Seamless Transfer Algorithm of AC Microgrid Inverter Compensating Load Current for Weak Grid

Lim, Jae-Uk; Kwon, Il-seob; Kim, Hag-Wone; Cho, Kwan-Yuhl

doi:10.3390/en12040728

Cited by 3 publications

(3 citation statements)

References 24 publications

(32 reference statements)

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“…It can calculate the active P inv and Q inv reactive power from the (v cd , v cq ) and (i od , i oq ), which are sensed and changed locally. In Equation (11), the formula for calculating P inv and Q inv is defined as follows:…”

Section: Droop Control Strategymentioning

confidence: 99%

“…An approach for smooth transfer using an indirect current control strategy was investigated in [10]. A feed-forward load current for a weak grid was proposed to ensure a seamless transfer, as reported in [11]. A hybrid control approach that combined the integral sliding mode and backstepping technique has been described to enable flexible switching between the SA and GC modes, with an excellent performance and efficiency [12].…”

Section: Introductionmentioning

confidence: 99%

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The Design and Processor-In-The-Loop Implementation of a Super-Twisting Control Algorithm Based on a Luenberger Observer for a Seamless Transition between Grid-Connected and Stand-Alone Modes in Microgrids

et al. 2023

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The abrupt transfer from grid-connected (GC) to stand-alone (SA) operation modes is one of the major issues that may threaten the stability of a distributed generation (DG) system. Furthermore, if the islanding mode happens, it is vital to take into consideration the load voltages or load current waveforms as soon as feasible. This paper develops an advanced control technique based on a super-twisting sliding mode controller (ST-SMC) for a three-phase inverter operating in both the GC and SA modes. This control scheme is proposed to ensure a smooth transition from the GC to SA mode and enhance the load voltage waveforms under the islanding mode. In addition, to minimize the operational costs of the system and the complexity of the studied model, a digital Luenberger observer (DLO) with a proper design is adopted for estimating the inverter-side current. The control scheme of the whole system switches between a current control mode during the GC mode and a voltage control mode during the SA mode. The super-twisting control algorithm is applied to the outer voltage control loop involved in the cascaded voltage/current control scheme in the SA mode. Simulation tests of a three-phase inverter are performed for the purpose of assessing the suggested control performance by using the PowerSim (PSIM) software and comparing it with a classical PI controller. Furthermore, a processor-in-the-loop (PIL) implementation in a DSP board TMS32F28335 while debugging is conducted using code composer studio 6.2.0. The obtained results show efficient control properties, such as a smooth transition among the microgrid (MG) operating modes, as well as effectiveness and robustness during both the GC and SA operation modes.

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Section: Droop Control Strategymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Design and Processor-In-The-Loop Implementation of a Super-Twisting Control Algorithm Based on a Luenberger Observer for a Seamless Transition between Grid-Connected and Stand-Alone Modes in Microgrids

et al. 2023

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“…Droop control controls the frequency and magnitude using active and reactive power in an inverter configured in parallel [28]. In [29], a technique has been proposed to accomplish seamless transfer by the feed‐forward compensation of the load current, based on a direct current control technique. In [20], a fuzzy logic‐based strategy is proposed for planning feasible reference trajectories that ensure a smooth transition from GC to SA mode without requiring control structure reconfiguration.…”

Section: Introductionmentioning

confidence: 99%

Fault‐tolerant modular multilevel converter for a seamless transition between stand‐alone and grid‐connected microgrid

Mahmoud

Hafez

Yousef

et al. 2022

IET Power Electronics

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Recently, renewable distributed generation (DG) systems have emerged to improve the power system security and reliability while reducing the environmental incompatibility of fossil fuel power plants. DG could operate either as a standalone and/or as a grid‐connected power system. The interfacing circuits of DG and their controls have to comply with utility quality regulations and afford a seamless transition from online to offline and vice versa. This article advises a simple and robust control scheme for a modular multilevel converter (MMC) that interfaces with a photovoltaic (PV) generator. The proposed control method ensures high‐quality output voltage/current waveform in online and/or offline operating modes. Moreover, the proposed control provides a seamless and swift transition from standalone to grid‐connected and vice versa. The exhibited control scheme is simulated with MATLAB/Simulink. Real‐time simulator OPAL‐RT OP4510 is used to verify the displayed simulation results. The simulation results determine the accomplishment of the proposed control technique for a seamless transition from the grid‐connected mode to the standalone mode and vice versa via MMC.

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Inverter-based islanded microgrid: A review on technologies and control

Fani

Shahgholian

Alhelou

et al. 2022

e-Prime - Advances in Electrical Engineering, Electronics and E

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Seamless Transfer Algorithm of AC Microgrid Inverter Compensating Load Current for Weak Grid

Cited by 3 publications

References 24 publications

The Design and Processor-In-The-Loop Implementation of a Super-Twisting Control Algorithm Based on a Luenberger Observer for a Seamless Transition between Grid-Connected and Stand-Alone Modes in Microgrids

The Design and Processor-In-The-Loop Implementation of a Super-Twisting Control Algorithm Based on a Luenberger Observer for a Seamless Transition between Grid-Connected and Stand-Alone Modes in Microgrids

Fault‐tolerant modular multilevel converter for a seamless transition between stand‐alone and grid‐connected microgrid

Inverter-based islanded microgrid: A review on technologies and control

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