## A variable DC loading unit for the transient control of a power system |

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abc abc AC-DC power converter algorithm angular frequency average power model b3 b2 bl behaviour bl b3 bl b4 BLOCK Logic braking resistor capacitor Chapter commutating angle components computer memory CONDUCTING VALVES controlling unit converter circuit converter-inductor unit Corresponding Matrices differential equations discontinuity dynamic braking Exciter/AVR fault Figure 2.l Figure 4.l0 firing angle firing delay angle formulation fundamental frequency harmonics Inductive Load inductor infinite bus initial instantaneous power model interval number inverter LIST OF ILLUSTRATIONS mathematical model Modes and Corresponding Modes or Interval Mutual inductances obtained ODD BLOCK odq odq odq odq-reference frame Park's transformation Phase Currents Waveforms Phase Plane Trajectories post-fault power system problem rad/sec radians reactance reactive power Referring to Figure Resistive Load shown in Figure simplified simulation Solve Equations Block Stator steady-state Step Change synchronous machine SYSTEM UNDER STUDY thesis thyristors tion torque transient stability studies transmission line variable Vector of odq-components