Security value based expansion planning of power system with integration of large-scale wind power

Abstract

Concerning the integration of large-scale wind power, an integrated model of generation and transmission expansion planning is proposed based on the assessment of the value of steady state and dynamic security. In the assessment of security value, the unit commitment simulation based on the predicted hourly load and wind power output data in the planning horizon is used to evaluate the costs of preventive control, emergency control and social losses due to the uncertainty of load and wind power. The cost of preventive control consists of the fuel cost of power generation, the environmental cost and the load shedding cost. This not only provides a systematic method of security assessment of power system expansion planning schemes, but also broadens the perspective of power system planning from the technology and economic assessment to the measure of the whole social value. In the assessment process, the preventive control and emergency control of cascading failures are also presented, which provides a convincing tool for cascading failure analysis of planning schemes and makes the security assessment more comprehensive and reasonable. The proposed model and method have been demonstrated by the assessment of two power system planning schemes on the New England 10-genarator 39-bus System. The importance of considering the value of security and simulating hourly system operation for the planning horizon, in expansion planning of power system with integration of large-scale wind power, has been confirmed.