A review of active filters for power quality improvement

Singh, Bhim; Al‐Haddad, Kamal; Chandra, Ambrish

doi:10.1109/41.793345

Cited by 1,959 publications

(755 citation statements)

References 188 publications

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“…Conventionally, passive LC filters are used to mitigate harmonic-related problems. However, due to their large size and inflexibility, passive filters are gradually being replaced by active filters that utilize power electronic inverters to provide compensation for harmonics [1] In Modern power quality electrical system, the power quality expressed as quality of voltage and quality of current are defines as "The measure, analysis and improvement of the bus voltage with sinusoidal wave form at rated voltage and constant frequency". There has been a sudden increase of non-linear loads, such as power supplies, adjustable speed drives etc.…”

Section: Inroductionmentioning

confidence: 99%

Ripple Reduction Using Seven-Level Shunt Active Power Filter for High-Power Drives

Kumar¹

2012

IJAREEIE

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This Paper proposes the high-power non-linear loads and high-power adjustable-speed motor drives, such as mainly used in electric novel ships, the shunt active power filter is proposed here to reduce the harmonic contents in source voltage and source currents of harmonic polluted three phase system supplying a Non-linear load and drives. The Shunt active filter is designed with Seven level cascaded H-bridge inverter. To handle the large compensation currents and provide better thermal management, two or more paralleled semiconductor switching devices can be used. In this paper two active filter inverters are connected with tapped reactors to share the compensation currents. Based on the joint redundant state selection strategy, a current balancing algorithm is proposed to keep the reactor magnetizing current to a minimum. The active filter topology can produce seven voltage levels. The harmonic filter reduces the harmonic contents in source currents as well as the source voltage multilevel shunt active filter does not require an interfacing transformer to connect it with the high power system. This is shown through simulation that the proposed active filter can achieve high overall system performance.

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Section: Inroductionmentioning

confidence: 99%

Ripple Reduction Using Seven-Level Shunt Active Power Filter for High-Power Drives

Kumar¹

2012

IJAREEIE

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“…Due to this fact, the compensation target is based on an ideal reference load, which must be resistive, balanced, and linear [5][6][7][8]. It means that the source currents are collinear to the supply voltages and the system will have unity power factor.…”

Section: B Compensation Strategymentioning

confidence: 99%

Analysis of Active and Passive Power Filters For Power Quality Improvement under Different Load Conditions

Ramana¹,

Chowdary²,

Ratnam³

2014

IJAREEIE

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ABSTRACT:In this work a new control strategy for simulation of three phase hybrid power filter for power quality improvement is adapted. This filter consists of shunt passive LC power filter and series active filter, with nonlinear balanced and unbalanced loads and also with variation in the source impedance. A new control method based on dual formulation of instantaneous reactive power vectorial theory is applied by considering a balanced and resistive load as reference load, so that the voltage waveform injected by the active filter is able to attain the objective of achieving reactive power compensation. This also helps in eliminating load current harmonics and also in balancing asymmetrical loads i.e., for achieving ideal behaviour for the set hybrid filter load, Total Harmonic Distortion (THD) is reduced and power factor is improved. This method improves passive filter compensation characteristics without depending on system impedance, avoids the danger of passive filter behaves as harmonic drain of close loads and avoiding series and / or parallel resonance problems. And compensation is also possible with variable loads without detuning the passive filter. And is applied for creating LG/LL faults at the source side. The results show that the active filter improves the compensation characteristics of the passive filter and reactive power is compensated.

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“…Because of these reasons, it has become imperative for the existing generation and transmission systems to use the most efficient way. Nowadays, increase in the use of power electronics based devices and non-linear loads cause many serious problems such as the harmonic distortion and power quality [1,2]. Passive and active power filters (APFs) are often used to solve these problems.…”

Section: Introductionmentioning

confidence: 99%

Robust control of shunt active power filter using interval type-2 fuzzy logic controller for power quality improvement

2017

Teh. vjesn.

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Original scientific paper It is well-known that shunt active power filter (SAPF) is widely used to reduce harmonic distortion and to compensate reactive power in electrical power systems. DC bus voltage control of SAPF is very important for excellent power quality. In the control of SAPF, DC bus voltage is controlled by conventional control methods such as PI and PID controllers. However, these controllers cannot give good results under transient and steady state conditions. Robust and intelligent controllers are required in order to improve performance of SAPF. In this paper, interval type-2 fuzzy logic system (T2FLS) that does not require mathematical model to be controlled system is preferred for control of DC bus voltage of SAPF and compared with type-1 fuzzy logic system (T1FLS). SAPF structures with both controllers are designed and simulated using MATLAB /Simulink environment. Simulation results have shown that SAPF structure with proposed controller has superior features than T1FLS in terms of fixed DC bus voltage, total harmonic distortion and power quality. Keywords: Interval Type-2 Fuzzy Logic Controller (T2FLS); power quality; reactive power compensation; Shunt Active Power Filter (SAPF)Robusno reguliranje usporedno aktivnog filtra snage pomoću regulatora neizrazite logike intervala tipa-2 za poboljšanje kvalitete energijeIzvorni znanstveni članak Dobro je poznato da se usporedno aktivni filtar snage (SAPF -Shunt Active Power Filter) uvelike koristi za smanjenje harmonijske distorzije i kompenzaciju reaktivne snage u elektroenergetskim sustavima. Regulator napona sabirnice istosmjerne struje SAPF-a vrlo je važan za odličnu kvalitetu snage. U reguliranju SAPF-a, napon sabirnice istosmjerne struje regulira se konvencionalnim metodama kao što su PI i PID regulatori. Međutim, ti regulatori ne mogu dati dobre rezultate u prijelaznim i stacionarnim uvjetima. Robusni i inteligentni regulatori potrebni su za poboljšanje performansi SAPF-a. U ovom radu, sustav neizrazite logike intervala tipa-2 (T2FLS) koji ne zahtijeva matematički model kao kontrolni sustav preferira se za reguliranje napona sabirnice istosmjerne struje SAPF-a i uspoređuje sa sustavom neizrazite logike tipa-1(T1FLS). Konstruirane su i simulirane strukture SAPF-a s oba regulatora primjenom MATLAB /Simulink okruženja. Rezultati simulacije su pokazali da SAPF struktura s predloženim regulatorom ima bolje karakteristike od T1FLS-a u odnosu na fiksni napon sabirnice istosmjerne struje, ukupno harmoničko izobličenje i kvalitetu snage.Ključne riječi: kompenzacija reaktivne snage; kvaliteta snage; regulator neizrazite logike intervala tipa-2; usporedno aktivni filtar snage

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A review of active filters for power quality improvement

Cited by 1,959 publications

References 188 publications

Ripple Reduction Using Seven-Level Shunt Active Power Filter for High-Power Drives

Ripple Reduction Using Seven-Level Shunt Active Power Filter for High-Power Drives

Analysis of Active and Passive Power Filters For Power Quality Improvement under Different Load Conditions

Robust control of shunt active power filter using interval type-2 fuzzy logic controller for power quality improvement

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