Control of inverter-based micro-grids

Green, Tim; Prodanović, Milan

doi:10.1016/j.epsr.2006.08.017

Cited by 293 publications

(213 citation statements)

References 11 publications

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“…The latter are power electronic devices, which possess significantly different physical characteristics from synchronous generators (SGs). This implies that new control and operation strategies are needed in networks with a large share of DG units [2].…”

Section: Introductionmentioning

confidence: 99%

Droop-controlled inverter-based microgrids are robust to clock drifts

Schiffer

Ortega

Hans

et al. 2015

2015 American Control Conference (ACC)

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Abstract-Clock drift in digital controllers is of great relevance in many applications. Since almost all real clocks exhibit drifts, this applies in particular to networks composed of several individual units, each of which being operated with its individual clock. In the present work, we investigate the effect of clock drifts in inverter-based microgrids. Via a suitable model that incorporates this phenomenon, we prove that clock inaccuracies hamper synchronization in microgrids, in which the individual inverters are operated with a fixed uniform constant electrical frequency. In addition, we show that the wellknown frequency droop control renders stability of a lossless microgrid robust with respect to clock inaccuracies. This claim is established by using stability results reported previously by the authors for lossless inverter-based microgrids with ideal clocks. We also discuss the effect of clock drifts on active power sharing. The analysis is illustrated via a simulation example.

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Section: Introductionmentioning

confidence: 99%

Droop-controlled inverter-based microgrids are robust to clock drifts

Schiffer

Ortega

Hans

et al. 2015

2015 American Control Conference (ACC)

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“…1) Active Load (Current or Power) Sharing Methods: Active load (current or power) sharing methods involve the master-slave approach [72] and the current limitation control [73]. In this kind of control strategies, the DER unit operating as grid-forming (master) unit regulates the system voltage and frequency, whereas the rest of DER (slave) units receive the current references, through communication links, from either the master unit or the previous slave unit.…”

Section: B Instantaneous Power Balancing Strategiesmentioning

confidence: 99%

A Review of Power Electronics Based Microgrids

Wang¹,

Guerrero²,

Blaabjerg³

et al. 2012

Journal of Power Electronics

153

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The increased penetration of Distributed Energy Resources (DER) is challenging the entire architecture of conventional electrical power system. Microgrid paradigm, featuring higher flexibility and reliability, becomes an attractive candidate for the future power grid. In this paper, an overview of microgrid configurations is given. Then, possible structure options and control methods of DER units are presented, which is followed by the descriptions of system controls and power management strategies for AC microgrids. Finally, future trends of microgrids are discussed pointing out how this concept can be a key to achieve a more intelligent and flexible power system.

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“…Microgenerators fit in the PQ model (or constant power model) once they are commanded via a complex power reference as in [8,9]. It is also a reasonable approximation for many residential and industrial loads 1 .…”

Section: Model For the Physical Layermentioning

confidence: 99%

A Distributed Feedback Control Approach to the Optimal Reactive Power Flow Problem

Bolognani

Zampieri

2013

Control of Cyber-Physical Systems

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Abstract. We consider the problem of exploiting the microgenerators connected to the low voltage or medium voltage grid in order to provide distributed reactive power compensation in the power distribution network, solving the optimal reactive power flow problem for the minimization of power distribution losses subject to voltage constraints. The proposed strategy requires that all the intelligent agents, located at the generator buses, measure their voltage and share these data with the other agents via a communication infrastructure. The agents then adjust the amount of reactive power injected into the grid according to a policy which is a specialization of duality-based methods for constrained convex optimization. Convergence of the algorithm to the configuration of minimum losses and feasible voltages is proved analytically. Simulations are provided in order to demonstrate the algorithm behavior, and the innovative feedback nature of such strategy is discussed.

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Control of inverter-based micro-grids

Abstract: -

Cited by 293 publications

References 11 publications

Droop-controlled inverter-based microgrids are robust to clock drifts

Droop-controlled inverter-based microgrids are robust to clock drifts

A Review of Power Electronics Based Microgrids

A Distributed Feedback Control Approach to the Optimal Reactive Power Flow Problem

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