Hybrid Energy Storage System for MVDC-Grids

Mahr, Florian; Jaeger, Johann; Henninger, Stefan K.; Rubenbauer, Hubert

doi:10.23919/epe20ecceeurope43536.2020.9215622

Cited by 2 publications

(3 citation statements)

References 13 publications

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“…The sign of 𝑃 𝑑𝑐 determines the sign of 𝑖 𝑏 . The use of a single branch does not allow to use an ac circulating current to balance the SMs as it is done in [11]. The switches 𝑆 1 , 𝑆 2 allow to insert or bypass the ES-SM, meaning that for 𝑃 𝑑𝑐 > 0, the capacitor 𝐶 𝑠𝑚 is charged with 𝑖 𝑏 or bypassed.…”

Section: Converter Topologymentioning

confidence: 99%

“…Based on this hypothesis, the system under control is an integrator (capacitive circuit), and an energy closed loop 2 nd order transfer function is obtained if a proportional integral controller is used (10). The gains of the controller can be also expressed as a function of the desired 𝜉 and 𝜔 𝑜 in (11) and (12). 𝑘 𝑝,𝑣𝑐𝑏 = 2𝜉𝜔 𝑜 (11) 𝑘 𝑖,𝑣𝑐𝑏 = 𝜔 𝑜 2 (12) Regarding the inner current control loop, the plant can be simplified into an inductive plus resistive circuit.…”

Section: Energy Regulation Of the Equivalent Capacitormentioning

confidence: 99%

“…In this solution, the possible supercapacitor voltage range is limited and then the available energy. Finally, [10], [11] present a converter made of two or more branches of series-connected energy storage submodules (ES-SMs), in which different types of storage can be integrated (supercapacitors, batteries, etc.). The ES-SMs are made of a HB or a full-bridge (FB) that is connected to the storage element via a dc/dc converter.…”

Section: Introductionmentioning

confidence: 99%

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Single branch of energy storage submodules to integrate energy storage devices in HVDC systems

Sau-Bassols

Morel

Errigo

et al. 2023

19th International Conference on AC and DC Power Transmission (ACDC 2023)

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Energy storage systems (ESS) can enhance the reliability of service in power systems with a high share of renewable energy sources. A converter topology that can integrate ESS directly into an HVDC system is presented in this work. The topology consists of a branch of energy storage submodules (ES-SMs) and an inductor. The ES-SMs are based on half-bridges, which are connected to a supercapacitor or a battery by means of a dc/dc converter. The topology is scalable to different voltage levels and since the energy storage elements are distributed among all submodules, it provides a high degree of redundancy. In this work, the converter topology is modelled using an average model and its control designed to regulate the injected dc power and the energy of the ES-SMs. A preliminary sizing of the main elements of the topology is also provided. The simulations show that the ES-SMs can both inject and absorb power from the HVDC system, while maintaining the desired energy in the ES-SMs capacitors.

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Section: Converter Topologymentioning

confidence: 99%

Section: Energy Regulation Of the Equivalent Capacitormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Single branch of energy storage submodules to integrate energy storage devices in HVDC systems

Sau-Bassols

Morel

Errigo

et al. 2023

19th International Conference on AC and DC Power Transmission (ACDC 2023)

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Design of a Single Branch of Energy Storage Submodules Connected to HVDC Systems to Support AC Grids

Errigo,

Sau-Bassols,

Bekkouri

et al. 2024

Electronics

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The number of HVDC installations is increasing and the decarbonization of power systems makes it necessary to install storage systems. It might become relevant to assess the synergies between both trends by connecting storage systems on the DC side of HVDC systems. The contribution of this paper is to show the feasibility and the design of such a system to provide three different ancillary services: power oscillation damping (POD), fast frequency response (FFR), or wind power oscillation smoothing. The DC storage system consists of a series connection of sub-modules with energy storage devices connected to each sub-module through a DC-DC converter. For the proposed design methodology, a first simple average model of the DC storage converter is developed to run preliminary EMT simulations to obtain power profiles for the energy storage elements according to the system needs. These profiles are used as inputs for designing the storage system. The design methodology is validated by performing new EMT simulations with a more detailed model which includes a model of the storage elements. Results show that the designed system can provide the expected services and sizing results confirm the technical feasibility of the solution.

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Hybrid Energy Storage System for MVDC-Grids

Cited by 2 publications

References 13 publications

Single branch of energy storage submodules to integrate energy storage devices in HVDC systems

Single branch of energy storage submodules to integrate energy storage devices in HVDC systems

Design of a Single Branch of Energy Storage Submodules Connected to HVDC Systems to Support AC Grids

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