The model of deadbeat current controller for the grid-side three-phase boost pulsewidth modulation (PWM) rectifier was presented in this paper. Based on model, inherent relationship among predictive algorithms, overshoot, and phase delay obtained by analyzing three widely used algorithms different kinds reference variations. Then, a novel scheme to select prediction parameter proposed improve performance. By using fuzzy control strategy, proper chosen, which not only limits maximum but also...

Incipient faults are difficult to be detected due the intrinsic fault tolerance of traditional controller, but it should eliminated as soon possible before deteriorates with time into something more serious. As a consequence an inability assess whether occurs based on output residual, existing detection methods failure for incipient fault. So aim active (AFD) is make system unstable when has occurred, which drives rapid detection. The fault-tolerant control (FTC) designed maintain stable and...

This paper demonstrates the impact of modulation schemes on power capability a high-power converter with low pulse ratios. integrated gate-commutated thyristor (IGCT) uses five-level neutral-point-clamped H-bridge topology. It is concluded that phase-shifted carrier modulators are not attractive for such converters at ratios due to poor total harmonic distortion (THD) performance and capability. The THD key indicator optimizing IGCT converters. Therefore, low-THD patterns as level-shifted...

In this paper, the impact of dc-link voltage ripples on machine-side spectrum is investigated. The analysis targeted for a high-power converter using neutral-point-clamped (NPC) H-bridge topology. Due to high amplitude second harmonic and additional f <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> /2 subharmonic that introduced by special modulation scheme, their impacts machine are at question. work, these questions addressed via...

In this paper, a high-performance 22 MW/27 MVA test bench using pumpback topology is introduced for testing electrical machines. It proposes cost-effective concept that works reliably even with weak grid. A paralleling of two three-level integrated gate-commutated thyristor (IGCT) converters presented. I generates five-level pulse pattern low harmonic distortion at 600-Hz carrier frequency and 80-Hz load frequency. The selected magnetic device minimizes the circulating current, which ensures...

In this paper, a frequency control strategy of hybrid energy storage system (HESS) for autonomous microgrid (AMG) based on hysteretic loop is proposed. The composed two modes. Mode I coordinates the relationship between precision and battery charge/discharge cycles. II priorities supercapacitor to achieve optimal different systems. Finally, test established verify effectiveness proposed HESS. can make significant contribution stable operation MG promote utilization level renewable resources.

For high-power converters with low pulse ratios (e.g. 80 Hz load frequency 600Hz carrier for a 27 MVA Variable Frequency Drive), the current control loop design has been challenge due to large signal delay and potentially higher-order plant (LCL filter between converter machines). The stability issue cross-coupling effect is problem in such application. In this paper, complex controller excellent dynamic performance proposed. done by using "double-sided modeling" methodology. stability,...

Usually, the control method with voltage and current PI regulators in synchronous rotating frame is applied to three-phase source PWM rectifier. It easy generate inrush during startup period. A slow ramp reference commonly used achieve soft starting, but not quite effective. The paper first analyzed cause of obtained shortcomings traditional method. Then a feedforward compensation was proposed decrease current. After analysis comparison, has best performance. Finally, an experimental...

This paper presents a pumpback test bench for high-frequency high-power variable-frequency drives (VFDs) with 11 MW power rating and up to 595 Hz load frequency. A voltage combiner concept is applied allow output from the two three-level neutral-point-clamped integrated gate-commutated thyristor bridges minimum switching losses. The accordingly developed applies dc coupling combined virtual grid that can achieve capability only 1.25 facility transformer. By applying machine concept, be...

The system of remote data monitoring and recording is designed based on the core processors LM3S8962 in paper. A small HTTP SERVER built LM3S8962, it connected with terminal via Ethernet. can be recorded SD Card through SPI interface. At same time, for sake versatility, FAT file Card. So, a Ethernet-enabled ability built. This design has advantage cost-effective, easily realized, stable reliable transmission so on.

Saline soil causes problems for the construction of airfield pavements and results in some pavement failure modes that are different from or more serious than non-saline soil. Through an investigation several typical airports China, were determined this study as mainly blow-ups, faulting, slab cracking black spots. These failures attributed to subgrade course, cement-stabilising aggregate base course (CSABC) concrete surface subjected levels sulfate chloride attack. Salt-heaving experiments...

Frequency sampling is one of the usual methods in FIR digital filter design. In frequency method value transition band samples, which are usually obtained by searching for table, must be determined order to make attenuation within stopband maximal. However, table can not ensured optimal. Immune algorithm (IA) based on antigen-antibody reaction immune system biology lead global optimal solutions complex problems. this paper an application IA introduced. The detail processes realizing and...

Usually, the deadbeat control strategy is applied to three-phase voltage source PWM rectifiers. Often, uses a forward predictive algorithm of reference current compensate delay. Because uncertainty variations, single may cause large overshoot or phase delay in different changes. The paper obtained relationship among prediction parameter, overshoot, and after comparing analyzing three commonly used algorithms. Based on it, new was introduced using fuzzy method. This chose appropriate...

An improved fractional Brownian motion (fBm) model using fractal geometry is outlined motion. It produces more realistic flow trajectories than traditional does. The fBm used for producing both super diffusive and sub particle paths, therefore, the non-Fickian diffusion of clouds can be modelled. are released in an idealised coastal bay tracking method simulation cloud spreading bay. There a noticeable increase rate cloud. variation Hurst exponent lead to area being affected by contaminant...

The paper describes the technical details of design and implementation built-in boot loader for ARM uCOS, including self-adapted booting technique, using MMU, handle interrupts, indirect setting interrupt vectors, accessing large page flash, programming UART, etc. An example is provided to demonstrate real effect in uCOS porting.