Analysis of Deloaded Wind Power in Hybrid AC/HVDC Systems by Frequency Stability Constrained Optimal Power Flow

Kim, Sangwon

doi:10.1109/access.2023.3318598

Cited by 2 publications

(10 citation statements)

References 47 publications

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“…Nevertheless, none of the previous studies have mentioned a solution to determine the proper level of wind output curtailment considering this issue. In order to address this issue, our research group has formulated a frequency stability constrained-optimal power flow (FSC-OPF) [31]. The optimal wind output suppression ratio minimizing the fuel cost and satisfying the AC grid frequency stability constraint can be calculated.…”

Section: B Literature Reviewmentioning

confidence: 99%

“…A single-line diagram and the IEC controller of the VSC-HVDC model are shown in FIGURE 1 [31]. Modular multi-level converter (MMC) based topology with many sub-modules have been applied in recent VSC-HVDC projects.…”

Section: A Average Value Modelmentioning

confidence: 99%

“…The dynamic behaviors of an integrated AC/MMC-HVDC system can be represented by the AVM model with high accuracy and low computational burden [34], [35]. The AVM model explained in [31] is adopted.…”

Section: A Average Value Modelmentioning

confidence: 99%

“…Inertia emulation control (IEC) is adopted as the primary frequency controller in this paper. A detailed explanation of the IEC is provided in [12], [30], [31]. The IEC controller adjusts the reference of the DC grid voltage VDC_ref.…”

Section: B Primary Frequency Supportmentioning

confidence: 99%

“…The wind turbine model is described in FIGURE 2. The aggregated model with primary frequency support in [31] is simulated. The wind model has VSC converters in rotor and grid sides.…”

Section: A Wind Turbine Modelmentioning

confidence: 99%

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Optimization of Wind Power Curtailment by OPF in Hybrid AC/VSC-HVDC Systems With DC Voltage Constraints

Kim

2023

IEEE Access

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This paper proposes an optimization method for wind power output curtailment based on optimal power flow (OPF) analysis. The wind curtailment ratio is incorporated as a controllable variable in the OPF formulation. A voltage-source converter based high-voltage direct current (VSC-HVDC) system is installed in a power system model considering large-scale wind farm integration. Inertia emulation control (IEC) is implemented for the VSC-HVDC system. When a disturbance occurs, the VSC-HVDC system can participate in the AC grid frequency stabilization by supplying active power. However, the utilization of the active power in the VSC-HVDC system results in DC grid voltage fluctuation. This fluctuation can be reduced if the IEC frequency control can be replaced by wind-side frequency regulation. However, windbased frequency control requires wind output suppression to obtain the reserve capacity. This is undesirable for minimizing the fuel cost objective function. In this context, the novel point of this paper is to determine the optimal wind output curtailment considering both the fuel cost objective function and the DC voltage constraints by the OPF analysis. Considering the DC voltage reference deviation occurred by the IEC, the deviation range of the DC voltage reference is limited as an inequality constraint to prevent infeasible DC voltage fluctuations. Based on this approach, the advantage of wind output suppression can be analyzed from the DC voltage perspective. Sensitivity analysis on the DC voltage constraints, wind power plant capacity, and VSC-HVDC system capacity is performed to prove the effectiveness of the proposed method.INDEX TERMS DC voltage constraint, VSC-HVDC, optimal power flow, primary frequency support, wind power curtailment

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Section: B Literature Reviewmentioning

confidence: 99%

Section: A Average Value Modelmentioning

confidence: 99%

Section: A Average Value Modelmentioning

confidence: 99%

Section: B Primary Frequency Supportmentioning

confidence: 99%

“…The wind turbine model is described in FIGURE 2. The aggregated model with primary frequency support in [31] is simulated. The wind model has VSC converters in rotor and grid sides.…”

Section: A Wind Turbine Modelmentioning

confidence: 99%

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Optimization of Wind Power Curtailment by OPF in Hybrid AC/VSC-HVDC Systems With DC Voltage Constraints

Kim

2023

IEEE Access

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Optimal power dispatch method for wind farms considering service quality and available power

Cheng,

Wei,

Peng

et al. 2024

IET Renewable Power Gen

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This paper proposes an active and reactive power dispatch method for a wind farms (WF) considering the real‐time service quality and the available power to achieve the fair power allocation within the WF. The goal is to ensure operational safety while meeting the power demand instructions from the dispatch centre. This paper generates WF service quality metrics based on real‐time monitoring data of key components to characterize the operational stability of the wind turbines (WTs). Specifically, service quality metrics related to active/reactive power are constructed separately to improve the accuracy of service quality assessment and power dispatch. The available power is then integrated into the service quality metrics to derive active/reactive power allocation factors, considering operational safety and power margin. Active power allocation is constrained by the power demand instructions, while reactive power allocation aims to maintain the WT terminal voltage within a feasible range. The proposed method can ensure the fair power allocation within WFs to meet the requirements of equipment reliability, voltage safety, and power supply simultaneously, which can improve resource utilization and avoid the potential failure. Case studies in MATLAB/Simulink confirm the effectiveness of the proposed method.

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Analysis of Deloaded Wind Power in Hybrid AC/HVDC Systems by Frequency Stability Constrained Optimal Power Flow

Cited by 2 publications

References 47 publications

Optimization of Wind Power Curtailment by OPF in Hybrid AC/VSC-HVDC Systems With DC Voltage Constraints

Optimization of Wind Power Curtailment by OPF in Hybrid AC/VSC-HVDC Systems With DC Voltage Constraints

Optimal power dispatch method for wind farms considering service quality and available power

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