Abstract: In order to effectively suppress harmonic currents, an improved active filter control technology for harmonic suppression of mining frequency conversion cables is proposed. By detecting harmonic currents in mining frequency conversion cables, an improved control algorithm is used to generate compensation current command signals from the detected harmonic current signals. The compensation current command signals are then converted into pulse signals that drive the main circuit switching devices. Based on the pulse signals, compensation currents equal in magnitude and opposite in phase to the harmonic currents are generated and injected into a hysteresis current control structure to achieve filtering control. The experimental results show that the improved active filter control technology for harmonic suppression of mining frequency conversion cables performs well in harmonic current suppression and can effectively solve the harmonic problems generated by mining frequency conversion cables.