A Simplified Analog Control Method for Grid-Tied Single Phase Boost Inverter
| Autor: | Irwan Purnama, 潘宜銳 |
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| Rok vydání: | 2016 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 104 Nowadays, an inverter is purposed to convert and deliver the power from a DC power source to either the AC load or the AC grid. The conversion and integration of DC power source to the grid system become important since most of the renewable power sources are DC voltage source. There are some criteria that should exist in the configured conversion system such as high reliability, compact and low cost. To meet those criteria, two important strategies should be considered i.e. implementing a proper power inverter topology and designing high-performance control method. There are many inverter topologies proposed in many references for single-stage DC/AC power conversion. Differential boost inverter (DBI) is a kind of topology that can boost a lower voltage of the DC power source to a higher AC voltage. Among all the inverter topologies, this topology is very attractive since it is constructed from two bi-directional boost converters. Since each of the converters generates a DC-biased AC voltage, the inverter generates a differential output AC voltage which is obtained from the output voltage difference of the two-converter. In this work, one-cycle control (OCC) method is designed and implemented in a DBI. This control method is preferred to be implemented because of its advantages such as fast dynamic response and better perturbation rejection. Based on the triangle rule of the real-time integrator, OCC can track the variable reference voltage of the power converter. Therefore, the control method has an ability to follows a DC-biased AC voltage reference and to handle the input voltage perturbation. To connect the DBI to the AC grid, a power control shifting phase (PCSP) method is implemented in this work. In this method, the injected grid power is controlled by means of the inverter output voltage shifting phase. The power control is designed to achieve a unity power factor (PF) by implementing a zero reactive power reference so that only active power is injected to the AC grid. Both simulation and experimental have been done to verify that the designed controller can achieve a unity power factor with acceptable THD level. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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