基于全系统可靠性评估方法的海上油田群电网可靠性评估

海上油田群电力系统可靠性的优劣显著影响石油生产。考虑到该类电力系统是一个包含发电、输电、变电、配电系统的独立电力系统,故障时切负荷措施也不同于陆上电力系统,因此传统可靠性评估的模型和算法不能直接使用。文中基于全系统可靠性评估理论提出一种海上油田群电力系统可靠性评估方法,并建立了全系统可靠性指标体系。在状态采样时,根据全系统可靠性评估理论将全系统分为发输电系统采样和配电系统采样,并建立综合评估方法。在发输电系统状态评估中,考虑到海上油田群电网及其负荷的特点,建立基于优先脱扣的切负荷模型。在配电系统状态评估中,考虑了级联故障的影响。最后以某油田群电力系统为实际算例,得出全系统指标并分析4类故障的影响,验证了所提方法的正确性和有效性。

Reliability Evaluation on Power System of Offshore Oilfield Group Based on System-wide Reliability Evaluation Method

The reliability of power system of offshore oilfield group has a significant impact on the oil production. Considering that this kind of power system is an independent power system including generation, transmission and distribution systems, and load shedding measures are different from those of onshore power system when a fault occurs, the traditional reliability evaluation model and algorithm cannot be applied directly. A reliability evaluation method is proposed for offshore oilfield power system based on the system-wide reliability evaluation theory, and an index system is set up for the system-wide reliability. During the state sampling, the whole power system sampling can be divided into generation and transmission system sampling and distribution system sampling according to the system-wide reliability evaluation theory, and the comprehensive evaluation method can be established. In the state evaluation of generation and transmission system, the load curtailment model based on priority trip is constructed considering the characteristics of offshore power system and its load. In the state evaluation of distribution system, the effects of cascading failure are taken into consideration. Finally, evaluation is conducted on a practical example of an offshore oilfield power system. The system-wide indices are obtained and the influences of the four kinds of failures are analyzed to prove the correctness and effectiveness of the proposed method.