A Coordinated Marginal Current Control Method for LCC-HVDC

Xu, Jian; Lan, Tiankai; Liao, Siyang; Sun, Yang; Ke, Deping; Xiong, Liansong; Yang, Jun; Peng, Xiaotao; Sima, Li-ping

doi:10.1109/tpwrs.2019.2912865

Cited by 16 publications

(3 citation statements)

References 26 publications

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“…Under the adjustment of the controller, the DC current will rapidly decrease to the limit value, and the reactive power consumed by the sending-end converter station will also decrease. However, a large number of AC filters are still in normal operation, resulting in a large amount of reactive power being sent to the sending-end power grid, which further causes the transient over-voltage of the power grid at the sending-end [22].…”

Section: Analysis Of Ac Transient Voltage On Rectifier Sidementioning

confidence: 99%

Fault Diagnosis with Wavelet Packet Transform and Principal Component Analysis for Multi-terminal Hybrid HVDC Network

Chen

2021

Journal of Modern Power Systems and Clean Energy

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In view of the fact that the wavelet packet transform (WPT) can only weakly detect the occurrence of fault, this paper applies a fault diagnosis algorithm including wavelet packet transform and principal component analysis (PCA) to the inverter-side fault diagnosis of multi-terminal hybrid highvoltage direct current (HVDC) network, which can significantly improve the speed and accuracy of fault diagnosis. Firstly, current amplitude and current slope are used to sample the data, and the WPT is used to extract the energy spectrum of the signal. Secondly, an energy matrix is constructed, and the PCA method is used to calculate whether the squared prediction error (SPE) statistics of various signals that can reflect the degree of deviation of the measured value from the principal component model at a certain time exceed the limit to judge the occurrence of the fault. Further, its maximum value is compared to determine the fault types. Finally, based on a large number of MATLAB/Simulink simulation results, it is shown that the PCA method using the current slope as the sampled data can detect the occurrence of a ground fault with small transition resistance within 2 ms, and identify the fault types within 10 ms, without being affected by the sampling frequency. Index Terms--Fault diagnosis, hybrid high-voltage direct current (HVDC), wavelet packet transform (WPT), principal component analysis (PCA).

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Section: Analysis Of Ac Transient Voltage On Rectifier Sidementioning

confidence: 99%

Fault Diagnosis with Wavelet Packet Transform and Principal Component Analysis for Multi-terminal Hybrid HVDC Network

Chen

2021

Journal of Modern Power Systems and Clean Energy

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“…With ever‐increasing integration of large‐scale wind power plants, the high‐voltage direct current (HVDC) technology is considered the preferred solution for their long‐distance transmission [1]. Among the HVDC technologies, both line‐commutated converter (LCC) [2] and modular multilevel converter (MMC) [3] have gained attention. In order to harness the benefits of both LCC and MMC, the concept of hybrid cascaded HVDC (HC‐HVDC) technology has been introduced [4].…”

Section: Introductionmentioning

confidence: 99%

Frequency support scheme of grid‐forming based hybrid cascaded HVDC integrated wind farms

Fan,

Chi,

Wang

2024

IET Generation Trans & Dist

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The grid‐following control‐based hybrid cascaded high‐voltage direct current (HC‐HVDC) links may contribute to the worsening of inertia decline and instability issues, especially in situations characterized by a weak grid. To address the challenge, this paper proposes a grid‐forming (GFM) based optimal frequency support scheme (OFSS) for HC‐HVDC integrated wind farms. Firstly, a GFM control for hybrid converter is proposed and its stability under weak grid conditions is evaluated through a small‐signal model. Then, DC current–voltage droop control is introduced to the line commutated converter (LCC). This control approach ensures the consistency of reactive power in the LCC by regulating the DC voltage and current in the same direction, thereby mitigating AC voltage fluctuations. It also facilitates active power control in the LCC in response to grid frequency variations. Furthermore, the OFSS can convey the frequency of receiving‐end grid to the rectifier and wind farms without communication for precise power control. Finally, to validate the effectiveness of OFSS, a point‐to‐point HC‐HVDC and a 4‐machine test model are constructed on PSCAD/EMTDC. The OFSS significantly enhances the frequency support capability of HC‐HVDC links and improves the robustness in weak grid.

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“…Reference [5] proposes a coordinated marginal current control method to suppress the oscillations after fault. However, the DC current order is calculated by quasi-steady state equation of LCC-HVDC transmission systems and the mitigation of SCFs is not guaranteed.…”

Section: Introductionmentioning

confidence: 99%

DC Current Order Optimization Based Strategy for Recovery Performance Improvement of LCC-HVDC Transmission Systems

Zhou

Luo

Hong

et al. 2023

Journal of Modern Power Systems and Clean Energy

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For the safe and fast recovery of line commutated converter based high-voltage direct current (LCC-HVDC) transmission systems after faults, a DC current order optimization based strategy is proposed. Considering the constraint of electric and control quantities, the DC current order with the maximum active power transfer is calculated by Thevenin equivalent parameters (TEPs) and quasi-state equations of LCC-HVDC transmission systems. Meanwhile, to mitigate the subsequent commutation failures (SCFs) that may come with the fault recovery process, the maximum DC current order that avoids SCFs is calculated through imaginary commutation process. Finally, the minimum value of the two DC current orders is sent to the control system. Simulation results based on PSCAD/EMT-DC show that the proposed strategy mitigates SCFs effectively and exhibits good performance in recovery.

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A Coordinated Marginal Current Control Method for LCC-HVDC

Cited by 16 publications

References 26 publications

Fault Diagnosis with Wavelet Packet Transform and Principal Component Analysis for Multi-terminal Hybrid HVDC Network

Fault Diagnosis with Wavelet Packet Transform and Principal Component Analysis for Multi-terminal Hybrid HVDC Network

Frequency support scheme of grid‐forming based hybrid cascaded HVDC integrated wind farms

DC Current Order Optimization Based Strategy for Recovery Performance Improvement of LCC-HVDC Transmission Systems

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