Power Quality: A Nonlinear Adaptive Filter for Improved Power System Operation and Protection

1
Power Quality A Nonlinear Adaptive Filter for
Improved Power System Operation and Protection
Power Systems

• Research Overview
• Focuses on the application of a new algorithm to
  improve power system operation
• Power quality issues of concern
• Need for voltage amplitude, frequency and phase
  matching, to ensure proper integration
• Need for real-time tracking of these parameters
• Nonlinear Filter Algorithm Summary
• Non-linear, adaptive
• Capable of tracking amplitude, phase and
  frequency of a sinusoid in real time
• Work in Progress Applications to renewable
  energy in the following applications
• Grid integration
• Voltage Control
• Frequency control
• Sag Analysis
• Active Filtering

2
Power Systems
Algorithm
Sag Analysis

• Matlab implementation
• Capable of tracking amplitude A(t), phase and
  frequency of a sinusoid in real time

• Application to Sag Detection
• Faster response than current methods of Fourier,
  RMS and peak voltage
• Suitable when mitigation is required

3
Dips Classification using Wavelets

• Background
• Most power quality standards consider only
  magnitude and duration when classifying dips,
  e.g., IEC-61000-4-11, NRS04822004
• Inadequate definition considering that certain
  drives are also sensitive to voltage changes
• Some classification algorithms tested in South
  Africa resulted in a worst case accuracy of 50-80

• Research Objectives
• Devise a new classification algorithm using
  Wavelet Theory and Pattern Recognition Techniques

4
Impacts of Alternate Energy Sources on Power
Systems Stability
Power Systems

• Research Objectives
• Recommend appropriate models of wind and solar
  systems for reliability and security studies
• Run computer simulations of wind and solar
  systems to access their impacts on power systems
  reliability and security
• Validate simulations results using Real Time
  Power System Simulator (RTPS)
• Model a small Eskom network (e.g., Western Cape)
  to assess the impact of these sources on the
  systems reliability and security using RTPS
• Validate models with measurements