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3292results about "Dynamo-electric machine testing" patented technology

Movable low-voltage ride-through testing device for wind generating set

InactiveCN102129036AMeet the requirements of low voltage ride through testChange sizeSingle network parallel feeding arrangementsWind energy generationShunt reactorElectric power system
The invention relates to a movable low-voltage ride-through testing device for a wind generating set. The device is connected between a tested wind generating set and an electric network in series, uses an impedance voltage-dividing type and a vehicle container structure, and tests the low-voltage ride-through performance of the wind generating set through analog voltage sag fault; a main connecting wire of the device consists of a serial reactor group, a parallel reactor group and a circuit breaker; the serial reactor group and the parallel reactor group both consist of at least one adjustable reactor; the impedance voltage-dividing ratio can be changed by regulating the impedance value of each adjustable reactor and/or the connecting manner of each adjustable reactor so as to change the voltage sag depth of testing points; and once recovery or a step recovery of the voltage sag can be implemented according to the system requirements. The device can complete the low-voltage ride-through testing experiments for various wind generating sets having a maximum rated capacity of 6 MW, and meet the requirements to the low-voltage ride-through testing experiment in wind electric network integrations in states in Europe and America and Technical Rule for Connecting Wind Farm to Power Networks.

Starting method for brushless DC motor without position sensor based on current feedback

The invention discloses a starting method of a brushless, position sensor- free DC motor based on current feedback. The method comprises the steps as follows: a rotor is pre-positioned; the direction changing and the current converting are carried out; a preset voltage value is calculated according to a pressure-raising curve and is output in the form of PWM; the direction changing and the current converting are carried out when detection shows that a phasing current value I exceeds a predetermined value IH, and the preset voltage value in the next step is calculated at the same time according to the pressure-raising curve; and an electric motor is switched over to closed-loop operation when the current converting frequency is greater than the predetermined value, that is, rotational speed is high enough to obtain a back-EMF signal. Based on the real-time detection on the starting current, the technical proposal of the starting method obtains better starting performance compared with a traditional three-step starting method, ensures the stability and controllability of Delta during the whole accelerating process, leads the starting current to be more stable, enables the accelerating process to be smoother, automatically reduces the rotational speed and the Delta so as to obtain greater electromagnetic torque without desynchronizing when meeting with load disturbance, and does not need to add extra hardware or timers, thereby being simpler and more reliable.
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