Enhanced DC Voltage Regulation and Transient Response for Multi-Terminal VSC-HVDC System Using Direct Power Control

Ayalew, Biyadgie; Elmoursi, Mohamed Shawky; El-Saadany, Ehab F.

doi:10.1109/tpwrs.2021.3126437

Cited by 12 publications

(5 citation statements)

References 23 publications

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“…As a result, the nominal droop gains have to be designed considering the permissible dc voltage deviation during converter outage. For this, the constraint is taken considering that a converter with the highest power rating trips while it works at its rated power as it is discussed in [33]. Therefore, the total droop gain of converters in area a m can be written as shown in (26).…”

Section: Nominal Droop Gains Designmentioning

confidence: 99%

Enhanced DC Voltage and Frequency Regulation for High Voltage AC/DC Power Grid

Ayalew

Moursi

El-Saadany

2024

IEEE Trans. Power Syst.

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This work proposes a primary frequency support mechanism for a voltage source converter (VSC) based multiterminal high voltage dc (MTDC) transmission system that interconnects asynchronous ac grids. For the ac disturbance case, an augmented control strategy composed of a coordinated droop control (CDC) and a supplementary controller is developed. In CDC, the droop constants are determined considering the desired disturbance sharing ratio among the ac areas and the loading of the converters. On the other hand, the supplementary controller makes the designed droop constants provide the expected performance independent of the dc network parameters and the VSCs power losses. Therefore, the augmented controller can make the interconnected ac power systems exchange power according to the specified disturbance sharing ratio. In addition, the work introduces a new power rerouting technique to enhance the frequency and the dc voltage regulation of the ac/dc power system when a VSC trips. Furthermore, the droop constants for the nominal operation are designed to make the ac grids share the disturbance due to wind farm power variation based on their strength. Case studies are conducted for evaluation, and the presented technique shows enhanced performance in frequency (for instance, 38% improvement when ac disturbance happens) and dc voltage (for example, almost zero deviation when converter outage occurs) regulations compared to the existing mechanisms in the literature.Index Terms-Supplementary controller, novel power rerouting mechanism, impact of dc grid and VSCs power losses, coordinated droop gain scheme, frequency support, enhanced dc voltage response, converter outage, MTDC system.

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Section: Nominal Droop Gains Designmentioning

confidence: 99%

Enhanced DC Voltage and Frequency Regulation for High Voltage AC/DC Power Grid

Ayalew

Moursi

El-Saadany

2024

IEEE Trans. Power Syst.

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“…It can regulate specific DC line powers separately or distribute them proportionally among DC lines. The authors of [73] suggest a DPC-VCC coordination technique that focuses on enabling timely power-sharing between converters during substantial disturbances at one of the converter stations.…”

Section: E Autonomous Controlmentioning

confidence: 99%

Power Sharing Control Trends, Challenges, and Solutions in Multi-Terminal HVDC Systems: A Comprehensive Survey

Alrajhi,

Daraz,

Alzahrani

et al. 2024

IEEE Access

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This extensive review article provides a comprehensive analysis of control strategies for power sharing in Multi-Terminal High Voltage Direct Current (MT-HVDC) systems utilizing voltage source converters (VSC) and multi-level modular converters (MMC). MT-HVDC systems have become essential components of modern power infrastructures due to their ability to efficiently transmit energy over long distances, connect renewable energy sources, and enhance grid stability. Effective power sharing control is of uttermost importance in these systems for ensuring equitable energy distribution between terminals and grid reliability. The paper begins with a thorough explanation of the fundamental concepts underlying MT-HVDC systems, emphasizing their significance, and examining the various configurations of such systems. The discussion then examines the functions of VSCs and MMCs in these systems, highlighting their distinct advantages and applications. The review analyses in depth the complex power sharing control strategies within VSC-based and MMC-based multi-terminal HVDC systems, as well as a number of control methods, algorithms, and optimization techniques. In addition, the article discusses difficulties and solutions associated with power sharing control in MT-HVDC systems, such as communication and synchronization issues.INDEX TERMS Cascaded controller, DC systems, High voltage direct current (HVDC), modular multilevel converter (MMC) multi-terminal HVDC, Power Control Sharing, Voltage source converter (VSC).

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“…The references [17] and [18] have not addressed integrating large-scale DC and AC power systems. In [19], direct power control (DPC) method has been used for DC voltage regulation and transient response improvement in a VSC-MTDC. However, there is no mention to the loads of DC grid in [19]; also, the AC system is only considered as a three-phase network, and the models of synchronous generators (SGs) and AC lines are not considered.…”

Section: Introductionmentioning

confidence: 99%

“…In [19], direct power control (DPC) method has been used for DC voltage regulation and transient response improvement in a VSC-MTDC. However, there is no mention to the loads of DC grid in [19]; also, the AC system is only considered as a three-phase network, and the models of synchronous generators (SGs) and AC lines are not considered. In [20], an adaptive multi-level control based on dynamic characteristics of MTDC has been presented to improve the transient stability.…”

Section: Introductionmentioning

confidence: 99%

Design of a new robust controller for voltage regulation of DC link in wind‐farm‐side converter integrated with a hybrid AC and DC large‐scale power system

Bagheri

Yousefi

2023

IET Generation Trans & Dist

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The main aim of this paper is to improve dynamic performance of a multi-terminal DC (MTDC) grid in a wind-integrated AC power system through DC voltage control. The proposed approach is based on design of robust H ∞ controller and loop shaping along with mutual quality decomposition method (MQDM). For extracting transfer function of the plant, model of Master-Slave control system is converted to standard feedback control system. Then, based on the obtained difference between singular-value curves of the main open-loop system and the proposed method, the weighting functions of robust H ∞ controller are selected. In the next step, by using the MQDM technique, the transfer function ofthe system in state-space form is evaluated to extract gain of the robust controller. For practicality of the conducted approach, singular-value order reduction Hankel algorithm along with frequency response analysis have been used for designing the gain of the robust controller. The developed method has been implemented on the MTDC converter in the wind farm side to control the voltage of DC grid. The simulations are accomplished in MATLAB, where by considering different uncertainties in the DC grid, wind unit, and the AC grid, robustness of the proposed approach has been clearly demonstrated.

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Enhanced DC Voltage Regulation and Transient Response for Multi-Terminal VSC-HVDC System Using Direct Power Control

Cited by 12 publications

References 23 publications

Enhanced DC Voltage and Frequency Regulation for High Voltage AC/DC Power Grid

Enhanced DC Voltage and Frequency Regulation for High Voltage AC/DC Power Grid

Power Sharing Control Trends, Challenges, and Solutions in Multi-Terminal HVDC Systems: A Comprehensive Survey

Design of a new robust controller for voltage regulation of DC link in wind‐farm‐side converter integrated with a hybrid AC and DC large‐scale power system

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