A Risk Evaluation Based Approach to Replacement Strategy of Aged HVDC Components and Its Application at BCTC

Abstract

This paper presents a risk evaluation based approach to the replacement strategy of aged HVDC components. It includes estimation of unavailability of individual HVDC components due to aging failures, calculation of capacity state probabilities of the HVDC system, quantified risk evaluation of the power system containing the HVDC link and benefit/cost analysis for different replacement strategies. The presented approach can be also applied to other system components. The replacement strategy for an aged submarine cable of the HVDC link in a power supply system at British Columbia Transmission Corporation has been analyzed as an example to demonstrate the actual application. The procedure of the analysis has been explained in detail in the example.

Risk-based security-constrained economic dispatch in power systems

“…The risk-based approach is an emerging new direction that is studied and beginning to be used in power system planning [35,36] and maintenance [37,38]. Most of previous work focus on the Risk-based Security Assessment (RBSA).…”

Constraint relaxation and cascading contingency monitoring: A risk-based approach

“…This equivalence has been proved by two steps. First, it will be shown that (4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15) , as illustrated in Fig. 4.5.…”

“…As a developing new research direction, risk-based approach has been explored in certain research area on power system. References [3] and [4] describe the application of risk metric in obtaining power system planning schemes; references [5] and [6] implement risk-based theory in power system maintenance. It can be noted that most of the previous work are focused on riskbased security assessment (RBSA).…”

“…This fact facilitates the idea to fit the surface with a piece-wise linear surface, resulting in a linearized relationship between current and conductor temperature change, as shown in (5)(6)(7).…”

“…The overloading circuits are included in the CR set, and the dynamic heat balance equation is implemented for circuits in the CR set, which restrict conductor temperature (and not circuit flow) for the CR set, as shown in (5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20). For those circuits assigned to the NCR set, which has no observed overloads, power flow level is limited on the corresponding transmission facilities, as expressed in (5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21). (5-22)~(5-23) represent the calculation of severity value performed for the NCR circuits and CR circuits, respectively.…”