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SUMMARYFast growth of large-scale distributed renewable energy resources, electric power markets, and responsive demand impose significant amount of correlated uncertainties on operation of the power system from both resource side and load side. Understanding the correlations between these uncertainties and applying sophisticated correlation analysis of multiple dependent uncertainties is a defining issue for the development of methodologies and technologies for power system operation in the new era.Application of correlation analysis in operation of the power system is not as fully explored as many other methodologies. The complexity of mathematic modeling of multiple correlated random variables challenges the power system professionals. The research is further challenged by lacking of operational experience and empirical investigation challenges.This paper provides a bibliography survey on application of correlation analysis in operation of the power system. The scope of the review covers IEEE power systems proceedings, IEEE and IEE transactions published after 1980. There are 77 relevant papers identified. These papers are put into seven technical categories: power system reliability, wind generation, power market analysis, load forecast, resource planning and dispatch, transmission load flow, other non-operation-related topics.

This paper describes an analytical approach for the operation of series compensators to relieve power flow congestion. The flexible AC Transmission Systems (FACTS) devices such as thyristor-controlled series capacitor (TCSC) and static synchronous series compensator (SSSC) can control power flow in the line by varying reactive line impedances. In the case of congestion problem at normal state or at contingency state, it is necessary for these devices to change their operating points to relieve the line flow congestion and eventually to increase the system security level. In order to find the approximate operating points, the changes in line flows for changes in control variables by series compensators are derived analytically in this paper. The derivation of these sensitivity factors is based on the DC model of power flow analysis and under the assumption that the generation dispatch is maintained. Changes in the direction and the amount of compensation can be determined according to sensitivity Values derived from DC power flow model. For verijkation of the proposed method, intensive studies have been pegormed on a 10-unit 39-bus New England System equipped with multiple series compensators.

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