Short circuit analysis of an offshore AC network having multiple grid forming VSC-HVDC links

Raza, Muhammad Ahmed; Aragüés‐Peñalba, Mònica; Gomis‐Bellmunt, Oriol

doi:10.1016/j.ijepes.2018.05.009

Cited by 16 publications

(16 citation statements)

References 22 publications

(38 reference statements)

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“…The HVDC link voltage controller dynamics is governed by the following equation. 18and Equation (19). In addition to these equations, current and modulating voltage limiters are employed to prevent overcurrent through the transistor.…”

Section: Low Level Controlmentioning

confidence: 99%

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SCIG Based Wind Energy Integrated Multiterminal MMC-HVDC Transmission Network

Hossain

Abido

2020

Sustainability

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Modular multilevel converter (MMC) based HVDC system for renewable energy integration has attracted the researcher’s interest nowadays. This paper proposes a control strategy for MMC based multiterminal HVDC system for grid integration of squirrel cage induction generator (SCIG) based wind energy systems. Unlike the average model, this work models the MMC using the aggregate model and develops multiterminal HVDC transmission network in MATLAB/Simulink. It further develops the MMC multiterminal HVDC transmission network in real time digital simulator (RTDS). Instead of simplified current source, the proposed network considers the complete dynamics of SCIG based wind source from generation to integration. It employs field-oriented control for optimum wind energy tracking and forms isolated AC grids using feed forward controller. The proposed MMC controller performance has been tested under severe balanced and unbalanced disturbances. The results from aggregate model based MMC network in MATLAB/Simulink and those of the experimental MMC network in RTDS are in full agreement. The results confirm optimum wind energy tracking, fulfill grid code requirements, and improve low voltage ride through capability.

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Section: Low Level Controlmentioning

confidence: 99%

“…Higher voltage SM to lower voltage SM is placed if current leaves from the SM or lower voltage SM to higher voltage SM is placed if current enters to SM. 18and (19). In addition to these equations, current and modulating voltage limiters are employed to prevent overcurrent through the transistor.…”

Section: Low Level Controlmentioning

confidence: 99%

SCIG Based Wind Energy Integrated Multiterminal MMC-HVDC Transmission Network

Hossain

Abido

2020

Sustainability

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“…The voltage and frequency droop schemes are suitable in order to operate the parallel connected VSCs. The advantage of droop scheme is to have multiple slack sources in the network and the communication between VSC-HVDC transmission systems is not required for power sharing during normal operation as well as in the failure of any transmission system [8]. Furthermore, the droop gains also offer an additional degree of freedom to control the reactive power in the offshore AC network.…”

Section: Control Principle Of Offshore Gridmentioning

confidence: 99%

“…Further, the size of an offshore converter of a single HVDC transmission line is not required to be equal to the net power of the wind power plants. Though, the combined power of all offshore converters should be equal to the net wind power [8]. The network configuration shown in Figure 1(a) may produce unnecessary losses in the offshore converters and AC cables while transferring power from one country to another.…”

Section: Introductionmentioning

confidence: 99%

Active and reactive power control of hybrid offshore AC and DC grids

Raza

2019

Automatika

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The future 'SuperGrid' may requires the benefit of both offshore AC network and multi-terminal DC grid. AC cable limits the power transfer capability from the larger offshore wind farm, however, HVDC transmission system is economical viable for large power wind farm integration with the grid. Another approach to develop the offshore network infrastructure is by forming an offshore AC grid connecting several offshore wind farms. Then, this offshore AC network is connected with different onshore grid using HVDC system. This enhances the trade among the countries as well as provide an economical solution for wind energy integration. In this article, operational and control concept of voltage source converter is presented to integrate an offshore AC grid with an offshore DC grid. The article presents the control principle of offshore AC network frequency and voltage with respect to active and reactive power distribution in the AC network. Later, the principle of multi-terminal HVDC system is discussed with respect to power distribution using DC voltage droop control. Power distribution criteria are defined with respect to operator power-sharing requirement and network stability. In the end, a hybrid AC/DC offshore grid is modelled and simulated in MATLAB/SIMULINK to validate the distribution criteria. ARTICLE HISTORY

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“…These examples have the same characteristic, low impedance. Then, the short circuit level for these systems is high, increasing operation cost toe industries (Hasan et al, 2008;Raza et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Simulation of a Superconductor Fault Current Limiter with finite element method using A-V-H formulation

Santos

Martins

Santos

et al. 2020

Anais Do Simpósio Brasileiro De Sistemas Elétricos 2020

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Nowadays, the complexity of electrical power systems is increasing. Consequently, the occurrence and the amplitude of the fault current are rising. This fault currents harm the substations’ electrical equipment. Besides, the growth in the fault current level is forcing the change of the circuit breakers to others with a higher interruption capability. A proposal to solve this problem is the fault current limiter (FCL). This equipment has low impedance in the normal operation and high impedance in a short circuit moment. Superconductors are an advantageous choice of material in this case, because of their properties. In order to simulate this equipment, the 2-D Finite Element Method (FEM) has been used. In this paper, a novel FEM simulation analysis of the saturated core Superconductor Fault Current Limiter (SFCL) is proposed using the A-V-H formulation. The current distribution in the superconducting coil is observed. The results are compared to the limited fault current measurements and simulations available in the literature.

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Short circuit analysis of an offshore AC network having multiple grid forming VSC-HVDC links

Cited by 16 publications

References 22 publications

SCIG Based Wind Energy Integrated Multiterminal MMC-HVDC Transmission Network

SCIG Based Wind Energy Integrated Multiterminal MMC-HVDC Transmission Network

Active and reactive power control of hybrid offshore AC and DC grids

Simulation of a Superconductor Fault Current Limiter with finite element method using A-V-H formulation

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