Hierarchical coordinated control of distributed generators and active power filters to enhance power quality of microgrids

2017 ◽

Vol 8 (3) ◽

pp. 1441

Author(s):

Yadiki Rajendra Babu ◽

C. Srinivasa Rao

Keyword(s):

Power Quality ◽

Distributed Generation ◽

Active Power ◽

Harmonic Compensation ◽

Active Power Filters ◽

Power Filters ◽

Electrical Engineers ◽

Quality Issues ◽

Compensating Devices

<span>Power quality issues are the most concerned area for electrical engineers in these modern days due to indusrtrialization and advancements in electronics. Harmonics are one of the power quality issues that deteriorated the quality of source components delivered to load. Active power filters (APF) are the compensating devices used to mitigate harmonics. Distributed generation (DG) became a trendline due to economical, technical and environmental reasons. This paper presents the harmonic compensation using dual APF sharing compensating signals while active power is fed from distributed generation to grid. DG inverter acts as an interface between DG system and grid to feed active power from DG to grid. In this context, the DG inverter acts both as inverter and APF, used as inverter to invert supply from DG and feeds grid for specified time and also as APF for harmonic compensation thereafter along with dual APF. The proposed system is developed and results are obtained using MATLAB/SIMULINK software. Results are shown for DG inverter feeding active power to grid and also acting as APF. Dual APF characteristics are also shown. </span>

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Design of a Measuring System for Electricity Quality Monitoring within the SMART Street Lighting Test Polygon: Pilot Study on Adaptive Current Control Strategy for Three-Phase Shunt Active Power Filters

Sensors ◽

10.3390/s20061718 ◽

2020 ◽

Vol 20 (6) ◽

pp. 1718 ◽

Cited By ~ 6

Author(s):

Radek Martinek ◽

Petr Bilik ◽

Jan Baros ◽

Jindrich Brablik ◽

Radana Kahankova ◽

...

Keyword(s):

Power Quality ◽

Control Strategy ◽

Active Power ◽

Current Control ◽

Measuring System ◽

Street Lighting ◽

Active Power Filters ◽

Power Filters ◽

Three Phase

This study focuses on the design of a measuring system for monitoring the power quality within the SMART street lighting test polygon at university campuses with relation to testing an adaptive current control strategy for three-phase shunt active power filters. Unlike conventional street lighting, SMART elements are powered 24/7. Due to the electronic character of the power part of such mass appliances, there are increased problems with the power quality of the electric energy. Compared to the current concept of street lighting, there is a significant increase in the content of higher current harmonic components, which cause several problems in the distribution system. The test polygon contains 16 luminaires made by various manufacturers and mounted with various SMART components. Using the polygon control and monitoring system, dynamic load scenarios were selected. These scenarios tested the possibilities of different adaptive current control strategies for three-phase shunt active power filters to improve the power quality of electricity. This study focuses on three adaptive algorithms that respond to dynamic changes of current harmonics level in real-time. The possibility of active filter control was tested using FPGA, mainly due to the low latency of the filter control part.

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Power Quality Improvement of High Voltage DC Link using Modified Shunt Active Power Filter

Al-Kitab Journal for Pure Sciences ◽

10.32441/kjps.v1i1.91 ◽

2018 ◽

Vol 1 (1) ◽

pp. 54-66

Author(s):

Rakan Khalil Antar ◽

Basil Mohammed Saied ◽

Rafid Ahmed Khalil

Keyword(s):

Power Quality ◽

High Voltage ◽

Pulse Width Modulation ◽

Active Power Filter ◽

Active Power ◽

Voltage Source ◽

Active Power Filters ◽

Power Filter ◽

Power Filters ◽

Power Quality Improvement

A new control strategy for active power filters is proposed, modeled and implemented in order to improve the power quality of a line commutated converter High voltage DC link. The ability of reactive power and harmonics reductions are generally met by using passive and active power filters. In this paper, modified active power filter with a modified harmonics pulse width modulation algorithm is used to minimize the source harmonics and force the AC supply current to be in the same phase with AC voltage source at both sending and receiving sides of a line commutated converter high voltage DC link. Therefore, it is considered as power factor corrector and harmonics eliminator with random variations in the load current. The modified harmonics pulse width modulation algorithm is applicable for active power filter based on a three-phase five-level and seven-level cascaded H-bridge voltage source inverter. Simulation results show that the suggested modified multilevel active power filters improve total harmonics distortion of both voltage and current with almost unity effective power factor at both AC sides of high voltage DC link. Therefore, modified active power filter is an effective tool for power quality improvement and preferable for line commutated converter high voltage DC link at different load conditions.

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