This paper presents the design and experimental voltage quality evaluation of controllers for the output voltages of 3-phase four-leg voltage source inverters. These inverters are needed in stand-alone power systems to supply linear and non-linear, balanced or unbalanced loads with constant RMS value voltages at fixed frequency. Comparisons include closed loop outer voltage controllers based on...

The increasing integration of grid-connected renewable energy systems impose major challenges reliability and power quality within grid system. Grid-connected must ensure stability, accommodate low voltage ride-through capability, comply with codes under unbalanced dips to avoid any grid-disconnection. In this context, paper proposes a novel control strategy improve inverter conditions. Positiv...

This paper presents an improvement to the fault ride-through (FRT) capabilities for a wind turbine that employs switched reluctance generator (SRG) using dynamic voltage restorer (DVR). The may be disconnected from grid by sag, swell, and faulty line in grid. To improve stator of SRG during failures, DVR is applied inject at point common coupling (PCC) into voltage. A control strategy based on ...

AbstractThe dynamic voltage restorer (DVR) is a series connected device for mitigating voltage sag/This paper presents with feed forward pre-sag/swell voltage control method to regulate the output voltage of pulse width modulated (PWM) voltage source converter (VSC). The proposed controller maintains a constant load voltage under the multiple balanced/unbalanced dynamic PQ disturbances. The pro...

This paper presents Nyström minimum kernel risk-sensitive loss (NysMKRSL) based control of a three-phase four-wire grid-tied dual-stage PV-hybrid energy storage system, under varying conditions such as irradiation variation, unbalanced load, and abnormal grid voltage. The Voltage Source Converter (VSC) enables the system to perform multifunctional operations reactive power compensation, load ba...

The uninterruptible operation of grid-connected renewables under the occurrence grid voltage sags is addressed in this work. This achieved due to incorporation an enhanced control algorithm a renewable source. low-voltage ride-through was developed accordance profile introduced by IEC 61400-21 regarding sags. To guarantee continuous agent during sags, not only instantaneous reactive power but a...

in this paper, photovoltaic (pv) grid-connected inverter which is the core device in pv grid-connected system has been in depth research.an improved predictive current controller has been developed by the authors for single-phase grid-connected voltage source inverters (vsi).based on dsp tms320lf2407a, a 10 kw single-phase grid-connected inverter has been built in this paper.thus is aimed at us...

Faults in medium and high voltage grids lead to voltage sags in the low voltage level. Due to the voltage dip, distributed generators disconnect from the low voltage grid. Depending on the amount of disconnected generation, system stability could be compromised. With a dynamic grid support, distributed generators remain connected to the grid during faults, also called fault ride-through. Moreov...