Reexamining the Distributed Slack Bus

Sairaj V. Dhople

doi:10.1109/TPWRS.2020.2987325

2020-11-01

PRE

Sairaj V. Dhople *

Yu Christine Chen

Abdullah Al-Digs

Alejandro D. Domínguez-García

DOI：10.1109/TPWRS.2020.2987325

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摘要

En 中文

Power flow formulated with a distributed slack bus involves modeling the active-power output of each generator with three elements: a nominal injection modulated by a fraction of the net-load imbalance allocated via a participation factor. This setup acknowledges generator dynamics and system operations, but it has long been plagued by ambiguous and inconsistent interpretations of its constituent elemental quantities. In this paper, we establish that, with the: i) nominal active-power injections set to be the economic dispatch setpoints, ii) participation factors fixed to be the ones used in automatic generation control, and iii) net-load imbalance considered to be the total load and loss unaccounted in economic dispatch, the power flow solution best matches results from a simulation unto steady state of the system differential algebraic equation (DAE) model. Numerical case studies tailored to the New England test system validate the analysis by demonstrating that solutions obtained froma distributed slack formulation offer lower errors (with respect to DAE-model simulations) compared to the exhaustive set of all single slack bus choices.

Keyword:

Generators

Economics

Automatic generation control

Mathematical model

Load modeling

Power system dynamics

Numerical models

Automatic generation control

distributed slack bus

economic dispatch

participation factors