Frequency stability analysis in low frequency AC systems for renewables power transmission

Dong, J. and Attya, A.B. and Anaya-Lara, O. (2017) Frequency stability analysis in low frequency AC systems for renewables power transmission. In: 6th IEEE International Conference on Clean Electrical Power, 2017-06-27 - 2017-06-29.

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The foreseen high penetration levels of wind energy will have serious implications on frequency stability, hence developed control methods of wind turbine and alternative technologies including energy storage should enable the provision of frequency support by wind power. Active research is ongoing to investigate the possibility of collecting and transmitting offshore wind power through low frequency alternating current systems (LFAC). This paper develops a novel method to enhance frequency support capability of generators connected to a LFAC system. The leveraged frequency regulation ability of the generators at LFAC system is emphasized. The voltage is proportional to the frequency of the LFAC system, so that the transformers can be protected when frequency drops. Then the generators at LFAC system acquire sufficient time for frequency regulation. In this paper, a hydro generator at LFAC system is regarded as an energy storage plant, which is connected to the LFAC system rather than normal frequency grid.