630
M. Chen et al.
Using this updated model, we optimized the system’s total cost. The installation
rate of EC, FC, and hydrogen tank were optimized at a PV installation rate of 1.8,
which balances purchase and sales amounts. Although the installation rates of EC
and Tank are almost the same between fixed and various models at minimum cost, the
installation rate of FC increases. Our explanation for this is that when fixed prices are
changed to volatile ones, FC plays a role in adjusting variable cost. This implies FC
installation expansion is required to mitigate demand fluctuations in volatile price.
41.5.2 Future Consideration
The daily PV supply and power demand inevitably depend on weather conditions
and other factors. Therefore, analyzing FC selling methods that can respond to these
external factors is a logical next step. The following two FC selling methods should
be considered.
1. Instead of selling at the full capacity, we should set a sales-volume ratio; i.e.
selling at a high ratio in high prices, selling in a controlled manner in moderate
prices, and not selling in low prices.
2. Since the shape of the price fluctuation curve doesn’t change significantly daily,
we should simulate FC sales accordingly. Specifically, sets sales to be suppressed
when prices rise and to be sold in large quantities when prices fall.
41.6 Summary
We evaluated a hydrogen energy technology system from both macro and micro
views. It is assumed that the technology system, which includes PV, EC and FC or
hydrogen co-firing, will be introduced around 2030 on both micro (building) and
macro (power district) levels.
On the macro side, power mix sourced from various energy technologies was
investigated. We found that hydrogen fuel cells have great potential to increase the
utilization of surplus power locally. On the micro side, a renewable energy system
using hydrogen storage technology considering power sold by FCs was created. After
evaluating this system, we clarified that incorporating the hydrogen system decreases
costs. Furthermore, after substituting consumer demand-based volatile price for fixed
price in the model, it became clear that FC installation expansion will be necessary.
We conclude that the hydrogen-based technology system has demonstrated cost
merit and environmental benefit, and that solar power could see widespread usage in
the future when combined with hydrogen storage.
Acknowledgements A part of this manuscript is adopted from the report which was conducted as
the commissioned survey of NEDO.
M. Chen et al.
Using this updated model, we optimized the system’s total cost. The installation
rate of EC, FC, and hydrogen tank were optimized at a PV installation rate of 1.8,
which balances purchase and sales amounts. Although the installation rates of EC
and Tank are almost the same between fixed and various models at minimum cost, the
installation rate of FC increases. Our explanation for this is that when fixed prices are
changed to volatile ones, FC plays a role in adjusting variable cost. This implies FC
installation expansion is required to mitigate demand fluctuations in volatile price.
41.5.2 Future Consideration
The daily PV supply and power demand inevitably depend on weather conditions
and other factors. Therefore, analyzing FC selling methods that can respond to these
external factors is a logical next step. The following two FC selling methods should
be considered.
1. Instead of selling at the full capacity, we should set a sales-volume ratio; i.e.
selling at a high ratio in high prices, selling in a controlled manner in moderate
prices, and not selling in low prices.
2. Since the shape of the price fluctuation curve doesn’t change significantly daily,
we should simulate FC sales accordingly. Specifically, sets sales to be suppressed
when prices rise and to be sold in large quantities when prices fall.
41.6 Summary
We evaluated a hydrogen energy technology system from both macro and micro
views. It is assumed that the technology system, which includes PV, EC and FC or
hydrogen co-firing, will be introduced around 2030 on both micro (building) and
macro (power district) levels.
On the macro side, power mix sourced from various energy technologies was
investigated. We found that hydrogen fuel cells have great potential to increase the
utilization of surplus power locally. On the micro side, a renewable energy system
using hydrogen storage technology considering power sold by FCs was created. After
evaluating this system, we clarified that incorporating the hydrogen system decreases
costs. Furthermore, after substituting consumer demand-based volatile price for fixed
price in the model, it became clear that FC installation expansion will be necessary.
We conclude that the hydrogen-based technology system has demonstrated cost
merit and environmental benefit, and that solar power could see widespread usage in
the future when combined with hydrogen storage.
Acknowledgements A part of this manuscript is adopted from the report which was conducted as
the commissioned survey of NEDO.