Analiza układu napędowego z silnikiem indukcyjnym klatkowym przy bezpośrednim sterowaniu mocy i momentu elektromagnetycznego

• Autorzy: Pieńkowski K.

Warianty tytułu

EN

Analysis of direct power control and direct torque control of drive system with induction motor

• Języki publikacji: PL

Abstrakty

PL

Przedstawiono układ napędowy z silnikiem indukcyjnym klatkowym sterowanym częstotliwościowo przez falownik napięcia. Obwód pośredniczący falownika jest zasilany z sieci prądu przemiennego przez przekształtnik AC/DC o takiej samej strukturze topologicznej jak falownik napięcia. Przedstawiono metody sterowania przekształtników energoelektronicznych w tym układzie napędowym: metodę bezpośredniego sterowania mocy elektrycznej do sterowania przekształtnika AC/DC i metodę bezpośredniego sterowania momentu i strumienia do sterowania falownika napięcia i silnika indukcyjnego. Opisano układ sterowania i omówiono wybrane wyniki symulacji cyfrowej.

EN

Voltage source inverters with direct current link and PWM control are widely used in industry to realize high dynamic control for drive systems with induction motors. The common supply for the DC link of that inverters consists of an uncontrolled rectifier bridge connected to the three phase grid. This system produces harmonic distortion in the mains and the electrical braking of induction motor with energy recovery can not be realized. These disadvantages can be avoided if a controlled reversible three-phase AC/DC power converter is used at the line side. The structure of the power electronic system considered in the paper is shown in Fig. 1. Major parts of the system are two identical voltage source inverters. The three phase grid is connected to the line-side inverter by three inductances. The DC link consists of a single capacitor bank. The squirrel-cage induction motor is directly connected to the machine-side inverter. Among all methods of induction motor control the Direct Torque Control (DTC) appears to be very atractive. Because the line-side converter has identical scheme as the voltage source converter it can be controlled in the same way. In the paper the principle of DTC control is applied to the line converter and is called as Direct Power Control (DPC). The basic idea of DTC control is based on vector equations (1)-(3) and is presented in Fig 2a). For using the principle of DTC control for line-side converter two virtual flux vectors are defined by equations (5): the grid flux vector and the inverter flux vector. The basic idea of DPC control is based on vector equations (4)-(7) and is presented in Fig. 2b). The full control scheme with application the DTC control of machine-side inverter and the DPC control of line-side inverter is presented in Fig. 3 and described in Chapter 3. The performance of the considered control scheme was tested by numerical simulations. The results of simulation are presented in Fig. 4-7 and discussed in Chapter 4. Fig. 4 shows induction motor torque waveforms for motor operation and for regenerating operation caused by the change of the mechanical load. In Fig. 5 the waveforms of phase voltage and phase current of induction motor are presented. Fig. 6 shows the line voltage and the line current for power conversion from line-side to machine-side and at a power conversion from the induction machine to the mains. Fig. 7 presents the waveforms of the dc link voltage and current for the considered states of system operation. The results of investigations show the effectiveness of the considered DPC and DTC methods of control. The DPC control enables to impose nearly sinusoidal line currents with unity power factor. The control strategies are quite simple because a coordinate transformation is not required and very fast and accurate control can be obtained.

Słowa kluczowe

PL

napęd elektryczny; silniki indukcyjne; falowniki; moment magnetyczny

• Wydawca: Sieć Badawcza Łukasiewicz - Instytut Elektrotechniki
• Czasopismo: Prace Instytutu Elektrotechniki
• Rocznik: 2001
• Tom: Z. 208
• Strony: 119--130
• Opis fizyczny: Bibliogr. 7 poz., rys.

Twórcy

autor

Pieńkowski K.

• Instytut Maszyn, Napędów i Pomiarów Elektrycznych, Politechnika Wrocławska,