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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.

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Table1
Table1

Performance Index

Converter Type

Diode Rectifier

Thyristor Rectifier

Supply phase voltage

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body(V_S)

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bodyV_S

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bodyV_S

Supply line current

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body(i_S)

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body--uriencoded--\sqrt\frac%7B2%7D%7B3%7Di_d

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body--uriencoded--\sqrt\frac%7B2%7D%7B3%7Di_d

Supply fundamental line current

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body--uriencoded--(i_%7BS1%7D)

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body--uriencoded--\frac%7B\sqrt%7B6%7D%7D%7B\pi%7Di_d

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body--uriencoded--\frac%7B\sqrt%7B6%7D%7D%7B\pi%7Di_d

Active power

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body(P)

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body--uriencoded--\frac%7B3%7D%7B\pi%7D\sqrt%7B6%7DV_%7BS%7D i_%7Bd%7D

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body--uriencoded--\frac%7B3%7D%7B\pi%7D\sqrt%7B6%7DV_%7BS%7D i_%7Bd%7D\cos(\alpha)

Apparent power

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body(S)

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body--uriencoded--\sqrt%7B6%7DV_%7BS%7D i_%7Bd%7D

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body--uriencoded--\sqrt%7B6%7DV_%7BS%7D i_%7Bd%7D

Power factor

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body(pf)

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body--uriencoded--\frac%7B3%7D%7B\pi%7D=0.955

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body--uriencoded--\frac%7B3%7D%7B\pi%7D\cos(\alpha)

DC current

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body(i_d)

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bodyi_d

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bodyi_d

DC voltage

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body(e_d)

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body1.35V_L

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body1.35V_L\cos(\alpha)

Semiconductor average current

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body--uriencoded--\frac%7Bi_d%7D%7B3%7D

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body--uriencoded--\frac%7Bi_d%7D%7B3%7D

Semiconductor RMS current

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body--uriencoded--\frac%7Bi_d%7D%7B\sqrt%7B3%7D%7D

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body--uriencoded--\frac%7Bi_d%7D%7B\sqrt%7B3%7D%7D

Table 1: Performance Indices for three-phase full-wave six-pulse rectifiers.

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Figure3
Figure3

Fig3_Lab1.PNG

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.

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Figure4
Figure4

Fig4_Lab1.PNG

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.