Multi-Terminal HVDC System With Offshore Wind Farms Under Anomalous Conditions: Stability Assessment

Abu-Elanien, Ahmed E. B.; Abdel‐Khalik, Ayman S.; Massoud, Ahmed M.

doi:10.1109/access.2021.3092696

Cited by 6 publications

(6 citation statements)

References 35 publications

(73 reference statements)

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“…The characteristics were analyzed based on the variations in the measurements of the system. The assessment of the MTDC system with respect to stability was reported in [43]. This work investigates the effect of voltage stability and factors influencing the potential efficacy of the system.…”

Section: Review Of Previous Workmentioning

confidence: 99%

Neuro-Fuzzy Based High-Voltage DC Model to Optimize Frequency Stability of an Offshore Wind Farm

et al. 2023

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Lack of synchronization between high voltage DC systems linking offshore wind farms and the onshore grid is a natural consequence owing to the stochastic nature of wind energy. The poor synchronization results in increased system disturbances, grid contingencies, power loss, and frequency instability. Emphasizing frequency stability analysis, this research investigates a dynamic coordination control technique for a Double Fed Induction Generator (DFIG) consisting of OWFs integrated with a hybrid multi-terminal HVDC (MTDC) system. Line commutated converters (LCC) and voltage source converters (VSC) are used in the suggested control method in order to ensure frequency stability. The adaptive neuro-fuzzy inference approach is used to accurately predict wind speed in order to further improve frequency stability. The proposed HVDC system can integrate multiple distributed OWFs with the onshore grid system, and the control strategy is designed based on this concept. In order to ensure the transient stability of the HVDC system, the DFIG-based OWF is regulated by a rotor side controller (RSC) and a grid side controller (GSC) at the grid side using a STATCOM. The devised HVDC (MTDC) is simulated in MATLAB/SIMULINK, and the performance is evaluated in terms of different parameters, such as frequency, wind power, rotor and stator side current, torque, speed, and power. Experimental results are compared to a conventional optimal power flow (OPF) model to validate the performance.

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Section: Review Of Previous Workmentioning

confidence: 99%

Neuro-Fuzzy Based High-Voltage DC Model to Optimize Frequency Stability of an Offshore Wind Farm

et al. 2023

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“…The inner current controller is implemented based on a dynamic model of the system in the d-q frame, which is expressed by: where R and L refer to resistance and inductance of the phase reactor, and ω is the angular frequency measured by the phase-locked loop (PLL). The active and reactive power through decoupled current control is obtained by: Synchronizing the d-axis with the AC voltage phase by the PLL makes V q = 0 and thus simplifies (2). Therefore, active and reactive power can be controlled independently with proper set-points of the d-axis current reference ( I * d ) and the q-axis current reference ( I * q ).…”

Section: Control Of Vsc-mtdc Systemmentioning

confidence: 99%

“…Renewable energy sources (RESs), and particularly offshore wind farms (OWFs), have started to play a principal role in power systems [1][2][3][4]. Accordingly, multi-terminal HVDC (MTDC) systems have been introduced to exchange power between adjacent AC systems and eliminate capacitive current in power transmission from OWFs [5].…”

Section: Introductionmentioning

confidence: 99%

A novel control strategy based on a look-up table for optimal operation of MTDC systems in post-contingency conditions

Alavi

Ghazi

2022

Prot Control Mod Power Syst

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Multi terminal VSC-HVDC systems are a promising solution to the problem of connecting offshore wind farms to AC grids. Optimal power sharing and appropriate control of DC-link voltages are essential and must be maintained during the operation of VSC-MTDC systems, particularly in post-contingency conditions. The traditional droop control methods cannot satisfy these requirements, and accordingly, this paper proposes a novel centralized control strategy based on a look-up table to ensure optimal power sharing and minimum DC voltage deviation immediately during post-contingency conditions by considering converter limits. It also reduces destructive effects (e.g., frequency deviation) on onshore AC grids and guarantees the stable operation of the entire MTDC system. The proposed look-up table is an array of data that relates operating conditions to optimal droop coefficients and is determined according to N-1 contingency analysis and a linearized system model. Stability constraints and contingencies such as wind power changes, converter outage, and DC line disconnection are considered in its formation procedure. Simulations performed on a 4-terminal VSC-MTDC system in the MATLAB-Simulink environment validate the effectiveness and superiority of the proposed control strategy.

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“…In the following study, the single-core cable system is designed in the software with proper parameters defined as in Table 1. The layouts of three-phase singlecore cables are set as three-phase cable plane layout and trilobal symmetrical layout (Abu-Elanien et al, 2021;. The cross-sections of the two layout schemes are shown in Figure 5.…”

Section: Modelling Of Submarine Cablesmentioning

confidence: 99%

Active Cable Sheath Current-Based Protection Scheme for an Offshore HVAC Wind Transmission System

Zhao

Liu²,

Xiao³

et al. 2022

Front. Energy Res.

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Due to the complex sending terminal structure of offshore wind transmission systems, conventional on-line monitoring-based protection cannot work well. The electromagnetic transient faults are also difficult to locate due to a short time span with fast characteristics that are affected by various power electronic devices and control algorithms. To solve the aforementioned problems, a new offshore wind transmission line protection scheme based on active detection of submarine cable sheath current is proposed. This method uses a normalized coding cooperation to realize the risk levels and failure locations of the transient defects, and then the sheath currents become a characteristic input data source, which can build a clear system protection boundary. Case studies using MATLAB and ATP simulations are carried out, where three types of transient faults represented by sheath currents are studied, i.e., loss of electrical continuity of grounding device, short circuit of segmented metal sheath of cable joint, and water immersion of junction box. Testing results illustrated that the proposed method could achieve fast fault detection and precise fault location of the electromagnetic transients. Moreover, compared with conventional wind farm protection techniques, it only needs to add few signal injection modules with high sampling frequency into the submarine optical fibers.

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Multi-Terminal HVDC System With Offshore Wind Farms Under Anomalous Conditions: Stability Assessment

Cited by 6 publications

References 35 publications

Neuro-Fuzzy Based High-Voltage DC Model to Optimize Frequency Stability of an Offshore Wind Farm

Neuro-Fuzzy Based High-Voltage DC Model to Optimize Frequency Stability of an Offshore Wind Farm

A novel control strategy based on a look-up table for optimal operation of MTDC systems in post-contingency conditions

Active Cable Sheath Current-Based Protection Scheme for an Offshore HVAC Wind Transmission System

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