This power and electricity control technology is vital for businesses across the UK. With our help, your business is able to improve the way that energy is harnessed, and this makes power transfer much more sustainable. At present, this technology is used with electricity-only grids, but we’d love to expand this to renewable technologies.
We work with your company to capture requirements and architect the logical and physical structure for the control of high voltage direct current converters. We then guide these into the design and implementation of the control system. With more than 20 years of experience in the field, we are experts in the power systems. Choose us for the best advice on design and implementation of a control system.
Control system design is available for the control of either line commutation convertor or voltage source converter valves. The control strategies are very different for these two technologies.
This is a mature technology, and it has been used in HVDC schemes for decades. Based on the high-power thyristor, the control of the output voltage and thus the current flow between terminals is achieved using pulse width modulation techniques. This requires the controls to be able to operate at a high speed, with precise timing control. This is the only way to achieve the desired response. LCC is best suited to point-to-point bulk power transfers. The addition of further terminals creates exponentially more complex control requirements.
VSC is a newer technology, and it is growing in installed base and maturity. Unlike with LCC, the output voltage can be stepped to give more control to the system. This makes VSC suitable for multi-terminal applications, such as the proposal of DC supergrids. The technology used in this approach is the insulated gate bipolar transistor (IGBT). This device can be turned on and off, whereas it is only possible to turn on a thyristor. A thyristor turns off automatically when the current flow crosses zero to block the reverse current flow.
We also provide LCC and VSC testing verification, working with the equipment manufacturer and the customer to ensure that the final solution meets the requirements. To test these devices, a test facility must be able to generate real-world equivalent voltages and currents.