Improved sensitivities in MW dispatch for control of voltage

Abstract

This paper describes the derivation of linear sensitivities used in the dispatch of MW controls for alleviation of voltage violations. Such a set of sensitivities is important for the selection and coordination of necessary changes to MW generation, phase shifter settings and, as a last resort, load shedding where reactive power controls are insufficient. The sensitivity analysis has been embedded in a qualitative reasoning based decision support tool in which operators' considerations such as cost, control effectiveness, preservation of control margin and ease of implementation are modeled in such a way that priorities can be adjusted and results achieved quickly. Results are presented demonstrating the accuracy and effectiveness of the proposed approach both for a standard test system and a system representing a real network.

Decision Trees Applied to the Management of Voltage Constraints in the Spanish Market

“…Voltage constraints are solved by connecting a set of offline generators, and reducing an equal amount of power in the most expensive connected ones. The new connected generators provide reactive support in the importing areas and also inject active power in the system, which reduces the power transfers between exporting and importing areas (the effect of injecting active power to increase the voltage profile is significant when a power system is close to the critical loading condition of the nose curve [7], [8]). This type of constraints has a local effect: they can only be solved by the connection of generators located in the importing areas where they occur.…”

Dynamic Voltage Stability Improvement using coordinated control of dynamic VAR-sources

“…This is done by determining the sensitivity of load bus voltages to reactive injections of sources [13,14] and accordingly dividing the task of reactive support. The organization of this paper is as follows.…”

Identification of DG Location through Sensitivity Factors under Line Outage Condition

“…The interdependence between system variable can be quantitatively determined by what is known as sensitivity analysis. Sensitivity is defined as the ratio of small change of some dependent variable to the small change of the concerned independent variable [2]. In the operation of power system sensitivity analysis is of great importance since it helps in the visualization of the cause and effect relationship between the variables and as such is the basics of many control scheme of the power system.…”