Virtual Impedance Based Selective Harmonic Compensation (VI-SHC) PWM
Date
Author
Institution
Degree Level
Degree
Department
Specialization
Supervisor / Co-Supervisor and Their Department(s)
Examining Committee Member(s) and Their Department(s)
Citation for Previous Publication
Link to Related Item
Abstract
A low-switching PWM scheme is presented for a high power current source rectifier (CSR) system to actively compensate the grid background harmonics and improve the line current harmonic performance. The PWM scheme described above is placed in context with the existing techniques review of the traditional selective harmonic elimination (SHE) and the recently developed selective harmonic compensation (SHC) PWM. The switching angles calculation method based on the global optimization approach is designed to develop a user-friendly software tool for the SHE and SHC PWM switching angles calculation. A novel virtual impedance based selective harmonic compensation (VI-SHC) PWM scheme is described in the thesis with a view to overcoming the disadvantages of the SHE and SHC PWM methods existing in the implementation. The VI-SHC PWM does not require to measure the grid voltage harmonics, does not rely on an accurate CSR system model, and therefore is very robust for practical implementation.