General Electric Technology Gmbh

Antonios Tzimas

Andrzej Adamczyk

Kevin J Dyke

Rosemary King

Guillaume Lucas

Kevin James Dyke

There is disclosed a controller () for a power electronic network element () of a power transmission network (), wherein the controller () is configured to vary a control parameter of the network element () which at least partly determines a ripple profile in a transmission line of the network. The controller () is configured to vary the control parameter between at least a first value and second value to cause the ripple profile in the transmission line to change; and the controller is configured to vary the control parameter periodically or in response to a signal indicating a threshold temperature at a hotspot location along the transmission line. A method of optimising control parameters for a power transmission network () is also disclosed.

Ripple control and optimisation in a power transmission network

The present invention provides methods and apparatus for controlling HVDC power transmission systems so as to increase the effective lifetime of cables carrying the DC power (and particularly the extruded polymer insulation of those cables). The method includes entering a maintenance mode in which the electrical properties applied to the cable are varied so as to facilitate diffusion of space charge accumulation in the extruded polymer insulation.

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Stafford, United Kingdom

Antonios Tzimas