| 摘要 |
A controller (40), for controlling a multiphase voltage source converter, comprises a vector control module (42) that is configured to generate multiphase voltage demand waveforms ( v a , v b , v c ) that the voltage source converter subsequently is required to provide. The vector control module (42) generates the multiphase voltage demand waveforms ( v a , v b , v c ) from respective converter voltage output phase waveforms ( V a , V b , and V c ) that are measured at corresponding AC outputs of the voltage source converter. The vector control module (42) includes a transformation element (44) which is configured to transform the respective converter voltage output phase waveforms ( V a , V b , and V c ) into symmetrical sequence rotating reference frame terms. The vector control module (42) also includes a distortion element (46) that is configured to introduce harmonic distortion into the generated multiphase demand waveforms ( v a , v b , v c ). The distortion element (46) includes a time-varying conversion element (48) that is configured to convert the symmetrical sequence terms directly into respective time-varying waveforms (58, 60, 62, 68, 70, 72), and a manipulation element (74) which is configured to carry out non-trigonometric manipulation of the time-varying waveforms (58, 60, 62, 68, 70, 72) to introduce the said harmonic distortion into the generated multiphase voltage demand waveforms ( v a , v b , v c ). |
