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Use of an inertia-less virtual synchronous machine within future power networks with high penetrations of converters

Yu, Mengran and Roscoe, Andrew J. and Booth, Campbell D. and Dysko, Adam and Ierna, Richard and Zhu, Jiebei and Urdal, Helge (2016) Use of an inertia-less virtual synchronous machine within future power networks with high penetrations of converters. In: Power Systems Computation Conference (PSCC 2016), 2016-06-20 - 2016-06-24.

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Abstract

Conventional converter models for wind turbines and Voltage Source HVDC links, as submitted to System Operators, typically use dq-axis controllers with current injection (DQCI). Recent work carried out by the authors has proven that for DQCI converter-interfaced sources there are overall penetration limits, i.e. the 'tipping points' beyond which the system will become unstable. Initial investigations of this "tipping point", based on a reduced model of the transmission system of Great Britain using phasor simulation within DIgSILENT PowerFactory, are reviewed briefly in this paper. The 'tipping points' relating to maximum penetration of DQCI converter-interfaced sources are subsequently investigated in this paper using a higher fidelity three-phase dynamic power system model in Matlab Simulink. Additionally, a new converter controller, termed here as Virtual Synchronous Machine Zero Inertia (VSM0H), is described and implemented in the model. It is shown that, in principle, it is possible to significantly increase the penetration of converter based generation (up to 100% of installed capacity) without reaching a stability constraint.