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Switching Time Prediction for Digital Hysteresis Control for High Frequency Current in Grid Impedance Measurement Application
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| Author(s) |
Sandro GUENTER, Friedrich Wilhelm FUCHS |
| Abstract |
The measurement of the grid impedance is important for lter and control design, for active lter func-tionality of grid connected inverters and also for distribution network operators. It supports knowledgeof the grid and design of decentralized energy generator power #64258;ow. Not only the impedance at fun-damental frequency but also the impedance at harmonic and interharmonic frequencies is of commoninterest. With an inverter injecting a current at an individual frequency onto the power system, the realfrequency dependent value of the grid impedance can be determined. A digital hysteresis current controlis a promising method to control a voltage source inverter (VSI) for high frequency current generationin grid impedance measurement application. Digital signal processing is state of the art, but the speed ofthe analog to digital conversion is limited. When using hysteresis current control the outcome of this isthat the current leaves the dened hysteresis band because of the time discrete sampling. In this papera method using switching time prediction to minimize this current overshoot is proposed and analyzed.Simulation and measurement results are presented that show the suitability of this method. |
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| Filename: | 0335-epe2014-full-20330701.pdf |
| Filesize: | 1.114 MB |
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| Type |
Members Only |
| Date |
Last modified 2015-06-08 by System |
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