Reduced-Order Modelling Method of Grid-Connected Inverter with Long Transmission Cable

Zhou, Weihua; Li, Han; Chen, Zhe

doi:10.1109/iecon.2018.8591133

Cited by 9 publications

(14 citation statements)

References 20 publications

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“…Since analytical transfer functions cannot be obtained due to strong non-linearity, non-parametric impedance models are developed for submarine cables. A reduced order modelling for long lines is proposed in [13]; however, these models are based on S-parameter concept, which cannot be used to aggregate on a system level and furthermore these models do not consider the non-linear hyperbolic equations which are typical characteristics of submarine cables.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Star and String Offshore DC Collector Grid Topologies on the Aspect of Stability—An Impedance Approach

et al. 2021

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Offshore Direct Current (DC) collector grids are a promising technology for decreasing the installation and operation costs of offshore wind parks. Nevertheless, the stability properties and hence the design of such DC collector grids is not common or standardised. Hence, this paper describes an attempt to fill these gaps by analysing the stability of two different types of DC collector grids—star and string—by considering identical operating conditions. The approach follows a non-parametric formulation of the impedance based Nyquist Stability Criterion. The hyperbolic Π equivalent formulation of the telegraph equation is adopted for modelling the submarine cable due to high capacitance that is distributed and thus the conventional 50 Hz Π-model is not sufficient anymore. Furthermore, the paper shows how to integrate the complex dynamics of wind turbines into the overall stability assessment through an impedance building algorithm. Finally, it is shown how to stabilise the collector grids by means of active control parameter changes and it has been observed that the star configuration of wind turbines is more favourable on account of stability and controllability.

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Section: Introductionmentioning

confidence: 99%

Comparison of Star and String Offshore DC Collector Grid Topologies on the Aspect of Stability—An Impedance Approach

et al. 2021

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“…In addition, the order of the fitted state space model/ transfer function of power cable can be very high, since the parasitic capacitance exists along the power cable [7,8,12]. There are numerous classical model order reduction (MOR) methods for linear time invariant (LTI) systems [6,7,10,11,[13][14][15][16][17], among which the singular value decomposition (SVD)-based approximation method has been gained much population [11,14].…”

Section: Introductionmentioning

confidence: 99%

Vector Fitting-Based Reduced Order Modelling Method for Power Cables

Zhou¹,

Wang²,

Chen³

2019

15th IET International Conference on AC and DC Power Transmission (ACDC 2019)

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To study the frequency and damping characteristics of power cable, high-order RLC circuit models are commonly required, which involves high computational burdens for modelling and analysis. In this paper, a reduced-order modelling method for power cable is proposed on the basis of Prony analysis (PA), vector fitting (VF) algorithm and balanced truncation (BT) algorithm. The state space model of power cable is first obtained by fitting terminal frequency responses using PA and VF instead of directly building mathematical model; Then the lowfrequency characteristics is maintained using BT algorithm. The fitting accuracy can be improved by increasing the order. The proposed method is able to reduce computational burdens for power cable modelling, which thus improves modelling and analysis efficiency. Simulation results are given to validate the effectiveness of the proposed modelling method.

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“…To enhance power quality, passive components such as LCL and L filters are commonly used to mitigate high-order harmonics. However, the interaction between inner control loops and passive components can cause system resonance as variation of grid impedance in a wide frequency range [2]- [6]. Therefore, it is significant to develop modelling and analysis method for revealing mechanism and identifying possibility of oscillation phenomena at early planning stage of power plant.…”

Section: Introductionmentioning

confidence: 99%

Decoupled Multi-Port Impedance Modelling Method of Transmission Network in Inverter-Fed Power Plant

Zhou

Chen

2018

2018 International Conference on Smart Grid (icSmartGrid)

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This paper presents a decoupled multi-port impedance modelling method of transmission network for stability analysis of inverter-fed power plant. The decoupled three-port and four-port impedance model are first derived. On the basis of them, multi-port impedance model of transmission network are deduced, where multiple branches-based transmission network is modelled by means of Norton equivalent circuit. In addition, stability analysis based on proposed impedance network modelling method is performed. Simulation results are given to validate effectiveness of the proposed decoupled multi-port impedance modelling and stability analysis method. The proposed modelling method is able to simplify impedance modelling procedure, which performs impedance based stability analysis for inverterfed power plant with complicated transmission network in a computation-less way. Index Terms-Decoupled impedance modelling, inverter-fed power plant, impedance-based stability analysis, transmission network.

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Reduced-Order Modelling Method of Grid-Connected Inverter with Long Transmission Cable

Cited by 9 publications

References 20 publications

Comparison of Star and String Offshore DC Collector Grid Topologies on the Aspect of Stability—An Impedance Approach

Comparison of Star and String Offshore DC Collector Grid Topologies on the Aspect of Stability—An Impedance Approach

Vector Fitting-Based Reduced Order Modelling Method for Power Cables

Decoupled Multi-Port Impedance Modelling Method of Transmission Network in Inverter-Fed Power Plant

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