Coupling of AC Grids via VSC-HVDC Interconnections for Oscillation Damping Based on Differential and Common Power Control

Rodríguez-Cabero, Alberto; Roldán-Pérez, Javier; Prodanović, Milan; Suul, Jon Are; D’Arco, Salvatore

doi:10.1109/tpel.2019.2952656

Cited by 14 publications

(3 citation statements)

References 32 publications

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“…The inputs P ref and Q ref , which set the active and reactive power, respectively, are usually generated by another control loop of the PC from information delivered by the Secondary control (SC) [127], [138]. The Power Source may correspond to another RES, a DC/DC converter unit, or even an AC grid with an HVDC coupling [139]. These elements are usually connected to another power electronics unit referred to as a machine-side converter.…”

Section: ) Primary Controlmentioning

confidence: 99%

Control Systems for Low-Inertia Power Grids: A Survey on Virtual Power Plants

et al. 2023

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Virtual Power Plants (VPPs) have emerged as a modern real-time energy management architecture that seeks to synergistically coordinate an aggregation of renewable and non-renewable generation systems to overcome some of the fundamental limitations of traditional power grids dominated by synchronous machines. In this survey paper, we review the different existing and emerging feedback control mechanisms and architectures used for the real-time operation of VPPs. In contrast to other works that have mostly focused on the optimal dispatch and economical aspects of VPPs in the hourly and daily time scales, in this paper we focus on the dynamic nature of the system during the faster sub-hourly time scales. The virtual (i.e., software-based) component of a VPP, combined with the power plant (i.e., physics-based) components of the power grid, make VPPs prominent examples of cyber-physical systems, where both continuous-time and discrete-time dynamics play critical roles in the stability and transient properties of the system. We elaborate on this interpretation of VPPs as hybrid dynamical systems, and we further discuss open research problems and potential research directions in feedback control systems that could contribute to the safe development and deployment of autonomous VPPs.INDEX TERMS Smart grids, renewable energy, virtual power plant, feedback control, multi-agent hybrid dynamical systems.

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Section: ) Primary Controlmentioning

confidence: 99%

Control Systems for Low-Inertia Power Grids: A Survey on Virtual Power Plants

et al. 2023

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“…This paper proposes a control scheme for multi-terminal VSC-HVDC grids that introduces a virtual electro-mechanical coupling between three ac power systems. The proposed controller is based on the general concepts introduced in [16], where two interconnected power systems are modelled by their equivalent swing equation models. The mathematical modelling and the equivalent effect of the proposed controller are derived, and the POD capability is analytically evaluated by using a simplified model.…”

Section: Introductionmentioning

confidence: 99%

Virtual Friction for Oscillation Damping and Inertia Sharing from Multi-Terminal VSC-HVDC Grids

Rodríguez-Cabero

Roldán-Pérez

Prodanović

et al. 2020

2020 IEEE Energy Conversion Congress and Exposition (ECCE)

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This paper proposes a control scheme for multiterminal HVDC (MTDC) interconnections that introduces an effect equivalent to a mechanical coupling between asynchronous ac networks providing damping of frequency oscillations and frequency support. From the control systems perspective this virtual mechanical coupling is equivalent to a mechanical friction interconnecting the ac networks (modelled as equivalent rotating masses). Also, the control system provides an inertia sharing effect. These two properties can be used to effectively damp frequency oscillations, and provide frequency and inertia support to any ac network connected simultaneously. It is shown that the controller can effectively attenuate poorly damped oscillations that are observed at the MTDC terminals. The dynamic properties of the proposed controller are analysed and its impact of the stability of the three ac networks is evaluated by using a simplified model. The controller was validated by using detailed simulations.

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“…As mentioned at the beginning, active distribution networks may become complicated hybrid AC-DC systems constructed by many power electronics in the future. Depending on the voltage level, hybrid AC-DC systems can be classified as lowvoltage (LV) AC-DC system [34], [35], MV AC-DC system [36], [37], and high-voltage (HV) AC-DC system [38], as well as hybrid AD-DC system with MV and LV interconnections [39], [40] and MV and HV interconnections via solid state power electronic transformers [41]. They come in a variety of topologies, but operate in a large similar way.…”

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confidence: 99%

Fault Current Limitation With Energy Recovery Based on Power Electronics in Hybrid AC–DC Active Distribution Networks

Zhang

Guo

Zheng

et al. 2023

IEEE Trans. Power Electron.

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The active distribution networks are becoming increasingly complicated hybrid AC-DC systems constructed by massive power electronics, the magnitude and direction of power flow may change randomly at any time, making the usual protection potentially insensitive, increasing the negative impacts of single-phase-to-ground (SPG) fault which accounts for the majority of all faults that occurred in medium-voltage (MV) distribution networks in the past. The zero-sequence current in the impedance branch induced between the lines and ground will pass through the SPG fault branch as fault current. This study transfers the zero-sequence current from the SPG fault branch to the power electronic branch connected between the faulty phase and ground involved in the construction of hybrid AC-DC system, thereby limiting SPG fault branch current and reducing fault node potential. This helps to extinguish fault arc and provides engineers with safe conditions to clear faulty elements from the SPG fault branch. The power electronic bears the same fault current and fault phase voltage as SPG fault and will therefore absorb energy in the same way as SPG fault, the energy is recovered and routed back to the hybrid AC-DC system via interconnected power electronics for reuse. The proposed is verified by simulation and experiment.

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Coupling of AC Grids via VSC-HVDC Interconnections for Oscillation Damping Based on Differential and Common Power Control

Cited by 14 publications

References 32 publications

Control Systems for Low-Inertia Power Grids: A Survey on Virtual Power Plants

Control Systems for Low-Inertia Power Grids: A Survey on Virtual Power Plants

Virtual Friction for Oscillation Damping and Inertia Sharing from Multi-Terminal VSC-HVDC Grids

Fault Current Limitation With Energy Recovery Based on Power Electronics in Hybrid AC–DC Active Distribution Networks

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