Insulation resistance detection method, controller, direct current equipment and storage medium

The invention provides an insulation resistance detection method, a controller, direct current equipment and a storage medium. The method is applied to a detection system, the detection system is connected with a direct-current bus, and the direct-current bus is connected with a load through a feeder line. Comprising the following steps: modulating a ground electric signal of a direct-current bus into an alternating-current signal according to a preset PWM (Pulse-Width Modulation) signal so as to enable a feeder line to generate ground alternating current; and collecting an alternating current to the ground, and calculating the insulation resistance of the feeder line according to the alternating current to the ground. According to the invention, the insulation resistance of the feeder line can be accurately detected. 本申请提供一种绝缘阻抗的检测方法、控制器、直流设备及存储介质。该方法应用于检测系统，检测系统与直流母线连接，直流母线通过馈线与负载连接；包括根据预设PWM信号将直流母线的对地电信号调制成交流信号，以使馈线产生对地交流电流；采集对地交流电流，并根据对地交流电流计算馈线的绝缘阻抗。本申请能够准确检测馈线的绝缘阻抗。