Overview
IEC TS 62001-2:2026 is an International Electrotechnical Commission (IEC) Technical Specification that provides essential guidance for the specification and design evaluation of AC filters in high-voltage direct current (HVDC) systems, focusing especially on harmonic performance aspects. The document is highly relevant to both line-commutated converters and voltage source converter (VSC) HVDC technology, with particular emphasis on passive AC filter solutions.
Harmonic distortion in HVDC systems can affect not only system efficiency and equipment life but also cause external disturbances such as audible noise and telephone interference. IEC TS 62001-2:2026 addresses practical engineering considerations, supporting utilities, consultants, and engineers in ensuring that harmonic emissions remain within acceptable limits and that compliance is verified effectively.
Key Topics
This standard covers three primary areas vital for the design and operation of HVDC AC side filters:
- Telephone Interference:
Evaluates the risks and provides methods for determining the necessity and derivation of harmonic limits to minimize interference with nearby telephone communications. Criteria such as Telephone Interference Factor (TIF) and IT (the product of RMS current and TIF) are discussed.
- Current-based Harmonic Criteria:
Outlines guidelines for setting and applying current-based performance criteria to control harmonics. This includes practical methods to assess harmonic current flow, define appropriate limits, and align specifications with project requirements.
- Field Measurement & Compliance Verification:
Provides direction on planning and executing measurements to verify that actual system performance aligns with specified harmonic limits. This section is crucial for confirming performance both at commissioning and during ongoing operation.
The document also highlights scenarios where AC filter design must consider specific system configurations, exposure conditions, and local telecommunication practices.
Applications
IEC TS 62001-2:2026 is a valuable reference for:
- HVDC Project Specification:
Assists utilities, consultants, and EPC contractors in drafting robust specifications for new HVDC projects, ensuring harmonic performance is addressed proactively.
- Filter Design and Evaluation:
Supports manufacturers and engineers in selecting and verifying passive AC filter solutions to control harmonic distortion and meet performance requirements.
- Mitigation of External Disturbances:
Offers guidance to telecommunications providers and system planners in identifying and addressing potential electromagnetic interference from HVDC transmission lines.
- Operational Compliance:
Facilitates ongoing compliance monitoring, including periodic field measurements and reporting, to ensure sustained power quality and adherence to regulatory limits.
The technical guidance provided by this document is relevant to a wide range of HVDC configurations, especially where maintaining power quality and avoiding interference with adjacent infrastructure is a priority.
Related Standards
IEC TS 62001-2:2026 is part of the broader IEC 62001 series, which addresses various aspects of AC filter specification and performance in HVDC systems. Related and referenced standards include:
- IEC TR 62001-1:
Overview of AC filter specifications, permissible distortion, and performance calculation.
- IEC TS 62001-3:
Modelling aspects pertinent to AC network impedance, existing harmonics, and harmonic interactions.
- IEC TR 62001-4:
Equipment considerations, including ratings, losses, audible noise, and seismic requirements.
- IEC TR 62001-5:
Harmonic limits and performance for VSC-HVDC systems.
- IEC 61000 Series:
International standards for electromagnetic compatibility (EMC) and harmonic limits.
- IEEE Std 368 and IEEE 519:
Industry benchmarks for harmonic control and telephone interference criteria.
Practical Value
Conformance with IEC TS 62001-2:2026 ensures that HVDC projects incorporate industry best practices for harmonic performance, mitigating technical and regulatory risks associated with harmonic emissions and external interference. By clearly understanding and applying the guidance within this IEC standard, organizations can enhance grid reliability, protect adjacent infrastructure, and uphold power quality in increasingly complex transmission environments.
Keywords: HVDC systems, IEC 62001-2, AC filters, harmonic performance, telephone interference, harmonic limits, power quality, design evaluation, field measurement, compliance verification, passive filter technology, IEC standards.