Memory-Based Set Point Modulation for Improved Transient Response of Distributed Energy Resources

TL;DR

This paper introduces a memory-enhanced SPAACE control method for distributed energy resources, improving transient response and reducing overshoot at lower sampling rates without tuning PI controllers.

Contribution

It adds a memory term to SPAACE with a linear predictor, enhancing performance and practicality in DER transient response control.

Findings

Improved transient response at lower sampling rates.

Reduced overshoot and settling time.

Effective in PSCAD/EMTDC simulations.

Abstract

As the composition of the power grid evolves to integrate more renewable generation, its reliance on distributed energy resources (DER) is increasing. Existing DERs are often controlled with proportional integral (PI) controllers that, if not properly tuned or if system parameters change, exhibit sluggish performance or large overshoot. The use of set point automatic adjustment with correction-enabled (SPAACE) with a linear predictor improves the transient response of these DERs without the need to access the PI controller parameters. The limitation of the existing SPAACE method is the high sampling rate needed for improved performance, which is not always practical. This paper proposes the addition of a memory term to the SPAACE with a linear predictor. This memory term is the integral of the errors of previous samples, which adds another layer to the prediction to improve the response at lower sampling rates and further reduces the overshoot and settling time compared to the existing SPAACE method. Time-domain simulation studies are performed in PSCAD/EMTDC to show the effectiveness of the proposed controller.