New Ancillary Service Market for ERCOT

Pengwei Du,Tao Ding,Qinran Hu,Sandip Sharma,Nitika V Mago,Weifeng Li

doi:10.1109/access.2020.3027722

Pengwei Du, Tao Ding + Show 4 more

Open Access

https://doi.org/10.1109/access.2020.3027722

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Journal: IEEE Access	Publication Date: Jan 1, 2020
Citations: 49	License type: CC BY 4.0

Affiliation: Xi'an Jiaotong University, Southeast University

Abstract

Ancillary services (AS) are the services necessary to support the transmission of electric power from generators to consumers given the obligations of control areas and transmitting utilities within those control areas to maintain reliable operations of the interconnected transmission system. As a result of the increasing penetration of renewable resources, the new reliability needs are emerging so that the changes made to the AS market become necessary. This paper presents a new AS framework being implemented at the Electric Reliability Council of Texas (ERCOT) in order to address the primary frequency control issues associated with the declining system inertia. This new design can balance the need for both reliability and economics while opening up the AS market to the traditional and non-traditional resources, including load resources with under-frequency relays and energy-limited resources like batteries. This paper also introduces a new way to quantify the benefits of the new AS design using ERCOT model and data.

Highlights

Following Federal Energy Regulatory Commission (FERC) order 888, the U.S power industry began its restructuringThe associate editor coordinating the review of this manuscript and approving it for publication was Ning Kang .process [1]
This paper presents a new framework to re-design ancillary service (AS) market, which is being implemented at Electric Reliability Council of Texas (ERCOT) in the anticipation of the reliability need arising from a declining system inertia
Regulation service is provided by the resources that can be deployed every four seconds to compensate for the load or generation variations within the security constrained economic dispatch (SCED) time intervals, i.e., ERCOT sends load frequency control (LFC) signal every four seconds to increase or decrease power output to the generators providing regulation services

Summary

INTRODUCTION

Following Federal Energy Regulatory Commission (FERC) order 888, the U.S power industry began its restructuring. In [28], [29], an energy, inertia and reserve co-optimization formulation was proposed in which the PFR requirement can be met by synchronous generators and load resources. These theoretic works reported in [20]–[29] have been performed assuming that no changes are applied to existing AS products. Regulation service is provided by the resources that can be deployed every four seconds to compensate for the load or generation variations within the SCED time intervals, i.e., ERCOT sends load frequency control (LFC) signal every four seconds to increase or decrease power output to the generators providing regulation services. A low net-load case could lead to fewer generators committed online, reducing the system inertia

OVERVIEW OF FREQUENCY CONTROL COORDINATION AT ERCOT

NEW ANCILLARY SERVICE MARKET

MAXIMUM AMOUNT OF FFR ALLOWED

IMPACT OF FFR OVER CRITICAL INERTIA

Findings

VIII. CONCLUSION