Modelling of the HTA/BT electric network

PHASE 1

Distribution network:

• Analysis of the modification of the topology of equipment in place (HTA condensator batteries)
• Study of the influence of harmonic currents and losses dissipated by the network’s various components, synchronous machines, condensators etc.

The analysis shows resonance phenomena associated with the historical implantation of HTA condensator batteries, their nominal power and the harmonic currents generated by all the electronic speed drives installed on the site. This finding requires a second phase of measurements on the BT networks.

Co-generation project:

• Analysis and influence of harmonic current flows on the project
• Analysis of the optimal reactive energy compensation to be implemented on the HTA network

Co-generation comprises a steam power turbine and a synchronous machine. The production performances on the HTA electrical network depend on the quality of the harmonic flow current circulating around the network. Harmonic currents impair the machine’s performance level up to 10 %.The aim of these evaluations is to connect the co-generation unit to a “healthy” electrical network.

PHASE 2

• Analysis of the various scenarios on the evolution of the network
• Monitoring of the distortion levels in the electrical network harmonics (THD-U and THD-I)
  • Condition of line charges and transformers
  • Establish traceability of the current quality
  • Client support on its future investments
    • Integration of future projects
    • Study of functional limits on the network in the presence of new charge

The aim is to stimulate various operational scenarios to anticipate any malfunction (constraints at injection point, resonance, decommissioning of the machine, current stability) and the impact of synchronous machine transitory phases (current dips, phase asymmetry).

The analysis has allowed the technical specifications of the active filters and reactive energy compensation batteries to be determined and put in place onsite.