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Ancillary service market designs may require changes in systems with greater penetration of variable RE, particularly wind. This paper explores design considerations that take into account economics and engineering. The authors examine current market design, services pricing and cost allocation, changes to existing designs, and the potential for new designs. The report focuses on load following, frequency response, inertial response, and reactive power/voltage control.
Located in Integration Topics / Ancillary Services / Ancillary Services folder
This report explores how various balancing areas in North America provide ancillary services and addresses regulatory institutional practices for maintaining system integrity. The report surveys different practices that balancing areas use to plan for and manage the provision of ancillary services and makes recommendations related to enlarging and/or increasing the coordination among balancing areas to provide ancillary services. The authors seek to clarify the balancing area rules that each entity much follow, and how the many balancing areas in North America can operate in a homogenous way to address ancillary service requirements for variable RE generation.
Located in Integration Topics / Ancillary Services / Ancillary Services folder
This report examines the three forms of active power controls that wind may be able to support, including synthetic inertial control, primary frequency control, and automatic generation control regulation. These controls contribute ancillary services to the power system. The study analyzes millisecond timeframes to characterize the impact of using wind to provide active power controls on the lifetimes of large wind plants as well as on the broader power system. The authors explore the implications of active power controls on economics and power system engineering control design. They conclude that wind may earn additional revenue and reduce production costs to consumers by providing power control services, and that market design, reliability criteria, and engineering design will impact future opportunities for wind generators to provide these services.
Located in Integration Topics / Ancillary Services / Ancillary Services folder
This document includes a summary of the Spanish power system schedule (page 5) and electricity price stacks with ancillary services broken out (page 13). The report also includes a chart showing the impact of wind on primary, secondary, tertiary, and supplemental reserves (page 27). Also included is a description of Spain’s RE generation control center.
Located in Integration Topics / Ancillary Services / Ancillary Services folder
This report first provides a characterization of the various types of reserves, followed by a summary of how reserves are applied internationally currently, and how reserves could be managed in the future. The purpose of the assessment is to understand differences and commonalities between practices and to suggest options for improved practices, especially under higher variable RE penetration scenarios.
Located in Integration Topics / Ancillary Services / Ancillary Services folder
This report describes state-of-the-art practices with respect to variable generation integration. The report is predominantly based on an extensive literature review and includes highlights of ancillary service requirements for distributed generation in Germany and Spain. Pages 167 – 177 contain information on regional ancillary service practices in the United States.
Located in Integration Topics / Ancillary Services / Ancillary Services folder
This discussion paper from the India's Central Energy Regulatory Commission examines the impetus for developing an ancillary services market and focuses on the services of frequency support, voltage control, and black start. The report also explores challenges for developing an ancillary services market and is the first step in a stakeholder engagement process intended to inform any regulatory actions taken by the commission.
Located in Integration Topics / Ancillary Services / Ancillary Services folder
The Electricity Reliability Council of Texas (ERCOT), a U.S. independent system operator with relatively high wind penetration is exploring new possibilities for its ancillary services planning and procurement processes. This analysis is intended to inform potential market redesigns that take into account an evolving resource mix (including higher levels of variable RE) in an effort to better address the challenges of these new resources, and to better utilize existing and new resources. This report focuses on frequency control and does not address emergency response service, voltage support, reliability must-run, and black-start.
Located in Integration Topics / Ancillary Services / Ancillary Services folder
This study summarizes the results of an in-depth modeling of the U.S. Eastern Interconnection, wind integration study, and transmission analysis. The study examines various technical issues under a 20% wind integration scenario. Section 5 examines power system regulation and balancing, and Section 6 explores impacts on systems operation. The report assesses ancillary services that provide both spinning and nonspinning reserves and offer frequency response, balancing, and system security.
Located in Integration Topics / Ancillary Services / Ancillary Services folder
In 2011, the California Independent System Operator (CAISO) began a stakeholder engagement process to develop a market-based ramping product. The stakeholder engagement process will also help inform how ramping costs could be allocated to generation and demand. The CAISO website includes information on the initiative status, current meetings, and tariff and policy development.
Located in Integration Topics / Ancillary Services / Ancillary Services folder
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