Abstract: The flame-proof type switching compensation devices, such as static var generator, are growing rapidly for the improvement of underground micro-grid power quality. However, for the severe environment, the size of the switching compensator devices is limited. In this paper, in order to improving the responsible speed and compensation effect of switching compensator device, a new strategy for reference current calculation is present based on Conservative Power Theory. Through the orthogonal decomposition of the load current by the strategy, the reference current of various compensation objectives for switching compensation devices can be calculated by the current components or their combinations. It is demonstrated that this strategy can be used for various goals of flame-proof type switching compensation devices. The validity of the developed strategy is verified by the simulation results.