Artificial Neural Networks (ANNs) have demonstrated very interesting properties in adaptive identification schemes and control laws. In this work, they are employed for the on-line control strategy of an Active Power Filter (APF) in order to improve its performance. Indeed, neural-based approaches are synthesized to design adaptive and efficient harmonic identification schemes. The proposed neu...

The problem of controlling three-phase shunt active power filters (SAPF) is addressed in presence of nonlinear loads supplied with three-phase power grids. The SAPF-load system is shown to be modeled, in the ( , ) coordinate frame, by a third-order nonlinear state-space representation. The control objective is twofold: (i) compensating for the current harmonics and the reactive power absorbed b...

The effects of plasma treatment on the surface properties of Si-doped Al 0.5 Ga 0.5 N were studied by X-ray photoelectron spectroscopy and metal contact measurements. Plasma treatment resulted in a N-deficient nonstoichiometric AlGaN surface with an increased O concentration and large red shifts of photoelectron peaks. The red shifts remained after removal of the surface oxide, indicating a dow...

The fault recovery of VSC-HVDC transmission system is often influenced by many factors, such as the reactive power compensation characteristics of the inverter and the dynamic performance of DC controllers. In this paper, the PSCAD/ EMTDC simulation tool is used to study the dynamic recovery performance of VSC-HVDC system for several different var compensating devices in VSC-HVDC inverter-Fixed...

Photovoltaic systems have been increasingly used in the generation of electrical energy because of the cost of energy produced from fossil fuels is rising day to-day and there by photovoltaic energy becomes a promising alternative source for fossil fuels. Power quality is the major problem that occurs between grid to end user transmission lines. DSTATCOM is the one of the power quality compensa...

This paper proposes an improved droop control strategy based on changeable reference in low-voltage microgrids. To restore running frequency of distributed generation to a rated value without affecting its reactive power output, changeable frequency reference, mainly compensating for frequency deviation, are proposed corresponding to various load demands. In terms of active power sharing inaccu...

In recent years, energy, environment, right-of-way and cost problems and ‘quality need’ have delayed the construction of both generation facilities and new transmission lines. These problems have necessitated a change in the traditional concepts and practices of power systems. The objective of the work presented in this report is to make an EP based algorithm for solving the optimal power flow ...

Abstract— Reduction of the Harmonics is one of the major needs for Power System & it is demanded that source should provide a balanced & pure sinusoidal three-phase voltage of constant amplitude to the loads. But, due to excessive use of Power Electronics, a complex power quality problem evolved characterized by the voltage and current harmonics. Active power filters have been developed to solv...

Open-ended winding induction machines fed from standard two-level Voltage Source Inverters (VSI) provide an attractive arrangement for AC drives. An alternative approach is to use a dual output Indirect Matrix Converter (IMC). It is well known that the IMC provides fully bidirectional power flow operation, with small input size filter requirements. Whilst a standard IMC consists of an AC-DC mat...

Now a days, the problem of voltage sags and Swells create a severe impact on sensitive loads in industries . Due to which load shedding and over voltages might occur. Several custom power devices can be used to overcome this problem. Of these power devices Dynamic Voltage Restorer (DVR) is one of the most reliable and efficient custom power devices used in power distribution network. This paper...