Abstract
This paper describes a method to estimate conservation voltage reduction (CVR) factors using data measured in power distribution systems. A direct method is proposed to estimate CVR factors using only data measured at the moment of the transformer tap change. The mean absolute deviation (MAD) direct method is proposed to consider direct methods and load variations. The proposed methods do not necessitate intentional tap changes for testing purposes. Instead, the voltage and load changes that occur when the tap changes, for voltage regulation purposes, are measured and utilized in the CVR factor calculation. The proposed methods were tested using data obtained from the Korea Electric Power Corporation (KEPCO) system, and the results revealed that CVR factors for both active power and reactive power could be estimated using data measured in power distribution systems. Results of the CVR factor estimation for the active power revealed that the highest CVR factors occurred in winter, during which a large quantity of heating loads exist. In addition, the estimated CVR factors for the reactive power were higher than the estimated CVR factors for the active power because reactive power is more sensitive to voltage changes.
Highlights
To support the sustainable growth of humanity, new technologies are being developed to solve real world problems such as energy depletion and environmental pollution
Voltage reduction methods are classified into three types: conservation voltage reduction (CVR), emergency voltage reduction (EVR), and routine voltage reduction (RVR) [6]
This paper introduces and describes a method to estimate CVR factors using measurement data from power distribution systems and presents the results of applying this method to the Korea Electric Power Corporation (KEPCO)
Summary
To support the sustainable growth of humanity, new technologies are being developed to solve real world problems such as energy depletion and environmental pollution. Power companies have the tendency to operate their systems at peak load because of the electric energy shortage, and voltage reduction is performed to reduce the load demand at this peak [3,4,5]. The results from analyzing the energy saving and voltage reduction effects in the KEPCO system using the Substation Operating Results Management System (SOMAS) data are described in the study by Nam et al [15]. This paper introduces and describes a method to estimate CVR factors using measurement data from power distribution systems and presents the results of applying this method to the KEPCO system.
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