The phase-locked loop (PLL) is applied in grid-tied systems to synchronise converter operation with grid voltage, affecting stability and performance. Synchronous reference frame PLL (SRF-PLL) a popular synchronisation method due its simplicity reliability. Normal SRF-PLL cannot suppress DC offset, causing basic frequency phase oscillations.When irregular, bandwidth should be reduced ensure acc...

The market for solar energy is growing these days, thanks to recent developments in Photovoltaic (PV) systems. integration of the grid required its optimum utilization. A novel control a single stage 3 phase connected inverter presented this paper. PV array, Voltage Source Inverter (VSI) converting dc ac, and filter that connects it are major components proposed system. output regulated with re...

Nowadays, active power filter (APF) is the most popular device for harmonic compensation. This paper presents soft computing techniques compensation of currents harmonics using a shunt (SAPF). The method includes 3-phase supply system with current-controlled voltage source converter (CC-VSC) having an input coupling inductor and output tank capacitor self-supported DC bus. performance can be en...

Inaccurate phase-angle jump (PAJ) estimation of the grid voltage during faults is one major causes for poor fault ride-through (FRT) performance converters. To overcome this issue and make converter’s current controller robust, article proposes a hybrid synchronization transition technique. In concept, synchronous reference frame-based phase-locked loop (SRFPLL) method used normal operation swi...

Voltage source inverters (VSIs) are usually used for all kinds of distributed generation interfaces in a microgrid. It’s the microgrid’s superiority to power the local loads continuously when the utility fails. When in islanded mode the voltage and frequency of the microgrid are determined by the VSIs, therefore the power quality can be deteriorated under unbalanced and nonlinear loads. A volta...

Generally model equations of power system components such as transmission lines, transformers and loads etc. are given in the ABC reference frame. But for components with rotating masses such as synchronous machines, induction motors etc., the DQ0 reference frame is usually preferred. In this paper dynamic phasor models of synchronous machines and transmission lines will be derived in ABC and D...

Abstract The global warming of the planet is as a result human activities. Fossil fuel depletion and its high prices have caused worldwide economic instability; governments around world turn to alternative energy sources that are pollution-free. Solar photovoltaic system one biggest renewable resources generate electrical power fastest growing generation in world. objectives this work are: ensu...

This paper presents novel Unified Power Quality Conditioner (UPQC) system based on seven-level Neutral Point Clamped (NPC) inverter using combined PD-SPWM and fuzzy control scheme. The proposed UPQC is adopted to mitigate source current harmonics compensate all voltage disturbances simultaneously. It designed by the combination of series shunt Active Filters (AFs) connected a common DC link cap...

<p>In this study, a control strategy based on the self-tuning method and synchronous reference frame (SRF) with PI regulator is proposed to achieve optimum quality of power in an autonomous micro grid (MG). The MGS multiple distributed generation (DG) connected 120 kV grid. system first simulated fixed gain values for controller which are not optimal sudden changes i.e. transition MG isla...