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Which factor must be considered by system planner for expansion of dc alternative in transmission
Cost
Technical performance
Reliability
All
All
The expansion of High-Voltage Direct Current (HVDC) transmission systems requires a multi-dimensional planning approach. System planners must simultaneously evaluate economic viability, technical performance metrics (such as stability and power flow control), and operational reliability to ensure the network meets long-term energy demand sustainably.
The expansion of High-Voltage Direct Current (HVDC) transmission systems requires a multi-dimensional planning approach. System planners must simultaneously evaluate economic viability, technical performance metrics (such as stability and power flow control), and operational reliability to ensure the network meets long-term energy demand sustainably.
CosttotalтАЛ=CinvestтАЛ+CoperationтАЛ+CmaintenanceтАЛ тАФ Represents the total life cycle cost of the DC expansion project.
R=1тИТP(failure) тАФ Represents the fundamental definition of system reliability.
HVDC expansion is a complex optimization problem where the objective function is defined by minimizing total system costs while satisfying constraints related to thermal limits, steady-state voltage stability, and fault recovery capability. Reliability is evaluated using indicators like Energy Not Served (ENS) and Loss of Load Expectation (LOLE), while technical performance is governed by converter control characteristics and line impedance factors.
HVDC systems are primarily justified for long-distance bulk power transmission or asynchronous grid interconnections.
Cost analysis includes the high initial capital expenditure (CAPEX) for converter stations vs. reduced line (OPEX) costs.
Technical performance includes harmonics control, reactive power compensation, and frequency stability support.
Reliability must account for N-1 contingency criteria to maintain supply continuity during equipment failure.
Efficient long-distance power transfer
Asynchronous interconnection capability
Independent control of active and reactive power
High cost of converter station equipment
Complex control and protection coordination
Generation of significant harmonics requiring filters
Submarine cable transmission
Interconnection of unsynchronized AC networks
Bulk power transmission over long distances
The planning process follows a sequence: load forecasting, identification of corridors, technology selection (LCC vs VSC), and cost-benefit analysis.
Option A, B, and C are subsets of the comprehensive planning matrix; therefore, Option D is the mandatory choice.
D is correct тАФ System planning for HVDC expansion necessitates a holistic evaluation of economic feasibility, technical operational capabilities, and system reliability metrics.
In EHV transmission questions involving 'system planning' or 'expansion', always look for a 'holistic' option as these systems are capital-intensive and safety-critical.