Simulink Realization of a Communication-Free Fixed-Time Predictive Controller for a Fuel Cell/Battery/Supercapacitor Hybrid Storage System with Constant Power Load

Author

Potnuru Syam, Parasana Sanjay Sai, Pappala Subhashini

Abstract

 Fuel cell/battery/supercapacitor hybrid energy storage systems (HESS) are expected to keep a dc bus at its set voltage, hand each source the share of the load power that suits its dynamics, and stay stable when the bus feeds constant power loads (CPLs). This work builds and tests, in MATLAB/Simulink, the communication-free controller published recently in IEEE Transactions on Smart Grid, which pairs autonomous fixed-time model predictive control (FxTMPC) and fixed-time disturbance observers (FxTDO) with decentralized hybrid droop control (DHDC). The simulated plant has a boost converter for the fuel cell and two bidirectional buck-boost converters for the battery and supercapacitor, all tied to a 200 V bus with a CPL; each converter is governed by a MATLAB-function controller that runs locally. Reading the simulated waveforms, the bus voltage overshoots by about 0.7 % at start-up, is within 0.05 V of 200 V after roughly 0.2 s, falls by only 0.25 V (0.125 %) when the disturbance arrives at 0.5 s, and is back in band within about 30 ms. The inductor and diode currents are then used to explain what happens to the stored energy during these transients. The findings are in line with the quick, well-damped response claimed by the original authors.

Keywords

Constant power load, decentralized droop control, DC microgrid, fixed-time disturbance observer, hybrid energy storage system, model predictive control.

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References

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