Control system and control method for cogeneration system

Abstract

A control system for cogeneration system provides operation combination calculating means which calculates the combination of operations capable of keeping the voltage of the distribution line within a predetermined tolerance within voltage tolerance based on following (1)-(3). (1) the predicted value of the electric power demand of each customer calculated by electric power demand predicted value calculating means; (2) the impedance of the distribution line recorded by distribution line information recording means; and (3) the combination of cogeneration systems to be operated, as calculated by operation combination calculating means.

1 . A control system for cogeneration system for supplying customers with electric power and heat, and controlling a plurality of cogeneration systems connected to a distribution line, said control system comprising: 
 electric power demand predicted value calculating means for calculating the predicted value of the electric power demand for each of said costumers;    distribution line information recording means for recording the impedance of said distribution line;    operation priority calculating means for calculating the priority of operation based on the amount of the hot water stored by a customer or the demand for hot water;    operation combination calculating means for calculating the combinations of cogeneration systems to be operated according to said operation priority calculating means; and    operation combination calculating means within voltage tolerance that calculates the combination of operations capable of keeping the voltage of the distribution line within a predetermined tolerance, based on the predicted value of the electric power demand of each customer calculated by said electric power demand predicted value calculating means, the impedance of the distribution line recorded by said distribution line information recording means, and the combination of cogeneration systems to be operated, as calculated by said operation combination calculating means.    
   
   
       2 . The control system for cogeneration system described in  claim 1 , wherein said operation priority calculating means assigns a high priority to the cogeneration system wherein the amount of stored hot water is smaller or the demand for hot water is higher.  
   
   
       3 . The control system for cogeneration system described in  claim 1 , wherein said operation combination calculating means within voltage tolerance comprises the steps of: 
 calculating the distribution line voltage when the operation is performed by the combination of the cogeneration systems to be operated, as calculated by said operation combination calculating means, wherein said step of calculating the distribution line voltage is based on the impedance of the distribution line recorded by said distribution line information recording means; and    calculating a combination of operations wherein the calculated voltage is kept within a predetermined tolerance.    
   
   
       4 . The control system for cogeneration system described in  claim 1 , wherein said electric power demand predicted value calculating means calculates the predicted value for electric power demand of each customer, based on the meteorological information during the period under control and statistic information on the past electric power demand.  
   
   
       5 . A control system for cogeneration system for supplying customers with electric power and heat, and controlling a plurality of cogeneration systems connected to a distribution line, said control system comprising: 
 electric power demand predicted value calculating means for calculating the predicted value of the electric power demand for each of said costumers;    distribution line information recording means for recording the impedance of said distribution line;    operation priority calculating means for calculating the priority of operation based on the amount of the hot water stored by a customer or the demand for hot water;    operation combination calculating means for calculating the combinations of cogeneration systems to be operated according to said operation priority calculating means;    operation combination calculating means within voltage tolerance that calculates the combination of operations capable of keeping the voltage of the distribution line within a predetermined tolerance, based on the predicted value of the electric power demand of each customer calculated by said electric power demand predicted value calculating means, the impedance of the distribution line recorded by said distribution line information recording means, and the combination of cogeneration systems to be operated, as calculated by said operation combination calculating means; and    control means for controlling the amount of electric power produced by each cogeneration system, based on the combination of operations wherein the voltage of the distribution line calculated by said operation combination calculating means within voltage tolerance is kept within a predetermined tolerance.    
   
   
       6 . The control system for cogeneration system described in  claim 5 , wherein said operation priority calculating means assigns a high priority to the cogeneration system in which the amount of stored hot water is smaller or the demand for hot water is higher.  
   
   
       7 . The control system for cogeneration system described in  claim 5 , wherein said operation combination calculating means within voltage tolerance comprises the steps of: 
 calculating the distribution line voltage when the operation is performed by the combination of the cogeneration systems to be operated, as calculated by said operation combination calculating means, wherein said step of calculating the distribution line voltage is based on the impedance of the distribution line recorded by said distribution line information recording means; and    calculating a combination of operations wherein the calculated voltage is kept within a predetermined tolerance.    
   
   
       8 . The control system for cogeneration system described in  claim 5 , wherein said electric power demand predicted value calculating means calculates the predicted value for electric power demand of each customer, based on the meteorological information during the period under control and statistic information on the past electric power demand.  
   
   
       9 . A control method for cogeneration system for supplying customers with electric power and heat, and controlling a plurality of cogeneration systems connected to a distribution line, said cogeneration system control system comprising: 
 electric power demand predicted value calculating procedure for calculating the predicted value of the electric power demand for each of said costumers by means of computing means;    distribution line information recording means for recording the impedance of said distribution line;    operation priority calculating procedure for calculating the priority of operation by means of computing means, based on the amount of the hot water stored by a customer or the demand for hot water;    operation combination calculating procedure for calculating the combinations of cogeneration systems to be operated, by means of computing means according to said operation priority calculating means;    operation combination calculating procedure within voltage tolerance that calculates the combination of operations capable of keeping the voltage of the distribution line within a predetermined tolerance, based on the predicted value of the electric power demand of each customer calculated by said electric power demand predicted value calculating means, the impedance of the distribution line recorded by said distribution line information recording means, and the combination of cogeneration systems to be operated, as calculated by said operation combination calculating means; and    control means for controlling the amount of electric power produced by each cogeneration system, based on the combination of operations wherein the voltage of the distribution line calculated by said operation combination calculating means within voltage tolerance is kept within a predetermined tolerance.    
   
   
       10 . The control method for cogeneration system described in  claim 9 , wherein said operation priority calculating means assigns a high priority to the cogeneration system wherein the amount of stored hot water is smaller or the demand for hot water is higher.  
   
   
       11 . The control method for cogeneration system described in  claim 9 , wherein said operation combination calculating procedure within voltage tolerance comprises the steps of: 
 calculating the distribution line voltage when the operation is performed by the combination of the cogeneration systems to be operated, as calculated by said operation combination calculating procedure, wherein said step of calculating the distribution line voltage is based on the impedance of the distribution line recorded by said distribution line information recording procedure; and    calculating a combination of operations wherein the calculated voltage is kept within a predetermined tolerance.    
   
   
       12 . The control method for cogeneration system described in  claim 9 , wherein said electric power demand predicted value calculating procedure calculates the predicted value for electric power demand of each customer, based on the meteorological information during the period under control and statistic information on the past electric power demand.