Advanced Network Voltage Control for Grid-Connected PV Systems Using Smart PV Inverter Capabilities

Photovoltaic (PV) systems integrated into low-voltage distribution networks (LVDNs) can induce voltage violations, raising concerns regarding their penetration limits. Although grid-connected PV systems (GCPV) offer advantages such as reduced production costs and enhanced efficiency, managing their voltage impact remains essential. To mitigate the need for grid reinforcements, distribution network operators must develop innovative control strategies that facilitate cost-effective PV integration. Advanced control techniques, including volt-watt control (VWC), volt-var control (VVC), and their coordinated combination (VWC-VVC), can effectively manage voltage violations by absorbing or injecting reactive power, or by curtailing active power output. This study evaluates inverter performance in GCPV systems subject to considerable voltage fluctuations due to high PV penetration. Real operational data from a GCPV system at the Centre for Renewable Energy Development (CDER) validate the proposed simulation methodology. Results demonstrate the effective application of PV inverters for LVDN integration and quantify the benefits of enhanced voltage management achieved through VWC and VVC functionalities.  

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