2results about How to "Avoid overcurrent faults" patented technology

The invention discloses a high-voltage brushless doubly-fed motor control method, system and device, and the method comprises the steps: collecting the load current of a doubly-fed motor, reducing the active power of a stator of the doubly-fed motor if the load current exceeds a load current limit value, then reducing the active power of the stator until the load current is smaller than the load current limit value, and enabling the output of the doubly-fed motor to be normal, according to the doubly-fed motor protection method, device and system provided by the invention, when the doubly-fed motor has the overcurrent fault, the stator active power of the doubly-fed motor is adjusted, so that the stator active power of the motor is effectively reduced, the rotating speed of the motor is reduced, and finally, the purpose of protecting the motor is achieved.

The application discloses a power coordination control method of a charging system and relates to the technical field of charging piles, and comprises the following steps: S1: acquiring three-phase voltage of a power grid in real time, obtaining three-phase safe voltage of the power grid through the three-phase voltage of the power grid, acquiring a maximum allowable working current, acquiring a power factor, obtaining a maximum power limit value of a PCS through the three-phase safe voltage of the power grid, the maximum allowable working current and the power factor; when a charging gun is converted from slow charging to fast charging and proposes a power up-regulation request, whether there is a power up-regulation space is judged through a total output power and the maximum power limit value of the PCS, so that different power up-regulation strategies are formulated according to the size of the up-regulation space, which is beneficial to avoiding PCS overcurrent faults caused by uncontrollable sequences of power adjustment, and is also beneficial to improving the safety of power adjustment, so that circuit oscillation is smaller and more stable and safe.