输电冗余及其对现代电力市场效率的影响是输电网规划、投资与扩展必须考虑的问题。首先基于现代电力市场效率和交易成本理论构建了现代电力市场效率的综合指标,然后建立了市场效率、超额利润率与冗余度,市场效率、交易成本与冗余度的关系模型,并通过算例就输电冗余对电力市场效率的影响进行详细分析,最后得出结论:合理的输电冗余不会降低电力市场效率;输电网实现投资最优可促进电力市场效率提高。 Transmission redundancy and its impact on the efficiency of modern electricity markets are issues that must be considered in transmission network planning, investment and expansion. First of all, based on the theory of modern electricity market efficiency and transaction cost, this paper constructs the comprehensive index of modern electricity market efficiency, and establishes the relationship model of market efficiency, excess profit rate and redundancy, market efficiency, transaction cost and redundancy, A case study on the influence of transmission redundancy on power market efficiency is made. Finally, the conclusion is drawn that reasonable transmission redundancy will not reduce the efficiency of power market; and that the optimal investment in transmission network can promote the efficiency of power market.