Methods and apparatus for dynamic systems control
First Claim
1. A method of controlling water level in nuclear power plant steam supply systems of the type having steam flow and water flow as inputs to the system and water level as an output of the system, said method comprising:
- (a) estimating the state variables of said system by applying observer theory to the inputs and the outputs of said system;
(b) generating a compensated water level from said estimated state variables, said compensated water level being dynamically related to said steam flow and feed water flow by a compensated transfer function which comprises the integration modes and unstable modes of behavior included in the overall transfer function relating the transforms of said inputs to the transforms of said outputs, said compensated transfer function having no right half plane zeros;
(c) displaying said compensated water level and said water level; and
(d) controlling said water level by comparing the compensated water level and the water level.
1 Assignment
0 Petitions
Accused Products
Abstract
Disclosed are methods and apparatus for the control of dynamic systems, more particularly complex dynamic systems and especially those systems exhibiting minimum phase behavior. The method utilizes observer theory to estimate the state variables of the system. Based in part upon the estimated values of the state variables, a pseudo or compensated output for the system is generated. This compensated output represents the steady state asymptote of the actual system output without the unstable or transient system responses. The actual outputs are then controlled by controlling the compensated output.
According to another embodiment, a bounded output may also be generated from the state variable estimates. This bounded output represents the minimum and/or maximum excursion that the actual output takes in its approach to the steady state value represented by the compensated output. This bounded output is then used to control the system so as to prevent the actual output from crossing any predetermined system limits.
-
Citations
9 Claims
-
1. A method of controlling water level in nuclear power plant steam supply systems of the type having steam flow and water flow as inputs to the system and water level as an output of the system, said method comprising:
-
(a) estimating the state variables of said system by applying observer theory to the inputs and the outputs of said system; (b) generating a compensated water level from said estimated state variables, said compensated water level being dynamically related to said steam flow and feed water flow by a compensated transfer function which comprises the integration modes and unstable modes of behavior included in the overall transfer function relating the transforms of said inputs to the transforms of said outputs, said compensated transfer function having no right half plane zeros; (c) displaying said compensated water level and said water level; and (d) controlling said water level by comparing the compensated water level and the water level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
Specification