Method for voltage drop compensation in a multi-terminal dc network

Guobing Song; Xinghua Huang; Ting Wang; Browh Serge Tekpeti; Xiaoning Kang

Method for voltage drop compensation in a multi-terminal dc network

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Author(s): Guobing Song¹ ; Xinghua Huang¹ ; Ting Wang¹ ; Browh Serge Tekpeti¹ ; Xiaoning Kang¹
- Affiliations: 1: School of Electrical Engineering, Xi'an Jiaotong University , 710049 Xi'an , People's Republic of China
Source: Volume 12, Issue 10, 29 May 2018, p. 2378 – 2387
DOI: 10.1049/iet-gtd.2017.1684 , Print ISSN 1751-8687, Online ISSN 1751-8695

Received 25/10/2017, Accepted 17/02/2018, Revised 03/01/2018, Published 22/02/2018

The power flow is driven by the voltage drop in the dc network. In long-distance bulk power transmission cases, the voltage drop across the network might be severe with some node voltages susceptible to load variation. To tackle this problem, a voltage drop compensation method is proposed. A component called voltage compensator (VOLTCOM) is integrated inside the network to modify the network topology and thereby reduce the voltage drop and node voltage variation. From a system perspective, the characteristic of the VOLTCOM is designed and the compensation principle is explained. Then a scheme to lay out VOLTCOMs in the network is given with the objective to minimise the power rating of VOLTCOMs needed. The simulation results show that the load is transmitted with less voltage drop. The voltages remain in the stipulated range even when the grid reaches the planned operating status limits. Also, the VOLTCOM auto-regulates its output without communications with converter stations. The techno-economic assessment demonstrates the economy of the method compared to enlarging conductor cross-section. As an alternative to enlarging conductor cross-section, the proposed method provides an innovation worth consideration in network design.

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Method for voltage drop compensation in a multi-terminal dc network

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