9416 – Adaptive Subband Compression for Power System Monitoring and Control

Phasor measurement unit (PMU)subband codingadaptive data compression
  • Phasor measurement unit (PMU)
  • subband coding
  • adaptive data compression

Abstract:

An adaptive compression technique has been developed to enable high-resolution streaming of continuous point-on-wave data of the power grid measurements using the existing infrastructure of wide-area monitoring systems (WAMS). This technique allows monitoring transient instabilities and fast-timescale anomalies that current methods cannot detect and report.

Technology Overview:

Large-scale integration of inverter-based renewable resources has resulted in increasing outages in power systems caused by fast timescale anomalies such as frequency excursion, transient instability, and voltage collapse. The state-of-the-art synchrophasor measurement unit (PMU) technology has limited coverage. The data resolution at less than 240 frames per second is inadequate to address power electronics-induced fast signal dynamics. Existing fast-timescale high-resolution measurements within the monitoring and protection systems are only used for offline post-event analysis. Researchers at Cornell University have devised a novel data compression technique that enables real-time streaming of high-resolution continuous point-on-wave (CPOW) samples at the rate of up to 200 kilo-Hertz within the existing infrastructure of wide-area monitoring systems. As the first technique for compressing high-resolution CPOW measurements, the developed adaptive subband compression (ASBC) technology provides a 100:1 to 1000:1 compression ratio. ASBC employs low-cost filter-banks that decompose measurement data streams based on the harmonic structure of the signal waveforms and adaptively compress individual harmonic components. A prototype implementation of ASBC offers a 40-50 dB improvement in the rate-distortion performance metric.

Advantages:

  • Real-time situational awareness at the millisecond timescale and enhanced network resilience.
  • High-fidelity and high-resolution data-streaming with existing WAMS infrastructure.

Potential Applications:

  • Upgrade existing phasor measurement units.
  • Monitoring the fast dynamics of a power system.
  • Coordinated protection relay

Contact Information:

Nombre: Ryan Luebke

Correo electrónico: rtl77@cornell.edu

Teléfono: 607-254-4483