Control system with adaptive process controllers especially adapted for electric power plant operation

For use in power control systems, an integrating controller responsive to an input indicative of the difference between a reference value and a parameter to be controlled for providing an output to control the parameter, said integrating controller comprising:

• a. a proportional circuit responsive to the input to provide a proportional output according to a gain K;
• b. an integrating circuit having a time constant T and responsive to the input to provide an integrated output;
• c. a summing circuit responsive to the outputs of said proportional circuit and of said integrating circuit to provide the controlling output;
• and
• d. switch means operative in a first mode in response to the presence of a first system's index to apply the input to said integrating circuit and in a second mode in response to the presence of a second system's index for disconnecting said input from said integrating circuit.

An integrating controller responsive to an input indicative of the difference between a reference value and a measured, system's variable to provide a corrective output for effecting control of the variable, said integrating controller comprising:

• a. integrating means for integrating the input with a time constant T;
• b. proportional means for providing an output proportional to the input in accordance with a gain constant K;
• c. summing means responsive to the outputs of said integrating means and said proportional means to provide the corrective output;
• d. first and second function generator means, each responsive to a system index independent of the input for providing, respectively, signals indicative of the gain K and the time constant T to said integrating means and said proportional means in accordance with first and second functions, respectively.

An integrating controller responsive to an input indicative of the difference between a reference value and a measured, system's variable to provide a corrective output for effecting control of the variable, said integrating controller comprising:

• a. integrating means for integrating the input with a time constant T;
• b. proportional means for providing an output proportional to the input in accordance with a gain constant K;
• c. summing means responsive to the outputs of said integrating means and said proportional means to provide the corrective output;
• d. multiplying means for variably multiplying the input to provide an output to be applied to said proportional means and to said integrating means;
• and
• e. means operative in a first mode for applying a first multiplying factor to said multiplying means and in a second mode for applying a second multiplying factor to said multiplying means, said applying means operative in the first mode if the system index is above a predetermined level and in the second mode if the system index is below the predetermined level.

An integrating controller responsive to an input indicative of the difference between a reference value and a measured, system's variable to provide a corrective output for effecting control of the variable, said integrating controller comprising:

• a. integrating means for integrating the input with a time constant T;
• b. proportional means for providing an output proportional to the input in accordance with a gain constant K;
• c. summing means responsive to the outputs of said integrating means and said proportional means to provide the corrective output;
• d. first multiplier means responsive to the input to provide an output according to the input multiplied by a factor to be applied to said proportional means;
• e. first decision means operative in a first mode if a system's index is above a first level to apply a first factor to said first multiplying circuit and in a second mode if the index is below the first level to apply a second factor to said first multiplying circuit;
• f. second multiplying means responsive to the input to provide an output according to the input multiplied by a factor to be applied to said integrating means;
• and
• g. second decision means operative in a first mode if the index is above a second level to apply a third factor to said second multiplying means and in a second mode if the index is below the second level to apply a fourth factor to said second multiplying means.

An integrating control responsive to an electrical input signal indicative of the difference between a reference value and a measured, system's variable to be controlled for providing an output to control the variable, said integrating controller comprising:

• a. proportional means responsive to the electrical input signal for providing an output according to a gain K;
• b. integrating means having a time constant T and responsive to the input to provide an integrated output;
• c. summing means responsive to the outputs of said proportional means and of said integrating means to provide the controlling output;
• and
• d. switch means operative in a first mode in response to the presence of a first system's control index to apply the input to said integrating means, and in a second mode in response to the presence of a second system's control index for disconnecting the input from said integrating means.