大电网清洁能源与常规能源间的协调控制技术研究

发布时间：2018-06-29 14:32

本文选题：协调控制技术 + 多电源联合运行　；参考：《华北电力大学》2017年硕士论文

【摘要】：近年来,我国的清洁能源发电技术得到了快速发展。然而,电网故障或扰动引发的清洁能源大面积无序脱网问题一直未能得到妥善的解决,这可能会恶化电网电压和频率,甚至造成更严重的电网事故。本文针对上述问题,结合清洁能源和常规能源的电源特性,提出了多电源联合运行的协调控制分析流程,并从电源运行和保护两大方面对实际电网风电和火电的联合运行提出了协调控制措施,减少了故障下风电脱网的容量损失,提升了电网的安全稳定水平。本文首先结合工程背景和电源特性构建了多类型电源相互影响的目标函数,分析了约束条件,在此基础上提出了多电源联合运行的协调控制分析流程图,分为关系构建模块、电源运行条件协调控制模块和电源保护参数协调控制模块三大模块进行分析。该流程既可全面反映大电网各个电源基地之间的相互影响关系,发现电网运行过程中的潜在问题,又能有效确定合理的协调控制措施。接着提出了电源基地运行条件的协调控制措施。利用PSD-BPA软件在西北电网中仿真分析得到了河西走廊风电比例的上升会使电网安全稳定水平下降的影响规律,提出了适当增大酒泉火电出力和减小酒泉火电机端电压的协调控制措施。仿真结果表明,该措施能有效缓解简单故障下河西走廊风电基地电压骤升的现象,使风电过电压脱网容量有了明显的下降。最后提出了电源基地保护参数的协调控制措施。在简单和严重故障下分析风电高电压穿越技术对风电过电压脱网的不同影响,针对严重故障下风电高电压穿越技术可能导致风电高频脱网容量增多的问题,提出了协调控制火电汽轮机超速保护参数的想法。利用PSD-BPA软件仿真分析西北电网酒泉火电汽轮机超速保护对玉门风电高频脱网的影响过程,提出了协调控制火电汽轮机保护动作持续时间和转速设定值的措施。仿真结果表明,酒泉火电汽轮机超速保护的协调控制措施能有效避免严重故障下玉门风电脱网事故的发生,提高了电力系统风火联合运行的安全稳定性水平。本文提出的多电源联合运行的协调控制分析流程适用于大电网,既能全面而有效评估各电源基地间的相互影响关系,又能发现和解决电网运行过程中的潜在问题,实现清洁能源和常规能源的协调控制,减少了清洁能源无序脱网的容量损失,维持了电网安全稳定运行,并能在西北电网得到较好的运用。
[Abstract]:In recent years, clean energy power generation technology has developed rapidly in China. However, the problem of large-scale disorderly decoupling of clean energy caused by power grid failures or disturbances has not been properly resolved, which may worsen the voltage and frequency of the power network, and even cause more serious power network accidents. In view of the above problems, combined with the characteristics of clean energy and conventional energy, this paper proposes a coordinated control analysis flow of combined operation of multiple power sources. The coordinated control measures for the combined operation of wind power and thermal power in actual power grid are put forward from two aspects of power supply operation and protection, which can reduce the loss of wind power capacity under the fault and improve the safety and stability level of the power network. In this paper, the object function of multi-type power supply interaction is constructed based on engineering background and power supply characteristics, and the constraint conditions are analyzed. On this basis, the coordinated control analysis flow chart of multi-power joint operation is proposed, which is divided into relation building module. The power operation condition coordination control module and the power protection parameter coordination control module are analyzed. This process can not only fully reflect the interaction between the power supply bases of large power grid, but also find out the potential problems in the operation of the power network, and can effectively determine the reasonable coordinated control measures. Then the coordinated control measures of the operation conditions of the power supply base are put forward. By using PSD-BPA software in Northwest Power Grid, the influence law of increasing wind power ratio in Hexi Corridor will decrease the level of safety and stability of power network is obtained. The coordinated control measures of increasing the output power of Jiuquan thermal power and reducing the terminal voltage of Jiuquan fire motor are put forward. The simulation results show that this measure can effectively alleviate the phenomenon of sudden rise of wind power base voltage in Hexi Corridor under simple fault, and make the overvoltage de-grid capacity of wind power decrease obviously. Finally, the coordinated control measures for the protection parameters of the power supply base are put forward. This paper analyzes the different influences of wind power high-voltage traversing technology on wind power overvoltage de-grid under simple and serious faults. In view of the problem that wind power high-voltage traversing technology may lead to the increase of wind power high-frequency de-grid capacity under severe fault, The idea of coordinated control of overspeed protection parameters of thermal power turbine is put forward. By using PSD-BPA software, the influence of excessive speed protection of steam turbine of Jiuquan thermal power plant in Northwest Power Grid on the high frequency decoupling of Yumen wind power is analyzed, and the measures of coordinated control of the operation duration and speed setting value of thermal power turbine protection are put forward. The simulation results show that the coordinated control measures of steam turbine overspeed protection in Jiuquan thermal power plant can effectively avoid the occurrence of off-grid accidents in Yumen wind power plant under serious faults and improve the safety and stability level of the combined operation of wind and fire in power system. The coordinated control analysis flow proposed in this paper is suitable for large power networks. It can not only comprehensively and effectively evaluate the interaction between power supply bases, but also find and solve the potential problems in the operation of power grid. The coordinated control of clean energy and conventional energy can reduce the loss of capacity of disorderly decoupling of clean energy, maintain the safe and stable operation of power grid, and be well applied in Northwest Power Grid.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM732

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