An output line-to-line voltage model-based fault diagnostic technique is presented in this paper. From the theoretical analysis of under normal and faulty conditions, a preprocessing method developed to extract features from diagnosis eigenvalue. A envelope line generated by proposed function. By comparing preprocessed eigenvalue envelope, single-switch open-circuit faults can be located precisely. Because does not rely on accurate amplitude voltage, influence load changing minimized simple...

An optimal coordinated voltage controller (OCVC) is developed based on the spirit of model predictive control (MPC) method. The OCVC consists three components, namely a predictor, candidate pool, and selector. It has been used in secondary (SVC) to coordinate dissimilar actions at different geographical locations order maintain desired profiles global sense emergencies. A single-stage Euler state predictor (SESP) utilized, system model, predict performance under selected actions; selection...

Neutral-point (NP) voltage imbalance is an inherent problem of three-level neutral-point clamped (NPC) converter. To solve this problem, improved virtual space vector pulse width modulation (VSVPWM) proposed in paper. A new repartitioning the sectors for NPC converter by considering amplitude variations small vectors under NP imbalance. The factor <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">k</i> introduced. favorable to balance selected...

With the increase of photovoltaic penetration, power-electronic converter (PEC)-interfaced generators with traditional control strategy may cause severe power oscillations after being disturbed due to lack inertia and damping. The plant controlled by virtual synchronous generator (VSG) technology, while introducing damping improve stability system, will also inherit its oscillation characteristics a new mode. Aiming at this problem, paper analyzes difference between system low-frequency...

A methodology called the sensitivity tree, which can be easily used to form an expert system for real-time control, is proposed. Based on this methodology, control of voltage and reactive power a developed. The main objective help operator detect buses experiencing abnormal conditions, select most effective measures, calculate actions required overcome violation. measures alleviate problem are capacitor compensation, transformer tap changes, generator terminal changes. By keeping bus in...

In this article, a fast and robust diagnostic method for multiple open-circuit (OC) faults is presented voltage-source inverters. Only two line voltages are used as diagnosis variables, which economic, simple, can reduce the influence caused by failure rate of information sources. Possible magnitudes these voltage vectors characterized in detail both healthy faulty operations. Then, several features extracted diagnosis. Single-switch double-switch be accurately quickly located through...

There is a problem of magnetic leakage in the charging process wireless power transfer systems, which can threaten human safety and affect normal operation electronic equipment. In this paper, system adopts bilateral LCCS hybrid topology to address problem. It proposes field shielding suppression method based on improved electric eel foraging optimization algorithm. Firstly, Fuch infinite folding chaos strategy Cauchy–Gauss variation are introduced optimize algorithm, further improves global...

Abstract Helix Stiffened Cement Mixing Pile (HSCMP) is a rigid composite pile type that combines screw piles and flexible cement‐soil to form complementary reinforcements. Aiming at the horizontal bearing performance of HSCMP, numerical analysis model was established, parametric carried out study ratio unconfined compressive strength undrained shear soil around ( q u /s ), blade diameter D/d ) Effects on load‐displacement curve, displacement, bending moment HSCMP. The results show...

Location of the static VAR compensator (SVC) and other types shunt compensation devices is important for enhancement voltage stability practical power systems. With theory normal forms diffeomorphism, this paper proposes a new method to solve problem. The proposed makes use nonlinear participation factors, in which nonlinearity systems can be taken into consideration. As result, most suitable location where SVC should used system determined, even cases characterized with strong nonlinearity....

The parameter mismatch caused by the uncertainties and unknown disturbances degrades performance of finite-control-set model predictive control (FCS-MPC). This paper presents a model-free fault-tolerant (MFFTPC) method based on an extended sliding mode observer (ESMO) for surface-mounted permanent magnet synchronous motor (SPMSM) drive system. First, considering disturbances, novel ultra-local (ULM) is established PMSM Next, current controller (FCS-MFFTPCC) designed in loop, deadbeat speed...

Flexible Alternating Current Transmission Systems, called FACTS, got in the recent years a well-known term for higher controllability power systems by means of electronic devices. FACTS-devices can effectively control load flow distribution, improve usage existing system installations increasing transmission capability, compensate reactive power, quality, and stabilities network. However, location these devices plays significant role to achieve such benefits. This paper presents application...

As the technique of orthogonal frequency-division multiplexing (OFDM) has ability to overcome effect multipath and obtain high spectral efficiency communication channel, it is generally considered as one most effective methods realize high-speed digital system over low-voltage powerline. This paper proposes a novel OFDM method, in which cosine carriers conventional are replaced with orthonormal wavelets. A quantitative index used measure interference, including intersymbol interference (ISI)...

Flexible alternating current transmission systems (FACTS) devices are multi-functional control which can be used to effectively the load flow distribution and power transfer capability, reduce active losses, improve stabilities of network, decrease cost production fulfill other requirements by controlling in network. However what extent performance FACTS brought out highly depends upon location parameters devices. In this paper, two techniques, a genetic algorithm (GA) technique particle...

Open-circuit (OC) fault diagnosis of voltage source inverters on trains still has two problems to be improved. First, it is usually forbidden change the system structures or add any extra sensor. Therefore, diagnostic methods which need pulse width modulation control signals output sensors are no longer suitable for trains. Second, loads train vary in a wide range and have significant influence currents. In order solve these increase maintenance efficiency, an online method single switch OC...

Abstract The inverter is an indispensable part of a power electronics system. Its safety and stability are important indicators for evaluating the reliability Inverter faults usually caused by operating in switch elements. This paper therefore proposes non-intrusive fault-diagnosis method open-circuit semiconductor switches. requires only current signal. It simple economical. Faults can be diagnosed quickly using proposed algorithm. First, phase waveforms before after fault analysed based on...

The safety and reliability of inverters play a significant role in stable power electronic system operations. Considering railway vehicle air-conditioning inverter as case study, this paper presents generic open-circuit fault diagnosis method that can be applied to various control schemes. First, detailed model three-phase output currents under both normal status is derived, then the concept space trajectory introduced based on currents. faults lead phase current distortion. Therefore,...

To achieve precise prediction of the air pressure changes in critical components brake system, including pipes (BP), auxiliary reservoirs (AR), and cylinders (BC), this paper proposed a neural network-based model developed from application release experimental data with different applications (50, 70, 100, 150 kPa) conducted on heavy haul train (HHT) test platform. The physical structures system working mechanisms network are introduced, scheme is presented by analysing variation within...

Abstract Unified power flow controller (UPFC) is one of the most effective flexible AC transmission systems (FACTS) devices for enhancing system security. However, to what extent performance UPFC can be brought out, it highly depends upon location and parameters setting this device in system. This paper presents an approach based on evolutionary algorithms (EAs) techniques find out optimal placement settings security under single line contingencies (N‐1 contingency). Firstly, we perform a...

A novel fault diagnosis method and a tolerant scheme for open-circuit faults on traction rectifier are proposed in this paper. When an occurs any leg of the rectifier, indication will be generated accurately to identify faulty without utilization extra sensors. Furthermore, can reconfigured maintain its full output rate prevent breakdown. The process is neither related control trigger signal nor load fluctuation. involved parameters input voltage which most common control. Working under zero...