Development of a LCC HVDC Model in Siemens PSS/E Format

A robust and flexible LCC HVDC model is developed in Siemens PSS/E format for the analyses of the HVDC connecting power systems of Colombia and Panama (both operating at 60Hz), which will be the only interconnection between the electrical grids of these systems.

The HVDC will be developed as a Bi-pole HVDC LCC ±300kV with dedicated metallic return, with total power of 400MW (200MW per pole). The connection in Colombia is at 500kV AC with external capacitive compensation via fixed banks of 200MVAr capacitive (2x100MVAr). The connection in Panama at 230kV AC with external capacitive compensation via fixed banks of 200MVAr capacitive (2x100MVAr).

The PSS/E model is equipped with VDCOL (Voltage Dependent Current Order Limit) control to perform steady-state and transient stability simulations. The over voltage protection at both ends is set up (when a pole is lost, the external capacitive compensation will be disconnected). The frequency control at Panama converter station is set up by additional frequency sensitive auxiliary signal model with adjustable frequency droop setting. Each of model functionalities is verified by specific simulation.

Report contains detailed description of the HVDC components, theoretical background of the HVDC performance in normal operation and operation during transients, detailed description of both steady-state and dynamic model parameters.

Type of services provided:

• Development of steady-state and dynamic LCC HVDC models
• HVDC overvoltage protection
• Frequency sensitive auxiliary signal model