i -Sine is trademark name for the Active Harmonic Filter (AHF) developed and manufactured at InstaSine. The i -Sine AHFs are equipped with newest generation IGBTs that are intelligently controlled using Artificial Neural Network (ANN) based architecture. Our AHF is most advanced and effective power quality improvement solution to mitigate harmonic, unbalance, and reactive currents.
| Harmonic Migration: | i -Sine AHF ensures that the harmonics are within the limits specified by the IEEE 519-1992 with full dynamic compensation. | |||
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| Power Factor Control: | i -Sine AHF ensures unity power factor operation of the plant. Fully dynamic compensation adaptive to the load changes. | |||
| Current Balancing: | i -Sine AHF assures the plant current drawn from the EB to be balanced and sinusoidal. | |||
| Neutral Current Compensation: | A 3P4W i -Sine AHF fully supports the load neutral current locally and assures zero neutral current on the source/EB side. | |||
| Long-lasting: | To prevent i -Sine AHFs from most common DC link capacitor failure problem, the DC link is realized using film capacitors with an operational life greater than or equal to 100,000 hours. | |||
| Designed for harsh weather conditions: | Designed to operate at 50°C ambient temperature without any deration. PCBs are applied with conformal coating for improved reliability. | |||
| No over sizing: | i -Sine AHFs are designed to compensate the harmonic current with peak magnitude of 2.2 times the RMS current (continuous rating). Therefore, our units do not require over sizing for the high peak current loads. | |||
| No prerequisite: | i -Sine AHF in general, does not require the installation of input chokes with VFDs, as long as the load current THD is below 40%. | |||
| Wide Range of Harmonics Selection: | i -Sine AHFs cancel all the odd harmonics up to 71st order. Further, these harmonics are individually selectable without any limit on the number of harmonics selections at a time. | |||
| Best-In-Class Energy Efficiency: | i -Sine AHF consists of an intelligent On-The-Fly real-time internal switching loss minimization technique to enhance the converter energy efficiency. Additionally, the state-of-the-art LCL based third order filters reduce the filtering losses as well. | |||
| Optimum Design: | Light in weight, compact in size, quieter in operation while delivering best-in-class performance. | |||
| Integrated Best-in-Class HMI: | i -Sine AHFs have integrated 7-inch TFT touch-screen display to visualize/set the AHF and plant parameters. Moreover, the user can observe the real-time three-phase voltages and currents (load /AHF/source side) waveforms just like an oscilloscope. | |||
| In-house R&D and manufacturing with better service: | The research, development, and the manufacturing activities are fully carried out by InstaSine. This certainly eases our team in providing the guaranteed service even after the end of the warranty period. | |||
| Plant Input Conditions | ||||
| System Voltage (RMS) | 350 - 450 V | |||
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| Fundamental Frequency (Hz) | 50 ± 5% | |||
| System Configuration | 3P3W and 3P4W (single-phase option available) | |||
| Product Specification | ||||
| Power Semiconductor Devices | IGBTs | |||
| Output Current Ratings (RMS) | 25A/ 50A/ 100A/ 150A/ 200/ 300A | |||
| Continuous Peak Compensating Current Rating | 2.2 times RMS Value “No need of oversizing with VFD loads” | |||
| Harmonic Compensation Range | All odd harmonics up to 71st order “Widest range and fastest harmonic filtering available in India” | |||
| Selective Harmonic Compensation | From 0 to 100% for all 71 Harmonics “No limit on the number of harmonics selection at a time” | |||
| Reactive Power Compensation | Yes | |||
| Harmonic Attenuation Factor | More than 97% at rated load | |||
| Load Current Balancing | Yes | |||
| Cooling | Forced Air Cooling | |||
| Cable Entry | Bottom | |||
| Mounting | Wall mounting/ Floor mounting | |||
| i -Sine AHF Control System | ||||
| Controller type | Digital control | |||
| Control Method | Based on Adaptive Artificial Neural Networks (ANN) “Ultra-fast computation” | |||
| Dynamic Response Time | 100 microseconds | |||
| User Interface | ||||
| Monitoring (Waveform and Parameters) | Through InstaVIEW software on USB port | |||
| User Parameter Setting | Using InstaVIEW software | |||
| Additional Details | ||||
| Operating Temperature Range | 0 to 50°C “No derating required in the entire operating range” | |||
| Active Power Loss | Less than 3% | |||
| Parallel Operation | Yes | |||
| Short-circuit Protection | Yes | |||
| Color | Standard | |||
| Noise Level | 65dB | |||
| i -Sine AHF Sizing | ||||
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| Plant Harmonic and Reactive Current Calculations | ||||
| The i -Sine AHF should be sized properly to compensate both the harmonics and fundamental reactive currents simultaneously. Following procedure can be used to compute the requiredi -Sine AHF rating. The knowledge of three basic parameters required to size the i -Sine AHF are: | ||||
| Parameter | Symbol | |||
| Total RMS current drawn by the plant at full load | I rated | |||
| Total current harmonic distortion at full load | THDi* | |||
| Fundamental power factor (either leading or lagging) | PF | |||
| * Absolute value (i.e., percentage/100). | ||||
| Once the above parameters are known, the plant total harmonic current (IH) in amperes can be calculated as: $$IH = Irated { \sqrt{{THDi^2} \over 1 + THDi^2}}$$ | ||||
| While, the plant total fundamental reactive current (IQ) in amperes can be determined as: $$IQ = Irated { \sqrt{{1- THDi^2} } \sqrt{ 1 - PF^2}}$$ | ||||
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i -Sine
AHF Rating Selection
The RMS current rating (IF) of i -Sine AHF can be selected as per the compensation requirement. |
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| Purpose of AHF | i-Flex AHF Rating in Amperes (RMS) | |||
| Harmonics Cancellation Only Compliant to EB harmonic requirements (or IEEE standards, such as, IEEE 519-2014) |
$$IF = IH $$ | |||
| Unity Power Factor Operation Only For maximizing power factor incentives only |
$$IF = IQ $$ | |||
| Simultaneous Harmonics Cancellation and Unity power Factor Operation Compliant to EB harmonic requirements and power factor incentives | $$IF = { \sqrt{{I^2H + I^2Q} } }$$ | |||
Case Study: Current Harmonic Compensation, Load Balancing and Neutral Current Compensation
A plant load current profile at one of our client locations is shown below. Following problems were noticed:
| Plant Performance without AHF Installed | ||||
| Parameter | Phase - R | Phase - Y | Phase - B | Neutral |
| Current (RMS) | 218 A | 170 A | 172 A | 61 A |
| THD (%) | 12.4 % | 16.8 % | 17.7% | - |
With 3P4W i -Sine AHF installed at the above client location, an excellent improvement in the plant input currents can be noticed with the following observations:
| Plant Performance with AHF Installed | ||||
| Parameter | Phase - R | Phase - Y | Phase - B | Neutral |
| Current (RMS) | 163 A | 163 A | 161 A | 5 A |
| THD (%) | 2.0 % | 1.9 % | 1.7% | - |
Without AHF installed, poor true power factors and poor displacement power factors were noticed at the plant input side. However, when i -Sine AHF is installed, both true and displacement power factors are being maintained at 1.00 (ideal operating condition).
