Normalized Control and Operation of VSC-HVDC Bidirectional Transmission System

doi:10.3969/j.issn.1000-7229.2016.04.017

Abstract

Abstract:

n view of the imbalanced phenomenon of energy caused by the geographical location and seasonal variation, this paper proposes a normalized control strategy with bidirectional transmission based on voltage source converter-high voltage direct current （VSC-HVDC） system, which can contact grid by partition to realize the complementary advantages. Firstly, the control system determines the reference value of transmission power between AC and DC system through normalizing the droop characteristics on both sides of voltage source converter. Then, we obtain the transmission power of DC transmission line through comparing the size and direction of the reference value of the transmission power between the two ends of DC transmission line. Finally, it achieves bidirectional transmission and power balance between two grids by controlling the DC voltage at both ends of DC line. We design three different work situations and carry out simulation study in real time digital simulator （RTDS）. The simulation results verify the effectiveness of the proposed control strategy, which realizes the low carbon power dispatching.

Key words: voltage source converter-high voltage direct current （VSC-HVDC）, bidirectional transmission, contacting by partition, droop characteristic, normalization, complementary energy

CLC Number:

TM 721

ZHAO Tingting, XIAO Yu, HAN Xiaoqing, WANG Peng. Normalized Control and Operation of VSC-HVDC Bidirectional Transmission System[J]. Electric Power Construction, 2016, 37(4): 110-116.

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