Harmonic loads

Part 2 of ebook "Electrical design guide for commercial buildings" provides readers with contents including: Chapter 10 - Motors; Chapter 11 - Transformers; Chapter 12 - Estimating; Chapter 13 - Computer applications; Chapter 14 - Value engineering; Chapter 15 - Load control and harmonics; Chapter 16 - Special applications; Chapter 17 - Designing in CAD programs; Chapter 18 - Short specifications; Chapter 19 - Electrical checklist; Chapter 20 - Designing for conservation; Chapter 21 - The production process;...

162p tuongmothua 11-07-2024 0 0   Download

Part 2 book "Electric power engineering handbook" includes content: Reactive power compensation, environmental impact of transmission lines, power system loads, distribution system modeling and analysis, power system operation and control, hard to find information (on distribution system characteristics and protection), real time control of distributed generation,... and other contents.

238p dianmotminh01 20-05-2024 6 3   Download

The present paper considers the composite plate resting on an elastic pinned subjected to harmonic loads. The plate element model with high-order shear deformation theory and finite element algorithm is proposed in order to buckling analysis of the plate. As a result, the buckling domain is determined. Moreover, the effect of geometric parameters, elastic pins, and materials on the buckling of the plate is comprehensively investigated.

10p dathienlang1012 03-05-2024 1 0   Download

A novel frequency domain assurance criterion, called hereby Spectral Assurance Criterion (SAC), is proposed for frequency response analysis of cracked piezoelectric beam under moving load. First, a model of cracked beam bonded with a piezoelectric layer under moving harmonic load is conducted based on the double beam conception and then, analytical expressions of midspan beam deflection (mechanical response) and output charge produced in the piezoelectric layer (electric response) has been established in the frequency domain.

10p dathienlang1012 03-05-2024 1 0   Download

This paper presents the time history response of a sandwich beam with a porous core subjected to two moving harmonic loads with opposite directions. In the modelling, the beam is combined of two isotropic face sheets and a porous core with symmetric porosity distribution. The quasi-3D shear deformation beam theory in conjunction with Hamilton’s variational principle is utilized to set up the governing equations of motion. The Navier solution is used to obtain the displacement field.

14p dianmotminh02 03-05-2024 6 2   Download

Excessive unbalance of the DC capacitor voltages of the inverter can cause overvoltages on power components and capacitors, causing unintended low-order harmonics on the load side such as second harmonics, 3rd, 4th, 5th,..., causing direct harm to the motor load, reducing the controllability of the reverse voltage and filter compensating current for the active filter circuit, affect to the performance of electric vehicles (EVs).

12p viohoyo 25-04-2024 3 2   Download

Part 1 book "Structural dynamics" includes content: Undamped single degree of freedom system; damped single degree of freedom system; response of one degree of freedom system to harmonic loading; response to general dynamic loading; response spectra; nonlinear structural response; free vibration of a shear building; forced motion of shear buildings; reduction of dynamic matrices; dynamic analysis of beams; dynamic analysis of plane frames.

325p muasambanhan06 01-02-2024 5 1   Download

In this paper, there is proposed a novel damage index extracted from frequency response of cracked Timoshenko beam under moving harmonic load using the so-called Modal Assurance Criterion (MAC) concept. First, frequency response of a cracked Timoshenko beam subjected to harmonic force moving on the beam with constant speed is obtained in an analytical expression.

11p viwolverine 11-07-2023 7 2   Download

The article presents the element model, finite element algorithm, and buckling analysis results of reinforced composite plates subjected to dynamic loads in order to determine the buckling domain.

15p viwolverine 11-07-2023 3 2   Download

This paper presents a new pulse width modulator control method using the offset function to reduce switching loss in five-level Cascade inverter. The proposed technique is based on the offset function being 3rd harmonic voltage. The offset voltage will be added to the control voltages so that the voltage of phase which has absolute of load current largest move into top or bottom of the carriers.

7p vidoctorstrange 06-05-2023 4 2   Download

The paper introduces a new carrier PWM technique to control the cascade inverter output. Improving electrical power quality by reducing harmonic content caused by nonlinear load will be considered. In this paper, there will be mathematically formulated and simulated for 5-level cascade inverter and applied in filtering harmonics in three-phase four-wire unbalanced load system.

8p vicaptainmarvel 21-04-2023 8 4   Download

Lecture Finite element method: Chapter 3 - Dynamic analysis, after studying this section will help you understand: Introduction; Modal analysis; Transient analysis.A dynamic analysis is a technique used to determine the dynamic behavior of a structure or component. It is an analysis involving time, where the inertia and possibly damping of the structure play an important role.

40p billyelliot 11-11-2021 23 0   Download

In this paper, the problem of surface wave propagating in an elastic half-space media is investigated by boundary element method. The boundary element method is studied to obtain the far-field displacements generated by time-harmonic loads. An elegant treatment for the truncated point on the boundary is provided in which omitted parts of the boundary are substituted by two fictitious boundaries in the end of two sides of boundary by using reciprocity theorems.

4p viwendy2711 05-10-2021 15 1   Download

The main aim of this paper is to compensate a current harmonics in PV-APF system using Fuzzy Logic Controller. A 3- Ф 3-wire system is proposed in this paper which consists of PV system, a dc/dc converter which is controlled by MPPT, three phase VSC to act as APF and Non-Linear Load. The main theme of this INC MPPT is to efficiency from the PV system.

7p phanngocminhtam 14-09-2021 13 1   Download

The proposed scheme is verified by the simulation results which show that three-phase split-capacitor inverter gives a low total harmonic distortion (THD) for the load voltages under the balanced or unbalanced nonlinear load conditions.

12p cothumenhmong11 06-05-2021 24 1   Download

In this paper, vibration of a 2D-FGSW Timoshenko beam formed from three distinct materials traversed by a harmonic load is studied by the finite element method. The beam consists of three layers, a homogeneous core and two FGM skin layers with the material properties continuously varying in both the thickness and length directions by power functions.

16p cothumenhmong9 04-01-2021 12 1   Download

In this paper, a Simulink modeling of Active Power Filter was established to reduce the harmonic with high adaptability for kinds of loads. Fuzzy logic controller was used to control the capacitor’s DC voltage of the two level three phases inverter that was designed to work as an Active Filter.

13p lucastanguyen 01-06-2020 43 5   Download

Dynamic instability of thin rectangular plates subjected to uniform in-plane harmonic compressive load applied along two opposite edges are investigated in this paper. The dynamic stiffness method (DSM), as a consequence the dynamic stiffness matrices, is used to analyze the free vibration, the static stability, and dynamic instability of thin plates under different boundary conditions.

11p vijakarta2711 09-06-2020 15 3   Download

Using renewable energy sources for providing electricity in remote area is an economical-technical solution and reduces environmental pollution. Tho Chu island, Phu Quoc district, Kien Giang province, is currently supplied by diesel generators, causing environmental pollution and high-power generation costs. This article presents hybrid renewable energy system (HRES) design including diesel generator, photovoltaic system and energy storage system for Tho Chu Island.

10p 12120609 01-06-2020 17 1   Download

THDv is still within the safe limit under 5%, as well as for the THDi is also still within the safe limit of tolerance of 15%. As a result of harmonic disturbances and load imbalances in the building G5 in 2018, the caused losses of power losses that need to be borne by Universitas Muhammadiyah Yogyakarta in the amount of Rp 9,210,133.09.

11p lucastanguyen 28-05-2020 10 0   Download