A Proposal Regarding VFD Test Method - Motorsummit• 3 wattmeter is recommended, 2 wattmeter is also accepted • Floating Ground (FG) of CDM and motor frame shall be connected by

© Fuji Electric Co., Ltd. All rights reserved. 1

A Proposal Regarding VFD Test Method (VFD: variable frequency drive)

(CDM: complete drive module)

Ikuya Sato

Fuji Electric Co., Ltd.

Motor Summit 2016, Zurich Switzerland


1. Introduction

2. Background of the proposal

3. Test Method

4. Japanese Test Campaign Results

5. Conclusion

Outline


1. Introduction – Fuji Electric

Power and Social Infrastructure

Industrial Infrastructure

Power Electronics

Electronic Devices

Food and Beverage Distribution

Steam turbine Cluster energy management system

Inverters Uninterruptible power supply systems

High power IGBT modules

Vending machines

Freezer and refrigerated showcases

Oil-immersed transformer

Measuring instruments

Magnetic switches

Established in 1923 25,000 employee Sales 6 billion Euro in 2015


1. Introduction – Fuji Power Electronics Product

Low Voltage Drives

Power Devices

IGBT Module SiC MOSFET Module

Medium Voltage Drives


2. Background

2015 2016 2017

IEC TC2 WG28/WG31

IEC SC22G WG18

CENELEC EN50598-1 EN50598-2

FDIS IEC 61800-9-1

IEC/TS 60034-30-2 DTS

IEC 60034-2-3 CD

CDV

IEC 61800-9-2 CDV FDIS

CDV

Maintenance start

Harmonized to IEC 61800-9

CDM (Complete Drive Modul)/Variable Frequency Drive (VFD) and motor efficiency standards will be published near future

Regarding test methods and conditions, it is necessary to discuss

Pub


2. Background

IGBT Inverter

M

A1

A2

U

V1

V2

V

W

InductionMotor

IGBT Inverter

M

A1

A2

U

V1 V2

V

W

V3

A3

InductionMotor

2 Wattmeter method

3 Wattmeter method Equivalent results in Blondel's Theorem (common mode current = 0)

2 line-line voltage detection

2 phase current detection P1+P2

3 phase voltage detection

3 phase current detection P1+P2+P3

Benefit: 2ch + 2ch power meter can be used

CDM input (2ch) CDM output (3ch)

CDM input and output (4ch)


2. Background

V com

I com

Su1 Sv1 Sw1

Sx1 Sy1 Sz1

V

940u

V

IM

V

V

V

A

2 phase modulation

CDM PWM (common mode)

5.5 kW simulation

Iu

Vuv

V com

I com

Very small(< 1mA)


3. Test Method

low frequency components below 4 kHz: almost zero

2 wattmeter can be also applied to measure active power between CDM and motor

2 wattmeter and 3 wattmeter are equivalent

V com

I com

Proposal

Vuv

V com * I com

= P com


3. Test Method

Proposal

For next edition of IEC 61800-9, and IEC 60034-2-3, to measure active power between CDM and motor, • 3 wattmeter is recommended, 2 wattmeter is also accepted • Floating Ground (FG) of CDM and motor frame shall be connected by cable

(4 cores cable) • Power meter should not be floating • Virtual neutral point by R-C filter should not be set between CDM and motor • Shielded cable should be used, and 15 m is recommended in the case of 2 wattmeter (9-

2 specifies minimum 15 m, and 2-3 specifies below 100 m.)

Tested CDM

Tested motor

A5

A6

U

V5 V6

V

W

V7

A7

R

S

T

P

N

A1

A2

V1

V2

A3

A4

V3

V4

AC Power Supply Loadτ1

ω1

FG

CDM input 2 wattmeter or 3 wattmeterAlternative

Motor output

4 cores cable

FG



Participant

1 PDS 1 Power Meter

2 PDS 2 Power Meter

3 PDS 3 Power Meter

4 PDS 4 Power Meter

5 PDS 5 Torque Meter

6 PDS 6 Power Supply

7 PDS

7 Power Drive Systems (PDS) and 6 instrument manufacturers

Location : Ono Sokki Laboratory in Yokohama



Structure:15 kW PDS case

Power Supply 440V



Test setup: 15 kW PDS case

Conditions Room temperature : 25 degrees C Humidity : 60 % Switching frequency : 2 kHz – 8 kHz (depending on inverter products) Control : Basic V/f control Rated speed : 1500 r/min (50Hz, 4 poles) Rated torque : 95.49 Nm (15kW)

Power Supply (36 kVA)

Torque meter

Load motor (22 kW IM)

Tested motor (15 kW IM)

Power meter

Tested inverter (15 kW)

Inverter and PWM rectifier for load

Shielded power cable (5m)



3 wattmeter 2 wattmeter

CDM A

CDM B

15 kW PDS



IEC 60034-2-3 Operating points

100*15000

)2()3( wattoutwattout PP −

CDM

6 CDM test results : Difference is below 0.1% of rated power (15 kW) power meter accuracy requirement (0.3% at 50 Hz)

15 kW PDS

2 wattmeter result is equivalent to 3 wattmeter result


4. Japanese Test Campaign Results 3.7 kW PDS

IEC 60034-2-3 Operating points 100*

3700)2()3( wattoutwattout PP −CDM

6 CDM test results : Difference is below 0.1% of rated power (3.7kW)

2 wattmeter can be also used for CDM output measurement


4. Japanese Test Campaign Results Additional Information 15 kW CDM Loss

All CDM meet IE2

IE1 according to IEC 61800-9-2


Additional IE class required?

IE rating

If SiC applied

15 - 20 % Loss reduction (Fuji estimation)


4. Japanese Test Campaign Results Additional Information 3.7 kW CDM Loss

All CDM meet IE2

Additional IE class required?



IE rating

If SiC applied

15 -20 % Loss reduction (Fuji estimation)


4. Japanese Test Campaign Results Additional Information

Test sequence of operation points

(1),(2),(3),(4),(5),(6), and (7) : normal (2-3 and 9-2) (1),(4),(2),(5),(6),(3), and (7) : Accepted as an alternative (Japanese proposal) Load motor control is easy to change torque (current response) than speed (mechanical response)

Test time reduction


5. Conclusion

For next IEC 61800-9, and IEC 60034-2-3, to measure active power between CDM and motor, • 3 wattmeter is recommended, 2 wattmeter is also accepted • Floating Ground (FG) of CDM and motor frame shall be connected by cable

(4 cores cable) • Power meter should not be floating • Virtual neutral point by R-C filter should not be set between CDM and motor • Shielded cable should be used, and 15 m is recommended in the case of 2

wattmeter (9-2 specifies minimum 15 m, and 2-3 specifies below 100 m.) Japanese data campaign consist of PDS and instrument manufacturers

IEC 61800-9-2 and IEC 60034-2-3 make the test setup example in an informative annex

To keep repeatability and correctness of input output test Japan would like to contribute the IEC standardization for energy saving

© Fuji Electric Co.、Ltd. All rights reserved. 20

Ikuya Sato Fuji Electric Co., Ltd., 1, Fuji-machi, Hino-city Tokyo 191-8502, Japan [email protected]

Documents

A Proposal Regarding VFD Test Method - Motorsummit• 3 wattmeter is recommended, 2 wattmeter is also accepted • Floating Ground (FG) of CDM and motor frame shall be connected by