Angebote zu "Harmonic" (16 Treffer)

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Hybrid Active Power Filter
68,00 € *
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Recent proliferation of non-linear loads such as adjustable-speed motor drives, power supplies and inverters have raised serious concerns on the quality and reliability of electrical distribution networks. These loads draw excessive harmonic currents which interact with a wide range of power system components, causing significant deterioration in the power quality. Although traditional passive filtering has been commonly used to mitigate these problems, recent advances in power electronic converters have sparked the interest in active power filter (APF) approach. This book describes the design, analysis and implementation of a hybrid APF connected to a photovoltaic system. The integration improves the harmonic filtering performance of a basic shunt APF while simultaneously supplying power from the photovoltaic array to the load. The compensation current reference for the APF is derived from the extension instantaneous reactive-power theorem. It simplifies the current reference estimation, leading to a more efficient implementation using digital signal processor.

Anbieter: Dodax
Stand: 23.01.2020
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Mitigation of Load Harmonics from Grid Connecte...
57,50 € *
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An effective technique to mitigate harmonics from grid connected wind turbines. The proposed method comprised of shunt active power filter (APF). The switching of APF is carried out by hysteresis band current controller. In order to validate the system performance, two reference current generation techniques have been used (pq theory and SRF theory). The results achieved from SRF theory were satisfied and more accurate as compared to pq theory. The proposed controller mitigates the harmonics and satisfies the international harmonic standard set in IEEE-519.

Anbieter: Dodax AT
Stand: 23.01.2020
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Mitigation of Load Harmonics from Grid Connecte...
55,90 € *
ggf. zzgl. Versand

An effective technique to mitigate harmonics from grid connected wind turbines. The proposed method comprised of shunt active power filter (APF). The switching of APF is carried out by hysteresis band current controller. In order to validate the system performance, two reference current generation techniques have been used (pq theory and SRF theory). The results achieved from SRF theory were satisfied and more accurate as compared to pq theory. The proposed controller mitigates the harmonics and satisfies the international harmonic standard set in IEEE-519.

Anbieter: Dodax
Stand: 23.01.2020
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Study and Simulation of Shunt Active Power Filter
37,00 € *
ggf. zzgl. Versand

Power quality and voltage/current harmonics have been matter of concern in most research on power networks since many years ago. This problem is aggravated in harmonic environment caused by power electronic converters. The harmonic components distort the ac current and voltage at the point of common coupling (PCC) and therefore affects the other adjacent loads connected to the same bus. Excessive reactive power demand increases feeder losses and reduces the active power flow capability of distribution system. Moreover, unbalancing affects the operation of transformers and generators. Presence of power filters using semiconductor switches has proved to be a solution to the electric distribution system facing these problems (reactive power, harmonics, and unbalanced loading). One of the equipment which is used to eliminate such harmonics is active power filter (APF) that is employed in many power networks and industries to suppress the current harmonics generated by nonlinear loads like rectifiers. The major issue related to the effective operation of APF is its controllability to compensate reactive power, harmonics, and unbalanced loading.

Anbieter: Dodax AT
Stand: 23.01.2020
Zum Angebot
Study and Simulation of Shunt Active Power Filter
35,90 € *
ggf. zzgl. Versand

Power quality and voltage/current harmonics have been matter of concern in most research on power networks since many years ago. This problem is aggravated in harmonic environment caused by power electronic converters. The harmonic components distort the ac current and voltage at the point of common coupling (PCC) and therefore affects the other adjacent loads connected to the same bus. Excessive reactive power demand increases feeder losses and reduces the active power flow capability of distribution system. Moreover, unbalancing affects the operation of transformers and generators. Presence of power filters using semiconductor switches has proved to be a solution to the electric distribution system facing these problems (reactive power, harmonics, and unbalanced loading). One of the equipment which is used to eliminate such harmonics is active power filter (APF) that is employed in many power networks and industries to suppress the current harmonics generated by nonlinear loads like rectifiers. The major issue related to the effective operation of APF is its controllability to compensate reactive power, harmonics, and unbalanced loading.

Anbieter: Dodax
Stand: 23.01.2020
Zum Angebot
Shunt Active Power Filter
50,40 € *
ggf. zzgl. Versand

In recent years there has been a substantial increase in the demand for controllable reactive power sources which can compensate for large lagging loads. These requirements involve precise and continuous reactive power control with fast response time and avoidance of harmonic line current generation. Solid state Var compensators using forced commutated converters have been developed and are being used for this purpose. Active power filtering (APF) can provide VAr compensation by injecting equal but opposite distortion at selected points in a network. The objective of this project is to design an Active Power Filter (APF) using Voltage Source Inverter (VSI) to achieve reactive power compensation. It is achieved by forcing the inverter line current to follow a reactive sinusoidal reference at a constant switching frequency. The current reference generator has been designed for both lagging and leading reactive power conditions. The reactive power requirements of a bridge rectifier connected load are estimated using the above current reference generator. Using this, an APF is designed to compensate the reactive power requirements of the above load.

Anbieter: Dodax AT
Stand: 23.01.2020
Zum Angebot
Shunt Active Power Filter
49,00 € *
ggf. zzgl. Versand

In recent years there has been a substantial increase in the demand for controllable reactive power sources which can compensate for large lagging loads. These requirements involve precise and continuous reactive power control with fast response time and avoidance of harmonic line current generation. Solid state Var compensators using forced commutated converters have been developed and are being used for this purpose. Active power filtering (APF) can provide VAr compensation by injecting equal but opposite distortion at selected points in a network. The objective of this project is to design an Active Power Filter (APF) using Voltage Source Inverter (VSI) to achieve reactive power compensation. It is achieved by forcing the inverter line current to follow a reactive sinusoidal reference at a constant switching frequency. The current reference generator has been designed for both lagging and leading reactive power conditions. The reactive power requirements of a bridge rectifier connected load are estimated using the above current reference generator. Using this, an APF is designed to compensate the reactive power requirements of the above load.

Anbieter: Dodax
Stand: 23.01.2020
Zum Angebot
Control Strategies of Different Loads to Enhanc...
79,10 € *
ggf. zzgl. Versand

The proposed shunt active filter compensate for balance and unbalanced nonlinear load currents, adapt itself to compensate variations in nonlinear load currents, and correct power factor of the supply side near to unity. Proposed Active Power Filter (APF) topology limits %THD of source current under limits of IEEE-519 standard, and also have been observed that reactive power compensation has improved leading to power factor improvement. After checking the performance of the system for various load conditions with the above said list of control strategies, the hybrid filter / control technique is observed as more adoptable for the system in order to ensure the improved power quality. The validity of the presented controllers was proved by simulation of a three phase four wire test system under balanced, unbalanced and variable loading conditions. Finally all the control strategies are compared and the results are found to be quite satisfactory to mitigate harmonic Distortions, reactive power compensation and power factor correction.

Anbieter: Dodax AT
Stand: 23.01.2020
Zum Angebot
Control Strategies of Different Loads to Enhanc...
76,90 € *
ggf. zzgl. Versand

The proposed shunt active filter compensate for balance and unbalanced nonlinear load currents, adapt itself to compensate variations in nonlinear load currents, and correct power factor of the supply side near to unity. Proposed Active Power Filter (APF) topology limits %THD of source current under limits of IEEE-519 standard, and also have been observed that reactive power compensation has improved leading to power factor improvement. After checking the performance of the system for various load conditions with the above said list of control strategies, the hybrid filter / control technique is observed as more adoptable for the system in order to ensure the improved power quality. The validity of the presented controllers was proved by simulation of a three phase four wire test system under balanced, unbalanced and variable loading conditions. Finally all the control strategies are compared and the results are found to be quite satisfactory to mitigate harmonic Distortions, reactive power compensation and power factor correction.

Anbieter: Dodax
Stand: 23.01.2020
Zum Angebot