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Power transmission towers in a field at sunset

Mining

Client: Boliden, Sweden

Project: Garpenberg Expansion

Boliden invested SEK 3900 million in a new plant in Garpenberg to increase the mine’s production capacity from the current 1.4 Mt to 2.5 Mt of ore per year. To obtain permission to connect the installation to the feeding grid, it must be ensured that the power factor and harmonic distortion requirements of the electricity supplier will be met.

Harmonizer’s commitment: To design reactive power compensation and harmonic filtering to meet Vattenfall’s power factor and distortion requirements.

As a result of the studies, a 10 kV and a 20 kV filter battery have been installed. Each battery consists of four filter branches tuned to the 5th, 7th, 11th and 13th harmonics switchable in 3 and 2 Mvar steps at 10 kV and 4 and 5 Mvar steps at 20 kV.

The work has consisted of the following steps.

  • Power quality measurements in the existing installation
  • Theoretical calculations of expected reactive power consumption and harmonic generation from the new plant
  • Load flow, harmonic and transient studies for different operating cases.
  • Selection of the appropriate filter configuration to meet reactive power and harmonic distortion requirements.
  • Development of control scheme for reactive power control
  • Preparation of rating data for filters and filter components and development of a detailed technical tender specification.
  • Evaluation of tenders
  • Review and approval of the supplier’s design
  • Control of assembly, commissioning and verification measurements
Filter installation with blue capacitor cabinets and reactors surrounded by pine forest

Principal: LKAB Malmberget, Sweden

Mandate: To reduce voltage variations on 110 kV and 20 kV busbars caused by rapidly varying loads in the form of 4 40-tonne rock winches.

The scope of the work:

  • Real-time measurements of power, current, voltage and harmonic variations.
  • Load flow and harmonic simulations
  • Selection of compensator type and power
  • Evaluation of existing filters
  • Development of technical specification
  • Evaluation of supplier proposals
  • Measurements and verification of performance and rating data after commissioning

Client: LKAB, Sweden

Mission: To analyze the cause and consequences of voltage dips in LKAB’s facilities and propose an action plan to eliminate the problems.

The scope of the work:

  • Compilation and analysis of disturbance registrations at the 130 kV PCC for each LKAB site.
  • Compilation and analysis of fault reports from power suppliers (Vattenfall) and LKAB.
  • Summary of voltage drop related generation interruptions and corresponding loss of income
  • Evaluation of possible measures for 130 kV transmission systems
  • Evaluation of possible measures for distribution systems
  • Evaluation of measures to improve the immunity level of production equipment
  • Calculations of investment costs and payback period for the different measures
  • Final recommendation and action plan

Client: LKAB, Sweden

Mission: To design compensation equipment for a new pellet plant

The scope of the work:

  • Load flow study
  • Harmonic study
  • Selection of the appropriate filter configuration
  • Calculation of rating data for filter components
  • Control of assembly and verifying measurements

Aluminum smelter

Client: ABB Switzerland

  • Final customer: Raz Az Zawr, Saudi Arabia

Mission:

  • To generate 840 MVAR reactive power to improve the power factor at Point of Common Coupling (PCC).
  • To filter harmonic currents generated by the rectifiers to meet the harmonic distortion requirements of IEEE Standard 519.

Scope:

  • Collection of input data for the analytical model
  • Choice of filter configuration
  • Harmonic study
  • Detailed design of filters and filter components
  • Verification measurements
Row of filter equipment with grey and blue components in a fenced station

Client: ABB

Object: Refinery and rolling mill

  • Final customer: Raz Az Zawr, Saudi Arabia

Objective

  • Improving the power factor at the Point of Common Coupling (PCC)
  • To filter harmonic currents generated by frequency converters to meet distortion requirements according to IEEE Standard 519.

Scope:

  • Collection of input data for the analytical model
  • Choice of filter configuration
  • Harmonic study
  • Detailed design of filters and filter components
  • Assembly supervision, commissioning, verification measurements
Filter installation with transformers and capacitors behind a fence next to an industrial building

Client: ABB

  • Final customer: ISAAL Iceland

Scope: Design of harmonic filters for expansion projects. Total power generated 85 Mvar

The scope of the work:

  • Harmonics measurements to determine existing harmonics
  • Harmonic study
  • Transient study
  • Selection of appropriate filter configuration to meet power factor and harmonic distortion requirements
  • Calculation of rating data for filter components
  • Control of assembly, commissioning and verification measurements

Client: ABB

  • Final customer: Sohar Oman

Scope: Design of harmonic filters for expansion projects. Total power generated 220 Mvar

The scope of the work:

  • Harmonic study
  • Transient study
  • Selection of appropriate filter configuration to meet power factor and harmonic distortion requirements
  • Calculation of rating data for filter components

Client: ABB

  • End customer: Nordural Island

Scope: Design of harmonic filters for expansion projects. Reconstruction of the 3rd harmonic filter.

The scope of the work:

  • Harmonics measurements to map existing harmonics
  • Harmonic study
  • Transient study
  • Selection of appropriate filter configuration to meet power factor and harmonic distortion requirements
  • Calculation of rating data for filter components
  • Commissioning
  • Verification measurements

Client: ABB

  • End customer: Quatalum, Qatar

Scope: Design of harmonic filters for a new aluminum smelter. Total generating power 650 Mvar.

The scope of the work:

  • Harmonic study
  • Transient study
  • Selection of appropriate filter configuration to meet power factor and harmonic distortion requirements
  • Calculation of rating data for filter components

Distribution and transmission applications

Client: Orkuvirki, Iceland

Application: Compensation of a 130 kV substation.

Mission: To design 3 x 20 Mvar, 130 kV harmonic filters.

The scope of the work:

  • Harmonics measurements on 130 kV busbars to map existing harmonics
  • Harmonic study
  • Transient study
  • Selection of appropriate filter configuration to meet harmonic distortion requirements
  • Calculation of rating data for filter components
  • Selection of the protection scheme and protection settings
  • Control of assembly, commissioning and verification measurements

Client: ABB

Application: Reactive power compensation of three 110 kV substations.

  • End customer: PGC, Poland

Task: To design 3 x 50 Mvar, 110 kV harmonic filters in three different substations.

The scope of the work:

  • Harmonics measurements on 110 kV and 400 kV busbars to map existing harmonics
  • Harmonic study
  • Transient study
  • Selection of appropriate filter configuration to meet harmonic distortion requirements
  • Calculation of rating data for filter components
  • Selection of the protection scheme and protection settings
  • Control of assembly, commissioning and verification measurements

Client: ABB

Application: 400 kV, 220 kV, 110 kV, 63 kV compensation projects in different locations in France.

  • End customer: RTE, France

The scope of the work:

  • Harmonic analysis
  • Transient study
  • Calculation of rating data for filter components
  • Selection of the protection scheme and protection settings
  • Control of assembly, commissioning and verification measurements

Wind farms

Client: Siemens Sweden

Object: Storrotsliden Windfarm, Sweden

Mission: To find the cause of frequent equipment breakdowns and insulation failures.

Scope of work:

  • Power quality measurements
  • EMTP modeling and transient simulations
  • Diagnostics and remedies

Problem solving

Customer: Nordural, Iceland

Problem: Measuring transformer and cable failure

Nordural experienced frequent failures of voltage transformers and unauthorized tripping of a 33 kV generation line resulting in material damage and loss of production. Examination of the measurement data from the disturbance analyzer indicated that the problems were caused by ferroresonance.

Harmonizer has carried out a system study consisting of on-site measurements and computer-based simulations. As a result of the study, specially designed ZnO-R-C damping circuit has been proposed and installed.

The scope of the work:

  • EMTP Simulations
  • Design of the damping circuit
  • Procurement of components
  • Commissioning
  • Verification measurements.
Close-up of disconnectors with insulators and a filter resistor in a switchgear room

Publications

Specialized in power quality

We help our customers to achieve electromagnetic compatibility in the electricity network and thus avoid troublesome and costly disruptions.

Contact us
+46 70 783 88 89 natan.gothelf@harmonizer.nu