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Faskompenseringsutredning vid ett pappers och massabruk
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
2015 (Swedish)Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
Abstract [sv]

Sammanfattning

Rapporten innehåller en utredning om, hur och på vilket sätt, det är möjligt att minska det reaktiva effektuttaget vid Metsä Boards fabrik i Husum. Detta är inget problem i normalfallet, men om någon av fabrikens tre turbiner på grund av till exempel service inte är i drift så kan det reaktiva effektuttaget bli för stort enligt avtal med elnätsägaren. Om elnätsägarens gräns överskrids måste en straffavgift betalas per varje överskridet kVAr, vilket Metsä vill undvika. Fokus för arbetet ligger på fabrikens papperbruk eftersom detta är problemområdet.

Efter genomgång av enlinjescheman och olika mätutrustningar som finns belägna i fabriken inses att det är mest lämpligt att kompensera i anslutning till bestrykningsmaskinen (BM1). Bestrykaren är den enda linjen på pappersbruket som inte har faskompenseringsutrustning.

För att hålla sig inom nätägarens gräns beräknades att faskompensering med en kapacitet på 15 MVAr räcker. Den kapaciteten täcker även upp för ett bortfall av den generator som producerar mest reaktiv effekt, generator G1. Men för att undvika eventuella problem med övertoner blir resultatet att en kompenseringsutrustning på totalt 16 MVAr med snedavstämda filter passar anläggningen bättre.

Det finns planer att sätt massabruket i ö-drift och detta blir möjligt med den rekommenderade faskompenseringsutrustningen utan att överskrida den reaktiva effekt gränsen som är satt av nätägaren.   

Abstract [en]

Abstract

This report contains an investigation on, how and in what way, it´s possible to reduce the reactive effect (VAR) consumption at Metsä Board Mill in Husum. The VAR consumption is not a problem during normal operation, but if one of the mill´s three turbines for some reason falls out of operation the VAR consumption may exceed the agreement with the mill´s electricity distributor. If the agreed VAR consumption is exceeded, the mill has to pay a fee for each kVAr that exceeds the agreed consumption level. This is something that the mill wants to avoid because the turbines aren’t always operational due to the need of maintenance work.

The largest VAR consumption is located at the paper mill, which is why the compensation measures are focused in this area. After studying the mill´s single-line diagram of the electrical distribution and different measuring equipment located in the mill, it becomes clear that the VAR compensation equipment is best fitted at the mill´s coating machine. The coating machine is the only production line in the paper mill that is missing VAR compensation equipment, that’s why the compensation measures are needed here.

After calculations it’s clear that the needed VAR compensation capacity is 15 MVAr and should be placed in connection to the coating machine. This capacity is enough to compensate for a loss of the VAR generated from the turbine G1, which is assumed to produce 15 MVAr guaranteed. That compensation is enough to avoid exceeding the VAR consumption agreement with the electricity distributor. But to avoid problems with harmonics, 16 MVAr compensation equipment is recommended instead because it´s more suited for the job.

Metsä has plans to put their pulp mill in insulated operation that separates the mill´s grid from the distribution grid. This becomes possible whit the recommended VAR compensation equipment to avoid over consumption of VAR from the electricity distributor.

Place, publisher, year, edition, pages
2015. , 36 p.
Series
EL, 1522
Keyword [sv]
Faskompensering, reaktiv effekt, kondensatorbatterier, ö-drift
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:umu:diva-105177OAI: oai:DiVA.org:umu-105177DiVA: diva2:823823
External cooperation
Metsä Board AB
Educational program
Högskoleingenjörsprogrammet i Elkraftteknik - nätbaserat
Supervisors
Examiners
Available from: 2015-06-22 Created: 2015-06-18 Last updated: 2015-08-10Bibliographically approved

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  • apa
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