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Pacific Gas & Electric Company

Pacific Gas & Electric Company. MTS: Evolution of the Electric Distribution System Manho Yeung, Senior Director, System Planning and Reliability PG&E October 15, 2014. PG&E Distribution System. Service Territory 70,000 square miles with diverse topography

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Pacific Gas & Electric Company

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  1. Pacific Gas & Electric Company MTS: Evolution of the Electric Distribution System Manho Yeung, Senior Director, System Planning and Reliability PG&E October 15, 2014

  2. PG&E Distribution System • Service Territory • 70,000 square miles with diverse topography • 5.5 million electric customers • 2013 peak demand about 21,000 MW • Over 50% of electric supply from non-greenhouse gas emitting facilities Distribution Grid • 3200 distribution lines • 142,000 miles of distribution lines • 1.1 million distribution line transformers • 150,000 fuses • 14,500 voltage devices • 6,900 line reclosers

  3. Integrating DER into the Distribution Grid • Distributed generation is growing exponentiallyDG Adoption • Total installed DG capacity = 1,647 MW • Total installed DG customers = 133,000 • System penetration of DG Capacity = 8% of PG&E system peak demand • 8% of distribution feeders have > 15% penetration* • 3% of distribution feeders have >30% penetration • 1% of distribution feeders have 100% penetration Roof Top Solar • Processing cycle time is 4 days from application complete to Permission to Operate (PTO) • Issued 4,000 PTO notices in August 2014 with a projected 40,000 total for 2014 • No significant distribution upgrades required to date * Penetration defined as installed generation divided by peak demand on feeder

  4. Grid of Things to Integrate DER • The grid, with its many devices, serves as a platform to enable and facilitate the integration of DERs • Protection devices to ensure safety • Devices in RED such as breakers, reclosers, and fuses coordinate with DER protection schemes • Voltage regulation to ensure service quality • Devices in GREENare voltage devices that coordinate with DER load flow • Most PGE feeders have voltage regulated by a substation Load Tap Changer and many have multiple capacitors and tap changing regulators • Conductors and transformers to transmit power • A portion of the feeder is considered “main line” where conductors are large • Tap lines are used to connect customers and further distribute electricity • Line transformers are used to step power down to secondary voltage to serve multi customers • Most of the lines are economically sized for the load that they are serving Line transformer SUB Tap line F fuse F F R F capacitor regulator booster Main line recloser breaker

  5. Need an Intelligent Gridto Integrate DERs • Programs and initiatives that make the distribution grid more intelligent, robust, reliable and affordable for our customers: • Smart Meters • SCADA (supervisory control and data acquisition) • Sensors and monitors to further improve system operations • Volt/VAR optimization to automate voltage regulation and save energy • Smart Inverters • FLISR (fault location isolation and service restoration) feeder automation • Standardizing such as larger conductor and infrastructure replacement for two way flows • Identify optimal locations and target DER (DR, EE, DG, storage) to maximize customer benefits

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