57results about How to "Inhibit short circuit current" patented technology

The invention discloses a flying capacitor converter and a short-circuit current suppression circuit and an energy storage system used for the flying capacitor converter. The flying capacitor converter comprises a controller, the high-voltage side of the flying capacitor converter being connected with a first power supply, the low-voltage side of the flying capacitor converter being connected with a second power supply. The short-circuit current suppression circuit comprises at least one current detection component connected to the low-voltage side and / or the high-voltage side of the flying capacitor converter; and at least a switch assembly, connected to the high-voltage side and / or the low-voltage side of the flying capacitor converter in series, and when the current detection component detects a short circuit condition, the controller controlling the switch assembly to disconnect the flying capacitor converter and the first power supply and / or the flying capacitor converter and the second power supply. According to the invention, the short-circuit current of the flying capacitor converter can be rapidly suppressed, the short-circuit capacity of the converter is reduced, and the short-circuit reliability of an energy storage system composed of a plurality of flying capacitor converters can be improved.

The invention provides a novel two-section type seven-phase permanent magnet fault-tolerant motor and belongs to the technical field of permanent-magnet synchronous motors. The motor comprises a motor shell, two rotor assemblies, two stator assemblies, a rotary shaft, a bearing, a bush, an insulating sleeve, a magnet isolating board and an end cover. The two stator assemblies and the two rotor assemblies are coaxially installed on the same shell. The two stator assemblies are a three-phase winding and a four-phase winding respectively and connected with the rotary shaft through the rotor assemblies respectively, so that a three-phase permanent magnet fault-tolerant motor section and a four-phase permanent magnet fault-tolerant motor section are formed. The magnet isolating board is installed between the two motor sections. Phase windings of the stator assemblies are in a concentrated single-layer winding mode and are embedded separately through teeth. Power is supplied to each phase winding through an independent H-bridge driving mode. The novel two-section type seven-phase permanent magnet fault-tolerant motor is good in physical isolation capacity, magnetic field isolation capacity, thermal field isolation capacity and electric isolation capacity and can effectively restrain short circuit currents of the permanent magnet motor, greatly improve the reliability of the permanent magnet motor and satisfy the requirements for primary fault work, secondary fault work and third fault safety.

The invention relates to a device for automatically restricting short circuit fault current in an alternating current power grid. The invention aims to cause the device to be under low-power loss when the device normally operates, can increase the reactance value number of an electric reactor while a circuit is subjected to short circuit, and lightens the damage degree of a short circuit fault. The device is provided with a 20-500KV alternating current bus; a power transmission feeder is successively connected with a feeder circuit breaker, a feeder current mutual inductor and two disconnecting switches; a variable reactance current limiter is connected between the two disconnecting switches of the feeder; the variable reactance current limiter comprises a main electric reactor, an air gap electric reactor, a main circuit breaker and high-resistance reactors, wherein the main electric reactor consists of an iron core body, a primary winding and a secondary winding; the primary winding is connected in the feeder in series and is a first loop; the secondary winding, the air gap electric reactor and the main circuit breaker form a second loop; the high-resistance reactors connected to two ends of the secondary winding in parallel form a third loop; and meanwhile, the feeder current mutual inductor, a secondary winding side current mutual inductor and a relay protection control system installed in a power substation form a detection control loop.