KETEP 세계에너지시장정보

1. A unified power flow controller, which is configured on a transmission line near an HVDC converter station, comprising:
a series converter, a series transformer, a DC converter and a control circuit, wherein
one end of the DC converter is connected to a DC transmission line of the HVDC converter station via first DC switch block, the other end of the DC converter is connected to a DC side of the series converter via second DC switch block, an AC side of the series converter is connected to an AC transmission line via the series transformer, an active power consumed by the series converter during operation is supplied by the DC converter and a reactive power consumed by the series converter during operation is supplied by its internal capacitors;
the DC converter is directly connected to the series converter via the control circuit, an AC output voltage at the AC side of the series converter is controlled by the control circuit to regulate a line power of the unified power flow controller;
the control circuit is connected to the first and second DC switch block respectively to control ON/OFF of each of the first and second DC switch blocks,
the control circuit configured to operate the unified power flow controller in a unified power flow controller (UPFC) mode, wherein
the active power consumed by the series converter during operation is supplied by the DC converter, and the reactive power consumed by the series converter during operation is supplied by its internal capacitors;
the control circuit is configured to control the AC output voltage, including amplitude and phase angle, at the AC side of the series converter; and
the series converter is configured to output the active and reactive power to regulate the active and reactive power on the transmission line of the unified power flow controller.