A Coordinated Control Strategy for LCC HVDC Systems for Frequency Support with Suppression of AC Voltage Fluctuations

Lee, Gyu Sub; Kwon, Dohoon; Moon, Seung-Il; Hwang, Pyeong-Ik

doi:10.1109/tpwrs.2020.2964336

Cited by 24 publications

(9 citation statements)

References 36 publications

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“…Previous studies [11]- [13] have focused on improving the frequency stability of power system models using multi-terminal VSC-HVDC systems. The frequency regulations by offshore WPPs are investigated in [14]- [17]. Frequency support by DFIG-type wind turbines is discussed in [18].…”

Section: B Literature Reviewmentioning

confidence: 99%

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

Kim

2023

IEEE Access

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This paper investigates the relationship between the frequency support by voltage-source converter based high-voltage direct current (VSC-HVDC) systems and the deloaded wind power operation considering the frequency stability constraints. The frequency stability is incorporated as additional constraints in the optimal power flow (OPF) analysis. The reserve capacity of the wind power plants should be provided for frequency support, which requires wind power output suppression during the steady-state. On the contrary, this wind output curtailment is unnecessary if the frequency stability constraints can be satisfied by the fast frequency controller of the VSC-HVDC system. The optimal wind power deload ratio can be determined by the OPF calculation. A hybrid AC/VSC-HVDC system model is designed based on the IEEE 39-bus system. The inertia emulation control (IEC) method is applied to the slack converter for the primary frequency support. Sensitivity analysis on the frequency stability constraints, and the capacities of wind power plants and HVDC systems are carried out. It is validated that the primary frequency support of VSC-HVDC systems can reduce the wind power output suppression.INDEX TERMS Deloaded wind power, frequency stability constraint, HVDC, inertia emulation control, optimal power flow, primary frequency support

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Section: B Literature Reviewmentioning

confidence: 99%

“…The rotational behavior of the wind turbine can be represented as ( 16)- (17). The inertia constant of the wind turbine is notated in HWT.…”

Section: A Wind Power Plant Modelmentioning

confidence: 99%

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

Kim

2023

IEEE Access

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“…By substituting the power increment equations of the generator node (i.e., Equations ( 2) and ( 3)), the load node (i.e., Equation ( 5)) and the HVDC connected nodes (i.e., Equation ( 9), ( 11) and ( 12)) into Equation (15), the following correction equation can be obtained by derivation:…”

Section: Post-disturbance Steady-state Frequency Prediction Modelmentioning

confidence: 99%

An Optimal Frequency Control Method of Asynchronous Power Grid Considering Multi-HVDC Emergency Power Support

Wang

Huang

et al. 2022

IEEE Access

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Emergency DC power support has become an effective frequency stability control approach. For the asynchronous power grid with multi-HVDC links, this paper proposes an optimal control based on wide-area measurements (WAMS). The prominent advantage of this control is to improve the frequency stability of the disturbed grid while taking into account the influence on power flow, node voltage and other grid frequency fluctuations. In order to evaluate the post-disturbance frequency stability, a steady-state frequency prediction model based on WAMS data is first proposed, which can reflect the correspondence between post-disturbance steady-state frequency and the DC power support amount. In order to obtain the optimal control strategy, an optimization model is established to formulate the proposed control problem. The optimization objective of the model is to minimize the frequency deviation of interconnected power grids, and the constraints are to restore steady-state frequency to target value and ensure the security of line power flow and node voltage. The final control strategy is obtained by solving the optimization model. Simulations of the modified IEEE 50-generator system are performed to validate the accuracy of the proposed frequency prediction model and the effectiveness of the proposed frequency stability control.INDEX TERMS Asynchronous power grid with multi-HVDC links, WAMS, frequency prediction, emergency DC power support, optimal frequency control.

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“…Under the energy demand of developing large-capacity and long-distance reliable transmission channels, UHVDC transmission technology has become one of the important technical means required for China's electric power development [1][2][3] . However, LCC-HVDC uses semi-controlled device thyristor as the commutating element, which cannot realize self-shutdown, and AC failure is easy to cause commutating failure [4][5] .…”

Section: Introductionmentioning

confidence: 99%

Analysis of frequent alarms for commutation failure prevention of a ±800kV inverter station

Li,

Zhao,

et al. 2024

Eighth International Conference on Energy System, Electricity, and Power (ESEP 2023)

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After a ±800kV inverter station is put into operation, there are frequent alarms of Commutation Failure Prevention when one AC filter is put into operation. And the fault recording showed that the zero-sequence voltage fluctuated greatly. In view of this phenomenon, this paper introduces and analyzes the principle of commutation failure prevention of the inverter station. Combining with the fault recording results, it is determined that the cause of commutation failure to predict frequent action is that the calculation amount of zero-sequence voltage exceeds the action setting. Finally, it is found that the action setting is too small by comparing the calculation amount of zero-sequence voltage for several times. Therefore, reasonable optimization suggestions are given to facilitate the stable operation of the inverter station.

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A Coordinated Control Strategy for LCC HVDC Systems for Frequency Support with Suppression of AC Voltage Fluctuations

Cited by 24 publications

References 36 publications

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

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

An Optimal Frequency Control Method of Asynchronous Power Grid Considering Multi-HVDC Emergency Power Support

Analysis of frequent alarms for commutation failure prevention of a ±800kV inverter station

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