Small-signal stability for parallel-connected inverters in stand-alone AC supply systems

Coelho, E.A.A.; Cortizo, P.C.; Garcia, Pedro Francisco Donoso

doi:10.1109/28.993176

Cited by 596 publications

(336 citation statements)

References 14 publications

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“…Therefore, droop control is typically applied in microgrids to achieve also a desired reactive power distribution. The most common approach is to control the voltage amplitude with a proportional control, the feedback signal of which is the reactive power generation relative to a reference setpoint [3,4]. See the recent survey [15] for further details.…”

Section: Introductionmentioning

confidence: 99%

“…1 possesses a total of six controllable generation sources of which two are batteries at buses 5b (i = 1) and 10b (i = 5), two are FCs in households at buses 5c (i = 2) and 10c (i = 6) and two are FC CHPs at buses 9b (i = 3) and 9c (i = 4). We assume that all controllable generation units are equipped with frequency and voltage droop control as given in (4). We associate to each inverter its power rating S N i , i ∈n.…”

Section: Simulation Examplementioning

confidence: 99%

“…Stability analysis of droop-controlled microgrids has traditionally been carried out by means of detailed numerical small-signal analysis as well as extensive simulations and experimental studies aiming to characterize a range for the droop gains guaranteeing system stability [4,40,32,1]. As pointed out in [15], most work on microgrid stability has so far focussed on radial microgrids, while stability of microgrids with meshed topologies and decentralized controlled units is still an open research area.…”

Section: Introductionmentioning

confidence: 99%

“…In this case, several modified droop controls [6,43,16] have been proposed. Even in the presence of nonnegligible line resistances the application of the droop controls of [3,4] can be justified, on one hand, via the virtual impedance approach [17] while, on the other hand, invoking their analogy to conventional droop control [10] of SGbased grids.…”

Section: Introductionmentioning

confidence: 99%

“…Since performance under droop control is satisfactory for large SG-based systems, this technique has been adapted to inverter-based grids [3,4,40,1].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Conditions for stability of droop-controlled inverter-based microgrids

Schiffer¹,

Ortega²,

Astolfi³

et al. 2014

Automatica

383

367

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We consider the problem of stability analysis for droop-controlled inverter-based microgrids with meshed topologies. The inverter models include variable frequencies as well as voltage amplitudes. Conditions on the tuning gains and setpoints for frequency and voltage stability, together with desired active power sharing, are derived in the paper. First, we prove that for all practical choices of these parameters global boundedness of trajectories is ensured. Subsequently, assuming the microgrid is lossless, a port-Hamiltonian description is derived, from which sufficient conditions for stability are given. Finally, we propose for generic lossy microgrids a design criterion for the controller gains and setpoints such that a desired steady-state active power distribution is achieved. The analysis is validated via simulation on a microgrid based on the CIGRE (Conseil International des Grands Réseaux Electriques) benchmark medium voltage distribution network.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Simulation Examplementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Since performance under droop control is satisfactory for large SG-based systems, this technique has been adapted to inverter-based grids [3,4,40,1].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Conditions for stability of droop-controlled inverter-based microgrids

Schiffer¹,

Ortega²,

Astolfi³

et al. 2014

Automatica

383

367

View full text Add to dashboard Cite

show abstract

Control of distributed generation systems for microgrid applications: A technological review

Arfeen

Khairuddin

Larik

et al. 2019

Int Trans Electr Energ Syst

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Summary Microgrid implementation requires effective and efficient strategies for controlling the grid parameters. Various problems are encountered with the deployment of distributed generation in terms of reverse power, an imbalance between power generation and nonlinear load. This paper is focused on the existing controllers in terms of their merits and limitations. Furthermore, the state of the art of the local power distribution system especially on renewable energy resources along with energy storage methods is explored. Reliability and stability of power flow between sources and consumers via voltage source inverter are also considered. The emerging microgrid concept in islanding and grid‐connected mode using different controller along with soft computing algorithm are presented. This paper gives the reader fast insight into the context of the controller and its application.

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Dynamics and control of microgrids as a resiliency source

Lee

Liu

et al. 2020

Int Trans Electr Energ Syst

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Microgrids can be operated in a utility‐connected mode or an islanded mode in separation with the transmission or distribution system. As major disasters occur, intentional islanding of a microgrid is a possible solution to serve critical loads, within or outside the microgrids, until the utility service is restored. Through a field test, the technical feasibility to utilize microgrids as a resiliency resource is evaluated. Waveforms of the system dynamics are recorded, and the acquired data and measurements are analyzed and compared with simulation results. Technical issues arising from the starting of an islanded microgrid have been identified. The parallel operation of distributed generators is a major issue in the field test. With different droop characteristics, the dispatch rule of real and reactive power between the DGs is established. Based on the field test experience, a control scheme integrating droop control and feedback control is designed for proper power dispatch among DGs and frequency/voltage control in a microgrid. During the parallel operation, regulation of the frequency and voltage within an acceptable range is provided by the proposed control method. The proposed dispatch and control capabilities would significantly improve the dynamic performance of the microgrid. Simulation results based on a modified IEEE 13‐node test feeder validate the performance of the control strategy.

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Small-signal stability for parallel-connected inverters in stand-alone AC supply systems

Cited by 596 publications

References 14 publications

Conditions for stability of droop-controlled inverter-based microgrids

Conditions for stability of droop-controlled inverter-based microgrids

Control of distributed generation systems for microgrid applications: A technological review

Dynamics and control of microgrids as a resiliency source

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