Abstract
In recent years, with the vigorous development of power electronic technology, renewable energy sources such as wind power and solar energy utilization efficiency continuing to improve, and the application scale expanding unceasingly, DC power grid technology and the development of multiterminal HVDC has become a key link of transmission technology in our country. As the key equipment of biulding DC system, The direct current breaker need to be optimized on the aspect of topology, to promote the development of dc transmission. This article puts forward a new type of submodule which can be applicated in hybrid DC breaker. After a brief review of DC circuit breaker research status, the paper will give the topology structure, and analyzes its working principle. Then, verification and electrical stress calculation will be done in Saber Sketch simulation. Based on this, two other present scheme will be introduced, and finally a comparison will be made between the diffent scheme. As is concluded, the novel submodule can save the power elctronic device cost effectively
Highlights
Large-scale renewable energy access, transportation, and consumption request interconnectino and complementary with load, energy storage, thermal power, hydropower and other energy in Internet more quickly and widely, this means that the traditional power grid structure, electric equipment and operation mode will be subject to severe challenges
In the recent double side DC transmission system, when failure occurs in certain transmission line, the protection strategy is cutting off protection switch in the converter valve, or cutting off nearby AC breaker, which will stop the entire transmission system of power transmission, so as to achieve the aim of protecting grid system
Because the FBS scheme can be equivalent to two paralelled IGBT branch, so we reduce half the IGBT device, drive and power diode in FBS module for comparison in the same performance
Summary
Large-scale renewable energy access, transportation, and consumption request interconnectino and complementary with load, energy storage, thermal power, hydropower and other energy in Internet more quickly and widely, this means that the traditional power grid structure, electric equipment and operation mode will be subject to severe challenges. In the recent double side DC transmission system, when failure occurs in certain transmission line, the protection strategy is cutting off protection switch in the converter valve, or cutting off nearby AC breaker, which will stop the entire transmission system of power transmission, so as to achieve the aim of protecting grid system. A novel high voltage hybrid DC circuit breaker topology will be proposed. This topology is based on Diode and IGBT which is called “Diode Full-bridge submodule, DFS”. The auxiliary branch can be made by many DFS in series This novel topology can maintain existing performance, and reduce the cost by 20%~30%.In the first part of paper, the structure and working principle will be introduced, and verificate the circuit breaker working process in simulation soft. In the second part of paper, two other present scheme will be introduced, and a comparison will be made between the DFS scheme, Anti-series scheme and IGBT full-bridge scheme
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