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Analysis of Inverter Side Voltage Issues in HVDC Transmission Systems

HVDC transmission systems are becoming more attractive for long distance transmission. HVDC transmission can be an alternative to solve many power quality issues associated with HVAC transmission systems. Voltage Source Converter (VSC) based HVDC system are better choice over thyristor-based converter systems. VSC based system addresses many issues in Current Controlled Converter (CSC) based HVDC system. With proper coordination and control of VCSs many power quality issues can be addressed. Due to increasing load demand, there will be voltage sag near the receiving terminal. A control scheme for voltage source converter based HVDC system to mitigate voltage sag issues in the receiving node are presented in this paper. The controller based on P-Q theory is adapted and the voltage sag is alleviated with the proposed control.