Abstract

This paper will present actual use cases of batch analysis technology using PG&E's Batch Analysis Tool (BAT) on gas distribution systems. This paper supplements the PG&E paper Pipeline Simulation Modeling Advancements - Numerous Scenarios Analyzed Simultaneously.

PG&E Distribution and Transmission Planning Engineers use the BAT for a variety of functions. This paper will examine the details of specific distribution focused use cases and consider future applications for the BAT. The use cases that will be examined include:

  • Analysis of various distribution operations required to support a transmission outage impacting the distribution system

  • Analysis and validation of model performance

  • Creation of system performance curves for various operating configurations

System intelligence, operational optimization, and efficiency of analyses will be demonstrated.

Overview of the Distribution Batch Analysis Tool

Purpose

As discussed in PSIG paper 1613 Pipeline Simulation Modeling Advancements - Numerous Scenarios Analyzed Simultaneously, the volume of hydraulic simulations performed by Gas System Planning has dramatically increased due to an unprecedented increase in the amount of reliability work across PG&E's service territory. This has resulted in a substantial workload increase for Planning Engineers. In order to keep pace with this increased workload and provide complete and comprehensive hydraulic analyses, PG&E's Gas System Planning has developed a Batch Analysis Tool (BAT). This is an Excel® based tool that allows for user defined batch simulations of hydraulic models. This tool enables Planning Engineers to set up a series of simulations to be performed in an automated, sequential order rather than manually performing each simulation one at a time. This allows Gas System Planning to devote more time to evaluating hydraulic analysis results and gaining system intelligence, rather than performing simulations manually.

When conducting a hydraulic analysis, multiple input parameters influence a system's performance. For example, during a system outage analysis, the system will perform differently depending on various factors including the specified ambient temperature, the system's operating pressure, valving operations, etc. If every possible combination of these parameters were to be examined, the total number of simulations would increase geometrically. Performing an analysis of this magnitude manually would require a significant amount of time. The BAT allows the Planning Engineer to examine and vary each of these parameters, creating simulations ranging from 10 runs to thousands of runs, if desired. Performing such detailed analysis is both comprehensive and time efficient.

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