Research on Power Modulation Strategy for MMC-HVDC and LCC-HVDC in Parallel HVDC System

Zhu, Yihua; Guo, Qi; Li, Chengxiang; Chang, Dongxu; Chen, Deyang; Zhu, Yicheng

doi:10.1109/ei247390.2019.9061853

Cited by 10 publications

(3 citation statements)

References 16 publications

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“…All of these architectures are connected to transformers that are bulky and non-controllable, and can have magnetization issues and other complications [11,12]. This is where modular multilevel converters (MMC) become interesting: due to their versatility, they have a wide range of applications, such as speed drives [13][14][15], DC transmission lines [16][17][18][19], power conditioning (thanks to static compensators) [20][21][22][23] and battery energy storage systems [24,25]. Power conditioning can also be achieved with direct powering of the load to be compensated, thus MMCs can be used to power electric arc furnaces [26,27] that are particularly difficult loads to model [28,29], which makes tuning the control more difficult than for conventional loads.…”

Section: Introductionmentioning

confidence: 99%

Investigation of a 25 kV–50 Hz Railway-Substation Power Supply Based on a Back-to-Back Modular Multilevel Converter Topology

Tournoux,

Houari,

Benkhoris

et al. 2024

Energies

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This paper presents a preliminary study of a 25 kV–50 Hz railway substation power supply system. The control of a back-to-back converter based on modular multilevel converter (MMC) technology was investigated to fit with the power quality requirements of the application. One of the main challenges is the presence of constraining load conditions, under which the train circulation variability, low-frequency harmonics and critical power transients can notably decrease the power quality and lead to instability. In order to address this, cascaded controllers based on resonant controllers are proposed to ensure the desired performance. Furthermore, balancing voltage algorithms are added to avoid stress phenomena and additional losses in the studied power conversion interface. The paper presents the design of the control stages and demonstrates the robust performance of the system using a realistic loading condition of a railway substation.

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Section: Introductionmentioning

confidence: 99%

Investigation of a 25 kV–50 Hz Railway-Substation Power Supply Based on a Back-to-Back Modular Multilevel Converter Topology

Tournoux,

Houari,

Benkhoris

et al. 2024

Energies

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“…Compared with LCC-HVDC, voltage source converter-based HVDC (VSC-HVDC) has the advantages of fast and decoupled active/reactive power control [4,5]. With the wide application of VSC-HVDC, it has formed a pattern with LCC-HVDC and VSC-HVDC feeding into the same load center in some areas of China [6][7][8]. The hybrid dual-infeed HVDC system is the most basic unit to study the hybrid multi-infeed HVDC system, and the research on its operating characteristics has important practical value.…”

Section: Introductionmentioning

confidence: 99%

Power Stability Analysis and Evaluation Criteria of Dual-Infeed HVDC with LCC-HVDC and VSC-HVDC

Wu¹,

Xu²,

Zhang³

2021

Applied Sciences

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This paper analyzes the power stability of the hybrid dual-infeed high-voltage direct-current (HVDC) system containing a line commutated converter-based HVDC (LCC-HVDC) and a voltage source converter-based HVDC (VSC-HVDC). First, the concept and the calculation method of power stability for the hybrid dual-infeed HVDC system are introduced. Second, the influence of VSC-HVDC on the power stability of the system is investigated. Third, the relationship between the power stability and the effective short circuit ratio (ESCR) is discussed under different system parameters. Then, the value range of the critical effective short circuit ratio is determined. Finally, the evaluation criteria of power stability are proposed. The results show that the evaluation criteria of the single-infeed LCC-HVDC system can still be used, if the VSC-HVDC is in constant AC voltage control mode; if the VSC-HVDC is in constant reactive power control mode, the hybrid dual-infeed HVDC system cannot operate stably when the ESCR is less than 2.0 and can operate stably with high power stability margin when the ESCR is greater than 3.0. The ESCR index can still be used to measure the power stability of the hybrid dual-infeed HVDC system.

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“…HVDC, with its fast response time of control schemes and short time overload capability, can be used as a new control object to share heavy loads and alleviate overloads due to power flow transferring [17,18]. Reference [19] redefined the grid security defense system and analyzed the control functions of DC systems. In reference [20], the advantages of DC emergency control were presented regarding ensuring the safety and stability of power systems at the sending and receiving ends.…”

Section: Introductionmentioning

confidence: 99%

Optimization Method for Multiple Measures to Mitigate Line Overloads in Power Systems

Han

Wang³

2021

Energies

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Line overload is one of the important causal factors of cascading failures and blackouts in power systems. An optimization method for protection and control measures to mitigate line overloads is proposed in this study. The method consists of two main parts, i.e., the modeling process and the solving process. In the modeling process, an optimization model including overload protection and emergency control measures is developed using PFT (Power Flow Tracing). In the solving process, a multi-stage optimization method using IBSO (Improved Brain Storm Optimization algorithm) is proposed to obtain the final result. The aim of this study is to form a coordinated protection and control strategy that reduces the power on the overloaded line within the safety limits and minimizes the load loss of the power system. The simulation results show the effectiveness of the proposed method.

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Research on Power Modulation Strategy for MMC-HVDC and LCC-HVDC in Parallel HVDC System

Cited by 10 publications

References 16 publications

Investigation of a 25 kV–50 Hz Railway-Substation Power Supply Based on a Back-to-Back Modular Multilevel Converter Topology

Investigation of a 25 kV–50 Hz Railway-Substation Power Supply Based on a Back-to-Back Modular Multilevel Converter Topology

Power Stability Analysis and Evaluation Criteria of Dual-Infeed HVDC with LCC-HVDC and VSC-HVDC

Optimization Method for Multiple Measures to Mitigate Line Overloads in Power Systems

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