Abstract:The contemporary power system is intricate in structure, it comprises of enormous number of distinct static and dynamic devices. The ever increasing demand for electrical power by consumers on the existing AC transmission power system via injection station due to urbanization poses challenges of voltage thicker, voltage instability, overloaded lines and congestion of lines thus exceeding their thermal limits which result to malfunction and eventually breakdown of transformers due to stress. In this research work, the shunt compensation method is adopted to compensate reactive power, electrical buses and fitter in conjunction with a family of flexible alternating current transmission systems (FACTS) is used to design a system to counter the challenge at the injection station, MATLAB is used to verified the functionality and effeteness of the designed on AC transmission network. Three cases were considered, during fault current, capacitive load and inductive load. The analysis demonstrates a significant improvement on the reactive power of the AC transmission network. This illustrate that the improved technique (STATCOM plus) provides an interpretation to the challenges of malfunction and breakdown of the distribution transformer at the injection station, this is to say that with the integration of the STARTCOM plus on the AC transmission power system reactive power is compensated thus increase in system capacity is achieved, allowing suppliers to have excess of power for marketing and reduction of electricity bills for consumers.
He has comparable experience and professional certifications in Health, Safety and Environment; has practiced project management including initial planning and scoping, scheduling, sourcing and procurement of materials and testing of integrated utility management systems, and is equipped with a mindset that facilitates the formulation and implementation of strategies that have significantly improved preventative maintenance and cost efficiency.
This research work has been done in a distribution network (33/11KV) which is the most essential part in electricity supply chain. The Nigeria electricity distribution companies are saddled with the responsibility of providing optimal and sustainable electricity supply to consumers while maintaining the required voltage profile at minimal power losses. They are being confronted with dearth of electricity supply to match the much needed energy demand. This research presents the application of heuristic technique to determine the optimal capacitor location and size on a distribution network for an improved voltage profile, power loss reduction and increased energy savings. Analysis and investigation were performed using Onuiyi-Nsukka distribution network as case study. The critical voltage buses on the feeder are improved with the placement of shunt capacitors with the aim of achieving a voltage profile within the statutory limit of p.u.The effects were noticed to be much in Bus ( 19) where voltage is 0.7186 p.u. which is about 24.4% deviation from the normal, bus (26) which is 0.786 p.u having 17.3% variation from the statutory limit and others. These results denote voltage deviations which causes damage to the system, and may lead to a possible system collapse if not optimized. The application of PSAT requested the use of heuristic technique with the integration of sized shunt capacitors. This reduced the network real power loss from 0.27MW to 0.12MW and the reactive power loss from 0.76Mvar to 0.13Mvar. The distribution network achieved an improved power quality. With this, electricity supply becomes reliable and sustainable for the electricity users.
This research work proposed an improved Resonant Fault Current Limiting (RFCL) protection scheme to reduce the impact of three-phase short-circuit faults in a power system sub-transmission network. The model used an interpolator-extrapolator technique based on a Resonant Fault Current Limiter (RFCL) for automating the procedure of predicting the required reactor value that must be in resonant circuit to limit the short-circuit current values to permissible values. Using the developed model, short-circuit fault simulations on the three phases of the transmission line (Phase A-C) were performed in the MATLAB-SIMULINK environment. Simulation results were obtained by varying the resonant inductance (reactor) parameter of the RFCL circuit for each of the phases to obtain permissible short-circuit current levels and the values used to program a functional interpolator-extrapolator in MATLAB; the resonant values were typically set to values of inductance equal to 0.001H, 0.01H and from 0.1H to 0.5H in steps of 0.1H. Simulation results revealed the presence of very high short-circuit current levels at low values of the resonant inductor. From the results of simulations, there are indications that the RFCL approach is indeed very vital in the reduction of the short circuit current values during the fault and can safeguard the circuit breaker mechanism in the examined power system sub-transmission system. In addition, lower fault clearing times can be obtained at higher values of inductances; however, the clearance times start to converge at inductance values of 0.1H and above.
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