A compact algorithm of space vector pulsewidth modulation (SVPWM) for three-phase inverters is proposed and developed in this paper. Simplified by the method, conventional SVPWM decomposed into fast integer operations entirely using an intermediate vector, which will properly counteract redundant calculations remaining procedures. This concept can not only simplify a two-level scheme, but also suited multilevel implementation. Since it be implemented without any multiplier or divider,...

As microgrid system is still in the stage of demonstration application, has to satisfy more stringent requirements for grid connection: 1. In order ensure security grid, output power less than factory load, not sending grid. 2. The fluctuations must meet demands National Standard. improve characteristics applied industrial park requirement connection, an energy management strategy based on ultra short term prediction and feed‐forward control proposed. Through prediction, effective controlled...

In order to constantly improve the output characteristics of wind turbines, HIL (Hardware Inthe Loop) experimental platform turbines is built optimize control.According product parameters 1.5 MW direct-drive PMSG (PermanentMagnet Synchronous Generator) Dongfang Electric Corporation (DEC), thesimulation model turbine in RTDS (Real Time Digital Simulator),and optimised by comparing with speed–power curve products, engineering accuracy can be obtained. Baseon and actual controller...

A partial connection–prestressing (PCP) method is proposed in this paper to decrease the prestress that was transferred steel girders negative moment region of steel–concrete composite bridges. The connection achieved by application rubber-sleeved studs (RSS) prestressed concrete slab region. Since there no experimental research on PCP continuous girders, best authors' knowledge, two were tested under a four-point static load evaluate their mechanical performance. test results showed without...

This paper proposes a novel 3-D space vector modulation scheme for three-level three-leg neutral point clamped converter used in the three-phase four-wire active power filter towards performance optimization among load harmonic current compensation, mid-point voltage balancing, and Suppression of switching loss increase. Optimization functions different objectives are analyzed based on detailed state equations system. Furthermore, multi-objective process is presented to show how compensation...

Three-level NPC inverter has been put into practical use for years especially in high voltage power grid. This paper researches three-level active filters(APF). In this the mathematical model d-q coordinates is presented 3-phase 3-wire APFs. The dead-beat control scheme obtained by using state equations. Canceling delay of one sampling period and providing predictive value harmonic current key problem deadbeat control. Based on control, output predictor. remedied digital system command...

Due to the limitation of voltage capability and current power devices, it is very difficult handle nonlinear loads for traditional active filters(APF) with two-level inverter in high grid. Three-level NPC has been put into practical use years especially The application such converter APFs hindered by problem unbalance DC capacitors that leads system instability. This paper presents a close-loop digital control algorithm this APF. PI controller regulates outer-loop controller. In current-loop...

1Digestive Endoscopy Center, Shanghai Tenth People's Hospital, Tongji University School of Medicine, Shanghai, China; 2Department Gastroenterology, Changhai the Second Military Medical University, China. Correspondence: Feng Liu, MD. E-mail: [email protected].

In this study, four kinds of chemical substances (2,3,5,6-tetramethylpyrazine, β-ionone, citronellal, and paeonol), three plant essential oils (tea tree oil, lavender myrrh oil), their combinations were selected to explore synergistic effects on tobacco beetle [Lasioderma serricorne (Fabricius) (Coleoptera: Anobiidae)] adults by the behavioral test laboratory simulation test. Behavioral results showed that some revealed a effect adults, especially sexual attractant...

This paper main focus on the 3-D modulation scheme and neutral-point unbalance problem of 3-level 3-leg converter for active power filters. The neutral point is a key issue this topology based APFs. To date there hasn't any perfect solutions to tackle with well. In paper, detailed discussion carried out. relationship between potential relative voltages currents analyzed in paper. Then new concept named factor balance (Fn) proposed calculation formula derived. Basing Fn, novel a-b-c...

This paper describes the design and implement of digitally controlled Switching Mode Power Supply (SMPS) that can meet specifications steady-state dynamic requirements. In this architecture, primary-side DSP easily control two interleaved PFCs one phase-shift full-bridge (PSFB) PWM DC-DC converter. To realize high power density, Peak-current flux bias get rid blocking capacitor to reduce freewheeling time duty cycle loss. The modeling quantization effect analysis limit are described in...

This paper proposed a novel time-domain fault location algorithm using one-terminal data. By parameter identification method and distributed transmission line model, can be located with local voltage current Since the distance, resistance remote terminal source parameters are considered as unknown variables, time- domain equations of fault-superimposed component network solved to determine distance. The technique uses two-dimensional search in plane distance resistance. At any searching...

In this paper a deadbeat control system with novel 3-dimension (3-D) space vector modulation scheme for 3-phase 4-wire tri-level three-leg Active Power Filter (APF) is proposed. To improve the compensation effect repetitive harmonic predictor utilized to predict current and state observer used estimate output currents of APF at sampling instants in system. For direct (DC) bus neutral-point unbalancing an inherent problem. date there has not been effective method solve paper, detailed...

By defining power electronic load cell (PEL cell) and adopting different control strategies, the application of for both AC DC source is presented in this paper. A unified proposed which composed three basic PEL cells. Improved repetitive to improve dynamic performance system. Theoretical analysis simulation results verify validity load.

Endoscopic submucosal dissection (ESD) is an accepted treatment for early esophageal cancer and precancerous lesions, but resection of a large mucosal area often leads to postoperative stricture. Biomaterials provide new option the post-ESD ulcers. In this study, we developed well-defined ammonolysis-based tetra-armed poly (ethylene glycol) (Tetra-PEG) hydrogel investigated its efficacy related mechanisms preventing ESD-induced stricture in porcine model. terms material properties, Tetra-PEG...