Variable Frequency Drive Test Results

Slides:



Advertisements
Similar presentations
Chapter 4 Three-Phase Motors
Advertisements

Modeling Electrical Systems With EMTP-RV
Experiment 17 A Differentiator Circuit
Siemens Building Technologies Building Technologies Variable Frequency Drives Harmonics Overview.
SYNCHRONOUS GENERATORS
EXCITATION SYSTEM.
Power Electronics Chapter 6 AC to AC Converters ( AC Controllers and Frequency Converters )
Copyright by UNIT III DC Choppers 4/17/2017 Copyright by
EPANET FOR PRESSURIZED PIPE SYSTEMS
Chapter 4 AC to AC Converters
Lesson 19: Non-Linear Operation of Dc Motors ET 332a Dc Motors, Generators and Energy Conversion Devices 1Lesson a.pptx.
MOS Inverter: Static Characteristics
ET 332a Dc Motors, Generators and Energy Conversion Devices 1Lesson a.pptx.
Experiment 17 A Differentiator Circuit
Static Pressure Control Loop The purpose of the static pressure control loop is to maintain an optimal static pressure in the ductwork. The control loop.
Black Box Electronics An Introduction to Applied Electronics for Physicists 2. Analog Electronics: BJTs to opamps University of Toronto Quantum Optics.
Motors in Power System Dynamics Studies John Undrill NATF - Dallas - June 2015.
Regal Beloit Proprietary & Confidential What do I get? The X13 motor is a permanent magnet, three phase,brushless DC motor. A single phase drive is attached.
1 Chapter 8: Procedure of Time-Domain Harmonics Modeling and Simulation Contributors: C. J. Hatziadoniu, W. Xu, and G. W. Chang Organized by Task Force.
ECE 576 – Power System Dynamics and Stability Prof. Tom Overbye Dept. of Electrical and Computer Engineering University of Illinois at Urbana-Champaign.
EE1301/POWER ELECTRONICS AC voltage controller and cycloconverter
Lecture 7: State-Space Modeling 1.Introduction to state-space modeling Definitions How it relates to other modeling formalisms 2.State-space examples 3.Transforming.
Comparison Between AM and FM Reception. 21/06/20162 FM Receiver.
NERC LMTF: Current Activities Ryan Quint, PhD, PE Staff Coordinator, NERC Load Modeling Task Force WECC MVWG Meeting June 2016.
Lesson 12a: Three Phase Induction Motors
A Field Construction Technique to Efficiently Model the Dynamic Vector Forces within Induction Machines Dezheng Wu, Steve Pekarek School of Electrical.
Energy Efficient Motors and Variable Speed Drives
Modeling DER in Transmission Planning CAISO Experience
Lesson 16: Basic Control Modes
Components Motors and Generators.
Electronic Devices Ninth Edition Floyd Chapter 14.
Components Motors and Generators.
Benchmarking WECC Composite load model
PSCAD models.
Branch:- Electrical (09)
WECC Load Modeling and Validation Group Meeting
IPC (GROUP-5) SR. NO NAME EN. NO 1 SAVAN PADARIYA
Electromechanical Motor Control
Variable Frequency Drive Test Results
HVAC Test results Anish Gaikwad Parag Mitra
BPA Air Conditioner Test Results
Next Steps in Load Modeling
AC to DC Converters Outline 2.1 Single-phase controlled rectifier
Dr. Zainal salam; Power Electronics and Drives (Version 2),2002, UTMJB
DC- AC CONVERTER-INVERTER
Feedback Amplifiers.
Transistor Circuit Design Diode Approximations Heathkit EB-6002.
POWER SYSTEM ANALYSIS INTRODUCTION.
BPA HQ Power Electronic Load Estimation
Advanced Power Systems
Bernie Lesieutre UW-Madison
Chapter 6 Feedback Circuits
Lesson 11: Transducer Electrical Interfaces
Dynamic Load Modelling
Autonomous Cyber-Physical Systems: Dynamical Systems
CMPLDWG Composite Model with Distributed Generation Approval
AC voltage controller and cycloconverter
BPA/GE Load Model Improvements Project
HVAC Test results Anish Gaikwad Parag Mitra
Composite Load Model with Distributed Generation (CMPLDWG)
VFD and HVAC testing update
BPA HQ Power Electronic Load Estimation
CMPLDWG Composite Model with Distributed Generation Approval
Bernie Lesieutre UW-Madison
WECC Load Modeling and Validation Group Meeting
User Experience with New Solar PV Models California ISO
Chapter 3 Modeling in the Time Domain
N-port Network Port reference Line Impedance Port Voltage & Current.
CHAPTER 59 TRANSISTOR EQUIVALENT CIRCUITS AND MODELS
Frequency response I As the frequency of the processed signals increases, the effects of parasitic capacitance in (BJT/MOS) transistors start to manifest.
Presentation transcript:

Variable Frequency Drive Test Results Anish Gaikwad Deepak Ramasubramanian WECC LMTF Meeting Salt Lake City, UT 3 Oct 2017

VFD Testing - Aim and Motivation At present, for dynamic simulation, power electronic load is represented as constant P and constant Q, with the value of P&Q decreased linearly to zero between two voltage levels. It is possible that such a representation is unable to capture the true transient behavior of a variable frequency drive. As a result, due to the increasing proliferation of these devices in the distribution system, it is important to understand the behavior of the drive and ensure improved model representation for stability studies.

VFD Testing Lab tests are being conducted on drives from different manufacturers with voltage rating of 3 phase 480V and/or 240V (line-line) and power rating from 7.5 HP to 125 HP. The load on the motor is presently variable torque (torque vs speed).

VFD Testing The performance of the drive is measured for a 3ph voltage sag of various magnitude and duration such as: Depth Duration 0.95pu 120 cycles 0.9pu 0.85pu 0.8pu 0.75pu 0.7pu 8 cycles ⁞ 0.5pu 120 cycles or until trip 0.2pu

Present Status Preliminary tests have been conducted on three 30 HP drives from two manufacturers and one 60 HP drive. Simultaneously, the results of the tests are being processed and compared to identify trends, patterns and distinguishing characteristics that will aid in model development. The test data will be used to develop better characterization of VFDs for bulk power system stability studies.

Basic theory of operation of front end of the drive Vac Vdc Input Current, Active Power Output Current, Active Power Vac Vdc Input Current, Active Power Output Current, Active Power Tick-tock Input Current, Active Power Output Current, Active Power Auto restart enabled

Trip time for three drives tested Different time characteristics for each drive Low voltage sag doesn’t necessarily mean trip Trip region

Transient response for rectangular voltage sag to 0.8pu Constant power consumption after transient Significant transient behavior on individual basis

Transient response for rectangular voltage sag to 0.7pu Zero power consumption even if drive doesn’t trip Voltage thresholds in present model set as 0.7pu and 0.4pu

Transient response for rectangular voltage sag to 0.6pu Varied time thresholds across all drives tested Voltage thresholds in present model set as 0.7pu and 0.4pu Linear decrease in power of present model captures to some extent both power reduction due to trip and power reduction due to lower ac side voltage

Key Takeaways In the immediate aftermath of the voltage sag, drive power consumption has transient response In the existing model, this transient cannot be captured Transient is more pronounced in real power Drives operate typically close to unity power factor Existing default trip settings for power electronics load are 0.7 pu (upper) and 0.4 pu (lower) Initial tests indicate that drives may not trip even at 0.2 pu The voltage level(s) at which the drive trips has an associated time component. The existing model has a hard voltage dropout threshold The out-of-box default settings and characteristics of drives of different makes, can be vastly different. The test behavior is of an individual drive. Behavior of aggregate model could reduce the effect of the transients?

Is the present algebraic model sufficient? Questions to ponder.. Is the present algebraic model sufficient? Pro: Easy to parameterize Con: Transients are not adequately captured Is a piecewise algebraic model required? Pro: Sufficiently easy to understand Con: Could introduce numerical issues in simulation; could be tedious to implement in software Is a one/two differential equation model better? Pro: Easy to capture approximate transient behavior; easy to implement in software Con: Could be tedious to construct the correct equation and parameterize it. For drive connected loads of larger rating, is a detailed model required?