A Hybrid Modular DC/DC Converter for HVDC Applications

Li, Binbin; Zhao, Xiaodong; Zhang, Shuxin; Fu, Qintian; Wang, Shengbo; Xu, Dianguo

doi:10.1109/tpel.2019.2933288

Cited by 9 publications

(4 citation statements)

References 22 publications

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“…Each phase comprises a capacitor energy storage bridge arm and four sets switching valves ( 1 T j , 2 T j , 3 T j , 4 T j ). The capacitor energy storage bridge arm is co posed of several half-bridge submodules (HBSMs) and a bridge arm inductor CET L co nected in series [26,27]. Additionally, a DC energy dissipating device is installed on t low-voltage side, consisting of switches, f S R , and dissipative resistors, f R .…”

Section: The Novel Offshore Wind Power All-dc System With Fault Isola...mentioning

confidence: 99%

Design of Series-Connected Novel Large-Scale Offshore Wind Power All-DC System with Fault Blocking Capability

Ru,

Wang,

2024

Electronics

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The utilization of wind power all-DC systems with DC collection and transmission is an effective solution for the extensive development of wind power in deep-sea areas. However, in the event of faults occurring in wind power all-DC systems, the fault propagation speed is extremely rapid, with a wide-ranging impact, and to date, there are no complete DC engineering references available. It is crucial to research the topology and fault isolation methods applicable to large-scale offshore wind power all-DC systems in deep-sea areas. This paper proposes a novel series-connected all-DC system topology and presents corresponding fault isolation methods for internal faults in wind turbine units and faults in high-voltage DC transmission lines. The system simulation model was constructed using PSCAD/EMTDC (v4.6.3), and simulations were conducted for internal faults in the wind turbine units and DC transmission line short-circuit faults. The simulation results demonstrate that the proposed system can isolate various DC faults while maintaining stable operation, thereby validating the effectiveness of the control strategies and fault isolation methods proposed in this paper.

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Section: The Novel Offshore Wind Power All-dc System With Fault Isola...mentioning

confidence: 99%

Design of Series-Connected Novel Large-Scale Offshore Wind Power All-DC System with Fault Blocking Capability

Ru,

Wang,

2024

Electronics

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“…( 16). (16) Eq. ( 16) is the existence condition for ISM control in the HSQZSC system, which can further be classified into the following scenarios:…”

Section: Reachability and Existence Conditions Analysismentioning

confidence: 99%

“…Currently, various types of converters have been researched, including coupled inductor [7,8], switched inductor [9,10], switched capacitors [11,12], and hybrid switched inductor and capacitor [13,14]. Due to the intermittent and random nature of solar energy, not only is it necessary to improve the DC-DC boost converter, but its stable control strategy has also become a focal point of attention [15,16,17].…”

Section: Introductionmentioning

confidence: 99%

Research on HSQZSC converter with integral sliding mode control

Hou,

Zhang

2023

IEICE Electron. Express

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To address the issue of poor dynamic regulation caused by uncertainties and disturbances in the external conditions of the High step-up quasi-Z-source dc-dc boost converter (HSQZSC) control system, an integral sliding mode (ISM) controller is designed to ensure system robustness and fast response. Firstly, the operating principle of HSQZSC is analyzed to establish a mathematical model. Secondly, a sliding surface is designed using the output voltage error, inductor current error, and their integrals as state variables. Then, the conditions for stable operation of ISM are derived, and the parameter design is analyzed. Finally, by comparing with conventional control strategy using simulation and experimental platform, the results demonstrate the feasibility and effectiveness of the designed ISM control strategy.

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“…Practical circuit design for CLMMCs has been analyzed and the filters of passive and active choices also discussed [37]. The CLMMCs gives a large reduction in the total number of sub-modules (SMs) compared to the FFMMCs with clear advantages in overall cost, conversion efficiency and system footprint [38].…”

mentioning

confidence: 99%

Analysis and Investigation of Internal AC Frequency to Minimize AC Current Magnitude and Reactive Power Circulation in Chain-Link Modular Multilevel Direct DC–DC Converters

Xiang

Zhang

et al. 2020

IEEE Trans. Circuits Syst. I

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Chain-link modular multilevel direct dc-dc converters (CLMMCs) have attracted much interest recently in for dc power systems because they achieve higher device utilization, lower power losses and they are physically more compact than the alternative front-to-front modular multilevel dcac-dc converters (FFMMCs). The CLMMCs rely on circulating an internal ac current to manage energy balance of the sub-module (SM) stacks but this current inevitably contributes to extra current stresses for circuit components and can also lead to excess reactive power circulation within the converter. This paper presents a circuit analysis that there exists a frequency value for the internal ac components that may minimize the current stresses and avoid excessive reactive power circulation. For illustration, the circuit analysis is applied to one of the base formats, the buckboost CLMMC as an example. The key relationship between the CLMMC and the standard dc-ac modular multilevel converter is explored and established. The equivalent circuits for their dc and ac components with consideration of SM capacitance and SM voltage ripples are created and analyzed in detail, and a full derivation is provided for the specific ac frequency. From this example, this analytical method is extended and applied to other base formats of CLMMCs. The theoretical analysis and results are verified by a set of full-scale simulation examples and down-scaled experiments on a laboratory prototype.

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A Hybrid Modular DC/DC Converter for HVDC Applications

Cited by 9 publications

References 22 publications

Design of Series-Connected Novel Large-Scale Offshore Wind Power All-DC System with Fault Blocking Capability

Design of Series-Connected Novel Large-Scale Offshore Wind Power All-DC System with Fault Blocking Capability

Research on HSQZSC converter with integral sliding mode control

Analysis and Investigation of Internal AC Frequency to Minimize AC Current Magnitude and Reactive Power Circulation in Chain-Link Modular Multilevel Direct DC–DC Converters

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