Optimal Planning of DG and Shunt Capacitor in a Harmonic Distorted Distribution Network

Rapidly growing electricity demand and increasing use of advance power electronic devices introduce power quality issues in distribution networks. If these issues go beyond considerable limits, they can affect the efficiency and the reliability of the power system. In this work, the optimal allocation of distributed generation (DG) and shunt capacitor is studied in a distorted network to address various power quality issues. These issues are incorporated by formulating a multi-objective function, considering total harmonic distortion (THD), active power loss and voltage stability index. An Improved Particle Swarm Optimization (IPSO) method with chaotic variation of inertia weight and crossover is applied to the proposed optimization problem. Two cases are formed to show the impact of DG and capacitor integration on a modified IEEE 33 bus-distributed system with non-linear loads. Superiority of the proposed method is observed by comparing the optimal solution obtained with the standard Particle Swarm Optimization and Genetic Algorithm techniques.