An equivalent model for sub-synchronous oscillation analysis in direct-drive wind farms with VSC-HVDC systems

Shao, Bingbing; Zhao, Shuqiang; Gao, Bin; Yang, Yongheng; Blaabjerg, Frede

doi:10.1016/j.ijepes.2020.106498

Cited by 20 publications

(6 citation statements)

References 31 publications

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“…Reference [26] achieves model downscaling by splitting a high-dimensional matrix into small, low-dimensional matrices for computation through similar transformation of matrices, and Reference [27] uses the equilibrium truncation method to downscale the SSO model, but these two downscaling methods are extremely time consuming. When the SSO is analyzed, only the low frequency characteristics of the HVDC system are taken into account as necessary, not the high frequency characteristics.…”

Section: Simplified Model Of the Hvdc Transmission Systemmentioning

confidence: 99%

A Simplified Model of the HVDC Transmission System for Sub-Synchronous Oscillations

Wang

Chen

2023

Sustainability

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As the installed capacity of the power system is scaled up and the distance of transmission increases constantly, high-voltage direct current (HVDC) transmission technology has been widely applied across the power system. The HVDC system can lead to sub-synchronous oscillations (SSO) in the turbine and new energy generation systems. When the SSO caused by HVDC are studied through small signal analysis, it is usually necessary to establish the detailed state space model and electromagnetic transient model, which shows various disadvantages such as the high complexity of the model, the high order of the state space matrix, the complex calculation of eigenvalues, and the slow pace of simulation. In the present study, a simplified model intended for the HVDC transmission system is proposed, which can be used to simplify the calculation model and accelerate the simulation by omitting the high-frequency component and simultaneously keeping the sub-synchronous frequency component unchanged. The time domain simulation method is used to compare the dynamic response of the proposed simplified simulation model with that of the original detailed model, and the accuracy of the proposed model is demonstrated. The proposed simplified simulation model is applied to explore the SSO of wind-thermal power bundling in the HVDC transmission system. Additionally, the simulation results of SSO are compared by using the simplified model and the detailed model; the results of which demonstrate the effectiveness and rapidity of the simplified simulation model. The simplified model proposed can greatly improve the efficiency of SSO risk assessment. By selecting reasonable types and parameters of new energy units, SSO of the system can be avoided under risky operation mode, and the power grid operation mode can be monitored and adjusted to ensure the safe operation of the system. Finally, it can promote the sustainable development of the power system.

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Section: Simplified Model Of the Hvdc Transmission Systemmentioning

confidence: 99%

A Simplified Model of the HVDC Transmission System for Sub-Synchronous Oscillations

Wang

Chen

2023

Sustainability

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“…A SISO equivalent model is developed for study on high frequency oscillation of Voltage Source Converter (VSC) dominated systems [17]. Equivalent models have been presented for subsynchronous oscillation and stability analysis of wind power plants in [18]- [20]. The dynamic aggregation of VSCs has been investigated in [21]- [23].…”

Section: Nomenclaturementioning

confidence: 99%

Grid Equivalent Representation of Power Systems With Penetration of Power Electronics

Song

Cheah-Mañé

Prieto‐Araujo

et al. 2023

IEEE Trans. Power Delivery

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“…Currently, adding damping control to the original control structure is a common idea (Xu et al, 2020). Therefore, the additional damping control based on VSC-HVDC has been extensively researched, particularly in the damping interval oscillation, which has a more flexible control mode and rapid response than the traditional damping control (Huang et al, 2019a;Shao et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Rapid Power Compensation-Based VSC-HVDC Control Strategy for Low-Frequency Oscillation Suppression of the Island Power System

Abuduwayiti

Meng

et al. 2021

Front. Energy Res.

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Owing to the increased proportion of new energy power generation, such as wind power and photovoltaics, connected to the island grid, the system powered by the voltage source converter-based HVDC (VSC-HVDC) is prone to oscillate or even lose stability when disrupted. In this study, considering the rapid power compensation (RPC), an active power control strategy has been suggested for the receiving-end converter station of VSC-HVDC that could efficiently suppress the low-frequency oscillation of the island power system. First, the mechanism of VSC-HVDC inhibiting low-frequency oscillation of the island grid is analyzed in this study, and then, it theoretically determines that the damping capacity and inertia level of the rapid power compensation control strategy are stronger than those of conventional droop control and inertia control. Second, the receiving-end converter station switches from the RPC mode to droop control in order to allow the system to have a smooth recovery from the steady-state operation in the later stage of oscillation suppression. Moreover, detailed control logic and state-switching strategies have been designed. Finally, the simulation reflects that the proposed control strategy has a stronger oscillation suppression ability, allowing it to obtain rapid suppression of low-frequency oscillation.

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An equivalent model for sub-synchronous oscillation analysis in direct-drive wind farms with VSC-HVDC systems

Cited by 20 publications

References 31 publications

A Simplified Model of the HVDC Transmission System for Sub-Synchronous Oscillations

A Simplified Model of the HVDC Transmission System for Sub-Synchronous Oscillations

Grid Equivalent Representation of Power Systems With Penetration of Power Electronics

Rapid Power Compensation-Based VSC-HVDC Control Strategy for Low-Frequency Oscillation Suppression of the Island Power System

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