Review Article

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

Table 14

Merits and demerits of various inverter topologies in DVR.

Ref. no.Inverter topologyStrengthsWeaknesses

[200]1 − ϕ half-bridge inverterThe switch count is reduced and it is quite inexpensiveThe harmonic content of the output voltage is high
[201]1 − ϕ full bridge inverterPreferably for high voltage systemsQuite high harmonic content
[205]3 − ϕ full bridge inverterSmooth control and cheap stress is higher, resulting in electromagnetic interference
[206]3 − ϕ four-leg inverterThe DC-link capacitor balancing problem does not existAdditionally, two more switches are required
[207]3 − ϕ six switch inverterThe requirement for power semiconductor devices is less, with simple topologyCompensation for unbalanced voltages is difficult
[208]3 − ϕ split capacitor six switches four-wire inverterAble to compensate for unbalanced voltagesDC-link capacitor balancing will face input/output voltage ratio issues
[203]AC-AC converterVariable and constant energy sources are not requiredLower efficiency for heavy sag in the substandard grid
[204]Z-source inverterCapable to supply the voltage for lower DC-link during deep voltage sagA number of LC elements are required and shoot through the problem