Santanu Kumar Dash

Comparative performance analysis of Shunt Active power filter and Hybrid Active Power Filter using FPGA-based hysteresis current controller

This paper describes the performance analysis of single phase Shunt Active power filter (SAPF) verses Hybrid Active Power Filter (HAPF) using Simulink and Xilinx System Generator as a design platform. At the present age, elimination of harmonics produced by the nonlinear loads to improve the power quality is a great issue. To overcome the problem due to harmonics, Active Power Filters (APFs) are used with various control schemes. But Hybrid Active power filter is a power electronic device which has both the characteristics of passive power filters and active power filters, helps in cancellation of the harmonics by producing compensating signal. The digital controller design and its simulation are presented for both the filter types, showing acceptable THD results for the word length used in the fixed-point computations involved in the switching sequence generation.

Design and Analysis of Grid Connected Photovoltaic Fed Unified Power Quality Conditioner

Abstract This paper proposes the integration scheme and operation of the Unified Power Quality conditioner (UPQC) with Photovoltaic source as distributed generations for power quality improvement. Thus, it provides a novel PV-grid integration configuration and prevents any adverse situation related to current or voltage in power system. Voltage related issues are maintained by the series part of UPQC and the current related issues are handles by shunt part of the UPQC. The various operation modes of PV-UPQC schemes are broadly classified according to the direction of power flow, (i) Interconnected mode, (ii) Islanding mode. PV-UPQC has advantage over the conventional UPQC scheme as it has developed the capability to compensate the voltage interruption problems Control algorithms for shunt and series part of the UPQC is implemented. Development of the proposed configuration has been designed in the laboratory with control algorithm implemented in dSPACE and results are discussed.

Platform Specific FPGA Based Hybrid Active Power Filter for Power Quality Enhancement

Abstract Elimination of harmonics by the use of power filters is required for power quality improvement; provides a wide area for the researchers to develop efficient power filters with improved control platforms. This paper motivates the implementation of the embedded control platform for better control of the power filters for faster elimination of harmonics. Although many embedded processors fascinates the implementation of the control techniques but finding the feasible platform is a great task. Software implementations are feasible for most of the power electronics converters but the hardware design with required digital hardware is a challenging task. The present paper deals with the development of the control technique for the Hybrid Active Power Filter with Xilinx System Generator Platform. The virtual FPGA (Field Programmable Gate Array) platform provided by the Xilinx System Generator has the ability to generate better switching signals for the control of the power filter to generate compensating signal for elimination of harmonics to maintain the power quality in the distribution lines. Experimental results obtained by the setup developed in the Power System Laboratory presents the effectiveness of the Embedded Platform. Various source voltage conditions also simulated and performance is verified for the developed Hybrid Active Power Filter.

DS1103 real-time operation and control of Photovoltaic fed unified power quality conditioner

The unified power quality conditioner is an efficient power device which plays active role in elimination of various power quality issues in the power system. Although voltage sag, swell and current harmonics are dealt by UPQC, voltage interruption issues are remaining unsolved. This paper proposes the photovoltaic source integration to the grid through the UPQC. Conventional Photovoltaic grid integration schemes are inefficient to deal with all power quality issues. The present scheme eliminates the limitation of conventional PV grid integration and UPQC performance. Real-time implementation of the PV-UPQC scheme has been developed in the laboratory. Hall Effect sensors are built and DS1103 controller has been used for control algorithm implementation. Experimental results are analyzed for efficient PV-UPQC operation.

Performance Improvement of Hysteresis Current Controller Based Three-Phase Shunt Active Power Filter for Harmonics Elimination in a Distribution System

Performance investigation of Shunt Active Power Filter for harmonic elimination is an interdisciplinary area of interest for many researchers. This paper presents performance improvement of 3-phase Shunt Active Power Filter with Hysteresis Current Control technique for elimination of harmonic in a 3-phase distribution system. The insulated gate bipolar transistor based Voltage Source Inverter with a dc bus capacitor is used as active power filter. The shunt active filter employs a simple method called synchronous detection technique for reference current gene-ration. Two level hysteresis current controller is proposed for voltage source inverter switching signal generation which helps in tuning of Active Power Filter. Shunt Active power filter generates compensating signal which reduces the harmonic content of the system and improve the system performance. Shunt active power filter is modeled and investigated under non-linear load condition using MATLAB/Simulink.Various simulation results are presented to verify the improvement of performance by using shunt active power filter with hysteresis current controller for the distribution system.

Analysis and Operation of FPGA-based Hybrid Active Power Filter for Harmonic Elimination in a Distribution System

This paper describes the design of Hysteresis Current Controller (HCC) for a single-phase Hybrid Active Power Filter (HAPF) using Simulink and Xilinx System Generator as a design platform. At the present age, elimination of harmonics produced by the nonlinear loads to improve the power quality is a great issue. To overcome the problem due to harmonics, Active Power Filters (APFs) are used with various control schemes. But Hybrid Active power filter is a power electronic device which has both the characteristics of passive power filters and active power filters, helps in cancelation of the harmonics by producing compensating signal. The digital controller design and its simulation are presented, showing acceptable THD results for the word length used in the fixed-point computations involved in the switching sequence generation.

Photovoltaic tied unified power quality conditioner topology based on a novel notch filter utilized control algorithm for power quality improvement

Nonlinear loads and grid side disturbances in the power distribution network cause harmonic rich currents and voltage perturbations such as voltage harmonics, voltage sags and voltage swells. The unified power quality conditioner (UPQC) with shunt inverter and series inverter are usually employed for elimination of current and voltage related power quality issues. However, elimination of voltage and current quality issues in a grid connected Photovoltaic (PV) system is essential. Therefore, PV integrated UPQC topology is proposed in this paper with a novel controller for power quality improvement. The control algorithm based on notch filter Phase Locked Loop (PLL) is utilized for proper phase detection and elimination of voltage and current disturbances. PV tied UPQC controller based on notch filter PLL has the capability to avoid multiple zero crossing during highly distorted grid voltage condition. Conventional control algorithms such as synchronous reference frame theory, unit vector controller based on traditional PLL are also analyzed for the control of PV tied UPQC. The proposed system is developed in Matlab/Simulink and the results obtained are evaluated to measure the performance. A real-time hardware prototype is developed using dSPACE processor. The obtained experimental results validate the efficiency of the proposed controller for PV tied UPQC.

UPQC-PV solving Power Quality issues based on system Generator FPGA controller

This Paper presents novel FPGA based control platform for PV fed Unified Power Quality Conditioner (PV-fed UPQC). Concept of PV-UPQC integration; Control algorithms and its implementation through FPGA based controller is discussed here. FPGA based control platform through Xilinx system Generator is adopted over the conventional way of design. Conventional UPQC is unable to provide solutions for voltage interruption issues. However PV-UPQC configuration improves the power quality in the power system by compensating the current harmonics; voltage sags/swells and voltage interruption. The operation of PV-UPQC configuration is simulated through Xilinx system generator environment and results are presented. Experimental setup of PV-UPQC is developed in the laboratory for verification.

A TLBO optimized photovoltaic fed DSTATCOM for power quality improvement

A common practice of obtaining the values for filter parameters and gains of proportional plus integral (PI) controller is to use a linear model of the distributed static compensator (DSTATCOM). The values so obtained produces perfect harmonic cancellation (PHC) and unity power factor (UPF) for balanced and sinusoidal supply voltages based photovoltaic fed DSTATCOM (PV-DSTATCOM). However when supply voltages are distorted; PV-DSTATCOM may not produce PHC along with UPF due to non-linear behavior of the passive filter parameters. Hence; there should be an optimal calculation for filter parameters and PI controller gains; so that the PV-DSTATCOM can deliver optimal performance under distorted supply voltages. This paper presents a new algorithm based on teaching-learning behavior inside a classroom; to optimize the gains of PI controller and filter parameters. Through simulation results; it is observed that the optimization based control algorithm performs quite satisfactorily under sinusoidal as well as distorted supply voltage conditions. The proposed teaching-learning optimization based PV-DSTATCOM is compared with grenade explosion method (GEM) and found to converge faster than GEM to reach the global optimum solution.

Photovoltaic tied unified power quality conditioner for mitigation of voltage distortions

Critical Loads at the consumer end has increased the concerns of researchers to find a better solution for mitigation of the power quality issues. Present paper shows motivation towards the development of present and future grid connected Photovoltaic systems. Photovoltaic system is connected to the grid by the DC-link capacitance of the Unified Power Quality Conditioner which has the capability to overcome the voltage and current power quality issues. In this paper mitigation of voltage sags and swells elimination perfectly done as well as voltage harmonics. However PV fed UPQC has the capability to maintain the load voltage even at the time of interruption from the source grid Control algorithm has been implemented for both series and shunt part of the UPQC. Simulation results are verified through development of Laboratory prototype.