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An EV (Electric Vehicle) could play a prominent role in transport sector in terms of cost benefit and environment issues. A battery charger must have high efficiency and dependability with a unity power factor current drawn at its input AC mains since it is directly going to affect the charging time and life of the battery used in EV. Conventional AC-DC converter uses a diode bridge rectifier at the...
Unintentional islanding is one of the major concerns associated with integration of large solar photovoltaic generation with the power distribution network. However the issue of islanding needs to be comprehensively understood and managed given a challenging scenario ahead. This demands transition towards predictive approaches rather than the prevalent reactive ones for island detection and system...
This paper presents a photovoltaic (PV) integrated unified power conditioner (UPC) system that provides power quality enhancement as well as real power sharing. The shunt inverter of the PV integrated UPC system provides compensation for the harmonics present in the source current and reactive power while the series inverter compensates for voltage harmonics, voltage sags and swells. A novel control...
In this paper, the attributes of the nonlinear load like power, power factor, harmonic and interharmonic frequency component, power spectrum and impulse responses are evaluated using correlation coefficients and Estimation of signal parameters via rotational invariance technique. This novel technique is established, also more useful in analyzing nonlinear load and designing the harmonic filters at...
In hybrid microgrids, integration of the low voltage renewable energy sources to high voltage AC and DC buses of grid requires a multiple voltage conversions. These conversions include low voltage to medium voltage and medium voltage to high voltage. When the number of conversions are increased the device count increases and power quality decreases. With this intent, this paper proposes a DC-AC/DC...
Multilevel inverter enables to completely remove the passive filtering requirement at the grid interfacing end, resulting in improved efficiency and reduced cost. These features have led to increasing attention towards their application to medium and high-power arena. In this paper, investigation of a hybrid 9-level inverter topology for grid integration of renewable energy sources is presented. The...
This paper proposes a solar photovoltaic (PV) fed water pumping system driven by a brushless DC (BLDC) motor. A promising case of interruption in the water pumping due to the intermittency of PV power generation is resolved by using a power grid as an external power backup. The power is drawn from the grid in case the PV array is unable to meet the required power demand, otherwise the PV array is...
This paper presents the analysis, design and comparison of performance of a scheme for power factor correction for the brushless dc motor drive. A front end diode bridge rectifier (DBR) with dc link capacitor at the input side of brushless dc motor (BLDC) draws peaky current which then leads to high value of Total Harmonics Distortion (THD) and poor power factor. This problem can be eliminated by...
This paper presents the performance analysis of a single phase UPQC (unified power quality conditioner) device with a left shunt APF (active power filter) configuration, termed as left shunt UPQC. This device is applied for a special load configuration. One set of load is voltage sensitive with considerable reactive power demand. The other set consist of load which is quite unaffected by voltage disturbances...
A Dynamic Voltage Restorer (DVR) model is designed for the mitigation of voltage sag and is tested for distribution system to improve Power Quality (PQ). The design is carried out with the aid of Voltage Source Inverter (VSI) in the application of DVR. The experimental results obtained are presented in this paper to analyze the performance of VSI with Sinusoidal Pulse Width Modulation (SPWM) control...
A model predictive current control (MPCC) of shunt active power filter (SAPF) requires tracking of distorted reference current based on the discrete mathematical model of the system. But the approximations considered in the development of mathematical model for the nonlinear system and also the uncertainty in the parameter values will deteriorate the performance of control algorithm. To enhance the...
The power quality (PQ) of a system expresses to which degree a practical supply system resembles the ideal supply system. Power quality is an issue that is becoming increasingly important to electricity users at all level of usage. Sensitive equipment and non-linear loads are now more common in industrial, commercial, agricultural and domestic environment. Because of this, a heightened awareness of...
This paper presents a single stage SPV (Solar Photovoltaic) system using an adaptive novel control (ANC) Scheme. The SPV system includes SPV array, VSC (Voltage Source Converter), ripple filter, nonlinear loads and three-phase distribution network. As compared to two stage systems, a single stage SPV system is developed, resulting in depletion in cost, size, weight and an improved efficiency. The...
A double switch dual-output buck-boost converter fed switched reluctance motor (SRM) drive is proposed for power factor correction (PFC) at AC mains. The motor control is achieved by regulating the DC link voltage over wide range thus obtaining the speed control. The proposed converter utilizes the two switches which turn on and off simultaneously, thus reducing the switching stress as compared to...
A novel and computationally efficient method for d-q control of solar photovoltaic (SPV) integrated UPQC (PV-UPQC) is presented in this paper. A digital filter is used to extract fundamental positive sequence (FPS) component of distorted grid voltage which is used to generate the sine and cosine values necessary in d-q based control. The shunt compensator of PV-UPQC compensates for the load side power...
Using parametric model, this paper presents a design procedure for STATCOM proportional-integral (PI) voltage controller for enhancing the voltage profile of the multimachine system under dynamic disturbances. The proposed design scheme constantly updates the PI controller thus preventing it to integrate or to saturate to a higher value under the condition of uncertainty faced by the controller arising...
Traditional 2-level voltage source inverter (VSI) based active power filters (APF) has a high DC voltage across the capacitor. A pure APF connected to a 3-ϕ 400V line voltage, will have a DC voltage of more than 600V for its effective working. Active switches in the inverter subjected to this voltage, results in a high voltage stress. Multi-level inverter topology in APF reduces the voltage stress...
This paper presents a SPV (Solar Photovoltaic)-DSTATCOM (Distribution Static Compensator) grid tied system controlled using a unity zone variable forgetting factor RLS (Recursive Least Square) algorithm along with P & O (Perturb and Observe) maximum power point tracking method. The proposed SPV grid tied system operates in two modes: Mode-1, the SPV-DSTATCOM mode which comes into operation during...
In this paper, a renewable energy based wind-PV microgrid is investigated for seamless transfer between the grid connected and isolated modes according to the grid availability. The VSC (Voltage Source Converter) based voltage and current controls are used to provide smoothness in both the operations. A battery bank is connected at the DC bus of VSC for load leveling during low power generations or...
High-current low-voltage (HCLV) rectifiers are used in the telecom industries, electroplating and induction heating system. Typical power rating of these rectifiers varies from tens of kW to hundreds of MW. In this paper, a three-phase three-level boost type PWM rectifier is proposed as an active front-end PFC scheme for telecom load. The proposed active front-end PFC converter is modeled by switching...
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