ZDDQ Static Var Generator
Dec 10,2019

What is Static Var Generator?

Static Var Generator (SVG) also known as instantaneous stepless reactive power compensators or active power factor  compensators (APFC),are the ultimate solution to power quality problems  caused by low power factor and reactive power demand for a wide range of segments and applications.

SVG is a high performance, compact, flexible, modular and cost-effective type of active power filters (APF) that provide an instantaneous, smoothly and fastest speed to power quality problems in L.V or H.V electric power systems.

svg principle
svg principle

Satic Var Generator enable longer equipment lifetime, higher process reliability, improved power system capacity and stability, and reduced energy losses, complying with most demanding power quality standards.

What is the main function of SVG?

Low power factor increases the active energy losses of installations and affects their stability. It is typically caused by inductive or capacitive loads that demand extra reactive power to perform properly. Other contributors to low power factor are harmonic currents produced by nonlinear loads and the change of load in the electric power system.

Static Var Generator delivers real-time inductive or capacitive reactive power compensation. Rapid response time provides stable and accurate power factor correction without the drawbacks of conventional solutions like capacitor banks and reactor banks.

static var generator principle

HOW Does SVG Work?

Static Var Generator is a power electronics-based device connected in parallel with the lloads that require harmonics mitigation. SVG works as a controlled current source providing any kind of current waveform in real time.

When the load generates inductive or capacitive current, it makes load current lagging or leading the voltage. SVG detects the pase angle difference and injects in real time leading or lagging current into the electric power systems, making the phase angle of the current almost the same as that of the voltage, bringing fundamental power factor to unity.

What are benefits of SVG?

Reactive power compensation: Cos Φ = 1.00.

Continuous correction – step-less control. SVG controls from 0 – rated kVAr as one continuous range.

Both capacitive and Inductive compensation: -1 to +1.

Response time with full correction in less than 5ms. Suitable for highly dynamic loads where the power factor fluctuates rapidly or in big steps e.g. saw mills, cranes, welders.

No over compensation or under compensation as experienced with capacitor switching systems.

Current imbalance correction can correct for load imbalance across all three phases.

Unaffected by harmonic distortion and free from harmonic resonance

Unaffected by network voltage drop. Even under reduced network voltage levels full reactive current can be provided to meet working conditions.

There is no nasty transient voltage spikes caused by the switching of capacitors.

Presents to the electricity grid as a very high impedance device. Network companies need not worry about the attenuation of ripple injection signals.

What are SVG Typical Applicaitons?

Installations with fast changing reactive power demand like electric arc furnaces and ball mills.

Highly dynamic loads where the power factor fluctuates rapidly or in big steps like cranes, sawmill machinery, welding machines, etc.

Correction of leading power factor like in data centers allowing back-up generators operation.

UPC systems.

Solar inverters and wind turbine generators.

Railway electrification systems: Trains & trams

Loads with low power factor: Motors, cables, lightly loaded transformers, lighting, etc.

SVG applicaiton

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