Method of measuring initial position of rotor with static frequency converter
A technology of rotor initial position, static frequency converter, applied in the size/direction of the magnetic field, and the use of electromagnetic/magnetic devices to transmit sensing components, etc., can solve problems such as unit startup failure, relay setting drift, and rotor initial position failure, etc. To achieve the effect of improving the success rate of startup, high safety factor and small changes
Inactive Publication Date: 2010-10-06
广州蓄能水电厂
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Problems solved by technology
A problem with any of the above circuits or components will cause the SFC to fail to measure the initial position of the rotor, which in turn will cause the unit to fail to start
In particular, the time relay K14 of the time excitation system is strictly required to act ahead of the excitation switch K120~30ms. Once the setting value of the relay or the closing time of the excitation switch K1 drifts, it will cause the SFC to fail to measure the initial position of the rotor.
In addition, since K14 is always in the excitation state during the operation of the unit, the heat generated by this long-term operation will have a bad effect on the electronic components inside K14, which makes the setting value of the relay often drift
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[0017] The principle diagram of measuring the initial position of the rotor by the static frequency converter of the present invention is as follows figure 2 As shown, the method for measuring the initial position of the rotor by the static frequency converter of the present invention includes the following steps:
[0018] 1) The static frequency converter receives the start command of the group pump working condition;
[0019] 2) The excitation switch of the excitation system is closed;
[0020] 3) The static frequency converter system detects the magnetic flux of the stator of the unit. If the magnetic flux of the stator of the unit is detected to be greater than or equal to 3% of the rated value, it starts to measure the initial position of the rotor of the unit.
[0021] The method for detecting the magnetic flux of the stator of the unit by the static frequency converter system is: at the beginning of starting, after the excitation current is applied to the rotor, the v...
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The invention relates to a method of measuring an initial position of a rotor with a static frequency converter, which comprises the following steps that: 1) the static frequency converter receives a command for starting an operating mode of a unit pump; 2) the excitation switch of an excitation system is closed; and 3) the static frequency converter system detects the magnetic flux of a unit stator, and if the magnetic flux of the unit stator is detected to be more than or equal to 3 percent of the rating, the static frequency converter system starts to measure the initial position of a unit rotor. Since the static frequency converter system starts to measure the initial position of the unit rotor when the magnetic flux of the unit stator is detected to be more than or equal to 3 percent of the rating, the success rate of static frequency converter to draw to start the operating mode of unit pumping is greatly increased, thereby effectively ensuring the success rate of starting the operating mode of unit pumping. Simultaneously, only small changes are needed for the existing equipment, the safety factor is high, and no influence can be caused to the safety production of the power plant. Therefore, the invention provides a convenient and practical method of measuring the initial position of the rotor with the static frequency converter.
Description
technical field [0001] The invention is a method for measuring the initial position of a rotor by a static frequency converter, which belongs to the innovative technology of the measuring method for the initial position of the rotor. Background technique [0002] Static frequency converter (SFC) is a unique electrical equipment for energy storage power plants. It is a driving device that achieves the speed from static to grid-connected when the unit pumps water. In the process of SFC driving the unit, measuring the initial position of the rotor is a crucial link. Whether it is successful or not directly determines whether the unit can start successfully, and it is a necessary condition for the successful start of the unit pump. During the start-up process of the pump working condition of the unit, the purpose of SFC to measure the initial position of the rotor is: during the start-up process, the unit is completely stationary to start to rotate, and the resistance suffered b...
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IPC IPC(8): G01D5/14G01R33/02
Inventor 郭小涛
Owner 广州蓄能水电厂