JP2013055886A5

JP2013055886A5 -

Info

Publication number: JP2013055886A5
Application number: JP2012278826A
Authority: JP
Filing date: 2012-12-21
Publication date: 2013-05-16
Anticipated expiration: 2029-03-30

Description

上記課題を達成するために、本発明では、電圧源と制御電流源の直列回路を備えた電力変換装置において、前記電圧源と前記制御電流源の直列回路を少なくとも３つ並列接続する構成を有し、前記各々の直列回路において前記電圧源として変圧器の一方次側の巻線を有し、前記各々の直列回路において電流源として単位変換器をカスケードに接続する構成を有し、前記単位変換器は、コンデンサと、前記コンデンサの電圧を出力又は前記コンデンサに電力を入力するスイッチング素子を有しており、前記並列接続した前記直列回路の並列接続点として一方側及び他方側の直流端子を有し、前記変圧器の他方次側の巻線を介して交流端子に接続する構成を有し、前記直流端子と前記交流端子との間で電力変換を行うように構成した。 In order to achieve the above object, the present invention has a configuration in which at least three series circuits of the voltage source and the control current source are connected in parallel in a power converter including a series circuit of a voltage source and a control current source. Each of the series circuits has a winding on the primary side of the transformer as the voltage source, and a unit converter is connected in cascade as a current source in each of the series circuits, and the unit conversion The capacitor includes a capacitor and a switching element that outputs the voltage of the capacitor or inputs power to the capacitor, and has DC terminals on one side and the other side as parallel connection points of the series circuit connected in parallel. And it has the structure connected to an alternating current terminal via the coil | winding of the other side of the said transformer, It comprised so that power conversion might be performed between the said direct current terminal and the said alternating current terminal.

そして、本発明の電力変換装置によれば、変圧器の励磁インダクタンスと漏れインダクタンスが、非特許文献１のＭＭＣにおけるリアクトルの役割を兼ねるため、リアクトルが不要となり、このため、電力変換装置を小形・軽量化できる。

According to the power conversion device of the present invention, the exciting inductance and the leakage inductance of the transformer also serve as the reactor in the MMC of Non-Patent Document 1, so that the reactor is unnecessary. Weight can be reduced.

Claims

In a power converter having a series circuit of a voltage source and a control current source, the power conversion device has a configuration in which at least three series circuits of the voltage source and the control current source are connected in parallel , and each of the series circuits serves as the voltage source. A winding having a primary side of the transformer, and having a configuration in which unit converters are connected in cascade as a current source in each of the series circuits, and the unit converter outputs a capacitor and a voltage of the capacitor Or having a switching element for inputting power to the capacitor, having DC terminals on one side and the other side as parallel connection points of the series circuit connected in parallel, and windings on the other side of the transformer A power converter having a configuration of being connected to an AC terminal via a power converter, wherein power conversion is performed between the DC terminal and the AC terminal .

2. The power conversion apparatus according to claim 1 , wherein the voltage source includes only a differential mode (or normal phase / reverse phase) component, and the control current source controls the differential mode (or normal phase / reverse phase) component. Thus, power is exchanged with the voltage source, and the control current source exchanges power with the load device or power source connected to the output terminal by controlling a common mode (or zero phase) component. The power converter characterized by this.

3. The power converter according to claim 1 , wherein the converter arm controls a differential mode (normal phase / reverse phase) current to connect a single phase or multiple phase connected to the primary winding of the transformer. A power conversion device that performs power transfer with a load device or a power source connected to the output terminal by performing power transfer with a phase power system and controlling a common mode (zero phase) component .

4. The power converter according to claim 1, wherein the transformer has a winding structure or means that makes a magnetomotive force caused by a common mode (zero-phase) current flowing in the secondary winding substantially zero. power conversion apparatus characterized by comprising.

The power converter according to any one of claims 1 to 4, wherein the primary winding and the secondary winding are interchanged .