Global optimality of inverter dynamic voltage support
File(s)
Author(s)
Guo, Yifei
Pal, Bikash Chandra
Jabr, Rabih A
Geng, Hua
Type
Journal Article
Abstract
This paper investigates the dynamic voltage support (DVS) of inverter-based resources (IBRs) under voltage sags to enhance the low-voltage ride-through performance. The DVS problem is formulated as a nonconvex optimization program that maximizes the positive-sequence voltage magnitude at the point of common coupling (PCC) subject to the current, active power, and synchronization stability constraints. Then, we perform the optimality analysis to explore the global optimum analytically. It is found that the unique global optimum has three scenarios/stages (S1S3), which depends on the specific relationship among grid voltage, grid strength, and physical limits of IBRs. The explicit closed-form solutions in S1 and S3 are derived, and the optimality conditions (an implicit solution) of S2 are provided, which guarantees the global optimality and enables the compatibility with fast real-time control. Finally, we implement the optimum with a grid-connected single-stage photovoltaic (PV) power plant by integrating a DVS controller. Dynamic simulations are carried out under different scenarios to test our proposal. The robustness against model errors is also discussed. Dynamic simulations are carried out under different scenarios to test our proposal and compare it with other existing methods.
Date Issued
2022-09-01
Date Acceptance
2021-12-05
Citation
IEEE Transactions on Power Systems, 2022, 37 (5), pp.3947-3957
ISSN
0885-8950
Publisher
Institute of Electrical and Electronics Engineers (IEEE)
Start Page
3947
End Page
3957
Journal / Book Title
IEEE Transactions on Power Systems
Volume
37
Issue
5
Copyright Statement
© 2021 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
Sponsor
Engineering & Physical Science Research Council (EPSRC)
Identifier
https://ieeexplore.ieee.org/document/9645344
Grant Number
EP/T021713/1
Subjects
Science & Technology
Technology
Engineering, Electrical & Electronic
Engineering
Voltage control
Inverters
Power system stability
Synchronization
Stability analysis
Power system dynamics
Power quality
Grid-connected inverter
inverter-based resources (IBRs)
positive-sequence voltage
dynamic voltage support (DVS)
optimality
FAULT-RIDE-THROUGH
GENERATION INVERTERS
CONTROL STRATEGY
POWER-PLANTS
CONVERTER
CAPABILITY
STABILITY
MAXIMIZE
SYSTEM
GRIDS
0906 Electrical and Electronic Engineering
Energy
Publication Status
Published
Date Publish Online
2021-12-10