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All Journal International Journal of Applied Power Engineering (IJAPE) Buletin Ilmiah Sarjana Teknik Elektro
Mohammed Moanes Ezzaldean Ali
University of Technology-Iraq
Electrical & Electronics Engineering

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Design of MMC-STATCOM Controller Using an Adaptive PID Controller Supported by a Grey Model Mohammed Moanes Ezzaldean Ali; Qusay Shebeeb Kadhim
Buletin Ilmiah Sarjana Teknik Elektro Vol. 8 No. 1 (2026): February
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/biste.v8i1.15426

Abstract

The Static Synchronous Compensator (STATCOM) is recognized as one of the most advanced and effective technologies within the Flexible AC Transmission Systems (FACTS) family, due to its rapid dynamic response and high efficiency in regulating reactive power flow. However, conventional two- and three-level STATCOM topologies suffer from limited scalability and high harmonic distortion. This paper addresses these challenges by employing a STATCOM based on Modular Multilevel Converter (MMC). The significant contribution of this work is the introduction of a novel control strategy for MMC-STATCOM systems which is an adaptive PID controller integrated with a Grey Prediction Model. In the proposed scheme, the PID gains are continuously adapted based on predicted future error values obtained from the GM(1,1) grey model, rather than instantaneous measured errors, enabling proactive compensation under dynamic operating conditions. The performance of the proposed controller is evaluated in MATLAB/Simulink environment and by using a 12 MVA, 34.5 kV MMC-STATCOM system with a full-bridge topology consisting of 22 submodules per phase. Under balanced load condition, the results demonstrated that the adaptive grey-PID controller significantly reduced the total harmonic distortion (THD) of the grid current by 43.75% as compared to conventional PI controller. Under a severe unbalanced load condition, the total harmonic distortion of the grid current is reduced by 33.42%. Furthermore, the proposed controller successfully restored balance to the grid voltage and current and maintained a stable DC-link voltage under unbalanced load conditions. Additionally, the suggested controller achieved a fast-settling time of 0.04 s during transient conditions, this conclusively demonstrates its superior robustness and rapid dynamic response. Despite the additional computational effort introduced by the grey predictor model, it remains suitable for real time implementation due to its low order structure and limited data window.
Performance analysis of un-equal rotor and stator length switched reluctance motor Mohammed Moanes Ezzaldean Ali; Nadheer A. Shalash
International Journal of Applied Power Engineering (IJAPE) Vol 15, No 3: September 2026
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijape.v15.i3.pp1190-1199

Abstract

The performance of the SRM motor is influenced by several design parameters, including the lengths of the rotor stack and stator stack. Typically, the SRM is designed with equal rotor and stator lengths. However, there are some limited exceptions where the motor has a rotor that is longer or shorter than the stator; such a motor can achieve a reduction in one or more of the following: iron loss, copper loss, weight, inertia, and cost. To evaluate the performance of the SRM when the stator and rotor lengths are unequal, a 3D-model of the 6/4 SRM was developed using Ansys Motor-CAD software. In this work, two cases were investigated: the first case involved configurations where the stator was shorter than the rotor, and the second case involved configurations where the rotor was shorter than the stator. In both cases, other motor dimensions and variables were held constant. The simulation results show that certain performance indicators of the motor are not negatively affected, where they remain almost constant or even change positively, while other performance indicators are negatively changed, these changes are not significant when the differences between the stator and rotor lengths are within 10%. The cases of unequal length of stator and rotor can be considered as a new option that is manipulated to achieve the optimal design of the SRM, especially for low cost, low inertia, and high-speed applications.
Co-Authors Nadheer A. Shalash Qusay Shebeeb Kadhim