| 摘要 |
This application relates to a voltage source converter (VSC), especially for use in High Voltage Direct Current (HVDC) power distribution/transmission, and to methods of control of such a VSC. The VSC (200) has at least one phase limb having a high-side DC terminal (DC+), a low-side DC terminal (DC-) and an AC terminal (202). In embodiments of the invention each phase limb comprises a voltage wave-shaper (204) operable, in use, to provide a selectively variable voltage level (VWS). Each phase limb also has a switch arrangement (SU1, SU2, SL1, SL2) operable to provide at least first and second switch states. In the first switch state the low-side DC terminal (DC-) is electrically connected to the AC terminal (202) via a first path (301 ) that includes the voltage wave-shaper (204). In the second switch state the high-side DC terminal (DC+) is electrically connected to the AC terminal (202) via a second path (302) that includes the voltage wave-shaper (204). |
