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In this paper a modification to dual comparison one cycle control is proposed which enables bi-directional power flow in single phase grid connected converters. Advantages of dual comparison one cycle control when compared to conventional one cycle control is that it does not give any steady state dc offset, no light load instability and unipolar pwm without having to sense the grid voltage. Modification...
This work deals with the development of a new ‘intelligent monkey king evolution (IMKE) algorithm’ for maximum power peak (MPP) detection under partially shaded solar photovoltaic (SPV) conditions. The major advantages of the developed technique are simple in implementation, population free, extremely less memory requirement, zero algorithms constant dependence, fast convergence and perfect structure...
In a power system network, the system power needs are met by all the generating stations working in coordination. When there are many power generating units, a lot many operating strategies are possible to meet the time based varying power demand. In this paper, an optimization study is carried out to checkout the cost effectiveness of using a deloaded photovoltaic (PV) instead of battery. The three...
The brushless DC (BLDC) motor can be controlled either by fixed dc link voltage control with Pulse Width Modulation (PWM) or by variable dc link voltage control with Pulse Amplitude Modulation (PAM). But neither of these can be a proper method for BLDC motor. Since the PWM control induces high current and torque ripple at high speeds and PAM control limits its application at low speeds due to the...
To improve the harmonic reduction ability in input line current of 12-pulse diode bridge rectifier (DBR) using zigzag autoconnected transformer with a dc side current injection technique is presented in this paper. Conventional 12-pulse rectifier does not meet the IEEE-519 standard and therefore current injection technique at dc side is used to shape the system current waveform to minimize the harmonic...
Applications that demand stringent conditions on output dc voltage ripple require models that can accurately predict the magnitude of ripple at the output voltage. The paper analyses the impact of dc input ripple on the output ripple for Series Resonant Converter (SRC) using discrete domain sampled data modelling method. The paper presents a novel discrete state space and small signal model for SRC...
In recent times, along with the growth of the solar energy extractions, the grid connected solar inverters are gaining more popularity. The huge deployment of solar inverters may reduce the power quality of utility grid, if they deployed without proper power quality measures. As per the IEEE 1547 standards, the current total harmonic distortion (THD) should not be more that 3 % at the point of common...
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...
This paper presents three different virtual space vector based strategies to keep the neutral point potential fluctuation (NPPF) low in the field weakening region for an interior permanent magnet synchronous machine (IPMSM) drive. Out of three strategies, one even completely eliminates the NPPF. A detailed analytical study to demonstrate the root cause behind the high NPP fluctuation in the field...
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 discusses the different aspects of the interconnected operation of DC microgrid. Each source in a microgrid uses a proportional controller to eliminate the limitations of droop control. Effect of interconnecting line inductance and resistance on system stability is investigated using root locus plot. The sensitivity of different modes to the states of the system is analyzed using participation...
A dual two-level inverter with an open-end winding induction motor can realise a three/four level voltage space vector. High switching frequency coupled with the use of such multilevel inversion system can produce good motor drive performance. This however can generate immense machine shaft voltage and bearing currents apart from large leakage ground currents that are deleterious to the motor drive...
In this paper, a comparative study of different harmonic elimination techniques has been adopted to mitigate the undesired dominant lower order harmonics from the output voltage of cascaded multilevel inverter. It has been shown that particle swarm optimization technique gives better result as compared to the mathematical theory of resultant and newton raphson method. Theoretical results are verified...
The paper proposes a simple and novel technique for driving a silicon carbide power MOSFET using silicon power MOSFET driver IC and single unipolar supply voltage. In the proposed technique, a unipolar supply voltage is given to the driver IC and split by an RC divider network for obtaining an intermediate reference point which is connected to the source terminal of the SiC MOSFET. The gate terminal...
Modelling and simulation of emerging DC shipboard power system (SPS) is required to validate the hardware design, converter control and protection algorithms. As DC SPSs may be large and complicated, the simulation of such systems using high fidelity models generally consumes much time and the validation of performance using multiple test scenarios becomes impractical. An alternative method is to...
Accurate knowledge of magnetic field distribution of a machine is essential aspect for its design. Magnetic flux density is useful for estimation of machine performance such as induced voltage, cogging force/torque, force/torque, and flux weakening capability of the machine. Moreover, it is also helpful for performance prediction and optimization. In this paper analytically no load magnetic fields...
Technological advancements has made production of electrical energy more efficient and minimized the consumption of non-renewable sources of energy. Wind energy has been harvested for more than a decade and has been considered to be one of the cleaner methods of producing electricity. This paper focuses on wind electric system connected to the grid. There are different types of wind electric generators...
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...
The Parallel Hybrid Excitation Machine (PHEM) has advantage of good flux regulation as compared to the Series Hybrid Excitation Machine (SHEM). While the series hybrid excitation machine has a simple rotor structure, the parallel hybrid excitation machines proposed so far in the literature have either complex structures or large in size to overcome the drawbacks of series hybrid excitation machine...
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