KUC711AE01 3BHB004661R0001 AC6000 Voltage source inverter KUC711AE101
KUC711AE01 3BHB004661R0001 AC6000 Voltage source inverter KUC711AE101
Data Sheet
KUC711AE01 3BHB004661R0001
General Information
Product ID:KUC711AE01 3BHB004661R0001
ABB Type Designation:KUC711AE01 3BHB004661R0001
Catalog Description:KUC711AE01 3BHB004661R0001;IGCT MODULE
Long Description:KUC711AE01 3BHB004661R0001
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Core Credit:0.00
Country of Origin:Switzerland(CH)
Customs Tariff Number:85413000
Invoice Description:IGCT MODULE
Made To Order:No
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ABB Controller KUC711AE101 3BHB004661R0101 Often used in high voltage inverter systems.Asymmetric Integrated Gate-Commutated Thyristor
Performance comparison between voltage source inverter and current source inverter
The intermediate DC link of AC-DC-AC converter is usually called voltage source converter if it uses large capacitance smoothing. If called separately, the back-end inverter is called voltage source inverter (vsi), which is also called in product gb and iec standards. Its front-end rectifier part is a harmonic source for the power grid, also known as voltage type harmonic source. In contrast, the intermediate DC link of AC-DC-AC converter is called current-source converter, current-source inverter (csi) and current-source harmonic source if it uses large inductance smoothing. The reason why it is necessary to distinguish the frequency converter into voltage source and current source is that their AC input current waveform and the output AC voltage and AC current waveform and performance after frequency conversion are very different.
2 Voltage source inverter (vsi)
Almost all low-voltage inverters used in China are voltage source type. The intermediate DC is capacitor smoothing, and the DC voltage is relatively stable. The voltage waveform output by its inverter depends on the control and modulation mode of the inverter, which can be divided into two types of voltage waveform.?
2.1 Rectangular wave voltage output
If the output is double, it can also be a “convex” voltage wave. In short, it is far away from the sine shape. That is to say, there are many harmonic voltages in the voltage waveform besides the fundamental wave. The current generated under this voltage waveform is determined by the impedance (fundamental impedance and harmonic impedance) of the motor (with a section of branch cable in series). The output fundamental voltage component/fundamental impedance can obtain the fundamental current, The harmonic current can be obtained from the output harmonic voltage component/harmonic impedance. The fundamental impedance of the motor is inductive, so its harmonic inductive reactance xh is h times of the fundamental inductive reactance x1 (h is the harmonic number of each harmonic), and the harmonic voltage component of the rectangular wave voltage is 1/h of the fundamental component. Therefore, the harmonic current of each order obtained from the output rectangular wave voltage is, for example, the fifth harmonic current is about 1/25=4% of the fundamental current, and the seventh harmonic current is 1/49 ≈ 2%, Although the harmonic current component is small, it still has a certain negative effect on the motor. The harmonic component of the inverter output is seriously harmed by harmonic voltage, which is represented by voltage peak value and voltage rise rate dv/dt. It threatens the inter-phase insulation, ground insulation and inter-turn insulation of the motor, mainly the first few turns of the motor incoming line. This problem is more prominent for high-voltage motors, which has been discussed in document [1].
Frequency converters with rectangular wave or “convex” wave voltage output are now rare.
2.2 pwm modulated wave voltage output
This is the output voltage waveform of the largest number of frequency converters (whether low voltage or high voltage) today. Due to the use of sine modulation spwm or other better modulation methods, the output voltage waveform is close to sine wave, which refers to the envelope of the modulation wave, but the dv/dt of each single modulation wave is larger, because the modulation frequency reaches thousands of hz, in order to reduce the loss and heat of power electronic devices, High-speed on-off devices are used. Not only is the dv/dt larger each time, but also the dv/dt is added repeatedly. Due to the traveling wave phenomenon, the peak voltage applied to the motor terminal is also higher (not more than twice the DC intermediate voltage). As for the output current waveform, compared with the rectangular wave current output in the previous section, the harmonic current component is smaller and the current waveform is relatively closer to the sine wave, which is why pwm modulation is adopted. However, the threat of du/dt and voltage peak still exists and is more serious. In addition, there are many adverse effects on the motor, such as shaft current.
2.3 Countermeasures
In order to reduce the severity of the surge contained in the output of the frequency converter, under certain conditions, countermeasures can be taken (with the same effect) as follows: (see iec standard [1] for details)
(1) Changing the length of the motor cable and grounding the cable will change the surge amplitude at the motor end, although this measure is often difficult or impractical.
(2) Use cables with high dielectric loss (such as butyl rubber or oil-paper insulation). Special cables shielded by iron materials are also acceptable. These methods will reduce oscillation and improve electromagnetic compatibility (emc) performance.
(3) If there is a problem between phase and ground, the ground configuration can be changed.
(4) The installation of output reactor can increase the peak rise time, and the combined effect of it and cable capacitance will reduce the traveling wave peak voltage. At this time, consider increasing the voltage drop on the reactance.
(5) Installing output dv/dt filter can significantly increase the peak rise time. This measure can increase the cable length.
(6) An output sine wave filter is installed to increase the peak rise time. The possibility of adopting this scheme depends on the characteristics required by the object, especially the speed range and dynamic performance. There are two types of this scheme. Type i can simultaneously reduce the voltage stress between phase-phase and phase-ground; Type II can only reduce the phase-to-phase voltage stress. In addition, this filter can reduce the emc interference and the additional loss and noise of the motor, and the standard unshielded cable can be used after the type i filter is used.
(7) Installing a terminal unit near the motor end can suppress the overvoltage at the motor port.
(8) Reduce the voltage amplitude of each pulse, for example, use three-level or multi-level converter.
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