事業計画：波力発電の採算（１．５m）
□WAVE ACTIVATED POWER GENERATION
1ﾍﾟｰｼﾞ/1ﾍﾟｰｼﾞ
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* WAVE ACTIVATED POWER GENERATION
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Figure shows the image chart of the tension buoy and dumping weight for power generation
module. Long size wave activated power generation module is a combined one of two power
generation modules. Dumping weight is hung down on the long size power generation module.
Tension buoy is floating on the sea and is connected to foundation block buried in the
bottom of the sea with connecting cable. The connecting cable always connects the tension
buoy and the foundation block with constant tension. The constant tension is adjusted by
tension spring and cable drum.
In rack and pinion method, the power generation energy is obtained from the relative
movement of shroud assembly and power generation buoy. The power generation buoy always
synchronizes with the wave. When the shroud assembly is floating on the sea, it is
inevitable to move up and down by the wave. The power generation efficiency worsens when
the shroud assembly and the power generation buoy synchronize at the same time. It is
necessary to restrain the shroud assembly when we adopt the rack and pinion method in
practical use.
It is easy to connect the shroud assembly to the foundation block buried in bottom of the
sea with cable. However, this method has some faults. There are a flood tide and an ebb
tide in the sea. The cable loosens at the ebb tide when the length of the cable is matched
to the surface of the sea of the flood tide. Oppositely, the cable is cut by the tension at
the flood tide when the length of the cable is matched to the surface of the sea of the ebb
tide. Moreover, the height of the wave is not constant.
The power generation energy is obtained from the relative movement between the shroud
assembly and the power generation buoy. It is useless work to manage the absolute position
of the shroud assembly. The purpose can be achieved by shifting the phase of movement.
Seawater has the viscosity. The phase of the buoy and the shroud assembly shifts by
installing the dumping weight to the power generation module.
However, the power generation module should be connected to the bottom of the sea with
cable. Otherwise, the power generation module drifts by the wave. A pair of tension buoy is
installed at both ends of the power generation module. The tension buoy is connected to the
foundation block in the bottom of the sea, and is floating on the sea. In the tension buoy,
there is a mechanism that constantly controls the cable tension. The tension mechanisms are
composed of the motor drum that winds up the cable and the tension spring that gives cable
the tension. The magnitude of the tension is calculated from the buoyancy of the barge. The
cable becomes long by the control program at high water. Oppositely, the cable shortens at
low water. At stormy weather, the cable tension in leeward is freed.
Though the power generation efficiency of the power generation module deteriorates, the
power generation module is prevented being damaged.
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要約すると・・・。
１．波力発電の設備は海底に設置された固定ブロックに繋がれていなくてはならない。そうしない
と（当たり前だが）海上を漂流する。
２．波力発電は海岸から遠く離れた場所の方が発電効率に優れるので、風力発電のような騒音公害
は発生しないが、海には「満ち潮」や「引き潮」があるので、その位置制御は簡単ではない。
３．波力発電は、発電ブイの上下運動で発電するが、発電ブイにシンクロして発電設備が上下して
は、発電できない。その位置制御は簡単ではない。
４．位置制御の方法は特許申請済であるが、その方法によれば、かなりの水深まで容易に制御可能
である。
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