确保电力可靠供应的发电设备检修空间评估

Assessment of Generators’ Maintenance Space Ensuring Power Supply Reliability

以确保新型电力系统建设过程中的电力可靠供应为约束,提出一种综合测算方法,用以量化评估电网对发电设备检修的承载能力和承载水平。首先,提出以有效供电能力衡量新型电力系统下的电力保供能力,给出有效供电能力的定义、工程测算方法并以实例验证其有效性;其次,基于有效供电能力,首次提出以发电检修空间、发电检修裕度评估测算电网对发电设备检修的承载能力、承载水平,给出其工程计算方法并开展实例分析;最后,基于发电检修空间、发电检修裕度分析新型电力系统下的最小有效供电能力增量需求。结果表明,随着新能源渗透率的增加,近年来发电检修裕度总体呈下降态势,检修安排更加困难;要在新型电力系统建设过程中确保电力可靠供应和完成发电设备检修任务,需根据负荷增长科学配建常规电源。

To ensure the power supply reliability at the process of the new-type power system’s establishment, a method of the quantitatively evaluation is proposed to characterize the endurance and degrees of the power system’s generation maintenance. Firstly, “effective generation” is proposed to describe the generation’s contribution in the reliable power supply by giving its definition, its engineering measurement and its effectiveness proved with real events.Secondly, based on the effective generation, the “generation maintenance space” and the “generation maintenance margin”are proposed to estimate the generators’ maintenance limits and degrees to the power system operation, which are illustrated at real power-system operation. Lastly, based on the generation maintenance space and the generation maintenance margin, a method to calculate the minimum incremental demand of the regular power generation capacity is deduced and illustrated with real power system operation. The result shows that with the penetration of new energy generation the real generation maintenance space is decreasing step by step, which makes the generators’ maintenance arrangements more difficult. Besides,to ensure both the power supply reliability and the generators’ maintenance fulfillment, the increase of the reasonable effective generation is necessary.