Oscillator-Based Inverter Control for Islanded Three-Phase Microgrids

Johnson, Brian; Dhople, Sairaj V.; Cale, J.; Hamadeh, Abdullah; Krein, P.T.

doi:10.1109/jphotov.2013.2280953

Cited by 108 publications

(82 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The virtual inertia controller was used to exploit the fact that no PLL is required, hence providing improved voltage regulation compared to traditional STATCOMs with PLL units. Virtual oscillator controller (VOC) is another approach where, instead of mimicking synchronous/induction generators, a non-linear oscillator is implemented within the controller to synchronize DG units without any form of communication [78,79]. This approach is particularly beneficial for a grid largely dominated with DGs, as the controller is intrinsically able to maintain synchronism and share the total system load [80].…”

Section: Other Topologiesmentioning

confidence: 99%

Virtual Inertia: Current Trends and Future Directions

et al. 2017

View full text Add to dashboard Cite

Abstract:The modern power system is progressing from a synchronous machine-based system towards an inverter-dominated system, with large-scale penetration of renewable energy sources (RESs) like wind and photovoltaics. RES units today represent a major share of the generation, and the traditional approach of integrating them as grid following units can lead to frequency instability. Many researchers have pointed towards using inverters with virtual inertia control algorithms so that they appear as synchronous generators to the grid, maintaining and enhancing system stability. This paper presents a literature review of the current state-of-the-art of virtual inertia implementation techniques, and explores potential research directions and challenges. The major virtual inertia topologies are compared and classified. Through literature review and simulations of some selected topologies it has been shown that similar inertial response can be achieved by relating the parameters of these topologies through time constants and inertia constants, although the exact frequency dynamics may vary slightly. The suitability of a topology depends on system control architecture and desired level of detail in replication of the dynamics of synchronous generators. A discussion on the challenges and research directions points out several research needs, especially for systems level integration of virtual inertia systems.

show abstract

Section: Other Topologiesmentioning

confidence: 99%

Virtual Inertia: Current Trends and Future Directions

et al. 2017

View full text Add to dashboard Cite

show abstract

“…As outlined in [11], [12], a straightforward design procedure for the oscillator parameters has been developed. With reference to Fig.…”

Section: B Description Of Parallel Inverter Systemmentioning

confidence: 99%

“…The orthogonality of the virtual-oscillator capacitor voltage and inductor currents is leveraged to generate the three-phase PWM switching waveforms. Further details pertaining to controller implementation for the single-and three-phase inverters are in [12] and [11], respectively. Finally, it is worth mentioning that for analytical purposes, the physical system in Fig.…”

Section: B Description Of Parallel Inverter Systemmentioning

confidence: 99%

“…The L 2 -based approach we adopt in this work to explore synchronization was outlined in [10], where sufficient conditions were derived for synchronization in a system of identical nonlinear oscillators connected to a common node through identical branch impedances. Subsequently in [11], we demonstrated applications of the oscillator-based controller in three-phase, low-inertia microgrids with high penetration of photovoltaic generation. In [10], [11], it was assumed that all inverters had identical power ratings and that the load was a passive impedance.…”

Section: Introductionmentioning

confidence: 99%

“…Subsequently in [11], we demonstrated applications of the oscillator-based controller in three-phase, low-inertia microgrids with high penetration of photovoltaic generation. In [10], [11], it was assumed that all inverters had identical power ratings and that the load was a passive impedance. Building on our previous efforts, in [12] we extended the synchronization condition to both linear and nonlinear loads, proposed a controller and output-filter design approach that promoted power sharing, and introduced a control method to facilitate the addition of inverters into an energized system with minimum transients.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Virtual Oscillator Control for voltage source inverters

Dhople

Johnson

Hamadeh

2013

2013 51st Annual Allerton Conference on Communication, Control, and Computing (Allerton)

Self Cite

View full text Add to dashboard Cite

This paper summarizes a suite of methods that have recently been proposed for the control and synchronization of parallel single-and three-phase voltage source power electronics inverters. Inspired by the phenomenon of synchronization in networks of coupled oscillators, the premise of the proposed Virtual Oscillator Control (VOC) is to control an inverter such that it mimics the dynamics of a nonlinear oscillator. Consequently, the inverters synchronize their voltage outputs and share the load power in proportion to their power ratings without any communication. The VOC design philosophy and sufficient conditions for global asymptotic synchronization are outlined. Simulations validate the analytical results for a parallel system of three-phase inverters serving a constant-power load.

show abstract

Effects of decreasing synchronous inertia on power system dynamics—Overview of recent experiences and marketisation of services

Hartmann

Vokony

Táczi

2019

Int Trans Electr Energ Syst

View full text Add to dashboard Cite

Summary Decrease of rotational mass in modern power systems is a common experience of system operators around the world. The increasing penetration of variable renewable energy production and thus the use of power converters are fundamentally changing the dynamic behaviour of the power system. The aim of the present paper is to provide an overview on the latest advancements of system operators regarding the analysis and mitigation of the reducing inertia. The theoretical background of power system stability and the calculation of the rate of frequency change are introduced to highlight the importance and the weaknesses of certain metrics used by system operators. Specific operational experiences are compared based on peak load and the nature of the systems. Possible responses by system operators which are discussed in the paper include synchronous and synthetic (emulated) inertia, other technical alternatives (virtual synchronous machines, adaptive load‐shedding schemes), and market‐based solutions. Besides summarising the advantages and disadvantages of those, grey areas of regulation and market structure are highlighted to facilitate forward‐thinking.

show abstract

Oscillator-Based Inverter Control for Islanded Three-Phase Microgrids

Cited by 108 publications

References 34 publications

Virtual Inertia: Current Trends and Future Directions

Virtual Inertia: Current Trends and Future Directions

Virtual Oscillator Control for voltage source inverters

Effects of decreasing synchronous inertia on power system dynamics—Overview of recent experiences and marketisation of services

Contact Info

Product

Resources

About