Modeling of VSC Connected to Weak Grid for Stability Analysis of DC-Link Voltage Control

Huang, Yunhui; Yuan, Xiaoming; Hu, Jiabing; Peng, Zhou

doi:10.1109/jestpe.2015.2423494

Cited by 286 publications

(144 citation statements)

References 17 publications

(17 reference statements)

Supporting

Mentioning

126

Contrasting

Order By: Relevance

“…As declared in [12], weak AC system deteriorates DC-bus voltage control stability and limits power transfer ability in VSC-HVDC. Likewise, eigenvalue analysis in [13] and [14] shows that damping ratio for DC-bus voltage control in variablespeed wind power generator becomes reduced with decrease of AC system strength. The authors in [15] conclude that DC voltage stability of VSC-HVDC connected to weak grid gets damaged with increase of power flow through eigenvalue analysis and frequency domain approach, which conforms with the time domain simulation results in [16].…”

Section: Introductionmentioning

confidence: 97%

DC-Bus Voltage Control Stability Affected by AC-Bus Voltage Control in VSCs Connected to Weak AC Grids

Huang

Yuan

et al. 2016

IEEE J. Emerg. Sel. Topics Power Electron.

Self Cite

162

View full text Add to dashboard Cite

With widely application of voltage source converters (VSCs) in power system, DC-bus voltage control instabilities increasingly occurred in practical conditions, especially in weak AC grid, which poses challenges on stability and security of power converters applications. This paper aims to give physical insights into stability of DC-bus voltage control affected by ACbus voltage control in VSC connected to weak grid. Concepts of damping and restoring components are developed for DC-bus voltage to describe stability of DC-bus voltage control. Impact of AC-bus voltage control on DC-bus voltage control stability can be revealed by investigating impact of AC-bus voltage control on damping and restoring components essentially. Furthermore, detailed analysis for impact of AC-bus voltage control on damping and restoring components are presented with considering varied AC system strengths, operating points, and AC-bus voltage control parameters. Simulation results from 1.5-MW full-capacity wind power generation system are demonstrated which conform well to the analysis. Finally the experiment results validate the analysis. Index Terms-DC-bus voltage control, AC-bus voltage control,small-signal stability, voltage source converter, weak grid. . His current research interests include gridintegration of large-scale renewables, modular multilevel converter (MMC) for HVDC applications, and transient analysis and control of semiconducting power systems. Dr. Hu is the author/coauthor of more than 70 peer-reviewed technical papers and one monograph "Control and Operation of Grid-Connected Doubly-Fed Induction Generators", and holds more than 20 issued/pending patents. Her research interests include dynamic modeling, stability analysis and control of power system with multi power converters.Dong Wang was born in Huanggang, Hubei, China, in 1988. He received the B. Eng. and M. Eng. degree from Huazhong University of Science and Technology in 2012 and 2015, respectively. He is currently working toward the Ph.D. degree in the Department of Electrical and Electronic Engineering at The University of Hong Kong. His research interests include modeling and control of wind turbines, in particular on small signal stability analysis and control of grid-integrated DFIG-based Wind Turbines in electromagnetic timescale.

show abstract

Section: Introductionmentioning

confidence: 97%

DC-Bus Voltage Control Stability Affected by AC-Bus Voltage Control in VSCs Connected to Weak AC Grids

Huang

Yuan

et al. 2016

IEEE J. Emerg. Sel. Topics Power Electron.

Self Cite

162

View full text Add to dashboard Cite

show abstract

“…Several studies [16][17][18][19] have proposed a system strength evaluation and design for linking high-voltage direct current (HVDC) and wind farms. Certain studies [20][21][22] have introduced inverter parameters and controls that affect the stability of inverter-based equipment connected to the grid.…”

Section: Introductionmentioning

confidence: 99%

Evaluating Influence of Inverter-based Resources on System Strength Considering Inverter Interaction Level

et al. 2020

View full text Add to dashboard Cite

The penetration of renewable energy sources (RESs) equipped with inverter-based control systems such as wind and solar plants are increasing. Therefore, the speed of the voltage controllers associated with inverter-based resources (IBRs) has a substantial impact on the stability of the interconnected grid. System strength evaluation is one of the important concerns in the integration of IBRs, and this strength is often evaluated in terms of the short circuit ratio (SCR) index. When IBRs are installed in an adjacent location, system strength can be weaker than evaluation by SCR. This study proposes an inverter interaction level short circuit ratio (IILSCR) method by tracing IBRs output flow. The IILSCR can accurately estimate system strength, wherein IBRs are connected in adjacent spots, by reflecting the interaction level between IBRs. The study also demonstrates the efficiency of IILSCR by applying this method to Institute of Electrical and Electronics Engineers (IEEE) 39 bus test system and future Korea power systems.

show abstract

“…However, the above analyses mainly focused on the dynamics of the PLL, and the DC voltage control (DVC) dynamics were not included. Generally, the interactions between DVC, terminal voltage control and PLL-whose dynamics lie within the DVC timescale (around 100 ms)-become crucial under weak-grid conditions and could bring the corresponding stability problems [10]. Hence, a thorough analysis of the effect mechanism of frequency variation on the DVC timescale stability problems is also needed.…”

Section: Introductionmentioning

confidence: 99%

Modeling and Analyzing the Effect of Frequency Variation on Weak Grid-Connected VSC System Stability in DC Voltage Control Timescale

Yang

Yuan

2019

Energies

View full text Add to dashboard Cite

The effect of frequency variation on system stability becomes crucial when a voltage source converter (VSC) is connected to a weak grid. However, previous studies lack enough mechanism cognitions of this effect, especially on the stability issues in DC voltage control (DVC) timescale (around 100 ms). Hence, this paper presented a thorough analysis of the effect mechanism of frequency variation on the weak grid-connected VSC system stability in a DVC timescale. Firstly, based on instantaneous power theory, a novel method in which the active/reactive powers are calculated with the time-varying frequency of voltage vectors was proposed. This method could intuitively reflect the effect of frequency variation on the active/reactive powers and could also help reduce the system order to a certain extent. Then, a small-signal model was established based on the motion equation concept, to depict the effect of frequency variation on the weak grid-connected VSC system dynamics. Furthermore, an analytical method was utilized to quantify the effect of frequency variation on the system’s small-signal stability. The quantitative analysis considered the interactions between the DC voltage control, the terminal voltage control, phase-locked loop, and the power network. Finally, case studies were conducted, and simulation results supported the analytical analyses.

show abstract

Modeling of VSC Connected to Weak Grid for Stability Analysis of DC-Link Voltage Control

Cited by 286 publications

References 17 publications

DC-Bus Voltage Control Stability Affected by AC-Bus Voltage Control in VSCs Connected to Weak AC Grids

DC-Bus Voltage Control Stability Affected by AC-Bus Voltage Control in VSCs Connected to Weak AC Grids

Evaluating Influence of Inverter-based Resources on System Strength Considering Inverter Interaction Level

Modeling and Analyzing the Effect of Frequency Variation on Weak Grid-Connected VSC System Stability in DC Voltage Control Timescale

Contact Info

Product

Resources

About