Intensive bridge type multi-port hybrid direct current circuit breaker and control method
A hybrid DC and multi-port technology, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problems of current interruption function defects, high cost, and many components in the main interruption branch circuit, and achieve good interruption characteristics and economy , The effect of reducing the number of power electronic devices and saving construction costs
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Embodiment 1
[0076] image 3 It is a topological structure diagram of an intensive bridge-type multi-port hybrid DC circuit breaker in this embodiment, refer to image 3 , the circuit breaker includes: a first DC bus, a second DC bus, a main cut-off branch, n upper flow branches, n lower flow branches and n ports, where n is not less than 2 integer.
[0077] Wherein, each of the n upper flow branches and each of the n lower flow branches is connected in series as a set of series branches, and among the n ports Each port of each port corresponds to a group of series branches and is connected to the common connection point of the upper and lower flow branches, the main cut-off branch is connected in parallel with each group of series branches, and the two parallel circuits The terminals are respectively the first DC bus and the second DC bus.
[0078] The main cut-off branch includes a plurality of cut-off units connected in series, and the cut-off unit is connected in parallel with the m...
Embodiment 2
[0090] This example is aimed at Figure 6 The installation method of the intensive bridge multi-port hybrid DC circuit breaker shown provides a control method applied to the intensive bridge multi-port hybrid DC circuit breaker, refer to Figure 6 , the circuit breaker is installed on the positive pole of the DC system, the fault F1 indicates the positive ground fault of line 1, and the fault F2 indicates the fault of the positive busbar at the outlet of converter A, and also indicates the fault of the second DC busbar in the circuit breaker. In addition, in order to clearly describe the control method when the circuit breaker works normally, it is assumed here that the protection can correctly send action signals to the circuit breaker when the line fault and the bus fault occur.
[0091] Specifically include the following steps:
[0092] 1) Normal working stage of the DC power system: block all the first auxiliary switches in the upper flow branches; turn on the mechanical ...
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