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Cascaded High-Voltage-Gain Bidirectional Switched-Capacitor DC–DC ...
Abstract: A family of bidirectional switched-capacitor (SC) converters with high-gain ratio of any positive integer is proposed in this paper for distributed energy resources applications. As compared with other existing SC converters achieving a same conversion gain, the main advantages of the proposed converters are that they require a …
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Research on Flexible HVDC Converter Valve and VBC …
In order to improve the redundancy of the current valve control system, firstly, this paper proposed a new redundant configuration scheme for flexible HVDC converter valve and VBC. Secondly, this paper proposed a switching logic and switching time sequence for the redundant link, in order to make all VBC board hot-swappable …
Capacitor Commutated Converters for HVDC Systems
Capacitor Commutated Converters for HVDC Systems 119 The capacitor voltage is directly proportional to the dc current the (fixed) time of conduction of the valve and …
Random vibration analysis of an offshore flexible direct …
flexible DC converter valve during marine transportation and long-term operation on the sea, this paper creates a finite element model based on the structural characteristics of the flexible DC converter valve. For the loads encountered in the above two working conditions, different acceleration power spectral densities are
A Topology and Control Method for Operational Testing of ±800 …
The paper first analyzes the voltage and current stress characteristics of capacitor components and MMC converter valves in ±800 kV/8 GW Flexible DC transmission system, providing a theoretical basis for the stress of operational testing valve, requiring that to be equivalent to actual operating conditions.
Reliable Application of Metallized Film Capacitor for Flexible …
In the flexible HVDC system, metallized film DC capacitors are widely used as energy storage element in sub-power module, and which could support the stability of DC …
Redundancy configuration strategy and condition maintenance …
The converter valve is a key equipment in the flexible DC transmission system, and in order to coordinate its reliability and economy, the redundant configuration strategy and condition maintenance arrangement of the converter valve are studied. ... we propose a redundant configuration and state overhaul strategy for flexible and straight ...
Failure mechanism of metallized film capacitors under DC field ...
1 INTRODUCTION. The metallised film capacitors (MFCs) have found extensive application in the flexible DC transmission system for voltage supporting and harmonics filtering [] pared with traditional power capacitors, the operation condition of the MFC in the flexible DC transmission system is much more stringent with the ultra …
A Flexible Reactive Power Injection Method for DC-Link Capacitors ...
The dc-link capacitor voltage drift is the key technical problem of the converters with multi-intermediate nodes. The back-to-back (BTB) configuration with voltage balancing control can achieve a certain operation range. Nevertheless, the challenge of voltage drift still remains, especially when both sides operate at high but different modulation indexes and high …
Maintenance Optimization Strategy of Modular Multilevel Converter ...
Among them, the flexible DC converter valve accounts for 25% to 30% of the total project cost. Therefore, exploring the reliability of flexible DC converters and establishing a reliability-centered maintenance plan is of great significance to the further development of flexible DC transmission.
Review of protection and fault handling for a flexible DC grid
With the development of power electronics technology, the flexible DC grid will play a significant role in promoting the transformation and reformation of the power grid. It is immune to commutation failure and has high flexibility in power control and renewable energy grid integration. However, the protection and fault handling technology for a …
Capacitor Commutated Converters for HVDC Systems
Capacitor Commutated Converters for HVDC Systems 119 The capacitor voltage is directly proportional to the dc current the (fixed) time of conduction of the valve and inversely proportional to the t size of the capacitor C i.e. Since increases with this results in an increase of the dc voltage. This is in direct contrast to the case
Non‐uniform voltage distribution characteristics of metallized film ...
The problem of non-uniform voltage distribution in the internal element of metallized film capacitors in flexible HVDC transmission systems exists, the influence of electrical parameters of dielectric and metal copper row are not considered in the existing metallized film capacitor equivalent circuit model.
R&D and application of voltage sourced converter based high …
The transmission technology has gone from DC to AC, AC to DC and then to coexist technological evolution. With the electrical and electronic technological improvement, as a new generation of DC transmission technology, flexible DC may help to solve many difficulties that the current AC/DC transmission technologies face, and …
Novel Controllable Commutated Converter (CLCC) and Rapid
The second is to optimize the DC system dynamics, including converter topology and control strategy ... In reference and, Capacitor Commutation Converter (CCC) is put forward, which can decrease CF probability through increasing the extinction angle of the converter. However, in case of serious AC fault, the uneven charging of the …
Reliable Application of Metallized Film Capacitor for Flexible HVDC Valve
In the flexible HVDC system, metallized film DC capacitors are widely used as energy storage element in sub-power module, and which could support the stability of DC voltage, and it requires the capacitor to operate stably, safely and reliably for long time. The application of metallized film capacitors in China flexible HVDC and the …
Multiple-Load–Source Integration in a Multilevel Modular Capacitor ...
A multilevel modular capacitor-clamped DC-DC converter (MMCCC) will be presented in this paper with some of its advantageous features. By virtue of the modular nature of the converter, it is possible to integrate multiple loads and sources with the converter at the same time. The modular construction of the MMCCC topology provides …
Multi-Frequency Impedance Measurement Method for DC Link Capacitor …
The DC Link capacitor is a crucial component of the sub-module in the flexible DC converter valve. Its electrical performance directly impacts the operation of the valve. Due to the complex operating conditions of the converter valve, the capacitor is susceptible to deterioration during long-term operation, leading to changes in its electrical parameters. …
Review of dc–dc converters for multi‐terminal HVDC transmission ...
1 Introduction. For many decades researchers have recognised the possibilities multi-terminal high-voltage dc (HVDC) transmission networks can offer when compared with well-established high-voltage ac systems [1-15].For the majority of this period, the difficulty of power reversal in complex multi-terminal networks based on line …
Study on Discharge Characteristics Between Damping Capacitors …
The ultra-high voltage direct current transmission technology has the advantages of large transmission capacity, long transmission distance, and low line losses [1,2,3,4], which can achieve effective consumption of clean energy and help achieve low-carbon energy transformation.The converter valve, as the "heart" of the DC transmission …
Crystallization Morphology-Dependent Breakdown Strength of ...
In this paper, a novel modification method of polypropylene (PP) films is proposed in the field of metallized film capacitors for converter valves. An organic crystallization accelerator with good dispersion improves the micromorphology of PP films. The doping content of the organic crystallization accelerator is optimized based on breakdown experiments under …
Analysis for magnetic field disturbance of modular multilevel converter ...
The standardised design and operational reliability enhancement of the flexible DC converter valve are impending with the construction of high shares of renewables and power electronics power system.