An Inductor Current Sensorless Control Strategy Based on Modified VSG Method for Single-Phase Microgrid Application With Seamless Transfer Capability

Zhang, Zhi; Wu, Junkai; Zheng, Liupeng; Xie, Di; Tang, Xiao

doi:10.3389/fenrg.2021.752422

Cited by 2 publications

(2 citation statements)

References 28 publications

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“…Additionally, a current sensorless control scheme based on a modified VSG technique has been proposed for single-phase microgrid applications [23]. It has reduced the inductor's current sensor with a seamless transfer capability.…”

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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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: 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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“…Using VSG technology, the grid-connected inverter generates similar rotor inertia as that of the synchronous generator. VSG is useful for a smooth switching between the island-and grid-connected modes (Zhang et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Frequency Deviation-Free Compound Control Strategy for Seamless Mode Transfer in Microgrids Based on VSG

Zhou

Chen

et al. 2022

Front. Energy Res.

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Virtual synchronous generators (VSG) are widely applied in microgrid technology due to their ability to withstand the impact of grid-connected inverters without inertia. The frequency deviation in the droop control of VSG has a reducing effect on the hosting capacity of the microgrid. Therefore, this article proposes a VSG-based frequency deviation-free control strategy. When the microgrid is in the island/grid connected switching operation mode, it will result in violent fluctuations of the active power on the condition that there is a reactive and fast power change. Therefore, the delay characteristic of a synchronous generator is introduced into VSG to achieve a smooth transition of reactive power and steady-state value that lowers the impact on the system. The rotational inertia is a fixed value, which may fail to meet certain control requirements of the microgrid, such as suppressing power oscillation and rapidly recovering frequency. The fixed moment of inertia is later on improved to an adaptive inertia moment that can effectively solve the problem of rapid rise and fall of frequency as well as improve the frequency response of the microgrid. Finally, the simulation model is established by MATLAB to verify the effectiveness and feasibility of the proposed control algorithm.

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An Inductor Current Sensorless Control Strategy Based on Modified VSG Method for Single-Phase Microgrid Application With Seamless Transfer Capability

Cited by 2 publications

References 28 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

Frequency Deviation-Free Compound Control Strategy for Seamless Mode Transfer in Microgrids Based on VSG

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