IEEE Transactions on Energy Conversion, Vol.33, No.4, 1659-1668, 2018
Reduced Capacitance Battery Storage DC-Link Voltage Regulation and Dynamic Improvement Using a Feedforward Control Strategy
This paper proposes a feedback/feedforward control strategy to attenuate the dc-link voltage variations in a reducedcapacitor battery energy storage system. It also identifies the impact of dc-link voltage variations on a battery energy storage system's response dynamics and power capabilities. It shows that addition of a feedforward controller to the existing feedback controller improves the dc-link voltage regulation and consequently the response dynamics of the reduced-capacitor battery energy storage system. It formulates a power setpoint change as a disturbance to the battery energy storage control system. The battery energy storage system is analyzed using an averaged-value modeling technique. Small-signal analysis is then used to tune feed-forward controller parameters. The performance of the proposed controller is evaluated via an electromagnetic transient software (PSCAD/EMTDC), and the findings are experimentally validated using a laboratory-sized test bench.
Keywords:Averaged-value modeling;battery energy storage system;dc-link voltage regulation;feed-forward control;voltage source converter model