What contributes to low power factor in the generator terminal? I am using a generator 40KvA, 230Vrms and 400Hz and controlling its field excitation in order to obtain 270VDC in the Dc-Link. The maximum PF that I got was 0.7.
Hello,
Well, just terminal of generator you may simple use a capacitor/ capacitors/ combination of capacitor and inductors for advancing the current vector to some degree. just calculate how much degree do you want to make advance and select the suitable value of capacitor.
Thank you
The power factor expression is a function of the displacement power factor and the total harmonic distortion. By the use for example of a full-bridge voltage source converter (VSC) at the terminal of generator which includes a system reactor at the AC side, PWM based controlled switches, and a capacitor at the DC link. The power converter will perform the control of active and reactive power (or control of the displacement power factor). It will provide the power filtering by mitigating the harmonic distortion in the current/voltage signal. This can also perform the power compensation by controlling the power angle (or frequency). It provides the power rectification, e.g. AC to DC conversion. etc.
Well, I am using a 2KHz PWM generator and I configured the PLL for 400Hz the output voltage. Should I increase the PWM? Another question is that I am using 12 pulse inverter and I designed 2 controllers, both have the same configuration. I put the Y/Y and D/Y transform in the output of each 6 pulse IGBT for the 30 phase shift. Do I need set a phase shift in the controller as well?
The PLL is for the AC to dq-frame transformation which allows you to use linear compensator e.g. PI or PID in the PWM-control scheme. Yes, increasing the switching frequency will improve the total harmonic distortion thus improving the power factor as well. The input reference commands to the PWM-controller scheme need also to be well setted, you can try with Qref=0 (reactive power reference) and Pref=max active power. Please, tries to understand well how to use the vector control method for the control of active and rective powers, frequency, voltage, etc. then you will be able to adjust properly your phase shift. I am not sure if YY and D/Y can have effect on the power factor correction. All I knows is that the transformer connection has effect if using the line commutated converter (LCC); because, the switch (e.g. thyristor) commutation rely on the line.
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