Research on VSC-HVDC Based on Modular Multilevel Converter Technique

2014 ◽  
Vol 577 ◽  
pp. 588-593
Author(s):  
Si Yu Chen ◽  
Ya Lou Li ◽  
Xiao Bo Hu ◽  
Li Zhao ◽  
Chao Xi Chen
Keyword(s):  
Theoretical Model ◽  
Equivalent Circuit ◽  
Control Strategy ◽  
Traditional Method ◽  
Experimental Results ◽  
Modular Multilevel Converter ◽  
Multilevel Converter ◽  
Hvdc System ◽  
Proposed Model ◽  
Working Principle

This paper introduces the topology and working principle of modular multilevel converter, simplifying its equivalent circuit before obtaining virtual equipotential. On the ground of the theoretical model of equivalent circuit, MMC-HVDC could adapt the same control strategy as the traditional method. So, on the platform of PSCAD/EMTDC, an eleven level MMC Dual-infeed HVDC system is established and nearest level modulation is adopted as its control strategy to sort voltage sharing of the modules. Experimental results prove the validity of the proposed model.

The Research Status of Modular Multilevel Converter and its Capacitor Voltage Balancing Control

2014 ◽  
Vol 535 ◽  
pp. 153-156
Author(s):  
Ya Ai Chen ◽  
Peng Chen ◽  
Jing Hua Zhou
Keyword(s):  
Modular Multilevel Converter ◽  
Multilevel Converter ◽  
Topology Structure ◽  
Voltage Balancing ◽  
Research Status ◽  
Hvdc System ◽  
Capacitor Voltage ◽  
Working Principle ◽  
Balancing Control

The thesis mainly analyzes the topology structure and the working principle of MMC based VSC-HVDC system; introduces the characteristics and research status of its capacitor voltage balancing control. All of this will lay a foundation for the further research.

scholarly journals Stop Control Strategy of Modular Multilevel Converter Based HVDC System

2014 ◽  
Vol 02 (09) ◽  
pp. 182-190
Author(s):  
Chengjun Xia ◽  
Bingmei Jin ◽  
Junjun Liang ◽  
Meng Li
Keyword(s):  
Control Strategy ◽  
Modular Multilevel Converter ◽  
Multilevel Converter ◽  
Hvdc System

scholarly journals Research on Precharge Control Strategy of Modular Multilevel Inverter

2021 ◽  
Vol 261 ◽  
pp. 02039
Author(s):  
Chuanliang Fang ◽  
Guochu Chen
Keyword(s):  
Control Strategy ◽  
Multilevel Inverter ◽  
Modular Multilevel Converter ◽  
Simulation Environment ◽  
Multilevel Converter ◽  
Simple Analysis ◽  
Simulink Simulation ◽  
Working Principle ◽  
Simulation Results ◽  
The Mathematical Model

This paper mainly introduces the Modular Multilevel Converter (MMC) topology structure, simple analysis of the working principle of MMC, deduced the mathematical model of MMC. The precharging control strategy of MMC sub-module (SM) is studied, and the charging process is divided into uncontrollable charging stage and controllable charging stage. For the uncontrollable charging stage, an improved DC side pre-charging method is proposed, and a five-level simulation model of voltage-type MMC is established in the Matlab/Simulink simulation environment, and the simulation results of the system are comprehensively analyzed.

scholarly journals Simulation Model to Analyze the Consequences of DC Faults in MMC-Based HVDC Stations

Electricity ◽  
2021 ◽  
Vol 2 (2) ◽  
pp. 124-142
Author(s):  
Davin Guedon ◽  
Philippe Ladoux ◽  
Sébastien Sanchez ◽  
Sébastien Cornet
Keyword(s):  
Power Transmission ◽  
Renewable Energy Sources ◽  
Energy Sources ◽  
Modular Multilevel Converter ◽  
Multilevel Converter ◽  
Circuit Breakers ◽  
High Voltage Direct Current ◽  
Proposed Model ◽  
Proper Design ◽  
Reliability And Availability

The global development of high-voltage direct-current (HVDC) systems in fields such as renewable energy sources, interconnection of asynchronous grids or power transmission over great distances, is unquestionably important. Though widely used, the modular multilevel converter with half-bridge cells is sensitive to DC pole-to-pole faults and the time-response of the protections is critical. Reliability and availability are paramount: circuit-breakers must minimize the effects of any fault on the converter, while ensuring rapid restart. This paper focuses on the modelling aspects to analyse the behaviour of HVDC stations during DC pole-to-pole faults, using either AC or DC circuit-breakers, with different parameters. The proposed model can represent the main issues met by the converter cells during DC faults, such as semiconductor overcurrents and overvoltages, allowing a proper design of the cells.

scholarly journals Real Time Simulation of Wind Farm Connected MMC-HVDC System

2020 ◽  
Vol 8 (6S) ◽  
pp. 46-52
Keyword(s):  
Real Time ◽  
Wind Farm ◽  
Computing Time ◽  
Offshore Wind ◽  
Modular Multilevel Converter ◽  
Offshore Wind Farm ◽  
Multilevel Converter ◽  
Real Time Simulation ◽  
Hvdc System ◽  
Time Simulation

Real time simulators play a major role in R&D of Offshore wind farm connected modular multilevel converter (MMC)-HVDC system. These simulators are used for testing the actual prototype of controllers or protection equipment required for the system under study. Modular multilevel converter comprises of number of sub modules (SMs) like Half/ full bridge cells. While computing time domain Electromagnetic transients (EMTs) with the system having large number of SMs pose a great challenge. This computational burden will be more when simulated in real time. To overcome this, several authors proposed equivalent mathematical model of MMC. This paper proposes the real time simulation start-up of offshore wind farm connected modular multilevel converter (MMC)-HVDC system. This paper also describes about how the above said systems is simulated in OPAL-RT based Hypersim software.

scholarly journals A Simple and Novel Precharging Control Strategy for Modular Multilevel Converter

IEEE Access ◽  
2019 ◽  
Vol 7 ◽  
pp. 170500-170512 ◽  
Author(s):  
Wentao Liu ◽  
Ke-Jun Li ◽  
Zhijie Liu ◽  
Meiyan Wang
Keyword(s):  
Control Strategy ◽  
Modular Multilevel Converter ◽  
Multilevel Converter
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