The Revolutionary Reactive Power Generator Utilising 3-Level Igbt For Power Factor Correction
The EnerVAR is a modular Active VAR generator (AVG), which utilizes a high-speed three-level inverter (IGBT) to control the reactive power flow of the system. The AVG detects the load current through the external CT and regulates the voltage by continuously absorbing or injecting the reactive power in the power system.
The voltage and current waveform produced is almost sinusoidal, achieving a near unity power factor. The switching frequency of the IGBTs provides extremely fast control resulting in very low electrical losses, less stress on the components, increasing the equipment lifetime.
The key functions of an AVG are:
Regulate Reactive Power: Cos ∅ = 1.00
Compensate Current Harmonic
Re-adjust unbalance current between phases
Treat Flickers
Powerful Performance
Close / Open Loop Selectable
Ultra-fast response time from detection to complete correction in <10msec.
Load balancing between phases and unload neutral
Programmable DSP control Reactive Power injection to desire value. No risk of under or over
Expandable Capabilities
True modular hot-swappable design, non-disruptive replacement without powering off the
Unlimited parallel operation with same or different AVG ratings systems to meet various power demand without over sizing
User-Friendly Human-Machine Interface
HMI utilising 7inch Coloured LCD Touch Screen for advanced control and monitoring, complete with Modbus RTU and Ethernet TCP/IP
Typical Application
Hospitals, Data centers, Green Buildings, TV
Chemical industry, Oil and gas, Steel
Water treatment plants, Automotive
Technical Specifications
Model
EnerVAR AVG
Nominal Operating Voltage
208V
230V
400V
480V
Voltage Tolerance
+15%, -20%
+10%, -20%
Available Capacity Per Module*
25kVAR
30kVAR
55kVAR
65kVAR
Phase/Wires
3 phase 3 wires or 4 wires
3 phase 3 wires only
Nominal Frequency
50/60Hz ± 5% (Auto Sensing)
Weight, kG
~35kG / modules
Parallel Operation
Unlimited, with same or different ratings.
Reactive Power (Power Factor Correction) capability
Capable of both Inductive (lagging) & Capacitive (leading) reactive power compensation, programmable to achieve the desire targeted PF
Harmonics Attenuation Capability
Up to 30% of rated capacity, Programmable From 3rd to 13th harmonic orders, typical attenuation ratio 10:1
*the current rating may be derated automatically depending on load conditions for ambient temperature higher than 40° C.
Operating Principle
The EnerVAR is a modular Active VAR generator (AVG), which utilizes a high speed three level inverter (IGBT) to control the reactive power flow of the system. The AVG detects the load current through the external CT and regulates the voltage by continuously absorbing or injecting the reactive power in the power system. The voltage and current waveform produced is almost sinusoidal, achieving a near unity power factor.
The switching frequency of the IGBTs provides extremely fast control resulting in very low electrical losses, less stress on the components, increasing the equipment lifetime.
The key functions of an AVG are:
Regulate Reactive Power : Cos f = 00
Compensate Current harmonics
Re-adjust unbalance current between phases
Treats Flickers
CT Installation
External auxiliary coupling current sensing transformers (CT) are the essential components in all power factor correction applications. The EnerVAR AVG is designed to have selective CT sensing configurations installed on Load Side or Source Side.
Modular & Scalable Architecture
The compensation power electronics consisting 3-Level IGBT are housed in compact enclosed modules with speed controlled cooling fans for thermal dissipation. These rated AVG modules are equipped with live hot-plug connectors for ease of configuration and frame integration.
The compensation reactive power can be sized accordingly and gradually extended using additional AVG modules and frames. Standardizing the components ensures short delivery time and cost effectiveness.
The modular structure makes the EnerVAR AVG resilient to errors. Should a module fails, the other Modules continue to function until the error is rectified. Installation and maintenance are much easier with hot plug-in operation and front fan replacement. Reduced downtime with MTTR of less than 120 minutes.
Differently Rated AVG Systems can be wired in parallel
The frame system features a hot-swappable modular design, and modules are configured seamlessly in one frame. The frame system can be parallel and supplied accordingly to various application environment, and differently Rated AVG Systems can be applied in parallel according to requirements.
Each Frame is complete with bus bar, hot-plug connectors, sliding rail kits and auto-power cut contacts for easy adds on or removal of power modules. No messy cabling
Different Frame size available for 4, 6 & 8 power modules to meet small to high power ratings
Unlimited parallel operation to achieve any desire kVAR
Enable Pay-As-You-Go; companies can save on buying large capacity from the beginning, but instead increase the KVAR rating gradually when demand