Location: Texas A&M University, College Station, TX
Course Faculty: J. Soward – TU Electric, W. Gray – Toshiba Industrial Systems, A. Jakwani – Current Technology, P. Enjeti, A. Abur, C. Singh of TAMU
| Brochure in PDF format |
|
Introduction:
With the increased use of nonlinear loads in the industry, customer owned computers and other sensitive electronic circuitry, Electric Power Quality has become vitally important. In particular harmonic distortion of voltages and currents can be generated either external or internal to an industrial or commercial facility.
In the present era of utility deregulation and competition, many utility and industrial customers are concerned about reliability of electrical supply and quality of power. The likelihood of power interruptions and voltage fluctuations and means of eliminating them or minimizing their effects have assumed greater importance.
This three-day course will expand on methods of analysis and provide hands-on introduction to computer tools for solving power quality problems. Course presentations presume no familiarity with basic power quality issues. Prior knowledge of computer programs for the analysis of voltage disturbances is not required.
Who should attend
Electric utility distribution and customer service engineers responsible for quality of power supply to critical customers will benefit by attending this course. Plant electrical engineers in locations having power electronic equipment, adjustable speed drives, or critical and sensitive loads, including computers and process control equipment, will likewise find this course helpful. The course will also be valuable to building designers, facility managers, equipment manufacturers, consultants, and senior technical personnel in electrical construction companies.
Unique Features and Benefits
Attendees will have the opportunity to use the state of the art power quality monitoring instruments and various waveform distortion generators in TAMU's recently established power quality laboratory. They will also be using simulation software installed in the computer laboratory in order to analyze voltage sags, transient overvoltages and harmonics. After attending this course participants will have a better understanding of electric power quality, cause and effects of harmonics, transients such as voltage sags, interruptions, overvoltages. Reliability issues related to poor power quality, as well as power quality problems in electrical systems of buildings will be also covered.
The computer exercises will provide a unique hands on experience in simulating an example system, computing distortion limits and recommending and evaluating likely solutions to power quality problems using popular software such as EMTP/ATP, Pspice and Matlab.
Day # 1
8.00 am - John Soward, Power Quality Manager, TU - Electric
Introduction: What is Electric Power Quality?
 | Utility perspective< !--mstheme--> |
| Classification of Po wer Quality issues |
| Definition of terms and standards. |
10.00 am - Mr. Will Gray, Toshiba Industrial Systems
Power Quality Problems in Industrial Power Distribution Systems
| Power Quality – Industry perspective |
| Power Quality, Adjus table Speed AC Drives and harmonic compliance |
12.00 – Lunch
1.00 PM – P. Enjeti and A. Abur
Definition of terms and Review:
| Review of power qual ity standards (IEEE 519-1992 etc.) |
| Harmonic current and voltage distortion limits – discussion |
| Measurement of volta ge sags: National power quality survey data from distribution systems, Characterization of voltage sag parameters |
| Equipment sensitivit y : Examples of equipment sensitivity to sags, CBEMA equipment tolerance curve, Proposed new CBEMA curve, Area of vulnerability concept |
| Identify key system components to model the system and determine the field data required: Utility short circuit kVA, Transformer ratings, Feeders, Linear and nonlinear loads, Existing capacitor banks / harmonic filter |
3.00 PM –P. Enjeti and A. Abur
Laboratory Exercises & Demonstrations
Introduction to the power quality laboratory. Hands on experience in generating a voltage sag, voltage unbalance, distortion, flicker and short term power interruption on a 54kVA programmable power source.
5.00 PM Adjourn
Day # 2
Power Quality Problems in Electrical Systems in Buildings
| Review of nonlinear loads in a typical building |
| Excessive neutral cu rrent problem, voltage distortion |
| Case study of typica l loads in buildings |
| Computer modeling of a electrical distribution system in buildings |
| Determining transfor mer derating and K – factor calculation |
| Review of passive an d active filtering methods to reduce neutral current overloading and improve voltage THD |
| Transient surge supp ression methods in Buildings – a typical case study |
11.00 am - A. Abur, Texas A&M University
Voltage Sags and Interruptions
| Review of voltage sa g phenomena: IEEE STD. 519-1992 definitions |
| Measurement of volta ge sags: National power quality survey data from distribution systems, Characterization of voltage sag parameters |
| Modeling and simulat ion of utility systems for voltage sag and interruption studies |
| Solutions to voltage sag events : Power conditioning for sensitive load equipment Advanced solution technologies: DVR, static transfer switch & dual feed, battery and superconducting energy storage |
12.00 – Lunch
1.00 pm - A. Abur, Texas A&M University
Transient Overvoltages
| Review of capacitor switching transients |
| Modeling and simulat ion of transient overvoltages: Assessing the effects of capacitor switching |
1.30 pm - A. Abur, Texas A&M University
Harmonics
| Sources and effects of harmonics |
| Harmonic analysis: F requency and capacitor scans |
| System modeling for harmonics studies |
| Harmonic power flow studies |
| Harmonics mitigation : use of passive filters |
| Harmonics standards and compliance studies |
2.30 pm – P. Enjeti, A. Abur
Computer Exercises & Laboratory Demonstrations
| Computer Modeling of a typical system |
| Review system impeda nce/ frequency scans |
| Investigate the impa ct of system capacitors |
| Meet IEEE limits by applying harmonic filters |
| Harmonic Case study |
| Case study - Effect of voltage sag on a Electronic Adjustable Speed Drive systems and some solutions. |
| Measurement of harmo nics generated by an adjustable speed drive and evaluate the effects of voltage sags on the drive performance (Lab demonstration) |
Day # 3
8.00 am – C. Singh, Texas A&M University
Reliability in the Presence of Poor Power Quality for Industrial & Commercial Distribution Systems
| Due to increased com petitiveness, many systems are being operated closer to their limits, and the voltage sags/swell transients and reliability of equipment is becoming an important issue. A brief review of basic reliability analysis techniques along with examples will be presented. |
| Case Study of a typi cal power distribution system of a telecommunication facility: determine the choice of single vs. dual feed, bus configuration, UPS selection guides, overall configuration for continuity and quality of power supply |
10.30 am – Adjourn
The Course Textbook
Included in the course fee is a copy of a new textbook, Electrical Power Systems Quality, by Roger C. Dugan, Mark F. McGranaghan and H. Wayne Beaty, McGraw-Hill, 1996. Additional course handouts for specific course topics will be provided.
|
Send mail to xuxj@ee.tamu.edu with questions or comments about this web site.
|