Disadvantages of the harmonics present in the inverter system

  1. Harmonic currents will lead to excessive heating in the induction motors. This will reduce the load carrying capacity of the motor.
  2. If the control and the regulating circuits are not properly shielded, harmonics from power ride can affect their operation and malfunctioning can result.
  3. Harmonic currents cause losses in the ac system and can even some time produce resonance in the system. Under resonant conditions, the instrumentation and metering can be affected.
  4. On critical loads, torque pulsation produced by the harmonic current can be useful.