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Method for controlling ultralow-frequency stage of static variable-frequency startup of pumped storage aggregate

A pumped storage unit, static frequency conversion technology, applied in the direction of motor generator control, electronic commutation motor control, control system, etc., can solve the problems of low machine terminal voltage, large harmonic content, and difficulty in obtaining the position of the motor rotor , to achieve the effect of realizing the correct control

Active Publication Date: 2012-02-15
STATE GRID ELECTRIC POWER RES INST +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Difficulties in controlling the ultra-low frequency stage of variable frequency startup: When the motor frequency is lower than 0.2Hz, the terminal voltage is very low and the harmonic content is large, so it is difficult to directly obtain the motor rotor position through the voltage signal

Method used

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  • Method for controlling ultralow-frequency stage of static variable-frequency startup of pumped storage aggregate
  • Method for controlling ultralow-frequency stage of static variable-frequency startup of pumped storage aggregate
  • Method for controlling ultralow-frequency stage of static variable-frequency startup of pumped storage aggregate

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Embodiment Construction

[0031] The present invention will be described in further detail below with reference to the accompanying drawings and examples.

[0032] The first step is to determine the first set of inverter control pulses for variable frequency startup through initial position detection technology;

[0033] The second step, such as Figure 3-5 , Figure 7-8 150ms after the first set of inverter control pulses are sent, set the control angle of the rectifier side to 120 degrees to reduce the current at the machine terminal to 0, and perform AD sampling on the current at the grid side to confirm that the current is reduced to 0 (continuously 3 After the second current sampling is less than 5% of the rated current), the terminal 3 line voltage is continuously sampled for 5 times, and the maximum value of each sampling value is counted; according to Table 1, the line voltage with the most number of times of the line voltage in the 5 sampling The corresponding control pulse is the next set o...

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Abstract

The invention discloses a method for controlling an ultralow-frequency stage of static variable-frequency startup of a pumped storage aggregate. The method comprises the following steps: a rotor winding applies an exciting current, and a three-phase stator winding generates an induced electromotive force; when the number of stators is zero, the current of a q axis of a damping winding of a synchronous motor is 0; and the current of a d axis of the damping winding is shown in the specification. By using an algorithm for determining the position of an ultralow-frequency rotor of a static variable-frequency starting motor for pumped storage power stations provided by the invention, a vector area in which the ultralow-frequency rotor is located can be accurately calculated, thereby realizing the correct control on the contravariant side of a current transformer, and ensuring that the motor can start up quickly according to the maximum electromagnetic torque.

Description

technical field [0001] The invention relates to one of the key technologies for ultra-low frequency (motor frequency lower than 0.2 Hz) control of static variable frequency start of pumped storage units, and belongs to static variable frequency start technology of pumped storage power stations. 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, a...

Claims

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Application Information

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IPC IPC(8): H02P6/20H02P6/18H02P21/16H02P21/34
Inventor 李官军杨波王德顺陶以彬桑丙玉俞斌吕宏水陈梅吴福保姬联涛曹远志
Owner STATE GRID ELECTRIC POWER RES INST
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