A Framework for Volt-VAR Optimization in Distribution Systems

Ahmadi, Hamed; Martí, José; Dommel, H.W.

doi:10.1109/tsg.2014.2374613

Cited by 157 publications

(87 citation statements)

References 17 publications

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“…Given the impacts of DERs on feeder voltages, researchers have worked actively on optimizing feeder voltages and reactive power (Volt-VAR optimization) by controlling and coordinating distribution system's legacy devices (capacitor banks and load tap changers (LTCs)) and new devices (smart inverters) [27][28][29][30]. The existing algorithms use centralized or distributed control approach to optimize the real-time operation of the feeder, while assuming that an advanced communication system exists to control and coordinate the feeder devices.…”

Section: Literature Reviewmentioning

confidence: 99%

“…For example, in [27] authors propose a non-cooperative game for Volt-VAR optimization (VVO) while achieving an optimal energy consumption. In [28], a mixed-integer quadratically constrained programming (MIQCP) problem is formulated to optimize VVO by controlling and coordinating capacitor banks, voltage regulators, and load-tap changers for day-ahead operation. References [29,30] present a discussion on multiple Volt-VAR control methods for a utility distribution feeder.…”

Section: Literature Reviewmentioning

confidence: 99%

“…It should be noted that this paper has a different objective when compared to the literature on feeder voltage control methods [27][28][29][30]. Our objective is to evaluate the relative benefits of legacy and new voltage control devices by comparing their different control modes.…”

Section: Objectives and Assumptionsmentioning

confidence: 99%

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Impacts of Voltage Control Methods on Distribution Circuit’s Photovoltaic (PV) Integration Limits

Dubey

2017

Inventions

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Abstract:The widespread integration of photovoltaic (PV) units may result in a number of operational issues for the utility distribution system. The advances in smart-grid technologies with better communication and control capabilities may help to mitigate these challenges. The objective of this paper is to evaluate multiple voltage control methods and compare their effectiveness in mitigating the impacts of high levels of PV penetrations on distribution system voltages. A Monte Carlo based stochastic analysis framework is used to evaluate the impacts of PV integration, with and without voltage control. Both snapshot power flow and time-series analysis are conducted for the feeder with varying levels of PV penetrations. The methods are compared for their impacts on (1) the feeder's PV hosting capacity; (2) the number of voltage violations and the magnitude of the largest bus voltage; (3) the net reactive power demand from the substation; and (4) the number of switching operations of feeder's legacy voltage support devices i.e., capacitor banks and load tap changers (LTCs). The simulation results show that voltage control help in mitigating overvoltage concerns and increasing the feeder's hosting capacity. Although, the legacy control solves the voltage concerns for primary feeders, a smart inverter control is required to mitigate both primary and secondary feeder voltage regulation issues. The smart inverter control, however, increases the feeder's reactive power demand and the number of LTC and capacitor switching operations. For the 34.5-kV test circuit, it is observed that the reactive power demand increases from 0 to 6.8 MVAR on enabling Volt-VAR control for PV inverters. The total number of capacitor and LTC operations over a 1-year period also increases from 455 operations to 1991 operations with Volt-VAR control mode. It is also demonstrated that by simply changing the control mode of capacitor banks, a significant reduction in the unnecessary switching operations for the capacitor banks is observed.

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Section: Literature Reviewmentioning

confidence: 99%

Section: Literature Reviewmentioning

confidence: 99%

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Impacts of Voltage Control Methods on Distribution Circuit’s Photovoltaic (PV) Integration Limits

Dubey

2017

Inventions

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“…A microgrid is an autonomous electric distribution system that combines one or more energy resources with the loads, having its own management and control system, and working as an independent controllable entity [46].…”

Section: Electrical and Thermal Energy Storage Systemmentioning

confidence: 99%

Design and Concept of an Energy System Based on Renewable Sources for Greenhouse Sustainable Agriculture

et al. 2018

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Bio-organic greenhouses that are based on alternative resources for producing heat and electricity stand out as an efficient option for the sustainable development of agriculture, thus ensuring good growth and development of plants in all seasons, especially during the cold season. Greenhouses can be used with maximum efficiency in various agricultural lands, providing ideal conditions of temperature and humidity for short-term plant growing, thereby increasing the local production of fruit and vegetables. This paper presents the development of a durable greenhouse concept that is based on complex energy system integrating fuel cells and solar panels. Approaching this innovative concept encountered a major problem in terms of local implementation of this type of greenhouses because of the difficulty in providing electrical and thermal energy from conventional sources to ensure an optimal climate for plant growing. The project result consists in the design and implementation of a sustainable greenhouse energy system that is based on fuel cells and solar panels.

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“…Since the aim of CVR is to reduce the energy consumption of a distribution system, the problem can be formulated as follows [21]. …”

Section: Power Reference Determination: Dms Functionmentioning

confidence: 99%

A Conservation Voltage Reduction Scheme for a Distribution Systems with Intermittent Distributed Generators

2016

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Abstract:In this paper, a conservation voltage reduction (CVR) scheme is proposed for a distribution system with intermittent distributed generators (DGs), such as photovoltaics and wind turbines. The CVR is a scheme designed to reduce energy consumption by lowering the voltages supplied to customers. Therefore, an unexpected under-voltage violation can occur due to the variation of active power output from the intermittent DGs. In order to prevent the under-voltage violation and improve the CVR effect, a new reactive power controller which complies with the IEEE Std. 1547 TM , and a parameter determination method for the controller are proposed. In addition, an optimal power flow (OPF) problem to determine references for the resources of CVR is formulated with consideration of the intermittent DGs. The proposed method is validated using a modified IEEE 123-node test feeder. With the proposed method, the voltages of the test system are maintained to be greater than the lower bound, even though the active power outputs of the DGs are varied. Moreover, the CVR effect is improved compared to that used with the conventional reactive power control methods.

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A Framework for Volt-VAR Optimization in Distribution Systems

Cited by 157 publications

References 17 publications

Impacts of Voltage Control Methods on Distribution Circuit’s Photovoltaic (PV) Integration Limits

Impacts of Voltage Control Methods on Distribution Circuit’s Photovoltaic (PV) Integration Limits

Design and Concept of an Energy System Based on Renewable Sources for Greenhouse Sustainable Agriculture

A Conservation Voltage Reduction Scheme for a Distribution Systems with Intermittent Distributed Generators

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