Photovoltaic plus energy storage rotational inertia

Can high penetration PV work like a synchronous generator with variable inertia?

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).

Do PVS work like a synchronous generator with variable inertia by energy storage system?

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.

How can variable inertia control improve the stability of PV power system?

The PV-VSG control strategy with variable inertia could further improve the stability of the PV power system. The PV-VSG control could help the PV power system keep stable after the fault. Especially, the variable inertia control strategy based on transient energy could help the PV power system suppress the transient energy.

What is a virtual inertia system?

The combination of RES, short-term energy storage with power electronic devices, and a control algorithm is called a virtual inertia system. The inertia emulation for the inverter, i.e., the compensation of kinetic energy by stored energy devices or energy stored in a DC link capacitor, is known as a virtual synchronous generator (VSG).

How big is the energy storage system for inertia support?

The location of the energy storage system, when concentrated, is a future challenge. Some researchers assume the energy storage system capacity as 10% of the inverter capacity. The size of the energy storage system for inertia support mainly depends upon the power mismatch.

Do inverter-based photovoltaic power stations have rotating elements?

However, the inverter-based photovoltaic (PV) power stations do not have rotating elements and usually operate under the maximum power point tracking (MPPT) control strategy, which means it could not provide adequate energy, neither kinetic energy nor potential energy, to stabilize the power grid.