Aislamiento poscigótico en Neoleucinodes elegantalis

Several opportunities can be delivered from this research study for future works:

1. Simulation model: For the purpose of simplicity, some parameters have been omitted in the sub-models. For an example, in the drivetrain model, only rotor and generator inertias have been considered in Equation (3-15) and (3-16). For a more detailed model, study can be investigated further by considering the stiffness and damping in the equations. Also, the developed model could be further studied by considering two- or additional- mass in the drive train model, with nonlinearities included in the system. This study has only considered the single mass of the drive train model. Besides, an additional of power converter model may be included in the modeling system in the future work where the control side of the grid side converter can be comprised. Also, with grid side converter, the issues of active and reactive power control, the power quality issue, the network faults and the complete operational issues can be investigated while considering the total potential of SRVSWT.

2. IMC-PI-IP controller: During IMC designing, the first-order filter has been used in the second step as written in Equation (4-24) on page 132. Another

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approach that possibly could improve in the estimation of PI parameter values based on the IMC design in the future is by use the higher-order filter of _(𝑠+𝜆)1 _𝑛 e.g., n > 1. Also, in this study, to estimate the PI parameter values, the first- order plus time delay (FOPTD) approach was used. In the future, the effectiveness of the proposed SRVSWT system could be tested and compared with the second-order plus time delay (SOPTD) approach. Besides, IMC-PID based with filter also could be investigated further replacing the IMC-PI and IMC-PI-IP controllers. Application of other control algorithms in the SRVSWT system e.g., gain-scheduling approach, genetic algorithm, and detailed/advanced SLIVC model algorithm.

3. IP Parameter Tuning Method: There is no explicit tuning method has been proposed in tuning the IP controller. This is still an open issue. The proposed method shows good tracking properties particularly for the speed controller. It showed, by simulation, the power peaking during early rated wind speed was improved by smoothing the generator speed response. The results, however, could be further be investigated by performing some possible analytical analysis of how system stability can be improved. Improvement during tuning also possibly could be achieved by considering several switching methods with an IP controller e.g., bumpless switch.

4. Performance analysis: Performance analysis has been measured using sensitivity function. In the future, performance analysis can be confirmed by performing frequency response analysis where the stability and robustness could be measured using details of gain and phase margins. Besides, the output and input performance of the step change also has been performed to measure system performance. In this study, IAE was used to measure output performance meanwhile TV value was used to measure input performance, as explained in Section 4.5.2. The results for the output performance, however, could be further be explored by considering other measurement approach such as integral-square error (ISE), least-square error (LSE) and least- absolute error (LAE).

5. Validation on a real machine: The identification algorithms and controllers executed in this simulation studies can be tested and validated in the real SRVSWT plant.

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APPENDIXES Appendix 3A

𝐶𝑝− 𝜆 curve taken from [115].

Appendix 3B

Estimated generator torque-speed characteristic curve taken from [115]

0 0.1 0.2 0.3 0.4 0.5 0 2 4 6 8 10 12 14 16 18 Po w er Coe fficie n t

Tip Speed Ratio

Bladed Simulation Manufacturer's Datasheet 0 20 40 60 80 100 120 140 160 1000 1100 1200 1300 1400 1500 1600

Tor

que (

Nm)

Speed (rpm)

P



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LIST OF PUBLICATIONS Journals

1. N. Rosmin, S. Samsuri, M.Y. Hassan, A.H. Musta’amal and F. Hussin (2013) “Wind Turbine Power Limitation using Power Loop: Comparison between Proportional-Integral and Pole Placement Method,” International Journal of Education and Research, volume 1, Issue 10, page 1-15.

2. N. Rosmin, S. Samsuri, M.Y. Hassan and H.A. Rahman (2012) “Power Control for a Small- sized Stall-regulated Variable-speed Wind Turbine using power loop and speed loop control method”.Archive Des Sciences Journal, Volume 65, Issue 7, page 162-174.

3. N. Rosmin, S. Samsuri, M.Y. Hassan, A.H. Musta’amal and H.A. Rahman (2012) “Power Control for a Small-sized Stall-regulated Variable-speed Wind Turbine using speed loop control method”. Archive Des Sciences Journal, Volume 65, Issue 7, page 567-581.

4. N. Rosmin and S.J.Watson (2011) “Performance analysis of indirect vector control algorithm for small-sized wind turbine induction generator”, Journal of Energy Procedia,

Elsevier, Volume 14, page 964-970.

5. N.Rosmin, S.J.Watson and M.Tompson (2010) “Power Limitation at High Wind Speed for a Variable Speed Fixed Pitch Wind Turbine using Close-Loop Scalar Control,” Renewable

Energy & Power Quality Journal (RE & PQJ), No. 8, April 2010.

Journals in submission:

1. N. Rosmin and S.J.Watson (2014) Review of Fixed-Pitch Wind Turbine Control: Principles, Progress and Challenges. Renewable & Sustainable Energy Reviews, Elsevier.

2. N. Rosmin and S.J.Watson (2014) Power Control for a Stall-regulated Variable-speed Wind Turbine using Internal Model Control (IMC) Design. Renewable Energy, Elsevier.

3. N. Rosmin and S.J.Watson (2014) Fixed-Speed Stall-Regulated Wind-Turbine (FSSRWT) System: modelling approach. Energies journal.

4. N. Rosmin and S.J.Watson (2014) Fixed-Speed Stall-Regulated Wind-Turbine (FSSRWT) System: validation approach. Applied Energy, Elsevier.

5. N. Rosmin and S.J.Watson (2014) Power Limitation at High Wind Speed for a Variable- Speed Fixed-Pitch Wind Turbine using Internal Model Control (IMC) Design. IET

Renewable Power Generation, Elsevier.

6. N. Rosmin and S.J.Watson (2014) Integral Proportional (IP) Tuning for speed control applied to a Fixed-Pitch Wind Turbine. IET Control Theory and Applications.

Conference Proceedings

1. Rosmin, N, Watson, S.J. and Mustaamal, A. H (2013) ” Power Optimization for a Variable- speed Stall-regulated Wind-turbine using Scalar Control.” 4th _{International Conference on}

Clean Electrical Power (ICCEP 2013), 11-13th _{June 2013, Alghero, Sardinia, Italy.}

2. Rosmin, N, Manaf, M. S. A, Mustaamal, A. H and Hassan, M. Y (2013) “Does Tidal Energy using Double-Emptying Scheme has a Good Prospect in Malaysia?.” 1st Malaysian Ocean

Renewable Energy Symposium 2013 (MORES 2013), 6th June 2013, Maritime Centre,

Putrajaya, Malaysia.

3. Rosmin, N, Watson, S.J. and Mustaamal, A. H (2013) ” Stall-regulated Variable-speed Wind Turbine Simulink Model.” IEEE International Power Engineering and Optimization Conference