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Kondoh Lab
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A power and energy lab that studies how to integrate electricity from solar and wind power into power systems effectively.
AboutAbout the lab
Integrating solar and wind power into power systems at large scale.
The Kondoh Lab mainly conducts research on the large-scale integration of photovoltaic and wind power generation into power systems.
These forms of generation have characteristics that conventional large-scale centralized generation lacks, such as widely dispersed generation facilities and output that fluctuates significantly with solar irradiance and wind speed.
Because power systems have not been designed or operated with large-scale integration of distributed generation in mind, there are concerns that various problems will arise.
The lab studies control of power consumption on the demand side and more advanced functions for power conditioners, among other topics.
Key terms
- Grid frequency
- The frequency of the power system. It deviates from the standard value (50 Hz in eastern Japan, 60 Hz in western Japan) when supply and demand are unbalanced
- Distributed generation
- A power source, such as solar or wind power, whose generation facilities are geographically widely dispersed
- Power conditioner
- A device that converts DC power from solar generation to AC and feeds it into 100/200 V low-voltage distribution lines
- kW value
- An indicator of how much generation capacity is available during peak demand, when supply is tight
NewsLab news
Students received the Best Poster Presentation Award and the Excellent Poster Presentation Award at the international conference ICEE2026
Students received the SICE Outstanding Student Award
Students received the YPC Excellent Presentation Award and the YOC Encouragement Award at the IEEJ Power & Energy Society Conference
Students received an Encouragement Award from the Power Systems Technical Committee of the IEEJ
Students received the SICE Outstanding Student Award
ResearchResearch themes
Because the output of solar and wind power fluctuates greatly with natural conditions, there are concerns that large-scale integration will cause various problems in power systems. The lab researches demand-side power consumption control, more advanced power conditioner functions, evaluation of power generation, energy storage devices, and more.
*Illustrative imageAdjusting grid frequency through power consumption control
In power systems, frequency drifts if supply and demand are not balanced at all times. The lab studies adjusting the power consumption of loads, within limits that do not harm consumers' convenience, to suppress frequency fluctuations caused by variable-output power sources.
*Illustrative imageMore advanced power conditioners
With residential solar power, output curtailment, in which generation is given up, is required when the distribution line voltage exceeds its upper limit. The lab studies coordinated control using two-way communication to avoid this as much as possible or to apply it equitably, and has also developed an output forecasting method based on solar power output data from across Japan.
*Illustrative imageWide-area smoothing effect and kW value
The output of solar and wind power varies with weather conditions, but when it is distributed across a wide area, the fluctuation is smoothed to some extent. Using time-series data on electricity demand and on solar irradiance and wind speed at many locations, the lab quantitatively evaluated the smoothing effect and the kW value for the entire area.
*Illustrative imageEnergy storage without semiconductor converters
A flywheel energy storage system stores kinetic energy by spinning a rotating body. The lab proposed a system that charges and discharges through changes in moment of inertia and requires no semiconductor converter, and confirmed through experiments that it can release energy.
MembersFaculty
The Kondoh Lab's members consist of faculty, master's students, and undergraduates.As of 2026
- Associate ProfessorJunji Kondoh
- Assistant ProfessorYukai Wang
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Roscoe Wind Farm in West Texas” Matthew T Rader / CC BY-SA 4.0 (cropped)
- Adjusting grid frequency through power consumption control: “Zero Power Demand - geograph.org.uk - 7669813” Andy Beecroft / CC BY-SA 2.0 (cropped)
- More advanced power conditioners: “Solar park inverter and mounts” Lauri Veerde / CC BY-SA 4.0 (cropped)
- Wide-area smoothing effect and kW value: “Renewable energy at The Laurels Farm - geograph.org.uk - 3594164” Mat Fascione / CC BY-SA 2.0 (cropped)
- Energy storage without semiconductor converters: “Tesvolt battery energy storage system Rheineck” Kecko from Eastern Switzerland / CC BY 2.0 (cropped)
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- Related lab (星研究室): “VEM motor Wernigerode” VEM motors GmbH / CC BY-SA 4.0 (cropped)
- Related lab (山本研究室): “XBio illustration – Functional Magnetic Resonance Imaging (fMRI)” explorebiology / CC BY 4.0 (cropped)
- Related lab (杉山研究室): “Solar World wafer ( )” Oregon Department of Transportation / CC BY 2.0 (cropped)
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