Abstract: The step SV101 four-quadrant frequency converter is a green energy feedback produced by KINCO, high-performance vector type frequency converter, supports VF control, open-loop vector control, torque control, automatic torque boost, automatic slip compensation , Standard 485 and other functions, can drive asynchronous motors and synchronous motors, used in the bread machine, centrifuge, to enhance the type of load and frequent braking and inertia occasions.
Keywords :four quadrants; frequency converter; energy saving; KINCO; energy feedback
Abstract: The Kinco SV101 four quadrant converter is the production of green energy feedback and high-performance vector type in Kinco. It supports VF, open-loop vector and torque control. It gets some functions, such as automatic torque increasing, automatic slip compensation , the standard 485, and so on. Can drive asynchronous motor and synchronous motor and apply in Kowtow machine, centrifugal machine, the occasions of improving class load and braking frequently.
Keywords:Four quadrant;Converter;Energy conservation;Kinco;Energy feedback
1. Project Overview
The boring machine (Fig. 1: The boring machine comes from the network) is also a beam pumping unit. Because it reciprocates up and down during work, it resembles the action of a hoe, so it is usually called a boring machine. Mainly by the donkey head - beam - connecting rod - crank mechanism, gear box, power equipment and auxiliary equipment and other four major components. During work, the transmission of the electric motor is changed into a donkey head up and down movement via the gearbox and the crank connecting rod mechanism. The donkey head moves the plunger of the downhole oil pump up and down by the light rod and the sucker rod, thereby continuously extracting the crude oil from the wellbore out of the wellbore .
Figure 2 (from the network) is a simple structure diagram of the boring machine. The motor load changes periodically. When starting, the load is large, and the required starting torque is large. In normal operation, the load rate is very low, generally around 20%, and the high-time load rate is only 30%. The load curve of the motor has two peaks, which are the "dead point" of the upper and lower strokes of the pumping unit. When the balance condition is not applied, the load on the upper and lower strokes is extremely uneven. In the upper stroke, the sucker rod column and the liquid column need to be lifted, and the motor needs to pay a large amount of energy. At the time of the down stroke, the rod rods work on the motor to make the motor generate power. The balance weight is usually added to the crank of the pumping unit to eliminate the unbalance of the up and down stroke load. The adjustment of the balance block is better, the time of its power generation state and the energy generated are small. Since the pumping load changes every moment, balancing the counterweight, it is impossible to make the exact same change with the pumping load. Most of the pumping The weight balance of the oil machine is seriously unbalanced, resulting in excessive inrush current. The inrush current is 5 times the maximum operating current and even 3 times of the rated current. Adjusting the balance weight can reduce the impulse current by 1.5 times the normal operating current.
The breading machine is a typical variable torque load characteristic, and the load changes significantly during the ascent and descent. The inverter is applied to the steamer, and the voltage of the DC pump is obviously increased. Therefore, the application of the inverter of the steamer usually includes: the energy consumption mode of the inverter and the braking unit; the drive control of the inverter plus the feedback unit; the drive control of the four-quadrant inverter; Compare several drive control methods;
2, engineering control analysis
2.1 Ordinary frequency converter + brake unit control
This method is to install a braking unit and a braking resistor at both ends of the DC bus. When the DC bus voltage reaches a certain value, it is consumed through the resistor; this method can be more convenient to achieve, at the expense of more power consumption, it can not be During the descending process, the motor power generation energy is fed back to the power grid. At the same time, the resistance consumption will generate a large amount of heat, affecting the environment of the entire control cabinet. In this way, the overall power factor exhibited by the steamed bread machine is low, which has a great impact on the power grid quality.
2.2 Inverter + Capability Feedback Unit
This method is a method in the four-quadrant and brake unit mode, which can play an energy feedback role, but there are still some deficiencies, wiring is complex, harmonic content is large, feedback efficiency is not high, the impact on the grid is still Large; (At present, many inverter manufacturers in the so-called four quadrants are basically in this mode)
2.3 Four-quadrant inverter
In addition to the functions of common inverter applications, it is possible to feed back all the excess energy released during the down process of the hammer machine to the power grid, so as to achieve the goal of truly green energy saving. With the requirements of the national energy conservation and emission reduction, the Shantou machine uses a four-quadrant inverter. More and more
3. Introduction of Kinco Four Quadrant SV101 Inverter
Performance advantages
â— The inverter output torque is large;
â— Solve the problems of traditional frequency converter speed regulation on the power grid pollution, low efficiency, poor energy saving;
â— The use of four-quadrant inverters eliminates the need for any additional energy or feedback devices, which greatly reduces the need for system balance.
â— reliable operation, more energy-saving and environmental protection than traditional methods;
â— High power factor at full load;
Compared with other brands, in addition to the above features, the SV101 four-quadrant frequency converter has a single L mode at the input, which simplifies the wiring and harmonic components, and also simplifies the entire cabinet maximally. Figure 6 and Figure 7 show the two industries. Comparison diagram of the modes.
4. Inverter parameter setting and project debugging
The above figure shows the application schematic of the SV101-4T-0037G in the field. From the schematic diagram we can see that in front of the four-quadrant inverter, we only have one input dedicated reactor. At the same time, the original star delta start control is retained; the work/inverter switching operation can be easily realized to facilitate the maintenance of the equipment;
KINCO SV101 series four-quadrant inverter back-side factory parameters and hardware wiring do not need to make any changes to the setting, to meet the needs of the scene, the customer needs to be the same as the control of ordinary inverter wiring and parameter settings;
The specific parameters are as follows:
5 Conclusion
From the long-term follow-up observation of our company's SV101 site, the field wiring is concise. The energy saving rate of asynchronous motors is over 30%, which is much higher than the project requirements. The investment recovery time of the project is greatly shortened; the interference to the equipment and power grid is low, and the product can adapt If the temperature difference is large and the oil is heavy, the on-site performance failure rate is low;
With the country’s increased investment in energy-saving and emission-reduction, the energy-saving effect of the four-quadrant frequency converter is significant, and the application of the steamed bread machine will be a trend in the future and will be popularized.
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