IEC TS 62786-2:2026

Overview

IEC TS 62786-2:2026, developed by the International Electrotechnical Commission (IEC), provides supplemental requirements for the connection of solar photovoltaic (PV) generation systems to electric power networks. Building on IEC TS 62786-1, this Technical Specification outlines essential criteria for integrating PV systems of all sizes into low and medium voltage power networks. Its scope is limited to grid-connected PV systems categorized as grid-tied, grid-tied with storage, and grid-tied with storage and backup. Mini-grid and micro-grid configurations are excluded.

The document establishes a harmonized approach to ensure safe, reliable, and efficient interconnection of PV systems, supporting both utility operators and system integrators in addressing modern grid requirements.

Key Topics

IEC TS 62786-2:2026 specifies several technical aspects for PV system grid integration, including:

• Reference Points of Requirements: Defines requirements at key locations-point of connection (POC), point of common coupling (PCC), and in-plant point of coupling (IPC).
• Elements and Configuration: Addresses system variants such as grid-tied and grid-tied with storage, and provides typical configurations for both single and multi-unit setups.
• Basic Operation: Sets accuracy and control requirements for output power, power factor, and the system’s response to voltage, frequency, and other grid events.
• Protection and Fault Ride Through: Outlines protection mechanisms for over/under voltage, frequency anomalies, and specifies ride-through capabilities allowing PV systems to remain connected during short-term faults.
• Power Control and Grid Support: Details control functions such as active and reactive power management, automatic connection/reconnection, and grid support functionalities.
• Electromagnetic Compatibility (EMC): Specifies requirements for managing low-frequency conducted disturbances and harmonics to maintain network power quality.
• Information Exchange: Defines provisions for remote monitoring, control, and configuration, including data exchange between the PV system and utility operators for operational status, performance, and protection features.

Applications

This standard is crucial for a range of stakeholders working with PV systems:

• System Integrators and Installers: Ensures correct configuration and compliance when connecting PV systems of any size to the utility grid, whether they are stand-alone grid-tied systems or feature integrated storage solutions.
• Utilities and Grid Operators: Provides a clear framework for assessing PV system connection requests, evaluating technical compliance, and facilitating active grid management.
• Manufacturers: Guides development of PV equipment-including inverters, switches, transformers, and communication interfaces-to guarantee compatibility and interoperability with network requirements.
• Regulatory Bodies: Supports the development and enforcement of national or regional grid codes related to renewable energy integration.

Practical value stems from standardized requirements that help maintain grid stability and safety while promoting the integration of solar power into existing infrastructures. The emphasis on information exchange paves the way for smarter grid monitoring and control, supporting the transition to distributed energy resources.

Related Standards

IEC TS 62786-2:2026 is designed to supplement and align with related international standards, including:

• IEC TS 62786-1: General requirements for distributed energy resources connection with the grid
• IEC 60255 series: Functional requirements for protection relays (over/under voltage and frequency)
• IEC 61000 series: Electromagnetic compatibility standards for power quality and conducted disturbances
• IEC TS 62910, IEC TS 63217: Test procedures for PV inverter ride-through capabilities
• IEC 61724-1: Monitoring and performance indices for PV systems
• IEC TS 62786-3: (when published) Grid connection requirements for electrical energy storage systems

By following IEC TS 62786-2:2026, stakeholders ensure that PV generation systems are grid-ready, meeting current and future demands for reliability, safety, and effective integration of renewable energy sources.