Consideration of Simulation Methods for Reactive Power Compensation Optimization in Distributed Photovoltaic Distribution Networks

With the widespread application of Distributed Photovoltaics (DPV) within the distribution network, issues related to voltage exceedance and voltage fluctuations have become increasingly grave. To effectively address these challenges, this paper proposes a coordinated control methodology for reactive power compensation in the distribution network, integrating the Flexible Load Tap Changer (OLTC). This approach consists of two distinct phases. The first phase involves hourly scheduling, wherein flow calculations and iterative optimizations are conducted based on predictive data for distributed photovoltaics and load, allowing for the determination of the operational status of critical equipment. The second phase focuses on minute-level reactive power optimization, which refines the distribution of reactive power among nodes by leveraging the reactive power characteristics of the flexible OLTC and DPV, thus enhancing voltage conditions. Validation through simulations on the IEEE 33-node distribution system model reveals that the proposed methodology demonstrates significant efficacy and rationality in voltage reactive power optimization and economic improvement.