Transition between grid-connected mode and islanded mode in VSI-fed microgrids

Das, Dibakar; Gurrala, Gurunath; Shenoy, U. Jayachandra

doi:10.1007/s12046-017-0659-z

Cited by 27 publications

(16 citation statements)

References 17 publications

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“…Automatic disconnections and reconnections of the microgrid to the main grid are controlled by the microgrid controller. The process has been described by Das et al, Vandoorn et al, and Moradi et al . When using the manual procedure, in case of a blackout, the part of the grid that is supplied by the biogas plant is separated from the main grid by hand, and the loads disconnected from the grid.…”

Section: Resultsmentioning

confidence: 99%

Integrating Biogas Plants into Microgrids for Bridging Temporary Power Supply Interruptions

Kirchner¹,

Thrän²

2019

Chem Eng & Technol

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Renewable energies thus far have not become a part of a grid restoration process. By building small island grids after a blackout, renewable energies can be integrated into the grid restoration process. Bioenergy-based power plants have some importance for the supply of such island grids because of their high degree of reliability and controllability. Modern bioenergy plants have electrical loads within a specific kW range, which can be partially used in demand-side management. A concept for the control structure of off-grid energy systems with a demand-side management using a microgrid of a farm supplied by a biogas plant as an example is presented. For the integrability of electrical loads of the biogas plant into the energy management system of the microgrid, an off-grid control procedure has been designed.

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Section: Resultsmentioning

confidence: 99%

Integrating Biogas Plants into Microgrids for Bridging Temporary Power Supply Interruptions

Kirchner¹,

Thrän²

2019

Chem Eng & Technol

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“…This phenomenon is expected to create a significant disturbance based on the reactive power required to restore the voltage during the fault ride-through process. This can be further minimized by relatively controlling the reactive power sharing in the system prior to the DG disconnection [41,42]. To achieve this, the voltage and frequency deviation with the droop control needs to be implemented for creating a power flow between the connected DGs.…”

Section: Intentional Islandingmentioning

confidence: 99%

Intelligent Transition Control between Grid-Connected and Standalone Modes of Three-Phase Grid-Integrated Distributed Generation Systems

et al. 2021

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This paper proposes an intelligent seamless transition controller for smooth transition between grid-connected (GC) and standalone modes of distributed generation (DG) units in the grid. The development of this seamless controller contributes to two main processes in the transition modes: the synchronization process and an islanding process. For the synchronization process, the stationary reference frame phase-locked loop (SRF-PLL) associated with the voltage source inverter (VSI) is modified using the frequency, voltage deviation, and phase angle information. Furthermore, the islanding process is classified as intentional and unintentional islanding scenarios for achieving efficient transition control. Here, the intentional islanding process is achieved with the information that is available in the system due to the planned disconnection. For the unintentional islanding process, a fuzzy inference system (FIS) is used to modify the conventional droop control using the information of change in active power, voltage, and frequency. To identify the action of the proposed approach during the transition process, numerical simulations are conducted with the hardware-in-loop (HIL) simulator by developing a 10kWp three-phase grid-connected DG system. The results identified the efficient control of the VSI for both islanding and grid connection processes. In the islanding conditions, the proposed controller provides advantage with less detection and disconnection time, and during synchronization, it instantly minimizes the phase-angle deviation to achieve efficient control.

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“…where P load and Q load are the active power and reactive power of the load, respectively, and ω is the system frequency (rad/s). The grid-connected inverter usually operates in constant P-Q mode [40] by using the d-q-axis-based current control. In this control, time-varying quantities (voltage at PoI and DG current injection) are transformed to DC quantities by using Park transformation, as given in the Appendix.…”

Section: Control Of Grid-connected Microgridmentioning

confidence: 99%

“…From (6) and 7, the impedance drop is compensated by the PI control in each loop. The control includes decoupling terms to compensate for the coupling of d-q dynamics and the feedforward terms are used to improve the dynamic performance of the inverter [40]. Islanding occurs when a portion of the distribution system is isolated from the rest of the network.…”

Section: Control Of Grid-connected Microgridmentioning

confidence: 99%