Grid-Code Power Quality for Wind, Solar & Storage
At the point of interconnection, intermittent generation and inverter harmonics stress voltage, power factor and grid-code limits. GEYA SVG / ASVG deliver dynamic reactive support from equipment rated 220V to 800V. At 10kV and 35kV metering points, high-side sampling coordinates low-side compensation to help the plant meet power-factor, voltage and flicker requirements.
Power Quality at the Interconnection Point
Renewable plants stress the grid in three specific ways. We measure each before recommending hardware.
Reactive Power & Voltage Swings
Fast changes in PV / wind output swing the voltage at the POI and drag power factor below the level the grid operator requires.
Fix · SVGInverter-Sourced Harmonics
Grid-tie inverters inject current harmonics that distort the waveform, heat transformers and can fail the harmonic limits in the grid code.
Fix · AHF / ASVGGrid-Code & LVRT Compliance
Operators demand dynamic reactive support, voltage hold and low-voltage ride-through. Heavy rooftop PV can also push feeders into over-voltage.
Fix · Dynamic SVG / AVC
Dynamic Reactive Support, Compliant by Design
A GY-SVG - or an all-in-one GY-ASVG - provides fast, continuous reactive power at the interconnection point, supporting voltage during generation swings and correcting power factor. Where the metering point sits on the 10kV / 35kV side, GEYA uses high-side sampling with low-side compensation, so a low-voltage unit corrects the high-side power factor to pass grid assessment.
- GY-SVG: reactive rate ≥99%, response <10 ms, no resonance
- High-side sampling / low-side compensation for 10kV / 35kV metering
- GY-ASVG adds 2nd-50th harmonic + imbalance in one cabinet
- GY-AVC regulates PV-feeder over-voltage back to 230 V
New-Energy Projects
When the metering point sits on the 10 kV / 35 kV side, GEYA passes grid assessment with low-voltage equipment - high-side sampling, low-side compensation. Three field-proven wiring schemes trade off accuracy, response speed and cost.
Multifunction Meter + Secondary-Sampling CT
A clamp-on CT taps the secondary sampling line of the 10 kV metering meter, and a multifunction meter reads its voltage and current to derive active power, reactive power and power factor. The SVG - installed on the 400 V / 800 V low-voltage side - reads these values over RS-485 and outputs exactly the reactive power needed to lift the high-side power factor to the assessment target.
- Best for pure PV export and EV-charging stations, where load active power is small
- Simple wiring - no need to touch the 10 kV metering secondary circuit, no outage
- Highest compensation accuracy of the three schemes
- Commissioning is more involved; keep meter and SVG within ~300 m (wireless link available); response up to ~3 s
Main configuration: SVG · 7-inch touchscreen · multifunction meter · secondary-sampling CT · RS-485 cable
Direct 10 kV High-Side CT Sampling
A dedicated CT installed on the 10 kV side feeds real-time current data straight into the SVG, which computes the high-side reactive power and power factor directly and compensates from the low-voltage side - within 10 milliseconds, the fastest of the three schemes.
- Best for factory distributed PV - self-consumption plus surplus export, with larger load active power
- Simple wiring and the most straightforward commissioning
- ≤10 ms dynamic response rides through fast PV output swings
- Needs a planned 10 kV outage to wire the CT secondary into the SVG; accuracy below Scheme 1; keep CT and SVG within ~300 m
Main configuration: SVG · 7-inch touchscreen · high-side CT · secondary sampling line
Meter + CT + CSVG Hybrid Control
The same non-invasive metering as Scheme 1, plus a CSVG controller that reads the data over RS-485 and coordinates a hybrid output: the SVG handles the fast, fine-grained portion while switched capacitor banks on the 400 V side supply the bulk reactive power - high accuracy at the lowest cost per kvar.
- Best for pure PV export and charging stations that need larger reactive capacity
- Retrofit-friendly: reuse existing 400 V capacitor banks by adding a CSVG controller - upgrade in place, cut total cost
- Controls up to 24 capacitor channels alongside the SVG
- Commissioning is more involved; keep devices within ~300 m; response up to ~3 s
Main configuration: SVG · CSVG controller · multifunction meter · secondary-sampling CT · RS-485 cable
New Energy - Common Questions
Engineer-to-engineer answers to help you spec the right device for grid integration.
Can a low-voltage SVG correct power factor on the 10kV / 35kV side?
Yes. GEYA SVG and ASVG support high-side sampling with low-side compensation: a CT or multifunction meter samples the 10kV / 35kV side while the unit installs on the 400V / 800V side and indirectly corrects high-side power factor to meet grid assessment. Three schemes trade off accuracy, response (10 ms to about 3 s) and cost.
How does GEYA support grid-code reactive-power requirements?
A GY-SVG provides dynamic reactive support with a response under 10 ms, helping stabilize voltage during fast generation swings and correct power factor. At 10kV or 35kV metering points, high-side sampling coordinates the 400V or 800V compensation equipment. Project-level LVRT compliance must still be verified against the plant inverter, protection settings and the applicable grid code.
Rooftop PV is pushing my feeder into over-voltage - what fixes it?
Use a TPQR / GY-AVC. In a distribution area in East China, large-scale PV integration caused over-voltage and three-phase imbalance that tripped inverters; a TPQR regulated the voltage back to 230 V and rebalanced the phases to meet compliance standards.
Explore Other Industries
Different load, different fix. See how GEYA solves power quality across sectors.
Connecting a Renewable Plant?
Send us your single-line diagram and grid-code requirements - our engineers will model your interconnection point and recommend the right SVG, ASVG or AVC solution.
