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In this paper, a type of high power DC-DC converter based on IGBT switches is proposed. Basically, the converter consists of two bidirectional IGBT bridges linked by a pair of energy storage capacitors. It is capable of MW power transfer and can achieve very high voltage ratios. Moreover, the converter can alleviate the overvoltage and overcurrent problems when a DC fault happens on either side. Both...
The Phasor Measurement Unit (PMU) is deemed vital to achieving the wide area monitoring and control requirements of the Smart Grid. The devices are capable of capturing time synchronised power system quantities at a very high resolution and accuracy. They are intended to provide key control inputs to both, intra-network High Voltage DC (HVDC) links and potential Thyristor Controlled Series Capacitor...
It will be important for the operation of future multi-terminal HVDC systems that each converter unit is capable of limiting the influence of nearby AC faults on the DC grid. Thus, the local control systems at each terminal should be able to prevent double frequency active power oscillations caused by unbalanced AC faults from propagating to the DC-side of the converter. A simple approach for achieving...
The growing demand on non-fossil fuel energy has escalated the desire for mega-scale renewable energy power generation. This demand can no longer be satisfied by solely relying on onshore renewable energy power plants (i.e. onshore wind farms, PV farms, etc.). Outcomes from a recent project funded by the Sixth European Union Framework Programme (FP6), “Project Upwind” concluded that larger offshore...
National Grid in its capacity as both a Transmission Owner and System Operator is experiencing changes in the network characteristics, brought about by changing patterns in generation, transmission and demand technology. This paper discusses some observations around network performance and shares some thinking on the opportunities and considerations for new technology solutions to contribute to a...
For intermittent power sources like wind and solar, the challenge is to connect and integrate this kind of generation while still meeting the required grid stability and reliability, particularly at a low reserve capacity level. This requires viable solutions of electrical energy storage both for distributed and bulk power applications. UK Power Networks has installed a dynamic energy storage system...
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