Nonlinear adaptive backstepping controller design for controlling bidirectional power flow of BESSs in DC microgrids

Roy, T. K.; Mahmud, M. A.; Oo, Amanullah Maung Than; Haque, M. E.; Muttaqi, Kashem M.; Mendis, Nishad

doi:10.1109/ias.2016.7731875

Cited by 26 publications

(3 citation statements)

References 27 publications

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“…Moreover, the control structure of a DCMG is simple as compared to the AC counterpart as it does not require the additional reactive power support and mechanism for the grid synchronization which in turn ensures the faster controllability and reliability of the MG [3][4][5]. In addition, DCMGs can eliminate the necessity of DC/AC or AC/DC power conversion stages as the output power of major microgrid components (e.g., PV units) is DC except some wind generators [6,7]. As a result, DCMGs are frequently incorporated with DC distribution systems to meet the consumer demand in some applications such of energy storage technologies such as BESSs, hydrogen-based energy storages, SCESSs, etc.…”

Section: Introductionmentioning

confidence: 99%

A nonlinear double‐integral sliding mode controller design for hybrid energy storage systems and solar photovoltaic units to enhance the power management in DC microgrids

Ghosh¹,

Roy

Pramanik

et al. 2022

IET Generation Trans & Dist

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In this paper, a nonlinear decentralized double‐integral sliding mode controller (DI‐SMC) is designed along with an energy management system (EMS) for the DC microgrid (DCMG). This DCMG includes having a hybrid energy storage system (HESS) that incorporates a battery energy storage system (BESS) and supercapacitor energy storage system (SCESS) while the load demand is met through the power generated from solar photovoltaic (SPV) units. First, dynamical models of each subsystem of DCMGs such as the SPV system, BESS, and SCESS are developed to capture highly nonlinear behaviors of DCMGs under various operating conditions. The proposed nonlinear DI‐SMC is then designed for each power unit in DCMGs to ensure the desired voltage level at the common DC‐bus and appropriate power dispatch of different components to fulfill the load requirement of the DCMG. On the other hand, an energy management system (EMS) is designed to determine the set point for the controller with an aim of ensuring the power balance within DCMGs under various operating conditions where the overall stability is assessed using the Lyapunov theory. Simulation studies along with the processor‐in‐loop validation, including a comparative study with a proportional‐integral (PI) controller, verify the applicability and effectiveness of the EMS‐based DI‐SMC under different operating conditions of the DCMG.

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Section: Introductionmentioning

confidence: 99%

A nonlinear double‐integral sliding mode controller design for hybrid energy storage systems and solar photovoltaic units to enhance the power management in DC microgrids

Ghosh¹,

Roy

Pramanik

et al. 2022

IET Generation Trans & Dist

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“…However, two major challenges need to be addressed for a stable and reliable operation of power electronic-based DCDNs in conjunction of RESs, where the first challenge is the low terminal voltage of RESs while important to maintain a relatively high and stable terminal voltage of the DC-bus as all loads and RESs are either directly or indirectly connected to this bus [8][9][10]. As a results, DC-DC boost converters (DDBCs) are usually used in DCDNs as the interface between the DC-bus and RESs, which need to be appropriately controlled to achieve the desired DC-bus voltage [11,12]. On the other hand, the maintenance of stable and reliable operations becomes even more challenging when a large number of DC-DC converters are used to interface loads and RESs [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Design of Nonlinear Backstepping Double-Integral Sliding Mode Controllers to Stabilize the DC-Bus Voltage for DC–DC Converters Feeding CPLs

et al. 2021

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This paper proposes a composite nonlinear controller combining backstepping and double-integral sliding mode controllers for DC–DC boost converter (DDBC) feeding by constant power loads (CPLs) to improve the DC-bus voltage stability under large disturbances in DC distribution systems. In this regard, an exact feedback linearization approach is first used to transform the nonlinear dynamical model into a simplified linear system with canonical form so that it becomes suitable for designing the proposed controller. Another important feature of applying the exact feedback linearization approach in this work is to utilize its capability to cancel nonlinearities appearing due to the incremental negative-impedance of CPLs and the non-minimum phase problem related to the DDBC. Second, the proposed backstepping double integral-sliding mode controller (BDI-SMC) is employed on the feedback linearized system to determine the control law. Afterwards, the Lyapunov stability theory is used to analyze the closed-loop stability of the overall system. Finally, a simulation study is conducted under various operating conditions of the system to validate the theoretical analysis of the proposed controller. The simulation results are also compared with existing sliding mode controller (ESMC) and proportional-integral (PI) control schemes to demonstrate the superiority of the proposed BDI-SMC.

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“…To supply the necessary power in the case of insufficient PV power and electrochemical storage power, many studies propose the DG working in either continuous operation or frequent switching. In Reference [12], a nonlinear adaptive back-stepping controller is proposed to balance the power and stabilize the voltage of the DC bus. In Reference [13], PV power and DG power are controlled by a linear quadratic controller.…”

Section: Introductionmentioning

confidence: 99%

Power Management Strategy for an Autonomous DC Microgrid

Yin¹,

Sechilariu

et al. 2018

Applied Sciences

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Owing to the intermittent nature of renewable energy, microgrids in islanding operation mode require backup power sources. The diesel generator is the most popular backup source, but does not offer an instantaneous start-up and cannot immediately provide the necessary power. Therefore, supercapacitors are used to assist the power balance during diesel generator start-up thanks to their responsiveness and high-power density. This paper proposed a power management strategy for an autonomous DC microgrid based on a photovoltaic source, electrochemical storage, a supercapacitor, and a diesel generator. The proposed control system aimed at power balance while accounting for the slow start-up characteristic of the diesel generator, the self-discharge of the supercapacitor, the dynamic load management, and the economic operating mode of the diesel generator. The main contribution of this paper centered on a power management strategy solving the above issues integrally, and economic analysis for the diesel generator and microgrid. Experimental studies were carried out for different scenarios and the results obtained confirmed the effectiveness of the proposed strategy. Furthermore, the study provided a comparison between the economic operating and load-following modes of the diesel generator and demonstrated that the economic operating mode of the diesel generator can reduce the total energy cost of the DC microgrid.

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Nonlinear adaptive backstepping controller design for controlling bidirectional power flow of BESSs in DC microgrids

Cited by 26 publications

References 27 publications

A nonlinear double‐integral sliding mode controller design for hybrid energy storage systems and solar photovoltaic units to enhance the power management in DC microgrids

A nonlinear double‐integral sliding mode controller design for hybrid energy storage systems and solar photovoltaic units to enhance the power management in DC microgrids

Design of Nonlinear Backstepping Double-Integral Sliding Mode Controllers to Stabilize the DC-Bus Voltage for DC–DC Converters Feeding CPLs

Power Management Strategy for an Autonomous DC Microgrid

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