EnerVar

Modular Active VAR Power Factor Compensation

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:

  1. Regulate Reactive Power: Cos ∅ = 1.00
  2. Compensate Current Harmonic
  3. Re-adjust unbalance current between phases
  4. 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

ModelEnerVAR AVG
Nominal Operating Voltage208V230V400V480V
Voltage Tolerance+15%, -20%+10%, -20%
Available Capacity Per Module*25kVAR30kVAR55kVAR65kVAR
Phase/Wires3 phase 3 wires or 4 wires3 phase 3 wires only
Nominal Frequency50/60Hz ± 5% (Auto Sensing)
Weight, kG~35kG / modules
Parallel OperationUnlimited, with same or different ratings.
Reactive Power (Power Factor Correction) capabilityCapable of both Inductive (lagging) & Capacitive (leading) reactive power compensation, programmable to achieve the desire targeted PF
Harmonics Attenuation CapabilityUp to 30% of rated capacity, Programmable From 3rd to 13th harmonic orders, typical attenuation ratio 10:1
Load BalancingBoth phase to phases and phase to neutral
CT RatioProgrammable Primary Current: 200A~16000A Programmable Secondary Current: 1A/5A
CT LocationSelectable Source Side: Close Loop Control Load Side: Open Loop Control
Dynamic Response Time<10ms
Inrush CurrentLess than rated current
Maximum Heat Losses£3% at full capacity
Communication InterfacesUSB, Ethernet (TCP/IP), RS-485 (Modbus RTU Protocol)
Digital I/O3 x Digital Outputs + 1 x Digital Input + 1 x EPO
 

EMC Class Compliance

EN61000-6-4, EN55011, CISPR11, IEC61000-3-11, IEC61000-3-12, EN61000-6-2, EN61000-4-2, EN61000-4-3, EN61000-4-4, EN61000-4-5, EN61000-4-6, EN61000- 4-8, EN61000-4-34
Harmonics Reference StandardsEN 61000-3-4 , IEEE 519-1992
Safety StandardComplies to EN 62477-1
Design StandardAccording to EN 60146
Operating Ambient Temperature-10°C to 40°C (Up to 50°C with suitable derating)
Operating HumidityMaximum 95% RH; non-condensing

*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

Ask for Assistance

Selecting the right power supply for your application is not a small task. Let our technical sales engineers guide you through the process of choosing the right solution for your needs.

Below some parameters usually required to size and select the right power supply:

  • Power & control requirements
  • Output & Input Voltage / Multioutput Voltage / Variable Voltage
  • Redundancy level
  • Mounting
  • Inrush Current
  • Environmental specifications (Temperature, altitude, vibration, shock)
  • Specific Industries Standards (Railway, Military, Medical)
  • Terminals

Contact Our Team

Contact our team of experienced engineers to discuss your unique power conversion and backup needs. We offer a wide range of highly reliable components that can be integrated and customized to create a solution that meets or exceeds your requirements.

For power automation systems please contact us at power.systems.automation@heliosps.com.au

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