NDLI: Novel MTDC droop scheme with decoupled power control for enhancing frequency stabilities of weak AC systems

Content Provider	IET Digital Library
Author	Li, Yujun Liu, Sining Zhu, Jiebei Yuan, Xiaotian Xu, Zhao Jia, Ke
Abstract	Traditional way to enable frequency support provided by MTDC system for the connected weak AC systems is to modify the power reference of each converter under standard power-sharing droop control based on the weak grid's frequency deviations. However, this scheme artificially couples all asynchronous AC systems to tackle with the frequency disturbances of any connected AC systems, which might result in broader frequency disturbance propagations. To overcome this, this study proposes a decoupled frequency control (DFC) scheme to improve weak AC systems frequency stabilities. First, the relationship between the active power and power set points of each converter is derived by the linearization of MTDC power flow equations. Then, the frequency coupling properties of each AC system with traditional frequency control are derived, and it shows that the frequency disturbance will be propagated to all the connected AC systems with traditional control. Furthermore, the control law of each converter in the proposed DFC is developed through the defined decoupled matrix, and the independent frequency regulation characteristic of each converter can be obtained. Finally, numerical simulations have demonstrated the effectiveness of the proposed DFC scheme in events of load changes and converter loss in the main and weak AC grid.
Starting Page	2007
Ending Page	2016
Page Count	10
ISSN	17521416
Volume Number	14
e-ISSN	17521424
Issue Number	Issue 11, Aug (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-rpg/14/11
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-rpg.2019.1503
Journal	IET Renewable Power Generation
Publisher Date	2020-05-22
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Asynchronous AC System Broader Frequency Disturbance Propagations Connected AC System Connected Weak AC System Control of Electric Power System D.C. Transmission Decoupled Frequency Control Scheme Decoupled Power Control Distributed Power Generation Frequency Control Frequency Coupling Property Frequency Instability Frequency Stability Frequency Support HVDC Power Converter HVDC Power Transmission Independent Frequency Regulation Characteristic Integrated Weak AC System Isolated Weak Inertia AC System Load Flow Low Inertia AC System Main AC Grid MTDC Power Flow Equation MTDC System Multiterminal DC Grid Novel MTDC Droop Scheme Power And Energy Control Power Control Power Generation Control Power Grid Power System Control Power System Economics Power System Interconnection Power System Managemen Power System Operation Power Transmission Control Standard Power-sharing Droop Control Traditional Droop-based Frequency Control Voltage Control Weak AC System Weak Grid
Content Type	Text
Resource Type	Article
Subject	Renewable Energy, Sustainability and the Environment

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