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Welcome to the EPRI Power Quality Online Resource Center!

This site is provided for the benefit of funders of the EPRI Power Quality Knowledge (PQK) supplemental project. For those seeking to learn more about EPRI PQ Knowledge, please contact me, Bill Howe, Program Manager of Power Quality research for EPRI.

If you are a PQK funder and have not subscribed to this resource center, register today. For more information about subscribing to this site, please contact Bill Howe.

Supplemental Project Opportunities!
PQ Knowledge Development and Transfer 

Management of power quality issues has never been an easy task, but it has grown even more difficult with deregulation, reregulation, increasingly scarce technical and strategic tools, and a conspicuous lack of unbiased resources for information, collaboration, advice, and problem solving. Moreover, with the ever-increasing use of sensitive digital and electronic equipment in today’s economy, end-use customers are not only demanding higher quality power, but also are calling upon utilities to help resolve PQ problems within customer facilities.

This supplemental project offers a number of benefits for members, including leveraging contributions by at least a 20-to-1 ratio, access to EPRI experts and industry peers, access to high-impact resources, such as documents covering a wide range of PQ topics, and access to MyPQ.epri.com, a comprehensive electronic PQ resource providing 24/7 access to more than 500 PQ case studies, PQ technical documents, PQ standards references, indexes, conference presentations, and a wealth of other resources.

Go to the Supplements Page 

The Power Quality Investigator (PQI) Users Group 

The Power Quality Investigator is a software tool that captures EPRI’s vast experience in investigating and solving end-user power quality (PQ) issues in an expert system. Based on 500 person-years of experience and hundreds of facility audits, this expert system allows for expedited and thorough investigation, diagnosis, and documentation of end-use PQ issues. Users can take the PQ Investigator into the field on a laptop or mobile device (either pre-loaded or connected via a web browser) to show customers the causes of and solutions for the PQ problems that they are facing.

This is particularly valuable for the industrial sector, which features a diverse range of processes, equipment, and power quality issues. The tool is useful for solving customer power quality issues and for internal training of engineering and customer support personnel. Benefits of the members of the PQI Users Group include:

  • Access to latest PQ Investigator software releases
  • Quarterly web training on PQ Investigator features
  • Use case findings based on field investigations using the PQ Investigator
  • Access to a collaboration forum for users to inform potential enhancements
  • Software support via telephone and e-mail
  • PQ Investigator Users Group meetings and workshops

The PQ Investigator is an ongoing yearly-based supplemental project that supports, maintains, and develops successive versions and enhancements of the software tool. Participants in the Users Group can join at any time.

Go to the Supplements Page 

Call of the Month for September 2017
Via EPRI’s PQ Knowledge (PQK) Power Quality Hotline, a PQK member inquired about a problem at a residential customer where a clothes-washing machine was causing the house’s lights to flicker during certain portions of the washing cycle. In Part 1 (August 2017), we examined whether adding impedance to the electrical supply to the washing machine would offer any benefits. This PQ Hotline Call of the Month—part two of a two-part series—discusses modeling that was conducted by EPRI to understand the effects of increasing the size of the service conductors to the residence. The hope was that having a stiffer electrical supply might ameliorate the level of lighting flicker without requiring modifications to the appliance.
Year-at-a-Glance Calendar for Program 1 Activities

Click Here to View the 2017 P1 Calendar

White Paper on Advanced Settings for Distributed Energy Resources

The EPRI White Paper titled Recommended Settings for Voltage and Frequency Ride-Through of Distributed Energy Resources  discusses the implications of recommended advanced settings of distributed energy resources to support power quality, reliability, and the grid.

EPRI Industrial PQ Training Videos

As a follow-up to our Industrial Power Quality training classes, we have posting these complementary training videos to help solidify the concepts for both the utility members and their customers.

Video 1: Visualizing PQ Drive Parameters for Improved Voltage Sag Ride-Through 
This video demonstrates the voltage sag susceptibility of AC drive systems and how to improve the drive’s robustness through parameter changes.

Video 2: Understanding PLC Voltage Sag Ride-through: AC and DC Powered Systems 
This video demonstrates the differences in voltage sag ride-through between an AC powered PLC system and a DC Powered PLC system.

Video 3: Power Conditioning to Enhance Control System Voltage Sag Ride-Through: The Constant-Voltage Transformer 
This video shows how a CVT can be utilized to harden the voltage sag response of an automated control system.

PQ News Builder

For EPRI PQ Knowledge funders, we have created a tool that enables you to download articles related to power quality, including high-resolution images for printing or PDF file. You can select articles on a variety of topics from our Power Quality Database and download content in HTML or RTF format, which opens in Microsoft Word.

Start Collecting PQ Articles