20 citations · 60 across the 27 of their papers we have counts for
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From Symmetry to Stability: Quantifying Converter Grid Impedance Asymmetry as Indicator of Stability Margin
Chirag Ramgopal Shah, Marta Molinas, Sjur Føyen +1
Although symmetricity in the converter controller is desirable for robust stability margins, a direct link between system-level asymmetricity and instability has yet to be clearly…
Marine Integrated Energy Microgrids
Chendan Li, Muzaidi Othman, Nor Baizura Ahamad +1
Marine sector decarbonization is another important battlefield for meeting the goal of climate action and ensuring the fulfillment of ambitions for a zero-emission society. Driven…
A Practical Method for Automated Modeling and Parametric Stability Analysis of VSC with Periodical Steady State
Chen Zhang, Jon Are Suul, Marta Molinas
Linear Time Periodic (LTP) framework-based analysis of Voltage Source Converters (VSCs) is becoming popular, a driven factor is that many of the existing VSC applications inevitabl…
Impedance Network of Interconnected Power Electronics Systems: Impedance Operator and Stability Criterion
Chen Zhang, Marta Molinas, Atle Rygg +1
Impedance is an intuitive and efficient way for dynamic representation of power electronics devices. One of the evident strengths, when compared to other small-signal methods, is t…
Impact of Digital Time Delay on the Stable Grid Hosting Capacity of Large-scale Centralized Photovoltaic Plant
Jinhong Liu, Lin Zhou, Marta Molinas
In view of the trend towards extensive application of digital controllers in the PV inverter of large-scale centralized photovoltaic (LSCPV) plant and the increasing number of grid…
Understanding the Nonlinear Behavior and Frequency Stability of a Grid-synchronized VSC Under Grid Voltage Dips
Chen Zhang, Marta Molinas, Xu Cai +1
Transients of a grid-synchronized voltage source converter (VSC) are closely related to over- currents and voltages occurred under large disturbances (e.g. a grid fault). Previous…
Comparison of frequency estimation methods for wave energy control
Paula B. Garcia-Rosa, John V. Ringwood, Olav B. Fosso +1
A number of wave energy controllers tune the power take-off (PTO) system to the frequency of incident waves. Since real ocean waves are non-stationary by nature and not defined by…
Harmonic State Space Modeling of a Three-Phase Modular Multilevel Converter
Jing Lyu, Marta Molinas, Xu Cai
This paper presents the harmonic state space (HSS) modeling of a three-phase modular multilevel converter (MMC). MMC is a converter system with a typical multi-frequency response d…
A simple method for shifting local dq impedance models to a global reference frame for stability analysis
Atle Rygg, Marta Molinas, Eneko Unamuno +2
Impedance-based stability analysis in the dq-domain is a widely applied method for power electronic dominated systems. An inconvenient property with this method is that impedance m…
Impedance Analysis of Modular Multilevel Converter Based on Harmonic State-Space Modeling Method
Jing Lyu, Qiang Chen, Xu Cai +1
The small-signal impedance modeling of modular multilevel converter (MMC) is the key for analyzing resonance and stability of MMC-based ac power electronics systems. MMC is a conve…
Non-parametric Impedance based Stability and Controller Bandwidth Extraction from Impedance Measurements of HVDC-connected Wind Farms
Mohammad Amin, Marta Molinas
Impedance measurements have been widely used with the Nyquist plot to estimate the stability of interconnected power systems. Being a black-box method for equivalent and aggregated…
Model Predictive Control of Voltage Source Converter in a HVDC System
Mohammad Amin, Marta Molinas
Model Predictive Control (MPC) method is a class of advanced control techniques most widely applied in industry. The major advantages of the MPC are its straightforward procedure w…
Accurate and reduced SISO Sequence Impedance Models of Grid-tied Voltage Source Converter for Small Signal Stability Analysis
Chen Zhang, Xu Cai, Atle Rygg +1
Impedance models are widely used in assessing small signal stability of grid-tied voltage source converter (VSC) systems. Recent research has proven that impedance models of grid-t…
Augmented Sequence Impedance Networks of Grid-tied Voltage Source Converter for Stability Analysis
Chen Zhang, Xu Cai, Atle Rygg +1
Impedance-based stability analysis is appealing in the case of Single-Input Single-Output (SISO) systems. However, in the case of grid-tied voltage source converter (VSC) systems,…
Coupled and decoupled impedance models compared in power electronics systems
Atle Rygg, Marta Molinas, Chen Zhang +1
This paper provides a comparative analysis of impedance models for power electronic converters and systems for the purpose of stability investigations. Such models can be divided i…
A modified sequence domain impedance definition and its equivalence to the dq-domain impedance definition for the stability analysis of AC power electronic systems
Atle Rygg, Marta Molinas, Zhang Chen +1
Representations of AC power systems by frequency dependent impedance equivalents is an emerging technique in the dynamic analysis of power systems including power electronic conver…
Global Tracking Passivity--based PI Control of Bilinear Systems and its Application to the Boost and Modular Multilevel Converters
R. Cisneros, M. Pirro, G. Bergna +3
This paper deals with the problem of trajectory tracking of a class of bilinear systems with time--varying measurable disturbance. A set of matrices {A,B_i} has been identified, vi…