Mitsubishi Hitachi Power Systems, Ltd.

Masaaki Tomizawa

Yasuhiro Yoshida

Yuichi Takahashi

Fumiyuki Suzuki

Takuya Yoshida

Kazunori Yamanaka

Tatsuro Yashiki

Kenichiro Nomura

Naohiro Kusumi

Eunkyeong Kim

Nobuyuki Hokari

A start control unit for a steam turbine plant, wherein inputting a measured value of a steam temperature fed to a steam turbine, a measured value or an estimated value of a rotor temperature of the steam turbine, and a measured value of a casing temperature of the steam turbine, and controlling a steam flow rate so as to increase the steam flow rate fed to the steam turbine when a difference between the steam temperature and the rotor temperature is smaller than a first regulated value and a difference between the rotor temperature and the casing temperature is a second regulated value or larger.

Start control unit for steam turbine plant

Disclosed is a steam turbine power plant adapted to start operating safely even if prediction accuracy of its startup constraints cannot be obtained. The system calculates predictive values and current values of startup constraints of a steam turbine from process variables of plant physical quantities, next calculates in parallel both a first control input variable for a heat medium flow controller based on predictive values, and a second control input variable for a main steam control valve based on the current values, and while preferentially selecting the first control input variable, if the first control input variable is not calculated, selects the second control input variable instead. After the selection of at least one of the first and second control input variables, the system outputs an appropriate command value to the heat medium flow controller and the main steam control valve according to the kind of selected control input variable.

Steam turbine power plant

Disclosed is a steam turbine power plant adapted to start operating very efficiently by highly accurate look-ahead control of a plurality of its startup constraints. The power plant includes a fundamental startup constraint prediction devicethat calculates from a control input variable of the controllera prediction period about a fundamental startup constraint which is short in response time, a reference control input variables calculating devicethat calculates such a reference control input variable of the controlleras the value predicted and calculated by the fundamental startup constraint prediction devicewill not exceed a limit value, other startup constraint prediction deviceseach calculating a corresponding prediction period of data about desired one of other startup constraints from the prediction period of reference control input variables data, other control input variable calculating deviceseach calculating corresponding other control input variables of the controllerfrom the value predicted and calculated by the other startup constraint prediction device, and a control signal output deviceorthat outputs a command value to the controllerin accordance with a value selected from the reference control input variable and the other control input variable.

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Tokyo, Japan

Masaaki Tomizawa