This paper proposes a novel power smoothing control method for a photovoltaic generation (PV) system using a water electrolyzer (ELY). This method realizes that the long-period components of the PV power fluctuation are supplied to the power grid and the short-period components of the PV power fluctuation are supplied to the ELY. The power supplied to the ELY is converted to hydrogen for fuel cell vehicles. The results of the power smoothing control method are evaluated in terms of the power in the load frequency control (LFC) band and the ability of generating hydrogen. Furthermore, filtering characteristics of the proposed method are clarified. As the result, the proposed method has reduced the power in LFC band by 83.7% compared to the PV power without the power smoothing control. The filter characteristics of the proposed method have shown that fluctuating components with periods less than 1000 seconds, in which the step voltage regulator does not perform, can be sufficiently eliminated from the PV power fluctuation components. When applying the proposed method for a PV system rated at 800 kW, the ability of generating hydrogen was about 2.30% of the hydrogen required for one hydrogen station. K E Y W O R D Shydrogen storage, load frequency control, photovoltaic generation, power smoothing control, water electrolyzer Electr Eng Jpn. 2019;206:25-32.

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For the purpose of the effective use of the power facilities, the control strategy for the leveling of the active power and the compensation of the reactive power is proposed based on the fuzzy logic using small capacity of the superconducting magnetic energy storage (SMES) equipped near to the consumer. The varidity of the proposed control strategy is clarified by the simulation. The summary in this paper is as follows.(1) In the approximate reasoning, the rule for the current flowing into the SMES is added to the rules for the leveling of the active power and the energy stored in the SMES which are applied in the previous paper. Then, only PB is adopted to the membership function for this rule because of the function of the current limit.(2) The variance of the controlled results to the sustained component is indicated in the three-dimensional expression. Then, the range of the stalling factor is shown for the good controlled results of leveling the active power.(3) The controllable range in which the power control can be achieved in accordance with the power demand expands comparing with that in the previous paper.(4) The variance of the controlled results to the sustained component becomes smaller than that in the previous paper. It is clarified that the proposed control strategy can level the fluctuating load power better.

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