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Harmonics is one of the important parameter which plays havoc in the successful operation of any equipment. Hence, this parameter has to be concentrated much. In this context, a Harmonic Elimination System (HES) using a novel type of PWM scheme is developed in the simulation environment. Design of harmonic suppression system is done. Simulations are performed & the results are obtained. The results...
The characteristic to shield harmonics of the novel converter transformers is presented in this paper. Then design the DC transmission system of the novel transformer to achieve harmonics shielding function, by adopting the novel transformer on the rectifier side. Based on the calculation method of harmonic content in the HVDC system, calculate and allocate the reactive power compensation on both...
Overmodulation area of five-phase converters is covered by space vector PWM methods above all. The paper proposes a carrier-based PWM modulator employing the minimum infinity-norm method which is able to synthesize an arbitrary voltage vector in both, αβ and xy planes, respectively, which is advantageous besides the linear modulation area in the overmodulation zone as well. Thanks to the proposed...
Resonant converters represent a suitable family of topologies that can handle the loose inductive coupling encountered in applications for contactless energy transfer while still providing high efficient operation. However, the analysis of resonant converters is in general cumbersome. On circuit level, a design procedure based on the extended first harmonic approximation of the multi-resonant LLCC...
The integration of photovoltaic sources to conventional grid and increased utilization of nonlinear loads yield major power quality issues in the distribution system. Such power quality issues are commonly reduced by photovoltaic fed distributed static compensator (PV-DSTATCOM). In this paper, a comparative analysis of the PV-DSTATCOM performance for different controllers is shown. The controllers...
This paper presents high-power-density inverter with pulse current injection power decoupling method. In order to reduce the dc-link capacitor significantly, dc-link current is fully analyzed with double Fourier method in theory. Compared with the traditional 2nd harmonic power decoupling method, the pulse current injection method considers not only 2nd order harmonic but also the higher order harmonics...
This paper focuses on the dynamic analysis of a novel piezo-based accelerometer with asymmetric gapped cantilever array. The accelerometer with asymmetric gapped cantilever, firstly published in Xu's work, exhibits significantly improved sensitivity. In this paper, in order to achieve wider dynamic response range, new structure of the accelerometer is proposed with asymmetric gapped cantilever array.
A study of current efficiency for CMOS class-B and class-C LC oscillators working in triode region is presented in this paper. Using Fourier-transform analysis and rigorous mathematical deduction, closed form expressions describing current efficiency are derived for class-B and class-C LC oscillators. Simulation results have been run in Cadence SpectreRF using 0.13-um standard RF CMOS technology,...
We present a new method for spatial soundfield recording based on the application of compressed sensing theory. The major problem in spatial soundfield recording system is how to record the higher order harmonic components of a given soundfield using as few as possible of microphones. The proposed method is under the assumption that the soundfield is sparse in source domain. More specifically, based...
A comparative analysis of Boost and Buck-Boost Converter for power factor correction (PFC) with diode bridge rectifier is discussed in this paper. Boost and Buck-Boost PFC converter faces very high THD and poor PF in open loop control. Thus Hysteresis Band Current controller is used to reduce the Total harmonic distortion (THD) of input current waveform and improve power factor. PFC is attained here...
Reduction of the spatial harmonics of back electromotive force(EMF) is a useful way to reduce thrust ripple of permanent magnet linear synchronous motor (PMLSM). In this study, a method of v-skewing in the coils is proposed to reduce the harmonics to suppress thrust ripple in the PMLSM. The thrust and the harmonic are generated in a double-sided PMLSM model. The 3-D finite element method (FEM) is...
This paper presented Proportional Resonant (PR) current control of single phase grid connected inverter for PV energy conversion to the utility grid. The synchronization mechanism is Second-Order Generalized Integrator (SOGI) phase locked loop (PLL). The PR current control is regulator in stationary reference frame and an advantage is reduce current distortion. The implemented software using Real...
In power systems, the intensive use of nonlinear loads causes several power quality problems such as current harmonic pollution. In order to reduce the current harmonic pollution, the shunt hybrid active filter (SHAPF) is the best solutions effectively. In shunt hybrid active filter systems SHAPFs, the design of dc link controller is a significant and challenging task due to its impact on the performance...
This paper aims to provide control strategies for distributed micro-storage energy systems at the residential level to contribute to smart grid goals. The operation of local Energy Storage Systems (ESS) at homes in a Smart Community with distributed generation based of renewable energies is analyzed by simulation. Each individual home receive the active and reactive power set-points from the Smart...
Electric vehicles (EV) can be used as distributed energy storage devices to provide to the smart grid different regulation services. However, to have enough impact in the grid, the trend is to jointly manage a set of EV by means of a new stakeholder called aggregator. Knowing the availability, mobility habits, and the state of charge (SOC) of each EV battery, the aggregator performs the allocation...
In recent years, the three-phase pulse width modulation controlled voltage source converter (PWM-VSC) has found its way to wide range of applications, among which renewable energy sources and adjustable speed drives are the most common. In order to achieve low harmonic distortion of current at the point of common coupling (PCC), LCL filters are used for grid connection since they ensure higher damping...
A fast single-phase voltage sag detection method under distorted grid voltages is presented in this paper. The synchronously rotating reference frame (SRRF) is applied to the proposed single-phase voltage sag detection to gain fast and proper operation. In the park transformation, the set of 2 AC voltages are needed to generate the DC voltages that are varied with the grid voltages. These 2 AC voltages...
Power definition is established and accepted in electrical literature for quite some time, but non-active power definitions are another story. In this paper we will use two power definitions with improved averaging algorithm for calculating active and reactive power of an arc furnace plant. Both of these definitions are easy to implement in practical applications. Since rated frequency of the plant...
A novel BWO based on a planar helix slow-wave structure with straight-edge connections is presented. Simulation results show that the operating frequency of the BWO varies from 15.5–20 GHz when the beam voltage is tuned from 4.5 KV to 9KV. A cylindrical annular electron beam is applied to improve the interaction between the beam and the em field.
The paper deals with behavior of Czech traction power supply system of AC 25 kV. The main goal of this paper is analysis of transient effects during operation of traction vehicles in various modes which can arise during short-circuits in traction system. The protection settings have to be done for all possible states in traction system including identification of short-circuits in the case of recuperation...
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