A Comprehensive Centralized Approach for Voltage Constraints Management in Active Distribution Grid

Abstract

Abstract-This paper deals with the management of voltage constraints in active distribution systems that host a significant amount of distributed generation (DG) units. To this end we propose a centralized optimization approach which aims at minimizing the amount of MW curtailment of non-firm DG to remove voltage constraints. The salient feature of this approach is that it comprehensively and properly models the full variety of possible control means (i.e. DG active/reactive power including DG shut-down, on load tap changing transformer ratio, shunt capacitor, and remotely controlled switches or breakers), most of which having a discrete behavior. We develop and compare the performances of two optimization models on a snapshot basis for various distribution systems up to 1089 buses. In particular we show that the use of remotely controlled switches so as to transfer DG between feeders in case of voltage constraints may lead to significant reduction of the DG curtailment.

Fully distributed control to coordinate charging efficiencies for energy storage systems

“…Correspondingly, the discharging process of the i-th ESS can be described as (11), where P E,Dis,i is the discharging power of the i-th ESS when it is positive; P E,D,i is the power actually extracted from stored energy in the i-th…”

“…For instance, DG control [6,7], load control [8,9], the local optimized control scheme of DGs and energy storage systems (ESSs) [10], as well as the hierarchical control scheme [11][12][13] have all been proposed and applied. The coordination control strategy of ESSs was considered as an effective solution for stabilization of an ADS [14].…”

Evaluation of Voltage Control Approaches for Future Smart Distribution Networks

“…The control method and capability of DGs depend on the DG technology and distribution network operator's preference [20][21][22]. Here, the DG reactive power capability curves are modelled by real/reactive power constraints for simplicity and generality, represented by (9) and (10).…”

Optimal voltage control strategies for day-ahead active distribution network operation

“…The proposed approach aims to guarantee that active power generation does not cause voltage rise. With an objective function that minimizes DG curtailment and voltage violations, the study in [11] proposes a comprehensive centralized voltage constraint management approach. Provided that the VCM problems are formulated properly, the MINLP solvers generally provide an acceptably fast solution, as most distribution systems are equipped with a relatively small number of discrete control means [11].…”

“…With an objective function that minimizes DG curtailment and voltage violations, the study in [11] proposes a comprehensive centralized voltage constraint management approach. Provided that the VCM problems are formulated properly, the MINLP solvers generally provide an acceptably fast solution, as most distribution systems are equipped with a relatively small number of discrete control means [11]. In [11], the transfer of DG between feeders using only remotely controlled switches only occurs when the DG curtailment cost exceeds the cost of switching.…”