UK transmission system modelling and validation for dynamic studies

Due to environmental concerns, renewable energy and carbon emission reduction targets are established. The National Grid developed scenarios which are likely to change the patterns of UK transmission network operation and dynamic performance. Therefore, it is necessary to develop an analytical capability which can assess the system dynamic performance ahead of the anticipated changes. Although some work has been reported in this area, the studies are either based on very simple network representations or involve very complex proprietary network modelling not publically available and with results which are often difficult to interpret. This paper describes a method of establishing and validating an equivalent model of a large power system. A representative 21 bus dynamic model of the entire UK transmission system based on Seven Year Statement has been developed and implemented in Power System Simulator (PSS@E). A methodology is proposed to systematically derive the parameters of the equivalent network. A few recent system-wide events, captured by the existing Phasor Measurement Units (PMU), have been used to validate the frequency response of the model.