Effects of Load-Based Frequency Regulation on Distribution Network Operation

TL;DR

This study investigates how load-based frequency regulation by thermostatically controlled loads impacts distribution network constraints, highlighting increased voltage violation risks and the importance of voltage constraints in control strategies.

Contribution

It provides a comparative analysis of distribution network operation with and without TCL regulation, emphasizing voltage constraint considerations for network safety.

Findings

Voltage limits are at higher risk of violation with TCL regulation.

Transformer aging effects depend on TCL dispatch methods.

Voltage constraints are crucial in TCL control strategy design.

Abstract

This paper examines the operation of distribution networks that have large aggregations of thermostatically controlled loads (TCLs) providing secondary frequency regulation to the bulk power system. Specifically, we assess the prevalence of distribution network constraint violations, such as over- or under-voltages and overloading of transformers. Our goal is to determine the set of constraints that are at increased risk of being violated when TCLs provide regulation. We compare network operation in two cases: first with TCLs operating freely, and second with TCLs controlled to track a regulation signal. Using GridLAB-D, we run power flow simulations of five real distribution networks. Our results indicate that voltage limits are at increased risk of violation when TCLs provide regulation because of increased voltage variation. Effects on transformer aging are more nuanced and depend on the method used for dispatching TCLs. We find that in many distribution networks it may only be necessary to consider voltage constraints when designing a TCL control strategy that protects the distribution network.