| 摘要 |
In the field of high voltage direct current (HVDC) power transmission networks, a method of controlling a converter that includes at least one converter limb (12A, 12B, 12C) which corresponds to a respective phase of the converter, with the or each converter limb (12A, 12B, 12C) extending between first and second DC terminals (14, 16) and including first and second limb portions (12A+, 12A-, 12B+, 12B-, 12C+, 12C-) which are separated by an AC terminal (18A, 18B, 18C), comprises the steps of:
(a) obtaining a respective AC current demand phase waveform (I A , I B , I C ) for the or each converter limb (12A, 12B, 12C) which the corresponding converter limb (12A, 12B, 12C) is required to track, and a DC current demand (I DC ) which the or each converter limb (12A, 12B, 12C) is also required to track;
(b) determining a limb portion current (I A+ , I A- , I B+ , I B- , I C+ , I C- ) for each limb portion (12A+, 12A-, 12B+, 12B-, 12C+, 12C-) that the limb portion (12A+, 12A-, 12B+, 12B-, 12C+, 12C-) must contribute to track the corresponding required AC current demand phase waveform (I A , I B , I C ) and the required DC current demand (I DC );
(c) providing a limb portion voltage source (V A+ , V A- , V B+ , V B- , V C+ , V C- ) for each limb portion (12A+, 12A-, 12B+, 12B-, 12C+, 12C-) to achieve the corresponding determined limb portion current (I A+ , I A- , I B+ , I B- , I C+ , I C- ); and
(d) carrying out mathematical optimization to determine one or more optimal limb portion currents (I A+ , I A- , I B+ , I B- , I C+ ) and/or provide optimal limb portion voltage sources (V A+ , V A- , V B+ , V B- , V C+ , V C- ). |
