Abstract
This work reviews and analyzes the feasibility of frequency support by Demand Response (DR). The unbalance between power generation and load demand would cause a serious frequency stability problem. DR is an effective method to provide grid frequency support since it can reduce peak load in advance or shed load immediately when a contingency occurs. This work first introduces the general concept and classification of DR programs, then focuses on the detail concept of Direct Load Control (DLC) and Emergency Demand Response (EDR) programs; they are suitable for providing grid frequency support. In addition, this work reviews and analyzes the cost of implementing DLC and EDR for frequency support, including the international experience of DLC implemented in California and EDR implemented in New York.
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