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Shunt & Series Compensation

66kV and 11kV Shunt Capacitor Bank Installations

Zambia

Client:

Copperbelt Energy Corporation (CEC)
PSD sub-contracted by High Voltage Technologies (HVT)
(HVT - Main Contractor)

Project Status: Ongoing

Zambia Shunt Capacitor Bank Installation Project Outline
CEC plans to install six 66kV and ten 11kV shunt capacitor banks in their power grid. The capacitors are required for voltage support purposes. PSD performed the electrical studies and analysis for the design and specification of the shunt capacitor banks.

Services to Client

•	On-site back-ground harmonic measurements and analysis of the results
•	Steady-state capacitor switching study
•	Capacitor harmonic integration and transient switching studies
•	Capacitor bank design
•	Functional specification

Project Detail
The study included:

•	On-site measurements were conducted to assess the level of present-day back-ground harmonics. The results were analysed, compared with NRS-048 limits, and compiled in report format.
•	The study required extensive electrical data collection and a model of the complete CEC and connecting utility grids were built up using DigSilent simulation software.
•	As a first step, a load flow study was done to determine the expected steady-state voltage variations as a result of switching the proposed capacitor banks. This was done to confirm that the individual sizes of the capacitor banks were adequate for successful operation within the CEC power grid, i.e. that the voltage variations as a result of capacitor bank switching were within stated limits.
•	Next, a capacitor bank harmonic integration study was done to determine if these banks should be plain capacitors or filter banks. This involved extensive harmonic frequency scans under various system operating conditions and analysis of the existing harmonic levels, harmonic impedances and amplification. In addition transient switching studies were also performed.
•	Based on the results of the harmonic integration studies and analysis filter bank configurations were recommended and design parameters calculated.
•	Finally, functional specifications for the proposed filter capacitor banks were drafted.

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