Coordination in multilayer process control and optimization schemes
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G05D-003/12
G05D-005/00
G05D-009/00
G05D-011/00
G05B-013/02
출원번호
US-0292708
(2002-11-12)
발명자
/ 주소
Havlena, Vladimir
출원인 / 주소
Honeywell International Inc.
대리인 / 주소
Fredrick Kris T.
인용정보
피인용 횟수 :
5인용 특허 :
10
초록▼
Loads 1, 2 , . . . , N are controlled by predicting a total energy requirement for the loads 1, 2 , . . . , N at prediction points k=0, 1, 2, . . . , K, by allocating the total energy requirement to the loads 1, 2 , . . . , N at prediction points k=0, 1, 2, . . . , K, by determining a dynamic energy
Loads 1, 2 , . . . , N are controlled by predicting a total energy requirement for the loads 1, 2 , . . . , N at prediction points k=0, 1, 2, . . . , K, by allocating the total energy requirement to the loads 1, 2 , . . . , N at prediction points k=0, 1, 2, . . . , K, by determining a dynamic energy demand requirement for each of the loads 1, 2 , . . . , N at prediction points k=0, 1, 2, . . . , K based on the allocated energy requirements, and by controlling the loads 1, 2 , . . . , N based on the dynamic energy demand requirements.
대표청구항▼
1. A process control system for controlling a load comprising:a predictive controller that predicts an energy requirement for the load at prediction points k =0, 1, 2, . . , K based on a steady state target energy requirement for the load; and,a real time cost optimizer that determines a cost optimi
1. A process control system for controlling a load comprising:a predictive controller that predicts an energy requirement for the load at prediction points k =0, 1, 2, . . , K based on a steady state target energy requirement for the load; and,a real time cost optimizer that determines a cost optimized dynamic energy demand requirement for the load at the prediction points k =0, 1, 2, . . . , K based on the predicted energy requirement and that controls the load based on the dynamic energy demand requirement. 2. The process control system of claim 1 wherein the real time optimizer is arranged to constrain the dynamic energy demand requirement to a limit and controls the load based on the constrained dynamic energy demand requirement. 3. The process control system of claim 2 wherein the limit comprises a maximum limit. 4. The process control system of claim 2 wherein the limit comprises a minimum limit. 5. The process control system of claim 2 wherein the limit comprises a minimum limit and a maximum limit. 6. The process control system of claim 2 wherein the real time optimizer determines ΔF dyn according to the following equation: F dyn =DF dyn −F act wherein D is a (K+1) by (K+1) matrix given by the following equation:and wherein F act is a (K+1) dimensional vector representing an actual energy consumption of the load in the first component and zeros elsewhere as given by the following equation:wherein F dyn is the dynamic energy demand requirement, and wherein ΔF dyn is constrained to a limit. 7. The process control system of claim 6 wherein the limit for ΔF dyn comprises a maximum limit. 8. The process control system of claim 6 wherein the limit for ΔF dyn comprises a minimum limit. 9. The process control system of claim 6 wherein the limit for ΔF dyn comprises a minimum limit and a maximum limit. 10. The process control system of claim 1 wherein the predicted energy requirement is designated F unconstr , wherein the dynamic energy demand requirement is designated F dyn , and wherein F dyn is determined by minimizing a quadratic function based on a difference between F unconstr and F dyn . 11. The process control system of claim 10 wherein F unconstr and F dyn each have dimensions K+1. 12. The process control system of claim 10 wherein the real time controller is arranged to constrain F dyn to a limit and to control the load based on the constrained F dyn . 13. The process control system of claim 12 wherein the limit comprises a maximum limit. 14. The process control system of claim 12 wherein the limit comprises a minimum limit. 15. The process control system of claim 12 wherein the limit comprises a minimum limit and a maximum limit. 16. A process control method for controlling parallel loads 1 , 2 , . . . , N comprising:predicting, in a predictive controller, an energy requirement for each of the loads 1 , 2 , . . . , N at prediction points k=0, 1, 2, . . . , K based on a steady state target allocation for each of the parallel loads 1 , 2 , . . . , N;determining, in a real time optimizer, a dynamic energy demand requirement for each of the parallel loads 1 , 2 , . . . , N at prediction points k=0, 1, 2, . . . , K based on the predicted energy requirements so as to cost effectively allocate load demand among the parallel load 1 , 2 , . . . , N; and,controlling the loads 1 , 2 , . . . , N based on the dynamic energy demand requirements. 17. The process control method of claim 16 wherein the controlling of the loads based on the dynamic energy demand requirements comprises:constraining each of the dynamic energy demand requirements to a corresponding limit; and,controlling the loads 1 , 2 , . . . , N based on the corresponding constrained dynamic energy demand requirements. 18. The process control method of claim 17 wherein the corresponding limits comprise corresponding maximum limits. 19. The process control method of claim 17 wherein the corresponding limi ts comprise corresponding minimum limits. 20. The process control method of claim 17 wherein the corresponding limits comprise corresponding minimum limits and corresponding maximum limits. 21. The process control method of claim 17 further comprising;determining ΔF i dyn according to the following equation: ΔF i dyn =DF i dyn −F i act wherein D is a (K+1) by (K+1) matrix given by the following equation:and wherein F i act is a (K+1) dimensional vector having an actual energy consumption of a corresponding one of the loads in the first component and zeros elsewhere as given by the following equation:wherein i=1, 2, . . . , N designates the loads, wherein F i dyn designate the dynamic energy demand requirements of the loads 1 , 2 , . . . , N, and wherein ΔF i dyn are constrained to corresponding limits. 22. The process control method of claim 21 wherein the corresponding limits for ΔF i dyn comprise corresponding maximum limits. 23. The process control method of claim 21 wherein the corresponding limits for ΔF i dyn comprise corresponding minimum limits. 24. The process control method of claim 21 wherein the corresponding limits for ΔF i dyn comprise corresponding minimum limits and corresponding maximum limits. 25. The process control method of claim 16 wherein the predicted energy requirement for each of the loads 1 , 2 , . . . , N is designated F i unconstr , wherein the dynamic energy demand requirement for each of the loads 1 , 2 , . . . , N is designated F i dyn , wherein F i dyn is determined by minimizing the following quadratic function: f ( F,z )=∥ F dyn −F unconstr ∥ Q(1) 2 +∥z∥ Q(2) 2 with respect to variables F dyn and z, wherein F dyn and F unconstr are vectors each having a dimension 2N(K+1), wherein Q(1) and Q(2) are each square N(K+1) by N(K+1) norm matrices given by the following equations:
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