Abstract
In this paper, an attempt to compare the performance of auto synchronization techniques such as zero cross detection technique, charge pump phase locked loop and synchronized reference frame phase locked loop has been made. The auto synchronization techniques are designed to reduce the mismatch between the grid voltage and inverter voltage parameters, which can further improve the delivered power quality thereby preventing grid islanding conditions. Such three different systems are analyzed using MatLab-Simulink and their performances are compared in compliance with IEEE 929 standards prescribed for power transfer from inverter to grid and IEC 61727 / IEEE 1547 standards for harmonic limitation of grid connected inverters.
Highlights
Increasing power demand requires the harnessing of renewable energy sources with conventional power generation methods
A synchronization check relay complied with ANSI 25 standard to verify the magnitude, phase angle and frequency of the voltage at point of common coupling (PCC) and power conditioning unit (PCU) is used in this work
To identify the harmonic suppression capability of the three techniques (ZCD, Charge pump phase locked loop (CP-PLL) and Synchronized reference frame phase locked loop (SRF-PLL)), the harmonics at the PCC was introduced as 5 %
Summary
Increasing power demand requires the harnessing of renewable energy sources with conventional power generation methods. Frequency fluctuation is a common scenario in grid connected systems due to load variations and power swings. If the source is a generator, the frequency variation can be matched with suitable speed control techniques. The stability of the SPV grid connected system is further challenged by partial clouding issues These issues would have a direct impact on all the frequency dependent functions like synchronization, load frequency control, active and reactive power control. The method of following the phase angle and frequency of the grid voltage after synchronization is called as an auto synchronization technique (Sahasrabudhe et al, 2005). The above mentioned techniques have been tested subject to various scenarios that are likely to occur in a grid. The compliance of the results with IEEE 929, IEC 61727 and IEEE 1547 standards are presented
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