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Electric energy is usually generated through power stations (hydroelectric, gas, coil, nuclear) interconnected to ensure the power supply; but in the last years a massive number of renewable energy resources have been integrated in the electric grid helping to fulfill the power demand. Nevertheless, the interconnection of multiple generation along the distribution system affects the power quality...
In recent times, along with the growth of the solar energy extractions, the grid connected solar inverters are gaining more popularity. The huge deployment of solar inverters may reduce the power quality of utility grid, if they deployed without proper power quality measures. As per the IEEE 1547 standards, the current total harmonic distortion (THD) should not be more that 3 % at the point of common...
In this paper two recent presented active grid current stabilisation strategies for direct matrix converter based drives with squirrel-cage asynchronous induction machines are compared with there passive counterparts. While the functionality of the active stabilisation strategies has been proven already this publication focuses on the harmonic distortion of grid and machine current as well as the...
This paper proposes a novel control technique for the DSTATCOM. The DSTATCOM in this paper is connected to a distribution system with a DFIG based wind farm acting as a source. The DFIG here is considered to be operating in islanding mode. There are a large number of DSTATCOM controllers proposed. In this paper a novel optimised Icosf controller is proposed to reduce the THD level. The controller...
This paper presents a nonlinear control strategy for single-phase universal active filters, using multiple reference frames. The control uses the concept of product demodulations and feedback linearization to circumvent realization problems of standard park transformation strategies and resonant controllers. However, similar to those, the present control allows achieving selective compensation and...
This paper proposes an adaptive low-dc-link-voltage-controlled coupling hybrid active power filter (-HAPF) with a neutral inductor, which can compensate both dynamic reactive power and current harmonics in three-phase four-wire distribution power systems. Due to its adaptive low-dc-link-voltage characteristic, it can obtain the least switching loss and switching noise and the best compensating...
Voltage sags and swells, voltage harmonics and voltage imbalances in power systems may affect sensitive loads causing production interruption or equipment damage. Now-a-days series voltage compensation using power electronics devices is a promising solution for these problems and the design, control and application of this type of devices have drawn much attention in the literature. Comprehensive...
The control of Series Active Filter (SAF) to meet IEEE 519 standard for harmonic voltage source front-end based multiple adjustable speed motor drives, is reported in this paper. The series active filter design, control, implementation and issues in the practical application for utility interface of multiple three-phase six-pulse diode rectifier with dc side capacitor fed 480V, 150kW motor drives...
In many applications we need oscillators tunable over a considerable frequency range by simple LC circuits with broadly varying dynamic resistances (quality factor Q of the reactances), while insisting on keeping a rather constant amplitude of the A.C. voltage across the LC circuit, or at least of some output voltage (not necessarily of a harmonic waveform) somewhere in the circuit. If we manage to...
This paper proposes new control strategy for grid connected three-phase Voltage Source Converter (VSC). The strategy is designed to overcome problems of conventional voltage oriented VSC control operating under distorted grid voltage. Proposed control strategy cancels the influence of characteristic distribution grid voltage harmonics, and injects close to sinusoidal current to the grid, with permitted...
The comparative analysis of electromagnetic fields of three different kinds of reluctance brushless doubly-fed machine is proposed based on tooth flux method. This paper has analyzed the relationship between pole-arc factor and voltage value, pole-arc factor and total harmonic content of voltage, pole-arc factor and mutual-inductance of control winding and power winding of arc ALA, triangle ALA, salient...
In this paper a power electronic interface (PEI) that integrates up to two renewable energy sources is presented. The generation of the different distributed sources is controlled through the DC link terminal voltage and the AC terminal voltage of the voltage source converter (VSC). The renewable source can be controlled to supply electricity to the local load and export the exceeding energy to the...
This paper describes a new strategy to control a particular structure of three phase four wires LC coupled parallel hybrid power filter (APF) for harmonics cancellation. The main differential point of the studied structure consists of the connection of neutral wire to negative of DC bus in the inverter, thus avoiding the need of split capacitors at the DC bus [1]. The LC coupling and a particular...
This paper describes a new strategy to control a particular structure of three phase four wires LC coupled parallel hybrid power filters (APF) for harmonics cancellation. The main differential point of the studied structure consists of the connection of neutral wire to negative of DC bus in the inverter, thus avoiding the need of split capacitors at the DC bus. The LC coupling and a particular control...
A new harmonic current compensator composed of a static power converter was developed. It is composed of two voltage-type inverters in a multiplex configuration, this new compensator has a number of features that make it superior to the conventional passive filter composed of an AC reactor and a capacitor. This paper describes the principle of harmonic current compensation, the capability which the...
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