A High Voltage DC Power Flow Controller

Abstract

The invention relates to a high-voltage DC power flow controller, which includes two sets of modular multilevel converters; the two sets of modular multilevel converters are connected in series, one end of which is respectively connected to the positive pole and negative pole of the DC power grid, and the other end is interconnected Grounded to form a neutral point; the technical solution of the present invention does not need to be connected to an external power supply, has a simple structure, strong fault handling capabilities, and high operating efficiency.

Description

Technical field: [0001] The invention relates to the technical field of direct current transmission power electronics, and more specifically relates to a high-voltage direct current flow controller. Background technique: [0002] With the gradual intensification of traditional energy shortages and environmental pressures, people have realized the urgency and importance of transitioning from traditional energy to clean energy. In recent years, new energy power generation technologies represented by wind energy and solar energy have developed rapidly. However, due to the intermittency and instability of new energy, traditional technologies that accept ultra-large-scale new energy are receiving more and more attention. Therefore, new technologies, equipment and optimized grid structure must be adopted to meet the profound changes in the future energy pattern. Compared with the traditional high-voltage AC transmission technology, UHV and flexible DC transmission have the advant...

AI Technical Summary

Problems solved by technology

[0005] 1) The voltage on the input side of the power flow controller is too high, which leads to a high insulation level of the whole machine, which makes the engineering cost of the equipment too high;

[0006] 2) The DC / DC conversion unit of the power flow controller uses a cascaded topology of multi-level converters, and the efficiency of each converter will affect the overall efficiency of the whole machine, which eventually causes excessive loss of the whole machine;

[0007] 3) The DC / DC conversion unit of the power flow controller adopts the structure of bidirectional DC / DC converter cascaded H-bridge units, which makes the structure of the DC / DC conversion unit complicated, and also increases the complexity of debugging and installation

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