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.
Highlights
Photovoltaic (PV) power is one of the prominent renewable resources and likely to replace a significant proportion of fossil-fuels in the future
3 Methods The main purpose of the stability controller is to give out a variable inertia of the PV-based virtual synchronous generator (PV-virtual synchronous generators (VSG)), the transient energy of the power system will attenuate and the power grid with PVs will recover to a stable state after the disturbance
maximum power point tracking (MPPT): No VSG control strategy is applied, and the PV is operated under the MPPT mode
Summary
Photovoltaic (PV) power is one of the prominent renewable resources and likely to replace a significant proportion of fossil-fuels in the future. With the increasing penetration of PV power, power system operators will encounter severer challenges [1–3]. PVs are connected to the power grid through the voltage-source converters (VSCs). The PVs are significantly different from the conventional synchronous generators in terms of physical and electrical characteristics. The high penetration PVs will deteriorate the frequency stability of power system. For the protection of the PVs, the power system with high penetration PVs must own the capacity of low voltage and high voltage ride through. The transient stability of power system with high penetration PVs is a problem should be followed
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