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The single-phase three-wire distribution system is employed extensively in Japan and the several countries. It has two voltage sources, which are in phase and have the same effective values. Numerous loads are connected to this distribution system. System line currents from two sources tend to be out of balance, because consumers make use of these loads at random. If many working loads lean to a one-sided source, the power interruption will occur by the operation of circuit breakers. For preventing the above trouble, we propose a novel Current Balancer. It consists of two half-bridge converters composed of an ac reactor and two bidirectional switching devices in common with a neutral line and two dc capacitors. In this paper, it is made clear that the proposed system can equalize both source currents even if the load currents are unbalanced. Moreover, we discuss the several characteristics in steady state and transient state by simulations and experiments.

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A novel PWM control scheme for a three‐phase current source inverter of a photovoltaic (PV) generation system connected to a utility is proposed. The PV‐array output power can be adjusted by controlling the modulation factor in the proposed PWM pattern. The harmonic components of the output currents can be decreased sufficiently to satisfy the requirements of the Interactive Guidelines. Furthermore, a new Maximum Power Point Tracking control is proposed. The inverter output current should be detected, and the modulation factor may be controlled so as to obtain the maximum effective current. The inverter output power can be maintained at the maximum power point despite fluctuations of panel temperatures, insolation levels, and system voltages. © 2001 Scripta Technica, Electr Eng Jpn, 135(1): 43–55, 2001

No abstract