Dynamic modelling and interaction analysis of multi-terminal VSC-HVDC grids through an impedance-based approach

Agbemuko, Adedotun J.; Domínguez‐García, José Luis; Prieto‐Araujo, Eduardo; Gomis‐Bellmunt, Oriol

doi:10.1016/j.ijepes.2019.06.029

Cited by 34 publications

(24 citation statements)

References 32 publications

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“…The value of each α relative to others indicates the relative priority of each terminal. To include the controller(s) to be determined in the optimization framework, ∆I s = −K s ∆V is eliminated from (13) to obtain…”

Section: Controller Design Methodologymentioning

confidence: 99%

“…For the sake of brevity since the focus of this article is on the DC side, a simplified, yet accurate modelling procedure is adopted. The detailed modelling procedures can be found in [12], [13]. The components on the AC side that impact the behaviour on the DC side -inner-loop, AC filter, PLL (phaselocked loop), are integrated through the inner-loop referenceto-output transfer function.…”

Section: Simplified Impedance-based Modelling Of Subsystemsmentioning

confidence: 99%

“…Global Response of the Interconnected System 1) SISO Characterization of Network Responses: Due to interconnection, the expression of (2) must be modified to include the rest of the system. The modified voltage response at each terminal after interconnection can be obtained from the network impedance aggregation [13], [18] and expressed in vectorized form as …”

Section: Interconnection Of Vscsmentioning

confidence: 99%

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Advanced Impedance-Based Control Design for Decoupling Multi-Vendor Converter HVDC Grids

Agbemuko

Domínguez‐García

Prieto‐Araujo

et al. 2020

IEEE Trans. Power Delivery

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A progressive interconnection of existing HVDC links to form grids and the development of completely new HVDC grids from different vendors are expected shortly. One of the current challenges of such endeavour is unintended interactions due to independently designed controllers. This article proposes a design methodology for decentralized controllers to mitigate such interactions in multi-vendor voltage source converter (VSC)-HVDC grids. The approach presented relies on the unique standalone input-output impedance transfer function of each VSC, and the global impedance transfer function as seen from each terminal after interconnection with other VSCs. Subsequently, network-level controllers are designed by attempting to match the global responses at selected locations based on a novel interaction analysis, to the unique transfer function model of the vendors at the corresponding location. This approach reduces the entire problem to an impedance matching problem. We demonstrate the efficacy and flexibility of both the methodology and the designed controllers in mitigating interactions due to the independent design of VSC controllers through nonlinear simulations on a four-terminal droop controlled HVDC grid.

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Section: Controller Design Methodologymentioning

confidence: 99%

Section: Simplified Impedance-based Modelling Of Subsystemsmentioning

confidence: 99%

Section: Interconnection Of Vscsmentioning

confidence: 99%

See 1 more Smart Citation

Advanced Impedance-Based Control Design for Decoupling Multi-Vendor Converter HVDC Grids

Agbemuko

Domínguez‐García

Prieto‐Araujo

et al. 2020

IEEE Trans. Power Delivery

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“…Subsequent to this, the linearized results are substituted into the linearized version of (1) in Laplace domain to obtain the impedance model with impact of PLL and CC included. Comprehensive derivation and details as applied in this work can be found in [34]. The impedance model of the VSC can be obtained as [18] ∆i…”

Section: A Current Controlled Vscmentioning

confidence: 99%

Passivity-Based Analysis and Performance Enhancement of a Vector Controlled VSC Connected to a Weak AC Grid

Agbemuko

Domínguez‐García

Gomis‐Bellmunt

et al. 2021

IEEE Trans. Power Delivery

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Despite attempts to increase the active power capability of vector-controlled voltage source converters (VSCs) connected to very weak grids, the interaction between the control dynamics and physical system is not completely understood. The result is often complex strategies that are difficult to implement. This paper proposes an intuitive modification of the VSC control based on physical considerations and dynamics of existing control. Several physical variables as seen from the point of common coupling (PCC) are found to contribute to the detrimental behavior of the VSC under weak connections. Hence, eliminating the impacts of these variables through feedforward eliminates their influence and significantly improves the active power capability. Notably, the basic structure of the vector controlled VSC is kept and its output-impedance is effectively reshaped. The proposed modification is validated through nonlinear time-domain simulations in MATLAB/Simulink Simscape Power System and results demonstrate the simplicity and intuitiveness of the modified structure.

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“…For instance, a change in the energy reference of the slave Energies 2020, 13,2075 2 of 19 MMC would cause a transient in the DC voltage of the master MMC, and vice versa. These interactions can reduce the stability margin of the system and even lead to instability [15].…”

Section: Introductionmentioning

confidence: 99%

Interaction Assessment and Stability Analysis of the MMC-Based VSC-HVDC Link

et al. 2020

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This paper investigates the dynamic behavior of a modular multi-level converter (MMC)-based HVDC link. An overall state-space model is developed to identify the system critical modes, considering the dynamics of the master MMC and slave MMC, their control systems, and the HVDC cable. Complementary to the state-space model, an impedance-based model is also derived to obtain the minimum phase margin (PM) of the system. In addition, a relative gain array (RGA) analysis is conducted to quantify the level of interactions among the control systems of master and slave MMCs and their impacts on stability. Finally, with the help of the results obtained from the system analysis (eigenvalue, phase margin, sensitivity, and RGA), the system dynamic performance is improved.3 of 19 an eigenvalue and participation factors analysis in Section 6. Moreover, the system minimum PM is calculated through an impedance-based analysis using the Nyquist plot, and the level of interactions among control loops is studied using a frequency-dependent relative gain array (RGA) analysis. Finally, in Section 7, based on the results achieved from the system analyses, the stability of the system is improved by tuning the DC voltage control loop. System DescriptionA typical HVDC link between two AC networks is shown in Figure 1. In such configuration, the master MMC regulates DC voltage while the slave MMC controls active power exchange [27]. Either AC voltage or reactive power can be regulated at both ends. AC network 1 HVDC cable AC network 2 Master Slave V dc control P control

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Dynamic modelling and interaction analysis of multi-terminal VSC-HVDC grids through an impedance-based approach

Cited by 34 publications

References 32 publications

Advanced Impedance-Based Control Design for Decoupling Multi-Vendor Converter HVDC Grids

Advanced Impedance-Based Control Design for Decoupling Multi-Vendor Converter HVDC Grids

Passivity-Based Analysis and Performance Enhancement of a Vector Controlled VSC Connected to a Weak AC Grid

Interaction Assessment and Stability Analysis of the MMC-Based VSC-HVDC Link

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