GY-SVG-PLUS High-Spec Static Var Generator

1. What is the GY-SVG-PLUS?

GY-SVG-PLUS is the high-spec model of GEYA’s GY-SVG Static Var Generator family. It connects a voltage source converter (VSC) to the grid through an LCL filter and, by adjusting the amplitude and phase of the converter’s AC-side output voltage, dynamically and accurately compensates reactive power, three-phase unbalance and neutral zero-sequence current. It is built on the same DSP + CPLD three-level digital control core as the rest of the GY-SVG family but adds two external CT sampling channels, stronger neutral current filtering and improved EMC for demanding industrial sites.

2. What functions does the GY-SVG-PLUS provide?

• Reactive power compensation — ≥ 99%, inductive & capacitive, stepless and bidirectional.
• Power-factor correction — target PF ≥ 0.99.
• Three-phase unbalance compensation — residual unbalance ≤ 5%.
• Neutral-line zero-sequence current filtering — up to 3× phase line current.
• Voltage stabilisation — fast dynamic regulation of bus voltage.
• Dynamic / impact load compensation — full response < 10 ms.
• Comprehensive protection — overload, over-current, over- / under-voltage, over-temperature, short-circuit and frequency anomaly.

3. What are the key parameters that affect model selection?

• Grid configuration: 3P3W or 3P4W — match to site distribution system.
• Required kvar capacity: determined by total load reactive demand & target power factor; multiple modules can be paralleled.
• Compensation requirements: reactive only, or reactive + three-phase unbalance.
• Sampling strategy: two CT channels for LV-side / HV-side sampling or component compensation.
• Installation environment: ambient temperature, altitude (derate > 2000 m), required IP rating (IP20 standard / IP54 optional).
• Form factor: rack-mount for switchgear cabinets, wall-mount for distributed installations.

4. What options are currently available?

• Form factor: Wall-mounted module or Rack-mounted module.
• Wiring: 3P3W or 3P4W.
• Function: Reactive compensation only, or reactive + 3-phase unbalance compensation.
• Protection rating: IP20 standard; IP54 customisable.
• Communication: 2× RS485 standard, Wi-Fi supported.
• Parallel expansion: Multiple modules can be paralleled on the same feeder for larger capacity.

5. Which standards does it comply with and which markets is it designed for?

The GY-SVG-PLUS is designed in accordance with international power-quality and EMC standards. Its RE and CE EMC items meet Class A test standards, and altitude derating follows GB/T 3859.2. It also supports compliance with IEC 61000 power-quality requirements and typical utility power-factor / voltage-quality codes. The product is targeted at industrial, commercial and infrastructure markets globally — including manufacturing plants, renewable energy plants, oil & gas, mining, EV charging, healthcare, data centers, telecom and rail transit across Asia-Pacific, EMEA and the Americas.

6. Installation notes & precautions

• Parallel connection: The SVG is wired in parallel with the load — never in series.
• Voltage matching: Confirm grid voltage and 3P3W / 3P4W configuration before energising.
• CT installation: Verify CT polarity and ratio on both sampling channels before start-up.
• Ventilation: Maintain clearance for the forced-air intakes; ambient -10 °C ~ +50 °C (derate above 40 °C).
• Altitude: Derate per GB/T 3859.2 above 2000 m.
• Cable entry: Top entry for wall-mount, rear entry for rack-mount.
• Grounding: Reliable PE grounding is mandatory for both EMC performance and personnel safety.
• Commissioning: Configure compensation mode, target power factor and protection thresholds via the HMI or Wi-Fi tool before energising the load.
• Maintenance: Periodically clean the air filter; modules are plug-in replaceable.