PMU and FMU Based Investigation of the Effect of Static System State Estimation on the Performance of a Transmission Network

Year 2018, Volume: 2 Issue: 4, 123 - 132, 28.12.2018

İfedayo Oladeji , Micheal Adu

Abstract

The
characterisation of a power system at every operating state is a requirement
for reliable and secured operation. This paper presents the evaluation of the
state variables of a power system with static state estimation under steady
state and transient conditions. Power flow for evaluation of the initial system
variables was obtained through Newton
Raphson algorithm. Real time system data is obtained through the phasor
measurement units (PMUs) installed at remote terminal units (RTUs) of each load
points. Weighted least square estimation method is applied on the initial state
parameters; power flows, voltage
magnitudes and angles and frequency obtained from the load flow evaluation to
obtain reliable and final system state parameters. The result obtained through
simulation of a 40 bus network on MATLAB (PSAT) shows 32.5% and 50% variances
of state variables above 1%. Static state estimation (SSE) with PMU also
provided improvement in the network performance through transmission
loss reduction and overall system stability. A real time data acquisition (PMU)
and data analysis system (SSE) is required to fully model, accurately
characterise and ensure secured operation of the network under steady state and
transient conditions.

Keywords

State estimation, Phasor measurement units (PMU), Weighted least square, Steady state stability, Transient Stability

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