| CPC H02J 3/46 (2013.01) | 11 Claims |

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1. A method for a current source to respond, comprising:
establishing parallel control for the current source and a voltage source;
acquiring a voltage across an alternating-current bus;
controlling the current source to output a current when the voltage is lower than a first threshold;
determining whether the voltage exceeds a second threshold, wherein the second threshold is greater than the first threshold;
controlling the current source to stop outputting the current, when the voltage exceeds the second threshold; and
distributing power between the current source and the voltage source after power synchronization, when the voltage does not exceed the second threshold.
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