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

A pumped storage power station, the technology of the initial position of the rotor, applied in the direction of the electronic commutator, etc., can solve problems such as research

Active Publication Date: 2010-06-02
STATE GRID ELECTRIC POWER RES INST +2
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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

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

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Embodiment Construction

[0040] Such as figure 1 Shown is the control flow chart of the present invention, and the method for detecting the initial position of the rotor of the static variable frequency starting motor of the pumped storage power station includes the following steps:

[0041] The first step, judging the initial excitation time of the rotor, whether the initial excitation time of the rotor can be correctly judged is very critical for the initial position detection algorithm proposed by the present invention:

[0042] The motor stator line voltage value sampled by AD, when the maximum value of the three-phase line voltage is greater than 5‰ of the rated voltage of the generator stator for 5ms continuously, the current sampling time is considered as the initial excitation time of the rotor, and enters step B;

[0043] The second step is to perform PARK transformation on the three-phase voltage sampled at each sampling time starting from the initial excitation time of the rotor to obtain t...

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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...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/18
Inventor 李官军陶以彬王德顺刘华栋桑丙玉徐晓楠柴佳俞斌吕宏水冯炜杨波
Owner STATE GRID ELECTRIC POWER RES INST
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