Tracing the component unreliability contributions and recognizing the weak parts of a bulk power system

Abstract

Individual components of a complex bulk power system (BPS) have different impacts on the overall system unreliability. It would be very useful to determine the contribution of each system component to the system unreliability, and recognize the weak parts (WP) within the system. This would provide a useful tool to direct remedial measures for improving the system reliability in BPS operation and planning processes. This paper presents an unreliability tracing (UT) technique for a BPS based on two UT principles, i.e., the failure component sharing principle (FCSP) and the proportional sharing principle (PSP). The technique is illustrated by application to the RBTS and the IEEE-RTS. The case studies indicate that the developed technique can distribute the system unreliability indices to components impartially and reasonably, and can therefore be used to recognize the WP of a BPS.

Transmission congestion tracing technique and its application to recognize weak parts of bulk power systems

“…Numerous studies have been conducted on power system reliability evaluation models and indices, such as the loss of load probability, loss of load expectation, and expected energy not supplied [14][15][16][17]. At present, the tracing technique has been applied to trace power flow [18][19][20], as well as in the unreliability of general complex networks, generation systems, and BPS [21][22][23][24]. The power tracing method allows the assessment of the contributions of individual generators (or loads) to individual line flows, which often utilize sensitivity analysis.…”

“…Thus, the weak parts of a system can be recognized according to the change value [18][19][20]. For reliability tracing, the key components that cause unreliability are obtained according to reliability principles, that is, the failed component sharing principle (FCSP) and proportional sharing principle (PSP), and the reliability tracing results are the direct contribution of the weak parts to risks [21][22][23][24]. Both the sensitivity analysis and reliability tracing method can be used to recognize the key components that cause risk.…”

“…Considering the uncertainty of random failures of components, such as generating units, transmission lines, and transformers, a previous study [13] presented TC indices for the transmission components and overall system, which can be used to describe the TC degree. The present study utilizes a similar idea proposed in [21][22][23][24] to trace the TC indices suggested in [13]. Thus, this paper aims to recommend a recognition method for weak parts based on TC.…”

Risk-Oriented Renewable Energy Scenario Clustering for Power System Reliability Assessment and Tracing

“…It is necessary to quantify the contribution of each individual equipment component to the overall reliability index. At present, this topic is mainly addressed by equivalent reliability sensitivity modeling [6] [7] and reliability tracing theory [8][9] [10]. They can effectively identify the weak links of power system reliability and provide information for operators and planners in their decision-making.…”

“…The proportional sharing principle (PSP) of failed components is adopted to identify the weak links of the power system. In [10], PSP is used in parallel with failure component sharing principle (FCSP) to allocate the unreliability index to each component of the bulk power system. Reliability tracing is used to identify the weak links.…”