Low-cost power electronic alternating-current arc-free circuit breaking system and control method thereof
A power electronic, low-cost technology, applied in circuit devices, emergency protection circuit devices, electrical components, etc., can solve the problems of low integration and large volume, and achieve the effects of high integration, easy engineering implementation, and compact cost.
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Embodiment 1
[0034] see Figure 1-5 : a low-cost power electronic AC arc-free circuit breaker system, including a primary main circuit module and a secondary detection, control and drive module;
[0035] The primary main circuit module includes: three identical and independent current-passing branches, which are connected in series with the three-phase power line to conduct the three-phase load current; an auxiliary branch shared by the three-phase, through two mechanical switch It is connected in time-division and parallel with three current-passing branches to assist conduction current in the process of opening, closing and reclosing;
[0036] The secondary detection, control and driving module includes a detection module, a control module and a driving module, which are respectively used to detect three-phase voltage and current information, and control three identical independent current-passing branches and an auxiliary branch shared by three phases. The action sequence drives the tu...
Embodiment 2
[0049] To achieve the above purpose, see Image 6 This embodiment also provides a control method that adopts the above-mentioned low-cost power electronic AC arc-free circuit breaking system. The detection module detects in real time whether the three-phase power line corresponding to the three-phase current branch is faulty. When a phase power line fails, the following control procedures are included:
[0050] S1: Turn on the mechanical switch in the shared auxiliary branch, and connect the shared auxiliary branch in parallel with the phase with the largest current;
[0051] S2: Turn on the power semiconductor components in the auxiliary branch, and transfer the faulty phase current to the shared auxiliary branch;
[0052] S3: When the current of the current branch of the phase crosses zero, control the mechanical switch in the current branch of the phase to open;
[0053] S4: Ensure that when the mechanical switch in the current branch reaches the transient voltage distanc...
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