Justified distribution factors approach for pool modelling

Abstract

Distribution factors have been used to identify the contributions of the transmission users towards line flows in an electricity market. They are the basis of transmission usage charges in many cases more fairly. However, the existing distribution factors still have various limitations which prevent the wider application of this technique in electricity market practices. In this paper, a new technique is proposed to evaluate the transmission line flows more accurately. The proposed approach, referred to as justified distribution factors approach, is tested in a realistic electricity market against other commonly used distribution factors to show its effectiveness.

RETRACTED: New Australian NEM transmission use of system charging methodologies for integrating renewable generation to existing grid

“…The steps to obtain GGJDFs or JD factors are still same as GGDFs approach except they use JDF to replace A factors [19]:…”

“…Generalized Load Justified Distribution Factors (GLJDFs) or JC factors GLJDFs is also formulated based on JDF instead of using A factors and mathematically written as [19]:…”

A new transmission charging methodology for Australian National Electricity Market

“…The reason is clear because by giving the credit to the transmission users for their contribution in counter flow could cause difficulties to the transmission utilities to recover the revenue requirement. Hence, the MW-mile method (negative-flow sharing) was introduced in [8]. For the non-locational charges, the Postagestamp coverage method has been used by the transmission utilities for instance Electricity Supply Board National Grid (EirGrid)-Republic Ireland, and Transend-Australia to cover the total transmission revenue.…”

“…JDFs was originally used to solve the congestion curtailment in bilateral trading [6]. This factor, which is derived in [6], has advantages over the original distribution factor [7], whereby the elements in the distribution matrix do not vary with the reference bus position [8]. In this paper, JDFs is formed by adding a justification factor J ij to the original DFs, so that distribution factors for line i-j at bus i and bus j have the same magnitudes but opposite signs, where mathematically [6]:…”

“…According to [8], this JDFs is used to trace the power flows in transmission lines for the base case and transactionrelated flows. The power flow in line i can be traced using (4).…”