We propose a simple dc voltage sensorless single phase PFC converter by detecting an ac line voltage waveform. Both dc voltage and ac current sensors used in the conventional PFC converter are not required to construct the control system. The conventional converter circuit with a boost chopper circuit in the dc side from a rectifier circuit is used as the main PFC converter circuit. In the control system, the circuit parameters such as a series inductance and equivalent load resistance value are used to generate the sinusoidal current waveform. The dc voltage is directly controlled by the command input signal (= ) for the boost chopper circuit. The dc voltage regulation is small because of the feed forward control for the ac line voltage and no dependence of the circuit parameters. The sinusoidal current waveform in phase with the ac line voltage can be obtained. The feasibility of the proposed control system is verified by some simulation and experimental results.Index Terms-ac line voltage, dc voltage regulation, PFC converter.
Increasing interconnections of photovoltaic generation systems (PV systems) may result in difficulties of voltage management on distribution lines. Fortunately, grid interactive inverters used in the PV systems often have some surplus capacity all through the day. Therefore, it is useful to utilize the surplus capacities of the grid interactive inverters for the line voltage management. This paper aims at developing a voltage rise mitigation method by the grid interactive inverters of the PV systems with cooperating each other by a simple information network. In this method, each inverter decides its output reactive power autonomously at first, and continuously modifying it based on an additional control signal for cooperation with the other inverters. The additional control signal is very effective for utilizing the small capacities of the inverters because it can equalize the duties of the inverters. However, one of the most important issues is how to give the additional signals to the many distributed inverters. In order to find a better solution, it is demonstrated by some simulation results how the density of the additional control signal influences the effectiveness of the voltage management and the required reactive power.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.