A Review of Control Techniques and Energy Storage for Inverter-Based Dynamic Voltage Restorer in Grid-Integrated Renewable Sources

Table 10

PLL synchronization schemes and performance comparisons.

PLL methods	SRF-PLL	DSOGI-PLL	DSRF-PLL	EPLL
Advantages	(i) Easy implementation; (ii) Computational burden is less; (iii) DC offset; (iv) Fast dynamic response; (v) Stability	(i) Fast dynamic response; (ii) Unbalanced voltage; (iii) Phase jumping; (iv) Variations and rise in frequency; (v) Stability; (vi) DC offset	(i) Harmonics; (ii) Unbalanced voltage; (iii) Stability; (iv) DC offset; (v) Computational burden is less; (vi) Load rising; (vii) Phase jumping	(i) Harmonics; (ii) Stability; (iii) Phase jumping; (iv) DC offset
Limitations	(i) Voltage unbalances; (ii) Phase jump; (iii) Frequency rising and overshoot; (iv) Load rising; (v) Harmonics	(i) Load rising; (ii) Average implementation; (iii) Harmonic; (iv) Computational burden is high; (v) Simplicity	(i) Frequency rising and overshoot; (ii) Simplicity; (iii) Average implementation	(i) The dynamic response is slow; (ii) Frequency rising and variations; (iii) Load rising; (iv) Average implementation; (v) Simplicity; (vi) Voltage unbalances