STOP METHOD FOR GAS TURBINE, CONTROL DEVICE FOR GAS TURBINE, AND GAS TURBINE PLANT

PROBLEM TO BE SOLVED: To safely stop a gas turbine while suppressing damage of an apparatus, and to bring the gas turbine into a stop state within a short time.SOLUTION: A stop method for a gas turbine executes a first suction amount decrease step (S4), a suction amount keeping step (S6) and a second suction amount decrease step (S8). In the first suction amount decrease step (S4), when a stop condition for stopping the gas turbine is satisfied (ECs), a suction amount adjuster is driven in such a manner that a suction amount of air sucked by a compressor of the gas turbine is decreased. In the suction amount keeping step (S6), when a suction amount keeping condition is satisfied during the execution of the first suction amount decrease step (S4), the drive of the suction amount adjuster is stopped. In the second suction amount decrease step (S8), when a cancellation condition is satisfied during the execution of the suction amount keeping step (S6), the suction amount adjuster is driven in such a manner that the suction amount is decreased until the suction amount adjuster is brought into a gas turbine stop time state.SELECTED DRAWING: Figure 6 【課題】機器の損傷を抑えてガスタービンを安全に停止させると共に、ガスタービンを短時間に停止状態にする。【解決手段】ガスタービンの停止方法では、第一吸気量減少工程（Ｓ４）と、吸気量保持工程（Ｓ６）と、第二吸気量減少工程（Ｓ８）と、を実行する。第一吸気量減少工程（Ｓ４）では、ガスタービンを停止させる停止条件が成立（ＥＣｓ）すると、ガスタービンの圧縮機が吸い込む空気の吸気量が減少するよう、吸気量調節器を駆動させる。吸気量保持工程（Ｓ６）では、第一吸気量減少工程（Ｓ４）の実行中に、吸気量保持条件が成立すると、吸気量調節器の駆動を停止させる。第二吸気量減少工程（Ｓ８）では、吸気量保持工程（Ｓ６）の実行中に、解除条件が成立すると、吸気量調節器がガスタービン停止時状態になるまで、吸気量が減少するよう、吸気量調節器を駆動させる。【選択図】図６