Static Var Generator (SVG)

SVG Principle

The principle of the SVG is very similar to that of Active Power Filter, as demonstrated in the picture below. When the load is generating inductive or capacitive current, it makes load current lagging or leading the voltage. SVG detects the phase angle difference and generates leading or lagging current into the grid, making the phase angle of current almost the same as that of voltage on the transformer side, which means fundamental power factor is unit.

Delta’s PQC series SVG is also capable of correcting load imbalance.

SVG Principle

SVG - Waveform and Vector


SVG Structure

Delta PQC Series SVG is also modular in design, and the Delta SVG system consists of one or several SVG modules and an optional Liquid Crystal Monitor & Control Panel (LCM). Each SVG module is an independent reactive power compensation system, and users can change the SVG rating by adding or removing SVG modules.

SVG modules and LCM panel can be embedded in Delta’s standard SVG cabinet or in a customized cabinet. There are usually breakers, cable terminals and Surge Protection Device (SPD) in the SVG cabinet.

Product Introduction

Features & Benefits

 

  • Multifunctional: Reactive power and imbalance compensation
  • Excellent reactive compensation: High speed, Precise (-0.99 ≤ Cosφ ≤ 0.99), Step-less, Bi-directional (capacitive and inductance) compensation
  • Excellent imbalance correction: Both negative and zero sequence, mitigates neutral current
  • Wide input voltage & frequency range, adapts to tough electrical environment
  • Low thermal loss (≤ 3% of rated SVG capacity), efficiency ≥ 97%
  • High stability: Infinite impedance to grid, avoids harmonic resonance problem
  • Flexible application: Modular design, embedded in standard or customized cabinet
  • Easy installation and maintenance: Easy installation for APF module replacement and expansion
  • Wide capacity range: 50~350 kvar for a single cabinet, up to 10 cabinets in parallel
  • Environmental adaptability: -10~50°C temperature, compatible with diesel generators
  • Complete protection: Grid over/under voltage, SVG over current, over temperature, and others. All faults recorded inevent log, convenient for failure analysis

 
Specifications
  1. Electrical Specification
  2. Rated Voltage : AC 400V
    Input Voltage Range : AC 308V~480V
    Electric Connection : 3P3W / 3P4W
    Rated Frequency : 50(60)Hz ±10%
    Rated Capacity per Module : 50kvar
    Rated Current per Cabinet : 50~350kvar (module combination)
    Redundancy : Each module is an independent reactive compensation system
    Reactive Power Compensation Capability : Both inductive and capacitive reactive power
    Reactive Power Compensation Performance : Cosφ≥0.99 after compensation (if the SVG capacity is sufficient)
    Imbalance Correction Capability : Mitigate negative and zero sequence
    Full Response time : <20ms
    Instant Response time : <100us
    Thermal Loss : ≤3% of SVG rated capacity
    Output Current Limitation : Automatic (100% rated capacity)
    Parallel Expansion(System) : Up to 10 Racks (7 modules per cabinet)
    MTBF : >100,000 hours
  3.  
  4. Control Technology
  5. Switching Frequency : 30kHz
    Controller : DSP control
    Communication : Modbus Protocol, RS232/485
    Monitoring : PQC Monitor Software (Optional)
  6.  
  7. Physical Specification
  8. IP Grade of Cabinet : IP20, IP30 or customization
    Cooling method : Intelligent forced air cooling
    Noise Level : < 60dB(A) @1m (Module)
    Dust Filter : Optional
    Dimension : Refer to SVG Model table
    Weight : Refer to SVG Model table
  9.  
  10. Environmental Requirement
  11. Ambient Temperature : -10~50°C
    Relative Humidity : 0~95%
    Altitude : ≤1000m rated capacity, 1000~2000m(derating 1% per 100m)

 
Download

PQC Series Power Quality Solution (Brochure)
Active Power Filter (APF), Static VAR Generator (SVG)