Optimal coordination of voltage control devices in distribution systems connected to distributed generations

The voltage and reactive power control (Volt/VAR Control, VVC) in distribution networks has become a challenging issue with the increasing utilization of distributed generations (DGs). In this paper, a heuristic-based coordinated voltage control scheme that considers distribution voltage control devices, i.e., on-load tap changers (OLTC) and step voltage regulators (SVR), as well as reactive power control devices, i.e., DGs, are proposed. Conventional voltage control methods using non-linear node voltage equations require complex computation. In this paper, the formulation of simplified node voltage equations accounting for changes in tap position of distribution voltage control devices and reactive power changes of reactive power control devices are presented. A heuristic coordinated voltage control scheme using the proposed simplified node voltage equations is proposed. A coordinated voltage control scheme to achieve voltage control for nominal voltage and conservative voltage reduction (CVR) is presented. The results of the proposed schemes are compared with the results from the quadratic optimization method to confirm that the proposed schemes yields suitably similar results. Furthermore, a tap scheduling method is proposed to reduce the number of tap changes while controlling network voltage. The tap position is readjusted using a voltage control performance index (PI). Simulation results confirm that when using this method the number of tap changes is reduced. The proposed scheme not only produces reasonable performance in terms of control voltage of networks but also reduces the number of tap changes made by OLTC. The proposed control method is an alternative candidate for a system to be applied to practical distribution networks due to its simplified calculations and robust performance.

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Optimal allocation process of voltage control devices and operational management of the voltage in distribution systems using the experimental design method

2014 IEEE International Energy Conference (ENERGYCON) ◽

10.1109/energycon.2014.6850559 ◽

2014 ◽

Cited By ~ 1

Author(s):

Jean-Francois Toubeau ◽

Jacques Lobry ◽

Francois Vallee ◽

Zacharie De Greve

Keyword(s):

Experimental Design ◽

Distribution Systems ◽

Optimal Allocation ◽

Design Method ◽

Voltage Control ◽

Allocation Process ◽

Experimental Design Method ◽

Operational Management ◽

Control Devices

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A Novel Voltage Control Method for Distribution Systems based on P&Q Nodal Prices for Distributed Generations

IEEJ Transactions on Power and Energy ◽

10.1541/ieejpes.139.178 ◽

2019 ◽

Vol 139 (3) ◽

pp. 178-185 ◽

Cited By ~ 1

Author(s):

Naoto Yorino ◽

Tsubasa Watakabe ◽

Yuki Nakamura ◽

Yutaka Sasaki ◽

Yoshifumi Zoka ◽

...

Keyword(s):

Distribution Systems ◽

Control Method ◽

Voltage Control ◽

Distributed Generations ◽

Nodal Prices

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Decentralized Voltage Control in Active Distribution Systems: Features and Open Issues

Energies ◽

10.3390/en14092563 ◽

2021 ◽

Vol 14 (9) ◽

pp. 2563

Author(s):

Giuseppe Fusco ◽

Mario Russo ◽

Michele De Santis

Keyword(s):

Distribution Systems ◽

Control Structure ◽

Voltage Control ◽

Distribution Networks ◽

Practical Implementation ◽

Control Approach ◽

Secondary Voltage ◽

Control Devices ◽

Time Frames ◽

Open Issues

Voltage control is becoming a key issue in active distribution systems, which are electric distribution networks characterized by a large penetration of DERs. Traditional voltage control devices, as well as the active and reactive powers injected by DERs, can be used as ancillary services to support voltage profiles along the distribution feeders. Due to the peculiar characteristics of active distribution systems, the decentralized control approach presents the most promising technical and economical features. In the paper, the decentralized voltage control structure is hierarchically decomposed into different control levels, characterized by different objectives and time frames. The primary and secondary control levels have been analyzed, always according to a decentralized approach. For each level, the various techniques for solving the voltage control problem that have been proposed in the literature are presented, and their main features compared. The main open issues related to the real time practical implementation of the decentralized architectures at both primary and secondary voltage control levels are investigated, keeping always in mind both technical and economical aspects, which always represent the components of a trade-off solution.

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Coordinated and optimal voltage control for voltage regulation using firefly algorithm

Indonesian Journal of Electrical Engineering and Computer Science ◽

10.11591/ijeecs.v16.i2.pp568-576 ◽

2019 ◽

Vol 16 (2) ◽

pp. 568

Author(s):

Muhamad Najib Kamarudin ◽

Tengku Juhana Tengku Hashim

Keyword(s):

Distribution Systems ◽

Firefly Algorithm ◽

Renewable Energy Sources ◽

Optimization Technique ◽

Voltage Control ◽

Distribution Networks ◽

Voltage Regulation ◽

Load Flow ◽

Distributed Generations ◽

Voltage Deviation

The operation and control of electricity in distribution networks has faced great challenges as a large number of distributed generations (DGs) are integrated. Connection of distributed generations (DGs) in the distribution system offers advantages in terms of reducing distribution and transmission costs as well as encouraging the use of renewable energy sources. The power flow in the distribution systems is no longer moving in a single direction and this resulted the system to become as active distribution networks (ADN). One of the main problems in ADN is the voltage regulation issue which is to maintain the voltage to be within its permissible limits. Several methods of voltage control methods are available and focus is given in finding the optimal voltage control using artificial intelligence techniques. This paper presents an optimal and coordinated voltage control method while minimizing losses and voltage deviation of the network. The optimal and coordinated voltage control scheme is implemented on an IEEE 13 bus distribution network for loss and voltage deviation minimization in the networks. Firefly Algorithm (FA) which is a known heuristic optimization technique for finding the optimal solution is used in this work. The results are compared with another optimization method known as Backtracking Search Algorithm (BSA) for identifying the best setting for solving the voltage regulation problem. In order to solve the multi-objective optimization issue, the MATPOWER load flow simulation is integrated in the MATLAB environment with the optimization algorithm.

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