@article{Smail2025, 
author = {Hassen Smail and Mostafa Kamel Smail and Abdelhak Goudjil},
title = {Efficiency Enhancement and Cost Reduction through Speed Optimization of Two-regime Generator Set with Three-stage Synchronous Alternator},
year = {2025},
journal = {Chinese Journal of Electrical Engineering},
volume = {11},
number = {1},
pages = {194-205},
keywords = {Variable-speed generators, permanent-magnet generator, two-regime generator, PID controller},
url = {https://www.sciopen.com/article/10.23919/CJEE.2025.000106},
doi = {10.23919/CJEE.2025.000106},
abstract = {Variable-speed generators (VSG) offer numerous benefits over fixed-speed generators. These advantages include significant fuel savings, reduced noise emissions, and extended engine lifespan. However, VSGs have a major drawback: their high manufacturing cost owing to the expensive permanent-magnet generators (PMGs) commonly used in these generators, as well as the large size of the power electronics section, which has the same power rating as the generator itself. A solution to reduce the initial investment cost by introducing a two-regime generator (TRG) is proposed. The first mode operates at a constant speed for loads exceeding 50%, without the need for a converter. The second mode operates at variable speeds for loads below 50% using a converter that reduces its power by 50%, thus decreasing the investment cost. Additionally, the cost can be further reduced by replacing the PMG with a brushless synchronous generator. The controller employed in this study is a two-loop proportional-integral-derivative controller that exhibits favorable dynamics and compensates for dead times and parameter variations. TRG have shown a significant reduction in cost compared to VSG while retaining the advantages of the latter.}
}