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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.

Program 1 Cockpit

The Program 1 cockpit at the EPRI Member Center contains the Program 1 Collaboration site as well as information about ongoing and planned research projects (and their status), project sets, supplemental projects, documents related to power quality, announcements, meetings and webcasts, and training.

Visit the Program 1 Cockpit 

Supplemental Project Opportunities!
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 April 2019
Via EPRI’s PQ Knowledge (PQK) Power Quality Hotline, a PQK member asked about surge protection. Specifically, the member wanted to know what determines “clamping voltage” and “clamping time”? This Power Quality Hotline Call of the Month includes basic information about surge protectors as well as information about the four main parameters of surge protectors: maximum continuous operating voltage, voltage-protection rating, short-circuit current rating, and nominal discharge current.
Most Popular PQ Documents (Based on Clicks)
  1. ASD Ride-Through Methods Using Built-in Code Parameters
  2. 05/03/2017 Hotline Call About Measurements
  3. Energization of PV Transformers Causes DC Drives to Shut Dow ...
  4. The Effects of High and Low Steady-State Voltages on End-Use ...
  5. Calculating Sag Magnitude Through a Series of Transformer Co ...
P1 Update

The P1 Update keeps members of Program 1 abreast of projects, supplemental projects, and other activities in the program, including a year-at-a-glance calendar.

Download the P1 Update 

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 posted 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.

Video 4: IEEE Standard 1668 
This video provides an overview of the IEEE Std. 1668, Recommended Practice for Voltage Sag and Short Interruption Ride-Through Testing for End-Use Electrical Equipment Rated Less than 1000 V.

Video 5: Power Conditioning with Dip-Proofing Inverters (DPIs) 
This video demonstrates the application and effectiveness of the capacitor-based dip-proofing inverter (DPI)

Video 6: Power Conditioning with “Nice” Cube Relays) 
This video demonstrates the susceptibility of the common ice-cube relay and the application of the "Nice Cube" relay solution.

Video 7: Power Conditioning with MiniDySC Systems 
This video shows how the Mini Dynamic Sag Corrector (MiniDySC) can be utilized to harden the voltage-sag response of an automated control system.

Video 8: Power Quality Mitigation Technologies 
When equipment is identified as sensitive to variations in power quality, what may be done to mitigate this sensitivity? This video explains various approaches.

Video 9: Power Conditioning with the Voltage Dip Compensator (VDC) 
This video demonstrates the application and effectiveness of the fast transformer tap-changing device called the voltage dip compensator (VDC).

Open PQ Dashboard Version 2.0

Version 2.0 of the Open PQ Dashboard is now available at the following link: