A Case Study on Power Quality in a Virtual Power Plant: Long Term Assessment and Global Index Application

Abstract

The concept of virtual power plants (VPP) was introduced over 20 years ago but is still actively researched. The majority of research now focuses on analyzing case studies of such installations. In this article, the investigation is based on a VPP in Poland, which contains hydropower plants (HPP) and energy storage systems (ESS). For specific analysis, the power quality (PQ) issues were selected. The used data contain 26 weeks of multipoint, synchronic measurements of power quality levels in four related points. The investigation is concerned with the application of a global index to a single-point assessment as well as an area-related assessment approach. Moreover, the problem of flagged data is discussed. Finally, the assessment of VPP’s impact on PQ level is conducted.

A Case Study on Data Mining Application in a Virtual Power Plant: Cluster Analysis of Power Quality Measurements

“…Thus, in point of PQ assessment, there is an analysis of 26,208 single 10 min data points. However, for such a long period of multipoint measurements, the coverage of data is equal to 97.7%, thus 25,069 data points were used [71]. Also, as a preprocessing of PQ data, the data that come from the time when a voltage event occurred were excluded, as suggested in Reference [62].…”

A Case Study on a Hierarchical Clustering Application in a Virtual Power Plant: Detection of Specific Working Conditions from Power Quality Data

“…Thus, these data represent long term data during which different working conditions may occur. This dataset, in work [24], was used to compare the working conditions that were defined a-priory. The states were connected with HPP and ESS working condition, and level of active power.…”

“…The network fed from the 110/20 kV station is an overhead cable network. The selected network has earth fault current compensation [24]. The main distributed energy resources that are integrated into the virtual power plant are a 1.25 MW HPP and a 0.5 MW battery ESS.…”

“…The selected network has earth fault current compensation. [24] The main distributed energy resources that are integrated into the virtual power plant are a 1.25 MW HPP and a 0.5 MW battery ESS. Both are connected to a medium voltage level.…”

“…However, the coverage of data point is equal to 97.7% due to measurement device problems. Thus 25,069 10-min data points were accessible [24]. However, as a preprocessing of PQ data, the voltage events connecting data were also excluded as suggested in [36].…”