Emission of greenhouse gases and depletion of fossil fuel reserves are two key drivers, which are forcing the mankind to generate the future energy demand from the renewable energy resources. These resources are generally distributed in nature and are directly integrated at distribution levels. Increasing penetration of the distributed energy resources in distribution power networks creates add...

This work describes the design of a DSP (Digital Signal Processor) based Adaptive Numerical Mho relay, to be used for distance protection schemes of long distance transmission lines. The relay settings will be automatically adjusted with the changes of power system parameters with the variation of frequency as well as with the variation of percentage compensation which may occur due to fault /d...

The proliferation of compensators, due to their nonlinear characteristics raises concern over the distortion levels they cause in voltages and currents at the transmission level. In this paper, series compensation by Thyristor Controlled Series Capacitor (TCSC) and shunt compensation by STATCOM are investigated in terms of power quality and their effects on protective relays behavior. For each ...

In this article are presented the basic principles of the numerical protections used for protecting the high-voltage electric lines (110 kV). Is achieved a study for implementing a numerical distance protection DIPA 100, for a high-voltage line (an example from practice). For the numerical relay, is shown the protection characteristic of DIPA 100, characteristics of operation to faults ‘phase-p...

This paper discusses test set up and methodology which may be used for wind power plant (WPP) protection system evaluation. The test set up cosists of a digital simulator, a number of physical relays and recorders, as well as software for modeling, simulation, signal editing, etc. Correct operation of the WPP protection system is crucial during grid disturbances to prevent unwanted power source...

In order to ensure the safety of DFIG when severe fault happens, crowbar protection is adopted. But during slight fault condition, the crowbar protection will not trip, and the DFIG is still excited by AC-DCAC converter. In this condition, operation characteristics of the converter have large influence on the fault current characteristics of DFIG. By theoretical analysis and digital simulation,...

In this paper, a protection system adopting a MultiAgent concept for the distribution systems is proposed. An overcurrent relay(OCR) is developed as an agent by adding its own intelligence, self-tuning and communication ability. The proposed OCR agent is able to detect a fault or a change in the network in an autonomous manner and changes its operating parameters adapting to the new operation c...

The presence of renewable energy resources and conventional distributed generation (DG) in modern distribution networks challenges the traditional protection schemes, since the radial single-fed concept is no longer adopted. In this paper, a new adaptive protection system, which takes advantage of multiple relay setting groups (SGs) and optimisation techniques, is introduced. Moreover, a hardwa...