Variable-speed constant-frequency pumped storage unit frequency control and power response performance improvement method

Abstract

The invention discloses a variable-speed constant-frequency pumped storage unit frequency control and power response performance improvement method. The method comprises the following steps of S1, obtaining mechanical torque Tm according to a unit speed regulation system control strategy; S2, acquiring excitation voltage Efd according to a flux linkage constant control strategy; S3, under the control state of the excitation voltage Efd, sending the mechanical torque Tm to a generator, and obtaining electromagnetic power; S4, calculating according to a unit rotor kinetic energy release controlstrategy to obtain a unit rotating speed variation delta fr required by rotor kinetic energy release; and S5, sending the electromagnetic power and the unit rotating speed variation delta fr into a rectifier and an inverter to obtain adjusted unit frequency, and merging the adjusted unit frequency into a power grid. The millisecond-level control capability of the frequency converter is utilized torealize rapid control of the frequency of the unit; kinetic energy stored in a generator rotor is released by reducing the rotating speed of the unit in the unit power regulation transient process, meanwhile, excitation control is matched, so that the unit does not enter magnetic saturation, frequency fluctuation is further restrained, and unit power regulation is accelerated.

Description

technical field [0001] The invention belongs to the technical field of operation regulation of a variable-speed constant-frequency pumped-storage unit, and specifically relates to a method for frequency control and power response performance improvement of a variable-speed constant-frequency pumped-storage unit. Background technique [0002] The variable-speed constant-frequency pumped storage unit using IGBT-based full-power power electronic converters is currently a blank in domestic technology, and there are no mature equipment and products, and there are few related theoretical studies. [0003] The new generation of variable-speed constant-frequency pumped-storage units based on full-power power electronic converters basically consists of two parts: a variable-speed pump-turbine is used on the generator side, and an IGBT-based frequency converter is used on the grid side. Affected by the inertia of the hydraulic system and the mechanical system, the power response time ...

AI Technical Summary

Problems solved by technology

[0004] The inverter adjusts the unit frequency, and the unit speed control system adjusts the power mode. Due to the fast adjustment characteristics of the inverter, the frequency adjustment performance of the unit is good, but the unit frequency may still fluctuate greatly; due to the water hammer effect of the turbine, the unit power In the early stage of adjustment, there will be obvious reverse adjustment phenomenon, and the power adjustment is very slow, which is difficult to meet the needs of pumped storage units to provide faster power support in some scenarios

[0005] However, the full-power variable-speed constant-frequency pumped storage unit is in a technical blank, and there are few related researches, which brings great challenges to the operation and control of the unit and the improvement of power regulation performance.

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