The authors discuss high-voltage power conversion. Conventional series connection and three-level voltage source inverter techniques are reviewed and compared. A novel versatile multilevel commutation cell is introduced: it is shown that this topology is safer and more simple to control, and delivers purer output waveforms. The authors show how this technique can be applied to either choppers or voltage-source inverters and generalized to any number of switches.<<ETX>>

Multi-level conversion : high voltage choppers and voltage-source inverters

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Guidance And Control Of Ocean Vehicles

There has recently been significant interest in feedback stabilization problems over communication channels, including several with bit rate limited feedback. Motivated by considering one source of such bit rate limits, we study the problem of stabilization over a signal-to-noise ratio (SNR) constrained channel. We discuss both continuous and discrete time cases, and show that for either state feedback, or for output feedback delay-free, minimum phase plants, there are limitations on the ability to stabilize an unstable plant over an SNR constrained channel. These limitations in fact match precisely those that might have been inferred by considering the associated ideal Shannon capacity bit rate over the same channel.

Author's Reply to Comments on Feedback Stabilization Over Signal-to-Noise Ratio Constrained Channels

Clean and environment-friendly energy harvesting are of prime interest today as it is one of the key enablers in achieving the Sustainable Development Goals (SDGs) as well as accelerates social progress and enhances living standards. India, the second-most populous nation with a population of 1.353 billion, is one of the largest consumers of fossil fuels in the world which is responsible for global warming. An ever-increasing population is projected until 2050, and consequently, the energy demand in the upcoming decades will be co-accelerated by the rapid industrial growth. The Ministry of New and Renewable Energy (MNRE) with the support of National Institution for Transforming India (NITI) Aayog is working to achieve the Indian Government's target of attaining 175 GW through renewable energy resources. Many Indian states are currently increasing their renewable energy capacity in an objective to meet future energy demand. The review paper discusses in-depth about the three Indian states, namely Karnataka, Gujarat, Tamil Nadu, which pioneers the renewable energy production in India. The global energy scenario was discussed in detail with Indian contrast. Further, the barriers to the development of renewable energy generation and policies of the Indian government are discussed in detail to promote renewable energy generation throughout India as well as globally since the challenges are similar for other nations. This study analyzed various prospects of the country in renewable energy which has been done in a purpose to help the scholars, researchers, and policymakers of the nation, as it gives an insight into the present renewable energy scenario of the country.

/pdf/a-comprehensive-review-on-renewable-energy-development-1ec239x6fp.pdf

A Comprehensive Review on Renewable Energy Development, Challenges, and Policies of Leading Indian States With an International Perspective

A Takagi-Sugeno (T-S) model is employed to represent a networked control system (NCS) with different network-induced delays. Comparing with existing NCS modeling methods, this approach does not require the knowledge of exact values of network-induced delays. Instead, it addresses situations involving all possible network-induced delays. Moreover, this approach also handles data-packet loss. As an application of the T-S-based modeling method, a parity-equation approach and a fuzzy-observer-based approach for fault detection of an NCS were developed. An example of a two-link inverted pendulum is used to illustrate the utility and viability of the proposed approaches

CORRESPONDENCE - Takagi-Sugeno Fuzzy-Model-Based Fault Detection for Networked Control Systems with Markov Delays

The present study designs a novel ∆Σ-based PID controller for controlling the rotor side converter (RSC) of a doubly-fed induction generator (DFIG) based wind energy conversion system (WECS). The proposed controller essentially uses ∆Σ modulators to represent the analogue signals in single-bit which is ideally suited for FPGA or application specific integrated circuit implementation and offers numerous advantages due to its inherent parallel nature. The performance of the controller is compared with various controllers including a conventional PID, Q and Dynamic Fuzzy-Q learning (DFQL) based intelligent controllers. The results of the simulation on WECS consists of 20 wind turbines and 20 DFIGs, illustrate that the ∆Σ based PID controller could perform better compared to conventional PID and Q-learning based controllers.

Design of ∆Σ Based PID Controller for Wind Energy Systems

The boost-switched capacitor inverter topology with reduced leakage current is highly suitable for distributed photovoltaic power generation with a transformerless structure. This paper presents a single-stage 5-level (5L) transformerless inverter with common ground (CG) topology for single-phase grid-connected photovoltaic application. A generalized version of the proposed topology is also presented. The proposed topologies are derived by combining the dc/dc boost converter and switched capacitor cell. The primary focus has been given to the 5L version of the proposed topology. The number of switch counts is reduced, the maximum voltage gain is four times, and the inrush current is suppressed due to the input inductor configuration. Also, the voltages across the switched capacitors (SCs) are self-balanced. The negative source terminal and the load are connected directly to suppress the leakage current. It is thoroughly compared with other recent CG-Type topologies to attest to the advantages of the proposed topology. The laboratory prototype is developed for 600 W with the maximum efficiency is 94.21%, and the maximum source current is not more than 25A. Further, the operation of the proposed topology is verified under dynamic loading conditions, and the results are presented. 

/pdf/common-ground-type-five-level-inverter-with-voltage-boosting-16ovm5x0.pdf

Common ground type five level inverter with voltage boosting for PV applications

A hysteresis motor is an inherently synchronous motor in which accuracy is more important than efficiency. The rotor is a smooth cylinder type made up of permanent magnet material having high hysteresis loss in its simplest form. We use a hysteresis ring around a non-magnetic material to reduce the rotor's weight, say aluminum. Rotor ring material handles the efficiency of the motor to some extent. This paper involves designing a three-phase hysteresis motor using the scrap material for rotor ring, i.e., hard magnetic material, a composition of aluminum, cast iron, and Nichrome, and provide an alternative to the material currently used for manufacturing hysteresis motor. Further, this paper proposes to reduce the motor's size and improve the hysteresis motor's efficiency.

Design and Implementation of Hysteresis Motor with Scrap Material Rotor Ring

Enhancing the reliability of Multi-input converters (MICs) with fault tolerance plays an important role while integrating with independent energy sources with any significant loads. In literature, many MICs are proposed and operated on the time-multiplexing concept. Only one energy source contributes to the loads, and others are idle during a particular duty interval. This leads to the underutilization of the converter as well as the input energy sources. A new configuration of Dual-Input and Single Output (DISO) DC-DC converter with switch and source fault tolerance has been proposed in the proposed work. The fault tolerance is the open-circuit condition due to the power switch fault and against one input short-circuit. The designed converter can deliver the buck, boost, and buck-boost operations. The feasibility of the proposed scheme, a 200W prototype is designed, and experimental results are used for validation.

A New Configuration of Switch and Source Fault-Tolerant Dual-Input Single-Output DC-DC Converter

In this study, the design of quantised state-feedback controller using a Delta-Modulator (Δ-M) for linear networked systems is proposed. This modulator can be considered as one type of sliding mode quantiser (SMQ) and has several advantages such as lower design complexity, lower cost, and less noisy. In this study, the stability conditions of both the continuous-time and the discrete-time Δ-M based quantised control systems are derived. The switching function bounds, which ensure that the steady state behaviour of the system is periodic are derived. The effectiveness of the Δ-M based quantised control system is investigated using a ZigBee protocol based experimental communication network with inherent imperfections associated with real-time network. It is shown that the designed quantised state-feedback controller gives the desired performance.

https://ieeexplore.ieee.org/ielx7/6287639/6514899/09767834.pdf

Dhafer Almakhles

Papers

Design of ∆Σ Based PID Controller for Wind Energy Systems

Common ground type five level inverter with voltage boosting for PV applications

Design and Implementation of Hysteresis Motor with Scrap Material Rotor Ring

A New Configuration of Switch and Source Fault-Tolerant Dual-Input Single-Output DC-DC Converter

Delta Modulator Based Quantised State-Feedback Control of Networked Linear Systems