Harmonics & Reactive Power Solutions

Harmonic distortion and reactive power are two of the most common — and most costly — power quality issues in modern electrical installations. Technical Solutions provides engineering analysis and corrective solutions for both.

Harmonic Distortion

Non-linear loads such as variable speed drives, UPS systems, rectifiers, and LED lighting inject harmonic currents into the electrical supply. These harmonics cause:

• Overheating of transformers, cables, and neutral conductors
• Interference with sensitive electronic equipment and control systems
• Increased losses and reduced energy efficiency
• Premature failure of capacitors and other power factor correction equipment
• Voltage distortion that affects all connected loads

Correction Strategies

• Active harmonic filters (AHF) — inject compensating currents in real time to cancel harmonics at source
• Passive harmonic filters — tuned LC circuits that absorb specific harmonic frequencies
• Multi-pulse rectifiers — phase-shifting transformers that cancel harmonics through winding configuration
• Isolation transformers — providing galvanic separation and reducing harmonic propagation between circuits
• Network design improvements — separating harmonic-producing loads from sensitive circuits

Reactive Power Issues

Reactive power is the non-working component of electrical power that flows back and forth between source and load. Excessive reactive power causes:

• Increased current flow for the same useful power delivery
• Higher losses in cables, transformers, and generators
• Reduced available capacity in the electrical network
• Utility penalty charges for poor power factor
• Voltage drop at the point of use

Correction Strategies

• Fixed capacitor banks — for installations with stable, predictable reactive power demand
• Automatic power factor correction (APFC) — stepped capacitor banks with automatic controllers that adjust correction to match load variations
• Detuned capacitor banks — capacitors with series reactors that prevent harmonic amplification in networks with significant harmonic content
• Static VAR compensators — for rapid, dynamic reactive power compensation in demanding applications
• Active power factor correction — combined harmonic filtering and reactive power correction in a single device

System Improvement Outcomes

Effective harmonic and reactive power correction delivers measurable benefits:

• Reduced energy consumption and lower electricity bills
• Elimination of utility power factor penalties
• Extended equipment life through reduced electrical stress
• Improved voltage stability at the point of use
• Increased available capacity in existing electrical infrastructure
• Compliance with utility connection requirements and international standards

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