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Fig. 15. Response of speed deviation for a six-cycle three- phase fault disturbance at heavy loading condition.

Figure 15 Response of speed deviation for a six-cycle three- phase fault disturbance at heavy loading condition.

Related Figures (19)

Fig. 1. Single-machine infinite bus power system with SSSC.
Fig. 1. Single-machine infinite bus power system with SSSC.
Fig. 2. Single line diagram of the control system of SSSC. Comparison of Particle Swarm Optimization and the Genetic Algorithm in the Improvement of Power System Stability~
Fig. 2. Single line diagram of the control system of SSSC. Comparison of Particle Swarm Optimization and the Genetic Algorithm in the Improvement of Power System Stability~
Fig. 3. Lead-lag structure of the SSSC-based controller. as a high-pass filter, with the time constant 7w high enough o allow signals associated with oscillations in input signal oO pass unchanged. From the viewpoint of the washout function, the value of Jw is not critical and may be in the range of 1 to 20 seconds [26]. The phase compensation block (time constants 77, 72 and 73, T4) provides the ap- propriate phase-lead characteristics to compensate for the phase lag between the input and output signals. In Fig. 3, Vqref represents the reference injected voltage as desired by the steady-state power flow control loop. This loop acts quite slowly in practice. Therefore, in the present study, Vqref is assumed to be constant during a large disturbance transient period. The desired value of compensation is ob- tained according to the change in SSSC injected voltage AVq which is added to Vqref. mn 4 _ 44
Fig. 3. Lead-lag structure of the SSSC-based controller. as a high-pass filter, with the time constant 7w high enough o allow signals associated with oscillations in input signal oO pass unchanged. From the viewpoint of the washout function, the value of Jw is not critical and may be in the range of 1 to 20 seconds [26]. The phase compensation block (time constants 77, 72 and 73, T4) provides the ap- propriate phase-lead characteristics to compensate for the phase lag between the input and output signals. In Fig. 3, Vqref represents the reference injected voltage as desired by the steady-state power flow control loop. This loop acts quite slowly in practice. Therefore, in the present study, Vqref is assumed to be constant during a large disturbance transient period. The desired value of compensation is ob- tained according to the change in SSSC injected voltage AVq which is added to Vqref. mn 4 _ 44
Fig. 4. Deception of velocity and position updates in the particle swarm optimization technique.
Fig. 4. Deception of velocity and position updates in the particle swarm optimization technique.
Fig. 5. Flowchart of the particle swarm optimization algo- rithm. Comparison of Particle Swarm Optimization and the Genetic Algorithm in the Improvement of Power System Stability~
Fig. 5. Flowchart of the particle swarm optimization algo- rithm. Comparison of Particle Swarm Optimization and the Genetic Algorithm in the Improvement of Power System Stability~
Fig. 6. Flowchart of the genetic algorithm
Fig. 6. Flowchart of the genetic algorithm
Table 1. Parameters used for PSO and GA Table 2. Optimized Parameters Obtained by PSO and GA
Table 1. Parameters used for PSO and GA Table 2. Optimized Parameters Obtained by PSO and GA
Fig. 8. Variation of the computational time for PSO and GA with generation. Fig. 7. Convergence of the objective function for the PSO and GA optimization techniques.
Fig. 8. Variation of the computational time for PSO and GA with generation. Fig. 7. Convergence of the objective function for the PSO and GA optimization techniques.
Fig. 10. Response of speed deviation for a five-cycle three- phase fault disturbance at nominal loading condi- tion.
Fig. 10. Response of speed deviation for a five-cycle three- phase fault disturbance at nominal loading condi- tion.
Fig. 9. Response of the power angle for a five-cycle three- phase fault disturbance at nominal loading condi- tion.
Fig. 9. Response of the power angle for a five-cycle three- phase fault disturbance at nominal loading condi- tion.
Fig. 13. Response of the line power flow for a five-cycle three-phase fault disturbance at nominal loading condition.
Fig. 13. Response of the line power flow for a five-cycle three-phase fault disturbance at nominal loading condition.
Fig. 14. Response of the power angle for a six-cycle three- phase fault disturbance at heavy loading condition.
Fig. 14. Response of the power angle for a six-cycle three- phase fault disturbance at heavy loading condition.
Fig. 17. Response of line power flow for a six-cycle three- phase fault disturbance at heavy loading condition. Fig. 16. Response of terminal voltage for a six-cycle three- phase fault disturbance at heavy loading condition.
Fig. 17. Response of line power flow for a six-cycle three- phase fault disturbance at heavy loading condition. Fig. 16. Response of terminal voltage for a six-cycle three- phase fault disturbance at heavy loading condition.
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