Constant head control method and control device for high pressure pool of virtual pumped storage power station

Abstract

The invention discloses a water head stabilization control strategy and control device for a high-pressure water tank of a virtual pumped storage power station. The control strategy comprises the following steps that water head signals in a high-pressure water tank (A) are monitored and are fed back to a driving device (M), if the water head in the high-pressure water tank (A)changes, the drivingdevice (M) adjusts the flow rate of water flowing into the high-pressure water tank (A) from a piston hydraulic cylinder (C) through a driving device speed regulation control strategy, so that the water head in the high-pressure water tank (A) is controlled to be stable; and the driving device speed regulation control strategy comprises a water head speed matching strategy, a pipeline flow speed equal strategy and a water head flow speed compensation strategy. According to the control strategy and control device, the purpose of controlling the water head in the high-pressure water tank to be stable is achieved, damage caused by instable water pressure to a water diversion pipe system is reduced, so that the safe operation of the hydropower station is guaranteed; and meanwhile, the impact caused by the instable water pressure on a water turbine runner blade is relieved, the service life of a water turbine is prolonged, and the power generation efficiency of the water turbine is improved.

Description

technical field [0001] The invention belongs to the technical field of electric power storage, and in particular relates to a constant water head control method and a control device for a high-pressure pool of a virtual pumped storage power station. Background technique [0002] In the process of power generation and energy storage, the instability of the water head in the high-pressure pool will cause large fluctuations in the water pressure of the water pipe system, causing the penstock to sometimes withstand excessive pressure shocks. The higher the pressure of the water shock wave, the higher the transmission The loss will also increase during the process, so when the pressure of the water shock wave is superimposed to a certain value, the pressure of the increased water shock wave is equivalent to the loss, and the pressure of the water shock wave will not continue to increase. However, the pressure generated by the superposition of the water shock wave It is very high ...

AI Technical Summary

Problems solved by technology

[0002] In the process of power generation and energy storage, the unstable water head of the high-pressure pool will cause large fluctuations in the water pressure of the water pipe system, causing the penstock to sometimes withstand excessive pressure shocks. The higher the pressure of the water shock wave, the higher the transmission The loss will also increase during the process, so when the pressure of the water shock wave is superimposed to a certain value, the pressure of the increased water shock wave is equivalent to the loss, and the pressure of the water shock wave will not continue to increase. However, the pressure generated by the superposition of the water shock wave It is very high and oscillates periodically, which will cause great damage to the diversion pipe system and seriously threaten the safe operation of the hydropower station

[0003] Due to unstable water pressure, the turbine unit is unstable and may not be connected to the grid

At the same time, the long-term instability of the water head in the high-pressure pool may also cause cracks in the runner blades of the turbine, reducing the service life of the turbine

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