The Commitment of Interruptible Load to Ensure Adequate System Primary Frequency Response


The employment of interruptible load (IL) resources to enhance the first frequency response (PFR) of an interconnected power system has been proposed and, for speed, it is probably that such resources would operate autonomously on local frequency measurements. The commitment of the resources, however, might be coordinated globally and regularly in accordance with the state of the system. This paper investigates the minimum cost commitment of IL resources to ensure the PFR of a system remains inside specified limits. The binary integer programming drawback considers the commitment cost of each IL resource and includes nonlinear frequency constraints specified by the transient stability simulation of the system. A methodology to estimate the contribution of an IL resource towards meeting a frequency constraint is proposed and incorporated into a solution approach that involves the iterative solving of a linear commitment drawback. The sensitivity-based estimation technique reduces the number of computationally burdensome transient stability simulation required by the algorithm with very little increase in the final resolution value. An IEEE 118-bus test case study with a thousand IL resources demonstrates the good thing about the estimation methodology.

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