Design of Robust Fractional-Order PID Control of Supercapacitor Energy Storage Systems

doi:10.12204/j.issn.1000-7229.2021.02.010

Abstract

Abstract:

This study designs a robust fractional-order PID control (RFOPID) strategy of supercapacitor energy storage systems (SCES). At first, the nonlinearities, unmodelled dynamics and parameter uncertainties of SCES are estimated effectively by a high-gain perturbation observer (HGPO). Furthermore, a fractional-order PID (FOPID) controller is utilized to completely compensated the perturbation estimation. No accurate SCES model is required while only the dq-axis currents need to be measured, which is easy to implement in hardware. Finally, three case studies are used to evaluate the performance of RFOPID control. Simulation results show that RFOPID has the best control performance and the strongest robustness under various operation conditions compared with other controller.

Key words: supercapacitor energy storage systems, robust fractional-order PID control, perturbation observer

CLC Number:

TM712

LI Jinghang, LAI Weijian, CHEN Weihong, LI Jingguang, YANG Deling, YU Tao. Design of Robust Fractional-Order PID Control of Supercapacitor Energy Storage Systems[J]. ELECTRIC POWER CONSTRUCTION, 2021, 42(2): 77-84.

Figures/Tables 9

Fig.1 Structure of SCES connected to power grid

Fig.2 Energy storage characteristics of SCES

Fig.3 Overall RFOPID control structure of SCES

Fig.4 The topology of SCES for renewable energy integration

Table 1 Control parameters of three controllers

Fig.5 System responses obtained under power regulation

Fig.6 System responses obtained under the three-phase short-circuit fault

Fig.7 System responses obtained under uncertain power grid parameters

Table 2 IAE indices and overall control costs of different controllers obtained on two scenariospu

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