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Ireland and Northern Ireland have policy objectives to have 40% of total electricity consumption to be provided by renewable sources by 2020. Approximately 37% of the total energy will be supplied by windfarms. As a separate synchronous power system, the operational challenges to achieving this securely and effectively are significant. In particular, it has not yet been established to what level a...
This work investigates the impact of increased penetration of doubly fed induction generators (DFIGs) on electromechanical modes of oscillations of a large interconnected power system. The work proposes a control mechanism aimed at designing the power system stabilizer (PSS) for a DFIG similar to the PSS of synchronous machines. The wind generator power output is taken as input to the PSS. The active...
This paper details the investigation of a large frequency excursion of 2.28 Hz, experienced in the New Zealand power system on 1st August 2009 when the HVDC interconnector tripped, resulting in a power deficiency in South Island power system. A major portion of the spinning reserve to cover for this contingent event was provided by generating units operated in Tail Water Depressed (TWD) mode which...
New control systems for Variable Speed Wind Turbines (VSWT) need to be developed in order to provide inertia response and frequency control to support the grid. This work studies the behavior and capability of VSWT for providing temporary active power overproduction. The study is conducted on a multi-megawatt VSWT with Doubly-Fed Induction Generator. It was found that it is possible to have an active...
Multivariate general predictive control (MGPC) has a good application in the control of plant with inertia and delay. But it has some defects such as great amount of computation online and poor treatment of constraints. This paper introduces Hopfield neural network into MGPC. Firstly, the MGPC was decomposed into several multi-input and single-output systems, then it was converted to several quadratic...
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