Reliability calculation for Substation Automation systems
View Patent ↗A method and device automatically extract, to a maximum extent, reliability-relevant information from a Substation Configuration Description (SCD) file describing an electric power transmission or distribution substation. The information in the SCD file is used to identify the physical topology of a communication network of a Substation Automation (SA) system, and all dataflow relating to a given SA functionality or Logical Node (LN). An LN reliability measure for the latter is calculated, involving reliability indications specific to each element or device participating in the dataflow. A number of LN reliability measures are consolidated to produce an overall reliability for the SA system architecture or communication network topology. The method and tool minimize the engineering effort required to perform a reliability calculation, and thus allow comparing the reliability of different SA architectures with minimal effort and intervention of a reliability engineer.
1. A method of calculating a reliability of a Substation Automation (SA) system for a substation with a plurality of substation devices and substation communication elements, the method comprising:
identifying a plurality of substation devices for performing a first SA functionality;
calculating, in a processor of a computer processing device, a reliability of the SA system based on a reliability of the identified substation devices;
identifying, from a standardized configuration representation of the SA system including logical data flow definitions of the first SA functionality, a physical data flow path and corresponding substation communication elements enabling data flow related to the first SA functionality;
providing a reliability indication for each identified substation communication element;
calculating, in the processor, based on the provided reliability indications, a reliability of the identified physical data flow paths related to the first SA functionality;
calculating, in the processor, a reliability for the first SA functionality based on the reliability of the identified physical data flow paths;
calculating reliabilities for further SA functionalities having identified physical data flow paths; and
calculating the reliability of the SA system based on the corresponding reliabilities for the first and further SA functionalities.
2. The method of claim 1 , comprising:
analyzing the physical data flow paths based on fault trees.
3. The method of claim 1 , comprising:
providing the reliability indication for each identified substation communication element from a memory external to the standardized configuration representation of the SA system.
4. The method of claim 1 , comprising:
manually specifying any redundant data flow between the elements.
5. The method of claim 1 , comprising:
calculating an SA reliability for each of a plurality of distinct SA system architectures for the substation, and comparing the plurality of calculated SA reliabilities.
6. A device for calculating a reliability of a Substation Automation (SA) system for a substation with a plurality of substation devices and substation communication elements, comprising:
computing means for identifying, from a standardized configuration representation of the SA system including logical data flow definitions of a first SA functionality, a physical data flow path and corresponding substation communication elements enabling data flow related to the first SA functionality;
memory means for storing a reliability indication for each identified substation communication element; and
computing means for calculating, based on the reliability indications from the memory means, a reliability of the identified physical data flow paths related to the first SA functionality, and for calculating a reliability of the SA system based on the reliability of the identified physical data flow paths related to the first SA system functionality, for calculating a reliability for the first SA functionality based on the reliability of the identified physical data flow paths, for calculating reliabilities for further SA functionalities having identified physical data flow paths, and for calculating the reliability of the SA system based on the corresponding reliabilities for the first and further SA functionalities.
7. A non-transitory computer-readable recording medium having a computer program recorded thereon that causes at least one processor of a computer processing device to calculate a reliability of a Substation Automation (SA) system for a substation with a plurality of substation devices and substation communication elements, the computer program causing the at least one processor to execute operations comprising:
identifying a plurality of substation devices for performing a first SA functionality;
calculating a reliability of the SA system based on a reliability of the identified substation devices;
identifying, from a standardized configuration representation of the SA system including logical data flow definitions of the first SA functionality, a physical data flow path and corresponding substation communication elements enabling data flow related to the first SA functionality;
providing a reliability indication for each identified substation communication element;
calculating based on the provided reliability indications, a reliability of the identified physical data flow paths related to the first SA functionality;
calculating a reliability for the first SA functionality based on the reliability of the identified physical data flow paths;
calculating reliabilities for further SA functionalities having identified physical data flow paths; and
calculating the reliability of the SA system based on the corresponding reliabilities for the first and further SA functionalities.
8. The non-transitory computer-readable recording medium of claim 7 , wherein the computer program causes the at least one processor to execute operations comprising:
analyzing the physical data flow paths based on fault trees.
9. The non-transitory computer-readable recording medium of claim 7 , wherein the computer program causes the at least one processor to execute operations comprising:
providing the reliability indication for each identified substation communication element from a memory external to the standardized configuration representation of the SA system.
10. The non-transitory computer-readable recording medium of claim 7 , wherein the computer program causes the at least one processor to execute operations comprising:
manually specifying any redundant data flow between the elements.
11. The non-transitory computer-readable recording medium of claim 7 , wherein the computer program causes the at least one processor to execute operations comprising:
calculating an SA reliability for each of a plurality of distinct SA system architectures for the substation, and comparing the plurality of calculated SA reliabilities.