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Abstrak :
Braking conditions could generate energy that can be reused again for energy conservation. The purpose of regenerative braking in electric vehicles is to use the excess energy from the braking system and convert it to electricity and then store it for further utilization. But when the back current is too high it can cause overvoltage which can result in broken electrical components. Therefore, a voltage limiter is required to limit the q-axis stator current which keeps DC link voltage at a certain value. However, this voltage limiter causes a decrease in the braking torque and actual speed that does not follow the reference speed. To overcome this problem, the mechanical brake should be combined with a regenerative brake in electric vehicles, so the vehicle speed can always follow the reference speed. A new control scheme for combining a regenerative braking system with mechanical braking system to overcome the overvoltage problem in electric vehicle is proposed in this paper. Using a combination between regenerative and mechanical braking, the actual speed could follow the reference speed even when voltage limiter is active. The effectiveness of the control scheme is validated through simulation. Actual speed could follow the speed reference with delays in about 1.5s-2.5s and by varying gain in IP controller, the delay could be reduced to become about 1 second, so the braking will be more accurate.

Abstrak :
Pembangkit Listrik Tenaga Mikro Hidro (PLTMH) merupakan salah satu topik yang menarik untuk dilakukan terutama di Indonesia. Dalam skripsi ini akan dibahas mengenai analisa kestabilan sistem pengendalian tegangan eksitasi pada PLTMH. Pengendalian tegangan eksitasi pada sistem ini dapat dilakukan dengan cara mengendalikan Mesin Sinkron Magnet Permanen (PMSM) dengan algoritma tertentu sehingga tegangan pada DC-link sistem dapat terkendali. Tanpa mengetahui spesifikasi dari parameter sistem yang tepat, maka kemungkinan besar akan terjadi ketidakstabilan. Oleh karena itu pada kesempatan ini akan dilakukan permodelan, simulasi, serta analisa kestabilan sistem secara matematis sehingga bisa didapat spesifikasi parameter agar sistem tetap stabil. ...... Micro Hydro Power Plant is one of the interesting topic to be researched especially in Indonesia. This final project will be discussing about the stability analysis on control system of excitation voltage on Micro Hydro Power Plant. The control of this voltage can be achieved by controlling the Permanent Magnet Synchronous Machine (PMSM) with particular algorithm so the voltage on DC-link part of the system can be controlled. Without knowing the exact specification of system parameters, the system will be most likely unstable. Therefore, on this occasion the system stability will be modelled, simulated, and mathematically analyzed so the parameter specification for the stable system can be obtained.