scholarly journals Simulation and Design of Neutral Point Type Buck Converter

2020 ◽  
Vol 9 (3) ◽  
pp. 2767-2772
Keyword(s):  
Power Factor ◽  
Pulse Width ◽  
Pulse Width Modulation ◽  
Reference Signal ◽  
Buck Converter ◽  
Neutral Point ◽  
Input Current ◽  
Output Current ◽  
Unity Power Factor ◽  
Point Type

This paper presents the simulation and design of Neutral Point Type (NPT) converters that have been used to increase power factor near one (1) which is unity. The circuit of the simulation has been design using Simulink MATLAB. The circuit was set to 50 kHz to generate Pulse Width Modulation (PWM) with carrier signal and comparing it with the reference signal. By adjusting the capacitor in the main circuit, the result of the simulation shows that the input current and voltage were in phase which is unity power factor while the output current and voltage produced having a low ripple. Thus, the simulation shows that the Neutral Point Buck type converter is suitable for maximizing power factor close to unity (1).

scholarly journals Design and Simulation of a Single Phase Four Level Neutral Point Clamped Inverter

2019 ◽  
Vol 8 (2) ◽  
pp. 5285-5287
Keyword(s):  
Normal Mode ◽  
Pulse Width ◽  
Single Phase ◽  
Pulse Width Modulation ◽  
Reference Signal ◽  
Neutral Point ◽  
Half Cycle ◽  
Adjustment Strategy ◽  
Four Levels ◽  
Sinusoidal Pulse Width Modulation

In this paper, sinusoidal pulse width adjustment strategy for single stage four levels neutral point clamped inverter is proposed disposed of normal mode voltage. Sinusoidal pulse width modulation is much of the time utilized in modern applications. The gating sign are created by contrasting a sinusoidal reference signal and a triangular bearer sign of recurrence. The quantity of heartbeats per half-cycle relies upon the transporter recurrence

Optimal space vector pulse width modulation strategy of neutral point clamped three‐level inverter for output current ripple reduction

2017 ◽  
Vol 10 (12) ◽  
pp. 1638-1646 ◽  
Author(s):  
Wei Chen ◽  
Wenkai Dai ◽  
Zhiqiang Wang ◽  
Guozheng Zhang ◽  
Yan Yan ◽  
...  
Keyword(s):  
Pulse Width ◽  
Pulse Width Modulation ◽  
Neutral Point ◽  
Output Current ◽  
Space Vector ◽  
Ripple Reduction ◽  
Optimal Space ◽  
Current Ripple

Appropriate Switching State Selection to Avoid Sapacitor Imbalance in Five-Level NPC

2018 ◽  
Vol 9 (1) ◽  
pp. 276
Author(s):  
Kuthuri Narasimha Raju ◽  
Chandra Sekhar Obbu ◽  
Ramamoorthy M
Keyword(s):  
Pulse Width ◽  
Pulse Width Modulation ◽  
Reference Signal ◽  
Neutral Point ◽  
Modulation Scheme ◽  
Zero Crossings ◽  
Load Demand ◽  
Capacitor Voltage ◽  
State Selection ◽  
Switching State

<p>An intrinsic problem with neutral point clamped (NPC) multilevel inverters (MLI) is unbalance of capacitor voltage. There are many mitigation techniques well established in the literature to balance the neutral point voltage for 3-level inverter. These techniques employ either Carrier based pulse width modulation (CBPWM), Space vector pulse width modulation (SVPWM) or hybrid of both the PWM techniques. Balancing becomes complicated as the level of the inverter increases due to addition of capacitor junctions. The imbalance in capacitor voltages may cause uneven voltage distribution among switching devices and sometimes may cause failure. It also increases harmonic content in its output waveform. This paper develops new modulation scheme for balancing capacitor voltages for Five-level inverter .The scheme is a hybrid PWM which is a combination of both CBPWM and SVPWM techniques. As per this scheme CBPWM is applied to meet the load demand and at the zero crossings of the reference signal, CBPWM is blocked and for one carrier cycle. During this SVPWM is applied with   appropriate switching state selection to neutralize the imbalance in capacitor voltage.</p>

scholarly journals Inverse sinusoidal pulse width modulation switched electric vehicles’ battery charger

2019 ◽  
Vol 9 (5) ◽  
pp. 3344 ◽  
Author(s):  
Saurav Das ◽  
Khosru M. Salim ◽  
Dhiman Chowdhury ◽  
Mohammed Mahedi Hasan
Keyword(s):  
Electric Vehicles ◽  
Power Factor ◽  
Pulse Width ◽  
Pulse Width Modulation ◽  
Buck Converter ◽  
Duty Ratio ◽  
Battery Charger ◽  
Charging System ◽  
Switching Converter ◽  
Sinusoidal Pulse Width Modulation

<p>This paper documents an efficient, cost-effective and sustainable grid-connected electric vehicles (EVs) battery charger based on a buck converter to reduce the harmonics injected into the mains power line. To utilize the switching converter as an effective power factor controller (PFC), inverse sinusoidal pulse width modulation (ISPWM) signals have been applied. A mathematical relationship between the sending-end power factor and the duty ratio of the switching converter has been presented. To ensure the sustenance of the proposed method, a simulation model of the proposed battery charging system has been tested on PSIM simulation platform. The simulation results yield to a lossless charging system with a sending-end power factor close to unity. An experimental testbed comprising a 60 V battery bank of 100 A-h capacity with a charging current of 7 A has been generated. The laboratory assessments present an 88.1% efficient charging prototype with a resultant sending-end power factor of 0.89. The laboratory framework concerns with the comparative analysis of the power efficiency, sending-end power factor and lines current total harmonic distortion (THD) values obtained for different charging methods and the evaluations corroborate the reliability of the proposed work.</p>

scholarly journals Reduction in Current THD of Grid Parallel Inverters Using Randomized PR Control

2017 ◽  
Vol 8 (1) ◽  
pp. 290 ◽  
Author(s):  
S. Salimin ◽  
S. A. Zulkifli ◽  
M. Armstrong
Keyword(s):  
Power Factor ◽  
Experimental Validation ◽  
Switching Scheme ◽  
Output Current ◽  
Unity Power Factor ◽  
Current Harmonics ◽  
Passive Filter ◽  
Current Controller ◽  
The Right ◽  
Inverter Topology

In grid connected system, unity power factor current injection into the grid is vital. This can be achieved by choosing the right inverter topology, passive filter components, current controllers, and PWM switching scheme. This paper compares the output current harmonics profile between when using the conventional proportional resonant (PR) current controller and when using the modified PR current controller. By applying the latter technique, via experimental validation using TMS320F2812, the THD of the injected grid current in a parallel connected inverters system is improved.

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