Multi-Stage Holomorphic Embedding Method for Calculating the Power-Voltage Curve

TL;DR

This paper introduces a multi-stage holomorphic embedding method to accurately compute the power-voltage curve in heavily loaded power systems, addressing precision issues inherent in the original approach.

Contribution

It proposes a novel multi-stage scheme that enhances the precision of the holomorphic embedding method for P-V curve calculation.

Findings

The method effectively reduces round-off errors in high-load scenarios.

Verification on the 39-bus system shows improved accuracy over existing methods.

Results are consistent with traditional continuation power flow benchmarks.

Abstract

The recently proposed non-iterative load flow method, called the holomorphic embedding method, may encounter the precision issue, i.e. nontrivial round-off errors caused by the limit of digits used in computation when calculating the power-voltage (P-V) curve for a heavily loaded power system. This letter proposes a multi-stage scheme to solve such a precision issue and calculate an accurate P-V curve. The scheme is verified on the New Eng-land 39-bus power system and benchmarked with the result from the traditional continuation power flow method.