| Abstract: |
| The Photovoltaic (PV) plants are significantly different from the conventional synchronous generators in terms of
physical and electrical characteristics, as it connects to the power grid through the voltage-source converters. High
penetration PV in power system will bring several critical challenges to the safe operation of power grid including
transient stability. To address this problem, the paper proposes a control strategy to help the PVs work like a
synchronous generator with variable inertia by energy storage system (ESS). First, the overall control strategy of the
PV-based virtual synchronous generator (PV-VSG) is illustrated. Then the control strategies for the variable inertia of
the PV-VSG are designed to attenuate the transient energy of the power system after the fault. Simulation results of
a simple power system show that the PV-VSG could utilize the energy preserved in the ESS to balance the transient
energy variation of power grid after fault and improve the transient stability of the power system. |
| Key words: Energy storage system, Virtual synchronous generator, Variable inertia, Transient stability, Photovoltaic power |
| DOI：10.1186/s41601-017-0070-0 |
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| Fund: |
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