Overview
IEC TR 61850-90-10:2017 is a technical report published by the International Electrotechnical Commission (IEC) under the IEC 61850 series dedicated to communication networks and systems for power utility automation. Specifically, Part 90-10 addresses models for scheduling devices using the IEC 61850 standard, enabling more efficient and autonomous management of Distributed Energy Resources (DER) and related equipment.
This document outlines standardized approaches for modeling scheduling functions, facilitating time-based control over various power utility devices. By defining how scheduling can govern device behavior autonomously, IEC TR 61850-90-10 helps utilities optimize grid operation, reduce manual interventions, and support advanced smart grid applications.
Key Topics
- Scheduling Models: Describes the structure and implementation of schedules within the IEC 61850 data model, supporting both direct value assignments and mode or parameter activations.
- Schedule Controllers: Explains the concept of schedule controllers, which manage one or more schedules for a given device or “scheduled entity.”
- Integration with Direct Control: Outlines how scheduling interacts with direct control mechanisms, ensuring harmonious operation and transition between scheduled and direct control states.
- Behavior and Operation: Details expected schedule behaviors, including periodic, single-event, and event-driven scheduling, as well as state machines for managing schedule lifecycles.
- Schedule Structure: Specifies the key data elements that constitute a schedule, such as priorities, states, entry values, intervals, and enable/disable requests.
- Managing Multiple Schedules: Describes handling concurrent schedules, schedule prioritization, and controller selection logic.
- Abbreviated Terms and Data Objects: Introduces common abbreviations and artifacts required for consistent schedule modeling.
Applications
IEC TR 61850-90-10 provides practical value for a wide range of power utility automation applications, including:
- Distributed Energy Resource (DER) Control: Enables DER systems, such as solar, wind, and storage, to follow preconfigured power output profiles autonomously through scheduled commands.
- Load and Resource Scheduling: Facilitates the automation of demand response programs by allowing loads or resources to change setpoints or operational modes based on a scheduling plan.
- Grid Optimization: Supports local and system-wide optimization strategies (e.g., Volt-VAR optimization, peak shaving) by activating different device characteristics or constraints at predetermined times.
- Reduced Communication Load: By sending schedules infrequently and enabling local schedule-driven behavior, utilities can minimize bandwidth usage and reduce dependency on continuous communication.
- Event-Driven or Time-Based Operations: Schedules can trigger operations based on calendar events, time-of-day, or external triggers, enhancing flexibility for utility operators.
Related Standards
The scheduling models and data structures defined in IEC TR 61850-90-10 align with and extend foundational elements from other parts of the IEC 61850 series, such as:
- IEC 61850-7-1: Basic communication structure, principles, and models for power utility automation.
- IEC 61850-7-2: Abstract communication service interface (ACSI) definitions.
- IEC 61850-7-3: Common data classes (CDCs) foundational for device data modeling.
- IEC 61850-7-4: Logical node and data object classes used throughout IEC 61850 implementations.
This technical report is intended to serve as a transitional namespace, with its models planned for eventual integration into future editions of IEC 61850-7-4 and IEC 61850-7-3, thereby supporting long-term interoperability in smart grid automation.
Keywords: IEC 61850 scheduling, power utility automation standards, DER schedule modeling, smart grid communication, schedule controller, distributed energy resources, IEC TR 61850-90-10 applications, IEC 61850-7-4, grid optimization, time-based device control.