This paper presents a method for the optimal allocation of Distributed generation in distribution systems. In this paper, our aim would be distributed voltage profile improvement and loss reduction network. Genetic Algorithm (GA) was used as solving tool, which referring two determined aim; problem is defined objective function introduced. Considering to fitness values sensitivity genetic algorithm process, there needed apply load flow decision-making. Load combined appropriately with GA,...

In some conditions, the flux in core of current transformers (CT) increases. If this increase leads to saturation protective core, it can create a lot problems power system protection. One hardware solutions prevent occurrence CT is fixed switched resistor demagnetization method. Due disadvantages such as dependence on parameters and inefficiencies severe saturation, use method has not been expanded. This paper proposes new improve proposed method, instead using circuit topology, an...

This study presents an adaptive sliding mode type‐2 neuro‐fuzzy controller for power control of doubly fed induction generators (DFIGs). DFIG‐based wind turbine system is variable‐speed constant‐frequency energy conversion system. In this proposed scheme, in order to enhance its performance, (SMC) theory used online training the parameters fuzzy membership functions. To regulate antecedent and consequent part parameters, SMC technique according inputs. These inputs are active reactive errors...

Accurate measurement of electrical currents cannot be done when the core current transformers (CTs) is saturated. One reasons that causes saturation a CT activation auto-reclose function for circuit breaker. When breaker switched off, residual flux will remain in core, and reconnected, this may cause core. It necessary to remove an auto-reclosing scheme. In scheme, due short time interval between each reclosing shot breaker, only methods have high-speed operation should used mitigate prevent...

Here, based on wide-area measurement systems (WAMS), an adaptive tripping index (TI) is proposed for online prediction of signals with respect to out-of-step (WAOOS) protection synchronous generators. The TI included two different equations consisting a straight line unstable inter-area oscillations and sinusoidal WAOOS transient instability. For identification coherent generators oscillations, evaluating the correlation coefficients between generator behaviours, from which global (GTS) are...

This paper presents an adaptive scheme for predicting out-of-step (OOS) condition of synchronous generator based on the Bayesian technique. The proposed performs as intelligent OOS method generators from which by using training variables, tripping signals are estimated. For classifying target classes between stable and conditions, a series measurements derived under various fault scenarios including topological operational disturbances. estimated feature selection technique In this...

The loss of excitation (LOE) is one the main faults synchronous generator, which may cause serious damages to generator and makes power system unstable. problem distinguish between LOE stable swing (SPS) a time delay, part detection in all recent protection methods. This study presents new method for reduces delay by half. proposed exploits index based on variation output reactive power. It combination first‐ second‐order derivative In this method, after losses its excitation, will become...

In engineering terms, it is always desirable to maximise the efficiency of motor and look problem in economic viewpoint, minimisation weight cost required. As these two aspects are like sides a coin, usually aimed acquire best per cost. result, performance improvement permanent‐magnet synchronous (PMSM) has sides: technical economic. This study proposes new approach for design optimisation an interior PMSM (IPMSM) taking into account both performances considerations. The selected rotor...

Abstract In the power grid, various conditions may occur that saturate core of a current transformer. Saturation protection transformers can cause malfunction in relays. To prevent relays caused by transformer saturation, software and hardware methods be used. method changes relay algorithm are special devices A new is presented here, which uses compensation to occurrence saturation. proposed method, done controlling an applied voltage secondary terminals using negative resistance. The...

However, direct torque control (DTC), over years, is known to provide high dynamic performance and also fast robust response for induction motors (IM), classical DTC produces notable torque, flux ripples. In the present paper, fuzzy logic has been suggested improve system (i.e. gives faster responses reducing undesirable ripple that can occur in output torque). this controller, error, error position of stator are as inputs it a suitable voltage vector which should apply motor. paper reduce...

Series FACTS devices have been successfully used for many years in order to enhance the stability and loadability of high voltage transmission networks. The principle is compensate inductive drop line by an inserted capacitive or other words reduce effective reactance available transfer capability (ATC) network. ATC accurately reflects physical realities network, all system conditions, uses, limits a consistent manner. It depends on parameters namely total (TTC), capacity benefit margin...

This study proposes an adaptive sliding mode type‐2 neuro‐fuzzy control scheme for power‐control and speed‐control modes of doubly fed induction generator (DFIG). DFIG‐based wind turbine system operates as variable‐speed energy conversion (WECS) with constant frequency. In the proposed controller design, a (SMC) strategy is used online training parameters fuzzy set (T2FS) membership functions. Due to uncertainty speed variation in WECS, interval T2FS scheme. Based on inputs, SMC tune...

The magnetic effects and consequently the radial force are main causes of noise in switched reluctance motors (SRMs). In this study a new design for SRM is developed order to reduce acoustic noise. research investigation, at first, different structures simulated using JMAG software. An 8/6‐pole designed built with special modification rotor stator structures. For increasing mechanical strength, trapezoidal pole shape poles arc β r = s 21° proposed. taper angles equal. reduction,...

Integration of wind resources into the power systems has increased technical and financial concerns in transmission expansion planning. In this paper, a stochastic structure is demonstrated for planning with allocation fixed series compensation under load uncertainties. Fixed compensations have ability to increase transfer capacity lines. However, their significance benefit higher effectiveness dispatching, which results lower investment costs, compared without compensations. The proposed...

In conventional methods, distributing and chording the winding of a motor can be used for controlling harmonic contents magnetomotive force (MMF). This solution may not able to reduce motors desirable value that cause unsuitable performance such as crawling phenomenon. Moreover, MMF increase losses reduction in efficiency electrical motors. The effect new scheme was investigated improve induction operation by reducing MMF. By applying pattern an motor, component groups fifth (5, 11, etc.)...

Sinusoidal voltage waveform in synchronous generators is of great significance power systems. Generally speaking, the output a generator semi‐sinusoidal including some disturbance frequencies (known as harmonics) rather than fundamental frequency. The harmonic contents cause them to increase iron loss and reduction efficiency electrical machines. For this reason, should be carefully taken into consideration. In study, new winding pattern for stator proposed eliminate so makes it more...

Abstract This paper presents a multiobjective optimal design of the parameters surface‐mounted permanent magnet synchronous motors (PMSMs) considering saturation iron core. Multiobjective parameter tuning can further improve performance characteristics such motors. Specifically, efficiency and total volume are great importance in industrial applications. A new formulation is presented for these two objective functions. In this paper, optimization based on modified nondominated sorting...

In helical flux compression generators, the ohmic and intrinsic losses limit severely performance of them. One sources is turn skipping loss. This paper first introduces an accurate criterion for prevention phenomenon in these generators. Then, a novel method presented to calculate loss due this phenomenon. addition, equivalent resistance introduced consider effect on generator performance. The calculation results show that, as soon occurs, about 30% lost value increased rapidly with...

The uncertainties caused by restructuring in power systems make transmission investment less attractive for the private investors and increase risk level. In this paper, a merchant-based stochastic method is presented multi-year expansion planning from viewpoint of with allocation fixed series compensation under wind, bids generators, load uncertainties. This proposed maximizes absorption eliminates monopolies restructured environments. grey wolf optimizer algorithm point estimation are...