Abstract
Owing to increased levels of generation in Scotland, substantial onshore and offshore reinforcements to the Great Britain (GB) transmission network have been proposed. Possible inland reinforcements include the use of series compensation through fixed capacitors. This potentially can lead to subsynchronous resonance (SSR). Offshore reinforcements are proposed by high-voltage direct-current (HVDC) links. In addition to its primary functions of bulk power transmission, a voltage source converter-based HVDC link can be used to provide damping against SSR, and this function has been modelled. Simulation results have been carried out in Power Systems Computer-Aided Design, with system analysis conducted in MATLAB. A real-time hardware-in-the-loop real-time digital simulator-HVDC test rig has been used to implement and validate the proposed damping scheme on an experimental platform. The simulation and experimental results show good agreement.
Highlights
Increased generation in Scotland, in addition to the existing large thermal and nuclear generators that are close to the Anglo-Scottish intertie, has brought operational challenges to the Great Britain (GB) network
The analysis presented focuses on a particular type of subsynchronous resonance (SSR), torsional interactions – described in detail in [4, 5], which is a consequence of the interplay between electrical and mechanical systems
The adverse effects in the form of SSR introduced by series compensation in a three-machine network, resembling the operation of the mainland GB system in the 2020, have been examined
Summary
Increased generation in Scotland, in addition to the existing large thermal and nuclear generators that are close to the Anglo-Scottish intertie, has brought operational challenges to the Great Britain (GB) network. The use of a SSR damper embedded in the VSC-HVDC link controller has been previously examined in the literature [20, 21] It consists of gains, washout filters and lead-lag compensators to appropriately damp troublesome torsional modes. The main contributions of this paper are the validation and implementation of an auxiliary SSR damping loop embedded in the control scheme of a VSC-HVDC link This has been developed on a hardware-in-the-loop real-time experimental platform, which has been assembled to provide a test-bench for dynamic studies of a reinforced GB system. The analytical, simulation and experimentation tools developed here allow the generator and transmission system operators to assess the impacts of series compensation, the SSR phenomenon and the use of the parallel VSC-HVDC link to mitigate it.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
