The objective of any performance index is to evaluate quantitatively and qualitatively the operation of an equipment and allow comparisons to be made between various configurations. In this example the equipment is based upon an electric supply - static converter - load interaction and, therefore, the performance indices are derived from measured electric variables as voltages and currents. The most used indices are presented in Table I.
Performance Index | Converter Type |
|---|
Diode Rectifier | Thyristor Rectifier |
Supply phase voltage | | |
Supply line current | | Mathinline |
|---|
| body | --uriencoded--\sqrt\frac%7B2%7D%7B3%7Di_d |
|---|
|
| | Mathinline |
|---|
| body | --uriencoded--\sqrt\frac%7B2%7D%7B3%7Di_d |
|---|
|
|
Supply fundamental line current | Mathinline |
|---|
| body | --uriencoded--(i_%7BS1%7D) |
|---|
|
| | Mathinline |
|---|
| body | --uriencoded--\frac%7B\sqrt%7B6%7D%7D%7B\pi%7Di_d |
|---|
|
| | Mathinline |
|---|
| body | --uriencoded--\frac%7B\sqrt%7B6%7D%7D%7B\pi%7Di_d |
|---|
|
|
Active power | | Mathinline |
|---|
| body | --uriencoded--\frac%7B3%7D%7B\pi%7D\sqrt%7B6%7DV_%7BS%7D i_%7Bd%7D |
|---|
|
| | Mathinline |
|---|
| body | --uriencoded--\frac%7B3%7D%7B\pi%7D\sqrt%7B6%7DV_%7BS%7D i_%7Bd%7D\cos(\alpha) |
|---|
|
|
Apparent power | | Mathinline |
|---|
| body | --uriencoded--\sqrt%7B6%7DV_%7BS%7D i_%7Bd%7D |
|---|
|
| | Mathinline |
|---|
| body | --uriencoded--\sqrt%7B6%7DV_%7BS%7D i_%7Bd%7D |
|---|
|
|
Power factor | | Mathinline |
|---|
| body | --uriencoded--\frac%7B3%7D%7B\pi%7D=0.955 |
|---|
|
| | Mathinline |
|---|
| body | --uriencoded--\frac%7B3%7D%7B\pi%7D\cos(\alpha) |
|---|
|
|
DC current | | |
DC voltage | | |
Semiconductor average current | | Mathinline |
|---|
| body | --uriencoded--\frac%7Bi_d%7D%7B3%7D |
|---|
|
| | Mathinline |
|---|
| body | --uriencoded--\frac%7Bi_d%7D%7B3%7D |
|---|
|
|
Semiconductor RMS current | | Mathinline |
|---|
| body | --uriencoded--\frac%7Bi_d%7D%7B\sqrt%7B3%7D%7D |
|---|
|
| | Mathinline |
|---|
| body | --uriencoded--\frac%7Bi_d%7D%7B\sqrt%7B3%7D%7D |
|---|
|
|
Table 1: Performance Indices for three-phase full-wave six-pulse rectifiers.
Figure 3: Three-phase full-bridge ideal diode rectifier waveforms. (a) Supply phase voltage and supply line current, (b) DC rectifier voltage and current, (c) Diode voltage and current, (d) Supply line current spectrum, (e) DC rectifier voltage spectrum.
Figure 4: Three-phase full-bridge ideal thyristor rectifier waveforms. (a) Supply phase voltage and supply line current, (b) DC rectifier voltage and current, (c) Thyristor voltage and current, (d) Supply line current spectrum, (e) DC rectifier voltage spectrum.