Abstract
A design scheme of the intelligent SSB (Solid State Breaker) based on the IGCT (Integrated Gate Commutated Thyris- tor) is presented. The topology of switch module and the structure of the SSB are proposed. Firstly, to the IGCT’s over-voltage sensitivity problem, a new technique of reducing the over-voltage is introduced, which releases the elect romantics energy of faulty line by a capacitive current branch to reduce the amplitude of over-voltage. Secondly, the principle of over-voltage suppression with current release branch is analyzed, and the overall control scheme of solid- state breaker is put forward. Finally, the simulation results also demonstrate its obvious effectiveness in over-voltage suppression after adding a current release branch into the SSB.
Highlights
With the construction of the distributed power grid of China, the requirement of the performance for the transmission equipments in power system is getting higher
The simulation results demonstrate its obvious effectiveness in over-voltage suppression after adding a current release branch into the SSB
A large number of mechanical breakers are used in the transmission system, it has the advantages of stable conduction, strong load ability, but there are not flexible, real-time, continuous and fast actions, easy to make the expansion of circuit fault and other shortcomings
Summary
With the construction of the distributed power grid of China, the requirement of the performance for the transmission equipments in power system is getting higher. When the load current is disconnected, the breaker contact is easy ablated by the electric arc, cutting time delay, so it is difficult to meet requirements of some electricity users for fast reaction speed of the fault current, there is noise in the operation process, the mechanical and electrical life limited[2,5]. Solid state circuit breaker can be used as the key equipment of the flexible AC transmission system, which can realize fast, flexible, accurate control of the power system parameters and grid structure. The breaker’s breaking time up to microseconds in short circuit situation It can limit the fault current and improve the stability of the system. The over-voltage mechanism of the SSB is analyzed, the inhibition of its Over-voltage method is adopted to increase the resistance and capacitance branches can make switching over-voltage suppression in the allowed range
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