Coordinated Voltage Control in Distribution Networks Including Several Distributed Energy Resources

TLDR

Connecting distributed generation to weak distribution networks often causes voltage rise, and passive mitigation such as network reinforcement is costly, prompting interest in active voltage control to reduce connection expenses. This study proposes and evaluates two coordinated voltage control algorithms for distribution networks with multiple distributed energy resources. The first algorithm applies rule‑based control actions, while the second employs optimization; both are initially examined through time‑domain simulations and later compared in statistical network planning and practical implementation contexts. Comparative analysis shows differences in network effects and costs between the rule‑based and optimization algorithms, highlighting practical implementation considerations.

Abstract

Connecting distributed generation (DG) to weak distribution networks can often cause voltage rise problems. Traditionally, these voltage rise problems have been mitigated by passive methods such as reinforcing the network. This can, however, lead to high connection costs of DG. The connection costs can in many cases be lowered if active voltage control methods are used instead of the passive approach. In this paper, two coordinated voltage control algorithms suitable for usage in distribution networks including several distributed energy resources are proposed and studied. The first algorithm uses control rules to determine its control actions and the second algorithm utilizes optimization. The operation of the implemented algorithms is, at first, studied using time domain simulations. Thereafter, the network effects and costs of both algorithms are compared using statistical distribution network planning and also practical implementation issues are discussed.