Abstract
Synchrony plays a major role in the interconnection process between local electric power generation systems and the electrical grid. Grid phase disturbances prevent the generation system from maintaining synchrony. Therefore, an efficient phase tracking method is necessary in order to detect phase jumps and abrupt changes in amplitude. In this paper, we propose a software-designed method to strengthen phase tracking based on the wrap process of a second-level Phase Locked Loop (PLL). The term ‘wrap’ means establishing the phase values of the reference signal in intervals of π to match it with the values obtained from the PLL output (sync pulse). To quantify phase error, a mathematical transformation of the time domain to the frequency domain is implemented. The validity of the proposed wrap function is verified using electrical disturbances.
Highlights
Many problems and technical challenges still need to be addressed for the successful interconnection of generation systems
A circular limit cycle oscillator (CLO) coupled with frequency-locked loop (FLL) is proposed by Ahmed et al (2019b), where a comparative analysis with an EPLL is performed using four test cases: non-smooth amplitude, phase, frequency, and DC bias jump; didnt considerer harmonics, the results show a maximum phase error of 40◦ with a phase jump disturbance of 40◦
The second case is a signal that contains multiple extreme phase jumps, which is shown in Figure 4 a) in order to evaluate the effectiveness of the wrap Phase Locked Loop (PLL) phase tracking
Summary
Many problems and technical challenges still need to be addressed for the successful interconnection of generation systems. While using renewable energy (RES) with the electrical grid, the biggest challenge is the synchronization of the power inverter (DC/AC); the form of the generated voltage wave generated must be similar to that of the electrical grid, in order to guarantee continuous and stable operation (Jaalam, Rahim, Bakar, Tan, and Haidar, 2016). The synchrony of the generated electricity is an adaptive process in which an internal reference signal formed by a control algorithm allows the output signal of the power inverter to operate synchronically with the fundamental component of the grid voltage. Jain, Jain, S., and Nema (2015) suggest that ideal synchrony occurs when the phase angle of the electrical grid is precisely followed, efficiently detecting disturbances and high harmonic components, and responding quickly to changes. The phase angle may experience smooth or abrupt changes due to system conditions such as faults (Karimi, Khajehoddin, Jain, and Bakhshai, 2012)
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