An Improved Droop Control Method for VSC-MTDC Considering AC Grid Regulation Ability

doi:10.3969/j.issn.1000-7229.2016.06.012

Abstract

Abstract:

The existing droop control methods for the voltage source converter based multi-terminal high voltage direct current （VSC-MTDC） system can reasonably distribute the unbalanced power of DC network among the converter stations， but neglect the bearing capacity of AC system in converter system， and cannot flexibly adjust the power output variation of converter stations according to the transient responses of the AC systems. Therefore， this paper proposes an improved droop control method for VSC-MTDC system considering the adjusting ability of AC grid. The improved method can adaptively modify the slope coefficient of droop control based on the frequency deviation of the AC grid， which can distribute the unbalance power in the DC grid more flexible and reasonable without changing the controller structure. Compared to the droop control method with fixed slope coefficient and the adaptive droop control method with considering power margin， the proposed improved control method is proved to be more effective and superior on the RTDS （real-time digital simulator） platform.

Key words: VSC-MTDC, improved droop control method, response of AC system, frequency deviation

CLC Number:

TM 727

LI Zishou， ZHOU Mi， XU Jian， LAN Tiankai. An Improved Droop Control Method for VSC-MTDC Considering AC Grid Regulation Ability[J]. Electric Power Construction, 2016, 37(6): 79-85.

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