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The phase and frequency correction with a three-phase grid-connected solar photovoltaic-distributed static compensator (SPV-DSTATCOM) is challenging. For grid-connected SPV-DSTATCOM, this paper proposes a cascaded enhanced second-order general integrator frequency locked loop with prefilter (CESOGI-FLL-WPF) controller. The suggested work uses the available SPV power to meet the active power requirement of local loads. Furthermore, after addressing the local load demands, the extra SPV power is pumped into the grid. The voltage source converter (VSC) operates as a DC/AC inverter when sunlight is available and as a DSTATCOM when sunlight is not available. As a result, the VSC contributes to reactive power compensation, improved power quality, improved power factor, zero voltage regulation, efficient load balancing, and increased device utilization. The CESOGI-FLL-WPF controller is able to extract the fundamental components from nonlinear load currents, resulting in superior harmonics compensation and a highly rapid and stable dynamic response of the overall system under varied conditions. The suggested system is modelled and simulated using the MATLAB/Simulink software. The proposed SPV-DSTATCOM prototype is tested in the laboratory to ensure that it performs as expected.

Performance Evaluation of Three-Phase Grid-Tied SPV-DSTATCOM With DC-Offset Compensation Under Dynamic Load Condition