An ANN-Based Power System Emergency Control Scheme in the Presence of High Wind Power Penetration
Re-evaluation of emergency control and protection schemes for distribution and transmission networks are one of the main problems posed by wind turbines in power systems. Change of operational conditions and dynamic characteristics influence the requirements to control and protection parameters.
Introducing a significant wind power into power systems leads to new undesirable oscillations. The local and inter-modal oscillations during large disturbances can cause frequency and voltage relays to measure a quantity at a location that is different to the actual underlying system voltage and frequency gradient. From an operational point of view, this issue is important for those networks that use the protective voltage and frequency relays to re-evaluate their tuning strategies.
In this chapter, an overview of the key issues in the use of high wind power penetration in power system emergency control is presented. The impact of wind power fluctuation on system frequency, voltage and frequency gradient is analyzed, the need for the revising of tuning strategies for frequency protective relays, automatic under-frequency load shedding (UFLS) and under-voltage load shed-ding (UFLS) relays are also emphasized.
In the present chapter, necessity of considering both system frequency and voltage indices to design an effective power system emergency control plan is shown. Then, an intelligent artificial neural network (ANN) based emergency control scheme considering the dynamic impacts of wind turbines is proposed. In the developed algorithm, following an event, the related contingency is determined by an appropriate ANN using the online measured tie-line powers. A suitable set of voltage sensitivity indices based on a comprehensive voltage stability analysis in the presence of the wind turbines is proposed. Another intelligent ANN is used to examine the stability margin by estimating the system power-voltage (P-V) curves. Finally, the system frequency gradient, voltage sensitivity indices and stability information are properly used by an effective load shedding algorithm. The proposed emergency control scheme and discussions are supplemented by computer nonlinear simulations on the IEEE 9-bus test system.
KeywordsPower System Wind Turbine Reactive Power Stability Margin Emergency Control
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