Online hierarchical and distributed method for voltage control in distribution smart grids

Fallahzadeh-Abarghouei, Hossein; Nayeripour, Majid; Hasanvand, Saeed; Waffenschmidt, Eberhard

doi:10.1049/iet-gtd.2016.1096

Cited by 24 publications

(20 citation statements)

References 23 publications

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“…For LV levels, in practice, most utilities with a European-style network design use only the secondary distribution transformers equipped with off-load tap changers to control voltages. Once again, the use of both the traditional and novel MV volt/var control solutions mentioned above has been intensively proposed in the most current literature, but it is not applied in practice [20][21][22][23][24][25][26][27][28][29][30][31]. The use of OLTC transformers in secondary distribution substations is currently the closest to realizing an LV reality [19,[32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

“…Depending on the technology, two different methods of operating an OLTCST are possible: (1) a synchronized tap change among the three phases or (2) decoupled control [32]. Most previous works have dealt with uniform and common tap positions for all three phases of the MV/LV-controlled transformer (3P-OLTCST) [19][20][21]28,30,31,[33][34][35], but increasingly, more tap position settings among transformer phases are being proposed (1P-OLTCST) [24,25,29,32,36]. Decoupled control is obviously a great deal more attractive for LV networks because of their unbalanced nature.…”

Section: Introductionmentioning

confidence: 99%

“…Among the first group, different levels of "intelligence" have been proposed to reach a global solution that is as close as possible to the optimal one [21,24,28,32]. Analytical approaches are integrated solutions that solve an optimization problem to determine the best control actions that both minimize an objective function and fulfill all the electrical constraints [29,30,36]. While rule-based solutions reach a suboptimal solution but are easier to implement and need less network information, analytical approaches are more rigorous from a mathematical point of view and ensure not only an optimal solution but also that all the variables are within their limits.…”

Section: Introductionmentioning

confidence: 99%

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Accurate Assessment of Decoupled OLTC Transformers to Optimize the Operation of Low-Voltage Networks

2019

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Voltage control in active distribution networks must adapt to the unbalanced nature of most of these systems, and this requirement becomes even more apparent at low voltage levels. The use of transformers with on-load tap changers is gaining popularity, and those that allow different tap positions for each of the three phases of the transformer are the most promising. This work tackles the exact approach to the voltage optimization problem of active low-voltage networks when transformers with on-load tap changers are available. A very rigorous approach to the electrical model of all the involved components is used, and common approaches proposed in the literature are avoided. The main aim of the paper is twofold: to demonstrate the importance of being very rigorous in the electrical modeling of all the components to operate in a secure and effective way and to show the greater effectiveness of the decoupled on-load tap changer over the usual on-load tap changer in the voltage regulation problem. A low-voltage benchmark network under different load and distributed generation scenarios is tested with the proposed exact optimal solution to demonstrate its feasibility.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Accurate Assessment of Decoupled OLTC Transformers to Optimize the Operation of Low-Voltage Networks

2019

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“…Yilmaz and El‐Shatshat presented voltage/VAR control with OLTC and wind‐based renewable distributed generations to minimize power losses and voltage deviation. Voltage control in distribution systems with coordination between DG and OLTC was presented in Fallahzadeh‐Abarghouei et al using distributed gradient algorithm. In Kulmala et al Supervisory control and data acquisition (SCADA)‐based scheme was developed for optimal voltage regulation with DG and OLTC using rule‐based technique and optimization algorithm to determine DG outputs and tap positions.…”

Section: Introductionmentioning

confidence: 99%

“…Various optimization techniques were reported in previous studies [39][40][41][42][43][44][45][46][47] and sensitivity-based techniques 41,42,47,48 were proposed by many authors to determine optimal location and rating of D-STATCOM in distribution systems to minimize power losses and improve voltage profile. Few researchers have studied D-STATCOM placement problem along with DG in previous studies 42,43,46,49 and reconfiguration of radial distribution systems in Fallahzadeh-Abarghouei et al 29 and Bai et al 37 Differential evolution (DE) algorithms were used in other studies 39,40,44 for optimal placement of D-STATCOM in distribution systems. The authors addressed impact of reconfiguration on D-STATCOM placement problem.…”

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confidence: 99%

Optimal coordinate control of OLTC, DG, D-STATCOM, and reconfiguration in distribution system for voltage control and loss minimization

Murty

Sharma

2018

Int Trans Electr Energ Syst

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Summary This paper presents optimal coordination and management of on‐load tap changer (OLTC), distribution static compensator (D‐STATCOM), distribution generation (DG), and reconfiguration to maximize annual cost savings and improve voltage profile using hybrid optimization. An analytical approach is developed to find optimal setting of OLTC. Optimal reconfiguration of the network is derived using genetic algorithm. Optimal location of DG and D‐STATCOM is determined using gravitational search algorithm, and optimal ratings are obtained using interface with MATLAB and GAMS environment. Fourteen realistic case studies are investigated in this paper work. In the first scenario, regulating devices are disabled to monitor the voltage profile and energy loss of the test system. In the remaining cases, influence of OLTC, DG, D‐STATCOM, and reconfiguration is independently and simultaneously studied. In the last scenario, OLTC, DG, D‐STATCOM, and reconfiguration are enabled to maintain voltage security and minimize power losses. Simulation results are obtained for IEEE 69‐bus test system and compared with other existing methods available in the literature. The proposed technique is reliable and efficient to obtain global optimal solution. Simulation results clearly indicate that optimal coordination and management among OLTC, DG, D‐STATCOM, and reconfiguration is required to maximize annual cost savings and maintain voltage at each node as per statutory requirements. Moreover, the analysis has been carried out for time‐varying distribution system with realistic load model.

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Novel Distributed Active and Reactive Power Management Approach for Renewable Energy Resource and Loads in Distribution Network

Karimi

Nayeripour

Hassanzadeh

2018

Iran J Sci Technol Trans Electr Eng

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This paper proposes active and reactive power management based on distributed optimization method that is employed to minimize loss, voltage variation of buses, load shedding and variation of power generation. In this approach, energy efficiency is improved and voltage profile is kept in an acceptable range under different operating conditions of renewable energy resources and loads. Three various power control methods such as (1) active power control (APC), (2) reactive power control (RPC) and (3) simultaneous APC with RPC are implemented by proposed active and reactive power management unit (ARMU). Measurement units collect essential information and send them to ARMU in each bus. ARMU determines the active and reactive power set points of dispatchable DGs and loads and reactive set points of nondispatchable DGs in each bus. Also ARMU updates set point in less than one second and all controllable units contribute to voltage and power control which is proper for online optimization. Simulation results show the superior performance of this control method to regulate dynamic active and reactive power set points in distribution network.

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Online hierarchical and distributed method for voltage control in distribution smart grids

Cited by 24 publications

References 23 publications

Accurate Assessment of Decoupled OLTC Transformers to Optimize the Operation of Low-Voltage Networks

Accurate Assessment of Decoupled OLTC Transformers to Optimize the Operation of Low-Voltage Networks

Optimal coordinate control of OLTC, DG, D-STATCOM, and reconfiguration in distribution system for voltage control and loss minimization

Novel Distributed Active and Reactive Power Management Approach for Renewable Energy Resource and Loads in Distribution Network

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