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In this paper, a selective input/output strategy is proposed for improving the life of photovoltaic energy storage (PV-storage) virtual synchronous generator (VSG) caused by random load interference, which can sharply reduce costs of storage device. The strategy consists of two operating modes and a power coordination control method for the VSGs.
In the PV-storage system, the PV capacity is 250 kW, the energy storage capacity is 550 kWh, and the energy storage power is 250 kW, the VSG inverter capacity is 500 kW. The load on the VSG grid bus changes abruptly from 500 kW to 800 kW at 30s.
The PV-storage system measures the voltage amplitude (UG) and angular frequency (ωG) at the access point of the finite capacity grid, the voltage amplitude (E) and angular frequency (ω) at the outlet of the inverter and the VSG grid-connected current in real-time, and calculates the grid-connected power Pe.
However, the load in the grid-connected PV-storage system is susceptible to random disturbances, and if the PV-storage VSG responds to all disturbances indiscriminately, it will cause unnecessary charging and discharging of the energy storage and thus reduce its life.
In this operation mode, the capacity of the energy storage configuration is small, and it is mainly used to smooth out the random fluctuation of PV output, so the output power of the grid-connected inverter in steady-state operation should track the PV output value after the energy storage is smooth out.
According to the above parameters, the PV-storage system is operated in tracking PV mode, the initial PV output power is 150 kW, the PV power mutates to 200 kW at 20s, and the PV power mutates to 250 kW at 40s, and each power curve is shown in Fig. 9. Fig. 9. Power curve of PV step disturbance in tracking PV mode.
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In this paper, a selective input/output strategy is proposed for improving the life of photovoltaic energy storage (PV-storage) virtual synchronous generator (VSG) caused by …
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In this paper, a selective input/output strategy is proposed for improving the …
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National Renewable Energy Laboratory, Sandia National Laboratory, SunSpec Alliance, and the SunShot National Laboratory Multiyear Partnership (SuNLaMP) PV O&M Best Practices …