is connected between single-phase reactor LIV1 and a connection node of capacitor COB1 and load LB. Bidirectional switch SB3 is connected between single-phase reactor LIW1 and a connection node of capacitor COB1 and load LB. Bidirectional switch SC1 is connected between single-phase reactor LIU1 and a connection node of capacitor COC1 and load LC. Bidirectional switch SC2 is connected between single-phase reactor LIV1 and a connection node of capacitor COC1 and load LC. Bidirectional switch SC3 is connected between single-phase reactor LIW1 and a connection node of capacitor COC1 and load LC.

  Input filter FLX5 attenuates normal mode noise and common mode noise of a predetermined frequency or more included in U-phase, V-phase, and W-phase AC power received from AC power supplies EU, EV, and EW, respectively. Is output to the matrix converter MX.

  Matrix converter MX turns on and off bidirectional switches SA1, SA2, SA3, SB1, SB2, SB3, SC1, SC2, and SC3 based on control signals received from the outside, thereby passing U through the input filter FLX1. The AC power of the phase, V phase, and W phase is converted to AC power of A phase, B phase, and C phase having an arbitrary frequency and arbitrary voltage / current amplitude, and is output to the output filter FLY5.

  The output filter FLY5 attenuates normal mode noise and common mode noise of a predetermined frequency or more included in the A-phase, B-phase, and C-phase AC power received from the matrix converter MX, and the attenuated AC power is loaded to the loads LA and LB. , LC respectively.

  Unlike the input filter FLX1, the input filter FLX5 does not include the capacitors CIU1, CIV1, and CIW1. Even in such a configuration, the input filter FLX5 has an inductance component for the high-frequency current in the same direction that flows due to switching of the matrix converter MX by the single-phase reactors LIU1, LIV1, and LIW1, and therefore High frequency current can be reduced. That is, common mode noise transmitted to the load L can be reduced. Further, the size can be reduced as compared with the power conversion device 101 using the input filter FLX1.

  Unlike the output filter FLY1, the output filter FLY5 does not include the single-phase reactors LOA1, LOB1, and LOC1. Even in such a configuration, the output filter FLY5 has impedance with respect to the neutral points NP1 and NP2 by the capacitors COA1, COB1, and COC1. Therefore, the high-frequency current transmitted to the loads LA, LB, LC, that is, common mode noise can be reduced. Further, the size can be reduced as compared with the power conversion device 101 using the output filter FLY1.

  Since other configurations and operations are the same as those of power supply system 201 according to the first embodiment, detailed description will not be repeated here. Therefore, in the power supply system according to the seventh embodiment of the present invention, AC power supplied from a plurality of phases of power can be converted and stably supplied to a plurality of loads, and the size can be reduced. .

  Next, another embodiment of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.

<Eighth Embodiment>
The present embodiment relates to a power supply system in which the configuration of the input filter is changed as compared with the power supply system according to the seventh embodiment. The contents other than those described below are the same as those of the power supply system according to the seventh embodiment.

FIG. 24 is a diagram showing a configuration of a power supply system according to the eighth embodiment of the present invention.
Referring to FIG. 24, power supply system 208 includes power conversion device 108 instead of power conversion device 107, as compared with power supply system 207 according to the seventh embodiment of the present invention. Power conversion device 108 includes an input filter FLX6, an output filter FLY5, and a matrix converter MX. Input filter FLX6 includes a three-phase reactor LIT. Three-phase reactor LIT includes reactors LIU2, LIV2, and LIW2.

  The input filter FLX6 is provided between the AC power supplies EU, EV, EW and the matrix converter MX. More specifically, reactors LIU2, LIV2, and LIW2 are provided corresponding to the U-phase, V-phase, and W-phase, and are connected between AC power supply E of the corresponding phase and matrix converter MX.

  In matrix converter MX, bidirectional switch SA1 is connected between reactor LIU2 and a connection node of capacitor COA1 and load LA. Bidirectional switch SA2 is connected between reactor LIV2 and a connection node of capacitor COA1 and load LA. Bidirectional switch SA3 is connected to a connection node of reactor LIW2, capacitor COA1, and load LA. Bidirectional switch SB1 is connected between reactor LIU2 and a connection node of capacitor COB1 and load LB. Bidirectional switch SB2 is connected between reactor LIV2 and a connection node of capacitor COB1 and load LB. Bidirectional switch SB3 is connected between reactor LIW2 and a connection node of capacitor COB1 and load LB. Bidirectional switch SC1 is connected between reactor LIU2 and a connection node of capacitor COC1 and load LC. Bidirectional switch SC2 is connected between reactor LIV2 and a connection node of capacitor COC1 and load LC. Bidirectional switch SC3 is connected between reactor LIW2 and a connection node of capacitor COC1 and load LC.

  The input filter FLX6 attenuates normal mode noise of a predetermined frequency or more included in the U-phase, V-phase, and W-phase AC power received from the AC power sources EU, EV, and EW, respectively, and converts the attenuated AC power to the matrix converter MX. Output to.

  The output filter FLY5 attenuates normal mode noise and common mode noise of a predetermined frequency or more included in the A-phase, B-phase, and C-phase AC power received from the matrix converter MX, and the attenuated AC power is loaded to the loads LA and LB. , LC respectively.

  Unlike the input filter FLX5, the input filter FLX6 includes a three-phase reactor instead of a single-phase reactor. Even in such a configuration, the output filter FLY5 has impedance with respect to the neutral points NP1 and NP2 by the capacitors COA1, COB1, and COC1. Therefore, the high-frequency current transmitted to the loads LA, LB, and LC, that is, common mode noise can be reduced. Further, the size can be reduced as compared with the power conversion device 107 using the input filter FLX5.

  Since other configurations and operations are the same as those of the power supply system according to the seventh embodiment, detailed description thereof will not be repeated here. Therefore, in the power supply system according to the eighth embodiment of the present invention, AC power supplied from a plurality of phases of power can be converted and stably supplied to a plurality of loads, and the size can be reduced. .

  Next, another embodiment of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.

<Ninth embodiment>
The present embodiment relates to a power supply system in which the configuration of the output filter is changed as compared with the power supply system according to the seventh embodiment. The contents other than those described below are the same as those of the power supply system according to the seventh embodiment.

FIG. 25 is a diagram showing a configuration of a power supply system according to the ninth embodiment of the present invention.
Referring to FIG. 25, power supply system 209 includes power conversion device 109 instead of power conversion device 107, as compared with power supply system 207 according to the seventh embodiment of the present invention. Power conversion device 109 includes an input filter FLX5, an output filter FLY6, and a matrix converter MX. Output filter FLY6 includes capacitors COA2, COB2, and COC2.

  The output filter FLY6 is provided between the matrix converter MX and the loads LA, LB, and LC. More specifically, the capacitors COA2, COB2, and COC2 are Δ-connected, that is, connected between the A-phase, B-phase, and C-phase wirings between the matrix converter MX and the load L, respectively.

  In matrix converter MX, bidirectional switch SA1 is connected between single-phase reactor LIU1 and a connection node of capacitor COA2, capacitor COC2, and load LA. Bidirectional switch SA2 is connected between single-phase reactor LIV1 and a connection node of capacitor COA2, capacitor COC2, and load LA. Bidirectional switch SA3 is connected to a connection node of single-phase reactor LIW1, capacitor COA2, capacitor COC2, and load LA. Bidirectional switch SB1 is connected between single-phase reactor LIU1 and a connection node of capacitor COB2, capacitor COA2, and load LB. Bidirectional switch SB2 is connected between single-phase reactor LIV1 and a connection node of capacitor COB2, capacitor COA2, and load LB. Bidirectional switch SB3 is connected between single-phase reactor LIW1 and a connection node of capacitor COB2, capacitor COA2, and load LB. Bidirectional switch SC1 is connected between single-phase reactor LIU1 and a connection node of capacitor COC2, capacitor COB2, and load LC. Bidirectional switch SC2 is connected between single-phase reactor LIV1 and a connection node of capacitor COC2, capacitor COB2, and load LC. Bidirectional switch SC3 is connected between single-phase reactor LIW1 and a connection node of capacitor COC2, capacitor COB2, and load LC.

  Input filter FLX5 attenuates normal mode noise and common mode noise of a predetermined frequency or more included in U-phase, V-phase, and W-phase AC power received from AC power supplies EU, EV, and EW, respectively. Is output to the matrix converter MX.

  The output filter FLY5 attenuates normal mode noise of a predetermined frequency or more included in the A-phase, B-phase, and C-phase AC power received from the matrix converter MX, and the attenuated AC power is supplied to the loads LA, LB, and LC, respectively. Output.

  Unlike the output filter FLY5, the output filter FLY6 includes a Δ-connected capacitor instead of the Y-connected capacitor. Even in such a configuration, since the input filter FLX5 has an inductance component with respect to the high-frequency current in the same direction that flows due to switching of the matrix converter MX by the single-phase reactors LOA1, LOB1, and LOC1, this High frequency current can be reduced. That is, common mode noise transmitted to the load L can be reduced.

  Since other configurations and operations are the same as those of the power supply system according to the seventh embodiment, detailed description thereof will not be repeated here. Therefore, in the power supply system according to the ninth embodiment of the present invention, AC power supplied from a plurality of phases of power can be converted and stably supplied to a plurality of loads, and the size can be reduced. .

  Next, another embodiment of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.

<Tenth Embodiment>
The present embodiment relates to a power supply system in which the power supply is changed as compared with the power supply system 201 according to the first embodiment. The contents other than those described below are the same as those of the power supply system 201 according to the first embodiment.

  FIG. 26 is a diagram showing a configuration of a power supply system 210 according to the tenth embodiment of the present invention.

  Referring to FIG. 26, power supply system 210 includes generators MU, MV, MW, power conversion device 110, and load unit LU. The generator MU includes an AC power source EU and an inductance LIU3. The generator MV includes an AC power supply EV and an inductance LIV3. Generator MW includes an AC power supply EW and an inductance LIW3. Power conversion device 107 includes an input filter FLX7, an output filter FLY1, and a matrix converter MX. Input filter FLX7 includes capacitors CIU1, CIV1, and CIW1.

  Hereinafter, each of reactors LIU3, LIV3, and LIW3 may be referred to as reactor LI3.

  An equivalent circuit of the generator MU is represented by a series circuit of an AC power source EU and an inductance LIU3. An equivalent circuit of the generator MV is represented by a series circuit of an AC power supply EV and an inductance LIV3. An equivalent circuit of the generator MW is represented by a series circuit of an AC power source EW and an inductance LIW3.

  The power supply system 210 is mounted on an aircraft and a construction machine. In the power supply system 210, the neutral point NP1 of the generators MU, MV, and MW and the neutral point NP2 of the loads LA, LB, and LC are coupled to a common stable potential SP.

  The power conversion device 110 converts U-phase, V-phase, and W-phase AC power supplied from each of the generators MU, MV, and MW into A-phase, B-phase, and C-phase AC having an arbitrary frequency and arbitrary amplitude. It converts into electric power and supplies it to load LA, LB, LC, respectively.

  The input filter FLX7 is provided between the generators MU, MV, MW and the matrix converter MX. More specifically, capacitors CIU1, CIV1, and CIW1 are Y-connected, that is, provided corresponding to the U-phase, V-phase, and W-phase, the connection node of matrix converter MX and corresponding reactor LI3, and the stable potential Connected to SP.

  In matrix converter MX, bidirectional switch SA1 is connected between reactor LIU3 and single-phase reactor LOA1. Bidirectional switch SA2 is connected between reactor LIV3 and single-phase reactor LOA1. Bidirectional switch SA3 is connected between reactor LIW3 and single-phase reactor LOA1. Bidirectional switch SB1 is connected between reactor LIU3 and single-phase reactor LOB1. Bidirectional switch SB2 is connected between reactor LIV3 and single-phase reactor LOB1. Bidirectional switch SB3 is connected between reactor LIW3 and single-phase reactor LOB1. Bidirectional switch SC1 is connected between reactor LIU3 and single-phase reactor LOC1. Bidirectional switch SC2 is connected between reactor LIV3 and single-phase reactor LOC1. Bidirectional switch SC3 is connected between reactor LIW3 and single-phase reactor LOC1.

  The input filter FLX7 attenuates normal mode noise and common mode noise of a predetermined frequency or more included in the U-phase, V-phase, and W-phase AC power received from the generators MU, MV, and MW, respectively. Is output to the matrix converter MX.

  Unlike the input filter FLX1, the input filter FLX7 does not include the single-phase reactors LIA1, LIB1, and LIC1. Even in such a configuration, the input filter FLX7 has impedance with respect to the neutral points NP1 and NP2 by the capacitors CIA1, CIB1, and CIC1. Therefore, the high-frequency current transmitted to the loads LA, LB, and LC, that is, common mode noise can be reduced.

  Since other configurations and operations are the same as those of power supply system 201 according to the first embodiment, detailed description thereof will not be repeated here. Therefore, in the power supply system according to the tenth embodiment of the present invention, AC power supplied from a plurality of phases of power can be converted and stably supplied to a plurality of loads, and the size can be reduced. .

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is a figure which shows the structure of the power supply system 251 which concerns on the 1st Embodiment of this invention. It is a figure which shows the structure of the three-phase reactor in the power converter device 151 which concerns on the 1st Embodiment of this invention. It is a figure which shows the other structure of the three-phase reactor in the power converter device 151 which concerns on the 1st Embodiment of this invention. It is a figure which shows the other structure of the three-phase reactor in the power converter device 151 which concerns on the 1st Embodiment of this invention. It is a wave form diagram which shows the sine wave current which flows through the three-phase reactor in the power converter device 151. It is a figure which shows the direction of the electric current in the three-phase reactor shown in FIG. 2 when the sine wave current shown in FIG. 5 flows. It is a figure which shows the direction of the electric current and magnetic flux in the three-phase reactor shown in FIG. 2 when the sine wave current shown in FIG. 5 flows. It is a figure which shows the direction of the high frequency current and magnetic flux in a three-phase reactor. It is a figure which shows the structure of the power supply system 201 which concerns on the 1st Embodiment of this invention. It is a figure which shows the structure of each single phase reactor in the power converter device which concerns on the 1st Embodiment of this invention. It is an equivalent circuit diagram of the single phase reactor in the power converter device which concerns on the 1st Embodiment of this invention. It is a figure which shows the case where the single phase reactor in the power converter device which concerns on the 1st Embodiment of this invention is implement | achieved with the parallel circuit. It is a figure which shows the case where the single phase reactor in the power converter device which concerns on the 1st Embodiment of this invention is implement | achieved with the parallel circuit. It is a figure which shows the structure of the modification of the single phase reactor in the power converter device which concerns on the 1st Embodiment of this invention. It is an equivalent circuit schematic of the single phase reactor shown in FIG. It is a figure which shows the structure of the modification of the single phase reactor in the power converter device which concerns on the 1st Embodiment of this invention. It is a figure which shows the structure of the modification of the single phase reactor in the power converter device which concerns on the 1st Embodiment of this invention. It is a figure which shows the structure of the power supply system which concerns on the 2nd Embodiment of this invention. It is a figure which shows the structure of the power supply system which concerns on the 3rd Embodiment of this invention. It is a figure which shows the structure of the power supply system which concerns on the 4th Embodiment of this invention. It is a figure which shows the structure of the power supply system which concerns on the 5th Embodiment of this invention. It is a figure which shows the structure of the power supply system which concerns on the 6th Embodiment of this invention. It is a figure which shows the structure of the power supply system which concerns on the 7th Embodiment of this invention. It is a figure which shows the structure of the power supply system which concerns on the 8th Embodiment of this invention. It is a figure which shows the structure of the power supply system which concerns on the 9th Embodiment of this invention. It is a figure which shows the structure of the power supply system which concerns on the 10th Embodiment of this invention.

Explanation of symbols

  101-110,151 Power converter, 201-210, 251 Power supply system, EU, EV, EW AC power supply, LU load section, FLX1-FLX7 input filter, FLY1-FLY6 output filter, MX matrix converter, LIT, LOT Three-phase Reactor, CIU1, CIV1, CIW1, CIU2, CIV2, CIW2, COA2, COB2, COC2 capacitor, LIU2, LIV2, LIW2, LOA2, LOB2, LOC2 reactor, LIU1, LIV1, LIW1, LOA1, LOB1, LOC1 single-phase reactor, LIU3 , LIV3, LIW3 inductance, SA1, SA2, SA3, SB1, SB2, SB3, SC1, SC2, SC3 bidirectional switch, LA, LB, LC load, MC1, MC2, MC U1, MCU2, MCV1, MCV2, MCW1, MCW2, MCA1, MCA2, MCB1, MCB2, MCC1, MCC2 Core, WU, WV, WW, WA1, WA2, WB1, WB2, WC1, WC2 Winding section, MU, MV, MW generator.

Claims (6)

AC power of each phase supplied from each of a plurality of phase power supplies is converted and supplied to a plurality of loads, respectively, and a neutral point of the plurality of phase power supplies and a neutral point of the plurality of phase loads are A power converter in a power supply system coupled to a common stable potential,
A matrix converter that converts AC power of each phase supplied from the power source of the plurality of phases and supplies it to the load of the plurality of phases,
Normal mode noise and common mode noise of a predetermined frequency or more included in the received AC power, provided at least one of the plurality of phases between the power source and the matrix converter and between the matrix converter and the plurality of loads. A power converter comprising: a filter that suppresses transmission to the load. The filter is
The power conversion device according to claim 1, comprising a plurality of single-phase reactors provided corresponding to each of the phases and connected between the load of the corresponding phase and the matrix converter. The filter is
The power conversion according to claim 1, further comprising a plurality of capacitors provided corresponding to each of the phases and connected between a connection node of the load of the matrix converter and the corresponding phase and the stable potential. apparatus. The filter is
4. The power conversion device according to claim 1, comprising a plurality of single-phase reactors provided corresponding to each of the phases and connected between the power supply of the corresponding phase and the matrix converter. 5. The filter is
5. The device according to claim 1, further comprising a plurality of capacitors provided corresponding to each of the phases and connected between the power source of the corresponding phase and a connection node of the matrix converter and the stable potential. 6. Power converter. A power supply system for supplying power to a multi-phase load having a neutral point coupled to a stable potential,
A multi-phase power source having a neutral point coupled to the stable potential and supplying a plurality of phases of AC power;
A matrix converter that converts AC power of each phase supplied from the power source of the plurality of phases and supplies the AC power to the loads of the plurality of phases;
Normal mode noise of a predetermined frequency or more included in the received AC power of each phase provided between at least one of the plurality of phases of power supply and the matrix converter and between the matrix converter and the plurality of phases of load. And a filter that suppresses transmission of common mode noise to the load.

Images