Researching On Designing The Control System Of Distributed Generation Units

More recently, developing renewable energy has received great attentions in these days, for the exhausting of traditional energy resources and environment protection. Power-electronic-technique-based converters make wide areas for the "new sources" supply. So researching on the interface controllers now becomes an important issue in developing the Distributed Generation Systems (DGS). This dissertation is focused on researching and designing the inverting controller under different modes of power supply.Firstly, the thesis introduces controller design under the mode of the DGS as the only supply. By analyzing the mathematic model, dual control loops for output capacity's voltage and inductor's current has obtained under rotational coordinate. According to the cut-off frequency and phase angle, the parameters of the PI controller had been set. Also the switching frequency of SPWM modulation and the output filter has reasonable chose. The simulation result certificates the good performance of the controller.Under the grid-connected mode, the DGS has fixed as a "load", according to this idea, dual control loops for output power and current is chose as the control strategy, by optimize designing the PI parameters of the average power control loop, current control loop and soft-PLL loop, and reasonable choosing the isolated transformer, the MATLAB simulation model of the inverter-based grid-connected DGS has established, possessing the great performance of stable and dynamic responses.Then, under analyzing on the circuit current and the output power of the parallel operation of two DGS, adopts the wireless droop control method, establishes the simulation model, according to the simulated results, the possibility of the Multi-DGS supplying system based on the parallel technology is proofed.The thesis also introduces the hardware of the DGS Interface, Mitsubishi IPM module is selected as inverter bridge, TMS32LF2407 is selected as the micro-controller, also particularly explains the effects of the assistant circuit in theinverter set.At Last, the thesis introduces the methods of dealing with the islanding operation mode, frames the integrated grid-connected set for DGS, and analyses the possibility of realizing the controller. Also it assures the future researching directions of the item.