Adaptive protection system for distribution networks with distributed energy resources

Abstract

This paper deals with the concept development and laboratory testing of an adaptive protection system for distribution networks with distributed energy resources. Adaptation of protection relay settings according to currently available short-circuit current at respective grid nodes, is one solution to cope with the challenges originating from distributed generation. The challenges in conventional protection systems in low and medium voltage grids are discussed and a new concept of an adaptive network overcurrent protection is developed. The soft- and hardware realization of the concept are described and first results of laboratory tests are presented

Transmission Network Enhancement with Renewable Energy

“…A Smart Electric Grid can identify where electricity is lost or where the system is not in balance or optimized. Such optimization can save 3% or more of overall electric demand without requiring any change in consumer behavior [65].…”

“…has accelerated the transition towards greener energy sources. Keeping in view the aforementioned challenges of integrating renewable energy sources to the grid, some of the possible ways for renewable energy utilization in a grid are [65]:…”

Distributed generator status estimation for adaptive feeder protection in active distribution grids

“…the mal-tripping of a healthy feeder due to reverse currents caused by a fault on an adjacent feeder and the blinding effect i.e. the failure or delayed operation of protection relays due to reduced fault current seen at the start of the feeder [1][2]. There are many solutions suggested in literature to account for these problems, for example: In [3], the authors propose to solve the blinding effect by changing the relay settings during the planning stage.…”

“…A very appealing approach to safely accommodate increasing levels of DGs consists in adapting the protection relay settings with the changing operating conditions of the network [2] [6]. Identifying the changes in operating conditions, (mainly the status of the DGs) is a challenging task as nowadays most distribution systems are poorly observable.…”

Adaptive Protection Scheme for a Distribution System Considering Grid-Connected and Islanded Modes of Operation

“…In this regard, the studies in [41][42][43][44][45][46][47] suggested the adaptive protection scheme considering several types of relays (distance relays, OCRs, etc. ), also considering grid-connected and islanded mode of operations.…”