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The occurrence of voltage violations are a major deterrent for absorbing moreroof-top solar power to smart Low Voltage Distribution Grids (LVDG). Recentstudies have focused on decentralized control methods to solve this problem dueto the high computational time in performing load flows in centralized controltechniques. To address this issue a novel sensitivity matrix is developed toestimate voltages of the network by replacing load flow simulations. In thispaper, a Centralized Active, Reactive Power Management System (CARPMS) isproposed to optimally utilize the reactive power capability of smartphoto-voltaic inverters with minimal active power curtailment to mitigate thevoltage violation problem. The developed sensitivity matrix is able to reducethe time consumed by 48% compared to load flow simulations, enabling nearreal-time control optimization. Given the large solution space of powersystems, a novel two-stage optimization is proposed, where the solution spaceis narrowed down by a Feasible Region Search (FRS) step, followed by ParticleSwarm Optimization (PSO). The performance of the proposed methodology isanalyzed in comparison to the load flow method to demonstrate the accuracy andthe capability of the optimization algorithm to mitigate voltage violations innear real-time. The deviation of mean voltages of the proposed methodology fromload flow method was; 6.5*10^-3 p.u for reactive power control usingQ-injection, 1.02*10^-2 p.u for reactive power control using Q-absorption, and0 p.u for active power curtailment case.

A Sensitivity Matrix Approach Using Two-Stage Optimization for Voltage Regulation of LV Networks with High PV Penetration