Dynamic Load Modelling Authors Name Murali Venkata 1276

Dynamic Load Modelling Author’s Name Murali Venkata 1276 2873 Supervisor Dr. Qi Su Associate supervisor Prof. Bob Morrison What is a LOAD, a LOAD MODEL & TYPES of LOAD MODELS? Load can have several meanings in a power system including: • A device that consumes power • Total power (active and/or reactive) consumed by all devices • Power output of generating plant • A portion of system that is not explicitly represented in a system model, but rather treated as a single powerconsuming device connected to a bus. A load model is a mathematical representation of relationship between a bus voltage (magnitude and frequency) and the power (active and reactive) or current flowing into the busload. Load models are classified into two broad categories: static and dynamic models. Why ? · Any accurate description of a power system phenomenon in time-domain requires dynamic load representation · Any load parameters depending on the past instants of time also require dynamic modelling. The following studies prefer dynamic load modelling: First swing stability, Small signal (damping and synchronising power) stability, Induction motor stability, Voltage stability & Dynamic over-voltages How? Current practices: Measurement based approach & Component based approach. Need for research: the needs for using extensive non-linear mathematical tools for large-signal load modelling & the errors which may be introduced if it is linearized. the component-based and measurement-based methods to be used in complimentary or a supplementary manner ? · Introduce models and data for load behaviour for low voltages and over long time periods, incorporating self-tripping & auto-control mechanisms during low voltage and under-frequency conditions for ex, low voltage stall, trip and recovery behaviour. · Methods for measuring load characteristics. Electrical and Computer Systems Engineering Postgraduate Student Research Forum 2001