CASCADE CONTROL FOR SETTING OF REQUIRED AVERAGE VALUE OF PROCESS PARAMETER Russian patent published in 2009 - IPC G05B13/02 

FIELD: physics, control.

SUBSTANCE: invention is related to multi-level controller that controls operation of system, which performs technological process. Process has multiple process parameters (MPP): one of MPP is controlled process parameter (CTPP) and one of MPP is target process parameter (TPP); and designated target value (DTV), which represents the first limit of actual average value (AAV) of TPP in preset period of time with duration TPL_AAV2. AAV and is calculated on the basis of actual values (AV) of TPP in preset period. The first logic controller predicts future average values (FAV) of TPP for the first future time period (FFTP), which has duration TPL_AAV2 and starts from the current moment of time T₀ to the future moment of time TPL_AAV2, before which TPP switches over to steady mode. FAV are predicted on the basis of (i) AAV TTP in different moments of time in the first preceding time period (FPTP) with duration of at least TPL_AAV2, which continues from preceding time TPL_AAV2 to current time T₀, (and) current values of MPP, and (iii) DTV. The second logic controller sets additional target value (FTV), which represents the second limit of AAV TTP for the second future time period (SFTP), which has duration equal to TPL_AAV2, which is less than duration TPL_AAV2, and starts from current time T₀ to future time TPL_AAV1. FTV, being established on the basis of one or more predicted FAV TPP in FFTP.

EFFECT: higher efficiency of system operation control.

24 cl, 28 dwg, 3 tbl