Open AccessInterval power flow calculation algorithm for multi‐terminal dc distribution networks considering distributed generation output uncertainties
Author(s) -
Liu Qi,
Wang Shouxiang,
Zhao Qianyu,
Wang Kai
Publication year - 2021
Publication title -
iet generation, transmission and distribution
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.92
H-Index - 110
eISSN - 1751-8695
pISSN - 1751-8687
DOI - 10.1049/gtd2.12074
Subject(s) - voltage droop , algorithm , control theory (sociology) , voltage , interval (graph theory) , network topology , offset (computer science) , power (physics) , power flow , newton's method , affine transformation , computer science , topology (electrical circuits) , electric power system , mathematics , voltage source , engineering , nonlinear system , control (management) , electrical engineering , physics , combinatorics , artificial intelligence , quantum mechanics , pure mathematics , programming language , operating system
An interval power flow calculation (PFC) algorithm for multi‐terminal DC distribution networks is proposed to handle the uncertainties of distributed generation output powers and loads. Firstly, an equivalent resistance is introduced to represent the effect of droop control in DC distribution networks. The power losses of the equivalent resistance are offset by adding the injection powers to droop nodes, which guarantees the precision of the equivalent resistance model. The Newton–Raphson method is used for deterministic PFC based on the equivalent resistance, and it is applicable to DC distribution networks with different kinds of network topologies and voltage source converter control modes. Secondly, based on the deterministic PFC algorithm and affine arithmetic, an interval PFC algorithm is presented to handle the uncertainties of distributed generation output powers and loads. The affine arithmetic based interval PFC algorithm not only can determine power flow intervals quickly and accurately, but also can analyse the influences of distributed generation outputs to nodal voltages. Finally, a series of test systems are used to validate the proposed algorithms. Simulation results illustrate the accuracy and efficiency of the deterministic PFC algorithm and the interval PFC algorithm for multi‐terminal DC distribution networks.