Japanese

Kondoh Laboratory 

Department of Electrical Engineering
Faculty of Science and Technology
Tokyo University of Science

Outline

North Hoyle Offshore Wind Farm in Wales Solar energy and wind energy are sustainable and domestic energy resources, with no emission of greenhouse effect gases, no radioactive waste, and no seriously explosive disaster*. It is important to raise the share of such renewable energy in the whole energy consumption, in the view points of environmental influence, energy security, and a nation's trade balance. One of the most efficient way to use them is to integrate photovoltaic (PV) power and wind power into electric power systems.
However, when compared to the conventional power plants such as hydro, thermal, and nuclear power plants, PV power generation and wind power generation have disadvantages to distribute geographically due to low energy density (so it is called as 'dispersed generation') and to let output power fluctuate uncertainly according to variation of weather conditions. Since historically the electric power systems have been designed and operated while considering the one-way power flow from the fully-controlled conventional power plants to customers, various concerns are rising to integrate large amounts of PV and wind power.
This laboratory has been conducting researches on the integration of more PV and wind power into power systems as well as others on electric energy.

*: However, they may cause noise and landscape damages, and they also have some kinds of faults. At present, there is no ideal power plant without such problems and faults.

 

Members (in 2018)

[Staffs] Junji Kondoh (Associate Professor), Noriko Arai (Secretary: Tuesday Work)
[Students] Two in 2nd year master's course, Two in 1st year master's course, Nine in 4th year undergraduate

 

Main Research Topics

J. Kondoh, K. Arai, T. Ichikawa, Y. Kawazoe, "Laboratory scale testbed by an engine generator to demonstrate frequency regulation", Grand Renewable Energy 2018, O-We-6-2, pp. 1-4 (2018.6)

K. Arai, K. Shibuya, J. Kondoh, "Demonstration Test of Frequency Regulation by Autonomous Load Control", 19th Int. Conf. Electrical Machines and Systems (ICEMS 2016), DS6G-4-13, pp. 1-4, Chiba, Japan (2016.11)

K. Shibuya, J. Kondoh, "Autonomous control of charging power of battery assisted vehicles for frequency regulation", Grand Renewable Energy 2014 Proceedings, P-Wd-1-27, pp. 1-4, 29 July 2014, Tokyo, Japan

J. Kondoh, "Demonstration Test of Heat Pump Water Heaters with Frequency Regulation", IEEJ Transactions on Power and Energy, Vol. 133, No. 11, Nov. 2013, pp. 910-917 (in Japanese)

J. Kondoh, "Experiment of an Electric Water Heater with Autonomous Frequency Regulation", IEEJ Transactions on Electrical and Electronic Engineering, Vol, 8, No. 3, pp. 223-228, May 2013

J. Kondoh, N. Lu, D. J. Hammerstrom, "An Evaluation of the Water Heater Load Potential for Providing Regulation Service", IEEE Transactions on Power Systems, Vol. 26, No. 3, pp. 1309-1316, Aug. 2011

J. Kondoh, "Autonomous Frequency Regulation by Controllable Loads to Increase Acceptable Wind Power Generation", Wind Energy, Vol. 13, No. 6, pp. 529-541, Sep. 2010

J. Kondoh, A. Shafiu, N. Jenkins, D. Pudjianto, G. Strbac, "Investigation of Direct Load Management Scheme While Considering End Users Comfort", IEEJ Transactions on Power and Energy, Vol. 129, No. 2, Feb. 2009, pp. 283-290 (in Japanese, translated into English in Electrical Engineering in Japan, Vol. 176, No. 3, p. 19-28, Aug. 2011)

J. Kondoh, "Direct Load Control for Wind Power Integration", IEEE PES General Meeting, July 25-28, 2011, Detroit, Michigan USA

J. Kondoh, "A Direct Load Management Scheme to Control Appliances and EVs While Considering End Users Comfort", Grid-Interop 2009, 17-19 Nov. 2009, Denver, CO, USA

J. Kondoh et al., "Future Consumed Power Estimation of Time Deferrable Loads for Frequency Regulation", CIRED 2005, 6-9 June 2005, Turin, Italy

J. Kondoh et al., "Consumed Power Control of Time Deferrable Loads for Frequency Regulation'', IEEE PES Power Systems Conference & Exposition, 10-13 October 2004, New York, NY USA

Relationship between power system balance and frequency Relationship between demand/supply balance and frequency in a power system
Practically, rotational speed (which is in proportion to frequency) depends on the balance between mechanical input
(supply: a stream of water or steam into turbines) and electrical output (demand: electric loads) on synchronous generators.
 
1.2-kW PV system settled by the lab.
1.2-kW PV system settled by the lab.

Y. Miyazaki, J. Kondoh, Y. Kameda, "Forecasting system using actual multipoint PV output", Grand Renewable Energy 2018, O-Pv-8-5, pp. 1-4 (2018.6)

Y. Kanesaka, K. Iida, J. Kondoh, "Analyses of String Current and Loss in Blocking Diodes in PV Power System", 19th Int. Conf. Electrical Machines and Systems (ICEMS 2016), DS4G-4-13, pp. 1-4, Chiba, Japan (2016.11)

J. Kondoh, Y. Itami, K. Mochizuki, H. Karasawa, Y. Kameda, "Influence of Diffuse Radiation on PV Power Variation", The International Conference on Electrical Engineering (ICEE) 2016, ID: 90413, pp. 1-2, July 2016, Okinawa, Japan

J. Kondoh, "Evaluation on Reduction of Output Suppression Loss by Cooperative Control of Voltage Profile in a Distribution System with a Large Amount of Photovoltaic Power Generation", IEEJ Transactions on Power and Energy, Vol. 130, No. 11, Nov. 2010, pp. 981-988 (in Japanese)

J. Kondoh et al., "Voltage Regulation in Distribution Systems by Hierarchically Cooperative Control", IEEJ Transactions on Power and Energy, Vol. 126, No. 10, Oct. 2006, pp. 994-1002 (in Japanese)

J. Kondoh et al., "Study on Voltage Regulation Methods for Distribution Systems with Dispersed Generators", IEEJ Transactions on Power and Energy, Vol. 124, No. 12, Dec. 2004, pp. 1432-1438 (in Japanese, translated into English in Electrical Engineering in Japan, Vol. 154, No. 4, pp. 16-23, Mar. 2006)

J. Kondoh, Marta Molinas, Hiroshi Yamaguchi, Tore Undeland, "Cooperative Control for Voltage Regulation with Wind Generation", Renewable Energy 2006, pp. 1752-1755, Oct. 2006, Makuhari, Chiba

 

J. Kondoh, K. Taguchi, "Compensation for a Delay in Response of a Thermopile-type Pyranometer", IEEJ Transactions on Power and Energy, Vol. 136, No. 2, Feb. 2016, pp. 222-223 (in Japanese)

J. Kondoh, "Capacity Values of Wind Power on Different Power Systems in Japan", Grand Renewable Energy 2014 Proceedings, O-Wd-11-1, pp. 1-4, 29 July 2014, Tokyo, Japan

Monthly peak demand and monthly average wind power in Hokkaido (2010) Monthly peak demand and monthly average wind power in Hokkaido (2010)

 

J. Kondoh, T. Funamoto, T. Nakanishi, R. Arai, "Energy characteristics of a fixed-speed flywheel energy storage system with direct grid-connection", Energy, Vol. 165, Part B, pp 701-708 (2018.12)

J. Kondoh, K. Takeshima, Y. Ishida, H. Satoh, "Energy Balance Analysis for Fixed-Speed Flywheel Energy Storage System", 19th Int. Conf. Electrical Machines and Systems (ICEMS 2016), LS1C3, pp. 1-4, Chiba, Japan (2016.11)

 
Earth resistance measurement test on the sea Earth resistance measurement test on the sea
   

K. Kashiwaya, J. Kondoh, "Analysis of voltage flicker by small wind power generation", IEEJ Transactions on Power and Energy, Vol. 138, No. 7, Jul. 2018, pp. 612-621 (in Japanese)

K. Kashiwaya, J. Kondoh, "Analysis of voltage flicker by multiple small wind turbines", Grand Renewable Energy 2018, O-We-5-5, pp. 1-4 (2018.6)

J. Kondoh, "Output power variation of a 5-kW class small wind turbine", Grand Renewable Energy 2018, O-We-6-1, pp. 1-4 (2018.6)

Nguyen Duc Tuyen, J. Kondoh, K. Matsumoto, T. Funamoto, "Remote Data Acquisition of a Small Wind Turbine", The International Conference on Electrical Engineering (ICEE) 2016, ID: 90006, pp. 1-6, July 2016, Okinawa, Japan

Nguyen Duc Tuyen, J. Kondoh, K. Matsumoto, T. Funamoto, "Review of international standards on FRT requirements for WT and suggestion to Japan context on SWT", The International Conference on Electrical Engineering (ICEE) 2016, ID: 90368, pp. 1-7, July 2016, Okinawa, Japan

H. Mizuno, J. Kondoh, "Self-excitation Method of a Synchronous Generator with a Voltage Doubling Rectifier", IEEJ Transactions on Industry Applications, Vol. 136, No. 5, May 2016, pp. 375-376 (in Japanese)

Small wind turbines monitored remotely in this laboratory
0.7-kW HAWT
0.7-kW HAWT at Noda, Chiba
4.9-kW HAWT
4.9-kW HAWT at Oga, Akita
1-kW VAWT
1-kW VAWT at Sukagawa, Fukushima
 

J. Kondoh, Y. Yasuda, H. Holttinen, "Differences of Wind Integration Methodologies between High Penetration Countries and Japan", Grand Renewable Energy 2014 Proceedings, P-Wd-2-46, pp. 1-4, 31 July 2014, Tokyo, Japan

Cumulative capacity of PV ans wind power installed in the world and in Japan
Cumulative capacity of PV and wind power in the world and Japan
Source: data in IEA PVPS Trends 2015 in Photovoltaic Applications
and GWEC Global Wind Report 2015
Wind capacity and wind penetration in each country (2013) Wind capacity and wind penetration in each country (2013)
Source: Table 2 in IEA Wind Annual Report 2013, p. 5.
**: added from the following: wind capacity is from GWEC Global Wind Report 2014,
wind-generated electricity is estimated under an assumption that the capacity factor is 25%,
demand is the value in 2010 or 2011 from Overseas Electric Power Industry Statistics by JEPIC (2013) (in Japanese)