Solusyon sa Voltage Transformer: Paghahabi sa Transient Response para sa mga Renewable Energy Stations

Ⅰ. Background and Pain Points​
Ang mga renewable energy stations (photovoltaic/wind power) naghaharap sa komplikadong transient processes dahil sa malawakang paggamit ng mga power electronic devices, kabilang dito: inverter shutdown surges, broadband resonance, at DC component interference. Ang mga conventional PTs/CTs ay limitado sa bandwidth, response speed, at anti-saturation capability, kaya hindi sila makakapagtamo ng accurate na capture ng transient voltage waveforms. Ito nagresulta sa protection misoperations, difficulty sa fault location, at pagbaba ng lifespan ng mga equipment.

​Ⅱ. Transient Response Monitoring Solution for Renewable Energy Stations​
Ang solusyon na ito ay espesyal na disenyo para sa mga transient processes sa renewable energy stations, ang core capability nito ay wide-bandwidth, high-precision voltage measurement mula DC hanggang 5kHz.

• ​Technical Focus: Wide-Band Measurement Capability (DC-5kHz)​​
  Nagbibigay ng breakthrough sa bandwidth limitations ng mga conventional transformers, nakakalampas sa mga key transient signals tulad ng sub-synchronous oscillation (SSO), switching-frequency harmonics, high-frequency resonance, at slow DC offsets.
• ​Key Technologies​
  Resistive-Capacitive Divider + Rogowski Coil Integration:​​
   • Resistive-Capacitive Divider: Nagbibigay ng precise na wide-band voltage measurement (10Hz-5kHz) na may fast transient response at strong anti-interference.
   • Rogowski Coil: Nagsusukat ng high-frequency current rate-of-change (di/dt). Ang integrated complementary signals ay gumagawa ng buong wide-band voltage signal, na nagpapahaba ng effective bandwidth hanggang 5kHz at lumalampas sa single-sensor limitations.
   ​0.5Hz Low-Frequency Phase Compensation Circuit:​​
  Para sa ultra-low-frequency sub-synchronous oscillations (e.g., <1Hz) ng sistema, ginagamit ang dedicated compensation algorithms at low-noise analog circuits upang panatilihin ang phase error <0.1° sa 0.5Hz, na nagse-secure ng phase authenticity at amplitude accuracy ng mga sub-synchronous components.
  Anti-DC Component Saturation Design (120% DC Offset):​​
  Ginagamit ang high-Bsat nanocrystalline magnetic cores kasama ang active bias compensation technology. Nakakataas ng sustained DC offsets hanggang 120% ng rated voltage nang walang saturation, na nagpapahintulot sa prevention ng measurement distortion dahil sa DC components mula sa inverter faults o grid asymmetry.
• ​Dynamic Performance Specifications​
  Step Response Time: <20μs – Nagse-secure ng rapid capture ng instantaneous overvoltages dahil sa switching actions (e.g., IGBT turn-off).
  Harmonic Measurement Accuracy: Up to 51st order (2500Hz@50Hz) – THD accuracy ±0.5% – Nagpapatugon sa mga requirement para sa precise power quality assessment at resonance analysis.
  Transient Overvoltage Recording Resolution: 10μs/point (equivalent to 100ksps sampling) – Nagbibigay ng high-resolution waveform recording para sa millisecond-level transient events (e.g., lightning strikes, ground faults).
• ​Application Scenarios​
  PV Inverter Turn-off Overvoltage Monitoring: Precisely measures voltage spikes during IGBT turn-off (dv/dt >10kV/μs), locates the source of reflected wave overvoltages, and optimizes RC snubber parameters and cable layout.
  Wind Farm Collection Line Resonance Analysis: Captures broadband resonance (e.g., 2-5kHz) caused by interactions between long cable distributed capacitance and SVGs/generator sets. Provides characteristic harmonic spectra and attenuation characteristics to guide active damping parameter tuning.
  Sub-Synchronous Oscillation (SSO/SSR) Monitoring: Accurately records phase and amplitude changes of sub-synchronous oscillation voltages within the 0.5-10Hz range, providing core data for oscillation source localization and suppression strategies.
  Protection Misoperation Analysis Due to DC Components: Provides accurate fundamental component measurements even under significant DC offset conditions, preventing protection device misjudgments caused by transformer saturation.