IEC TR 63575:2025

Overview

IEC TR 63575:2025 - Performance of power electronic reactive power shunt compensators in high voltage alternating current (HVAC) systems is a Technical Report from the IEC that provides general guidelines on the performance of power‑electronic shunt reactive compensators (for example, SVC and STATCOM) connected to high‑voltage AC networks. The document defines terms, symbols and metrics, gives an introductory overview, describes application contexts and presents performance topics and practical guidance, with illustrative case studies in Annex A.

Key topics and technical requirements

IEC TR 63575:2025 focuses on performance and behavior issues that are critical for reliable integration of shunt compensators into HVAC systems, including:

• Definitions and performance metrics: clear definitions for terms such as point of common coupling (PCC), voltage‑sourced converter (VSC), step response time and settling time.
• Device overview: distinctions between SVC (thyristor‑based) and STATCOM (VSC‑based) topologies and hybrid static var system configurations.
• Performance requirements and tests: guidance on dynamic response (step response and settling time), behaviour on weak systems and coordination with nearby reactive devices.
• Grid‑interaction phenomena: fault ride‑through, negative‑sequence control, subsynchronous resonance and oscillation, power oscillation damping (POD), harmonic interaction and geomagnetically induced currents (GIC).
• Control and coordination: recommended approaches for POD, subsynchronous damping controllers and harmonics coordination to avoid adverse interactions.
• Informative implementation examples: real‑world SVC and STATCOM applications across transmission and generation sites (Annex A).

Practical applications and who uses the standard

This Technical Report is practical for professionals and organizations involved with planning, specifying, procuring, installing and operating reactive power compensation equipment in HVAC systems:

• Transmission and distribution system operators (TSOs/DSOs)
• Power plant owners and integrators
• Power electronics and grid equipment manufacturers
• Grid planners and consultants evaluating voltage control, stability and harmonic compliance
• Protection and control engineers developing control strategies for fault ride‑through, POD and SSR mitigation
• Regulators and standards developers seeking harmonized performance guidance

IEC TR 63575 helps users assess dynamic performance, ensure safe grid participation, coordinate multiple compensators and mitigate stability and harmonic risks.

Related standards and resources

• The Technical Report references terminology and related IEC publications used in definitions (for example, IEC 62747, IEC 62927, and entries from IEC Electropedia / IEC 60050).
• As a non‑normative TR, it complements product, testing and grid‑code standards and should be used alongside applicable national/regional regulations and equipment standards.

Keywords: IEC TR 63575:2025, reactive power shunt compensators, SVC, STATCOM, HVAC systems, fault ride‑through, power oscillation damping, harmonics, grid stability.