A Decentralized Optimal Load Current Sharing Method for Power Line Loss Minimization in MT-HVDC Systems

This paper discusses the elimination of DC voltage deviation and the enhancement of load current sharing accuracy in multi-terminal high voltage direct current (MT-HVDC) systems. In order to minimize the power line losses in different parallel network topologies and to insure the stable operation of systems, a decentralized control method based on a modified droop control is presented in this paper. Averaging the DC output voltage and averaging the output current of two neighboring converters are employed to reduce the congestion of the communication network in a control system, and the decentralized control method is implemented. By minimizing the power loss of the cable, the optimal load current sharing proportion is derived in order to achieve rational current sharing among different converters. The validity of the proposed method using a low bandwidth communication (LBC) network for different topologies is verified. The influence of the parameters of the power cable on the control system stability is analyzed in detail. Finally, transient response simulations and experiments are performed to demonstrate the feasibility of the proposed control strategy for a MT-HVDC system.

Statistics

Show / Hide Statistics

Cumulative Counts from September 30th, 2019
Multiple requests among the same browser session are counted as one view. If you mouse over a chart, the values of data points will be shown.

Cite this article

[IEEE Style]

Y. Liu, W. Song, N. Li, L. Bai, Y. Ji, "A Decentralized Optimal Load Current Sharing Method for Power Line Loss Minimization in MT-HVDC Systems," Journal of Power Electronics, vol. 16, no. 6, pp. 2315-2326, 2016. DOI: 10.6113/JPE.2016.16.6.2315.

[ACM Style]

Yiqi Liu, Wenlong Song, Ningning Li, Linquan Bai, and Yanchao Ji. 2016. A Decentralized Optimal Load Current Sharing Method for Power Line Loss Minimization in MT-HVDC Systems. Journal of Power Electronics, 16, 6, (2016), 2315-2326. DOI: 10.6113/JPE.2016.16.6.2315.