This paper presents a contribution related to the control of nonlinear variable-speed marine current turbine (MCT) without pitch operating below the rated marine current speed Given that the operation of the MCT can be divided into several operating zones on the basis of the marine current speed, the system control objectives are different for each zone To deal with this issue, we develop a new control approach based on a linear quadratic regulator with variable generator torque Our proposed approach enables the optimization of the rotational speed of the turbine, which maximizes the power extracted by the MCT and minimizes the transient loads on the drivetrain The novelty of our study is the use of a real profile of marine current speed from the northern coasts of Morocco The simulation results obtained using MATLAB Simulink indicate the effectiveness and robustness of the proposed control approach on the electrical and mechanical parameters with the variations of marine current speed

/pdf/optimal-feedback-control-of-nonlinear-variable-speed-marine-2swhahmcge.pdf

Optimal Feedback Control of Nonlinear Variable-Speed Marine Current Turbine Using a Two-Mass Model

The grid integration of microgrids and the selection of energy management systems (EMS) based on robustness and energy efficiency in terms of generation, storage, and distribution are becoming more challenging with rising electrical power demand. The problems regarding exploring renewable energy resources with efficient and durable energy storage systems demand side management and sustainable solutions to microgrid development to maintain the power system’s stability and security. This article mainly focuses on the overview of the recent developments of microgrid EMS within the control strategies and the implementation challenges of the microgrid. First, it provides energy management strategies for the major microgrid components, including load, generation, and energy storage systems. Then, it presents the different optimization approaches employed for microgrid energy management, such as classical, metaheuristic, and artificial intelligence. Moreover, this article sheds light on the major implementation challenges of microgrids. Overall, this article provides interactive guidelines for researchers to assist them in deciding on their future research.

https://www.mdpi.com/2071-1050/14/22/14794/pdf?version=1668655950

Review of Recent Developments in Microgrid Energy Management Strategies

High Efficiency Buck LED Driver Using SiC

The demand for lean protein is the main reason for raising domesticated birds in poultry farms for the purpose of farming meat or eggs for food. In these poultry farms, artificial lighting system i...

Performance Analysis of Single-Stage LED Buck Driver Topologies for Low-Voltage DC Distribution Systems

Operasi switching pada komponen semikonduktor LED driver, akan menghasilkan permasalahan berupa EMI yang akan mengganggu perangkat di sekitarnya (sebagai sumber) atau sistem itu sendiri (sebagai korban). Teknik mitigasi EMI pada LED driver dibatasi oleh biaya, ukuran, berat dan kinerja sistem. Berbagai solusi digunakan untuk mengurangi permasalahan EMI pada LED driver, melalui disain converter, disain komponen, disain filter EMI, dan teknik spread spectrum (SS). Dari beberapa solusi tersebut, SS merupakan solusi yang murah dan berdaya guna dalam mitigasi EMI, karena teknik ini dapat diaplikasikan dengan pemrograman pada embedded system dengan penambahan sedikit komponen. Program yang diterapkan dalam penelitian ini adalah mengatur pola pembangkitan sinyal PWM dengan metode random up spreading switching frequency sebagai pengendali konverter. Pendekatan menggunakan embedded system memiliki beberapa keuntungan diantaranya menjaga efisiensi, kehandalan dan kinerja yang tinggi karena minim perubahan rangkaian atau komponen tambahan dan mempunyai kompleksitas disain yang relatif rendah. Hasil dari penerapan metode ini adalah didapatkan penurunan EMI sebesar 20% saat frekuensi switching diacak pada rentang 600 KHz hingga 650 KHz dengan step random minimal 100 Hz dan masing-masing frekuensi diberi waktu melakukan switching selama 1 mikro detik. Nilai tegangan output dari LED driver tetap bisa bertahan pada level 7V ketika metode ini diterapkan.

/pdf/teknik-mitigasi-conducted-emission-pada-led-driver-topologi-51yc8r04au.pdf

Teknik Mitigasi Conducted Emission Pada LED Driver Topologi Buck Dengan Metode Random Up Spreading Switching Frequency

A performance analysis of tidal turbine conversion system based on control strategies

Most of the loads connected to the existing AC distribution system operate with low voltage DC power. Hence, there is a requirement to convert AC into DC power. Often there are many ineffic...

LED Boost Driver Topologies for Low Voltage DC Distribution Systems in Smart Structured Buildings

Lighting is an important feature for the interior of a room as it produces a good state of mind, atmosphere, and beautiful appeal in living space. Light and lighting fixture create a pleasant and safe habitat besides adding style to the interior of a room. Moreover, as lighting consumes nearly 35% of the total electricity consumed in a building, LED drivers are proposed to increase energy efficiency. Lighting design is mandatory for the placement of lights to have good illumination, thereby lighting design is done for a two-bedded hostel room with fluorescent and LED lights and their performance is analyzed. A phase-shifted buck converter (PSBC) LED driver is designed and experimented for 24 and 6 W to retrofit the existing fluorescent lights in the two-bedded room. The results show that the output lumens and efficiency of PSBC LED driver are higher than conventional LED driver (CBC). Based on the PSBC experimental results, a lighting design is done using DIALux software for the existing room with fluorescent lights and a retrofitted room using PSBC and LED lights. The simulation results show that PSBC driver provides good illumination and has better energy savings. The estimated installation cost, energy savings, and energy efficiency for the PSBC driver and a conventional buck driver also prove that PSBC driver is a better alternative for energy savings.

R. Srimathi

Papers

A performance analysis of tidal turbine conversion system based on control strategies

High Efficiency Buck LED Driver Using SiC

LED Boost Driver Topologies for Low Voltage DC Distribution Systems in Smart Structured Buildings

Performance Analysis of Single-Stage LED Buck Driver Topologies for Low-Voltage DC Distribution Systems

Lighting Design for a Campus Hostel Building Using Single-Stage Efficient Buck LED Driver