A Real Time Coordinated Hydro Governor With Dual STATCOM for Low Frequency Oscillation Damping Using Hybrid Mean DE & TVAPSO

Hydro power generation is one of the most viable renewable sources to meet future energy demand and being a synchronous source, it has also the capability to enhance power system stability. Low frequency oscillations in power grid poses several challenges to operators and need to be damped at earlier stage to maintain stability of power system. The hydro turbine governors usually impart negative damping to these oscillations. So, there can be modification in governor control action to impart damping for these oscillations. In present work the hydro governors are phase compensated and coordinated with dual static synchronous compensator (STATCOM) so as to provide sufficient damping torque. A state space model of dual STATCOM with compensated hydro governor has been developed. Sudden change in reference voltage, uncertain solar and wind penetrations with plug-in electric vehicle as load being considered with different experimentations to impart critical oscillations in power system and proposed controller has been employed to damp these oscillations. Multimachine two area four hydro generators, 39 bus systems with 10 generators and modified IEEE 68 bus system with sixteen generators at different operating conditions have been investigated with proposed controller for oscillation damping. A new multi-objective mean Differential Evolution with time varying accelerated Particle Swarm Optimization algorithm (MeDETVAPSO) has been implemented to tune controller parameters. The proposed controller shows less values of settling time, oscillations peak value and imparting high damping ratio. Settling time, oscillation peak value and minimum damping ratio with proposed controller have been observed as 1.638s, 0.000375pu and 0.987 respectively. These experimentations have been conducted in MATLAB Simulink and verified with real time simulation based on OPAL-RT 4510. The damping capability of proposed controller has been found to be better in contrast to power system stabilizer (PSS), compensated hydro governor, dual STATCOM and performance of MeDETVAPSO has been observed to be better than PSO and DE to tune controller parameters.