Distributed Consensus-Based Fault Tolerant Control of Islanded Microgrids

Shahab, Mohammad; Mozafari, Babak; Soleymani, Soodabeh; Dehkordi, Nima Mahdian; Shourkaei, Hosein Mohammadnezhad; Guerrero, Josep M.

doi:10.1109/tsg.2019.2916727

Cited by 115 publications

(52 citation statements)

References 32 publications

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“…There is no fixed trajectory when the particles move in the quantum space, and the parameters of the entire iterative equations are fewer and easier to control, therefore enabling searching for the best particles solution among the entire possible region. The representative expressions in (13) and (14) of the improved QPSO algorithm are formulated as follows, and notably (14) with randomized compression/expansion factor improves the convergent speed and ensures a global convergency, as compared with the customary PSO.…”

Section: Derivation and Analysis Of Nftcsmt Combined With Improved Qpsomentioning

confidence: 99%

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A Novel Fixed-Time-Convergent Sliding Mode Technology Using Improved Quantum Particle Swarm Optimization for Renewable Energy Inverters

Chang¹

2020

Sustainability

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This paper describes a robust feedback technique involving novel fixed-time-convergent sliding mode technology (NFTCSMT) using improved quantum particle swarm optimization (QPSO) to obtain high-performance renewable energy inverters. Customary SMT encounters long time convergence towards the origin and the influence of the dithering. The NFTCSMT can rapidly impel system-following movement to approach the sliding manifold and effectively accelerate the convergence speed to equilibrium states. However, the NFTCSMT cannot easily select the global optimum of the controller parameters subject to large parameter changes and nonlinear interventions, leading to the dither phenomenon/steady-state error still being caused. The dither inflicts decreased control accuracy, high voltage harmonics, major harm in relation to switching components, and great thermal losses in power electronic converters. The improved QPSO including the unique property of a random compression/expansion factor is used to find optimal parameters of the NFTCSMT in practical applications, for the reason that it importantly mitigates the dither and amends convergent speed as well as guaranteeing global convergence. The presented alliance amid NFTCSMT and improved QPSO achieves faster response time and singularityless, and also yields high-accuracy tracking and dither attenuation. The robust stability using Lyapunov theorem of the suggested system has provided precise mathematical derivations. Simulations show that the suggested controller offers less than 0.1% voltage THD (total harmonic distortion) which exceeds IEEE standard 519 under heavily distorted rectifier loads, and less than 10% voltage dip which surpasses IEEE standard 1159 during step load transients. Experimental tests of an algorithmically controlled laboratory prototype (1 kW, 110 Vrms/60 Hz) of a renewable energy inverter (REI) based on digital signal processing manifest less than 0.05% voltage THD in the face of great inductor-capacitor alterations, and less than 10% voltage dip in the face of transient load scenarios.

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Section: Derivation and Analysis Of Nftcsmt Combined With Improved Qpsomentioning

confidence: 99%

“…The variable structure scheme combined with a Lyapunov candidate methodology is designed for gaining a robust response of an island microgrid. Such a control method necessitates an involved circuit design and yields the unwanted dithering phenomenon [13]. An integral sliding mode controlled DC-to-AC system is presented.…”

Section: Introductionmentioning

confidence: 99%

A Novel Fixed-Time-Convergent Sliding Mode Technology Using Improved Quantum Particle Swarm Optimization for Renewable Energy Inverters

Chang¹

2020

Sustainability

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“…In grid-connected mode, the voltage and frequency of the MG are dictated by the main grid, while in islanded/stand-alone mode control units embedded within each DGs are responsible for frequency and voltage restoration, along with managing active and reactive power [7]. To face this issue, the most common approach is to deploy a three-layer hierarchical control architecture [8], which is based on the following interactive modules: i) a Primary Control (PC) level, commonly called zero-level, involving the local hardware control of each DG unit and designed to stabilize the power network, as well as to share active and reactive power among different distributed energy sources, without any communication links; ii) a Secondary Control (SC), properly designed in order to compensate inevitable voltage and frequency fluctuations caused by the operation of PC layer; iii) a Tertiary Control (TC) aimed at optimizing the power flows exchanged by the MG components [9]. Since PC induces unavoidable frequency and voltage deviation, the SC becomes essential for MG performances.…”

Section: Introductionmentioning

confidence: 99%

Distributed Robust Finite-Time Secondary Control for Stand-Alone Microgrids With Time-Varying Communication Delays

et al. 2021

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In this paper we consider the problem of restoring the voltage for stand-alone inverter-based Microgrids despite the effects of the time-delays arising with the information exchange among the electrical busses. To guarantee that all Distributed Generators (DGs) reach in a finite-time and maintain the voltage set-point, as imposed by a virtual DG acting as a leader, we suggest a novel robust networked-based control protocol that is also able to counteract both the time-varying communication delays and natural fluctuations caused by the primary controllers. The finite-time stability of the whole Microgrid is analytically proven by exploiting Lyapunov-Krasovskii theory and finite-time stability mathematical tools. In so doing, delaydependent stability conditions are derived as a set of Linear Matrix Inequalities (LMIs), whose solution allows the proper tuning of the control gains such that the control objective is achieved with required transient and steady-state performances. A thorough numerical analysis is carried out on the IEEE 14-bus test system. Simulation results corroborate the analytical derivation and reveal both the effectiveness and the robustness of the suggested controller in ensuring the voltage restoration in finite-time in spite of the effects of time-varying communication delays.

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“…In order to ensure the reliability and stability of an islanded MG, primary control and secondary control are widely employed, where primary droop control is mainly applied to obtain the active power sharing control and guarantee the reliability of an islanded MG system [9][10][11][12]. However, the deviations of frequency and voltage magnitude are occurred due to the utilization of droop control [13,14]. Fortunately, the secondary control can effectively deal with the above challenges [15][16][17][18], so this paper focuses on the design of secondary control scheme for islanded MG.…”

Section: Introductionmentioning

confidence: 99%

Distributed fixed-time cooperative control of an islanded microgrid under event-triggered mechanism

Xu¹,

Li²,

Cui³

et al. 2021

Preprint

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The secondary cooperative control problem of an islanded microgrid through event-triggered mechanism is investigated in this paper. A distributed fixedtime secondary cooperative control strategy is proposed to obtain frequency and voltage magnitude secondary restoration, and also a proportional active power sharing under an undirected topology. We consider a centralized event-triggered mechanism to alleviate the communication burden and reduce the frequency of controllers update. Through this mechanism, the distributed fixed-time control protocols using frequency, voltage magnitude and active power sampling measurement values of distributed generations (DGs) only when the predefined event-triggered condition is satisfied. Compared with the conventional distributed asymptotic control protocols under period-triggered communication, the secondary control objectives of an islanded microgrid are achieved within a fixed settling time by applying the presented distributed fixed-time control approach, and the upper bound of settling time is unrelated to any initial states. Meanwhile, the presented centralized event-triggered communication method exhibits excellent performance in alleviating communication burden and promoting control efficiency. The theoretical proof is given by adopting Lyapunov method. The simulation studies are conducted to illustrate the effectiveness of the proposed control scheme.

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Distributed Consensus-Based Fault Tolerant Control of Islanded Microgrids

Cited by 115 publications

References 32 publications

A Novel Fixed-Time-Convergent Sliding Mode Technology Using Improved Quantum Particle Swarm Optimization for Renewable Energy Inverters

A Novel Fixed-Time-Convergent Sliding Mode Technology Using Improved Quantum Particle Swarm Optimization for Renewable Energy Inverters

Distributed Robust Finite-Time Secondary Control for Stand-Alone Microgrids With Time-Varying Communication Delays

Distributed fixed-time cooperative control of an islanded microgrid under event-triggered mechanism

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