Static Var Generator (SVG)

Fast, accurate and intelligent reactive power compensation scheme

- No over compensation, no under compensation, no resonance

- Reactive power compensation effect

- PF0.99 level reactive power compensation

- Three-phase unbalance compensation

- Capacitive inductive load-1~1

- Real-time compensation

- Dynamic response time less than 50us

- Modular design

Excellent compensation performance
Modular design
Multiple compensation modes
Use high-end components
Safe and reliable

Static Var Generator(SVG) Static Var Generators (SVGs) are devices used in electrical power systems to control voltage, power factor and stabilize the system. They are a type of Static Synchronous Compensator (STATCOM) that use a voltage source converter to inject reactive power into the grid. SVGs are able to provide fast-acting reactive power compensation, which improve power quality and help to prevent voltage instability. SVGs are commonly used in industrial plants, wind farms and other applications where reactive power compensation is required. It is a reliable and efficient solution for maintaining the stability and quality of electrical power systems.

Working Principle

Static Var Generator (SVG)

The principle of the SVG is very similar to that of Active harmonic Filter, 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.YIY-SVG is also capable of correcting load imbalance.

Product Advantage

	Capacitor Banks or Reactor Banks	Static Var Generators
Response time	• Contactor-based solutions take at least 30s to 40s to mitigate the problem and thyristor-based solutions 20ms to 30ms	• Real-time mitigation of power quality problems as the overall response time is less than 100µs
Output	• Depends on step sizes, cannot match load demand in real time • Depends on grid voltage as capacitor units & reactors are used	• Instantaneous, continuous, stepless and seamless • Grid voltage fluctuation has no influence on the output
Power factor correction	• Capacitor banks needed for inductive loads and reactor banks for capacitive loads. Problems in systems with mixed loads • Not possible to guarantee unity power factor as they have steps, system will be having continuous over and undercompensation	• Corrects simultaneously from -1 to +1 power factor of lagging (inductive) and leading (capacitive) loads • Guaranteed unity power factor at all times without any over or undercompensation (stepless output)
Design & sizing	• Reactive power studies needed to size the proper solution • Usually oversized to better adjust to changing load demands • Need to be designed taking into account system harmonics • Custom-built for specific load and network conditions	• Not required extensive studies as it is adjustable • Mitigation capacity can be exactly what load demands • Unaffected by harmonic distortion in the system • Can adapt to load and network conditions & changes
Resonance	• Parallel or series resonance can amplify currents in the system	• No risk of harmonic resonance with the network
Overloading	• Possible due to slow response and/or variation of loads	• Not possible as current limited to max. RMS current
Footprint & installation	• Medium to large footprint, especially if several harmonic orders • Not simple installation, especially if loads upgraded frequently	• Small footprint and simple installation as modules are compact in size. Existing switchgear can be used
Expansion	• Limited and depends on load conditions and network topology	• Simple (and not dependant) by adding modules
Maintenance & lifetime	• Using components that need extensive maintenance like fuses, circuit breakers, contactors, reactors and capacitor units • Switching, transients and resonance reduce lifetime	• Simple maintenance and service life up to 15 years as there is no electro-mechanical switching and no risk of transients or resonance