AIS spol. s r.o. Measuring and information technology for power engineering

POWER GRID STABILITY

Features:

• Continuous evaluation of network stability from the following point of view:
  • Voltage stability.
  • Static stability.
  • Critical oscillations of power and frequency.
• Alarms or early warnings in the case of exceeding or approaching of preset limits.
• Calculation of static stability of system defined as ability to achieve a new, stabile state in the slowly changing conditions.
• Monitoring of frequency and power oscillations.
• Monitoring of voltage stability.

Example P-V diagram with preset limit:

Application benefits:

• On-line evaluation of critical state of power grid.
• Early warning, generation of event in exceeding of preset limits.
• On-line information about parameters and reserve in utilization of important lines.
• Monitoring of voltage stability, creation of live P-V diagram with preset limits and generation of event in exceeding of preset limits.
• Monitoring of reserve of static stability, creation of live ϕ-P diagram with preset limits and generation of event in exceeding of preset limits.

Example ϕ-P diagram of static stability:

Spectral analysis of frequency oscillations:

Terminal – Phasor Measurement Unit (PMU) specification:

• Stand alone unit with in-place compute functions, storage option and remote parameterization.
• Fast parallel measurements — typically 10 kHz.
• Various measurement inputs for range of instrument transformers.
• 8 inputs per terminal.
• GPS time synchronization - phase precision < 0.1°, voltage and currents precisions < 1%.
• Wide range of communication options on physical layer (Ethernet, RS-232, GSM/GPRS) and standard protocols (e.g. IEC-68570-5-101/103/104, IEEE-C37.118) implemented.
• Conforms to EMC standards for industrial environment.

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