Computation of Required Reactive Power Support of WPP in Systems with High Wind Generation

What is it about?

The availability assessment of a power system is generally used to evaluate the probability of supply power at a given load point adequately. The traditional nodal loss of load probability (LOLP) and the expected energy non-supplied (EENS) are used in previous works [10]-[12]. However, unlike AC systems, an HVDC grid has the function of injecting or extracting power from an AC interconnection zone, which implies that traditionally used nodal reliability indices must be modified to indices that reflect the performance of the HVDC network to fulfil its function of interconnection of systems. The availability assessment of an HVDC grid must evaluate its ability to supply power to AC zones that import energy; at the same time, it must evaluate the ability to transport the power from AC zones that export energy. In consequence, a new set of indices to measure these two functions must be proposed, as it is made in this paper.

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Why is it important?

With wind power massive penetration there has been changes in the operational characteristics of the power systems mainly because wind power generation technologies are different from conventional ones. Also, it is impossible to accurately predict wind generation at any given time. According to this, increased levels of wind generation introduce new risks and challenges for the power systems. Consequently, reactive power and voltage control are considered those big challenges when generating and transmitting the produced energy from wind power plants (WPP). Also, voltage stability issues can occur with the large-scale wind farms integration mainly because of the stationary voltage variations and the consumption of all the reactive power reserves in the system due to wind power injection.