Influence of frequency regulation of the main pumps on waves of pressure and identification of power loss on NPS

摘要

The main reason, which can lead to the violation of the technological process of pumping during short-term power failure, is the formation of waves of pressure in the pipeline. To limit the amplitude of waves of pressure has great value to manage the duration of the wave front of pressure and form when the main pumps are turned on and off. When unregulated drives are used the duration of the wave front and its shape are the values unmanageable. If frequency-regulated electric drive of pumps of the duration is used the form of the wave front pressure can be adjusted by changing the frequency of the voltage supplied to the motor. If case of the non-regulated electric drive the front shape of the pressure wave is determined by the inertial properties of the main pump and is close to the exponentially, at the frequency drive the wave front can take any form, including the form, close to linear. This article describes an algorithm frequency start of the main pump, excluding fluctuations in pressure and shock phenomena in the pipeline. Waves of pressure in the pipeline are not formed only when disconnecting the main pump, but in violation of electricity (power loss). To identify the operating regimes of power loss, and ensuring continuity of the technological mode of pumping oil at violations in electricity the protection against loss of power is used. The article examines the influence of frequency converters for currents and voltages in the modes of power loss. A new scheme of protection against loss of power, which ensures the required speed and continuity of the technological mode of pumping oil is suggested