Unbalanced Voltage/Power Control in Bipolar DC Distribution Grids Using Power Flow Controller

Conference paper (2020)

Authors

J. Liao DC systems, Energy conversion & Storage - EEMCS , Chongqing University
Z. Qin DC systems, Energy conversion & Storage - EEMCS
P. Purgat DC systems, Energy conversion & Storage - EEMCS
Niancheng Zhou Chongqing University
Qianggang Wang Chongqing University
P. Bauer DC systems, Energy conversion & Storage - EEMCS
Research Group
DC systems, Energy conversion & Storage (EEMCS) (TU Delft)
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Published Date

2020

Language

English

Reuse Rights

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Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Electrical Sustainable Energy

Research Group

DC systems, Energy conversion & Storage

Abstract

For a bipolar meshed DC distribution grid, the number of DC transmission lines is greater than converter stations. Therefore, the power flow control (PFC) needs to be introduced to increase the control flexibility of the DC grid. Besides, the unbalanced power between the positive and negative poles in bipolar DC girds may result in a large unbalanced current in the neutral line, causing the pole voltages to deviate from the rated value and increasing the power losses in the bipolar network. This paper aims to realize the PFC of DC distribution grids while suppressing the unbalanced voltage/power of the positive and negative poles. The application of a series parallel-connected PFC in bipolar DC distribution systems is investigated. Subsequently, the relationship between the output voltage of the PFC and the unbalanced power of the bipolar DC distribution grids is derived under the two different control modes of PFC. The simulation model is built in MATLAB/Simulink. The results show that when constant voltage control is applied, the PFC can suppress the unbalanced current in the transmission line, and it can also realize flexible control of the DC power flow.

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