 Subjects -> ELECTRONICS (Total: 207 journals)
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- Optimal Location of VSC-HVDC System in Nigerian 330kV Power Network Using
a Short Circuit Voltage Violation Index and Line Loss Technique
Authors:
Felix Kalunta; Obiageli Ngwu
Pages: 1 - 10
Abstract: The capability of a power system to sustain steady and acceptable voltages at all buses after being subjected to disturbance has become a very important issue in any High Voltage Alternating Current (HVAC) transmission system, especially in developing nations like Nigeria. In weak systems, a small disturbance can cause so large deviations in the voltages that the system’s operation is jeopardized. Modern approaches favor the deployment of Voltage Source Converter High Voltage Direct Current (VSC-HVDC) systems into the weak areas of the HVAC network as suitable technologies to address this precarious situation. This paper employs a short circuit voltage violation indicator as an alternative to the Short Circuit Ratio (SCR) in locating the weak areas of the power network, with cognizance that high voltage violations occur at the weak buses. This indicator portrays the propagation of voltage dip from the fault location to the entire network by estimating the root-mean-square voltage deviations of all the buses outside the fault location. This violation index was validated by comparing its magnitude at selected locations with that of SCR. Its application on the existing 39-bus Nigerian power grid revealed that the weak areas are located in the Bauchi zone of the power grid. Every transmission line attached directly to a weak bus was subjected to power flow analysis, and considering that voltage enhancement is associated with a reduction in power loss, the line dissipating the highest loss becomes an option for the location of the HVDC system. All the HVDC options were grouped under different configurations, namely: One HVDC System, Two HVDC Systems, and Three HVDC Systems. The insertion of three HVDC systems along the Kaduna – Gombe – Jos – Makurdi transmission routes appeared as the best option since it produced the least value of voltage violation index and was consequently selected as the optimal location for the HVDC systems in the given network. The impact of the selected HVDC systems on the modified power network shows a remarkable reduction in voltage violation at the weak buses. Modifying the Nigerian electricity grid in this way will minimize voltage collapse during fault conditions, and the quality of power delivery will be significantly improved.
PubDate: 2022-11-10
DOI: 10.12691/iteces-7-1-1
Issue No: Vol. 7, No. 1 (2022)
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Open Access journal
