All interventions that enhance livelihoods of poor rural families in remote areas of the Maghreb will positively impact standard living, involve technological solutions, and likely enhance agricultural production, which in turn can further contribute to poverty reduction. Hybrid green energy systems (HGESs) have been more exploited to supply a mobile base transceiver station (BTS) by clean electricity, or assess the energy availability in smart grids (SGs) of such areas. In this paper, a HGES has been modeled to produce energy from PV/Wind HGES in grid-connected BTS or SG sites, using MATLAB to solve a theoretical model, and simulated with a suitable configuration for performance analysis and optimal sizing. A techno-economic simulation, carried out using the HOMER package, has evaluated such HGES feeding BTS or SG in a remote area-prototype (RAP) of the Maghreb, and optimized the size and assess hybrid PV-Wind system based on weather conditions for RAP. The results may impact rural livelihood and improve standard living of people in such countries.
The rising power demand has forced power systems all over the world to operate very close to their stability limits. When power systems are overloaded, faulty, or in lack of reactive power, voltage collapses would ensue. The capacity of a power system to keep the voltage of every bus constant under disturbances is called voltage stability. This dynamic phenomenon hinges on the load features. It is commonly known that flexible AC transmission systems (FACTS) can improve voltage stability. This paper puts forward a load flow model with the unified power flow controller (UPFC), and relies on the model to investigate the voltage stability of a power system through continuation power flow (CPF) method. The validity of the model was verified through a simulation, using the power system analysis toolbox (PSAT) in MATLAB/Simulink environment.
In this paper, transient stability analysis of a detailed model multi-machine power system was carried out to focus on the impact of HVDC link on system stability by comparing the critical fault clearing times of two operational scenarios, namely an AC transmission system with and without parallel HVDC transmission. The advantage and performance of AC-DC transmission for the improvement of response to transient instability caused by phase to ground fault was researched by detail simulation carried out in MATLAB/SIMULINK.
The Flexible AC Transmission System (FACTS) provides a new advanced technology solution to improve the flexibility, controllability and stability of a power system. The Unified Power Flow Controller (UPFC), as an outstanding part one for regulating power flow among the FACTS, can control respectively transmission line real power, reactive power and node voltage. This paper investigates dynamic performance of the UPFC for power flow control with a series of step changes in rapid succession under power system steady state and the response of the UPFC to a transmission line faults. Simulation was performed using MATLAB's Simulink SimPowerSystems toolbox and the results, which are carried out on a 5 bus test system and 4 bus multi-machine electric power system, shows clearly the effectiveness and viability of UPFC in rapid response and independent control of real and reactive power flow, and oscillation damping.
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