Current control method using voltage deadbeat control for single phase utility interactive inverter

In this paper, a new control method for the utility interactive inverter based on the deadbeat control to improve the control response for an utility current with small LC filter is proposed. Today, the power generation systems like thermal power generation, hydroelectric power generation, or power generation system without ineligible environmental pollutions are used as main power resources. However, when demand for electricity swells more, it is difficult to construct new power plants, because of the environmental problem. In recent years, the distributed generation systems using new energy resources are paid much attention. These systems link to a commercial source, so the systems require the utility interactive inverter. The demands for these inverters are the good controllability and the cost performance. Deadbeat control is one method to ensure the output voltage or current perfectly matches to the references at the sampling instant, so adopting this control law to the utility interactive inverter, the response of the system is much improved with small LC filter component compared with the conventional PI control, which results in the improvement of the cost performance of the inverter. The utility interactive inverter is linked to the commercial source via interactive inductor, so the inverter control the output voltage based on the deadbeat control to regulate the output current through the interactive inductor, as the result very fast transient response of the utility current can be achieved. In this paper, the advantages and the disadvantage of the proposed method are discussed throughout simulations and experiments.