Impacts of MT-HVDC Systems on Enhancing the Power Transmission Capability

Raza, Ali; Shakeel, Armughan; Altalbe, Ali; Alassafi, Madini O.; Yasin, Abdul Rehman

doi:10.3390/app10010242

Cited by 6 publications

(5 citation statements)

References 42 publications

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“…MT-HVdc grid and control parameters given in Table 1 are used to evaluate WFRT, 2WF-1SST, and the proposed 2WF-SSRT topologies of the MT-HVdc transmission system. Proportional droop control is employed on GS-VSCs to attain dc voltage control [33][34][35]. Maximum P WF is extracted via V ac and P control on WF-VSCs [39].…”

Section: Simulation Resultsmentioning

confidence: 99%

“…The performance of MT-HVdc greatly depends on the employed control strategy, while control mainly relies on a kind of ac grid connection and the dc network topology [30]. This paper does not investigate control strategies in detail; however, operation and control of the MT-HVdc grid are discussed in our published research [33][34][35]. Accordingly, P−V ac control is deployed to regulate the ac voltages of WFs at a precise level [33].…”

Section: Mt-hvdc Transmission Systems and Necessitiesmentioning

confidence: 99%

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A Multi-Terminal HVdc Grid Topology Proposal for Offshore Wind Farms

et al. 2020

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Although various topologies of multi-terminal high voltage direct current (MT-HVdc) transmission systems are available in the literature, most of them are prone to loss of flexibility, reliability, stability, and redundancy in the events of grid contingencies. In this research, two new wind farms and substation ring topology (2WF-SSRT) are designed and proposed to address the aforementioned shortcomings. The objective of this paper is to investigate MT-HVdc grid topologies for integrating large offshore wind farms with an emphasis on power loss in the event of a dc grid fault or mainland alternating current (ac)grid abnormality. Standards and control of voltage source converter (VSC) based MT-HVdc grids are defined and discussed. High voltage dc switch-gear and dc circuit topologies are appraised based on the necessity of dc cables, HVdc circuit breakers, and extra offshore platforms. In this paper, the proposed topology is analyzed and compared with the formers for number and ratings of offshore substations, dc breakers, ultra-fast mechanical actuators, dc circuits, cost, flexibility, utilization, and redundancy of HVdc links. Coordinated operation of various topologies is assessed and compared with respect to the designed control scheme via a developed EMTDC/PSCAD simulation platform considering three fault scenarios: dc fault on transmission link connecting the wind farm to mainland power converters, dc fault within substation ring of VSC-HVdc stations, and ultimate disconnection of grid side VSC station. Results show that 2WF-SSRT is a promising topology for future MT-HVdc grids.

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Section: Simulation Resultsmentioning

confidence: 99%

Section: Mt-hvdc Transmission Systems and Necessitiesmentioning

confidence: 99%

A Multi-Terminal HVdc Grid Topology Proposal for Offshore Wind Farms

et al. 2020

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“…Figure 2 shows an DC-AC hybrid power system with n-terminal flexible DC grid 21 . In the system, each power electronic device is connected to an independent AC system.…”

Section: Model Construction and Theoretical Analysismentioning

confidence: 99%

Research on high proportion of clean energy grid-connected oscillation risk prediction technology based on CNN and trend feature analysis

Pu,

Yingnan,

Chongjuan

et al. 2023

Sci Rep

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Oscillations, commonly known as a universal, propagative, and intricate event in the new power system, often give rise to generator tripping and load shedding, not only adversely affecting the power flow limit and the power angle stability but also posing threats to the lines of defense for stability and protection. Traditionally, emphasis has been laid on post-fault oscillation management, an emergency measure to deal with the impact and damage that have already affected the power grid. As such, this paper focuses on an oscillation prediction technique to detect oscillation energy early and intervene proactively to prevent further faults. This technique effectively lessens the damage caused by impacts and disconnects to the power grid. Firstly, this paper proposes the concept of disturbance power density and establishes the correlation between disturbance energy and the time domain, thereby exploring a method for evaluating the pattern of electrical quantities before power system oscillation. Secondly, it speeds up the time it takes to detect faults by catching nuances of voltage-current phase angle and impedance. Lastly, it puts forward a technique to cope with the intricacy and variety of power grid equipment using the convolutional neural network (CNN). This technique incorporates an integrated attention mechanism within a one-dimensional CNN model to capture the implicit mapping between voltage, active power, and reactive power at any time in the power system. This enables the model to self-learn multi-device characteristics and enhances the possibility of using theory in practical ways. Moreover, practical case studies also show that the prediction technique proposed in this paper can effectively issue warnings eight minutes before the occurrence of oscillation.

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“…Many authors have proposed several control methods and studies for multi-terminal (MT) HVDC systems. In [18], the power transfer capacity on MT-HVDC systems was studied as well as their small-signal analysis of under-damped oscillations in the inter-area modes. In [19], an active power-sharing in large-scale MT-HVDC systems was presented to improve droop-based control and thus, reinforce the stability of the DC systems based on droop parameters.…”

Section: Review Of the State-of-the-artmentioning

confidence: 99%

Global Optimal Stabilization of MT-HVDC Systems: Inverse Optimal Control Approach

et al. 2021

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The stabilization problem of multi-terminal high-voltage direct current (MT-HVDC) systems feeding constant power loads is addressed in this paper using an inverse optimal control (IOC). A hierarchical control structure using a convex optimization model in the secondary control stage and the IOC in the primary control stage is proposed to determine the set of references that allows the stabilization of the network under load variations. The main advantage of the IOC is that this control method ensures the closed-loop stability of the whole MT-HVDC system using a control Lyapunov function to determine the optimal control law. Numerical results in a reduced version of the CIGRE MT-HVDC system show the effectiveness of the IOC to stabilize the system under large disturbance scenarios, such as short-circuit events and topology changes. All the simulations are carried out in the MATLAB/Simulink environment.

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Impacts of MT-HVDC Systems on Enhancing the Power Transmission Capability

Cited by 6 publications

References 42 publications

A Multi-Terminal HVdc Grid Topology Proposal for Offshore Wind Farms

A Multi-Terminal HVdc Grid Topology Proposal for Offshore Wind Farms

Research on high proportion of clean energy grid-connected oscillation risk prediction technology based on CNN and trend feature analysis

Global Optimal Stabilization of MT-HVDC Systems: Inverse Optimal Control Approach

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