Power Consumption Analysis of Electrical Installations at Healthcare Facility

Abstract

This paper presents a methodology for power consumption estimation considering harmonic and interharmonic content and then it is compared to the power consumption estimation commonly done by commercial equipment based on the fundamental frequency, and how they can underestimate the power consumption considering power quality disturbances (PQD). For this purpose, data of electrical activity at the electrical distribution boards in a healthcare facility is acquired for a long time period with proprietary equipment. An analysis in the acquired current and voltage signals is done, in order to compare the power consumption centered in the fundamental frequency with the generalized definition of power consumption. The results obtained from the comparison in the power consumption estimation show differences between 4% and 10% of underestimated power consumption. Thus, it is demonstrated that the presence of harmonic and interharmonic content provokes a significant underestimation of power consumption using only the power consumption centered at the fundamental frequency.

Electrical Consumption Profile Clusterization: Spanish Castilla y León Regional Health Services Building Stock as a Case Study

“…n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a HCE −6. 23 Finally, Figure 8 shows the geographical distribution of the classified buildings. It is hard to identify a spatial pattern in this case, but it may be observed that class 4 buildings are located mainly in the borders (rural and mountainous areas).…”

“…So, the analysis of power consumption in buildings is becoming much more relevant today than in the past, when it was several orders lower than thermal demand. Moreover, monitoring can provide advanced visualization and data analysis tools to achieve energy savings and peak power optimization [22,23].…”

Improved Operation Strategy with Alternative Control Targets for Voltage Source Converter under Harmonically Distorted Grid Considering Inter-Harmonics

“…Reference of output voltage consists of the output of fundamental control loop, output of supplementary control loop and the decoupling component [21,22], thus the voltage reference of VSC can be described as:…”

“…The inter-harmonics voltage can be caused by variable frequency device (VFD) or adjustable speed device (ASD), HVDC and time-varying loads [19,20]. Also, the high frequency resonance (HFR) [21,22] caused by the interconnected system consisting of the grid-connected device and parallel-compensated grid can generate the inter-harmonic voltage at PCC. According to the recommendation from IEEE, the individual inter-harmonics of voltage distortion can be no more than 1% to 5% in different voltage levels [17,19].…”

An Innovative Calibration Scheme for Interharmonic Analyzers in Power Systems under Asynchronous Sampling

“…According to the definition, interharmonic frequency refers to any frequency which is not a multiple of the fundamental frequency of a power supply or a frequency converter. Interharmonics attracted much attention in the past few years [3,4]. In particular, electrical engineers who study current and voltage waveform distortion in power systems are interested in interharmonics [5,6].…”