Power plant control device which uses a model, a learning signal, a correction signal, and a manipulation signal

A control device for a plant, adapted to calculate a manipulation signal for controlling a plant using a measurement signal obtained by measuring an operation state of the plant, comprising:

• manipulation signal generation means for generating the manipulation signal to be transmitted to the plant;
• a model adapted to simulate a characteristic of the plant;
• learning means for generating an input signal of the model so that an output signal obtained by the model simulating the characteristic of the plant satisfies a predetermined target;
• learning signal generation means for calculating a learning signal in accordance with a learning result in the learning means;
• manipulation result evaluation means for calculating a first deviation as a deviation between a first measurement signal of the plant obtained as a result of application of a certain manipulation signal to the plant and a target value of the measurement signal, and a second deviation as a deviation between a second measurement signal of the plant obtained as a result of application of an updated manipulation signal to the plant and the target value;
• and
• correction signal generation means for generating, when the second deviation calculated by the manipulation result evaluation means is greater than the first deviation, a correction signal of the manipulation signal to be generated by the manipulation signal generation means,
• wherein the learning means is configured to search the manipulation condition, with which the deviation between the output of the model and the target value becomes the minimum, within a predetermined threshold value range to learn the manipulation condition,
• the correction signal generation means is configured to vary the manipulation signal within a threshold value range by the learning means so as to calculate the correction signal with which the deviation between the measurement value of the plant and the target value of the measurement value becomes the minimum, and
• the manipulation signal generation means is configured to calculate the manipulation signal for controlling the plant using at least the learning signal calculated by the learning signal generation means and the correction signal calculated by the correction signal generation means.

A control device for a plant, adapted to calculate a manipulation signal for controlling a plant using a measurement signal obtained by measuring an operation state of the plant, comprising:

• manipulation signal generation means for generating the manipulation signal to be transmitted to the plant;
• a model adapted to simulate a characteristic of the plant;
• learning means for generating an input signal of the model so that an output signal obtained by the model simulating the characteristic of the plant satisfies a predetermined target;
• learning signal generation means for calculating a learning signal in accordance with a learning result in the learning means;
• manipulation result evaluation means for calculating a first deviation as a deviation between a first measurement signal of the plant obtained as a result of application of a certain manipulation signal to the plant and a target value of the measurement signal, and a second deviation as a deviation between a second measurement signal of the plant obtained as a result of application of an updated manipulation signal to the plant and the target value;
• and
• correction signal generation means for generating, when the second deviation calculated by the manipulation result evaluation means is greater than the first deviation, a correction signal of the manipulation signal to be generated by the manipulation signal generation means,
• wherein the manipulation result evaluation means is configured to calculate weight parameter values of the learning signal and the correction signal based on the deviation, and
• the manipulation signal generation means is configured to calculate the manipulation signal for controlling the plant using at least the weight parameter values calculated by the manipulation result evaluation means, the learning signal calculated by the learning signal generation means, and the correction signal calculated by the correction signal generation means.

A control device for a thermal power plant, adapted to calculate a manipulation signal for controlling a thermal power plant using a measurement signal obtained by measuring an operation state of the thermal power plant,

• the measurement signal including at least one of the concentration of nitrogen oxide, the concentration of carbon monoxide, the concentration of carbon dioxide, the concentration of sulfur oxide, and the concentration of mercury in an exhaust gas emitted from a boiler of the thermal power plant, a flow rate of coal, a rotational frequency of a classification machine of a mill, and a generator output,
• the manipulation signal including at least one of opening of an air damper, an air flow rate, an air temperature, a fuel flow rate, and an exhaust gas recirculation flow rate of the boiler,
• the control device comprising:
• manipulation signal generation means for generating the manipulation signal to be transmitted to the thermal power plant;
• a model adapted to simulate a characteristic of the thermal power plant;
• learning means for generating an input signal of the model so that an output signal obtained by the model simulating the characteristic of the plant satisfies a predetermined target;
• learning signal generation means for calculating a learning signal in accordance with a learning result in the learning means;
• manipulation result evaluation means for calculating a first deviation as a deviation between a first measurement signal of the thermal power plant obtained as a result of application of a certain manipulation signal to the thermal power plant and a target value of the measurement signal, and a second deviation as a deviation between a second measurement signal of the thermal power plant obtained as a result of application of an updated manipulation signal to the thermal power plant and the target value;
• and
• correction signal generation means for generating, when the second deviation calculated by the manipulation result evaluation means is greater than the first deviation, a correction signal of the manipulation signal to be generated by the manipulation signal generation means,
• wherein the model includes a plurality of models corresponding to each of a burner pattern, a load level, and a coal type of the boiler of the thermal power plant,
• the manipulation result evaluation means is provided with a function of figuring out the burner pattern based on the value of the measurement signal of a flow rate of the coal supplied to the mill of the boiler, a function of figuring out a load level based on one of an output demand and the value of the measurement signal of the generator output, and a function of figuring out the coal type based on the value of the measurement signal of the rotational frequency of the classification machine of the mill, and
• the learning signal generation means is configured to generate the learning signal in accordance with the result of learning using the models corresponding respectively to the conditions figured out by the manipulation result evaluation means, and
• the manipulation signal generation means is configured to calculate the manipulation signal for controlling the thermal power plant using at least the learning signal calculated by the learning signal generation means and the correction signal calculated by the correction signal generation means.

A control device for a thermal power plant, adapted to calculate a manipulation signal for controlling a thermal power plant using a measurement signal obtained by measuring an operation state of the thermal power plant,

• the measurement signal including at least one of the concentration of nitrogen oxide, the concentration of carbon monoxide, the concentration of carbon dioxide, the concentration of sulfur oxide, and the concentration of mercury in an exhaust gas emitted from the thermal power plant,
• the manipulation signal including at least one of opening of an air damper, an air flow rate, an air temperature, a fuel flow rate, and an exhaust gas recirculation flow rate of the boiler,
• the control device comprising:
• manipulation signal generation means for generating the manipulation signal to be transmitted to the thermal power plant;
• a model adapted to simulate a characteristic of the thermal power plant;
• learning means for generating an input signal of the model so that an output signal obtained by the model simulating the characteristic of the plant satisfies a predetermined target;
• learning signal generation means for calculating a learning signal in accordance with a learning result in the learning means;
• manipulation result evaluation means for calculating a first deviation as a deviation between a first measurement signal of the thermal power plant obtained as a result of application of a certain manipulation signal to the thermal power plant and a target value of the measurement signal, and a second deviation as a deviation between a second measurement signal of the thermal power plant obtained as a result of application of an updated manipulation signal to the thermal power plant and the target value;
• and
• correction signal generation means for generating, when the second deviation calculated by the manipulation result evaluation means is greater than the first deviation, a correction signal of the manipulation signal to be generated by the manipulation signal generation means,
• wherein the model is configured to calculate a predicted value of at least the carbon monoxide concentration of the boiler of the thermal power plant and output the predicted value,
• the learning means is configured to learn the generation method of the model input signal to achieve the manipulation condition with which the variation rate of the predicted value of the carbon monoxide concentration is low and the predicted value of the carbon monoxide concentration becomes the minimum, and
• the manipulation signal generation means is configured to calculate the manipulation signal for controlling the thermal power plant using at least the learning signal calculated by the learning signal generation means and the correction signal calculated by the correction signal generation means.

A control device for a thermal power plant, adapted to calculate a manipulation signal for controlling a thermal power plant using a measurement signal obtained by measuring an operation state of the thermal power plant,

• the measurement signal including at least one of the concentration of nitrogen oxide, the concentration of carbon monoxide, the concentration of carbon dioxide, the concentration of sulfur oxide, and the concentration of mercury in an exhaust gas emitted from the thermal power plant, a flow rate of coal, a rotational frequency of a classification machine of a mill, and a generator output,
• the manipulation signal including at least one of opening of an air damper, an air flow rate, an air temperature, a fuel flow rate, and an exhaust gas recirculation flow rate,
• the control device comprising:
• manipulation signal generation means for generating the manipulation signal to be transmitted to the thermal power plant;
• a model adapted to simulate a characteristic of the thermal power plant;
• learning means for generating an input signal of the model so that an output signal obtained by the model simulating the characteristic of the plant satisfies a predetermined target;
• learning signal generation means for calculating a learning signal in accordance with a learning result in the learning means;
• manipulation result evaluation means for calculating a first deviation as a deviation between a first measurement signal of the thermal power plant obtained as a result of application of a certain manipulation signal to the thermal power plant and a target value of the measurement signal, and a second deviation as a deviation between a second measurement signal of the thermal power plant obtained as a result of application of an updated manipulation signal to the thermal power plant and the target value;
• and
• correction signal generation means for generating, when the second deviation calculated by the manipulation result evaluation means is greater than the first deviation, a correction signal of the manipulation signal to be generated by the manipulation signal generation means,
• wherein the correction signal generation means is configured to estimate a cause of an error from feature of the first or the second deviation, and to generate the correction signal based on the cause of the error, and
• the manipulation signal generation means is configured to calculate the manipulation signal for controlling the thermal power plant using at least the learning signal calculated by the learning signal generation means and the correction signal calculated by the correction signal generation means.