"Analysis of Mixed Inverter/Rectifier Multi-Infeed HVDC Systems"

Xiuyu Chen (Visiting Scholar)
Supervisor: Dr. Aniruddha Gole

Aim of Project

1. Find the proper index to quantify the AC strength to the DC line in the mixed inverter/rectifier multi-Infeed HVDC system.
2. Investigate the impact of the voltage interaction between rectifier and inverter on the Commutation Failure (CF) and Transient Overvoltage (TOV) characteristics of the MI system.

Description of Project

In pure inverter multi-infeed HVDC systems, an index referred to as the multi-infeed short circuit ratio (MIESCR) has been proposed, which quantifies the maximum available power (MAP) and the power/voltage stability limit. However, the index in its proposed form is not directly applicable in mixed inverter/rectifier multi-infeed HVDC systems. A new modified form of the index is introduced, making the index applicable in the two type multi-infeed HVDC systems.

Commutation Failure (CF) and Transient Overvoltage (TOV) in mixed inverter/rectifier multi-infeed HVDC systems with different ac strengths and levels of voltage interaction are also studied in this research. The results reveal that electrical proximity of a rectifier station improves the inverter station performance, making its behaviour similar to that of a station connected into a stronger ac network. TOV and CF susceptibility are reduced.

Accepted/Published Papers

1. Xiuyu Chen, A. M. Gole, Minxiao Han. Study on Multi-Infeed HVDC System With Rectifier and Inverter Connected. IEEE Transaction on Power Systems FULL TEXT

2. Xiuyu Chen, Minxiao Han, Chongru Liu, A. M. Gole. Evaluation on the strength of the Multi-Infeed HVDC System with Rectifier Stations Connected. Accepted by Proceedings of the CSEE.

3. Xiuyu Chen, Minxiao Han, Chongru Liu, A. M. Gole. Impact of the Control Mode on the Interaction in the Multi-infeed HVDC system. Accepted by Automation of Electric Power Systems.

4. Xiuyu Chen, A. M. Gole, Minxiao Han, Chongru Liu. Influence of the MIIF Index on Operation of Multi-infeed HVDC Systems. Accepted by 2011 IEEE Electrical Power and Energy Conference.

5. Xiuyu Chen, A. M. Gole, Minxiao Han. Impact of Interaction on Local Commutation Failure in Multi-infeed HVDC system. IEEE Power Engineering Letter.