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Flow chart of reactive power compensation control 4.2. Capacitor switching control sub process As shown in figure 8 (a), when power factor cosφ< cosφA and Qs>0, the compensation power needs to be increased to make cosφ rises to cosφA. The capacitor connected sub process judge whether the mutual compensation part has been put into operation, and then judge either to put in split-phase compensation part or (and) raise the capacitor voltage to make the power factor meet the requirement. As shown in figure 8 (b), when reactive power is inverted (QS<0), the compensation power needs to be reduced. The capacitor cut-off sub process judge whether to exit the mutual compensation part, and then judge either to exit capacitor of split-phase compensation part; or (and) reduce the capacitor voltage to make the power factor meet the requirement.
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A dynamic reactive power compensation device with continuously adjustable capacity is designed for low voltage power grid. According to the time requirement of reactive power dynamic compensation for capacitor switching, a signal generating circuit of voltage/current zero-crossing triggering switching is designed. A capacitor combination method to...
Context in source publication
Context 1
... the reactive power is inverted (Qs<0) after the capacitor is put into operation, the capacitor cut-off subprocess is started to reduce the compensation power; if the reactive power direction is positive (Qs>0) and the power factor exceeds the upper limit cosφB, the capacitor voltage is reduced to stabilize the power factor between cosφA and cosφB. Reactive compensation control flow is shown in figure 7. ...
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