Unified Distributed Control for DC Microgrid Operating Modes

Morstyn, Thomas; Hredzak, Branislav; Demetriades, Georgios D.; Agelidis, Vassilios G.

doi:10.1109/tpwrs.2015.2406871

Cited by 174 publications

(75 citation statements)

References 34 publications

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“…According to (5), terminal voltage ratio of (V b /V a ) is able to be adjusted by controlling the ratio of D a to D b . As described in the equations above, V link should be higher than the terminal voltages.…”

Section: Circuit Implementationmentioning

confidence: 99%

High-Efficiency Floating Bidirectional Power Flow Controller for Next-Generation DC Power Network

et al. 2018

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To realize flexible power flow control for DC power networks, we have proposed a bidirectional power flow controller (BPFC) based on a bidirectional buck-boost converter. It is possible to control the power flow by intentionally introducing additional voltage difference between two terminals. However, we have not investigated the efficiency of BPFC for power flow control in detail so far (in previous papers). Because many power converters are expected to be installed in future DC power networks, efficiency investigation is vital. In this paper, we first reveal the energy efficiency of BPFC and study ways to improve the efficiency. Then, we propose a novel structure of the BPFC, which drastically improves its efficiency. We call the proposed structure floating bidirectional power flow controller (F-BPFC). The efficiency and characteristics of the F-BPFC are experimentally compared with those of the BPFC and its superiority is clarified in this paper.

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Section: Circuit Implementationmentioning

confidence: 99%

High-Efficiency Floating Bidirectional Power Flow Controller for Next-Generation DC Power Network

et al. 2018

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“…Here, the feedback element F N M is the connection between subsystem sensor N and controller M. This type of distributed feedback gain structure offers sparse communication between the grid and EMS [6]. Consequently, sensors can share information with their neighbouring controllers only, which reduces communication overheads and offers flexible controlling infrastructure over centralised control strategies.…”

Section: Proposed Distributed Control Strategymentioning

confidence: 99%

“…The main reasons of incorporating microgrid including distributed energy resources (DERs) into the grid are due to the low green house gas emissions, reduced transmission losses and cost [3], [4], [5]. Unfortunately, their intermittent nature of the power generation pattern brings critical challenges for power system operation and stability [6].…”

Section: Introductionmentioning

confidence: 99%

Distributed dynamic state estimation over a lossy communication network with an application to smart grids

Rana

2016

2016 IEEE 55th Conference on Decision and Control (CDC)

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Abstract-In contrast to the traditional centralised power system state estimation methods, this paper investigates the interconnected optimal filtering problem for distributed dynamic state estimation considering packet losses. Specifically, the power system incorporating microgrids is modelled as a state-space linear equation where sensors are deployed to obtain measurements. Basically, the sensing information is transmitted to the energy management system (EMS) through a lossy communication network where measurements are lost. This can seriously deteriorate the system monitoring performance and even lose network stability. Secondly, as the system states are unavailable, so the estimation is essential to know the overall operating conditions of the electricity network. Availability of the system states provides designers an accurate picture of the power network, so a suitable control strategy can be applied to avoid massive blackouts due to lose network stability. Particularly, the proposed estimator is based on the mean squared error between the actual state and its estimate. To obtain the distributed estimation, the optimal local and neighbouring gains are computed to reach a consensus estimation after exchanging their information with the neighbouring estimators. Then the convergence of the developed algorithm is theoretically proved. Afterwards, a distributed controller is designed based on the semidefinite programming approach. Simulation results demonstrate the accuracy of the developed approaches under the condition of missing measurements.Index Terms-Distributed controller, distributed dynamic estimation, energy management system, packet losses, linear matrix inequality.

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“…The key to solving such problems is shaping the system equilibria to have the desired consensus. This shaping is usually realized by dynamic consensus controllers [25]. For example, in [8], an distributed integral controller is used for voltage regulation.…”

Section: Introductionmentioning

confidence: 99%

Robust Stability Analysis of DC Microgrids With Constant Power Loads

Liu

Zhang

Rizzoni

2018

IEEE Trans. Power Syst.

138

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Abstract-This paper studies stability analysis of DC microgrids with uncertain constant power loads (CPLs). It is well known that CPLs have negative impedance effects, which may cause instability in a DC microgrid. Existing works often study the stability around a given equilibrium based on some nominal values of CPLs. However, in real applications, the equilibrium of a DC microgrid depends on the loading condition that often changes over time. Different from many previous results, this paper develops a framework that can analyze the DC microgrid stability for a given range of CPLs. The problem is formulated as a robust stability problem of a polytopic uncertain linear system. By exploiting the structure of the problem, we derive a set of sufficient conditions that can guarantee robust stability. The conditions can be efficiently checked by solving a convex optimization problem whose complexity does not grow with the number of buses in the microgrid. The effectiveness and nonconservativeness of the proposed framework are demonstrated using simulation examples.

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Unified Distributed Control for DC Microgrid Operating Modes

Cited by 174 publications

References 34 publications

High-Efficiency Floating Bidirectional Power Flow Controller for Next-Generation DC Power Network

High-Efficiency Floating Bidirectional Power Flow Controller for Next-Generation DC Power Network

Distributed dynamic state estimation over a lossy communication network with an application to smart grids

Robust Stability Analysis of DC Microgrids With Constant Power Loads

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