Discrete frequency conversion soft start method and soft starter
A discrete frequency conversion and soft start technology, applied in the field of soft start, can solve the problems that soft start methods and soft starters cannot adapt to the special environment in the mine
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[0090] Such as figure 1 As shown, the discrete frequency conversion soft start method of the present invention comprises the following steps:
[0091] Step 1. Set the sub-frequency band of the start-up process as Slope voltage soft start and f seven bands; and set sub-bands The start-up time threshold is t 1 , set the sub-band The start-up time threshold is t 2 , set the sub-band The start-up time threshold is t 3 , set the sub-band The start-up time threshold is t 4 , set the sub-band The start-up time threshold is t 5 , set the startup time threshold of ramp voltage soft start to t 6 ; Wherein, f is the frequency and the value is 50Hz;
[0092] Step 2. Determine whether the startup time has reached the sub-band The start-up time threshold t 1 , and satisfy t 1 %(0.02×13)=0; when the start time reaches the sub-band The start-up time threshold t 1 , and satisfy t 1 When %(0.02×13)=0, perform frequency division triggering by 13; otherwise, continue to j...
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