SINUS K
INSTALLATION
INSTRUCTIONS
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191
Solving the problem
Harmonic current amplitude decreases when frequency increases; as a result, reducing high-amplitude
components determines the filtering of low-frequency components. The better way is to increase low-frequency
impedance by installing an inductance. Power drive systems with no mains-side inductance generate larger
harmonic currents than power drives which do have an inductance. Unlike DC inductance, AC inductance
suppresses most harmonic currents and protects the rectifier from supply voltage peaks.
For >500kW drives, a
12-pulse
inductance is normally used. This suppresses the lowest harmonic current in the
supply line. In a 12-pulse inductance, the lowest harmonics are the 11th and the 13th, followed by the 23rd, the
25th and so on, with their relevant low levels. The supply current shape is very similar to a sinusoid. A different
solution to suppress this problem consists in powering the inverter with DC voltage supply using a regenerative
inverter: current absorbed by the mains is perfectly sinusoidal, and the regenerative inverter recovers energy to
the mains when the motor is regenerating.
NOTE
DC-side inductance can be connected only to inverters sizes from S15 on (to be
stated when ordering the equipment).
NOTE
When a DC-side inductance is used, it is sometimes possible that no braking
resistor or external braking unit can be connected to the inverter.
Содержание SINUS K
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