Protection of Low Voltage CIGRE Distribution Network

Abstract

High quality electricity services are the prime objectives in the modern power systems around the world. One of the main players to achieve this is the protection of the system which needs to be fast, reliable and cost effective. The study about the protection of the Low Voltage (LV) CIGRE distribution grid and networks like this has been proposed in this paper. The main objective of this paper is to develop protection against short circuit faults which might appear anywhere in the network. The protection of the power networks that comprises of renewable energy generation units is complicated because of the bidirectional flow of the current and is a challenge for the protection engineers. The selection of the protection devices in this paper is made to protect the network against faults in grid connected and island mode of operation. Ultra-fast fuses are proposed in order to protect the inverters used for Photovoltaic (PV) and battery applications. The disconnection of the PV solar panels when in island mode is made by proposing switch disconnecting devices. ABB is currently using these kinds of disconnection devices for the purpose of protecting solar panels against over voltages in the case of islanding. The over speed protection of the existing Wind Turbine Generator (WTG) in the CIGRE network in case of grid loss is also proposed in this paper.

A simplified stability analysis method for LV inverter-based microgrids

“…Parameters of inverters and corresponding coupling impedances, interconnecting line and loads are given in Table 1. For the value of the interconnecting line impedance Z l , impedance of the main distribution feeder of CIGRE network has been chosen [28]. The rated power of DG-1 is devised to be the half of DG-2, then the droop coefficients are set as m 1 = 2m 2 = 0.005 and n 1 = 2n 2 = 0.01.…”

International Journal of Electronics and Telecommunications

“…Malfunctions and failures in the supply of electrical energy cause disturbance to the reliability of the quality and safety of the power system. Therefore, having a protection system for electrical appliances dispels these fears and hassles and is therefore an integral part of power systems [9,10].…”

Programmable protective device for LV distribution system protection

“…The quality and security of power system are disturbed due to faults and failures occurring. Protection against sudden over voltages in substations is a vital part of the overall reliability of power systems [2,3]. The protection against over voltage is mainly necessary for human being because the people will lose their life due to overvoltage shock.…”