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RISS 인기검색어
- 검색키워드
- 저자 : Nalin Kant Mohanty (검색결과 3 건)
- 무료
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Elangovan P.,Nalin Kant Mohanty 전력전자학회 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.1
An active front end (AFE) is required for a three-phase induction motor (IM) fed by a voltage source inverter (VSI), because of the increasing need to derive quality current from the utility end without sacrificing the power factor (PF). This study investigates a proportional-plus-integral (PI) controller based AFE topology that uses a super-lift converter (SLC). The significance of the proposed SLC, which converts rectified AC supply to geometrically proceed ripple-free DC supply, is explained. Variations in several power quality parameters in the intended IM drive for 0% and 100% loading conditions are demonstrated. A simulation is conducted by using MATLAB/Simulink software, and a prototype is built with a field programmable gate array (FPGA) Spartan-6 processor. Simulation results are correlated with the experimental results obtained from a 0.5 HP IM drive prototype with speed feedback and a voltage/frequency (V/f) control strategy. The proposed AFE topology using SLC is suitable for three-phase IM drives, considering the supply end PF, the DC-link voltage and current, the total harmonic distortion (THD) in supply current, and the speed response of IM.
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A Non-modular Matrix Structure for Component Count Waning in Multilevel Inversion
Kannan Chandrasekaran,Mohanty Nalin Kant 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.1
Recently the matrix structure has become an astute converter topology for ac–ac power conversion systems. The supersession of the conventional two stage, back-to-back voltage source converters by the matrix arrangement of bi-directional semiconductor switches has rendered the merits such as single stage conversion, elimination of bulky dc-link electrolytic capacitors, improved input side performance matrices, increased power density etc. The matrix structure can be treated as a versatile structure, which has a straddling scope in power conversion systems such as multiport converters and multi level voltage source inverters. Albeit the multilevel inverter (MLI) structure is under a diligent research, still the component count waning is the thrust area. This paper attempts to exploit the matrix structure to arrive at a reduced switch count MLI topology. The idea of the suggested modifi ed matrix structure MLI (MMSMLI) is involving switches in columns and separate DC sources (SDCs) in the row links, through which the addition and subtraction amid the SDCs are made easy in the asymmetrical operation, and hence the creation of more output levels are possible. In addition the introduction of the cross switching in the matrix structure helps in curtailing the number of switching devices in the current conduction path at almost all output voltage levels. The feasibility and operation of the MMSMLI are exemplifi ed in MATLAB R2017b software using the pertinent multicarrier pulse width modulation. Further the corroboration is done from a proof-of-concept laboratory scale prototype. The results emboldened the usage of the MMSMLI for traction applications and other space constrained low and medium voltage applications.
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Harmonic Current Reduction Analysis of Traditional PI and Enhanced FoPID Controller-Based MSALC
Muralikrishnan Gopalakrishnan,Mohanty Nalin Kant 대한전기학회 2021 Journal of Electrical Engineering & Technology Vol.16 No.4
Harmonics generated by the nonlinear loads and unbalancing of loads are serious concerns regarding the power quality of the distribution system. An Enhanced technique to scale down current harmonics, balance loads by MSALC (Modifi ed Shunt Active Line Conditioner) using traditional PI and enhanced FoPID (Fractional order PID) control device is presented in the article. Performance of MSALC using traditional PI and enhanced FoPID is tested for various load conditions and dynamic load changing characteristics were performed. Using MATLAB/Sim software the outcomes are verifi ed. Comparatively harmonic current reduction between traditional PI and enhanced FoPID was discussed. Enhanced FoPID control device-based MSALC found to have superior performance than the traditional PI-based MSALC.
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