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IMC based circulating current controller for MMC-HVDC
2017 36th Chinese Control Conference (CCC), 2017The working performance of modular multilevel converters (MMC) is directly affected by the circulating current. This paper presents a circulating current suppressing technique based on internal model control (IMC) applied in conventional NLM modulation scheme and double loop upper control hierarchy. According to the instantaneous energy balance between
Xianzheng Liu +3 more
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Modeling and Simulation of MMC-HVDC Energy System
Advanced Materials Research, 2014In order to study the steady-state performance of modular multilevel voltage source converter (MMC-HVDC), a 21-level MMC-HVDC system is modeled by PSCAD/EMTDC software. This system uses the DC voltage and active power controls, which are designed by the fundamental operation principles and mathematical models of MMC-HVDC.
Guang Hao Yang +3 more
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Arm Overcurrent Protection and Coordination in MMC-HVDC
2018 IEEE Power & Energy Society General Meeting (PESGM), 2018This paper discusses the coordination of arm overcurrent protective functions, which are configured both in valve controls and DC protections of modular multilevel converter based HVDC (MMC-HVDC). Since the parameter mismatching in valve control and DC protection may lead to unexpected block, the ac protection coordination diagram is used to analyze ...
Qingrui Tu +6 more
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Parameter Designing of DC Reactor for MMC-HVDC
12th IET International Conference on AC and DC Power Transmission (ACDC 2016), 2016A method to Design the DC reactor is proposed for modular multilevel converter based high voltage direct current(MMCHVDC). Firstly, the maximal current value allowed in an arm was acquired base on the parameters of the valve. Secondly, the maximal value of fault current when a DC pole-to-pole fault was happening was calculated.
Zheng Xin Zheng Xin +5 more
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Modeling of MMC-HVDC for grid integration applications
2017 IEEE Southern Power Electronics Conference (SPEC), 2017The large number of constitutive elements of modular multilevel converters requires a complex model for control and modulation simulation which usually requires a small step time in the range of microseconds. However, to study the interaction of the MMC-HVDC station with the electrical DC and AC systems, which dynamical response is in the range of ...
Alvaro Carreno +2 more
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Circulating Current Suppression for MMC-HVDC under Unbalanced Grid Conditions
IEEE Transactions on Industry Applications, 2016Modular multilevel converter (MMC) is believed the most competitive solution for high-voltage direct current (HVDC) transmission using voltage source converters. Circulating current suppressing strategies based on proportional resonant (PR) controllers are widely used in MMC. This kind of strategies can effectively eliminate all the circulating current
null Jinyu Wang +3 more
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Detailed and Averaged Models for a 401-Level MMC–HVDC System
IEEE Transactions on Power Delivery, 2012Summary form only given. Voltage Source Converter (VSC) technologies present a bright opportunity in a variety of fields within the power system industry. New Modular Multilevel Converters (MMCs) are expected to supersede two- and three-level VSC-based technologies for HVDC applications due to their recognized advantages in terms of scalability ...
Jaime Peralta +4 more
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Low voltage fault ride through control in MMC-HVDC
2017 IEEE 26th International Symposium on Industrial Electronics (ISIE), 2017Modular multilevel converters (MMCs) are the latest converter topology for the high voltage high power applications like the high voltage dc (HVDC) transmission. This paper presents the response of an MMC-HVDC converter during grid faults. Recent grid code requirements specify reactive current injection during low voltage fault conditions and negative ...
Sanjay Chaudhary +3 more
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System stability analysis of Xiamen bipolar MMC-HVDC project
12th IET International Conference on AC and DC Power Transmission (ACDC 2016), 2016This paper presents the controller hardware-in-loop (CHIL) testing of Xiamen bipolar MMC-HVdc project based on Real Time Digital Simulator (RTDS). It revealed the system instability of MMC-HVdc converter and its controllers for the first time. The CHIL tests show that, the small signal stability of Xiamen bipolar MMC-HVdc project is related to the ...
Hui Ding Hui Ding +4 more
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