Method for detecting initial position of rotor of static frequency-conversion starting motor of pumped storage power station

Abstract

The invention relates to a method for detecting the initial position of a rotor of a static frequency-conversion starting motor of a pumped storage power station, comprising the following steps of: judging primary excitation time of the rotor through the AD sampling of the voltage of a machine end line; calculating three-phase voltage in a static coordinate after the primary excitation time of the rotor is discovered; calculating the magnetic flow of the rotor in the static coordinate through a self-adaption magnetic flow regulating algorithm; and solving a position angle of the rotor through arc tangent, wherein the position angle of the rotor is an initial position angle of the rotor when the position of the rotor is stable. The invention judges the primary excitation time of the rotor through reasonable arrangement and provides the endurance for accurately starting integral operation; a self-adaption magnetic flow regulator can fast and accurately calculate the position of the rotor, not only eliminate DC component inside a passage, but also greatly enhance the calculation accuracy of the position of the rotor, and the calculation accuracy and the calculation time of the position of the rotor are controllable because the integral algorithm is adopted; in addition, in order to ensure the accuracy and the position of the rotor, a filtering judging algorithm is added into the algorithm, thus the judging accuracy of an initial value is greatly enhanced.

Description

technical field [0001] The invention relates to one of the key technologies of static variable frequency start-up control without a position sensor of a pumped storage power station, which belongs to the static variable frequency start technology of a pumped storage power station. Background technique [0002] At present, in countries all over the world, static variable frequency start-up is generally used as the preferred starting method for pumped storage power stations. In the automatic control system and complete sets of equipment of pumped storage power stations, static frequency converters are the key starting equipment. It is of great significance for the fast and reliable start-up of energy generating units and the stable operation of pumped storage power plants. For a long time, the control system equipment of my country's large-scale pumped storage power stations has generally been imported from abroad by way of binding bidding with the main engine, and domestic re...

AI Technical Summary

Problems solved by technology

[0004] In the start-up control of the frequency converter based on the position sensor, judging whether the initial position of the rotor is correct is one of the key technologies for starting the synchronous motor. The existing literature has introduced the principle of judging the initial position, but there is no in-depth research on it. Related literature

Images