Abstract
An example is presented in this paper relating to power problems in Sandakan power network. Sandakan is a suburb in east coast of Sabah state of Malaysia. The problems were reported with power flow and N-1 contingency in terms of blackout after main grid supply outages with overload and high fault current on distribution system. This paper focuses on analysis of steady state stability of 33 kV power grid using load flow, contingency analysis and voltage stability (P-V Curve). The analysis is done by using industrial grade power software called Power System Simulation for Engineers (PSS/E). The power flow result showed that there are three generators generating out of limits. Contingency results showed that three transformer branches and three distribution branches are affected. There are nine weakest buses that violate contingency voltage deviation criterion and cannot withstand more load power when N-1-1 case in the branch of bus 8 to bus 28 is under outage.
Highlights
In Sabah grid, the power demand is increasing annually but the generated capacities is less than the power demand, especially in the east coast [1]
The problems were reported with power flow and N-1 contingency in terms of blackout after main grid supply outages with overload and high fault current on distribution system
This paper focuses on analysis of steady state stability of 33 kV power grid using load flow, contingency analysis and voltage stability (P-V Curve)
Summary
In Sabah grid, the power demand is increasing annually but the generated capacities is less than the power demand, especially in the east coast [1]. The collapse is triggered by flashover which is from conductor of 132 KV transmission line Another one is blackout in the whole east coast due to outage of 275 KV transmission line. As stated in Sabah grid Code [3], most of transmission lines, distribution and transformers fulfil N-1 contingency requirement, but studies showed that there is no N-1 contingency in aging existing transformer and existing line configuration [2]. This paper focuses on steady state stability for distribution level of power grid. 33 KV Sandakan network of Sabah Grid System is chosen to simulate steady state stability which consists of load flow simulation, contingency simulation and P-V curve. A Power System Simulation for Engineers (PSS/E) software is utilized to perform all power flow computations in this steady state analysis
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