冲击负荷对电力系统可靠性影响的分析

Influence of Shock Loads on Power System Reliability

冲击负荷对电网和电力设备带来多方面不利影响,主要从可靠性的角度对其进行研究。首先分析了来临时刻符合泊松分布、强度相互独立的冲击负荷对普通元件停运的影响。进而采用首次运行期望时间参数对常规负荷情况下的电力元件可靠性参数进行修正,并以此为基础进行冲击负荷下的电网可靠性评估。通过对冲击负荷和常规负荷2种情况下电网可靠性进行对比分析,得到冲击负荷对电网运行风险的影响。某实际地区电网算例验证了所提方法的正确性和有效性。该研究为在冲击负荷下进行系统运行风险分析和安排检修计划提供了定量的理论依据。

Shock load exerts various negative effects on electric network and power equipment. Investigations were implemented with respect to this problem focusing on power system reliability. The basic outage model of normal equipment was analyzed under the assumption that shocks arrive following a Poisson process and with mutually independent magnitudes. The parameter of the expected first-run time was used to improve the reliability index of power equipment under conventional load. The system reliability under shock load was evaluated using the improved index. The effects of shock load on system reliability can be analyzed in detail through the comparison of the results obtained with conventional and shock loads. Simulation of a regional power system demonstrates that the proposed method is effective. This research provides a quantitative reference for operation risk analysis and maintenance scheduling of power systems under shock load.