Authors: Ogundare, Adaramola, Raji, Raji, Ajenikoko, Adebeshin, Onot
Abstract: Every power system comprises many generators that are connected in parallel. For the system to operate in steady-state stability, all the generators must run synchronously. If any of the connected generators loses synchronism, system stability is lost, and voltage collapse may occur. To avoid this situation, steady-state stability (SSS), which involves voltage stability and synchronisation of generators, must be monitored. This paper, therefore, focuses on the SSS using the 6-bus IEEE test network and the Nigerian 30-bus, 330 kV grid network as case studies. Power-flow analysis was carried out for the case studies. Static var compensator (SVC) and additional parallel transmission lines were used to carry out voltage improvement for each network. The use of SVC for both IEEE and Nigerian networks indicates better voltage compensation than using transmission line enhancement, but the reverse is true for power loss reduction. The power losses in the 6-bus IEEE for original and improved networks with SVC and additional transmission lines are 1.8 %, 1.6 %. and 1.2 % respectively. At the same time, those of the Nigerian 30-bus, 330 kV network are 4.3%, 3.7%, 3.10%, respectively. Synchronous Power Coefficient (SPC) was used to carry out SSS by considering load additions in steps of 20% to the original and modified networks. SSS of the modified network with SVC and the original network were approximately the same. In contrast, the SSS was improved for the networks modified with additional transmission lines. Since SSS depends on the system inertia during load variation, the inertia of the network modified with the transmission lines is improved, while SVC does not exhibit noticeable inertia properties.