scholarly journals Application of Simplified Neutral Point Clamped Multilevel Converter in a Small Wind Turbine

2014 ◽  
Vol 5 (1) ◽  
pp. 5-10 ◽  
Author(s):  
Pawel Mlodzikowski ◽  
Adam Milczarek ◽  
Mariusz Malinowski
Keyword(s):  
Low Cost ◽  
Direct Torque Control ◽  
Synchronous Generator ◽  
Neutral Point ◽  
Torque Control ◽  
Multilevel Converters ◽  
Laboratory Setup ◽  
Power Modules ◽  
Control Scheme ◽  
Clamped Converter

Abstract In low power distributed generation systems low cost together with the energy quality requirements are a key element. It is known that quality of voltage waveforms generated from multilevel converters is better in comparison with those from two-level. Due to advancements in power electronics and microcontrollers, multilevel converters are being built with the use of integrated power modules thus this type of converters are getting more compact in size. This paper investigates performance of a derivation from the most popular multilevel topology - a neutral point clamped converter (NPC). Applying the idea for simplifying the topology by reducing the number of switches (what came from drives) this NPC converter is capable of bidirectional AC/DC/AC operation. For the AC/DC part two schemes are tested: Direct Torque Control Space Vector Modulated and Field Oriented Control but for the DC/AC part a control scheme utilizing the proportional-resonant controller was chosen. Laboratory setup was based on a permanent magnet synchronous generator with control and acquisition completed with the help of dSpace 1005 control box. Experimental verification shows that system operates properly.

Simulink Implementation of Direct Torque Control Drive for Induction Machines

2011 ◽  
Vol 367 ◽  
pp. 89-96
Author(s):  
U. Zangina ◽  
H.N. Yahaya ◽  
M. Aminu ◽  
Z.O. Niyi
Keyword(s):  
Control Method ◽  
Direct Torque Control ◽  
Induction Machine ◽  
Induction Machines ◽  
Torque Control ◽  
Control Technique ◽  
Computational Time ◽  
Suitable Alternative ◽  
Control Scheme ◽  
Transient Operations

Direct Torque Control (DTC) has emerged over the last two decades as a suitable alternative to the well-known Field Oriented Control (FOC) or vector control technique for electric drives mainly due to its simple control scheme, low computational time and reduced parameter sensitivity. In this paper, speed control of an induction machine based on DTC strategy has been developed and a comprehensive study is presented. The performance of the control method has been demonstrated by simulations using the Matlab/Simulink software package. Several numerical simulations have been carried out in steady state and transient operations.

scholarly journals Study and Implementation of a Cost-Effective 3L-Active Rectifier for DC Collection in WECS

2019 ◽  
Vol 118 ◽  
pp. 02065
Author(s):  
Muhammad Luqman ◽  
Gang Yao ◽  
Lidan Zhou ◽  
Di Yang ◽  
Anil Lamichhane
Keyword(s):  
Low Cost ◽  
Cost Effective ◽  
Cost Comparison ◽  
Multilevel Converters ◽  
Wind Generators ◽  
Active Rectifier ◽  
Vienna Rectifier ◽  
Three Phase ◽  
Control Scheme ◽  
Parallel Configuration

Power electronic converters are widely used in wind energy conversion system (WECS) applications. Therefore, with the increasing manufacturing capacity of multi-MW wind generators, multi-level converters, or parallel configuration of converters are becoming more attractive solutions towards DC collection from the wind generator. Among the multilevel converters, three-level full-scale neutral point diode clamped (3L-NPC) converter are using extensively for such applications in order to reduce the voltage stress on the semiconductor devices. In this article, a comparative study based on several devices used by NPC, capacitor clamped (CC) as well as Vienna rectifier has been done. Furthermore, their estimated cost comparison and complexity of control switches have been debated. By keeping in view the merits and demerits of these rectifiers, a low cost three-level active rectifier having a smaller number of active switches with a simple control scheme have been implemented. Considering a three-phase electric grid as a generated source, a 2.2KW low-cost three-level Vienna rectifier is simulated using MATLAB/Simulink. DSP (TMS320F28335) based experimental results ratify the simulated circuit with THD<5%.

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