Jon Are Suul

Jon Are Suul
Norwegian University of Science and Technology | NTNU · Department of Engineering Cybernetics

Ph.D.

About

154
Publications
63,706
Reads
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4,605
Citations
Introduction
Skills and Expertise
Additional affiliations
August 2017 - July 2020
Norwegian University of Science and Technology
Position
  • Professor
November 2012 - present
Norwegian University of Science and Technology
Position
  • PostDoc Position
November 2007 - April 2012
Norwegian University of Science and Technology
Position
  • PhD Student

Publications

Publications (154)
Article
Full-text available
A framework for unified analysis of small‐signal and large‐signal power system stability based on static and dynamic eigenvalues is proposed in this paper. The presented implementation is based on Gear's method, which is a two‐step integration method for numerical simulation with self‐adaptive time‐step. Furthermore, it can be easily configured for...
Conference Paper
In this paper, non-linear model predictive control (NMPC) without an explicit modulator is applied to modular multilevel converters (MMCs) in the abc reference frame. NMPC can easily be extended for longer prediction horizons as opposed to finite control set model predictive control (FCS-MPC). However, NMPC applied to power converters in previous s...
Article
Full-text available
This study proposes a load management strategy for parking and charging facilities with the capacity to serve several hundreds of electric vehicles. The strategy is built upon two assumptions on power distribution systems of large charging stations: i) they are configured as clusters, each comprising a number of charging units for reduced cabling c...
Article
Full-text available
This paper proposes a strategy to manage an electric vehicle charging station (EVCSs) with a grid-side interface based on a Modular Multilevel Converter (MMC). In such a system, heterogeneous behavior of electric vehicles (EVs), that is independent arrivals-departures and different load demands, could lead to significant loading unbalances among th...
Preprint
Full-text available
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 inevitably exhibit the periodic steady-state (PSS), e.g., VSCs with unbalanced grid connections and the operation of a modular multilevel converter (MMC). In these studies, acquis...
Conference Paper
In this work, an idea based on the bisection algorithm is used to reduce the computational burden of indirect finite control set model predictive control (FCS-MPC) for modular multilevel converters (MMCs). The proposed method greatly reduces the search space for reaching the optimal insertion index (number of submodules to be inserted). Therefore,...
Conference Paper
In this paper, backstepping is applied as a first step of modulation control in the abc reference frame for modular multilevel converters (MMCs). In the second step, reduced indirect FCS-MPC is applied where the number of inserted modules are allowed to change by maximum one from the rounded result of the continuous outcome from backstepping. The b...
Conference Paper
This paper analyses how constant voltage load (CVL) characteristics impacts the dynamics of Inductive Power Transfer (IPT) systems. Specifically, it is demonstrated how modulation strategies relying on elimination of voltage pulses, such as Pulse Density Modulation (PDM), can behave completely different when applied to systems with a CVL instead of...
Article
In this paper, a multi-layer framework is proposed to assess the reliability of Shore-to-Ship Charging (S2SC) systems, considering the potential for failures of the main elements, such as power converters and batteries. The proposed reliability model enables evaluating a S2SC system with redundancy, multi-state system availability, and multi-variab...
Conference Paper
This paper presents an approach for assessing the most suitable locations to provide virtual inertia by HVDC converters. A frequency deviation index quantifying the maximum distance in Hz from each bus in the power system to the Center of Inertia (COI) is utilized as the starting point of the assessment. From this index, the buses that are exhibiti...
Conference Paper
Full-text available
This paper evaluates the operation of a modular transformer-less grid interface topology for large-scale wireless charging of electric vehicles (EVs) under a loading scenario for a commercial parking facility. The studied configuration is based on a Modular Multilevel Converter (MMC) topology where each module is supplying the wireless EV charger i...
Conference Paper
Full-text available
This paper deals with the problem of maximizing the energy transfer between infrastructure for inductive power transfer embedded in the road and a moving electric vehicle. The analysis is assuming a series-series compensated inductive power transfer architecture and the problem is solved analytically to obtain general solutions expressed in terms o...
Article
A type of peak-value dc voltage control (denoted as PK control) was proposed in the literature for supporting the use of a smaller dc-side capacitance when the single-phase Voltage Source Converter (VSC) is operated as a Static Synchronous Compensator (STATCOM). Although it was demonstrated to operate stably under several conditions, it will be rev...
Article
This paper analyses the requirements for load balancing of a new transformer-less grid interface topology for large-scale electric vehicle (EV) charging infrastructures. The proposed configuration utilizes a Modular Multilevel Converter (MMC) to supply wireless EV chargers from each module. The inherent galvanic isolation provided by wireless induc...
Conference Paper
In this paper, a high performance / low complexity reduced indirect finite control set model predictive control (FCS-MPC) method is developed for MMCs. The proposed approach achieves nearly similar dynamic performance as the full indirect FCS-MPC, at a much lower computational burden. The proposed method is developed from the reduced indirect FCS-M...
Article
Second-order Generalized Integrator (SOGI)-based quadrature-signal-generator (QSG), in conjunction with either a phase-locked-loop (PLL) or a frequency-locked-loop (FLL), is widely used as the synchronization unit of grid-tied converters. This paper will reveal and discuss the stability impacts of the frequency-feedback-path (FFP) used in connectin...
Preprint
Full-text available
A dynamic model for lithium-ion battery (LIB) electrode manufacturing and drying is developed in this paper. The model is intended for analysis of different drying technologies , energy requirement calculations, and optimization and control of the drying process. The model shows that the infrared drying is faster than the convective drying when the...
Presentation
Full-text available
This is the presentation of the paper "Stability Analysis of a Virtual Synchronous Machine-based HVDC Link by Gear's Method" for the ENERGYCON 2020 - 6th IEEE International Energy Conference held at the Ramada Plaza Hotel, Gammarth, Tunisia (28. Sept - 1. Oct, 2020)
Conference Paper
Full-text available
Declining equivalent inertia caused by the massive integration of converter-based technologies can increase the risk of stability problems in the future power system. Control of HVDC systems as Virtual Synchronous Machines (VSMs) for providing emulated inertia is a promising countermeasure against this development. However, low inertia converter-do...
Article
Full-text available
More electric aircraft (MEA) architectures consist of several subsystems, which must all comply with the settled safety requirements of aerospace applications. Thus, achieving reliability and fault-tolerance represents the main cornerstone when classifying different solutions. Hybrid electric aircraft (HEA) extends the MEA concept by electrifying t...
Article
Recent developments toward selfdriving cars combined with technology for wireless inductive power transfer can enable electric vehicles that are fully autonomous with respect to operation and energy requirements. Furthermore, technology for wireless opportunity charging and dynamic on-road inductive power transfer can facilitate autonomous electric...
Article
Full-text available
Eigenvalue-based analysis of small-signal dynamics in High Voltage Direct Current (HVDC) transmission systems requires cable models that are compatible with a state-space representation. While distributed parameter models accounting for frequency-dependent effects are inherently incompatible with a state-space representation, a conventional π-model...
Article
Full-text available
This paper presents a harmonic domain single-input single-output (SISO) equivalent modeling technique for the impedance modeling and stability analysis of a single-phase grid-connected voltage-source-converter (VSC). The basis is a conversion technique that transforms a harmonic-transfer-function (HTF)-based model into a SISO equivalent model while...
Article
This paper proposes an integrated method for generating the voltage-source-converters’ (VSCs’) periodical steady-state (PSS) conditions and the harmonic-state-space (HSS)-based impedance model. Since these two objectives can be realized in one unified frequency-domain iteration process, it is briefly referred to as the automatic model generation (A...
Article
This paper presents a control approach for HVDC interconnections that provides damping of frequency oscillations in asynchronous ac grids by introducing a virtual friction for coupling their inertial dynamics. The HVDC interconnection is modelled by using the concept of common and differential power flow, allowing for independent control of the dc...
Preprint
div>Safety-critical power conversion systems play a major role in the paradigm shift towards more electric aircraft (MEA) architectures. This paper reviews the electrical machines and their power electronic systems that are currently competing in the application of integrated starter-generators (S/Gs) in MEA power systems. Motivated by the strict r...
Conference Paper
This paper presents a comparative eigenvalue analysis of the stability characteristics and small signal dynamics of four different control strategies for Synchronous Machine Emulation (SME) by power electronic converters, considering a Synchronous Machine (SM) as the benchmark system. The four SME techniques are selected to represent the most estab...
Conference Paper
This paper presents a technique for damping of oscillations in ac grids by control of VSC-HVDC links. The effect of the proposed controller is equivalent to a mechanical friction between two asynchronous networks (modelled as rotating masses) interconnected by the HVDC link. Therefore, the dynamics of the ac grids will be coupled, and the virtual f...
Preprint
Full-text available
Safety-critical power conversion systems play a major role in the paradigm shift towards more electric aircraft (MEA) architectures. This paper reviews the electrical machines and their power electronic systems that are currently competing in the application of integrated starter-generators (S/Gs) in MEA power systems. Motivated by the strict requi...
Conference Paper
This paper presents an experimental performance evaluation of different control strategies for providing virtual inertia from power electronic converters. The evaluation is based on a laboratory-scale prototype of a point-to-point HVDC transmission system with Modular Multilevel Converters (MMCs). Operation with a grid emulator connected to a realt...
Preprint
Full-text available
A Hilbert filter design is proposed with the intent of assembling a simple, yet frequency adaptive single-phase grid synchronisation unit. The simplicity lies not with the filter itself, but with the linearity of the orthogonal system generator (OSG) and its absence of frequency feedbacks. This is a trait shared with many standard, frequency fixed...
Article
Full-text available
A constrained optimization problem based on the Lagrange multipliers method is formulated to derive the circulating current references of Modular Multilevel Converters (MMC) directly in abc coordinates. The resulting analytic expressions for calculating the circulating current reference signals are designed to eliminate oscillations in the dc-side...
Technical Report
Full-text available
Prosjektet "Zero Emission Digger" (ZED) har som hovedmål å realisere en prototyp for en utslippsfri 30 tonns beltegravemaskin. Hensikten med prosjektet er å utvikle en slik maskin fra et konseptdesign til et kommersielt markedsledende produkt innen miljø- og klimavennlige anleggsmaskiner. Gjennom samarbeid mellom industri- og forskningspartnere vil...
Conference Paper
Two different methods for implementing inertial damping on a Virtual Synchronous Machine (VSM) and their potential for attenuating power system oscillations when utilized in a VSC HVDC terminal are investigated in this paper. As a reference case, the VSM is considered with only a frequency droop providing damping in the virtual swing equation. Then...
Conference Paper
Full-text available
This paper presents a state-space model of a series-series-compensated inductive power transfer (IPT) system suitable for analysis and controller design of wireless charging systems for electric vehicles (EVs). The model can accurately represent a regulated or constant voltage load (CVL) onboard the vehicle. It is shown that for dynamic studies, CV...
Article
This article discusses the general challenges of high-power battery charging in marine applications, with a focus on electric ferries that have tight schedules and short docking times. For such applications, inductive wireless power transfer allows for safe and fully automated operations with better utilization of the docking time for charging the...
Article
Grid synchronization based on Virtual Flux (VF) estimation allows for control of grid-connected power converter without depending on AC-voltage measurements. This is useful in voltage-sensor-less applications for reducing cost and complexity of the control hardware, and can be utilized in case of limited reliability or availability of voltage measu...
Article
Full-text available
The internal currents and voltages of Modular Multilevel Converters (MMCs) contain multiple frequency components in steady state operation and remain time-periodic even when transformed into a synchronously rotating reference frame. This prevents a straightforward state-space representation where a constant equilibrium point is reached and all stat...
Article
Full-text available
The DC-side dynamics of Modular Multilevel Converters (MMCs) can be prone to poorly damped oscillations or stability problems when the second harmonic components of the arm currents are mitigated by a Circulating Current Suppression Controller (CCSC). This paper demonstrates that the source of these oscillations is the uncontrolled interaction of t...
Conference Paper
Full-text available
The average value model of the Modular Multilevel Converter (MMC) is in general non-linear with time periodic variables. Recent developments demonstrated how the MMC model can be transformed into a a Steady-State Time Invariant (SSTI) representation allowing for linearization of the model. While previous modeling efforts for small-signal eigenvalue...
Article
This paper demonstrates that the sum and difference of the upper and lower arm voltages are suitable variables for deriving a generalized state-space model of an MMC which settles at a constant equilibrium in steady-state operation, while including the internal voltage and current dynamics. The presented modelling approach allows for separating the...
Conference Paper
Full-text available
This paper presents a small signal eigenvalue analysis applied to a droop-controlled HVDC terminal based on the Modular Multilevel Converter (MMC) topology. The applied linearised model is derived from previous modelling efforts recently proposed in the literature, which rely on the application of three Park transformations at different frequencies...
Article
This paper presents a comparison of the small-signal stability properties for Virtual Synchronous Machines (VSMs) with dynamic and quasi-stationary representation of the internal Synchronous Machine (SM) model. It is shown that the dynamic electrical equations may introduce poorly damped oscillations when realistic stator impedance values for high...
Article
Full-text available
This paper proposes a combined design and control method for inductive power transfer systems that eliminates the need for overrating the converters in applications where the coupling conditions vary significantly during operation. The method is developed for series-series compensated systems with only one active power electronic converter and a di...
Conference Paper
Full-text available
This paper investigates the small-signal dynamics and stability of an isolated power system where voltage, frequency and power balance are controlled by a Voltage Source Converter (VSC) operated as a Virtual Synchronous Machine (VSM). The analysis is based on a linearized state-space model of the isolated power system, including the VSM with its co...