Small rating capacitive energy storage for dynamic performance improvement of automatic generation control

Abstract

A new scheme using a small rating capacitive energy storage (CES) unit for the improvement of the dynamic performance of a power system is proposed. A comprehensive digital computer model of a two-area interconnected power system including governor deadband non-linearity, steam reheat constraints and boiler dynamics is developed. Time domain simulations are used to study the performance of the power system and control logic. Optimisation of gain parameters and stability studies are carried out by the second method of Lyapunov. Suitable methods for control of the CES units are described. .1 System data [4,12,20] Area capacity, P Rl = P R2 = 1000 MW f° = 60 H z K pl = K p2 = 120 Hz/p.u. MW co o = 3.14 radian R l = R 2 = 2.4 Hz/p.u. MW D 1 =D 2 = 8.33 x 10" 3 p.u. MW/Hz B l =B 2 =p = 0.425 p.u. MW/Hz T pl = T p2 = 20 S T°2 = 0.0707 MW/radian AP m = 0.01 p.u. MW AP D2 = 0.0 p.u. MW Appendixes 11

Super-capacitor based energy storage system for improved load frequency control

“…The realistic/detailed models of energy storage and its PCs are not discussed and a ramp load disturbance has been used instead of traditional step disturbance. Even though in [8] capacitive energy storage has been used for improved load frequency control of a power system, with governor dead band non-linearity, yet the PCS model and the practical implementation aspects have not been dealt in detail. PCS is different from the one used in present studies and a linear proportional controller designed on the basis of eigen value analysis has been used.…”

“…In the literature [8][9][10] small capacitive energy storage has been used in LFC problem. In [10] an elementary study on capacitive storage device applied to LFC problem has been reported.…”

“…Very few researchers [8][9][10] have pursued the application of capacitive energy storage units to load frequency control problem. The energy density of these common capacitive energy storage systems is very low and hence their application to power systems is not appealing.…”

Applying Optimal Sliding Mode Based Load-Frequency Control in Power Systems with Controllable Hydro Power Plants

“…Since identification procedure presented in [41] can only be used for CAs that have only one power plant engaged in LFC, it AUTOMATIKA 51(2010) 1, [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] can not be used here because LFC in CA1 from Fig. 2 is conducted using three HPPs.…”

“…Models for LFC algorithms testing purposes are generally linear and they have all power plants engaged in LFC within a CA replaced with just one substitute power plant [2][3][4][5]. That power plant can be of thermal type [6][7][8][9] or hydro type [10][11][12][13].…”