Power system harmonics

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 3 2   Download

This paper proposes a method of transmitting data on lines of distribution network. The paper utilizes a proper modulation method as well as proposes designs, especially filters, to minimize impacts of existing harmonics in power system on the accuracy of obtained information.

5p vilexus 05-10-2022 13 2   Download

Renewable energy is becoming an alternative to conventional generators in the context of increasing environmental pollution problems. Countries gradually consider photovoltaic application a necessary strategy for the sustainable development of modern power systems.

8p viirenerosenfeld 02-06-2022 9 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 11 0   Download

We present in this paper a control method of a novel hybrid parallel active power filter (HPAPF) used for harmonic currents elimination and reactive power compensation in the power system for threephase variable frequency drives (VFDs). The HPAPF configuration is built from two basically filter components including harmonics tuned passive filter and active power electronics filter.

11p vioregon2711 22-02-2021 12 1   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 16 0   Download

Power rectifiers are very necessary in the wind power generation systems since they are the necessary channels that link the generator and power gird together. However, they have some effects on the permanent magnet wind generator due to their work on fast on-off transitions.

15p vivalletta2711 11-01-2020 6 0   Download

The main source of spectral leakage in Quasi-synchronous DFT (QSDFT) harmonic analysis is the short-range leakage resulting from the fluctuating signals.

11p vivalletta2711 11-01-2020 10 0   Download

This paper points out the deficiency in the current harmonic frequency estimation algorithm in power system. In order to improve the accuracy of detection and reduce the computational complexity, the study combined the ESPRIT algorithm with multistage Wiener filter (MSWF) recurrence to achieve fast estimation of harmonic frequency.

6p vivalletta2711 11-01-2020 7 0   Download

In order to optimize the electric energy quality of HVDC access point, a modular multilevel selective harmonic elimination pulse-width modulation (MSHE-PWM) method is proposed. On the basis of keeping the minimum action frequency of the power device, MSHE-PWM method can meet the requirement for accurately eliminating low-order harmonics in the output PWM waveform.

7p vivalletta2711 11-01-2020 9 0   Download

Precise measurement of dielectric loss angle is very important for electric capacity equipment in recent power systems. When signal-to-noise is low and fundamental frequency is fluctuating, aiming at the measuring error of dielectric loss angle based on some recent Fourier transform and wavelet transform harmonics analysis method.

5p vivalletta2711 11-01-2020 10 0   Download

In the paper, a new harmonic estimation algorithm for power system is constructed with combining the MUSIC algorithm, the multistage Wiener filter (MSWF) and linear neural network.

7p vivalletta2711 11-01-2020 16 1   Download

The experimental results show that the protective principle applies not only to the neutral point insulated power supply system, but also to the power supply system in which neutral point passes arc suppression coil, which can solve selective leakage protection problems under different neutral grounding ways, improving the reliability of selective leakage and guaranteeing the stability of the action value.

10p vivalletta2711 11-01-2020 8 1   Download

In the paper, the influence of harmonic was taken into consideration during the realization of the AVC system in the power grid of Wuhu region, relevant study and development were conducted from the perspective of application and practice, and concrete proposal of practicable reactive voltage power optimization was put forward.

9p vivalletta2711 11-01-2020 7 0   Download

This paper presents a new harmonics frequency estimation method. Unlike the conventional harmonic frequency estimation method (fast Fourier transform), the new algorithm is based on spectrum analysis techniques often used to estimate the direction of angle; the most popular is the multiple signal classification (MUSIC) algorithm.

5p vivalletta2711 11-01-2020 12 0   Download

The world over the decades has made considerable advancement in automation; it is employed in homes, industries, commercial and educational sectors. In present work, a solar power-operated microcontroller-based automatic college bell is designed and developed. For the harmonic tuning, converted normal college bell into automatic college bell and powered by solar PV system with battery backup. It uses electrical coil for generating the EMF for striking the clapper on the edge of a bell for making sound. It uses the Real Time Clock (DS1307) which tracks the real time.

8p kethamoi2 15-12-2019 18 0   Download

To mitigate the harmonic problems in industrial power system, the simple way is to use shunt passive filters. This paper presents the effect of compensation and detuning of single tuned shunt passive filter on harmonics of industrial distribution system. The three phase power system and single tuned passive filter is designed, modeled and simulated in MATLAB by using the actual data collected from industry is used.

5p cothumenhmong1 11-12-2019 18 0   Download

Voltage sags can be symmetrical or unsymmetrical depending on the causes of the sag. At the present time, one of the most common procedures for mitigating voltage sags is by the use of dynamic voltage restorers (DVRs). By definition, a DVR is a controlled voltage source inserted between the network and a sensitive load through a booster transformer injecting voltage into the network in order to correct any disturbance affecting a sensitive load voltage. In this paper, modelling of DVR for voltage correction using MatLab software is presented.

9p kequaidan1 16-11-2019 23 0   Download

This paper proposes a new state-space model that can well represent a real threephase power system by taking into account the unbalance conditions and harmonic distortion of a three-phase power system. The model associated with Extended Kalman Filter is then applied to estimate the positive and negative sequences of the fundamental component.

6p vicapital2711 02-08-2019 15 1   Download

This paper introduces a control structure based on the classical PID controller in order to monitor the IGBT switching frequency while still guaranteeing the qualities of SAPF. There are two controlled loops needed for the system.

10p visumika2711 17-07-2019 11 0   Download