Improvement of stability assessment of VSCHVDC transmission systems

Nguyen, Manh-Tuan; Rudion, Krzysztof; Styczynski, Zbigniew A.

doi:10.1109/cris.2010.5617545

Cited by 5 publications

(5 citation statements)

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“…The benefit of these techniques is that grid faults do not impact WFs, but they require additional hardware, including breakers, braking resistors, and series transformers. Rapid active power reduction can also be accomplished through the utilization of communication-based de-loading control [12], voltage droop control [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27], and frequency modulation [28][29][30]. The DC-link communication channels with wind turbines (WT) eliminate the need for additional offshore converter control, but they also cause reliability and latency issues.…”

Section: Introductionmentioning

confidence: 99%

“…However, this could lead to significant DC overvoltage because of a voltage signal processing delay in filter and bandwidth constraints in the current signal management of WTs. To keep the DC voltage at the required level, the offshore converter quickly reduces the offshore grid voltage to zero in [19][20][21][22][23][24][25][26][27]. The phase lock loop (PLL)-based wind turbine converters may experience synchronization problems using this technology, which does not require any changes to the WT control [31][32][33].…”

Section: Introductionmentioning

confidence: 99%

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Battery Power Control Strategy for Intermittent Renewable Energy Integrated Modular Multilevel Converter-Based High-Voltage Direct Current Network

2023

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Modular multilevel converters (MMC) play a dominant role in integrating remotely located renewable energy resources (RER) over the high-voltage direct current (HVDC) transmission network. The fault ride-through capabilities of the MMC-HVDC network during low-voltage faults and the power fluctuation due to RER intermittency are the major obstacles to the effective integration of renewable energy. In response, this article proposes a local voltage-based combined battery energy control scheme for a PV-wind-battery connected MMC-HVDC system to regulate the HVDC-link voltage during low-voltage faults at the point of common coupling of alternating current grids and to reduce the intermittent RER power fluctuation. The proposed technique removes the dynamic braking resistor from the HVDC-link and smoothly integrates the RER without active power reduction of renewable energy under low-voltage faults. Symmetrical and unsymmetrical low-voltage faults have been conducted to validate the effectiveness of the proposed control scheme for the battery in mitigating surplus energy in the HVDC-link. Additionally, wind speed, solar radiation, and temperature have been changed to confirm the improved performance of the battery energy management system. The complete systems have been simulated and tested in a real-time digital simulator (RTDS) and using dSPACE-based controller hardware in a loop setup.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Battery Power Control Strategy for Intermittent Renewable Energy Integrated Modular Multilevel Converter-Based High-Voltage Direct Current Network

2023

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“…Rapid active power reduction can also be accomplished through the utilization of communication-based de-loading control [12], voltage droop control [13], [14], [15], [16], [17], [18], [19], [20], [21], [22], [23], [24], [25], [26], [27], and frequency modulation [28], [29], [30]. The DC-link communication channels with wind turbines (WT) eliminate the need for additional offshore converter control, but they also cause reliability and latency issues.…”

Section: Introductionmentioning

confidence: 99%

“…However, this could lead to significant DC overvoltage because of the voltage signal processing delay in the filter and bandwidth constraints in the current signal management of WTs. To keep the DC voltage at the required level, the offshore converter quickly reduces the offshore grid voltage to zero in [15], [16], [17], [18], [19], [24], [25], [26], and [27]. The phase lock loop (PLL)-based wind turbine converters may experience synchronization problems using this technology, which does not require any changes to the WT control [31], [32], [33].…”

Section: Introductionmentioning

confidence: 99%

Fault Ride Through and Intermittency Improvement of Renewable Energy Integrated MMC-HVDC System Employing Flywheel Energy Storage

et al. 2023

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Modular multilevel converter (MMC)-based high voltage direct current (HVDC) transmission networks integrate remotely located distributed renewable energy resources (RER). The intermittent nature of RER and symmetrical and asymmetrical AC-side low-voltage faults produce operational difficulties. It reduces the MMC's ability to transfer the rated power, which raises the voltage of the HVDC link. Therefore, the MMC-HVDC network's fault ride-through (FRT) capabilities and the power fluctuation brought on by RER intermittency are potential challenges to the efficient integration of renewable energy resources. In response, this article suggests an energy control scheme for the flywheel energy storage of the PV-wind-MMC-HVDC system in order to regulate the HVDC-link voltage during low voltage faults at the point of common coupling (PCC) of the AC grids and to address the problem of power fluctuation caused by intermittent RER and sudden load changes. The suggested method eliminates the dynamic braking resistor (DBR) from the HVDC link and seamlessly integrates the RER without actively reducing renewable energy power during low voltage faults. To test the effectiveness of the proposed control method for the flywheel energy storage in reducing excess energy in the HVDC link, symmetrical and asymmetrical low voltage faults have been conducted. In addition, changes in wind speed, solar radiation, and temperature have been made to validate the flywheel energy management system's performance. A real-time digital simulator (RTDS) and dSPACE-based controller hardware in loop (CHIL) configuration with a complete system have been used to simulate and evaluate the entire system.INDEX TERMS Modular multilevel converter, PV-wind integration, flywheel energy management system, AC side low voltage faults.

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“…Several different solutions have been proposed to manage the control systems of the wind farm and HVDC interconnector to minimize delays in the wind farm output power reduction and to add elements which protect the system until the power balance can be restored [5]. The major propositions can be classified into two groups: control strategies for a fast reduction of power from the wind farm [4,[6][7][8][9][10][11][12], and methods to divert the excess energy, usually by dissipation in a dedicated circuit [9,13,14]. The term Energy Diverting Converter (EDC) is used in this document to refer to the second group of solutions in general, while Dynamic Braking Resistor (DBR) circuits can be considered a particular subgroup of EDC circuits in which the DC link energy is diverted to a resistive device where it is dissipated as heat.…”

Section: Introductionmentioning

confidence: 99%

Energy diverting converter topologies for HVDC transmission systems

Maneiro

Tennakoon

Barker

et al. 2013

2013 15th European Conference on Power Electronics and Applications (EPE)

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Grid codes imposed by utilities regulate the operation of Voltage Source Converter -High Voltage Direct Current (VSC-HVDC) interconnected offshore wind farms. Fault ride-through (FRT) specifications require the adoption of specific measures to avoid over-voltages of the HVDC link during faults in order to protect the HVDC equipment. Implementing Energy Diverting Converters (EDC), for instance Dynamic Braking Resistor (DBR) circuits, at the DC link is an established method to comply with the grid codes, where the excess energy of the wind farm is diverted into the parallel circuit during the fault. In this paper an evaluation of three different state-of-the-art DBR circuits is performed in order to establish the advantages and disadvantages of each circuit. The evaluation has shown that although the three solutions meet the FRT requirements, the modular topologies generate reduced slope current and voltage step changes during their operation, while being larger in size and requiring a higher number of semiconductors as compared to the traditional DC chopper circuit employing hard switched series connected semiconductor arrangements.

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Improvement of stability assessment of VSCHVDC transmission systems

Cited by 5 publications

References 1 publication

Battery Power Control Strategy for Intermittent Renewable Energy Integrated Modular Multilevel Converter-Based High-Voltage Direct Current Network

Battery Power Control Strategy for Intermittent Renewable Energy Integrated Modular Multilevel Converter-Based High-Voltage Direct Current Network

Fault Ride Through and Intermittency Improvement of Renewable Energy Integrated MMC-HVDC System Employing Flywheel Energy Storage

Energy diverting converter topologies for HVDC transmission systems

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