In this paper, an intelligent control strategy based on combination of the “flatness based control technique” and the “perturbation and observation (P&O) MPPT algorithm” is developed and investigated to control a hybrid electric energy source (HE More
In this paper, an intelligent control strategy based on combination of the “flatness based control technique” and the “perturbation and observation (P&O) MPPT algorithm” is developed and investigated to control a hybrid electric energy source (HEPS). This EHPS is composed of a fuel cell system (FC) and a solar panel (SP), as the main source and a supercapacitor bank (SC), as the auxiliary sources. The main property of this strategy is that the system power flow is managed in different operating modes with the same control algorithm (without algorithm commutation). The power flows between the fuel cell, the SC is controlled by the flatness based control technique while a P&O MPPT technique is developed to control power of the SP. To validate performance of the proposed control of the HEPS, the simulation results are presented.The output components follow perfectly their own references which prove favorite operation of the EHPS to reply the high dynamic load power and to help the FC in overload mode. In this strategy, the power delivered by the FC is limited and its dynamics is controlled. The simulation results confirm the validity of the proposed control strategy in the studied topology. The output voltage stays always constant even when a high step load power is imposed to the system.
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A novel method to compute the stability region in power system transient stability analysis is presented. This method is based on the set analysis. The key to this method is to construct the Hamilton-Jacobi-Isaacs (HJI) partial differential equation (PDE) of a nonlinear More
A novel method to compute the stability region in power system transient stability analysis is presented. This method is based on the set analysis. The key to this method is to construct the Hamilton-Jacobi-Isaacs (HJI) partial differential equation (PDE) of a nonlinear system, using which we can compute the backward reachable set by applying the level set methods. The backward reachable set of a stable equilibrium yields the stability region of the equilibrium point in power system transient stability assessment. The proposed method is applied to a single machine infinite bus system and a classical two-machine system yielding satisfactory results.Power system transient stability is related to the ability to maintain synchronism when subject to a severe disturbance, such as a short circuit on the bus. The resulting system response involves large excursions of generator rotor angles and is influenced by the nonlinear power-angle relationshipTransient stability assessment essentially determines whether the post-fault operating state can reach an acceptable steady-state operating point or not
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