A Comparison of Electric Power Smoothing Control Methods for the Distributed Generation System

Goto

Machida

et al. 2019

Self Cite

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.

Section: Introductionmentioning

confidence: 99%

A power smoothing control method for a photovoltaic generation system using a water electrolyzer and its filtering characteristics

Goto

Machida

et al. 2019

Self Cite

“…The hydrogen storage volume can be brought close to the reference level by adjusting the power generated by the FC in accordance with Eqs. (18) and (19). Table 1 gives the ratings of the PV system, FC unit, and EL unit used in the simulation, and Table 2 gives the parameters of the PV model.…”

Section: Power Generated By the Fcmentioning

confidence: 96%

“…In order to reduce the fluctuations in the range of load frequency control (LFC), which varies from 2 min to 20 min, the smoothing constant is set to α = 0.002, as shown in Table 5 [6]. The cutoff frequency when α = 0.002 is 1.59 × 10 −4 Hz [18]. A PSIM (power electronics circuit simulator) is used in the simulation.…”

Section: Simulation Conditionsmentioning

confidence: 99%

A Hydrogen Management Method in Residential Distributed Generation Systems with Photovoltaic Cells and Hydrogen‐Storage Type Fuel Cells

Takubo

Imai

et al. 2015

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SUMMARYRecently, renewable energy has been attracting attention as a result of global warming and the depletion of fossil fuels. Photovoltaic (PV) systems have spread rapidly around the world because they generate electric power quietly and can be installed in many places. The output power generated in a PV system fluctuates with changes in solar irradiance and panel temperature. The reverse flow of surplus power in output spikes may have a negative effect on electric power quality, such as on the frequency and voltage in a power system. A residential distributed generation (DG) system composed of a fuel cell (FC) unit, an electrolyzer (EL) unit, and a PV system has been proposed in order to resolve these problems. In order to operate this system without interruption, the hydrogen storage volume must be managed. This paper proposes a novel hydrogen management method for a residential DG system with PV cells and hydrogen-storage type FCs. The hydrogen storage volume is maintained at the preset frequency by operating the FC unit and the EL unit. Models of the PV, FC, and EL were constructed for a simulation. In the simulation, we showed that the proposed management method is viable for a residential DG system with PV cells and hydrogenstorage FCs. C⃝ 2015 Wiley Periodicals, Inc. Electr Eng Jpn, 193(3): 8-16, 2015; Published online in Wiley Online Library (wileyonlinelibrary.com).

“…In MA, the cut-off frequency decreases and the phase delay increases when the MA period T MA is set larger [7]. Therefore, the passband and phase delay of the MA filter can be adjusted by varying T MA .…”

Section: Filter Characteristics Of Ma Es1 and Es2mentioning

confidence: 99%

“…In ES1, the cut-off characteristic becomes sharper and the fluctuation reduction effect increases when the smoothing factor is set smaller; however, the phase delay also increases, which means that appropriate parameter values must be selected [2]. In ES2 too, the cut-off characteristic becomes sharper but the phase delay increases with decreasing smoothing factor [7].…”

Section: Filter Characteristics Of Ma Es1 and Es2mentioning

confidence: 99%

A Comparison of Electric Power Smoothing Control Methods for Distributed Generation Systems

Kanehira

Imai

et al. 2015

Self Cite

SUMMARYRenewable forms of energy such as solar energy have attracted attention as alternative sources of fossil fuel. The output power of photovoltaic generation systems changes steeply. Changes in output power have an effect on the electric power quality of the power system. For that reason, a system which can smooth fluctuations of output power is required. In this paper, the moving average, modified moving average, single exponential smoothing, and double exponential smoothing methods are applied to electric power smoothing control schemes for distributed generation systems with photovoltaic generation. The reduction rate of power fluctuations and the maximum stored energy of electric double layer capacitors are adopted as system evaluation measures. To confirm the effectiveness of the power smoothing control methods, a distributed generation power system with photovoltaic generation systems is simulated with the power electronics circuit simulation software PSIM. The methods are then compared by evaluating the reduction in the capacity of electric double layer capacitors without loss in the power smoothing effect. C⃝ 2015 Wiley Periodicals, Inc. Electr Eng Jpn, 193(4): 49-57, 2015; Published online in Wiley Online Library (wileyonlinelibrary.com).