NDLI: Improved practical method for low-inertia VSC-HVDC stability analysis in weak system

Content Provider	IET Digital Library
Author	Li, Baohong Chen, Shi Liu, Tianqi
Abstract	The physical mechanism of the instability of the low-inertia voltage source converter (VSC) caused by the phase-locked loop (PLL) in a weak system is clearly revealed in a simplified way. Based on the complex torque method, the joint influence of the PLL and the system strength on the VSC is studied through the defined key stable component. To keep the VSC stable, the value of the key stable component must be positive. The component is decided by AC voltage, short-circuit-ratio (SCR), reactive power, and PLL parameters. Improper PLL parameters and weak AC system could make the key stable component negative. To keep the VSC stable in a weak system, the PLL parameters can be adjusted according to the curve of the key stable component, which means suitably decreasing k p and increasing k i. Finally, simulations are implemented to validate the theory, which matches well with the findings.
Starting Page	5072
Ending Page	5079
Page Count	8
ISSN	17518687
Volume Number	14
e-ISSN	17518695
Issue Number	Issue 22, Nov (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-gtd/14/22
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-gtd.2019.1887
Journal	IET Generation, Transmission & Distribution
Publisher Date	2020-05-18
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	AC Voltage Complex Torque Method Control of Electric Power System D.C. Transmission Defined Key Stable Component Demodulator Discriminators And Mixers HVDC Power Converter HVDC Power Transmission Improper PLL Parameter Improved Practical Method Key Stable Component Negative Low-inertia Voltage Source Converter Low-inertia VSC-HVDC Stability Analysis Modulator Phase Locked Loop Physical Mechanism Power Converter Power Supplies to Apparatus Power System Control Power System Stability Power Transmission Control Reactive Power Stability in Control Theory System Strength VSC Stable Weak AC System Weak 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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