Soumya Mishra

Power Quality Improvement Using Photovoltaic Fed DSTATCOM Based on JAYA Optimization

In this paper, a new optimization technique namely JAYA is proposed to optimize the coefficients of proportional plus integral controller and filter parameters of photovoltaic fed distributed static compensator (PV-DSTATCOM). The JAYA is a new optimization tool whose performance is independent of the algorithm-specific control parameters. It overcomes the limitations of others in terms of attaining global optima with reduced computational effort. From the obtained simulation and experimental results, the performance of JAYA optimized PV-DSTATCOM has been found quite satisfactory and stimulating as compared to grenade explosion method and teaching-learning based optimized PV-DSTATCOM.

Improvement of power quality using an average model of a new hybrid PV-DSTATCOM

This paper presents a step by step modeling of a new improved hybrid photovoltaic fed distributed static compensator (PV-DSTATCOM) in a-b-c reference frame. Further the system average model is transformed to orthogonal synchronous (d-q) reference frame. The new improved PV-DSTATCOM is used to compensate the current distortion and reactive power, generated by a non-linear three phase bridge uncontrolled rectifier with ohmic-inductive load. For perfect harmonic compensation (PHC) and unit power factor (UPF) a multi-loop control scheme is employed in which the inner controller ensures the current harmonic and reactive power compensation, and the outer controller takes care of the voltage regulation at the dc side of PV-DSTATCOM. The presented system is implemented using MATLAB/Simulink tool and the performance is discussed through obtained simulation results. Furthermore an experimental setup is developed and the efficacy of the system is verified under practical limitations. Both the simulation and experimental results confirm the effectiveness of the presented system under ideal and distorted supply voltage.

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.

Power quality improvement with shunt active filter under various mains voltage using Teaching Learning Based optimization

In this paper, instantaneous reactive power theory based a modified control algorithm is implemented for 3-phase 3-wire shunt active power filter to suppress harmonics and reactive power under non ideal source voltage. The reference current signals are generated by sensing the source voltage, load current and dc bus voltage. With these signals the gate driving pulses are generated via hysteresis band current controller. To check robustness of the control algorithm four different cases such as unbalanced, balanced distorted, unbalanced distorted main voltage and faults on load are considered. For more improvement in the performance of active filter, the Active filter is optimized with Teaching-Learning-Based optimization. The simulation work is carried out in MATLAB/SIMULINK Power system block set. The performance of the implemented algorithm with Teaching-Learning-Based optimization is found quite effective and satisfactory under these conditions.

Improvement of power quality using photovoltaic fed shunt power quality conditioner

A photovoltaic fed shunt power quality conditioner for harmonic and reactive power compensation is presented in this paper. A new control algorithm based on load active power consumption is implemented to improve the performance of the current controller under non-sinusoidal mains voltage condition. The presence of solar system decreases the voltage stress on the conventional supply system and also compensates a part of load active power during the availability of sunlight. A fixed band hysteresis current controller is used to generate switching pulses of insulated-gate bipolar transistor inverter. The concept is realised by time domain computer simulation of the model under different mains voltage, symmetrical and unsymmetrical fault on load and dynamic load condition. The viability and effectiveness of the designed PVSAF and its competence in meeting the IEEE-519 recommended harmonic standard limits is also verified through experimentation.

Detection of partial discharges and its effect on solid insulation used in high voltage cable

Most of the high voltage (HV) power equipment is made up with solid insulation like paper insulation, glass insulation, epoxy insulation etc. The oldest kind of insulating material among all insulation, the paper insulation is used in cable and nowadays the Cross linked Polyethylene (XLPE) is commonly used for cable insulation. The presence of impurities in the insulation system is one of the root causes of insulation failure as they are form a weak zone inside the healthy insulation system. Therefore, early identification of degradation process like formation of electrical tree structures inside such solid electrical insulation due to high voltage tress during its operating life is utmost requirement to prevent the electrical power equipment from a sudden and complete insulation failure. To study the growth mechanism of electrical tree structure inside the insulation with different applied high voltage a commonly used insulating material like XLPE insulation in HV power cable are consider for this present work. This work also describes the ageing process by conducting the partial discharge (PD) test on the same insulating materials. Finally, the effect of PD on insulation i.e., formation of electrical tree structure on solid insulation was observed by using Scanning Electron Microscope (SEM) and analyzed.

Atonement of harmonics and reactive power with three phase SAPF under sundry source voltage

In this paper, instantaneous reactive power theory (IRP), also known as p-q theory based a new control algorithm is presented for 3-phase 3-wire and 3-leg shunt active power filter (SAPF) to suppress harmonic currents and compensate reactive power under non ideal voltage sources. The reference current signals are generated by sensing the source voltage, load current and dc bus voltage. With these signals the driving signals are generated via hysteresis band PWM current controller. To check robustness of the control algorithm four different cases such as ideal, unbalanced, balanced distorted and unbalanced distorted main voltage are considered and simulated with different firing angle of the load. The simulation work is carried out in MATLAB/SIMULINK Power system block set. The performance of the proposed algorithm is found quite effective and satisfactory under non-ideal main voltage conditions.