Optimal control of small hydropower plants and power transformer tap changer in distribution network in order to minimize active power losses

Abstract

In the concept of distribution generators (DG) integration, distribution network becomes active and philosophy of network guidance and control changes. The presence of DG in the network often results in the active losses increase and thus the maintenance costs raise. This problem is offen noted in radial networks, as DG in this type of networks make network doubly fed. This paper gives an answer how to run one or more small hydropower plants (SHPP) in a radial network with minimal losses. In this paper, the analysis of power flows, combined with optimization methods and technical constraints (voltage constraints according to EN50160) are carried out. One example with detailed calculations, conclusions and diagrams comments is conducted. The conclusions in this paper directly indicate the possible measures to be implemented in order to achieve a higher SHPP and distribution network performance.

A Real Distribution Network Voltage Regulation Incorporating Auto-Tap-Changer Pole Transformer Multiobjective Optimization

“…Likewise, in [9], a network reconfiguration was carried out over two domains simultaneously: Re-switching strategies and transformer tap-changer adjustments. Similarly, several techniques and strategies for voltage stability enhancement and regulation have been applied, using several case studies under different conditions [10][11][12][13][14][15]. This study aims to present a fully solid-state tap-changer solution with a new control strategy and optimal configuration.Over the past decades, power system blackouts due to voltage instability were repeatedly reported; namely, Tokyo blackout on 23 July 1987 and United Kingdom, Sweden, Canada, Denmark, Italy, and the United States blackouts in 2003 [16].…”