Hierarchical Control Implementation for Meshed AC/Multi-Terminal DC Grids With Offshore Windfarms Integration

Chachar, Faheem Akhtar; Bukhari, Syed Sabir Hussain; Mangi, Fareed Hussain; Macpherson, D. E.; Harrison, Gareth; Bukhsh, Waqquas; Ro, Jong‐Suk

doi:10.1109/access.2019.2944718

Cited by 13 publications

(12 citation statements)

References 39 publications

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“…During the normal operation, the PV system controls the active power based on the voltage at the DC-link (since the active power generation from the solar-PV system increases the DC-link voltage), and the reactive power reference is defined by the reactive power support criteria [82]. It is important to note that the nominal power of the inverter must be updated to avoid overcurrent, by obtaining the modified nominal power (MNP) as given in (13) [110]. During the fault, the solar-PV system starts to inject the reactive power from the converter, according to the specifications stipulated in the grid-code of each country [91].…”

Section: Frt Strategies Of Solar-pv Systemsmentioning

confidence: 99%

“…Furthermore, with the large-scale integration of PEC-interfaced renewable power generating plants, power networks are undergoing significant structural changes. More specifically, high voltage direct current (HVDC) links are constructed to transmit power generated from remotely sited wind and solar-PV plants to the AC network [12,13]. These structural changes have evolved into hybrid AC/DC power grids, hence stability of the emerging hybrid AC/DC power grids is an important aspect in regards to future power grids [14].…”

Section: Introductionmentioning

confidence: 99%

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Power System Stability with Power-Electronic Converter Interfaced Renewable Power Generation: Present Issues and Future Trends

et al. 2020

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The energy sector is currently undergoing a rapid transformation with the integration of power electronic converter (PEC)-interfaced renewable energy sources (RES), such as wind and solar photovoltaic (PV) systems, at both the transmission and distribution networks. Power system stability has been significantly influenced by this power grid transformation. This paper comprehensively reviews major power system stability issues affected due to large-scale integration of PEC-interfaced RES in power grids, with some example case studies relevant for each stability category. According to the review, stability issues are mainly originating from reduction in synchronous inertia, reduction in reactive power reserve, low short-circuit strength of the power network, and fault ride-through (FRT) strategy/capability of the PEC-interfaced RES. Decrease in synchronous inertia could affect both the rotor angle stability and the frequency stability, while decrease in short-circuit strength and reactive power reserve could cause voltage stability and rotor angle stability issues in power networks. Sub-synchronous control interactions are also receiving a lot of attention by the power industry due to increasing oscillatory stability incidents reported in power networks with PEC-interfaced RES. FRT capabilities/strategies of PEC-interfaced RES are also playing a pivotal role in power grid stability due to its influence on active and reactive power, hence more emphasis should be placed on FRT schemes of PEC-interfaced RES, since future power grids are expected to operate with 100% PEC-interfaced generation sources. Stability improvement strategies could be implemented to address multiple stability issues in PEC-interfaced power networks; however, rigorous stability studies are required to identify the optimal conditions to implement these improvement strategies. Furthermore, ongoing structural changes in power grids to accommodate remotely sited PEC-interfaced RES are also influencing the stability of power grids. Therefore, all these factors must be carefully considered by system operators when planning and operating power grids in a secure and stable manner with high penetration levels of PEC-interfaced RES.

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Section: Frt Strategies Of Solar-pv Systemsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Power System Stability with Power-Electronic Converter Interfaced Renewable Power Generation: Present Issues and Future Trends

et al. 2020

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“…Additionally, the stator voltage in two-dimensions in the αβ stationary reference frame [49], [50] is presented in 7, as follows:…”

Section: A Mathematical Model Of Two-level Voltage Source Inverter (mentioning

confidence: 99%

Integral Super Twisting Sliding Mode Based Sensorless Predictive Torque Control of Induction Motor

et al. 2020

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In the direct torque control (DTC) of induction motor (IM) drive systems utilizing model predictive torque control (MPTC) in the inner loop and classical proportional integral (PI) control in the outer loop is prone to weaknesses, such as uncertainties, external disturbances, parameter variations, and nonlinear dynamics. A high-performance control system for speed and torque is required to guarantee a smooth and robust control architecture that can withstand such unpredictable effects. In this study, we propose an integral super twisting sliding mode control (ISTSMC) to address the shortcomings of the classical PI used in the outer loop of DTC drive systems. A sliding mode speed observer is also designed and utilized to overcome problems associated with mechanical sensors. The robustness of the proposed control strategy and fast dynamic speed response are compared favorably with a benchmark PI controller and conventional sliding mode control (SMC). The ability of the proposed system to regulate both speed and torque was evaluated through simulations, under various fault perturbations, parameter variations, and load disturbances, conducted in MATLAB/ Simulink. Various performance indices were used to demonstrate the superior performance of the proposed strategy compared to a benchmark PI system and conventional SMC-based MPTC approaches.

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“…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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Hierarchical Control Implementation for Meshed AC/Multi-Terminal DC Grids With Offshore Windfarms Integration

Cited by 13 publications

References 39 publications

Power System Stability with Power-Electronic Converter Interfaced Renewable Power Generation: Present Issues and Future Trends

Power System Stability with Power-Electronic Converter Interfaced Renewable Power Generation: Present Issues and Future Trends

Integral Super Twisting Sliding Mode Based Sensorless Predictive Torque Control of Induction Motor

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

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