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Excitation system plays a key role in realistic simulation and analysis of the dynamic performance of electrical power systems to a large extent. Therefore, it is desire to obtain the real parameter of the excitation system in order to study the dynamic performance of power systems. This paper presents a practical technique to address the excitation system identification. The measurement was performed...
Herein, the concept of an ancillary service manager is developed for the provision of additional control reserve capacity. The aggregating entity clusters time-varying, aggregated battery capacity from plug-in hybrid electric vehicle (PHEV) fleets and power reserves from conventional generators. It is shown that providing additional control reserve capacity from time-varying sources such as PHEVs...
A security scheme of the power systems should protect the integrity of the electric networks and carry out fast operations on the entire power system to prevent a possible blackout. Blackouts started as local failures led to electrical disturbances, and the complete collapse of the power systems. This work proposes a security scheme based in two stages. In the first stage, the controlled separation...
This paper discusses a novel approach for damping interarea oscillations in a bulk power network using multiple unified power flow controllers (UPFCs) utilizing ultracapacitors, also known more generally as electrochemical capacitors (ECs). In this paper, a new control is introduced to mitigate interarea oscillations by directly controlling the UPFCs' sending and receiving bus voltages that better...
This paper presents the application of bio-inspired artificial bee colony (ABC) optimization to constrained economic load dispatch problem. Independent simulations were performed over various systems with different number of generating units having constraints like prohibited operating zones and ramp rate limits. The performance is also compared with other existing similar approaches. The proposed...
Renewable energy sources are becoming more and more important for power systems. With increasing sizes and a mandate to operate as financial entities seeking to maximize benefits in an electricity market, power systems require highly effective planning tools. In this paper, an optimal capacitor planning method based on optimal power flow is proposed for a power system with wind generators and PV arrays...
For every state utility in India, along with state owned generation there are two major sources of power available to fulfill the load demand. They are, Central Govt owned generation i.e. central sector generation and power purchased from power trading market. For optimum scheduling, additional sources of power need to be incorporated in the generation scheduling algorithm, along with their individual...
We propose and implemented a novel structure and fabrication method of a micro energy harvesting device based on vibration-driven power generation that matches the surrounding oscillation frequency. When the micro energy harvesting device vibrates at its own resonant frequency, its output maximizes. However, a micro device usually has a high resonant frequency, because of the size. We succeeded in...
With increasingly proportion of distributed generation (DG) in the power system, traditional power system planning has new challenges and demands. The necessity for flexible electric system, changing regulatory, energy savings and environmental impact are providing impetus to the development of DG. Itpsilas critical that the power system impacts be assessed accurately so that DG can be applied in...
Real time test is a necessary step for the control device of equipment before it is installed in power system. In this paper, a closed-loop test platform which is based on real time digital simulator (RTDS) is established to test the performance of FACTS device controller. In this paper, static Var compensator (SVC) which is installed in a power plant is used for damping sub synchronous oscillation...
Because of indeterminacy problem with selecting energy function of generator Hamiltonian model, a modeling method is proposed to derive Hamiltonian model from fundamental energy relation of generator. Under single machine infinite-bus system and ignoring D-Q damping winding, in response to mechanical and electric analytical dynamics, this paper establishes Lagrange functions, dissipation functions...
Formulating the power system equations with respect to the systempsilas inertial center, it is shown that a large disturbance tends to pull each generator from the rest of the generators, forming a multi-machine equivalent. Clustering generators is a useful general technique in data mining of large-scale power grid data sets. This paper presents a new kernel-based clustering algorithm for multi-machine...
This paper presents an output power control methodology for wind turbine generator which can decrease frequency deviation of power system using load power estimation. Load power is estimated by a disturbance observer, then output power command for wind turbine generator is determined according to estimated load power. Additionally, the wind turbine generator can also be controlled well during wind...
On the base of studying on existing wind farm models in power flow calculation, two improved power flow algorithms for power system including wind farm which may be composed of squirrel cage induction generators (SCIG) or doubly-fed induction generators (DFIG) are presented in this paper. Since reactive power of wind farm is rectified synchronously in every power flow iterative process, the improved...
A new kind of excitation control scheme in which the fuzzy control and neural network technique is integrated to the design of the generator nonlinear control is proposed. Based on the theory of the synchronous generator excitation control system, one machine-infinity power system nonlinear mathematical model expressed by state equation is established. A fuzzy RBF (Radial Basis Function) neural network...
A method for identification of a synchronous generator is suggested in this paper. The method uses the theoretical relations of machine parameters and the new wavelet network structure combining a polynomial model with multi-resolution half-complex wavelet decomposition to find the state space model of the system. The proposed structure takes the advantage of both polynomial models and wavelet networks...
This paper presents a two-phase genetic algorithm for economic load dispatching of generators in power systems. The problem of ELD is expressed as a Lagrange function. The conventional GA has a drawback that the algorithm is not so effective as the number of variables increases. To improve the GA characteristic, a two-phase GA is proposed to obtain better solutions. The proposed genetic algorithm...
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