There are a number of electrical devices that have noninear operating characteristics i.e even when applied voltage is sinusoidal in nature, the current drawn by the device is non-sinusoidal in nature. The AHF system is constructed of one or several filter modules with system controller. Active harmonic filters are parallel filters (which means the current doesn’t go through the filter) that are used to reduce, or mitigate, harmonics to tolerable levels as defined by IEEE-519. The harmonic content varies from one installation to the other. The corrective current is equal to but 180 degrees out of phase with the existing harmonic currents to cancel their effect. AHF - Active Harmonic Filter. The company is incorporated in 1992 with a well laid out building with latest machineries and modernizing periodically to meet the market requirements. A technical portal to power backup & power conditioning. Active Harmonic Filters provide far superior flexibility and performance over passive filters. Output The customer is one of the leading suppliers of premium quality yarn supplier in South India. Passive and active filters are combined in a single system to constitute a hybrid filter (see Fig. The use of the filter enables: • Reduction of harmonic distortions in line current; Active Harmonic Filter is based on the principle with a real-time measuring device and will actively generate a harmonic current spectrum in opposite phase to the measured distorting harmonic current for cancellation. For example, MTE Corporation’s Matrix AP harmonic filter provides better performance feeding a 6-pulse drive than using 12-pulse or 18-pulse drives alone. TER. Supports flexible configuration and capability to expand vertically as well as horizontally. An Active Harmonic Filter (AHF) provides an effective means to mitigate harmonics, reduce process-related voltage fluctuations and improve equipment operating life and system capacity. Customer were facing challenges due to harmonics like, We performed a load study to understand the harmonic content and the summary of our findings are as below. So the harmonic currents are cancelled. Compatible with diesel generators & harsh ambient (Temp up to 50 Deg. It can be part of a power factor correction and harmonic filtering system. Active Harmonic Filtering – Provides harmonic compensation by being installed on the line side of the offending load (for example, VSD). The customer is an Indian multinational provider of Information Technology (IT), networking technology solutions and Business Process Outsourcing (BPO) to the telecommunications industry. This new filtering solution offers the advantages of both types of filters and covers a wide range of power and performance levels. These filters are often called ‘detuned’ filters since they are not tuned to the exact harmonic order. Active Harmonic filter installation principle: These harmonic filters, when connected in parallel to the mains supply, offers many benefits. 519-1992: IEEE Recommended Practices and Requirements for Harmonic Control in Electric Power Systems, Ministry of Power (Central Electricity Authority) Notification No: 12/X/STD(CONN)/GM/CEA (21-Feb-07), The Central Electricity Authority (Technical Standards for Connectivity to the Grid) Regulations, 2007, Part IV: Grid Connectivity Standards applicable to the Distribution Systems and Bulk Consumers, Limit the harmonic current injection from customers so that they will not cause voltage distortion on the mains power supply, Limit the overall harmonic voltage distortion of the mains voltage provided by the power supplier, Real Power (Kilowatts or kW) which produces work, Reactive Power (Kilo Volt Amperes Reactive or KVAr) which generates the magnetic fields required, In inductive electrical equipment (AC motors, transformers, inductive furnaces, ovens, etc. Overloading, overheating and failure of power factor correction capacitors, distribution transformers and neutral conductors. Active filters work by electronically supplying the harmonic component of the current into a nonlinear load. Active Harmonic Filter Active Harmonic Filters (AHF) are static power electronic products that employ digital logic and IGBT semiconductors to synthesize a current waveform that is injected into the electrical network to cancel harmonic currents caused by nonlinear loads. Counter harmonics and reactive power control is generated by DSP and fed to power circuit Fundamental only Supply Active Filter i compensation i distortion Load • With this harmonics Abstract: Unlike traditional passive harmonic filters, modern active harmonic filters have the following multiple functions: harmonic filtering, damping,isolation and termination, reactive-power control for power factor correction and voltage regulation, load balancing, voltage-flicker reduction, and/or their combinations. The unit can integrate with various systems and applications as a centrally installed filter or be combined with a VLT® frequency converter as a packaged low harmonic drive solution. Total Demand Distortion (TDD) is almost similar to Total Harmonic Distortion (THD). Harmonic currents and voltages can cause many unfavourable effects on the power system itself and the connected loads. Similarly for inductive rectifier load, THD of source current before insertion of was 25.82 % and after the insertion of shunt active filter it reaches to 2.46 %. Active Filtering Working Principle Harmonic Current Source Powernac Active Filter Result ActiveFilteringPrinciple Active filters are power electronic devices connected in parallel with the load to be compensated.Thedevicecanbethoughtofas a controlled current source, which provides any kind of current waveform in real time. Fundamental frequency was … active harmonic Conditioners ( AHC ) as they are not tuned to 6.7 of. 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