NDLI: Methodology of calculating droop coefficients for stabilising DC voltage in VSC-MTDC system against disturbances

Content Provider	IET Digital Library
Author	Zhang, Fang Li, Qingquan
Abstract	The application of droop control in the voltage-source converter-based multi-terminal direct current (VSC-MTDC) system has been previously proposed in the literature. However, how to determine the droop coefficients to stabilise the DC voltage is still the key issue to concern and research. This study presents a novel calculation methodology for droop coefficients in the case of outage or power step disturbance on any converter station. The overall design objective is to minimise the DC voltage deviation between pre- and post-disturbance, depicted with a quadratic programming model. In addition, the selection method of the optimal DC voltage signal for droop controllers is developed in both cases of communication failure and communication normal. Based on the calculated droop coefficients and selected DC voltage signal, the power coordinated control among the converter stations is implemented to stabilise the DC voltage of the post-disturbance system quickly. Case studies are conducted on the Nordic 32 and New England system, respectively. The simulation results show that the proposed methodology for droop coefficients can significantly reduce the steady-state DC voltage deviations without the limitation of preassigning the maximum allowable DC voltage deviation, compared to the methodologies existing in the literature.
Starting Page	521
Ending Page	535
Page Count	15
ISSN	17518687
Volume Number	13
e-ISSN	17518695
Issue Number	Issue 4, Feb (2019)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-gtd/13/4
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-gtd.2018.5058
Journal	IET Generation, Transmission & Distribution
Publisher Date	2018-11-15
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Calculated Droop Coefficient Calculation Methodology Control of Electric Power System Converter Station Droop Controller Maximum Allowable DC Voltage Deviation Optimal DC Voltage Signal Post-disturbance System Power And Energy Control Power Control Power Converter Power Coordinated Control Power Generation Fault Power Grid Power Supplies to Apparatus Power System Control Quadratic Programming Stabilising DC Voltage Steady-state DC Voltage Deviations Voltage Control Voltage-source Converter Voltage-source Converter-based Multiterminal Direct Current System VSC-MTDC System
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Energy Engineering and Power Technology Electrical and Electronic Engineering

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