NDLI: Low-voltage ride through control strategy of virtual synchronous generator based on the analysis of excitation state

Content Provider	IET Digital Library
Author	Shi, Kai Ye, Haihan Xu, Peifeng Zhao, Dean Jiao, Long
Abstract	Virtual synchronous generator (VSG) possesses the advantage of friendly interaction with power grid by simulating synchronous generator characteristics. However, its low-voltage ride through (LVRT) capability is insufficient. The excessive output current of VSG easily causes wind turbines to break away from the power grid, which will exacerbate the negative impact of grid fault. Thus, a new LVRT control strategy is proposed based on the analysis of excitation state for VSG. The droop characteristic, reactive power loop and active power loop of the VSG are improved, respectively, by specifically analysing the response characteristics of VSG. Moreover, the additional current loop is redesigned to assist the system operating in the under excitation state and suppress unbalanced currents without changing the original VSG characteristics. Furthermore, a new orientation method is adopted to accelerate the transient process and achieve better transient performance. It is worth noting that the proposed control strategy does not need switch control algorithm with smooth handoff algorithm under grid fault, and it can deal with both symmetric and asymmetric grid voltage drop problems at the same time. The correctness and feasibility of proposed scheme are verified by rigorous theoretical deduction and complete simulation verification.
Starting Page	2165
Ending Page	2172
Page Count	8
ISSN	17518687
Volume Number	12
e-ISSN	17518695
Issue Number	Issue 9, May (2018)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-gtd/12/9
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-gtd.2017.1988
Journal	IET Generation, Transmission & Distribution
Publisher Date	2018-02-12
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Active Power Loop Asymmetric Grid Voltage Drop Problem Control of Electric Power System Current Control Current Loop Droop Characteristic Electric Current Control Excitation State Analysis Grid Fault Negative Impact Low-voltage Ride Through Control Strategy LVRT Control Strategy Orientation Method Power And Energy Control Power Generation Control Power Generation Fault Power Grid Reactive Power Control Reactive Power Loop Symmetric Grid Voltage Drop Problem Synchronous Generator Synchronous Generator Characteristic Simulation Synchronous Machine Transient Process Unbalanced Current Suppression Virtual Synchronous Generator VSG Wind Power Plant Wind Turbine
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Energy Engineering and Power Technology Electrical and Electronic Engineering

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