考虑微网市场交易影响的配电网可靠性分析

Reliability Analysis of Distribution Network Considering Impact of Market Transaction in Microgrid

微网内分布式资源分属于不同主体,市场主体的趋利性市场行为影响微网的源荷功率特性,进而影响电力设备和配电网的可靠性。文中提出了一种考虑微网日前市场交易影响的配电网可靠性分析模型。首先,构建各类市场参与者的日前市场投标策略和市场出清模型。其次,考虑不同时段源荷水平对可靠性的影响,提出载荷相关的元件老化失效模型,并针对源、荷、投标及外部电网电价的随机性及时序性,生成'源—荷—市'联合时序场景。最后,在改进的RBTS BUS 6算例系统上进行仿真分析。结果表明,需求侧分布式资源参与市场能降低峰值时段的元件失效概率且增加系统容量备用,起到一定的削峰填谷作用,根据不同电源的出力水平合理地配置备用容量能有效提高供电可靠性。

The distributed resources in microgrids belong to different entities,and the profitable market behavior of the market entities affects the power characteristics of the generator and load in microgrids,which in turn affects the reliability of the electrical equipment and distribution network.A reliability analysis model of distribution network considering the influence of day-ahead market transactions in microgrids is proposed.Firstly,the market bidding strategy of day-ahead market for various market participants and the market clearing model is presented.Then,the unreliability of load-dependent component model is built considering the impacts of power and load level on the reliability in different time periods.Furthermore,in view of the randomness and time sequential correlation of the power,load,bidding and power price of external grid,a power-load-market joint time sequential scenario is generated.Finally,a practical case study is employed on the improved RBTS BUS 6 case system.The simulation results show that the demand-side distributed energy participating in the market can reduce the probability of component failure in peak period,raise the system reserve capacity and shift peak load.Moreover,reasonable reserve configuration according to the different output levels of generators can effectively improve the reliability of power supply.