access icon openaccess Effect of wind units on market clearing price, transmission congestion and network reliability in transmission expansion planning

In this study, a transmission expansion planning problem is studied considering the effects of wind units on transmission congestion and power system reliability in a uniform electricity market. Market clearing price (MCP) is determined based on the maximisation of social welfare. Also, the congestion cost of a transmission system is defined as the difference between the cost of power supply before market clearing disregarding the transmission system (dispatching cost) and the operation cost of generating wind units of power suppliers considering transmission lines limit (re-dispatching cost). Dispatching cost is calculated using economic load dispatch and the re-dispatching cost is determined using optimal power flow. Moreover, the effect of wind units on transmission network reliability is studied through the relationship between wind units and lines loading and coherence between lines loading and lines failure rate. In addition, the effects of wind generation on composite transmission and generation reliability is formulated via the relationship between wind units and MCP and considering this price in loss of load and load shedding cost of customers. The proposed model is applied to the IEEE reliability test system and the results are discussed.

Inspec keywords: pricing; power generation reliability; load dispatching; power markets; power transmission reliability; power transmission planning; power transmission economics; load flow; load shedding

Other keywords: congestion cost; transmission system; wind units; re-dispatching cost; MCP; transmission network reliability; lines failure rate; optimal power flow; market clearing price; load shedding cost; social welfare; operation cost; IEEE reliability test system; wind generation; generation reliability; uniform electricity market; transmission congestion; transmission lines; lines loading; power system reliability; composite transmission; economic load dispatch; transmission expansion planning problem; power suppliers

Subjects: Reliability; Power system planning and layout; Power system management, operation and economics; Power transmission, distribution and supply

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