A control scheme for utilizing energy storage of the modular multilevel converter for power oscillation damping

Taffese, Abel A.; Tedeschi, Elisabetta; Jong, Edwin de

doi:10.1109/compel.2017.8013415

Cited by 7 publications

(19 citation statements)

References 10 publications

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“…wind gusts and tower shadowing, as studied in [8]. Possibly, these capabilities could also be used for other purposes such as power oscillation damping, improve voltage behaviour, increasing the life span of batteries by eliminating ripple or providing initial frequency response and system inertia [22]- [25].…”

Section: A the Internal Storage Contribution Of The MMCmentioning

confidence: 99%

Modeling of Multiterminal HVDC Offshore Grids with Renewable Energy and Storage Integration by Opensource Tools

Espvik

Tranulis

Sánchez

et al. 2019

2019 Offshore Energy and Storage Summit (OSES)

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With increasing offshore wind penetration levels, more secure and flexible offshore electrical transmission systems are needed to ensure security of supply to onshore users. When considering long distances of electrical power transmission, HVDC grids based on the modular multilevel converter (MMC) are a solution for present and future large scale offshore wind integration. As HVDC grids are developing into large and complex systems, dynamic analyses are useful to gain knowledge on the interactions between the different components in the grids. This paper uses the open source tool OpenModelica as modeling environment to demonstrate the potential of the tool in modeling such HVDC systems. A three-terminal HVDC system with offshore wind and energy storage integration is implemented in OpenModelica, and the dynamics of the system are investigated through four simulation cases. The main focus of this paper is dynamics and operation related to the HVDC system. The simulation results show that the MMCs can improve the most rapid power fluctuations using its internal storage capabilities, while an external energy storage system provides a more constant power flow over more extensive periods, in addition to improving the operation of the HVDC system. All models used in this paper are made publicly available to anyone for any purpose, including future studies of larger HVDC grids.

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Section: A the Internal Storage Contribution Of The MMCmentioning

confidence: 99%

Modeling of Multiterminal HVDC Offshore Grids with Renewable Energy and Storage Integration by Opensource Tools

Espvik

Tranulis

Sánchez

et al. 2019

2019 Offshore Energy and Storage Summit (OSES)

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“…where i dc is the dc line current and c dc is the equivalent dc side capacitance in per-unit. Finally, the ac current dynamics is given by (6) where ω is the fundamental frequency in rad/s and v gdq is the grid voltage at the Point of Commom Coupling (PCC) in dq domain. l ac and r ac are the equivalent ac side inductance and resistance in per-unit to the ac base values.…”

Section: B Average Arm Energy Modelmentioning

confidence: 99%

“…Energy storage capacity inherently available in the HVDC converters, particularly the Modular Multilevel Converters (MMCs), can be used to mitigate this problem. It has been shown in literature [5], [6] that sub-module capacitors in the MMC can effectively provide the required power injection for the case of POD. Such schemes can also be extended to other type of services.…”

Section: Introductionmentioning

confidence: 99%

“…Such schemes can also be extended to other type of services. There is, however, a limit on the amount power that can be obtained from the capacitors [6]. The limit is even lower for low frequency phenomenon like frequency regulation.…”

Section: Introductionmentioning

confidence: 99%

“…This paper proposes a method that distributes the responsibility of providing energy storage among all the terminals connected to the dc grid. The methods proposed in [5], [6] are suitable for local compensation using a single converter, because they assume that the measurement of the power distortion is available. This requires communication of this signal in order to extend this scheme to multiple converters.…”

Section: Introductionmentioning

confidence: 99%

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Coordination of Modular Multilevel Converter Based HVDC Terminals for Ancillary Services

Taffese

Tedeschi

2018

2018 Power Systems Computation Conference (PSCC)

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This paper deals with the utilization of the energy storage capacity, inherently present in the Modular Multilevel Converter (MMC), in providing ancillary services to ac grids. The service considered in this paper is Power Oscillation Damping (POD), which requires active power injection and hence, causes distortion (oscillation) in the dc voltage. In a multi-terminal or meshed dc grid, the oscillation is compensated by active power taken from other terminal participating in dc voltage regulation. This action leads to propagation of the oscillation into other connected ac grids, which is undesirable. This can be avoided or reduced if the power injection is taken from the arm capacitors of the MMC. Such utilization of the MMC energy storage has already been proposed in literature. However, the amount of power that can be injected from one converter is very limited. Therefore, this paper proposes a method to coordinate such a functionality among multiple MMC terminals with the aim of obtaining higher capacity to accommodate more demanding services. Furthermore, communication between the terminals is not required because local measurement of the dc voltage is used as a feedback signal.

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Power oscillation damping with virtual capacitance support from modular multilevel converters

Taffese

Endegnanew

D’Arco

et al. 2019

IET Renewable Power Generation

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Power oscillation damping (POD) is one of the ancillary services expected from high-voltage direct current (HVDC) converters. When providing POD to the ac side, converters draw power from the dc side, which can cause distortion to the dc voltage especially in the case of limited dc capacitance. In meshed/multi-terminal HVDC grids, where dc voltage regulation is distributed using a dc voltage droop control strategy, the distortion due to the POD controller action is propagated to other connected ac grids because of the droop action. This propagation can be reduced by using the inherent energy storage capability of the modular multilevel converter (MMC), which is a common converter topology for HVDC. Different methods to utilise the energy stored in the MMC for the purpose of POD have been proposed in the literature. This study presents a detailed analysis and experimental validation of one of these methods, referred to as virtual capacitance support, which increases the effective dc grid capacitance by using the stored energy of multiple MMCs connected in the same grid. The experiments, which were carried out using power hardware in the loop setup, demonstrated the effectiveness of the method.

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A control scheme for utilizing energy storage of the modular multilevel converter for power oscillation damping

Cited by 7 publications

References 10 publications

Modeling of Multiterminal HVDC Offshore Grids with Renewable Energy and Storage Integration by Opensource Tools

Modeling of Multiterminal HVDC Offshore Grids with Renewable Energy and Storage Integration by Opensource Tools

Coordination of Modular Multilevel Converter Based HVDC Terminals for Ancillary Services

Power oscillation damping with virtual capacitance support from modular multilevel converters

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