DC Impedance Modeling of Push-Pull DC Auto-Transformer for MMC and LCC HVDC Interconnections

Zhang, Ganghua; Xiang, Wang; Han, Mingyu; Zuo, Wenping; Zhou, Meng; Wen, Jinyu

doi:10.1109/tpwrd.2023.3243887

Cited by 3 publications

(1 citation statement)

References 25 publications

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“…Moreover, it requires only one onshore AC/AC converter in terms of cost [5][6].As the core equipment of LFAC transmission systems, converters are continuously updated and iterated. The earliest frequency conversion equipment used in LFAC transmission was the thyristor phase-controlled converter, which was eliminated due to the generation of significant non-eliminable low-order harmonics and its unsuitability for high-voltage and high-capacity scenarios [7][8]. Matrix converters (MC) do not require an intermediate DC link, and their input and output currents are sinusoidal.…”

Section: Introductionmentioning

confidence: 99%

Lyapunov control strategy for low-frequency offshore wind power based on hexagonal converters

shen,

cheng

2024

Preprint

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The low-frequency transmission system (LFTS) for offshore wind power is a promising integrated solution. Hexverter, as a topology derived from the Modular Multilevel Matrix Converter (M3C), exhibits certain advantages in low-frequency transmission. However, its application in offshore wind power faces challenges due to the stochastic nature and nonlinear characteristics of renewable energy, making linear PID control less effective. In contrast, the Lyapunov control strategy has shown better performance in controlling nonlinear systems than PID control. Therefore, this paper proposes a Lyapunov control strategy for Hexverter. Firstly, the global asymptotic stability of the Lyapunov control strategy for Hexverter is analyzed. Then, based on the topology of Hexverter, the control laws for bilateral Lyapunov control of Hexverter are derived, and the parameter selection problem for Lyapunov control is discussed. Subsequently, a Lyapunov control system for Hexverter is established using Simulink and RT-LAB platforms. The operating results under various conditions are simulated, and the feasibility and effectiveness of the proposed Lyapunov control strategy are validated by comparing the simulation results with PID control.

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Section: Introductionmentioning

confidence: 99%

Lyapunov control strategy for low-frequency offshore wind power based on hexagonal converters

shen,

cheng

2024

Preprint

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Impedance Modeling and Stability Analysis of DR-MMC Based Hybrid HVDC for Offshore Wind Farm Integration

Zhang,

Xiang,

Wen

2023

IEEE Trans. Power Delivery

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An Improved Prevention Strategy Based on Fault Probability Detection for Commutation Failure in Line-Commutated Converter-Based High-Voltage Direct Current Transmission Systems

Xu,

Zou,

Liu

et al. 2024

Electronics

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Commutation failure (CF) is one of the most prevalent events in line-commutated converter-based high-voltage direct current (LCC–HVDC) systems. The frequent occurrence of CF poses a significant threat to the safe and stable operation of power grids. The commutation failure prevention control (CFPREV) is the main method to prevent the initial CF, which relies on the detection of a drop in AC voltage. However, its slow fault detection hinders the rapid response of post-fault control, thereby affecting the effectiveness of CF suppression. Therefore, this paper proposes a fast fault detection method based on Bayesian theory. This algorithm can calculate the conditional probability of each variable in a given dataset, effectively mitigating the impact of noise and errors in data to yield precise and dependable results. By processing the collected continuous data and calculating the probability of the existence of a fault point, it determines whether a fault occurs. Based on this method, an improved prevention strategy is proposed, which can effectively enhance the CF resilience of LCC–HVDC systems under AC faults. Finally, using the power systems computer-aided design (PSCAD) platform, the accuracy of the fault probability detection algorithm was verified based on actual engineering data. The effectiveness of the proposed strategy was further validated under three typical fault scenarios, leading to significant improvements: a 64.12% reduction in detection time for three-phase grounding faults, a 69.88% decrease for single line-to-ground faults, and a 36.84% improvement in phase-to-phase fault detection. Additionally, the overall performance of the strategy was thoroughly assessed through extensive simulations covering various fault cases within a selected range of typical faults. The simulations demonstrated the superiority of the proposed strategy in CF mitigation, with a significant reduction in incidents from 89 to 34 out of 150 tested scenarios. This highlights the robustness and reliability of the proposed strategy.

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DC Impedance Modeling of Push-Pull DC Auto-Transformer for MMC and LCC HVDC Interconnections

Cited by 3 publications

References 25 publications

Lyapunov control strategy for low-frequency offshore wind power based on hexagonal converters

Lyapunov control strategy for low-frequency offshore wind power based on hexagonal converters

Impedance Modeling and Stability Analysis of DR-MMC Based Hybrid HVDC for Offshore Wind Farm Integration

An Improved Prevention Strategy Based on Fault Probability Detection for Commutation Failure in Line-Commutated Converter-Based High-Voltage Direct Current Transmission Systems

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