G5/5 Harmonics Study
Analyzes harmonic emissions from power-electronic devices (like inverters) to ensure that voltage distortions injected into the grid comply with the strict power quality limits of EREC G5/5.
Modern electrical grids are experiencing an unprecedented integration of power electronics, such as solar inverters and battery storage systems. To prevent severe power quality degradation, grid operators enforce strict limits on high-frequency waveform distortions—known as harmonics. Whenever a new asset utilizing non-linear power electronics is proposed, a Harmonics Analysis is fundamentally required to ensure compliance with stringent national power quality standards (such as Engineering Recommendation G5/5 in the UK).
Exceeding statutory harmonic limits can completely halt a project's energization, forcing developers into costly late-stage redesigns or the procurement of incredibly expensive active harmonic filters. Our analysis provides clear, data-driven visibility into your facility's power quality impact. By forecasting realistic harmonic profiles early in the development cycle, we help you secure final grid connection agreements and advance to the construction phase without the threat of unexpected mitigation costs.
We tailor our assessment to your project's specific network constraints and regulatory stage. For early-stage feasibility or less constrained nodes (such as G5/5 Stage 1 or 2 assessments), we synthesize localized background measurements, fault levels, system X/R ratios, and equipment emission limits to establish a baseline distortion estimate. However, for sensitive grid areas requiring rigorous proof of compliance (such as a comprehensive Stage 3 assessment), we deploy advanced frequency-domain modeling. We construct a digital model of the network's frequency-dependent impedance, running extensive simulation sweeps that pair background profiles with exact cable capacitances and manufacturer-specific inverter data.
Crucially, we leverage an often-overlooked electrical reality: adding new harmonic sources to a grid does not automatically make the situation worse. In many cases, through natural harmonic cancellation, phase angle diversity, and strategic plant design, connecting a new asset can actually improve the pre-existing distortion profile of the local network. By mathematically simulating how high-frequency currents flow and resonate under worst-case conditions, we deliver highly accurate compliance figures that frequently prevent the unnecessary procurement of expensive harmonic filtration hardware.
