seyed mohammad Shariatmadar

Islamic Azad University | IAU

Combustion under highly strained conditions or at low Damköhler numbers requires external enthalpy sources to ensure stability. Such flames deviate from the conventional bimodal flame structure and chemically active fluid states become statistically relevant. The current work utilises a multi-fluid analysis in order to quantify the impact of such c...

In order to put Tehran on the road of sustainable development, it is essential to find a solution for dealing with air pollution. The use of public transport, especially metro is one of the options to achieve this goal. Since the highest share of pollutants in Tehran belongs to cars and mobile sources, relative statistical indicators are estimated...

Nonlinear and fast quasi dynamic type loads of different time-varying ranges are introduced to the electric grid systems due to renewable Energy, distributed Generation and Power electronic AC–DC–AC interface converters used in several parts of the power network, the dynamic small signal electromechanical modes are destabilized and dynamic stabilit...

Aims: Create a control policy for improve the quality of optimal voltage-frequency (VF) power supply and stability analysis in a micro-grid scenario include DG units. Study Design: Control policy for respond to sudden changes such as starting micro-grid mode, and or in load change conditions was designed. Place and Duration of Study: IAU, Iran, Feb...

Aims: The aim of this paper is optimal active-reactive power flow between main grid and micro-grid consists of two parallel Distributed Generation (DG) units. Study Design: Design of the study is applied with optimization algorithm for proposed controller power control policy. Power controller is designed to active-reactive power (P-Q) control poli...

Two-phase induction motors make an important contribution to social welfare. Accordingly, enhanced quality in such motors would benefit society. This study was done to test this type of motor to determine a nonlinear optimal point in the form of a multiobjective function between ripple of the torque and motor efficiency with consideration of a weig...

In this paper, an active auxiliary circuit is suggested to apply the minimum possible elements and having easy performance for the buck converter. By adding this circuit to the main converter, zero current transition (ZCT) is provided, and it will increase the efficiency of the converter and reduce the losses due to switching and also conduction lo...

Active Power Filters (APFs) are one of the devices which could be applied for improving the Power Quality (PQ) indices such as harmonics, unbalances and voltage flicker. The most important topics in designing APFs are their correct control and especially suitable DC capacitor control for aforesaid parameters improvement. So in this paper, a new DC...

Electrical energy is conserved at every step in the process of Generation, Transmission, Distribution and also utilization of electrical energy. It can be said that the electrical utility industry is probably the largest and most complex industry in the world and hence very complex and challenging problems to be handled by power engineering. This p...

Electrical energy is conserved at every step in the process of Generation, Transmission, Distribution and also utilization of electrical energy. It can be said that the electrical utility industry is probably the largest and most complex industry in the world and hence very complex and challenging problems to be handled by power engineering. This p...

Electrical energy is conserved at every step in the process of Generation, Transmission, Distribution and also utilization of electrical energy. It can be said that the electrical utility industry is probably the largest and most complex industry in the world and hence very complex and challenging problems to be handled by power engineering. This p...

Electrical energy is conserved at every step in the process of Generation, Transmission, Distribution and also utilization of electrical energy. It can be said that the electrical utility industry is probably the largest and most complex industry in the world and hence very complex and challenging problems to be handled by power engineering. This p...

Electrical energy is conserved at every step in the process of Generation, Transmission, Distribution and also utilization of electrical energy. It can be said that the electrical utility industry is probably the largest and most complex industry in the world and hence very complex and challenging problems to be handled by power engineering. This p...

In this paper, the role of nouns in reducing the conceptual density of contexts has been examined. A new method is proposed to identify and prune nouns with negative impact on conceptual density of contexts. In the proposed method, a fitness function is offered; a fitness degree is assigned to unambiguous nouns sense within the context. Using the m...

Under a market framework, the development of optimal offering strategies is crucial for wind power producers to achieve maximum profit. In this paper, a two-stage stochastic programming approach is proposed, considering the uncertainties on wind power production and electricity market prices. An artificial intelligence model allows generating wind-...

Under a market framework, the development of optimal offering strategies is crucial for wind power producers to achieve maximum profit. In this paper, a two-stage stochastic programming approach is proposed, considering the uncertainties on wind power production and electricity market prices. An artificial intelligence model allows generating wind-...

In this paper, an active auxiliary circuit is suggested to apply the minimum possible elements and having easy performance for the buck converter. By adding this circuit to the main converter, zero current transition (ZCT) is provided, and it will increase the efficiency of the converter and reduce the losses due to switching and also conduction lo...

In this paper, an active auxiliary circuit is suggested to apply the minimum possible elements and having easy performance for the buck converter. By adding this circuit to the main converter, zero current transition (ZCT) is provided, and it will increase the efficiency of the converter and reduce the losses due to switching and also conduction lo...

In this paper, an active auxiliary circuit is suggested to apply the minimum possible elements and having easy performance for the buck converter. By adding this circuit to the main converter, zero current transition (ZCT) is provided, and it will increase the efficiency of the converter and reduce the losses due to switching and also conduction lo...

In this paper, an active auxiliary circuit is suggested to apply the minimum possible elements and having easy performance for the buck converter. By adding this circuit to the main converter, zero current transition (ZCT) is provided, and it will increase the efficiency of the converter and reduce the losses due to switching and also conduction lo...

In this paper, new method for maximum power point tracking based on fuzzy controller has been presented that is maximum power point tracking with high power coefficient without requiring mechanical sensors and knowing system characteristics. Wind energy conversion system is simulated by using tracking system based on fuzzy controller in MATLAB/ SIM...

In this paper, first, turn-to-turn fault in a synchronous machine stator winding is investigated, and its inductances are derived with the winding function method. Then, using the nonlinear control theory, the first-order Poincaré map of the synchronous machine is computed, and a new extended Poincaré map of the machine is established. Also, the ch...

In the present paper, first a magnetization current base model is introduced for the electrical machine analyzing that saturation is occurred for the phase that its current entered to saturation region. Other part of machine may be saturated or in the linear condition in order of their currents. Then a new analytical extended Poincare's map is intr...

Reactive power control is a nonlinear and non-convex optimization problem which has a salient effect on the secure and economic operation of the power system. In this optimization problem the proper settings of bus voltages, tap settings of transformers, and reactive compensation devices. The optimization problem can be solved considering different...

Variable active passive reactance (VAPAR) is nonlinear time varying system which can generate virtual variable inductance including negative values in power circuits. AC source of VAPAR causes sinusoidal states in circuit then the circuit has not one fixed point in source period. And modified Poincare map must be used for modeling of these systems....

The permanent magnet synchronous motor (PMSM) is very useful in applications. Vector control of PMSM is popular kind of its control .But nonlinearity of PMSM and existence of inverter in its control circuit caused that optimal gains with conventional optimal control theory can not be found. In this paper first the complete vector control of PMS (in...

Variable active passive reactance (VAPAR) is nonlinear time varying system which can generate virtual variable inductance including negative values in power circuits. AC source of VAPAR causes sinusoidal states in the circuit then the circuit does not have one fixed point in source period. So modified poincare map have to be used for modeling of th...

Variable active passive reactance (VAPAR) can generate virtual variable inductance in power circuits. There are two poincare maps for studying of stability in the switching systems. One of them is first order poincare map. It is suitable for the systems with one fixed point on every switching period however; if the system has low periodic response...