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RISS 인기검색어
- 검색키워드
- 저자 : Bharatiraja Chokkalingam (검색결과 3 건)
- 무료
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Bharatiraja Chokkalingam,Mahajan Sagar Bhaskar,Sanjeevikumar Padmanaban,Vigna K. Ramachandaramurthy,Atif Iqbal 전력전자학회 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.3
Multilevel Inverters (MLIs) are widely used in medium voltage applications due to their various advantages. In addition, there are numerous types of MLIs for such applications. However, the diode-less 3-level (3L) T-type Neutral Point Clamped (NPC) MLI is the most advantageous due to its low conduction losses and high potential efficiency. The power circuit of a 3L T-type NPC is derived by the conventional two level inverter by a slight modification. In order to explore the MLI performance for various Pulse Width Modulation (PWM) schemes, this paper examines the operation of a 3L (five level line to line) T-type NPC MLI for various types of Multi-Carriers Pulse Width Modulation (MCPWM) schemes. These PWM schemes are compared in terms of their voltage profile, total harmonic distortion (THD) and conduction losses. In addition, a 3L T-type NPC MLI is also compared with the conventional NPC in terms of number of switches, clamping diodes, main diodes and capacitors. Moreover, the capacitor-balancing problem is also investigated using the Neutral Point Fluctuation (NPF) method with all of the MCPWM schemes. A 1kW 3L T-type NPC MLI is simulated in MATLAB/Simulink and implemented experimentally and its performance is tested with a 1HP induction motor. The results indicate that the 3L T-type NPC MLI has better performance than conventional NPC MLIs.
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Chokkalingam, Bharatiraja,Bhaskar, Mahajan Sagar,Padmanaban, Sanjeevikumar,Ramachandaramurthy, Vigna K.,Iqbal, Atif The Korean Institute of Power Electronics 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.3
Multilevel Inverters (MLIs) are widely used in medium voltage applications due to their various advantages. In addition, there are numerous types of MLIs for such applications. However, the diode-less 3-level (3L) T-type Neutral Point Clamped (NPC) MLI is the most advantageous due to its low conduction losses and high potential efficiency. The power circuit of a 3L T-type NPC is derived by the conventional two level inverter by a slight modification. In order to explore the MLI performance for various Pulse Width Modulation (PWM) schemes, this paper examines the operation of a 3L (five level line to line) T-type NPC MLI for various types of Multi-Carriers Pulse Width Modulation (MCPWM) schemes. These PWM schemes are compared in terms of their voltage profile, total harmonic distortion (THD) and conduction losses. In addition, a 3L T-type NPC MLI is also compared with the conventional NPC in terms of number of switches, clamping diodes, main diodes and capacitors. Moreover, the capacitor-balancing problem is also investigated using the Neutral Point Fluctuation (NPF) method with all of the MCPWM schemes. A 1kW 3L T-type NPC MLI is simulated in MATLAB/Simulink and implemented experimentally and its performance is tested with a 1HP induction motor. The results indicate that the 3L T-type NPC MLI has better performance than conventional NPC MLIs.
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Design of a Novel Boomerang Trajectory for Sliding Mode Controller
Kamalesh MS,Senthilnathan Nattuthurai,Bharatiraja Chokkalingam 제어·로봇·시스템학회 2020 International Journal of Control, Automation, and Vol.18 No.11
Sliding Mode Controllers (SMC) is widely known for its robustness and controllability for a non-linear system during transient conditions. The main advantage of SMC is that of sliding a control variable along the trajectory and converges to zero or nearest to zero and make the system to attain a stable condition. Various methodologies and approaches like discontinuous controllers, second-order sliding modes, twisting algorithms, etc. are available for the SMC implementation. However, every algorithm is facing the problem of convergence and error tracking in a finite amount of time. The primary purpose of this paper is to formulate and design an SMC with a new trajectory which overcomes the drawback of the existing methodologies. This paper proposes a novel boomerang trajectory, which omits the reaching phase and follows a semi-elliptical and semi-circular path for a quick convergence. SMC with boomerang trajectory is analyzed for its stability at transient conditions, and the results show significant improvement in terms of convergence time when compared to the existing trajectories and also it is asymptotically stable. The entire system is simulated in Matlab / Simulink and the same prototypical setup has been designed, and implemented for evaluation purpose using dSPACE-MicroLabBox-ACE-DS1202 platform.
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