Penalty-Based Volt/VAr Optimization in Complex Coordinates

Jabr, Rabih A.; Džafić, Izudin

doi:10.1109/tpwrs.2021.3119946

Cited by 11 publications

(5 citation statements)

References 39 publications

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“…The goal of VVC is mainly to lessen voltage violations that occur due to load and renewable power variations and VVC has secondary objectives such as loss minimization and conservation voltage reduction (CVR). The VVC optimization problem has continuous and discrete variables; it is practically solved using the power-flow-based multi-step discrete programming search, also known as discrete coordinate-descent search [34] - [37], and other adaptations [38]. CVR contributes to saving energy and reducing the peak load; whose use is described by [39] - [41] in an active distribution management system (ADMS) for the networks with DERs.…”

Section: Main Functions Of Dms For Smart Gridmentioning

confidence: 99%

Distribution Management Systems for Smart Grid: Architecture, Work Flows, and Interoperability

Jabr

Džafić

2022

Journal of Modern Power Systems and Clean Energy

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The smart grid integrates advanced sensors, a twoway communication infrastructure, and high-performance computation-based control. The distribution management systems for smart grid include several functions for manipulating legacy voltage control devices and distributed energy resources through closed-loop volt/var control, leading to wide-area regulation of voltages in the presence of fluctuating power. The other primary distribution network analysis application is concerned with automatic fault location and service restoration following fault events, aiming to provide the grid with autonomous intelligence for self-healing. Communication technologies are vital to enable the computing applications of distribution networks, whether they work in centralized or distributed modes. This paper presents the state of the art in distribution management system architectures and modern workflows showing data exchange, practical parallel implementations designed to handle large amounts of data, in addition to communication standards that serve as interoperability enablers. It demystifies the relationship between different functions developed independently by power system researchers and shows their operation as a complete system, thus placing them in a better context for future research and development.

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Section: Main Functions Of Dms For Smart Gridmentioning

confidence: 99%

Distribution Management Systems for Smart Grid: Architecture, Work Flows, and Interoperability

Jabr

Džafić

2022

Journal of Modern Power Systems and Clean Energy

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“…Distribution centers now rely on automation process that dynamically calculates set-points for the local voltage regulators, transformer tap changers, and capacitor banks [8], [9]. Volt-var optimization (VVO) is becoming one of the key applications [10].…”

Section: F Voltage Fluctuations Caused By Renewable Generationmentioning

confidence: 99%

Distribution Control Centers in the US and Europe: Commonalities, Differences, and Lessons

Vadari¹,

Džafić

Koch

et al. 2022

Journal of Modern Power Systems and Clean Energy

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The distribution control center (DCC) has evolved from a sideshow in the traditional distribution service center to a major centerpiece of the utility moving into the decentralized world. Mostly, this is the place where much of the action is happening due to new forms of energy that are coming into the distribution system. This creates the flexibility of operation and increased complexity due to the need for increased coordination between the transmission control center and DCC. However, the US and European utilities have adapted to this change in very different ways. Firstly, we describe the research works done in a DCC and their evolutions from the perspectives of major US utilities, and those enhanced by the European perspective focusing on the coordination of distribution system operator and transmission system operator (DSO-TSO). We present the insights into the systems used in these control centers and the role of vendors in their evolution. Throughout this paper, we present the perspectives of challenges, operational capabilities, and the involvement of various parties who will be responsible to make the transition successful. Key differences are pointed out on how distribution operations are conducted between the US and Europe.

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“…Besides, some studies have proposed different optimal control methods of reactive power to improve the voltage regulation. A Volt/VAr optimization method which operates in complex variables based on the Wirtinger calculus is proposed in [30]. It employs a penalty method with a probabilistic rounding technique to control voltage magnitude and controller parameters within operating limits.…”

Section: B Voltage Var Control Problemmentioning

confidence: 99%

A Linearized Branch Flow Model Considering Line Shunts for Distribution System and Its Application in Volt/VAr Control

Lin¹,

Nazir²,

Pal³

et al. 2022

Preprint

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With the fast expansion of the power grid and increasing complexity due to modern equipment, power flow models with non-convexity and long computing time are not suitable for network calculation and optimization problems. Therefore, this paper proposes a linearized branch flow model (LBF) considering line shunts (LBFS). The strength of LBF lies in its linear mathematical structure, and hence the convex nature, which is primarily achieved by regarding the apparent power flow as the branch current magnitude. Moreover, the calculation accuracy in nodal voltage magnitude is significantly improved by appropriately modeling line shunt admittances and network equipment like transformers, shunt capacitors and distributed generators (DG). We show the application scope of LBFS by controlling the network voltages through a two-stage stochastic optimization Volt/VAr control (VVC) problem considering DG output uncertainty. Since LBFS results in a linear VVC program, the global solution is guaranteed. Simulations show that VVC framework can optimally dispatch the discrete control devices, viz. substation transformers and shunt capacitors, and also optimize the decision rules for real time reactive power control of DGs. Besides, the computing efficiency is significantly improved compared to traditional VVC methods.

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Penalty-Based Volt/VAr Optimization in Complex Coordinates

Cited by 11 publications

References 39 publications

Distribution Management Systems for Smart Grid: Architecture, Work Flows, and Interoperability

Distribution Management Systems for Smart Grid: Architecture, Work Flows, and Interoperability

Distribution Control Centers in the US and Europe: Commonalities, Differences, and Lessons

A Linearized Branch Flow Model Considering Line Shunts for Distribution System and Its Application in Volt/VAr Control

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