By D. Grahame Holmes;Thomas A. Lipo
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Extra resources for Pulse Width Modulation for Power Converters Principles and Practice
In reality, the slopes corresponding to the rapidly changing di/dt would not be infinite but would change at a rate dominated by the capacitance of a commutating circuit. 17 is widely used for implementing a current source/stiff converter. Alternatively, capacitive filters can be placed on AC output terminals to absorb the rapid changes in current. 16 Current source inverter waveforms: (a) line current for a star-connected load and (b) phase current for a deltaconnected load assuming a DC link current of 100 A.
76) Examination ofEq. 72) identifies that the line-to-neutral voltage can take on seven distinct values, namely ±4 Vde/3, ±Vde , ±2 Vde/3, and zero. 26 shows the switched phase leg, line-to-line and line-to-neutral phase voltages for a three level NPC inverter, where the phase legs are switched with a 30° zero voltage plateau between the +Vdc and the -Vdc steps to achieve minimum total harmonic distortion (THD). 10. The fundamental component of the load voltage can now be determined by calculating the fundamental component of the voltage from one phase leg to Three-Level Inverters 41 I " 1 - (a) - - - - - 1- - - - - - -, - I - - - - - -y - - - - - - r 1 - - - - - - ,- - I 1 , , I I 1 I 1 1 , 1 , I , - - - - - - - 0 a .
Adding together the voltages of Eq. 16. 16 would produce infinite spikes of voltage. Hence, strictly speaking, the harmonic content for this converter is infinite. In reality, the slopes corresponding to the rapidly changing di/dt would not be infinite but would change at a rate dominated by the capacitance of a commutating circuit. 17 is widely used for implementing a current source/stiff converter. Alternatively, capacitive filters can be placed on AC output terminals to absorb the rapid changes in current.
Pulse Width Modulation for Power Converters Principles and Practice by D. Grahame Holmes;Thomas A. Lipo