Reactive Power Optimization Planning of High-voltage Distribution Networks With Technical Standards Being Considered

Abstract

Based on relevant technical standards of reactive power planning, a practical reactive power planning optimization model is presented in this paper for HV distribution networks. The objective is to maximize the net benefit of reactive power compensation, and the constraints involve some relevant technical standards' requirement of total reactive compensation capacities, discrete capacitor banks and their numbers, voltage quality and power factors. According to the characteristics of HV distribution network, a heuristic three-stage optimization method for reactive power planning in HV distribution networks is proposed to reduce the scale and complexity of optimization calculation, using power supply division and considering the influence of distributed generators, main transformer tap changers and weak loop networks. Firstly, for each relatively independent HV power supply area, the initial compensation bank number and capacity of a single node are determined successively in the order of net income from large to small. Then, considering the mutual influence of compensation capacities at different positions in the same power supply area, the initial planning scheme is iteratively revised. Finally, in global scope, the planning scheme is checked with AC power flow, further optimized and fine-tuned. Calculation and analysis of actual systems show that the proposed method is practical, fast and stable, especially suitable for reactive power planning optimization of large-scale HV distribution systems.