# US 2019/0173371 A1 · Energization evaluation test equipment of a pwm converter input filter

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- Number: US 2019/0173371 A1
- Document ID: US20190173371A1
- Status: Published application
- Kind: A1
- Application number: 16/273,430
- Filed: 2019-02-12
- Published: 2019-06-06
- Earliest claimed: 2016-08-24
- Assignees: Toshiba Mitsubishi-Electric Industrial Systems Corporation
- Applicants: Toshiba Mitsubishi-Electric Industrial Systems Corporation
- Inventors: Ryo IIDA
- Web page: https://patentgrep.com/patent/US20190173371A1

## CPC

- G01R 31/40: Testing power supplies (testing photovoltaic devices H02S50/10)
- G01R 1/30: Structural combination of electric measuring instruments with basic electronic circuits, e.g. with amplifier
- H02M 1/12: Arrangements for reducing harmonics from AC input or output
- H02M 1/126: {using passive filters}
- H02M 7/217: using semiconductor devices only
- H02M 5/4585: {having a rectifier with controlled elements}
- H03K 7/08: Duration or width modulation {; Duty cycle modulation}
- G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12)
- H02M: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF (transformers H01F; dynamo-electric converters H02K47/00; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters H02P)
- H03K: PULSE TECHNIQUE (measuring pulse characteristics G01R; modulating sinusoidal oscillations with pulses H03C; transmission of digital information H04L; discriminator circuits detecting phase difference between two signals by counting or integrating cycles of oscillation H03D3/04; automatic control, starting, synchronisation or stabilisation of generators of electronic oscillations or pulses where the type of generator is irrelevant or unspecified H03L; coding, decoding or code conversion, in general H03M)

## Abstract

An energization evaluation test equipment for an input filter of a large capacity PWM converter by reducing the power supply capacity to the equipment under test is provided. The energization. evaluation test is equivalent to an actual load test. An equipment under test has an input filter connected to an output terminal of an AC power source and a PWM converter connected to an output terminal of the input filter to convert an AC power source to a DC power source. The evaluation test equipment includes a PWM converter input filter and a PWM converter configured similarly to the PWM converter input filter and the PWM converter of the equipment under test, respectively, a direct current reactor connected to an output terminal of a PWM converter of the equipment under test, a PWM controller for controlling the PWM converter of the equipment under test and controlling the PWM converter of the energization evaluation test equipment, wherein, outputs of the PWM converter of the equipment under test and the PWM converter of the energization evaluation test equipment are connected in series via the direct current reactor, and the PWM controller is performed so that the output voltage of the PWM converter of the equipment under test becomes a desired value and the output current of the PWM converter of the energization evaluation test equipment becomes a desired value.

## Claims

### Claim 1

An energization evaluation test equipment of a PWM converter input filter of an equipment under test having the input filter connected to an output terminal of an AC power source and a PWM converter connected to an output terminal of the input filter to convert an AC power source to a DC power source, the evaluation test equipment comprising:
a PWM converter input filter and a PWM converter configured similarly to the PWM converter input filter and the PWM converter of the equipment under test, respectively;
a direct current reactor connected to an output terminal of a PWM converter of the equipment under test;
a PWM controller for controlling the PWM converter of the equipment under test and controlling the PWM converter of the energization evaluation test equipment;
wherein, outputs of the PWM converter of the equipment under test and the PWM converter of the energization evaluation test equipment are connected in series via the direct current reactor, and the PWM controller is performed so that the output voltage of the PWM converter of the equipment under test becomes a desired value and the output current of the PWM converter of the energization evaluation test equipment becomes a desired value.

### Claim 2 (depends on 1)

The energization evaluation test equipment according to claim 1,
wherein, the direct current reactor is separated in two reactors, and one is connected between the positive side output terminal of the PWM converter of the equipment under test and the positive side output terminal of the energization evaluation test equipment, and the other is connected between the negative side output terminal of the PWM converter of the equipment under test and the negative side output terminal of the energization evaluation test equipment.

### Claim 3

An energization evaluation test equipment of a PWM converter input filter of an equipment under test having the input filter connected to an output terminal of an AC power source and a PWM converter connected to an output terminal of the input filter to convert an AC power source to a DC power source, the evaluation test equipment comprising:
a PWM converter input filter and a PWM converter configured similarly to the PWM converter input filter and the PWM converter of the equipment under test, respectively;
a PWM controller for controlling the PWM converter of the equipment under test and controlling the PWM converter of the energization evaluation test equipment;
wherein, the PWM controller is performed so that the input current of the PWM converter of the equipment under test becomes a delayed current and the input current of the PWM converter of the energization evaluation test equipment becomes a lead current.

### Claim 4 (depends on 3)

The energization evaluation test equipment according to claim 3,
wherein, the lead current flowing through the PWM converter input filter by the lead current control of the energization evaluation test equipment and the delay current flowing through the PWM converter input filter by the delay current control of the equipment under test are in opposite phase, and the phase difference is 180° when power losses of the energization evaluation test equipment and the equipment under test are negligibly small.