Optimization of battery/ultra‐capacitor hybrid energy storage
Sizing of both battery and ultra-capacitor must be optimized in such a way that it is able to handle maximum change in energy demand while keeping the voltage and frequency
Under the four control strategies of A, B, C and D, the hybrid energy storage participating in the primary frequency modulation of the unit |Δ fm | is 0.00194 p.u.Hz, excluding the energy storage system when the frequency modulation |Δ fm | is 0.00316 p.u.Hz, compared to a decrease of 37.61 %.
In practice, the frequency fluctuation of a unit is generally caused by continuous and irregular load fluctuations, therefore, simulate the impact of coupling a hybrid energy storage system and a single energy storage system on the primary frequency regulation of thermal power units under continuous disturbances.
Compared with the thermal power unit participating in primary frequency modulation alone, the output power and various evaluation indexes of the coupled hybrid energy storage system are reduced by approximately 1/2.
Hybrid energy storage systems combine different types of energy storage technologies, such as battery energy storage, supercapacitors, compressed air energy storage, flywheel energy storage, etc. These techniques in their respective advantages, such as rapid response ability, high energy density, long life and so on.
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