Abstract
Several types of high voltage direct current (HVDC) breakers have been introduced and commercialized. Each of them has advantages and disadvantages. Among them, the hybrid HVDC breaker is highly successful. One of the most important concerns that the hybrid HVDC breaker has faced is high power loss throughout its fault current breaking process. The hybrid HVDC breaker comprises a high voltage bidirectional main HVDC breaker. A significant number of electronic switches need to be connected in a series where anti-parallel diodes are essentially embraced. During fault inception, a number of series solid-state switches and a number of series diodes dramatically increase the power loss of the main breaker. This study, firstly, studies the power loss of the hybrid HVDC breaker and later develops a structure of a full-bridge hybrid breaker (FBHB) to reduce the losses of the current structure both in the normal and fault protection states. In this paper simulations are done based on PSCAD. In addition to the analytical study and simulations, we show that the developed structure substantially decreases the amount of power lost during the normal operation and fault current breaking stage.
Highlights
A high voltage direct current (HVDC) system is a prominent solution for the integration of the energy source of offshore wind farms to the alternative current (AC) grid [1]
There are several structures that have been presented in recent research to enhance the performance of the hybrid breaker such as a controllable reactor-based breaker [12], an L-C-type DC breaker [13] and a parallel-bridge HVDC breaker [14]
The HVDC fault current is fed by the discharging current of the DC line capacitor and the injected current of the voltage source converter (VSC) that is provided by the AC
Summary
A high voltage direct current (HVDC) system is a prominent solution for the integration of the energy source of offshore wind farms to the alternative current (AC) grid [1]. Small conductive power losses of the hybrid breaker are because of using the solid-state low voltage switch [9]. A superconductive fault current limiter (FCL) [17,18] influences hybrid breaker operation as well as inductive. A fault current limiter has been used to enrich solid-state breakers [21,22,23]. A few other types of DC hybrid breakers issue can reach by fault current limiters. The topology of the circuit breakers were a mechanical and solid-state-based electronic switches. In the Zhangbei there were several topologies such as hybrid direct current circuit breaker (DCCB) with. A bridge structure of a hybrid breaker (BHB) is presented and its power. Section presents the topology faults and describes the details of the hybrid breaker.
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