基于动态ACE的控制区域一次调频评价方法

发布时间：2018-05-20 17:12

本文选题：区域一次调频评价 + 动态ACE　；参考：《大连理工大学》2015年硕士论文

【摘要】：一次调频是阻止频率波动的第一道防线,对于电力系统运行安全和保证运行频率质量至关重要。目前我国电网广泛采用的CPS标准,尽管可实现各类调频手段综合控制性能的评价,但不能单独、准确地评价控制区域一次调频性能。我国的一次调频为无偿服务,这就导致某些控制区域闭锁一次调频功能以获取利益,造成随着电网频率控制手段的不断提高,频率稳定性反而变差的现象。因此,亟需制定针对控制区域的一次调频性能的评价标准,以规范控制区域的一次频率控制行为,从而保障电网运行安全和频率质量。针对上述问题,本文从一次调频的动态过程出发,提出以控制区域整体的输出量评价其一次调频性能。通过对区域控制偏差(Area Control Error, ACE)的时间序列解析,得出控制区域动态ACE能够反映该区域一次调频性能。电力系统运行频率波动、区域一次调频响应情况和动态ACE等参量与扰动位置、扰动幅值、控制区域一次调频参数等因素之间的关系异常复杂,难以解析。为此,本文利用仿真对上述关系进行探究,分析表明：当在电力系统负荷大扰动位置与幅值一定,从扰动发生时刻至一次调频第一次达到出力极值的时间段内,动态ACE不受其他控制区域一次调频性能的影响,能体现该控制区域一次调频性能差异：控制区域一次调频性能与动态ACE头半波周期的加权积分值(即加权积分ACE, QACE)存在单调关系,即区域一次调频性能强,QACE越小基于上述认识,本文提出以离线建模和对比评估的方式对控制区域一次调频性能进行评价。其中,离线建模是构造待评价控制区域的标准仿真模型,模拟扰动后该区域的一次调频情况,并确定可反应不同控制区域一次调频性能与加权积分ACE关系的对比表格；对比评估是依据电网运行数据,计算得出被评价控制区域,在待评价时段内的加权积分ACE,通过对比运行数据与对比表格的差异,明确控制区域在待评价时段内一次调频性能的优劣。最后,利用数值仿真,对本文提出的评价方法进行验证,其结果表明本文提出的评价方法可行,可较为准确地评价控制区域整体一次调频性能。
[Abstract]:Primary frequency modulation is the first line of defense to prevent frequency fluctuation, which is very important for the safety of power system operation and the guarantee of frequency quality. At present, CPS standard is widely used in Chinese power network, although it can realize the comprehensive control performance evaluation of all kinds of FM means, but it can not evaluate the primary frequency modulation performance of the control area accurately and independently. The primary frequency modulation in our country serves for free, which leads to the locking of the primary frequency modulation function in some control areas to obtain the benefit, resulting in the phenomenon that the frequency stability becomes worse with the continuous improvement of the frequency control means of the power network. Therefore, it is urgent to establish the evaluation standard for the primary frequency modulation performance of the control area, in order to standardize the primary frequency control behavior in the control area, and thus ensure the safety and frequency quality of the power network operation. Based on the dynamic process of primary frequency modulation, this paper proposes to evaluate the performance of primary frequency modulation by the output of the whole control region. By analyzing the time series of the area Control Error, ACE), it is concluded that the dynamic ACE of the control region can reflect the primary frequency modulation performance of the region. The relationship between power system operating frequency fluctuation, regional primary frequency modulation response and dynamic ACE and disturbance position, disturbance amplitude and control region primary frequency modulation parameters is extremely complex and difficult to analyze. In this paper, simulation is used to explore the above relation. The analysis shows that when the position and amplitude of the large disturbance of power system load are fixed, the period from the time of occurrence of disturbance to the first time of reaching the maximum value of output force of the first frequency modulation is obtained. Dynamic ACE is not affected by the primary frequency modulation performance of other control regions. The difference of the primary frequency modulation performance of the control region can be reflected: there is a monotone relationship between the primary frequency modulation performance of the control region and the weighted integral value of the half-wave period of the dynamic ACE head (that is, the weighted integral ACE-QACE), that is, the smaller the regional primary frequency modulation performance is, the smaller the QACE is based on the above understanding. In this paper, off-line modeling and comparative evaluation are used to evaluate the primary frequency modulation performance of the control region. Among them, off-line modeling is the standard simulation model of the control region to be evaluated, which simulates the first frequency modulation of the region after disturbance, and determines the comparative table reflecting the relationship between the primary frequency modulation performance of different control regions and the weighted integral ACE. The contrast evaluation is based on the grid operation data, and calculates the weighted integral ACEs of the evaluated control area in the period of time to be evaluated, and compares the difference between the operation data and the contrast table. The primary frequency modulation performance of the control area is determined in the period to be evaluated. Finally, the numerical simulation is used to verify the evaluation method proposed in this paper. The results show that the proposed evaluation method is feasible and can accurately evaluate the overall primary frequency modulation performance of the control region.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM712

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