Abstract
The increasing deployment of Distributed Generation (DG) technologies introduces power quality challenges to the grid, in particular steady state voltage rise at the connection point for DG units. In most distribution networks, control and monitoring of grid parameters is missing, as well as system security is at risk. Smart grid technologies have the capability to realize the real-time measurements and on-load voltage controls. With the steady implementation of smart grid technologies throughout the existing distribution networks, the online voltage control can be achieved ensuring the power quality and voltage levels within the statutory limits. This study presents a methodology for the estimation of voltage profile in a smart distribution network with DG for the online voltage control, taking into account different line X/R ratios and laterals. This method is based on maximum and minimum voltage estimation by remote terminal units (RTUs) placed only at DG connected bus and at capacitor connected bus. Voltage regulation is carried out based on RTUs estimated values. This work is tested on two radial distribution networks with/without DGs and laterals. Comparative results for voltage magnitudes estimated with different methodology are presented. The reported simulation results show that the method presented is capable of estimating the voltage profile along the distribution network with DGs for the online voltage control, considering different line X/R ratios and laterals.
Highlights
Distributed generation (DG) installations are growing exponentially
This paper presents a methodology for the estimation of voltage profile in a smart distribution network with DG for the online voltage control
This work is tested on two radial distribution networks
Summary
Distributed generation (DG) installations are growing exponentially. The major driving forces of distributed generating systems are electricity market liberalization, developments in DG technologies and environmental concerns [1]. A coordinated voltage control scheme for real time implementation in distribution networks with DG is proposed in [14] This scheme is based on voltage estimations by remote terminal units placed at DG and capacitor buses. The presented method estimates the voltages of distribution network characterized by radial configuration of different line X/R ratios and laterals. This method is based on maximum and minimum voltage estimation by RTUs placed only at DG/capacitor connected bus and laterals node point. The reported results show that the method presented is capable of estimating the voltage profile along the distribution network with DGs for the online voltage control. If the voltage rise issue is alleviated, DGs with higher capacities are allowed to connect on distribution networks
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