| With the development of power electronics technology, microelectroinctechnology and modern control theory, the application of digital controllers is growing inthe inverter power supply. The three-phase Inverter studied by this paper is mainly usedfor ship. The inverter will be powered by the rectified master power when the masterpower was normal. However, if the master power was failed, the inverter will be poweredby the battery. Thus the inverter have to work normally when it is in two different voltagelevels or switching process, which is the special characteristic of inverter. In addition, theinverter must have a good ability to adapt to the operations with load. Therefore, it is veryimportant and practical to research the dynamic performance of the inverter.For the boost converter, the mathematical models of a single and dual loop controllersbased on the switching network are derived. The dual loop includes outer output voltageloop and inner average inductance current loop. As the input voltage switched between300～400V and190～255V, there would be disturbances in the output voltage withoutproper controller. This paper would compare some classical control in boost converter,such as a single loop, dual loop and feed-forward control. It proves that feed-forwardcontrol would achieve the most excellent performance by simulation and practicalexperiments.For the three-phase inverter, we also modeled its mathematical models in differentcoordinates and analyzed their characteristics. It’s more convenience to control thethree-phase inverter under dq rotating coordinate with decoupling rather than staticcoordinate. The controller design is based on pole assignment and in order to improveutility of dc voltage, SVPWM (space vector pulse width modulation) is applied in system.The design of main parameters of experiment platform is given. Finally, this paperproves that the overall design is feasible and the control parameter is reasonable by theexperimental platform. |
PDF Full Text Request