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Phase locked loop inverter synchronization method is the mostly used synchronization method for both single phase and three phase systems. Recent research has focused on the improvement of the performance of the phase lock loop inverter synchronization method under different grid conditions. The common phase locked loop synchronization techniques such as the Second Order Generalized Integrator based...
The real-world performance of inverters is investigated across their full range of operation, concentrating on harmonic distortion and power factor. The inverters under review are representative of a cross-section of the UK market in terms of price and device quality. They include both voltage and current source converter topologies. The test results are compared against the relevant clauses of the...
The work suggests a space vector modulated direct torque control method to suppress the harmonic spikes. The control circuit of the presented drive utilizes a three phase five-level (5-level) inverter and an induction motor configured in open-end winding (OEW) topology. The 5-level inverter is realized using two 3-level inverters and each one is connected to two open ends of an induction motor (IM)...
With the development of computer control technology and power electronics, six-phase induction motor control system has been widely used in industrial area due to its advantages. Through the study of single-phase induction motor SVPWM control technology, combined with the six-phase induction motor winding structure, a novel six-phase induction motor SVPWM control strategy is proposed and the third...
In this paper, a single-phase Seven-Level cascaded H-Bridge (CHB) based Shunt Active Power Filter (SHAPF) based on simple controller is proposed. Synchronous Reference Frame theory (SRF) is used for reference source current extraction and to generate gating pulses for the SHAPF. The main aim of the CHB is to eliminate harmonics, improve power factor and reactive power compensation of the single-phase...
Various topologies of multilevel inverters have been proposed as a potential replacement for cascaded multilevel inverters in high-voltage, high-power applications as they can be extended to any number of voltage levels without introducing much more complexity to the control system. This paper discussed in detail about the application of selective harmonic elimination pulse-width modulation (SHE-PWM)...
For a PWM inverter system, the output ac current is expected to be a sinusoidal waveform after filtering; however, PWM inverters have two drawbacks causing distortion of output waveform. One is the presence of harmonics, and the other is the variations of the system parameters. In this paper, a robust Doubly Coprime Factorization Disturbance Observer (robust DCFDOB) is applied to a dc-to-ac inverter...
The boost inverter can be an alternative grid interfacing power converter for renewable energy sources since it can generate an AC voltage whose peak value could be greater than the DC voltage. When it connects to the grid, high quality output current is required, therefore, grid current is hoped to be controlled directly. A novel control strategy to control grid current with only one closed control...
The photovoltaic grid-connected power system filter interface circuit analysis and optimization design is the important measure to improve the system stability and grid power quality. This paper analyzes the three-phase LCL filter interface circuit model respectively on ABC coordinates and αβ coordinates. The frequency characteristic of L, LC, LCL three kinds of filter carries out comparative analysis...
This paper presents the design of a current control system for a single-phase grid-tied inverter equipped with a LCL grid-side filter, which is suitable for inverter DC current component suppression. For that purpose, a proportional-resonant (PR) controller of principal harmonic current component has been designed. This is followed by the design of DC current component estimator based on second-order...
For an inverter drive induction motor control system, a typical problem encountered is the nonlinear voltage gain caused by the non ideal characteristics of the power inverter. The switch dead time will introduce waveform distortion and fundamental voltage drop to the system. If not compensated, such distortions will introduce harmonic components which will cause additional loss in the induction machine...
An increasing number of electrical motors are driven from frequency inverters. The losses in motor are increased because the produced nonsinusoidal stator voltages, supplied from IGBTs, contain significant harmonic components. Different PWM Methods cause different voltage harmonics. Depending on the control method, the motor characteristics and the partial load, the efficiency of the motor inverter...
This paper proposes simplified space vector modulation technique for speed control of induction motor drives. The space vector modulation technique generally has several advantages such as effective bus utilization and reduction in harmonic content. Conventional Space vector modulation technique is computationally complex for on-line implementation. A simplified space vector modulation technique is...
This paper proposes a new induction motor drive scheme to generate a dense multilevel dodecagonal space vector structure, by stacking two 3-level flying capacitors and cascading two H-bridges. The proposed scheme combines the benefits of both multilevel as well as dodecagonal voltage space vector structure. All the capacitors in the stacked inverters are balanced using switching state redundancies...
In this paper a power converter topology where an Unified Power Quality Conditioner (UPQC) is combined with the photovoltaic generators is presented. This topology is based on a dual structure of the classical three-phase two level inverters. Thus, multilevel operation is achieved with the advantages of this type of inverters. Another feature of this structure is the higher reliability of the combined...
This paper presents a procedure that works at fundamental frequency to compute switching angles in single phase 9-level converters to eliminate the third and odd triple harmonics and to reduce other low order harmonics, obtaining a low total harmonic distortion (THD). The DC voltages feeding the converter, that are equal, but variable, allow to obtain switching angles independent on modulation index...
Photovoltaic (PV) energy has been widely interested today because it is clean and endless energy without causing pollution. To produce electricity from solar energy, it would be required an inverter to convert the direct current into alternating current. The inverter is the cause of problems that affect the stability of the power system because it is a switching device served to adjust the frequency...
A square wave transmission based micro-grid, which is compatible with commercial AC sinusoidal grid components, is investigated in this paper for rural areas. The basic interface circuit unit, square wave generator (SWG) is designed to satisfy bidirectional power flow and square wave transfer. The square wave has larger power delivery compared to sine wave. The circulating current of paralleled SWGs...
In high-frequency (HF) pulsating voltage injection-based sensor-less surface-mounted permanent magnet synchronous motor (SPMSM) control, inverter nonlinearities and motor parameter asymmetries lead to harmonic errors in the estimated position. To eliminate these errors, the second-order generalized integrator (SOGI) is applied. An enhanced position observer with a selective harmonic error eliminator...
The international standardization community is currently reviewing the harmonic distortion limits in the frequency range 2 to 150 kHz, referred to as supraharmonics. Power electronics has emerged as a ubiquitous technology, which also plays a critical role in this subject. Broadly speaking, the reduction of emission in the lower-frequency ranges appears to result in an increase in supraharmonic emission...
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