This paper presents two novel topologies on precharge and submodule capacitor voltage balancing schemes of Modular Multilevel Converter (MMC) for VSC-HVDC application respectively. Firstly, A traditional precharge pro...
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ISBN:
(纸本)9781424462537
This paper presents two novel topologies on precharge and submodule capacitor voltage balancing schemes of Modular Multilevel Converter (MMC) for VSC-HVDC application respectively. Firstly, A traditional precharge process of MMC was modeled in PSCAD/EMTDC, its drawbacks were summarized and a novel topology was proposed based on submodules charged synchronously;Secondly, we analyzed the principles of a traditional submodule capacitor voltage balancing scheme, clarified its limitations and another novel topology based on the essential objectives of the balancing schemes was proposed. The topology is with Double DC Bus Bars, external DC voltage source and antiparallel thyristors. Detailed analysis and simulations indicated that the two topologies presented here not only can make up the drawbacks of the conventional schemes to a certain extent, but also have great potentiality in the application of VSC-HVDC projects in the future.
The method, complex torque coefficient approach, which is used to analyze the sub synchronous oscillation (SSO) problems with the help of PSCAD/EMTDC are recommended. While how to achieve the complex torque coefficien...
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Simulation accuracy has great effects on powersystem analysis and control. In this paper, in order to analyze the powersystem real-time digital simulation error, prony algorithm is used to extract the features of si...
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As a promising renewable resource, wind power is highly expected to contribute a significant part of generation in powersystems in the future, but this also brings new integration related power quality issues due to ...
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In this paper, powersystem electromagnetic and electromechanical transient hybrid real-time simulation technology is expounded in details, which has advantages of the electromagnetic transient simulation program and ...
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In order to overcome the disadvantage that there are hardly any analysis functions on alarm messages in current EMS, an Intelligent Expert system which processes all alarm messages from the regional Grid Dispatching C...
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In modern powersystem, powersystems are being interconnected into a unified system. The structure of the power grid is more and more complex, and the relation between different regional power grids is more closed. I...
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Modular multilevel converter (MMC) is a new multilevel converter suitable for VSC-HVDC. The principle of the submodules and converter topology are introduced in this paper. A novel carried phase shifted sinusoidal pul...
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ISBN:
(纸本)9781457700668
Modular multilevel converter (MMC) is a new multilevel converter suitable for VSC-HVDC. The principle of the submodules and converter topology are introduced in this paper. A novel carried phase shifted sinusoidal pulse width modulation (CPS-SPWM) scheme suitable for MMC in VSC-HVDC is presented. Voltage balancing among the submodules is a crucial problem of MMC. Based on the energy equipartition and voltage balance,a capacitor voltage-balancing strategy is presented in this paper with the topology of MMC and modulation. This scheme could effectively ensure each submodule at the same capacitor voltage level. The correctness and effectiveness of the schemes were verified by the simulation.
To avoid undesired operation of backup protection caused by load encroachment under cascading failures, the methodology for vulnerability assessment of backup protection is studied. In this paper, the vulnerability as...
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This paper presents a simple and effective approach based on two dynamic matrixes of node-relay matrix (NRM) and relay-incidence matrix (RIM) to determine minimum break point set (MBPS) for coordination of the directi...
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