Phase-locked loop (PLL) systems play a crucial role in grid synchronization. Since variations on the voltage parameters are general uncertain, dynamics of PLLs by nature nonlinear. This fact imposes relevant challenge to guarantee their stability. Unfortunately, as argued this paper, there is remarkable lack global stability tests even for most common approaches, such <italic xmlns:mml="http://...

The Unified Power Quality Conditioner (UPQC) is a technology that has successfully addressed power quality issues. In this paper, photovoltaic system with battery storage powered presented. Total harmonic distortion of the grid current during extreme voltage sag and swell conditions more than 5% when UPQC controlled synchronous reference frame theory (SRF) instantaneous reactive (PQ) control. s...

In the case of grid voltage quality problems, traditional phase-locked loop (PLL) is hard to detect accurate frequency and phase during transient response, which will be detrimental synchronous stability grid-connected inverters. This paper proposes a mode switching based ride-through PLL (TRT-PLL), aiming improve phase-locking performance through detection technique switching. The TRT-PLL inco...

Abstract This paper uses Shunt Active Power Filter (SAPF) in a polluted and unbalanced mains voltage for the compensation of current harmonics along with reactive power. During reference is calculated by theory Synchronous Reference Frame (SRF). study utilizes Photovoltaic (PV) energy, renewable energy source, which maximum power point tracking (MPPT) method, an incremental conductance (InCnd),...

Power Quality (PQ) has been recognized as one of the main issues in electricity supply worldwide after invention nonlinear load. In 2017, PQ problem leads to significant economic losses Pan European region. Therefore, Active Filter developed during past two decades improve harmonic compensation, reactive power, and voltage balance. this research, evaluation Synchronous Reference Frame (SRF) met...

&lt;p&gt;&lt;span lang="EN-US"&gt;Nested neutral point clamped multi level inverter with inter connection to grid through the synchronous reference frame (SRF) controller for synchronization of voltage is demonstrated. The system's main feature that stress in each switching device kept a minimum, and redundant states are utilised flying capacitor balancing sinusoidal pulse-width modulation (PWM...

Frequency and phase of the power grid, which are critical for reliable control protection grid-tied devices, generally detected by closed-loop locked-loop (PLL). In highly inductive high-voltage transmission systems, decaying DC (DDC) components with large amplitude can be easily introduced load disturbances and/or grid abnormalities, leading to severe performance degradation PLL during transie...

This paper presents the three topologies of three-phase four-wire DSTATCOM for reduction of harmonics, reactive power compensation, increasing power factor, which occur due to a nonlinear load, environment problem and polluted grid. The performances of the above topologies have been compared for the magnitude of source current, power factor improvement, DC-link voltage regulation, and total har...