Products

Static Var Generator

i-PFC(Inverter based Power Factor Correction) is the trademark name of the Static Var Generators (SVG) developed and manufactured at InstaSine. Making use of advanced controllability of 3-Phase 3-Level IGBT based voltage source inverter architecture, i-PFC SVG does precise power factor and unbalance correction without the need of any passive power factor correction capacitors.

i-PFC SVGs are capable to perform:

  • Harmonic currents mitigation in phase currents
  • Reactive Current mitigation in phase currents (i.e. power factor correction)
  • Negative Sequence Currents Mitigation (balancing three-phase load currents)
  • Zero sequence current mitigation (Neutral current mitigation, using 3P4W AHFs)
  • Transformer HT side power factor correction while connected at LT side.

Compensation Philosophy

  • i-PFC AHF identifies the downstream load current composition (such as, active, reactive, harmonics and unbalance components) using intelligent artificial neural network (ANN) based control technique and cancels the unwanted components at the load end through precise control of IGBTs.
  • Based on the selective harmonic compensation, i-PFC AHF computes the magnitude of individual harmonic, fundamental reactive and unbalanced current that are to be compensated.
  • As long as the compensation requirement is within the rating of i-PFC AHF capacity, it compensates all the unwanted current components. In case the requirement is higher than its rated capacity, compensation current is dynamically limited to i-PFC AHF capacity using inbuilt real-time current limiting algorithm.
  • Thanks to our closed-loop adaptive ANN control philosophy, i-PFC AHF dynamically compensates the unwanted components of load current even when the load changes frequently.
Static Var Generator

i-PFC SVG Features
Step-less Correction: Precisely controlled inverter architecture benefit i-PFC SVGs with step-less reactive power compensation, making them free from over/under compensations. This makes them the ideal solution for maintaining power factors above 0.99 at all times.
Bidirectional Correction: i-PFC SVGs and only active/SVG part of hybrid solutions, are capable to compensate both inductive and capacitive reactive loads. .
Capacitor switching and resultant Voltage Surges: Full inverter based i-PFC SVGs are free from frequent mechanical operations such as contactor opening and closing (also, free from capacitor charging/discharging). In APFC and hybrid solutions such frequent capacitor switching creates voltage dips/spikes at PCC. These surges may trigger the malfunctioning of sensitive systems connected to the same LT network
Response time from 0-100% Output: During the load changes, i-PFC SVC can ramp up from 0 to 100% and ramp down from 100% to 0% capacity in less than 20 milli seconds, without causing any transients. Such a feature is most needed at places where frequent start-stop of processes or motors are involved. Hybrid solutions might take tens of seconds in ramping up and ramping down due to time lags in calculation and switching of corresponding capacitor banks. This hinders their performance in achieving power factors very close to unity..
Harmonic amplification Chances: The i-PFC SVGs cause near-zero current harmonic injection while performing the power factor correction, even if the voltage THD level goes to 15%. Detuned APFC and hybrid solutions cause resonance/amplification of current harmonics which are below their resonance frequencies. And, are highly sensitive to input voltage harmonics. In case of input voltage harmonics above 2-3%, the passive part of APFC panels tend to draw corresponding current harmonics in addition to plant current harmonics. Which is unwanted in true kVAH based tariff structure.
Voltage Dependency of kVAR Capacity: KVAR capacity of i-PFC SVG is proportional to grid voltage. Detuned APFC and passive part of hybrid solutions kVAR capacities are proportional to square of the voltage. Means, minor voltage fluctuations result in large reactive power swings .
PF and unbalance correction with 1-Phase & 2-Phase loads: Capability to use the 100% capacity for negative sequence correction, make i-PFC SVGs to be the only contender power factor correction in the presence of large single-phase and two-phase loads.
Maintenance Requirements: Having no frequent mechanical operations in i-PFC SVGs make them relatively maintenance free. In detuned APFC or hybrid solutions, there is always a risk of capacitor and/or contactor explosion due to the constant mechanical switching, which is a safety risk.
Footprint: i-PFC SVG's minimal footprint saves more than 70% space, compared to the conventional APFC and/or hybrid solutions.

i-PFC SVG Benefits

  • Step-less reactive power compensation (no over/under-compensations)
  • Bi-directional reactive power compensation (compensates both inductive and capacitive reactive power of loads)
  • Compatible with LT or HT Side current sensing, with all groups of transformer configurations
  • HT side power factor correction from LT side CT sensing using the InstaSine's smart-sense technology
  • Near unity power factor correction at all load conditions
  • Faster dynamic response time (less than 100 micro seconds)
  • Shortest power factor correction time (less than 20 milliseconds)
  • Low kVAR capacity dependency on grid voltage fluctuations .

i-PFC SVG Specifications
Plant Input Conditions
System Voltage (RMS) 350 - 480 V
System Frequency (Hz) 50 ± 5%
Operating temperature range 0 to 450C (Non-Condensing)
Product Specification
Semiconductor Devices IGBTs (3-Level Topology)
Maximum Reactive Power Output @480V 125kVAR
Step-less Compensation Range -100kVAR to +125kVAR
Rated RMS current Output 150A
i-PFC configuration 3P3W
Power Factor Correction Yes
Load Current Balancing Yes, Negative Sequence
CT Requirement 3CTs with 1A or 5A Secondary
CT Position Load Side / Source Side
Integrated Short-Circuit Protection Yes
Dimensions 800 x 890 x 330
i-PFC Control and Paralleling
Controller ARM based MCU
Control Method Adaptive Artificial Neural Networks (ANN)
Dynamic Response Time 100 microseconds
Correction Time 10 milli seconds
Parallel Operation Upto 50 modules per CT set
System Integration
CT connections between modules Daisy Chain Type
Display 7" TFT Touch-Screen Display
Software for PC Interface InstaView
Cloud Connectivity Yes
Color Standard
Noise Level less than 65dB

*Note: Custom designs are available on request.