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1. (WO2018219415) IMPROVEMENTS RELATING TO VOLTAGE CONTROL IN RENEWABLE POWER PLANTS

Pub. No.:    WO/2018/219415    International Application No.:    PCT/DK2018/050105
Publication Date: Fri Dec 07 00:59:59 CET 2018 International Filing Date: Wed May 16 01:59:59 CEST 2018
IPC: H02J 3/38
F03D 7/02
H02J 3/00
Applicants: VESTAS WIND SYSTEMS A/S
Inventors: GUPTA, Manoj
KUMAR, Ravi
SIVASANKARAN, Janakiraman
JARDIEL, Mario Dante
TIWARI, Anoop Vijay
NAYEBI, Kouroush
Title: IMPROVEMENTS RELATING TO VOLTAGE CONTROL IN RENEWABLE POWER PLANTS
Abstract:
There is provided a method of operating a renewable power plant that is connected to a wider power network by a bus. The method comprises: identifying a predetermined voltage condition of the renewable power plant or of the bus; controlling the renewable power plant to maintain zero reactive power exchange at the bus for a first period; calculating an average voltage level of the bus that was achieved during the first period; and controlling the renewable power plant to maintain the voltage output at a set voltage level for a second period, the set voltage level being substantially equal to the calculated average voltage level. The method ensures that voltage oscillations due to a push-pull phenomenon between a power plant controller and the power network do not upset the stability of the grid.