高渗透率风电波动对大规模电力系统频率动态特性的影响研究
发布时间：2018-08-02 10:55
【摘要】：可再生能源的大规模开发与利用是缓解当今世界化石能源危机,减少环境污染的重要途径。风能作为一种具有商业开发潜力的清洁能源,目前在电力系统中所占比重近年来呈现逐步增长的趋势。未来电网中传统以火电为主的同步发电机组将会被风电机组所取代,其电网将是高风电渗透率电网。由于风电机组输出功率具有随机性与波动性,当系统中风电渗透率增加时,风功率波动对于系统频率稳定性的影响不容忽视,研究高风电渗透率系统中风功率波动对系统频率的影响程度,可总结出复杂电力系统的频率响应机理。在工程中为系统风功率波动的平抑工作提供相应的数据支持,对保证未来高风电渗透率的电力系统安全稳定运行具有重要意义。风功率波动不同于传统的阶跃式功率扰动,其对于系统频率特性的影响不仅取决于功率波动的幅值,也与功率波动的频率有关,相同的功率波动幅值下,不同频率的功率波动对于系统频率特性的影响程度存在差异,当功率波动频率处于系统固有频率附近时,系统频率响应较为剧烈,本文即从系统“敏感频段”的角度,研究风功率波动对于系统频率特性的影响。本文首先通过分析在发生功率不平衡扰动下系统频率的响应机理,提出了电力系统“敏感频段”的概念,研究了在系统风电渗透率增高的背景下“敏感频段”的变化趋势。针对复杂电力系统,提出了考虑电力系统非线性特性的敏感频段识别方法,并从电力系统“敏感频段”角度,结合风功率波动的实测数据评估了风功率波动对系统频率特性的影响程度。提出了基于敏感频段的风电接纳能力预测方法。最后用实际大电网算例,验证了上述所提出方法的有效性。相比于其他电力系统频率特性受风功率波动的影响程度研究方法,本文通过分析风功率波动中敏感风功率波动分量对电力系统频率特性的影响来评估风功率波动对系统频率的影响程度,本研究工作识别了复杂电力系统敏感频段的范围,可以通过评估系统抗敏感功率扰动的能力来限制风电机组的接纳规模,并为风功率波动的平抑工作提供数据支持,维护了电力系统频率的稳定。
[Abstract]:Wind energy, as a kind of clean energy with commercial development potential, has a growing trend in the power system in recent years. In the future, the traditional thermal power generation synchronous generator will be replaced by wind turbine, and its power network will be high wind power permeability network. Because the output power of wind turbine is random and fluctuating, the influence of wind power fluctuation on the frequency stability of the system can not be ignored when the wind power permeability increases in the system. The frequency response mechanism of complex power system can be summarized by studying the influence of apoplectic power fluctuation on the frequency of high wind power permeability system. It is of great significance to ensure the safe and stable operation of the power system with high wind power permeability in the future by providing the corresponding data support for the stabilization of the wind power fluctuation of the system in the engineering. The wind power fluctuation is different from the traditional step power disturbance. Its influence on the frequency characteristics of the system depends not only on the amplitude of the power fluctuation, but also on the frequency of the power fluctuation. The influence of power fluctuation of different frequencies on the frequency characteristics of the system is different. When the power fluctuation frequency is near the natural frequency of the system, the frequency response of the system is more intense. In this paper, from the point of view of the "sensitive frequency band" of the system, The influence of wind power fluctuation on the frequency characteristics of the system is studied. In this paper, by analyzing the response mechanism of the system frequency under the disturbance of power imbalance, the concept of "sensitive frequency band" in power system is proposed, and the change trend of "sensitive frequency band" under the background of high wind power permeability is studied. For complex power system, a method of identifying sensitive frequency band considering nonlinear characteristics of power system is proposed, and from the point of view of "sensitive frequency band" of power system, The influence of wind power fluctuation on the frequency characteristics of the system is evaluated with the measured data of wind power fluctuation. A method of wind power acceptance prediction based on sensitive frequency band is proposed. Finally, the effectiveness of the proposed method is verified by a practical example of large power grid. Compared with other power system frequency characteristics, the influence of wind power fluctuation on frequency characteristics is studied. In this paper, the influence of wind power fluctuation on the frequency of power system is evaluated by analyzing the influence of the sensitive wind power fluctuation component on the frequency characteristics of power system, and the range of the sensitive frequency band of complex power system is identified. By evaluating the ability of the system to resist the sensitive power disturbance, the acceptance scale of wind turbine can be limited, and the stability of power system frequency can be maintained by providing data support for the stabilization of wind power fluctuation.
【学位授予单位】：东北电力大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM614;TM712
[Abstract]:Wind energy, as a kind of clean energy with commercial development potential, has a growing trend in the power system in recent years. In the future, the traditional thermal power generation synchronous generator will be replaced by wind turbine, and its power network will be high wind power permeability network. Because the output power of wind turbine is random and fluctuating, the influence of wind power fluctuation on the frequency stability of the system can not be ignored when the wind power permeability increases in the system. The frequency response mechanism of complex power system can be summarized by studying the influence of apoplectic power fluctuation on the frequency of high wind power permeability system. It is of great significance to ensure the safe and stable operation of the power system with high wind power permeability in the future by providing the corresponding data support for the stabilization of the wind power fluctuation of the system in the engineering. The wind power fluctuation is different from the traditional step power disturbance. Its influence on the frequency characteristics of the system depends not only on the amplitude of the power fluctuation, but also on the frequency of the power fluctuation. The influence of power fluctuation of different frequencies on the frequency characteristics of the system is different. When the power fluctuation frequency is near the natural frequency of the system, the frequency response of the system is more intense. In this paper, from the point of view of the "sensitive frequency band" of the system, The influence of wind power fluctuation on the frequency characteristics of the system is studied. In this paper, by analyzing the response mechanism of the system frequency under the disturbance of power imbalance, the concept of "sensitive frequency band" in power system is proposed, and the change trend of "sensitive frequency band" under the background of high wind power permeability is studied. For complex power system, a method of identifying sensitive frequency band considering nonlinear characteristics of power system is proposed, and from the point of view of "sensitive frequency band" of power system, The influence of wind power fluctuation on the frequency characteristics of the system is evaluated with the measured data of wind power fluctuation. A method of wind power acceptance prediction based on sensitive frequency band is proposed. Finally, the effectiveness of the proposed method is verified by a practical example of large power grid. Compared with other power system frequency characteristics, the influence of wind power fluctuation on frequency characteristics is studied. In this paper, the influence of wind power fluctuation on the frequency of power system is evaluated by analyzing the influence of the sensitive wind power fluctuation component on the frequency characteristics of power system, and the range of the sensitive frequency band of complex power system is identified. By evaluating the ability of the system to resist the sensitive power disturbance, the acceptance scale of wind turbine can be limited, and the stability of power system frequency can be maintained by providing data support for the stabilization of wind power fluctuation.
【学位授予单位】：东北电力大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM614;TM712
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