Abstract: There is provided methods and apparatus configured to provide electrical converter control parameters, the apparatus comprising: a Structured H-infinity tuning module configured to determine one or more control parameters, for a model of an electrical converter control system and grid, based on variation of one or more grid parameters; and an output module configured to provide the one or more control parameters for implementation in the electrical converter control system.

Abstract: A method for identifying a faulted DC power transmission medium in a multi-terminal DC electrical network is provided. The DC electrical network includes multiple terminals connected via DC power transmission media. The method includes detecting a fault occurring in the DC power transmission media and, after detecting the fault, measuring a surge arrival time at each terminal, each surge arrival time being the difference between the time of detecting the fault and the time of arrival of an electrical wave surge generated by the fault at the corresponding terminal. The method further includes comparing the surge arrival times between the terminals to identify DC power transmission media in which the fault is not located, allocating a healthy status to the media in which the fault is not located, and identifying the faulted DC power transmission medium as being the DC power transmission medium/media without a healthy status.

Abstract: In the field of high voltage direct current power transmission networks, a method of controlling a converter that includes at least one converter limb which corresponds to a respective phase of the converter, is described. The method includes obtaining a respective AC current demand phase waveform for each converter limb which the corresponding converter limb is required to track, and a DC current demand which each converter limb is also required to track. The method further determining a limb portion current for each limb portion that the limb portion must contribute to track the corresponding required AC current demand phase waveform and the required DC current demand, and providing a limb portion voltage source for each limb portion to achieve the corresponding limb portion current. The method carrying out mathematical optimization to determine one or more optimal limb portion currents and/or provide optimal limb portion voltage sources.

Abstract: In the field of high voltage direct current power transmission networks, a method of controlling a converter that includes at least one converter limb which corresponds to a respective phase of the converter, is described. The method includes obtaining a respective AC current demand phase waveform for each converter limb which the corresponding converter limb is required to track, and a DC current demand which each converter limb is also required to track. The method further determining a limb portion current for each limb portion that the limb portion must contribute to track the corresponding required AC current demand phase waveform and the required DC current demand, and providing a limb portion voltage source for each limb portion to achieve the corresponding limb portion current. The method carrying out mathematical optimization to determine one or more optimal limb portion currents and/or provide optimal limb portion voltage sources.

Abstract: A method for identifying a faulted DC power transmission medium in a multi-terminal DC electrical network is provided. The DC electrical network includes multiple terminals connected via DC power transmission media. The method includes detecting a fault occurring in the DC power transmission media and, after detecting the fault, measuring a surge arrival time at each terminal, each surge arrival time being the difference between the time of detecting the fault and the time of arrival of an electrical wave surge generated by the fault at the corresponding terminal. The method further includes comparing the surge arrival times between the terminals to identify DC power transmission media in which the fault is not located, allocating a healthy status to the media in which the fault is not located, and identifying the faulted DC power transmission medium as being the DC power transmission medium/media without a healthy status.