The Experts below are selected from a list of 4164 Experts worldwide ranked by ideXlab platform
Bhim Singh - One of the best experts on this subject based on the ideXlab platform.
-
adaptive damped circular current limit control for pv grid tied system
IEEE Industry Applications Society Annual Meeting, 2019Co-Authors: Sudip Bhattacharyya, Shailendra Kumar, Bhim SinghAbstract:This paper proposes a double stage PV (Photo-Voltaic)-grid tied three-phase system with higher order passive Filter. It gives a solution of some real issues such as power factor improvement, load balancing, compensation harmonics, reduced Filter size and power loss in distribution network. The Ripple Filter is used in the front end of the voltage source converter (VSC) for eliminating the switching harmonics at the point of common coupling (PCC), with very small value of inductor as compared to regular interfacing inductor. The adaptive damped circular current limit control (ADCCL) Filter based technique is used for harmonics elimination in a double-stage grid-connected PV system. The maximum power is tracked from a PV array by an incremental conductance (INC) maximum power point tracking (MPPT) algorithm. However, the boost converter is used for extracting the maximum power from the PV array and feeds it to the grid and the input DC voltage of the voltage source converter (VSC) is maintained at desired level by using a proportional integral (PI) controller. The ADCCL control maintains the balanced grid currents, and injects the active power to the grid, eliminates the harmonics current caused by nonlinear unbalanced loads connected at PCC. This system maintains the grid current total harmonic distortion (THD) in accordance to the IEEE 519 standard. For improving the dynamic response, a PV feed-forward term is used. This control improves the power quality as load balancing, power factor correction and good dynamic response. Test results demonstrate reactive power compensation of balanced and unbalanced nonlinear loads. Moreover, a comparison is made with different controls.
-
An Adaptive Control Scheme of SPV System Integrated to AC Distribution System
IEEE Transactions on Industry Applications, 2017Co-Authors: Shailendra Kumar, Bhim Singh, Ikhlaq Hussain, Ambrish Chandra, Kamal Al-haddadAbstract:This paper presents a single-stage solar photovoltaic (SPV) system utilizing an adaptive control scheme. The SPV system includes SPV array, voltage source converter (VSC), Ripple Filter, nonlinear loads, and a distribution network. The proposed SPV system feeds the active power to the distribution system, provides an effective use of SPV array and mitigation of load harmonics currents. The SPV system with an incremental conductance based control scheme is used for obtaining the maximum power from the SPV array and an adaptive control scheme to control the switching pulses of the VSC. In addition, it utilizes a SPV feed-forward loop to improve the dynamic response and reduces the burden on the proportional-integral controller by regulating dc bus voltage. Test results are presented to validate the control, design, and response of SPV system with various states.
-
Real-time implementation of SPV system with DSTATCOM capabilities in three-phase four-wire distribution system
Iet Generation Transmission & Distribution, 2017Co-Authors: Shashwat Shivam, Ikhlaq Hussain, Bhim SinghAbstract:This study deals with a real-time implementation of solar photovoltaic (SPV) grid integrated system possessing distributed static compensator (DSTATCOM) capabilities with three-phase four-wire voltage source converter (VSC) topology using least mean eighth control algorithm. The proposed system has an SPV array, a VSC, three single-phase non-linear loads connected to the grid and a Ripple Filter. The SPV and VSC together behave as a DSTATCOM and additionally supplies SPV power to the grid. The DSTATCOM reduces the total harmonic distortion of the grid currents, maintains the voltage of point of common coupling and improves the power factor. The maximum extraction of incident solar power on SPV array is achieved through an incremental conductance maximum power point tracking technique. The behaviour of the system is studied by developing a prototype with an SPV array simulator.
-
Dual-sign error based adaptive control for three phase grid tied SECS with DSTATCOM capabilities
2016 IEEE International Conference on Power Electronics Drives and Energy Systems (PEDES), 2016Co-Authors: Shashwat Shivam, Ikhlaq Hussain, Bhim SinghAbstract:This paper proposes the use of a dual-sign error control algorithm for a single stage, three phase, grid-integrated solar energy conversion system (SECS) with DSTATCOM (Dynamic Static Compensator) capability. The system consists of an SPV (Solar Photovoltaic) array, a voltage source converter (VSC), three phase non-linear load connected to the grid and a Ripple Filter. The VSC and the SPV array provide an active power to the grid and act as a DSTATCOM. This reduces the THD (Total Harmonic Distortion) introduced in the grid currents due to the nonlinear and unbalanced loads. It improves the power factor and maintains the voltage of the PCC (Point of Common Coupling). The extraction of maximum power incident on the SPV array is ensured by P&O (Perturb and Observe) algorithm for MPPT (Maximum Power Point Tracking). This system is studied by implementing a prototype using a SPV array simulator.
-
A cross correlation control approach for multifunctional SPV system
2016 IEEE 6th International Conference on Power Systems (ICPS), 2016Co-Authors: Bhim Singh, Sanjay Kumar, Shailendra Dwivedi, Ikhlaq Hussain, Chinmay JainAbstract:This work presents a two stage grid connected three-phase, four-wire (3P4W) SPV system using cross correlation control algorithm. This system not only feeds the power to the grid but it also helps in power factor correction and harmonics elimination. The proposed system includes the SPV string, a DC-DC boost converter, a voltage source converter (VSC), Ripple Filter and linear/nonlinear loads. For extracting maximum power from the PV string, a perturb and observe based MPPT algorithm is utilized. The fourth leg of the VSC is utilized for mitigation of neutral current at PCC in a 3P4W distribution network. A prototype of proposed system is realized in the laboratory and proposed control algorithm is experimentally verified on this developed system.
Chunting Mi - One of the best experts on this subject based on the ideXlab platform.
-
three level inverter based shunt active power Filter in three phase three wire and four wire systems
IEEE Transactions on Power Electronics, 2009Co-Authors: O Vodyakho, Chunting MiAbstract:This paper presents a direct current-space-vector control of an active power Filter (APF) based on a three-level neutral-point-clamped (NPC) voltage-source inverter. The proposed method indirectly generates the compensation current reference by using an equivalent conductance of the fundamental component using APF's dc-link voltage control. The proposed control can selectively choose harmonic current components by real-time fast Fourier transform to generate the compensation current. The compensation current is represented in a rotating coordinate system with chosen switching states from a switching table implemented in a field-programmable gate array. In addition, a three-phase four-wire APF based on a three-level neutral-point-clamped inverter is also presented. The proposed APF eliminates harmonics in all three phases as well as the neutral current. A three-phase three-wire NPC inverter system can be used as a three-phase four-wire system since the split dc capacitors provide a neutral connection. To regulate and balance the split dc-capacitor voltages, a new control method using a sign cubical hysteresis controller is proposed. The characteristics of the APF system with an LCL-Ripple Filter are investigated and compared with traditional current control strategies to evaluate the inherent advantages. The simulation and experimental results validated the feasibility of the proposed APF.
O Vodyakho - One of the best experts on this subject based on the ideXlab platform.
-
three level inverter based shunt active power Filter in three phase three wire and four wire systems
IEEE Transactions on Power Electronics, 2009Co-Authors: O Vodyakho, Chunting MiAbstract:This paper presents a direct current-space-vector control of an active power Filter (APF) based on a three-level neutral-point-clamped (NPC) voltage-source inverter. The proposed method indirectly generates the compensation current reference by using an equivalent conductance of the fundamental component using APF's dc-link voltage control. The proposed control can selectively choose harmonic current components by real-time fast Fourier transform to generate the compensation current. The compensation current is represented in a rotating coordinate system with chosen switching states from a switching table implemented in a field-programmable gate array. In addition, a three-phase four-wire APF based on a three-level neutral-point-clamped inverter is also presented. The proposed APF eliminates harmonics in all three phases as well as the neutral current. A three-phase three-wire NPC inverter system can be used as a three-phase four-wire system since the split dc capacitors provide a neutral connection. To regulate and balance the split dc-capacitor voltages, a new control method using a sign cubical hysteresis controller is proposed. The characteristics of the APF system with an LCL-Ripple Filter are investigated and compared with traditional current control strategies to evaluate the inherent advantages. The simulation and experimental results validated the feasibility of the proposed APF.
Hirofumi Akagi - One of the best experts on this subject based on the ideXlab platform.
-
A Transformerless Hybrid Active Filter Capable of Complying with Harmonic Guidelines for Medium-Voltage Motor Drives
Ieej Transactions on Industry Applications, 2009Co-Authors: Ryota Kondo, Hirofumi AkagiAbstract:This paper presents a transformerless hybrid active Filter that is integrated into medium-voltage adjustable-speed motor drives for fans, pumps, and compressors without regenerative braking. The authors have designed and constructed a three-phase experimental system rated at 400V and 15kW, which is a downscaled model from a feasible 6.6-kV 1-MW motor drive system. This system consists of the hybrid Filter connecting a passive Filter tuned to the 7th harmonic Filter in series with an active Filter that is based on a three-level diode-clamped PWM converter, as well as an adjustable-speed motor drive in which a diode rectifier is used as the front end. The hybrid Filter is installed on the ac side of the diode rectifier with no line-frequency transformer. The downscaled system has been exclusively tested so as to confirm the overall compensating performance of the hybrid Filter and the Filtering performance of a switching-Ripple Filter for mitigating switching-Ripple voltages produced by the active Filter. Experimental results verify that the hybrid Filter achieves harmonic compensation of the source current in all the operating regions from no-load to the rated-load conditions, and that the switching-Ripple Filter reduces the switching-Ripple voltages as expected.
-
A proposal of a 3.3-kV/6.6-kV transformerless hybrid Filter, and experimental verification based on a 200-V laboratory system
Electrical Engineering in Japan, 2003Co-Authors: S Srianthumrong, Yasuhiro Tamai, Hirofumi AkagiAbstract:This paper proposes a transformerless shunt hybrid Filter for harmonic compensation of a three-phase six-pulse diode rectifier, where the AC line-to-line voltage is 3.3 or 6.6 kV. The hybrid Filter consists of a single tuned LC Filter per phase and an active Filter with a DC capacitor voltage as low as 300 or 600 V. The two Filters are directly connected in series with each other without a transformer. The passive Filter absorbs harmonic currents produced by the rectifier, whereas the active Filter improves the Filtering characteristics of the passive Filter. The required rating of the active Filter is much smaller than that of a conventional shunt active Filter used alone. Another advantage is that no additional switching-Ripple Filter is required for the active Filter because the LC Filter acts not only as a tuned LC Filter around the seventh-harmonic frequency but also as a switching-Ripple Filter around 10 kHz. A feedforward control scheme is also proposed to improve the active Filter performance. Experimental results obtained from a 200-V, 5-kW laboratory system and simulation results of a 3.3-kV, 300-kW system confirm the validity and effectiveness of the system. The hybrid Filter gives satisfactory compensation performance, thus allowing us to put it into practical use. © 2003 Wiley Periodicals, Inc. Electr Eng Jpn, 146(2): 54–65, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/eej.10236
-
A Proposal of a 3.3-kV/6.6-kV Transformerless Hybrid Filter, and Experimental Verification Based on a 200-V Laboratory System
Ieej Transactions on Industry Applications, 2002Co-Authors: S Srianthumrong, Yasuhiro Tamai, Hirofumi AkagiAbstract:This paper proposes a transformerless shunt hybrid Filter for harmonic compensation of a three-phase six-pulse diode rectifier, where the ac line-to-line voltage is 3.3kV or 6.6kV. The hybrid Filter consists of a single tuned LC Filter per phase and an active Filter with a dc capacitor voltage as low as 300V or 600V. The two Filters are directly connected in series with each other without any transformer. The passive Filter absorbs harmonic currents produced by the rectifier, whereas the active Filter improves the Filtering characteristics of the passive Filter. The required rating of the active Filter is much smaller than that of a conventional shunt active Filter used alone. In addition, no additional switching-Ripple Filter is required for the active Filter, because the LC Filter acts not only as a tuned LC Filter around the 7th-harmonic frequency but also as a switching-Ripple Filter around 10kHz. A feedforward control scheme is also proposed to improve the active Filter performance. Experimental results obtained from a 200-V, 5-kW laboratory system and simulation results of a 3.3-kV, 300-kW system confirm the validity and effectiveness of the system. The hybrid Filter gives satisfactory compensation performance, thus allowing us to put it into practical use.
-
a medium voltage transformerless ac dc power conversion system consisting of a diode rectifier and a shunt hybrid Filter
IEEE Industry Applications Society Annual Meeting, 2002Co-Authors: S Srianthumrong, Hirofumi AkagiAbstract:This paper proposes a 3.3-kV transformerless AC-to-DC power conversion system consisting of a three-phase six-pulse diode rectifier and a shunt hybrid Filter. The hybrid Filter is formed by a single tuned LC Filter per phase and a small-rated three-phase active Filter, which are directly connected in series without any matching transformer. The required rating of the active Filter is much smaller than that of a conventional standalone active Filter be. In addition, no additional switching-Ripple Filter is required for the hybrid Filter because the LC Filter functions not only as a harmonic Filter tuned at the seventh harmonic frequency but also as a switching-Ripple Filter around 10 kHz. Experimental results obtained from a 200-V 5-kW laboratory system and simulation results of a 3.3-kV 300-kW system confirm the validity and effectiveness of the system.
D.c. Hamill - One of the best experts on this subject based on the ideXlab platform.
-
An efficient active Ripple Filter for use in DC-DC conversion
IEEE Transactions on Aerospace and Electronic Systems, 1996Co-Authors: D.c. HamillAbstract:When low Ripple is required from a switched mode dc-dc converter, dissipative active Filters offer an alternative to passive LC and coupled inductor Filters. Analytical and experimental results are presented for a simple active Ripple Filter. The Filter employs a pair of current transformers as sensors for feedforward and feedback control and two metal-oxide-semiconductor field-effect transistors (MOSFETs) as cancellation current drivers. Measurements demonstrate good Ripple attenuation up to 5 MHz, more than 70 dB being obtained at 100 kHz, the switching frequency of a test converter. The overall efficiency was measured as 95%, with room for further improvement. The Filter is suitable for input and output smoothing in dc-dc converters for aerospace and other critical applications.
-
Analysis and design of an active Ripple Filter for DC-DC applications
Proceedings of 1995 IEEE Applied Power Electronics Conference and Exposition - APEC'95, 1995Co-Authors: D.c. HamillAbstract:When low Ripple is required from a DC-DC converter, active Filters offer an alternative to passive LC and coupled inductor Filters. A simple experimental active Ripple Filter is presented, which employs a pair of current transformers as sensors for feedforward and feedback control and two MOSFETs as cancellation current drivers. Measurements demonstrate good Ripple attenuation: more than 70 dB at 100 kHz, and 23 dB at 1 MHz. The overall efficiency was measured as 95%, but could be improved by attention to the auxiliary supplies to around 98%. The Filter is suitable for input and output smoothing in aerospace and other critical applications.
