Transmission Line Modeling and State Space Formulation Under Capacitor Coupled Substation Power Tapping Conditions

Capacitor Coupled Substation (CCS) is one of the cost-effective unconventional Rural Electrification (URE) technologies that can be used to provide access to electricity for sparsely populated areas. CCS directly taps electrical power from high voltage (HV) electrical transmission lines and converts it to distribution level medium voltage (MV) through the use of coupling capacitors. This paper explores the impact on the transmission network when power is tapped by a CCS. The paper further develops a state-space representation of the modeled system. MATLAB/Simulink was utilized to model the system response when a CCS is connected to the network. The results showed that there was minimum interference on the upstream parameters. However, there was some impact on the parameters downstream of the tapping node. This was further supported by the results achieved when a fault condition was introduced to the CCS model. It was, therefore, concluded that interferences on the CCS would impact the overall transmission network stability downstream of the tapping node.