Self-starting control system and method for a beam pumping unit
A beam pumping unit and control system technology, applied in the control system, motor generator control, single multi-phase induction motor starter, etc., can solve the problems of low recombination power, large inrush current, and switch equipment contacts Problems such as the impact of service life, to achieve the effect of fast action time, avoiding inrush current, and improving recombination efficiency
Active Publication Date: 2021-11-05
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
After the voltage sag is eliminated, the three-phase voltage on the grid side returns to normal. If the motor is started directly at this time, since the magnitude and frequency of the reverse electromotive force generated by the motor are different from the grid side voltage, a large inrush current may occur, causing heavy The combined power is low, which affects the service life of the switchgear contacts
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[0029] In order to clearly illustrate the technical features of the solution, the solution will be described below through specific implementation modes.
[0030] see Figure 1 to Figure 3 , the present invention is: the present invention also provides an intelligent self-starting control system of a beam pumping unit, which includes a voltage transformer 1, the output end of the voltage transformer 1 is connected to a signal conditioning unit 2, and the signal conditioning unit 2 is analog The output end is connected to the sample-and-hold circuit 3, the output end of the sample-and-hold circuit 3 is connected to the analog-to-digital converter 4, the digital output end of the analog-to-digital converter 4 is connected to the CPU 5, and the control output end of the CPU 5 is connected to a self-starting actuator that controls the phase voltage signal 6. The output end of the CPU 5 is connected to the input end of the sample and hold circuit 3 to form a synchronous sampling si...
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The invention provides a self-starting control system and method of a beam pumping unit, belonging to the technical field of electric automatic control. The technical solution is: an intelligent self-starting control system of a beam pumping unit, which includes a voltage transformer, the output end of the voltage transformer is connected to a signal conditioning unit, and the analog output end of the signal conditioning unit is connected to a sampling and holding circuit. The output end of the circuit is connected to the analog-to-digital converter, the digital output end of the analog-to-digital converter is connected to the CPU, the output end of the CPU control is connected to a self-starting actuator for controlling the phase voltage signal, and the output end of the CPU is connected to the input end of the sample-and-hold circuit to form a synchronous sampling Signal clock acquisition loop. The beneficial effects of the present invention are: when the motor stops running due to a voltage sag or a short-term interruption, if all starting conditions are met, the self-starting actuator will issue an automatic start command, and the motor will restart; three-phase independent control.
Description
technical field [0001] The invention relates to the technical field, in particular to an intelligent self-starting control system and method for a beam pumping unit. Background technique [0002] Voltage sag refers to the instantaneous reduction of the voltage effective value to the range of 10%-90% of the rated value at the system frequency, and its duration is generally half a power frequency cycle to several seconds. The main causes of voltage sags are voltage sags caused by faults, voltage sags caused by high-power induction motor startup, and voltage sags caused by transformer excitation inrush current. Due to the complex structure of the oilfield distribution network and the large number of high-power equipment and transformers, the problem of voltage sag is unavoidable and brings huge economic losses. It has become the most serious power quality problem in the oilfield distribution network. [0003] With the development of science and technology, modern industrial eq...
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IPC IPC(8): H02P1/02H02P1/26
CPCH02P1/029H02P1/26
Inventor 齐光峰李炜王强孙东范路王莉刘聪岳宇李云飞曲泽奇仉志华
Owner CHINA PETROLEUM & CHEM CORP