Blar i NTNU Open på forfatter "Zhang, Chen"
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Accurate aggregated modelling of wind farm systems in modified sequence domain for stability analysis
Zong, Haoxiang; Lyu, Jing; Cai, Xu; Zhang, Chen; Molinas Cabrera, Maria Marta; Rao, Fangquan (Peer reviewed; Journal article, 2019)With the wind power penetration rate continuously rising, a suitable wind farm model considering both accuracy and simplicity is required for power system stability analysis. To accomplish this goal, an accurate aggregated ... -
Analysis of Bifurcation Behaviors in MMC Connected to a Weak Grid
Haoxiang, Zong; Lyu, Jing; Xu, Cai; Molinas Cabrera, Maria Marta; Zhang, Chen; Renxing, Yang; Fangquan, Rao (Chapter, 2018)Conventional small-signal approaches present obvious advantages applied in analyzing closed-loop stability in power electronics systems. However, linearized models fall short of predicting any nonlinear behavior which means ... -
Autonomous Synchronizing and Frequency Response Control of Multi-terminal DC Systems with Wind Farm Integration
Yang, Renxin; Shi, Gang; Cai, Xu; Zhang, Chen; Li, Gen; Liang, Jun (Journal article; Peer reviewed, 2020)Recent analyses have shown that the grid-integration of offshore wind farms through MTDC systems has brought low inertia and small-signal stability issues, in which the dynamics of phase-locked-loop (PLL) play a crucial ... -
Control of a Type-IV Wind Turbine with the Capability of Robust Grid-Synchronization and Inertial Response for Weak Grid Stable Operation
Sang, Shun; Zhang, Chen; Cai, Xu; Molinas Cabrera, Maria Marta; Zhang, Jianwen; Rao, Fangquan (Journal article; Peer reviewed, 2019)With the increasing penetration of wind power, the effective inertia of the power system reduces. Besides, a series of interactive instability issues including sub-synchronous oscillations and harmonic oscillations were ... -
Frequency Domain Modelling and Stability Analysis of a DFIG-based Wind Energy Conversion System Under None-compensated AC Grids: Impedance Modelling Effects and Consequences on Stability
Zhang, Chen; Molinas Cabrera, Maria Marta; Rygg, Atle; Cai, Xu (Journal article; Peer reviewed, 2019)Impedance-based frequency domain method is an effective tool for the stability assessment of a doubly-fed induction generator (DFIG) system. Several impedance models have been proposed recently, however, these models are ... -
Frequency Domain Modelling for Assessment of Hilbert and SOGI Based Single-Phase Synchronisation
Føyen, Sjur; Fosso, Olav B; Zhang, Chen; Molinas Cabrera, Maria Marta (Chapter, 2019)Two different single-phase synchronisation schemes based on orthogonal system generation (OSG) are modelled in the linear, time-periodic framework. The frequency adaptive Hilbert phase locked loop (PLL) and the frequency-fixed ... -
Harmonic Transfer-function-based Impedance Modelling of a Three-phase VSC for Asymmetric AC Grids Stability Analysis
Zhang, Chen; Molinas Cabrera, Maria Marta; Rygg, Atle; Lyu, Jing; Cai, Xu (Journal article; Peer reviewed, 2019)Impedance modeling and stability analysis of a grid-VSC system under symmetric ac grids have been extensively discussed in the literature, where the dq domain impedances are usually adopted. As for asymmetric ac grids, ... -
Harmonic-Domain SISO Equivalent Impedance Modeling and Stability Analysis of a Single-Phase Grid-Connected VSC
Zhang, Chen; Molinas Cabrera, Maria Marta; Føyen, Sjur; Suul, Jon Are Wold; Isobe, Takanori (Peer reviewed; Journal article, 2020)This article 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 ... -
Impedance-based Analysis of Interconnected Power Electronics Systems: Impedance Network Modeling and Comparative Studies of Stability Criteria
Zhang, Chen; Molinas Cabrera, Maria Marta; Rygg, Atle; Cai, Xu (Journal article; Peer reviewed, 2019)Impedance is an intuitive and effective way for dynamical representation of power electronics devices (e.g. VSCs). One of its strengths towards others is the natural association with circuits. However, impedances of VSCs ... -
An Integrated Method for Generating VSCs’ Periodical Steady-state Conditions and HSS-based Impedance Model
Molinas Cabrera, Maria Marta; Zhang, Chen; Føyen, Sjur; Suul, Jon Are; Takanori, Isobe (Peer reviewed; Journal article, 2020)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 ... -
Mimo impedance based stability analysis of DFIG-based wind farm with MMC-HVDC in modifed sequence domain
Zong, Haoxiang; Lyu, Jing; Zhang, Chen; Cai, Xu; Molinas Cabrera, Maria Marta; Rao, Fangquan (Chapter, 2019)The modular multilevel converter (MMC) based high-voltage direct current (HVDC) transmission is widely applied for the large-scale wind farm integration making its interaction stability analysis especially significant. ... -
Modeling and analysis of grid-synchronizing stability of a Type-IV wind turbine under grid faults
Zhang, Chen; Cai, Xu; Rygg, Atle; Molinas Cabrera, Maria Marta (Peer reviewed; Journal article, 2020)Transient behavior and response of wind turbines have been extensively studied in the context of the low-voltage-ride-through (LVRT) for many years, in which the identified transients are mostly associated with circuit ... -
Modified sequence domain impedance modelling of the modular multilevel converter
Zong, Haoxiang; Lyu, Jing; Zhang, Chen; Molinas Cabrera, Maria Marta; Cai, Xu; Rao, Fangquan (Chapter, 2019)The accurate sequence impedance model of the modular multilevel converter (MMC) is essential for the precise stability analysis of various MMC-based interconnected systems. This paper presents a modified sequence impedance ... -
On the Impedance Modeling and Equivalence of AC/DC Side Stability Analysis of a Grid-tied Type-IV Wind Turbine System
Zhang, Chen; Molinas Cabrera, Maria Marta; Rygg, Atle; Cai, Xu (Journal article; Peer reviewed, 2018)Impedance modeling of a Type-IV wind turbine is usually associated with model reductions, e.g. the grid-side converter (GSC) is modeled in detail, whereas the machine-side converter (MSC) is simplified as a constant power ... -
Properties and Physical Interpretation of the Dynamic Interactions between Voltage Source Converters and Grid: Electrical Oscillation and Its Stability Control
Zhang, Chen; Molinas Cabrera, Maria Marta; Rygg, Atle; Li, Zheng; Cai, Xu (Journal article; Peer reviewed, 2017)Voltage source converters (VSCs) play an important role in the power conversion of renewable power generation (RPG) systems. Conventional power systems are considerably affected by power electronic devices in systems with ... -
Sequence Domain SISO Equivalent Models of a Grid-tied Voltage Source Converter System for Small-Signal Stability Analysis
Zhang, Chen; Molinas Cabrera, Maria Marta; Rygg, Atle; Cai, Xu (Journal article; Peer reviewed, 2017)This paper presents a generalized method for converting multi-input and multi-output (MIMO) dq impedance model of a grid-tied voltage source converter system into its sequence domain single-input and single-output (SISO) ... -
Synchronizing Stability Analysis and Region of Attraction Estimation of Grid-Feeding VSCs Using Sum-of-Squares Programming
Zhang, Chen; Molinas Cabrera, Maria Marta; Zheng, Li; Cai, Xu (Peer reviewed; Journal article, 2020)Grid-synchronizing Stability (GSS) is an emerging issue related to grid-feeding voltage-source converters (VSCs). Its occurrence is primarily related to the non-linear dynamics of a type of vastly applied synchronization ... -
Understanding the Nonlinear Behaviour and Synchronizing Stability of a Grid-Tied VSC Under Grid Voltage Sags
Zhang, Chen; Molinas Cabrera, Maria Marta; Lyu, Jing; Zong, Haoxiang; Cai, Xu (Chapter, 2019)Transients of a typical grid synchronizing VSC are closely associated with the over-current and over-voltage in circuits. Previous analysis in evaluating such transient phenomenon usually ignore the nonlinear control effects ...