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Power System Study

Generation &Transmission system operators, as well as the scientific community, pay attention to the power system stability and safety. On the present, questions of the power system stability and safety are high actual. It is necessary to find out such preventive measures to avoid severe contingencies in the power system operation, e.g. blackout.

The study of electromagnetic and electromechanical transients is a mature field that plays an important role in the design of modern power systems. There is an effort to find some power system stability margin of which we could say “how stable the power system is” in given condition. Sophisticated models, complex solution techniques, and powerful simulation tools have been developed to perform studies that are of supreme importance in the design and validation of modern power systems. The stability of a system refers to the ability of a system to return back to its steady state without losing synchronism when subjected to a disturbance. Usually, power system stability is categorized into Steady State, Transient and Dynamic Stability.

Characteristics Of Power System

We use EMTP-RV , CDEGS , ETAP as our simulation platforms for the following studies.

Steady State Study

Steady State Stability studies are restricted to small and gradual changes in the system operating conditions. Here, we basically concentrate on restricting the bus voltages close to their nominal values and phase angles between two buses are not too large and check for the overloading of the power equipment and transmission lines. These checks are usually done using power flow studies.

The ability of a power system to maintain stability under continuous small disturbances is investigated under the name of Dynamic Stability (also known as small-signal stability). These small disturbances occur due to random fluctuations in loads and generation levels. In an interconnected power system, these random variations can lead catastrophic failure as this may force the rotor angle to increase steadily.

  • Load flow analysis
  • Protection coordination
  • IPP - independent power producer is landing and integration
  • Line and Cable Constants (Parameters) & Induction Analysis
  • Cable sizing
  • Detailed Fault Current Distribution

Transient State Analysis

Transient Stability involves the study of the power system following a major disturbance. A larger disturbance, the synchronous alternator load angle changes due to sudden acceleration of the rotor shaft. The objective of the transient stability study is to ascertain whether the load angle returns to a steady value following the clearance of the disturbance. Transient response of power systems under following conditions are also to be done for the safe and reliable operation.

  • Switching.
  • Lightning
  • Short Circuit
  • Ferro resonance
  • Magnetic Inrush
  • Harmonic Study
  • Circuit Breaker feasibility
  • Line Energization