Monitoring of dips in the MV network for regulation- A case study

Papathanasiou²,

Ćuk³

et al. 2024

RE&PQJ

Self Cite

Voltage dip is considered as the PQ problem related to the highest financial losses for the customers. It occurs unpredictably mainly due to short-circuit faults in the networks. Network operators and customers want to know more about the occurrence and the potential impact of voltage dips. PQ monitoring is an essential tool for the assessment of voltage dips and it can ultimately contribute to the regulation of voltage dip events. In this paper, firstly the methods of voltage monitoring and voltage dips characterization are discussed. Voltage dip indices of six substations are presented in order to assess the occurrence, type and severity of dips that occur in typical Dutch MV networks. Finally, an approach, which is based on the disrupted loads because of a voltage dip event, is introduced and applied to the data at one substation in order to assess the quality of supply voltage and its implications for the end-users. Index Terms-assessment of voltage dips, dip monitoring, reporting dips, transfer of dips, voltages dip indices

Section: A Monitoring Of Voltage Dipsmentioning

confidence: 99%

Assessment of Voltage Dips based on Field Measurements in MV Networks

Papathanasiou²,

Ćuk³

et al. 2024

RE&PQJ

Self Cite

“…Since then, PQ monitors have been introduced in the MV networks, and even more monitors are installed during 2014 to 2015 for continuous voltage dips measurements in the MV networks. As also recommended in the CIGRE/CIRED guidelines, permanent PQ measurements are mostly done on the MV side of the transformer in the HV/MV substations, which is considered as the most optimal monitoring location …”

Section: Important Aspects For Building Voltage Dip Regulationmentioning

confidence: 99%

“…As also recommended in the CIGRE/CIRED guidelines, permanent PQ measurements are mostly done on the MV side of the transformer in the HV/MV substations, which is considered as the most optimal monitoring location. 30 Voltage events (voltage waveforms with high time resolution) collected from 53 monitoring locations over different years of measurement period are used in this work. With this monitored data, phase-to-ground voltages are recorded in the MV networks.…”

Section: Monitoring Voltage Eventsmentioning

confidence: 99%

A proposal on voltage dip regulation for the Dutch MV distribution networks

Int Trans Electr Energ Syst

Ćuk

Cobben

2018

Summary Voltage quality regulation has been an ongoing discussion in many countries in the world to set up a regulatory framework where also voltage dips are included in the national grid codes. Regarding voltage dips, the regulatory framework is useful for establishing the coordination between the network operators, the equipment manufacturers, and the customers. The voltage dip regulation can provide benefits for the involved parties. By defining the responsibilities for the network operators and the customers, it can help distribution system operators to evaluate the quality of supply voltage and to take possible measures when the number of dips exceed the reference values defined in the regulation. The regulatory framework can also help customers to make an economic analysis for choosing appropriate mitigation methods to reduce the expected economic damages caused by voltage dips. This article presents two approaches for classifying different types of voltage dips into various clusters. Using datasets of voltage dips from the Dutch MV networks, the paper also describes the methodology for setting limits on the number of voltage dips for the regulatory purpose.

“…Because of economic constraint, the number of monitors installed in the MV distribution networks is restricted and this makes difficult to pinpoint the exact event location. From the data of a monitoring system in the MV distribution network, placed at the optimal location [8], voltage dip parameters including magnitude, duration and type can be obtained by diagnosing and characterizing the instantaneous values of voltage waveforms of the data [9], [10]. The data may include dips originating from the HV-or MV-networks which may be caused by short-circuit faults, energizing of transformers or switching of heavy loads.…”

Section: Introductionmentioning

confidence: 99%

Determining the Source of Dips Using Data of One Monitor in the MV Network

Ćuk

Cobben

2024

RE&PQJ

Self Cite

Abstract--This work discusses about a method that could be used to determine the source of voltage dips based on voltage and power measurements from a single monitor in the MV distribution network. The method uses information of activepowers of each feeder connected to the primary substation measured before, during and after the dip events. The ratios of during-dip and post-dip powers to the pre-dip power are used to distinguish the origin and cause of the disturbance. As a power quality problem related to the highest financial losses for industrial customers, knowing the origin and cause of voltage dips is very important in order to identify the weakest part(s) of the network and to take corrective measures that improve the power quality levels and reduce the potential impact of dips to customers.Index Terms--monitoring system, MV-network, voltage dip, voltage dip cause, voltage dip origin.