scispace - formally typeset
Search or ask a question
Proceedings ArticleDOI

Automatic Pulse Sequence Selector for Novel PWM Technique: FPGA LabVIEW Implementation

TL;DR: In this paper, an Automatic Pulse Sequence Selector (APSS) for the Novel PWM technique by using FPGA LabVIEW software is presented, where the pulse sequence selection is done by using the sample index generated by the reference sinusoidal wave.
Abstract: Because of its high computation speed, shorter Because of its high computation speed, shorter design period, and higher density, the use of Field Programmable Gate Array (FPGA) has gained a lot of attention in the design and practical implementation of PWM (Pulse width modulation) techniques for MLI (Multilevel Inverter) structures. PWM techniques are designed to reduce switching losses, voltage stress of switches, total harmonic distortion (THD) and to increase the number of output voltage levels of inverter structures. This paper presents an Automatic Pulse Sequence Selector (APSS) for the Novel PWM technique by using FPGA LabVIEW software. The pulse sequence selection is done by using the sample index generated by the reference sinusoidal wave. By the automatic selection of specific pulse sequences from the sequences, the output wave of the inverter structure will be closer to the reference sinusoidal wave. The THD of the inverter output wave will be less than compared to direct feeding of those pulses to MLI structures. Using MATLAB/Simulink, a simulation study is performed on developed MLI structures for the validation of the proposed design. Comparison between the FFT analysis of these inverter structures verifies the efficacy of the design.
References
More filters
Journal ArticleDOI
TL;DR: In this paper, a high-frequency link multilevel cascaded medium-voltage converter is proposed, which generates multiple isolated and balanced dc supplies for the converter, which inherently minimizes the voltage imbalance and common mode issues.
Abstract: Recent advances in solid-state semiconductors have led to the development of medium-voltage power converters (e.g., 6-36 kV) which could obviate the need for the step-up transformers of renewable power generation systems. The modular multilevel cascaded converters have been deemed as strong contenders for the development of medium-voltage converters, but the converters require multiple isolated and balanced dc supplies. In this paper, a high-frequency link multilevel cascaded medium-voltage converter is proposed. The common high-frequency link generates multiple isolated and balanced dc supplies for the converter, which inherently minimizes the voltage imbalance and common mode issues. An 11-kV system is designed and analyzed taking into account the specified system performance, control complexity, cost, and market availability of the power semiconductors. To verify the feasibility of the proposed system, a scaled down 1.73-kVA laboratory prototype test platform with a modular five-level cascaded converter is developed and explored in this paper, which converts a 210 V dc (rectified generator voltage) into three-phase 1 kV rms 50 Hz ac. The experimental results are analyzed and discussed. It is expected that the proposed new technology will have great potential for future renewable generation systems and smart grid applications.

262 citations

Journal ArticleDOI
TL;DR: A single-phase RS MLI topology is experimentally illustrated for different level generation using both fundamental and high switching frequency techniques which will help the readers to gain the utmost knowledge for advance research.
Abstract: Recently, multilevel inverters (MLIs) have gained lots of interest in industry and academia, as they are changing into a viable technology for numerous applications, such as renewable power conversion system and drives. For these high power and high/medium voltage applications, MLIs are widely used as one of the advanced power converter topologies. To produce high-quality output without the need for a large number of switches, development of reduced switch MLI (RS MLI) topologies has been a major focus of current research. Therefore, this review paper focuses on a number of recently developed MLIs used in various applications. To assist with advanced current research in this field and in the selection of suitable inverter for various applications, significant understanding on these topologies is clearly summarized based on the three categories, i.e., symmetrical, asymmetrical, and modified topologies. This review paper also includes a comparison based on important performance parameters, detailed technical challenges, current focus, and future development trends. By a suitable combination of switches, the MLI produces a staircase output with low harmonic distortion. For a better understanding of the working principle, a single-phase RS MLI topology is experimentally illustrated for different level generation using both fundamental and high switching frequency techniques which will help the readers to gain the utmost knowledge for advance research.

211 citations

Journal ArticleDOI
TL;DR: A new cascade switch-ladder multilevel inverter topology is presented which can generate a large number of output voltage levels and requires fewer numbers of components than other structures.
Abstract: In this paper, a new cascade switch-ladder multilevel inverter topology is presented which can generate a large number of output voltage levels. First, a fundamental switch-ladder multilevel inverter structure is described. Then, the structure of recommended cascade topology based on series connection of fundamental switch-ladder topologies is presented. To generate maximum number of levels with minimum number of switching elements, dc sources, and voltage on switches, the proposed cascade topology is optimized. Comparison results prove that the presented cascade topology requires fewer numbers of components. Also, the value of voltage rating on switches is less than other structures. Experimental results for two topologies are analyzed to verify the performance of the proposed topology.

180 citations

Journal ArticleDOI
TL;DR: This article updates and summarizes the recently developed multilevel topologies with a reduced component count, based on their advantages, disadvantages, construction, and specific applications, and proposes a comparative method with novel factors to take component ratings into account.
Abstract: Multilevel inverters (MLIs) have gained increasing interest for advanced energy-conversion systems due to their features of high-quality produced waveforms, modularity, transformerless operation, voltage, and current scalability, and fault-tolerant operation. However, these merits usually come with the cost of a high number of components. Over the past few years, proposing new MLIs with a lower component count has been one of the most active topics in power electronics. The first aim of this article is to update and summarize the recently developed multilevel topologies with a reduced component count, based on their advantages, disadvantages, construction, and specific applications. Within the framework, both single-phase and three-phase topologies with symmetrical and asymmetrical operations are taken into consideration via a detailed comparison in terms of the used component count and type. The second objective is to propose a comparative method with novel factors to take component ratings into account. The effectiveness of the proposed method is verified by a comparative study.

135 citations

Journal ArticleDOI
TL;DR: The proposed control strategies enable decoupled operation of the converter, provide maximum power point tracking capability at the generator side, grid code compliance at the grid side (including low-voltage ride-through control) and good steady state and dynamic performance for balancing the capacitor voltages in all the clusters.
Abstract: The nominal power of single wind energy conversion systems (WECS) has been steadily increasing, now reaching power ratings close to 10 MW. In the power conversion stage, medium-voltage power converters are replacing the conventional low-voltage back-to-back topology. Modular multilevel converters have appeared as a promising solution for multi-MW WECSs, due to their modularity and the capability to reach high nominal voltages. This paper discusses the application of the modular multilevel matrix converter to drive multi-MW WECSs. The modeling and control systems required for this application are extensively analyzed and discussed in this paper. The proposed control strategies enable decoupled operation of the converter, provide maximum power point tracking capability at the generator side, grid code compliance at the grid side (including low-voltage ride-through control) and good steady state and dynamic performance for balancing the capacitor voltages in all the clusters. Finally, the effectiveness of the proposed control strategy is validated using simulation and through experimental results obtained with a 27-power-cell prototype.

85 citations