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With the increasing the number of Photovoltaic generators (PV) connected to distribution system (DS), several concerns such as rise and sudden change of voltage on distribution line are growing in Japan. Step Voltage Regulator (SVR) is well known as the one of voltage control equipment used in current DS. Meanwhile, SVR cannot regulate rapid voltage change because SVR has time delay against variation of voltage. In contrast, Static Var Compensator (SVC) is the effective device to control voltage changed rapidly. However, since the cost of SVC with large capacity is expensive, it is important to reduce the capacity of SVC in order to increase the introduction of SVC into power system. From this background, the novel control method of SVR using solar radiation information to reduce the capacity of SVC is proposed in this paper. The effectiveness of the proposed method is confirmed by numerical simulation with real time simulator.

In recent years, power quality in distribution system becomes to be greatly concerned. There are two power quality problems greatly. One is the voltage rise, the other is harmonics voltage. The voltage rise in distribution system is caused by leading current from Static Capacitors (SCs) which are widely installed at receiving points by consumers to improve power factor. Especially, the voltage rise is caused in light-load time, because of the excessive amount of SCs. On the other hand, the harmonic voltages are caused by nonlinear loads such as power electronics devices. Since harmonic currents from nonlinear loads flow through the line and transformers, the voltage is distorted. To improve those problems of power quality, Hybrid type Power Quality Conditioner (HyPQC) is proposed. HyPQC is consist of the power electronics converter and LC circuit, it could compensate the reactive current and harmonic currents from loads. In order to use for practical application, the experimental test should be performed. From this background, this paper presents the control algorithm to compensate the reactive current and harmonic currents in case of changing the loads. The simulation and experimental results are also presented using the proto type model.