5/28/2018 Variable Frequency Drives PMSM

1/18

DEMO TITLES

Variable Frequency drives PMSMCase I: Converter as AFE (Active Font End) Rectifier

Case II: Converter as 18-Pulse Diode Rectifier

A-PDF Merger DEMO : Purchase from www.A-PDF.com to remove the watermark

http://www.a-pdf.com/http://www.a-pdf.com/

5/28/2018 Variable Frequency Drives PMSM

2/18

1. OBJECTIVE AND DESCRIPTIONThe following test cases are done in order to test and validate the power electron

components from the Engineering suite V6 Electrical library and analog components.

A three phase voltage source supplies a VFD that drives

ungrounded PMSM. A 700 Volts DC voltage must supply the inverter.

The PMSM has the following parameters:

At t = 0 s the reference speed is set to 150 rad/s and reverse to -100 rad/s at t = 0.4 s. T

maximum torque allows is 12 Nm. Simulate the motor drives using a Voltage Source Inver

with an input LC filter.

Case I: The converter is an AFE Rectifier

The VFD is designed as an AFE (Active Font End) Rectifier follows by a 2 Level Inverter The A

5/28/2018 Variable Frequency Drives PMSM

3/18

The VFD is designed as an AFE (Active Font End) Rectifier follows by a 2 Level Inverter The A

LC filter with damping resistor

Voltage and dq currents regulators

DC link capacitor pre-charged at 700 V

,

Switching frequency and PLL (Phase Locked Loop) PI controller

, ,

Case II: The converter is 18-pulse diode Rectifier

Source (cosine wave)

5/28/2018 Variable Frequency Drives PMSM

4/18

The diagram block control of VSI

Currents controllers

()

For q axis, ()

For d axis

Speed controller

5/28/2018 Variable Frequency Drives PMSM

5/18

5. ENGINEERING SUITE V6 RESULTSCase I: The converter is an AFE Rectifier

5/28/2018 Variable Frequency Drives PMSM

6/18

5/28/2018 Variable Frequency Drives PMSM

7/18

5/28/2018 Variable Frequency Drives PMSM

8/18

5/28/2018 Variable Frequency Drives PMSM

9/18

NETWORK CURRENT FOURIER ANALYSES

In steady state when speed is 150 rad/s

5/28/2018 Variable Frequency Drives PMSM

10/18

Conclusion

The following conclusions can be made: the network current in steady state contains less harmonics (1.2 %) as display

above,

In steady state, Fourier analyses show that the fundamental network curr

(sinewave) is nearly in phase with the source voltage (cosinewave),

In order to avoid the inrush network current (normally due to the capacitor chargin

a precharged capacitor has been used,

the torque and motor current have less harmonics (not calculated) and the torqdoesnt exceed the maximum allowed (12 Nm).

5/28/2018 Variable Frequency Drives PMSM

11/18

Case II: The converter is 18-pulse diode Rectifier

5/28/2018 Variable Frequency Drives PMSM

12/18

5/28/2018 Variable Frequency Drives PMSM

13/18

5/28/2018 Variable Frequency Drives PMSM

14/18

5/28/2018 Variable Frequency Drives PMSM

15/18

NETWORK CURRENT FOURIER ANALYSES

In steady state when speed is 150 rad/s

5/28/2018 Variable Frequency Drives PMSM

16/18

Conclusion

The following conclusions can be made: the network current in steady state contains nearly 6 % harmonics as display

above,

In order to avoid the inrush network current (normally due to the capacitor chargin

a precharged capacitor has been used,

the torque and motor current have less harmonics (not calculated) and the torq

doesnt exceed the maximum allowed (12 Nm).

6. REFERENCE BOOKS1. Power electronics. Converters, applications and design, 2nd edition.

Mohan / Underland / Robbins.

2. Power electronics. Converter Harmonics. Multipulse methods for clean power.

Derek A Paice

5/28/2018 Variable Frequency Drives PMSM

17/18

5/28/2018 Variable Frequency Drives PMSM

18/18