WO2013077421A1 - 電力変換装置 - Google Patents
電力変換装置 Download PDFInfo
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- WO2013077421A1 WO2013077421A1 PCT/JP2012/080359 JP2012080359W WO2013077421A1 WO 2013077421 A1 WO2013077421 A1 WO 2013077421A1 JP 2012080359 W JP2012080359 W JP 2012080359W WO 2013077421 A1 WO2013077421 A1 WO 2013077421A1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/4835—Converters with outputs that each can have more than two voltages levels comprising two or more cells, each including a switchable capacitor, the capacitors having a nominal charge voltage which corresponds to a given fraction of the input voltage, and the capacitors being selectively connected in series to determine the instantaneous output voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
Definitions
- Embodiment of this invention is related with the power converter device which converts electric power mutually between alternating current and direct current
- a power converter that converts power between AC and DC is used for various purposes.
- a three-phase, two-level type has been used as a converter that converts alternating current of a power system into direct current or an inverter that converts direct current into alternating current and is used for driving a motor.
- the three-phase two-level is a method of converting between direct current and three-phase alternating current by performing switching at two levels such as on / off of six switches.
- a semiconductor element is used as a switching element that performs switching that is on / off switching.
- IGB ⁇ Insulated Gate Bipolar Transistor
- the three-phase two-level inverter can be configured with a minimum of six switching elements as described above.
- the control method for the three-phase two-level inverter is generally PWM control.
- PWM control is a method for controlling the magnitude of the output AC voltage by controlling the pulse width. For example, when the input DC voltage is Vdc, binary switching between + Vdc / 2 and ⁇ Vdc / 2 is performed at a predetermined timing for each phase. Thereby, the output waveform from the three-phase two-level inverter can be a pseudo-generated AC waveform.
- the direct current to be turned on / off becomes an extremely high voltage such as 300 kV.
- IGB ⁇ used as a switching element has a rating of about 6500V. Therefore, by using a multilevel inverter in which a large number of these are connected in series, the voltage applied to each switching element can be reduced.
- a capacitor may be used as a voltage source for switching the presence / absence of voltage output according to switching.
- a unit unit in which a DC capacitor is connected in parallel to two switching elements is configured.
- a voltage corresponding to a DC capacitor is output when one switching element is on, and a zero voltage is obtained when the other switching element is on.
- the DC capacitor which is a component of each unit unit, needs to have a constant voltage value so that it can be charged and discharged as appropriate. For this reason, it is necessary for the unit unit to constantly flow a reflux current that circulates the DC power supply. More specifically, it is necessary to provide a short circuit path for charging and discharging for each phase.
- Embodiment of this invention aims at providing a cheap and small-sized power converter device which can omit a high-cost and large-sized reactor like a buffer reactor.
- the power conversion device of the embodiment is characterized by having the following configuration.
- (1) A plurality of switching elements for converting direct current and alternating current by switching (2) a unit unit including the switching element and a capacitor (3) a unit arm including at least one unit unit (4) a pair of the unit arms A transformer with a primary winding connected to suppress the short-circuit current due to the leakage inductance component.
- the circuit diagram which shows the structural example of the power converter device of embodiment Circuit diagram showing the unit unit of FIG. Circuit diagram showing a configuration example of a power converter using a reactor A schematic diagram of one phase of FIG. The figure which shows the voltage waveform (A) of a positive unit unit, and the voltage waveform (B) of a negative unit unit. The figure which shows the voltage waveform (A) of a positive side transformer primary winding, the voltage waveform (B) of a negative side transformer primary winding, and the voltage waveform (C) of a transformer secondary winding Circuit diagram showing an example of transformer secondary winding connected in parallel in each phase Configuration diagram showing an example in which the primary and secondary windings of each phase transformer are used as a common iron core Configuration diagram showing an example using a three-phase transformer
- the present embodiment is a power conversion device that is connected between a three-phase AC system and a DC system and performs conversion between AC and DC.
- This power conversion device has unit arms 10P and 10N, which are positive and negative phase arms, for every three phases.
- the unit arms 10P and 10N are connected to an AC system via transformers 40P and 40N.
- the positive unit arm 10P and the negative unit arm 10N are N unit units C connected in series.
- the unit unit C is a chopper bridge unit converter described later.
- the chopper bridge unit converter which is the unit unit C, is obtained by connecting a leg 20 and a capacitor 30 in parallel as shown in FIG.
- two switching elements 21U and 21X having a self-extinguishing capability are connected in series.
- IGB ⁇ is used as the switching elements 21U and 21X.
- Diodes 22U and 22X are connected to the switching elements 21U and 21X in antiparallel.
- the diodes 22U and 22X are feedback diodes.
- the transformers 40P and 40N are insulating single-phase transformers having a winding ratio of 1: 1 between the primary and secondary windings.
- the transformers 40P and 40N are provided separately for the positive side and the negative side for each phase.
- the positive side of the primary secondary winding of the transformers 40P and 40N is indicated by a black dot.
- each unit arm 10P of each positive phase is connected to the positive side of the DC power source.
- the other end of each phase unit arm 10P is connected to the positive side of the primary winding of the positive side transformer 40P.
- One end of the unit arm 10N of each negative phase is connected to the negative side of the DC power supply.
- the other end of each phase unit arm 10N is connected to the positive side of the primary winding of the negative transformer 40P.
- the negative side of the primary winding of the positive transformer 40P and the negative side of the primary winding of the negative transformer 40N in each phase are connected to each other. Further, the negative side of the primary winding of the positive transformer 40P and the negative side of the primary winding of the negative transformer 40N are connected to each other among the three phases U phase, V phase, and W phase.
- the secondary winding of the positive-side transformer 40P and the secondary winding of the negative-side transformer 40N in each phase are connected in series.
- the negative side of the secondary winding of the negative-side transformer 40N is short-circuited between three phases of the U phase, the V phase, and the W phase.
- the positive side of the secondary winding of the positive side transformer 40P is connected to the AC side as a connection end of the U phase, the V phase, and the W phase.
- the primary side windings of the transformers 40P and 40N as insulating transformers serve as a path of the DC circulating current. For this reason, the rapid increase of the DC circulating current is suppressed by the leakage inductance component of the primary windings of the transformers 40P and 40N, similarly to the reactor.
- the leakage inductance component on the primary side of the transformers 40P and 40N can function as a reactor by using the above-described connection structure.
- a multi-level conversion device in which unit units C are connected in multiple stages in series is configured. Thereby, an output waveform can be brought closer to a sine wave and harmonics can be suppressed.
- FIG. 4 An AC waveform output operation according to the present embodiment will be described with reference to FIGS.
- one unit unit C is provided on the positive side and one on the negative side.
- the neutral point of the DC power supply is used as a ground point and is used as a voltage reference.
- Vu Voltage at the AC output point viewed from the ground point
- Vdc Voltage of each positive and negative of the DC power supply
- Vc Voltage of the capacitor 30 of the unit unit C
- VuP Output voltage of the unit unit C connected to the positive power supply side
- VuN Negative side
- the output voltage VuRef of the unit unit C connected to the power supply side is assumed to be an AC voltage command to be output that is calculated by the host system.
- VuP Vdc ⁇ VuRef
- FIG. 6A shows the waveform of the voltage VtrP1 of the primary winding in the positive transformer 40P.
- VuN Vdc ⁇ VuRef
- VuN Vdc ⁇ VuRef
- the output voltage Vtr2 is output.
- the average value of PowerP in one AC cycle is negative. That is, when the output voltage control as described above is performed, the capacitor voltage average value of the positive unit unit C cannot be kept constant, and the operation cannot be continued.
- the DC power supply is charged with DC through the path from the positive side to the positive unit unit C, the positive transformer 40P, the negative transformer 40N, the negative unit unit C, and the negative side of the DC power supply. Let the discharge current flow. This makes the average value of the capacitor voltage constant.
- a correction value ⁇ VfcControl for controlling the average value of the capacitor voltage to be constant is calculated by the following equation. Then, based on the correction value ⁇ VfcControl, the positive and negative unit unit output voltages VuP and VuN are corrected and output.
- the rapid increase of the DC circulating current can be suppressed using the leakage inductance on the primary side of the transformers 40P and 40N, and the average value of the capacitor voltage of the unit unit C can be controlled to be constant. Therefore, a small and low-cost power conversion device can be configured without installing a large and high-cost device such as a buffer reactor.
- This structure is particularly effective when configured as a multi-level conversion device.
- the switching elements 21U and 21X have a smaller required space than a reactor or the like, but when connecting in multiple stages, the required space increases as the number increases.
- the space for the reactor can be saved, so that an increase in size can be prevented even if the number of connected switching elements 21U and 21X increases.
- Embodiment of this invention is not limited to said form.
- the secondary windings of the transformers 40P and 40N may be connected in parallel to each other in each phase of the above embodiment. Whether to connect in series or in parallel is appropriately selected according to the connected DC system, AC system, load, and the like.
- each phase was comprised by a pair of transformer 40P, 40N.
- FIG. 8 it is also possible to adopt a configuration in which the iron cores M of the two transformers 40P and 40N are made common.
- a primary winding and a secondary winding are wound around a common iron core M for each phase.
- Two primary windings are provided on the positive side and the negative side.
- One end of the primary winding is connected to one end of the unit arm 10P in each phase.
- the end of the other primary winding is connected to one end of the unit arm 10N in each phase.
- the neutral points of the two primary windings are connected to each other.
- the negative side of the secondary winding in each phase is connected to each other between the three phases.
- the positive side of the secondary winding in each phase is connected to the AC side as a connection end of the U phase, V phase, and W phase.
- Icharge By adopting such a configuration, as indicated by Icharge in the figure, a short-circuit current flows, so that a direct current charge / discharge current of the capacitor is obtained.
- the DC magnetic fluxes generated by this DC charging / discharging current cancel each other. For this reason, the saturation magnetic flux density can be reduced, and the iron core M can be further miniaturized.
- IuP and IuN are positive and negative input currents, and IuP + IuN is an output current.
- such a transformer for each phase can be regarded as a combination of two single-phase transformers, or can be regarded as a single transformer having two primary windings.
- the secondary windings of the respective phases can also be configured to be connected in parallel.
- the transformers 40P and 40N are individually installed in three phases.
- the embodiment can be realized by a winding configuration of a three-phase transformer.
- the winding configuration of each leg of a three-phase tripod transformer is as follows.
- the three-phase transformer shown in FIG. 9 has two primary windings in each phase.
- the ends Up, Vp, Wp of one primary winding of the three-phase transformer are connected to the ends of the unit arms 10P in each phase.
- Ends Un, Vn, Wn of the other primary winding of the three-phase transformer are connected to the end of the unit arm 10N in each phase.
- the neutral points of the two primary windings in each phase of the three-phase transformer are connected to each other.
- the negative side of the secondary winding of the three-phase transformer is connected to each other between the three phases.
- Positive-side ends Us, Vs, Ws of the secondary winding in each phase of the three-phase transformer are connected to the AC side as U-phase, V-phase, and W-phase connection ends.
- the above embodiment can perform conversion from direct current to alternating current and alternating current to direct current with the same configuration. That is, the power converter of this embodiment can be configured as an inverter or a converter. Further, the AC system side of the power converter may be a ⁇ connection or a three-phase Y connection provided with a neutral point.
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Abstract
Description
(1) スイッチングにより直流と交流を変換する複数のスイッチング素子
(2) 前記スイッチング素子とコンデンサとを含む単位ユニット
(3) 前記単位ユニットを少なくとも1つ含む単位アーム
(4) 一対の前記単位アームの間に、漏れインダクタンス成分により短絡電流を抑制するように、一次巻線が接続されたトランス
[1.全体構成]
本実施形態の構成を、図1及び図2を参照して説明する。本実施形態は、三相の交流系統と直流系統との間に接続され、交流と直流との変換を行う電力変換装置である。この電力変換装置は、三相毎に、正側と負側の相アームである単位アーム10P、10Nを有している。この単位アーム10P、10Nは、トランス40P、40Nを介して交流系統に接続されている。
正側の単位アーム10P、負側の単位アーム10Nは、N個の単位ユニットCを直列に接続したものである。単位ユニットCは、後述するチョッパブリッジ単位変換器である。なお、図1は、N=2の例であるが、N≧1であればよい。
[3.単位ユニット]
単位ユニットCであるチョッパブリッジ単位変換器は、図2に示すように、レグ20とコンデンサ30を並列に接続したものである。レグ20においては、自己消弧能力を持つ2個のスイッチング素子21U、21Xが、直列に接続されている。このスイッチング素子21U、21Xとしては、たとえば、IGBТを用いる。各スイッチング素子21U、21Xには、逆並列にダイオード22U、22Xが接続されている。このダイオード22U、22Xは、フィードバックダイオードである。
トランス40P、40Nは、一次二次巻線間の巻線比1:1である絶縁用の単相トランスである。トランス40P、40Nは、各相毎に、正側と負側に分けて設けられている。なお、トランス40P、40Nの一次二次巻線における正側は、黒点で示す。
正側の各相の単位アーム10Pの一端は、それぞれ直流電源の正側に接続されている。各相の単位アーム10Pの他端は、それぞれ正側のトランス40Pの一次巻線の正側に接続されている。
[1.漏れインダクタンスの利用]
実際のトランスには、磁気漏れによる漏れ磁束が必ず存在する。この漏れ磁束は、変圧作用に寄与せずに、一次側及び二次側の巻線の漏れインダクタンスとして働く。
また、半導体素子によるスイッチングにおいては、ひずみ波が発生する。そして、このひずみ波に含まれる高調波成分が、機器に影響を与える。これに対処するため、たとえば、発生した高調波を吸収するフィルタを挿入することが考えられる。このフィルタは、一般的には、高調波成分を抑制するリアクトルやコンデンサで構成できる。
本実施形態による交流波形の出力動作を、図4~図6を用いて説明する。なお、図4では、説明の簡略化のため、正側と負側で単位ユニットCを1つずつとしている。まず、図4に示すように、直流電源の中性点を接地点として電圧基準とする。
Vu…接地点からみた交流出力点の電圧
Vdc…直流電源の正負それぞれの電圧
Vc…単位ユニットCのコンデンサ30の電圧
VuP…正側電源側に接続される単位ユニットCの出力電圧
VuN…負側電源側に接続される単位ユニットCの出力電圧
VuRef…上位のシステムで演算される出力したい交流電圧指令
とする。
(数1)
VuP=Vdc-VuRef
このVuPの電圧波形を、図5(A)に示す。また、正側のトランス40Pにおける一次巻線の電圧VtrP1の波形を、図6(A)に示す。
(数2)
Vu=Vdc-VuP=Vdc-(Vdc-VuRef)=VuRef
(数3)
VuN=Vdc-VuRef
このVuNの電圧波形を、図5(B)に示す。また、正側のトランス40Nにおける一次巻線の電圧VtrN1の波形を、図6(B)に示す。
(数4)
Vu=-Vdc+VuN=-Vdc+(Vdc―VuRef)=-VuRef
交流負荷電流をIuとすると、このIuは、正側の単位ユニットCと負側の単位ユニットCとにそれぞれ流れる。この時、正側の単位ユニットCのコンデンサ30は、以下の式で表される電力PowerPによって充放電がなされる。
PowerP=VuP×Iu=(Vdc-VuRef)×Iu
ΔVfcControl=G(s)×(VCref-VCu_AVE)
VCref…単位ユニットCのコンデンサ電圧指令値(あらかじめ設定される値)
VCu_AVE…U相正負全単位ユニットのコンデンサ電圧平均値
G(s)…制御ゲイン sはラプラス演算子 比例積分制御が適する
以上のような本実施形態によれば、直流循環電流の急増を、トランス40P、40Nの一次側の漏れインダクタンスを利用して抑制し、単位ユニットCのコンデンサ電圧の平均値を一定に制御できる。したがって、バッファリアクトルのような大型で高コストの装置を設置すること無く、小型で低コストの電力変換装置を構成することができる。
本発明の実施形態は、上記の形態には限定されない。
(1)たとえば、図7に示すように、上記の実施形態の各相において、トランス40P、40Nの二次巻線を互いに並列に接続してもよい。直列に接続するか、並列に接続するかは、接続される直流系統、交流系統、負荷等に応じて、適宜選択される。
20…レグ
21U、21X…スイッチング素子
30…コンデンサ
40P、40N…トランス
C…単位ユニット
M…鉄心
Т…絶縁トランス
Claims (7)
- スイッチングにより直流と交流を変換する複数のスイッチング素子と、
前記スイッチング素子とコンデンサとを含む単位ユニットと、
前記単位ユニットを少なくとも1つ含む単位アームと、
一対の前記単位アームの間に、漏れインダクタンス成分により短絡電流を抑制するように、一次巻線が接続されたトランスと、
を有することを特徴とする電力変換装置。 - 前記単位ユニットにおける前記スイッチング素子は、複数が直列に接続され、
前記単位ユニットにおける前記コンデンサは、前記スイッチング素子に並列に接続され、
前記単位アームにおける前記単位ユニットは、1つ若しくは複数直列に接続され、
前記一対の単位アームは、三相に対応して設けられ、
前記トランスは、各相ごとに2つ設けられた単相トランスであり、
各相における一方の単位アームの端部は、一方の単相トランスの一次巻線の正側に接続され、
各相における他方の単位アームの端部は、他方の単相トランスの一次巻線の正側に接続され、
各相における2つの単相トランスの一次巻線の負側同士は、互いに接続され、
各相における2つの単相トランスの一次巻線の負側は、三相間でも互いに接続され、
各相における2つの単相トランスの二次巻線同士は、互いに接続され、
各相における前記2つの単相トランスの二次巻線の負側は、三相間でも互いに接続されていることを特徴とする請求項1記載の電力変換装置。 - 各相における2つの単相トランスの二次巻線同士は、互いに直列に接続されていることを特徴とする請求項2記載の電力変換装置。
- 各相における2つの単相トランスの二次巻線同士は、互いに並列に接続されていることを特徴とする請求項2記載の電力変換装置。
- 各相における前記2つの単相トランスは、鉄心が共通であることを特徴とする請求項2~4のいずれか1項に記載の電力変換装置。
- 前記単位ユニットにおける前記スイッチング素子は、複数が直列に接続され、
前記単位ユニットにおける前記コンデンサは、前記スイッチング素子に並列に接続され、
前記単位アームにおける前記単位ユニットは、1つ若しくは複数直列に接続され、
前記一対の単位アームは、三相に対応して設けられ、
前記トランスは、各相ごとに、一次巻線と二次巻線とが共通の鉄心に巻回され、
各相における一次巻線は、2つ設けられ、
各相における一方の単位アームの端部は、前記トランスの一方の一次巻線に接続され、
各相における他方の単位アームの端部は、前記トランスの他方の一次巻線に接続され、
各相における前記トランスの2つの一次巻線の中性点は、互いに接続され、
各相における前記トランスの二次巻線の負側は、三相間で互いに接続されていることを特徴とする請求項1記載の電力変換装置。 - 前記単位ユニットにおける前記スイッチング素子は、複数が直列に接続され、
前記単位ユニットにおける前記コンデンサは、前記スイッチング素子に並列に接続され、
前記単位アームにおける前記単位ユニットは、1つ若しくは複数直列に接続され、
前記一対の単位アームは、三相に対応して設けられ、
前記トランスは、各相に一次巻線を2つ有する三相トランスであり、
各相における一方の単位アームの端部は、前記三相トランスの一方の一次巻線に接続され、
各相における他方の単位アームの端部は、前記三相トランスの他方の一次巻線に接続され、
各相における前記三相トランスの2つの一次巻線の中性点は、互いに接続され、
各相における前記三相トランスの二次巻線の負側は、三相間で互いに接続されていることを特徴とする請求項1記載の電力変換装置。
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BR112014012055A BR112014012055A2 (pt) | 2011-11-24 | 2012-11-22 | dispositivo de conversão de potência |
CN201280057663.6A CN103959633B (zh) | 2011-11-24 | 2012-11-22 | 电力变换装置 |
KR1020147012577A KR101633049B1 (ko) | 2011-11-24 | 2012-11-22 | 전력 변환 장치 |
EP12851310.8A EP2784925B1 (en) | 2011-11-24 | 2012-11-22 | Power conversion device |
US14/286,866 US9369065B2 (en) | 2011-11-24 | 2014-05-23 | Power conversion device |
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US (1) | US9369065B2 (ja) |
EP (1) | EP2784925B1 (ja) |
JP (1) | JP5881386B2 (ja) |
KR (1) | KR101633049B1 (ja) |
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WO2014189097A1 (ja) * | 2013-05-24 | 2014-11-27 | 株式会社 東芝 | 電力変換装置 |
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JP6099951B2 (ja) | 2012-11-29 | 2017-03-22 | 株式会社東芝 | 電力変換装置 |
JP6018934B2 (ja) * | 2013-01-25 | 2016-11-02 | 株式会社日立製作所 | 電力変換装置 |
JP6219188B2 (ja) * | 2014-02-03 | 2017-10-25 | 株式会社東芝 | 電力変換装置 |
JP6470051B2 (ja) * | 2015-01-21 | 2019-02-13 | 株式会社東芝 | 電力変換装置 |
JP5868561B1 (ja) * | 2015-04-06 | 2016-02-24 | 三菱電機株式会社 | 電力変換装置 |
JP6404768B2 (ja) * | 2015-04-24 | 2018-10-17 | 株式会社東芝 | 電力変換装置 |
WO2017081971A1 (ja) * | 2015-11-11 | 2017-05-18 | 三菱電機株式会社 | 磁気部品集合体およびこの磁気部品集合体を用いた電力変換装置 |
JP6121582B2 (ja) * | 2016-02-15 | 2017-04-26 | 株式会社日立製作所 | 電力変換装置 |
JP6751038B2 (ja) | 2017-03-06 | 2020-09-02 | 北海道電力株式会社 | 電力変換装置 |
JP6311050B2 (ja) * | 2017-03-29 | 2018-04-11 | 株式会社日立製作所 | 電力変換装置 |
KR101913746B1 (ko) * | 2017-08-28 | 2018-10-31 | 박찬희 | 주파수 및 전압 조절이 가능한 교류전력 발생기 |
WO2019043758A1 (ja) | 2017-08-28 | 2019-03-07 | 株式会社東芝 | 電力変換装置、電力変換システム、および電力変換システムの使用方法 |
JP7123538B2 (ja) * | 2017-09-19 | 2022-08-23 | キヤノンメディカルシステムズ株式会社 | X線高電圧装置及びx線画像診断装置 |
JP6559907B1 (ja) * | 2018-04-24 | 2019-08-14 | 株式会社東芝 | 電力変換装置、及び定数取得方法 |
KR102141684B1 (ko) * | 2018-08-24 | 2020-09-14 | 한국원자력연구원 | 전류 펄스를 제어하는 모듈레이터 및 그 방법 |
WO2020108736A1 (en) * | 2018-11-27 | 2020-06-04 | Abb Schweiz Ag | Statcom arrangement without phase reactors |
EP4131749A4 (en) | 2020-03-30 | 2023-09-06 | Woo Hee Choi | NON-ROTATING DIRECT CURRENT ELECTRIC GENERATOR |
EP4152583A4 (en) | 2020-05-13 | 2023-11-08 | Woo Hee Choi | NON-ROTATING AC GENERATING DEVICE |
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EP2784925B1 (en) | 2017-08-16 |
KR101633049B1 (ko) | 2016-06-23 |
US9369065B2 (en) | 2016-06-14 |
BR112014012055A2 (pt) | 2017-06-06 |
CN103959633B (zh) | 2016-06-29 |
JP5881386B2 (ja) | 2016-03-09 |
JP2013115837A (ja) | 2013-06-10 |
CN103959633A (zh) | 2014-07-30 |
EP2784925A1 (en) | 2014-10-01 |
KR20140078732A (ko) | 2014-06-25 |
US20140254226A1 (en) | 2014-09-11 |
EP2784925A4 (en) | 2015-10-14 |
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