Load Share is trialling an innovative power electronics technology to release additional capacity on the network by equalising the impedance between two substations to balance the power flow. If successful it will unlock additional capacity on the existing network without the need of re-conducting.
The power flow on the Bramford GSP to Lawford Grid 132kV overhead PJ circuit is expected to exceed its rating during normal and abnormal running conditions. This problem will occur with the already accepted and connected generation on these circuits. It is not possible to lower demand or generation power exchange between the 132kV substations without compromising operational and planning requirements. Additional load is anticipated to be connected in the area in the next eight years.
Accommodating large number of generation within contraint areas will require network re-enforcement and is generally very expensive.
This project will trial two newly developed technologies from SmartWires called “Power Guardian” and “Power Line Guardian” to share the load between two circuits i.e transfer the load from overloading circuit to the underutilised circuit to balance. This is an innovative approach of accommodating more renewable generation without the need for time-consuming or costly network reinforcements.
The two devices developed by Smart Wire (Power Guardian and Power line Guardian) are newly developed innovative solutions that consists of modules that can be wrapped around an existing conductor and enables the dynamic switching of small individual series blocks of impedance to control the flow of power through a particular circuit in real time. Power Guardian is ground mounted on post insulators and are ~450milli ohms per unit, whereas Power Line Guardian can be affixed to the overhead line conductor.
Curtailment studies show 1.8 ohms is required on PJ route to balance the circuit total impedance and MVA flows, which will solve our challenge of overloading and will also release extra capacity to open the circuit for more generation on the network. A number of different options were considered to add 1.8 ohms required on the PJ route but the quickest and cheapest solution identified is the installation of Smart Wire devices in combination.
The two devices developed by Smart Wire (Power Guardian and Powerline Guardian) are a new innovative solution that consists of modules that can be wrapped around an existing conductor and enables the dynamic switching of small individual series blocks of impedance to control the flow of power through a particular circuit. Power Guardian and PowerLine Guardian have never been trialled within GB DNOs.
This project will demonstrate the possibility of releasing network capacity and installing an extra 110 MW of embedded generation, subject to certain conditions. It offers a reasonably fast minimum cost solution and the trial of an active network and enables a safe phased approach, involving initial installation and trials, before installing extra generation.