Power converter with oil filled reactors

A power converter for transferring power between a high voltage DC connection and a high voltage AC connection, the power converter comprising a power converter assembly comprising:

• a first converter arm;
• a first reactor;
• a second reactor;
• and
• a second converter arm,
• wherein the first converter arm, the first reactor, the second reactor and the second converter arm are connected serially between positive and negative terminals of the DC connection,
• wherein the high voltage AC connection is provided between the first converter arm and the second converter arm,
• wherein each one of the first and second converter arms comprises a plurality of converter cells and each one of the converter cells comprises a switching element and an energy storage element,
• wherein both the first reactor and the second reactor are oil filled reactors placed between the first converter arm and the second converter arm and configured to act as filters to provide a sufficiently sinusoidal waveform on the AC connection, and
• wherein the AC connection is provided between the first reactor and the second reactor and comprises a conductor provided within an outer enclosure with an open end, allowing an oil filled AC connection when the AC connection is connected.