DC Power Flow Revisited

TLDR

Linear MW‑only DC network power flow models are widely used in congestion‑constrained markets, yet their accuracy varies across many variants, prompting a closer examination of their advantages and limitations. The paper re‑examines DC power flow models to assess their validity and utility.

Abstract

Linear MW-only ldquodcrdquo network power flow models are in widespread and even increasing use, particularly in congestion-constrained market applications. Many versions of these approximate models are possible. When their MW flows are reasonably correct (and this is by no means assured), they can often offer compelling advantages. Given their considerable importance in today's electric power industry, dc models merit closer scrutiny. This paper attempts such a re-examination.