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This paper presents analysis and control of D converter, which has continuous input and output current to obtain maximum power transfer from a photovoltaic (PV) system. Examining the maximum power involves optimization and control techniques that ensure maximum power extraction enhancement. Traditional converters have rather high input ripple current that originates considerable loss of power extraction...
A supercapacitor based static synchronous compensator, STATCOM, is proposed to control both reactive and active power exchange with the grid side. It aims to provide a comprehensive control for a distributed network, and improve the stability. However, due to its low cell voltage, long time constant, and voltage dependent energy storage, applying the supercapacitor to grid level applications is challenging...
Voltage balancing between sub-module (SM) capacitors is essential for reliable operation of the modular multilevel converter (MMC). To facilitate design and understanding of the balancing controllers, this study presents an energy transfer analysis for MMC, which explains how the energy can be independently transmitted from/to one phase, between the upper and lower arms, and among the SMs, of an MMC...
This paper proposes a unified AC chopper topology that can generate both non-inverting and inverting AC voltages. It is therefore suitable for compensating utility voltage sag-swell in domestic consumer and industry infeeds. The proposed converter is able to save on the passive device footprint and improve dynamic performance compared to other similar candidates. The topology derivation, operating...
This paper discusses the impact of fill factor on the input current ripple of the photovoltaic module and the loss effect on power extracted. Photovoltaic module's P-V curve produces exponential curve. The curvature of this curve indicates the fill factor of the particular cell; hence, by increasing the fill factor, the available extracted power increases. Yet, this paper states that losses due to...
The operation state of photovoltaic Module Integrated Converter (MIC) is subjected to change due to different source and load conditions, while state-swap is usually implemented with flow chart based sequential controller in the past research. In this paper, the signatures for different operational states are evaluated and investigated, which lead to an effective control integrated finite state machine...
Wireless power transmission technology is gaining more and more attentions in city transportation applications due to its commensurate power level and efficiency with conductive power transfer means. In this paper, an inductively coupled wireless charging system for 48V light electric vehicle is proposed. The power stages of the system is evaluated and designed, including the high frequency inverter,...
This paper presents the effect of the input current ripple on the photovoltaic source efficiency. The input and output current can be either continuous or discrete, with or without ripple, giving either continuous or discrete energy flow hence affecting the input source efficiency or the output load application. This paper considers the influences of the converter input current ripple on the photovoltaic...
Although maximum power point tracking (MPPT) is crucial in the design of a wind power generation system, the necessary control strategies should also be considered for conditions that require a power reduction, called de-loading in this paper. A coordinated control scheme for a proposed current source converter (CSC) based DC wind energy conversion system is presented in this paper. This scheme combines...
A novel algorithm is presented based on linear equation solution space theory to calculate the classic three-phase to three-phase matrix converter PWM duty cycles. It algebraically reveals an intrinsic two useful degrees of freedom in modulating the duty cycles; also discloses a general method of how to deal with distortion in the input voltage or output current whose form and harmonics quantity are...
A prototype two-stage Linear Transformer Driver (LTD) system based on power MOSFETs has been designed and tested for single shot and multi-pulse burst mode operation. Each adder stage consists of two custom designed MOSFET driver boards1 with four parallel connected MOSFETs and two high voltage MKP capacitors per board. The two boards are connected on either side of the toroid core. The custom current...
A combined supercapacitor and electrolytic capacitor energy storage system offers efficiency improvements in excess of 10% when compared to a supercapacitor-only storage system used in short-duration (<1s), high-current discharge applications. The technique is suited to distributed generation applications where low-voltage ride through and grid code compliance are important considerations. A simplified...
Renewable energy sources are being utilized as a reliable alternative to the traditional energy sources for electricity production. Among these renewable sources, wind energy has the largest and fastest penetration into power systems. This paper introduces a method for measurement of the equivalent-circuit parameters of an interior permanent magnet synchronous generator (IPMSG) used in a wind energy...
This paper proposes a stationary frame based predictive current controller for LCL coupled grid interfaced systems. Analytical expressions for the sources of error in the predictive current control, especially for low switching frequency operation, are derived. The grid voltage estimation expressions for sensorless operation are derived to enhance system reliability and performance, therein decreasing...
A conventional small-scale wind energy conversion system consists of a permanent magnet synchronous generator, a diode rectifier, a boost converter, and a grid-side inverter. Since the generator stator currents cannot be controlled independently using a diode rectifier, relatively large electromagnetic torque ripple results caused by the low frequency generator stator harmonic current. The torque...
This paper investigates the suitability of the modular multilevel converter (M2C) for medium-voltage multi-megawatt machine drives and as an interface for the integration of renewable power to the grid. Therefore, emphasis is given to issues that may affect the performance in these applications such as ac and dc side harmonics, dv/dt the interfacing transformer or machine windings may experience,...
A new proposal for a wind power system utilizes a variable-speed generator, since it has a higher energy capturing and converting efficiency than a fixed-speed system. This paper describes a vector control strategy for a direct-driven Series Connected Synchronous Generator SCSG, which is connected to the power network through a controlled three phase rectifier and a PWM inverter. The generator side...
The series connected twelve-pulse current source converter can operate under controlled p-q operation with symmetrical or asymmetrical firing of the two series connected 6-pulse converters. The input power factor and input current total harmonic distortion, THD, are dependent on the power locus which the converter operation follows. In this paper, a new p-q locus is introduced where the maximum reactive...
The paper investigates the operation of a novel sparse power converter for the switched reluctance generator for generating ac power. This will eliminate requirement of two stages of power conversion generating into power supply. The performance of the converter is investigated and simulation results are presented.
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