Possible approach to control of multi-variable control loop by using tools for determining optimal control pairs

Abstract

The paper describes one of possible approaches to control of multi-variable control loops. In the proposed approach to control is used the so called RGA (Relative Gain Array) tool and also RNGA (Relative Normalized Gain Array) tool, further the correction members, the auxiliary controllers and simple approach to a design of the primary controllers. The RGA tool and also the RNGA tool serve to determine the optimal input-output variable pairings in a multi-variable controlled plant. Correction members are generally considered for ensuring invariance of control loop. Auxiliary controllers are considered to ensure at least partial decoupling control loop. Further, it is considered that the primary controllers are determined by arbitrary single-variable synthesis method for optimal input-output variable pairings. Simulation verifications of the mentioned way of control are carried out for three-variable controlled plant of a steam turbine.