L R AS Published on Sunday 28 February 2021 - n° 352 - Categories:the American PV
Three technologies could improve the American network
According to a study by the Brattle Group, three technologies for improving the American network could stimulate the use of any existing transmission system. All that would be required would be the introduction of advanced power flow control,
optimisation of the topology and dynamic notation of the lines. Thus in two States (Kansas and Oklahoma), these technologies could enable the network to accommodate 140 MW of solar power by 2025 against 100 MW without them.
Out of the 9.17 GW of wind projects in these two states that have also signed an agreement, the network could accommodate 5.1 GW with the transmission technologies, about twice as much as the 2.5 GW possible without them.
Advanced energy flow control: technology redirects energy from overloaded lines to under-utilised parts of a transmission network. It requires the use of equipment with advanced features such as the ability to be quickly deployed, easily scaled or redeployed as needed.
Topology optimisation can achieve the same results as advanced flow control devices, according to the Brattle study, but using existing equipment. The optimisation technique uses software to identify the transmission line circuit breakers that need to be opened or closed to route the energy flow around the congested elements.
Dynamic line rating: the maximum capacity for power flow on a transmission line is limited by heating considerations. In general, conservative assumptions about the operating environment of the line are used, but do not take into account factors such as wind chill, which allows for greater use of the transmission. Dynamic line evaluation determines the thermal evaluation of transmission lines using enhanced or real-time data to assist system operators in determining the current transmission capacity limits of transmission lines.
PV Magazine of 25 February