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LINE SIDE HARMONICS OF THREE-PHASE CURRENT CONTROLLED RECTIFIERS IN CONTINUOUS AND DISCONTINUOUS OPERATION MODE
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| Author(s) |
Manfred Grötzbach; Thomas Strasser; Leo Lorenz |
| Abstract |
Because of the nonlinear switch function of the semiconductor valves, the line current of converters contains harmonics. These produce voltage drops across the equivalent supply impedance which must not exceed certain limits in the interest of other loads. A simple method which permits any dc ripple including discontinuous operation is provided for the pre-determination of these disturbances. The analytical calculation is based on the difference equation for the dc current and results in a piecewise description. The associated control and overlap angles are determined from the working point specified by the mean dc current value and the emf. Because of the analytical description, it is possible to carry out the evaluations on a small desk-top computer. The results show that, as dc ripple increases, the line current harmonics differ very considerably from the known values for good smoothing. The harmonics of the mains voltage also therefore change quite considerably and this affects the distortion factor correspondingly. |
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| Filename: | Unnamed file |
| Filesize: | 3.28 MB |
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| Type |
Members Only |
| Date |
Last modified 2021-02-08 by System |
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