In the fast start-up for combined cycle power plants (CCPP), the thermal stresses of the steam turbine rotor are generally controlled by the steam temperatures or flow rates by using gas turbines (GTs), steam turbines, and desuperheaters to avoid exceeding the thermal stress limits. However, this thermal stress sensitivity to steam temperatures and flow rates depends on the start-up sequence due to the relatively large time constants of the heat transfer response in the plant components. In this paper, a coordinated control method of gas turbines and steam turbine is proposed for thermal stress control, which takes into account the large time constants of the heat transfer response. The start-up processes are simulated in order to assess the effect of the coordinated control method. The simulation results of the plant start-ups after several different cool-down times show that the thermal stresses are stably controlled without exceeding the limits. In addition, the steam turbine start-up times are reduced by 22–28% compared with those of the cases where only steam turbine control is applied.
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February 2017
Research-Article
Coordinated Control of Gas and Steam Turbines for Efficient Fast Start-Up of Combined Cycle Power Plants
Yasuhiro Yoshida,
Yasuhiro Yoshida
Research and Development Group,
Hitachi, Ltd.,
7-2-1 Omika-Cho,
Hitachi 319-1221, Ibaraki, Japan
e-mail: yasuhiro.yoshida.xb@hitachi.com
Hitachi, Ltd.,
7-2-1 Omika-Cho,
Hitachi 319-1221, Ibaraki, Japan
e-mail: yasuhiro.yoshida.xb@hitachi.com
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Kazunori Yamanaka,
Kazunori Yamanaka
Turbine Products Headquarters Division,
Mitsubishi Hitachi Power Systems, Ltd.,
3-1-1 Saiwai-Cho,
Hitachi 317-0073, Ibaraki, Japan
e-mail: kazunori1_yamanaka@mhps.com
Mitsubishi Hitachi Power Systems, Ltd.,
3-1-1 Saiwai-Cho,
Hitachi 317-0073, Ibaraki, Japan
e-mail: kazunori1_yamanaka@mhps.com
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Atsushi Yamashita,
Atsushi Yamashita
Turbine Products Headquarters Division,
Mitsubishi Hitachi Power Systems, Ltd.,
3-1-1 Saiwai-Cho,
Hitachi 317-0073, Ibaraki, Japan
e-mail: atsushi1_yamashita@mhps.com
Mitsubishi Hitachi Power Systems, Ltd.,
3-1-1 Saiwai-Cho,
Hitachi 317-0073, Ibaraki, Japan
e-mail: atsushi1_yamashita@mhps.com
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Norihiro Iyanaga,
Norihiro Iyanaga
Turbine Products Headquarters Division,
Mitsubishi Hitachi Power Systems, Ltd.,
3-1-1 Saiwai-Cho,
Hitachi 317-0073, Ibaraki, Japan
e-mail: norihiro_iyanaga@mhps.com
Mitsubishi Hitachi Power Systems, Ltd.,
3-1-1 Saiwai-Cho,
Hitachi 317-0073, Ibaraki, Japan
e-mail: norihiro_iyanaga@mhps.com
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Takuya Yoshida
Takuya Yoshida
Research and Development Group,
Hitachi, Ltd.,
7-2-1 Omika-Cho,
Hitachi 319-1221, Ibaraki, Japan
e-mail: takuya.yoshida.ru@hitachi.com
Hitachi, Ltd.,
7-2-1 Omika-Cho,
Hitachi 319-1221, Ibaraki, Japan
e-mail: takuya.yoshida.ru@hitachi.com
Search for other works by this author on:
Yasuhiro Yoshida
Research and Development Group,
Hitachi, Ltd.,
7-2-1 Omika-Cho,
Hitachi 319-1221, Ibaraki, Japan
e-mail: yasuhiro.yoshida.xb@hitachi.com
Hitachi, Ltd.,
7-2-1 Omika-Cho,
Hitachi 319-1221, Ibaraki, Japan
e-mail: yasuhiro.yoshida.xb@hitachi.com
Kazunori Yamanaka
Turbine Products Headquarters Division,
Mitsubishi Hitachi Power Systems, Ltd.,
3-1-1 Saiwai-Cho,
Hitachi 317-0073, Ibaraki, Japan
e-mail: kazunori1_yamanaka@mhps.com
Mitsubishi Hitachi Power Systems, Ltd.,
3-1-1 Saiwai-Cho,
Hitachi 317-0073, Ibaraki, Japan
e-mail: kazunori1_yamanaka@mhps.com
Atsushi Yamashita
Turbine Products Headquarters Division,
Mitsubishi Hitachi Power Systems, Ltd.,
3-1-1 Saiwai-Cho,
Hitachi 317-0073, Ibaraki, Japan
e-mail: atsushi1_yamashita@mhps.com
Mitsubishi Hitachi Power Systems, Ltd.,
3-1-1 Saiwai-Cho,
Hitachi 317-0073, Ibaraki, Japan
e-mail: atsushi1_yamashita@mhps.com
Norihiro Iyanaga
Turbine Products Headquarters Division,
Mitsubishi Hitachi Power Systems, Ltd.,
3-1-1 Saiwai-Cho,
Hitachi 317-0073, Ibaraki, Japan
e-mail: norihiro_iyanaga@mhps.com
Mitsubishi Hitachi Power Systems, Ltd.,
3-1-1 Saiwai-Cho,
Hitachi 317-0073, Ibaraki, Japan
e-mail: norihiro_iyanaga@mhps.com
Takuya Yoshida
Research and Development Group,
Hitachi, Ltd.,
7-2-1 Omika-Cho,
Hitachi 319-1221, Ibaraki, Japan
e-mail: takuya.yoshida.ru@hitachi.com
Hitachi, Ltd.,
7-2-1 Omika-Cho,
Hitachi 319-1221, Ibaraki, Japan
e-mail: takuya.yoshida.ru@hitachi.com
Contributed by the Turbomachinery Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received July 10, 2015; final manuscript received June 26, 2016; published online September 13, 2016. Assoc. Editor: Rakesh K. Bhargava.
J. Eng. Gas Turbines Power. Feb 2017, 139(2): 022601 (9 pages)
Published Online: September 13, 2016
Article history
Received:
July 10, 2015
Revised:
June 26, 2016
Citation
Yoshida, Y., Yamanaka, K., Yamashita, A., Iyanaga, N., and Yoshida, T. (September 13, 2016). "Coordinated Control of Gas and Steam Turbines for Efficient Fast Start-Up of Combined Cycle Power Plants." ASME. J. Eng. Gas Turbines Power. February 2017; 139(2): 022601. https://doi.org/10.1115/1.4034313
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