Hybrid controller for safe microgrid operation

Yu, Tao; Susuki, Yoshihiko; Hikihara, Takashi

doi:10.1587/nolta.2.347

Cited by 6 publications

(4 citation statements)

References 23 publications

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“…In recent years, there has been growing interest in the behavior of power-grid networks from academic and industrial viewpoints [1][2][3][4][5], Networks can be classified into two types: alternating-current (ac) networks and direct-current (dc) net works [6], With the recent increases in dc loads, dc generation, and dc storage thanks to recent progress in power electronics, dc bus systems are widely expected to play an important part in future electronic power systems [6]. Unfortunately, the dc bus system has a serious drawback, namely the bus line voltage has the potential to be unstable if constant power loads (CPLs), which continuously consume the same amount of power, are connected to the bus line.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of dc bus networks and their stabilization by decentralized delayed feedback

2015

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The present paper deals with the dynamics of bus networks, which consist of several identical dc bus systems connected by resistors. It is analytically guaranteed that the stability of a stand-alone dc bus system is equivalent to that of the networks, independent of the number of bus systems and the network topology. In addition, we show that a decentralized delayed-feedback control can stabilize an unstable operating point embedded within the networks. Moreover, this stabilization does not depend on the number of bus systems or the network topology. A systematic procedure for designing the controller is presented. Finally, the validity of the analytical results is confirmed through numerical examples.

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Section: Introductionmentioning

confidence: 99%

Dynamics of dc bus networks and their stabilization by decentralized delayed feedback

2015

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“…In [39] the authors use a hybrid dynamical system for modeling and analysis of the cascading failure leading to the 2003 blackout in Italy. In [40], [41] the authors use a hybrid automaton model for control of a microgrid with specifications of power balancing and stability. In [42] the authors discuss a hybrid system viewpoint in the VIKING project for resilient control of power networks.…”

Section: Related Workmentioning

confidence: 99%

“…This is just for ease of presentation and clarity. Often it is required to consider these for solving control problems on power grid dynamics: see [40], [41]. Also note that trajectories in the current model (1) of HA evolve continuously as well as in discrete jumps.…”

Section: A Hybrid Automatonmentioning

confidence: 99%

A Hybrid System Approach to the Analysis and Design of Power Grid Dynamic Performance

et al. 2012

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We describe an approach to the analysis and design of power grid dynamic performance based on hybrid systems theory. Power grid is a large-scale Cyber-Physical System for transmission of electrical energy. The joint dynamics of physical processes and cyber elements in power grids are typical of a mixture of continuous and discrete behaviors, that is, hybrid dynamics. We address problems on stability that are basic concerns in the performance of current and future power grids with the hybrid dynamics. Measures for stability of power grids are interpreted as safety specifications in hybrid system models and are translated into restrictions on the systems' reachable sets of states. Algorithmic reachability analysis of hybrid systems enables analysis of safe initial states and hence quantitative estimation of stability regions. Also it contributes to synthesis of safe initial states as well as switching conditions in order to satisfy safety specifications in a power grid. We demonstrate the approach for two problems on transient stability of the single machine-infinite bus system and on fault release control of a multi-machine power grid.

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“…Using the backward reachable set to verify safety Microgrid model that includes distributed energy resources, a load, and a distribution net work[15] …”

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confidence: 99%

On the Use of Reachable Set for Safe Operation in Microgrid

Asayama

Hikihara

2019

Transactions of ISCIE

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Microgrid is one of the new power supply systems expected for expanding introduction of renewable energy and improving the power quality. However, generators in a microgrid have risk at step-out because a microgrid utilizes many changeable power resources. For a safe operation in a microgrid, we evaluate reachable sets for unsafe sets of gas-engine generators according to a microgrid model. Reachable sets have already been applied to a study on air traffic management and electric power system. The unsafe sets are defined to avoid large deviations of rotor speed. Setting plurality of unsafe set, system's safe set can be obtained by calculating backward reachable sets for unsafe sets. This paper considers two compensation operations for load fluctuation. Based on the characteristic of reachable sets for unsafe sets, demand response strategy can be examined. Finally, numerical simulation shows that setting based on reachable sets can suppress the angular frequency variation of gas-engine generators in microgrid.

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Hybrid controller for safe microgrid operation

Cited by 6 publications

References 23 publications

Dynamics of dc bus networks and their stabilization by decentralized delayed feedback

Dynamics of dc bus networks and their stabilization by decentralized delayed feedback

A Hybrid System Approach to the Analysis and Design of Power Grid Dynamic Performance

On the Use of Reachable Set for Safe Operation in Microgrid

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