Abstract

This paper presents a systematic framework to evaluate the performance of conservation voltage reduction (CVR) by determining suitable substations for CVR in operations planning. Existing CVR planning practice generally only focuses on the energy saving aspect without taking other underlying attributes into account, i.e., network topology and reduced voltage effects on other substations. To secure the desired operating reserve and avoid any adverse impacts, these attributes should be considered for implementing CVR more effectively. This research develops a practical decision-making framework based on the analytic hierarchy process (AHP) to quantify several of the aforementioned attributes. Candidate substations for CVR deployment are prioritized such that performances are compared in terms of power transfer distribution factor (PTDF), voltage sensitivity factor (VSF), and CVR factor. In addition, to meet a specified reserve requirement, an integer programming approach is adopted to select potential substations for CVR implementations. Case studies for a Korean electric power system under diverse operating conditions are performed to demonstrate the effectiveness of the proposed method.

Highlights

  • Conservation voltage reduction (CVR) has been implemented by many electric power utilities for decades as a practical method to decrease peak demand and save energy by lowering the voltage level on distribution systems in a controlled manner [1]

  • power transfer distribution factor (PTDF) and voltage sensitivity factor (VSF) are studied according to the targeted area, whereas CVR factor (CVRf) are obtained from all substations

  • This paper has presented a practical method for planning CVR on a transmission system based on analytic hierarchy process (AHP)

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Summary

Introduction

Conservation voltage reduction (CVR) has been implemented by many electric power utilities for decades as a practical method to decrease peak demand and save energy by lowering the voltage level on distribution systems in a controlled manner [1]. This paper is, motivated to improve the existing practice of CVR planning It is often based on a fixed planning case and focuses on demand reduction without investigating other critical aspects of CVR, for example its impacts on secured operating reserves and voltage profiles of the adjacent buses, which will be detailed in this paper. For example, network topology and loading conditions can be reflected in the study to provide more reliable and predictable CVR performance in conjunction with the network security analysis that EMS performs at every operating period; the desired CVR performance can be specified.

Conservation Voltage Reduction
Power Transfer Distribution Factor
Voltage Sensitivity Factor
Overview of AHP
Unified Weighting Factor
Determination of Candidate Substations
Test System
CVRf for the Test System
PTDF for the Test System
VSF for the Test System
AHP and ILP for the Test System
Results
Effect of CVR on the Network
Simulation Scenarios
Conclusions
Full Text
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