考虑大规模可再生能源的动态潮流计算方法

发布时间：2018-03-10 17:21

本文选题：动态潮流　切入点：频率响应　出处：《山东大学》2017年硕士论文　论文类型：学位论文

【摘要】：动态潮流计算(DPF)作为调度员培训仿真系统(DTS)一个重要功能模块,研究的是系统存在功率扰动,频率非额定工况下的潮流解算问题。它将系统不平衡功率按照一定规律分配给具有调频能力的发电机组和负荷,而非原本意义上的平衡节点,因而更加符合电力系统运行实际状况。世界范围内可再生能源装机容量快速上升,并网渗透率不断增加。因此,在传统动态潮流计算中考虑各类可再生能源模型的已经十分必要。首先,在简要介绍主流可再生能源发电单元运行特点基础上,本文给出了以风机和光伏为代表的可再生能源等效机组的调频特性。对于转速与系统频率耦合的鼠笼异步风机,通过数学推导得到其功频特性;对于正常情况下工作于MPPT模式的双馈风机和光伏阵列,给出结合减载控制和下垂控制的复合控制策略使其稳定参与系统一次调频,并仿照发电机调频特性给出其频率调节系数表达式和整定环节表达式。基于此,提出一种考虑可再生能源等效机组的基于特定频率响应模型的动态潮流计算方法(R-DPF)。本文提出的计算方法采用常规潮流计算和频率响应计算交替进行的形式,即在系统初始条件确定情况下,发生功率扰动后先进行频率计算,一段时间后更新发电机,可再生能源和负荷出力数据,再进行常规潮流计算,如此往复。其中常规潮流计算采用牛拉法和PQ分解法联合迭代的架构,将可再生能源根据其控制特点视为不同的节点类型参与迭代;频率计算基于特定的响应计算模型,并将可再生能源调频特性计入其中,可以反映大规模可再生能源并网后的频率动态特性。软件方面,利用Fortran语言编写所述的动态潮流计算程序。最后,在IEEE-30节点系统不同节点接入可再生能源模拟不同渗透率,并利用改进系统验证发生负荷扰动后的所述方法和程序的有效性。
[Abstract]:Dynamic power flow calculation (DPF) as a dispatcher training simulation system (DTS) is an important functional module, is the study of power system disturbance frequency, non rated condition of the power flow calculation. It will not balance the power system according to certain rules assigned with FM generator and load capacity, rather than the original balance of nodes meaning, which accords with the actual situation of power system operation. The worldwide installed capacity of renewable energy increased rapidly, grid permeability increasing. Therefore, the traditional dynamic power flow calculation considering all kinds of renewable energy model is very necessary. Firstly, after a brief introduction of the mainstream renewable energy power generation unit operating on the basis of the characteristic in this paper given the frequency of renewable energy equivalent to the wind turbine and photovoltaic units represented. For squirrel cage asynchronous machine wind speed and frequency of the coupled system, The power frequency characteristics through mathematical derivation; for the normal case in MPPT mode of doubly fed wind turbine and photovoltaic array, are combined with the reduced composite control strategy for load control and droop control to make it stable in a frequency control system, and gives the frequency characteristics of FM generator after the adjustment coefficient expression and setting part of the expression. Based on this, this paper presented a renewable energy equivalent unit method to calculate the dynamic trend of specific frequency response model (R-DPF). Based on this calculation method using the conventional power flow calculation and frequency response calculation of alternating form is determined in the initial condition of the system under the condition of power disturbance occurred after the first frequency calculation, update generator after a period of time, renewable energy and power load data, then the conventional power flow calculation, and so forth. The conventional power flow calculation using Newton method And the PQ decomposition method combined with iterative architecture, renewable energy will be considered according to the control characteristics of different types of nodes in the iterative calculation; frequency response based on specific model, and renewable energy frequency included, can reflect the large-scale renewable energy network and the frequency dynamic characteristics. In the software, the dynamic trend of the use of Fortran language write the calculation program. Finally, in the IEEE-30 node system of different node access to renewable energy and the use of simulation of different permeability, can effectively improve the system verification of the method and procedure of the load disturbance.

【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM744

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