“风火打捆”外送系统的网源频率电压协调研究
发布时间：2018-10-23 17:00
【摘要】：随着我国巨型风电基地的规划建设,将会有更多大规模风场接入电网,主要采取“风火打捆”的形式将风电送出消纳。“风火打捆”外送系统运行方式多变,电网的频率和电压特性影响因素多且影响关系复杂。风电功率波动下的火电机组调频控制策略,变电站SVC和可控高抗电压控制策略制定难度较大。因此研究“风火打捆”外送系统网源之间的相互协调具有重要意义。 本文分析了风电机组控制模型和火电机组控制模型的基本结构,建立了一个具有典型意义的“风火打捆”仿真分析系统,比较了超临界机组和亚临界机组控制特性差异,深入分析了固速风机在电网短路故障下发生转速失稳被过速保护切除的机理。以甘肃河西电网中一个同时包含风电和火电的外送地区为实例,分析了该地区与主网发生解列故障时火电机组一次调频特性、OPC反复动作原因及应对策略。针对风机群体性脱网故障,提出了一种紧急提升火电机组功率的系统频率控制策略,通过监测风机脱网量和火电机组有效旋转备用量,计算火电机组的紧急提升功率量,将机组CCS由正常AGC控制切换为紧急提升功率的控制,实现减小系统频率波动幅度、提高频率稳定性的效果,该策略的效果通过仿真进行了验证。分析了酒泉风电场和疆电外送一、二通道配置的FACTS装置类型和工作原理,基于风机脱网故障的仿真,研究了FACTS装置对于抑制电压波动的效果,并对酒泉风电基地配套规划的大型火电机组在加强励磁系统抑制风机脱网时电压波动效果方面提出了配置建议。
[Abstract]:With the planning and construction of the giant wind power base in China, more large-scale wind fields will be connected to the power grid, and the wind power will be sent out and absorbed mainly in the form of "wind and fire bundles". The operation mode of "wind and fire bundling" outgoing transmission system is changeable, and the frequency and voltage characteristics of power network are affected by many factors and the influence relationship is complex. It is difficult to formulate the frequency modulation control strategy of thermal power unit under the fluctuation of wind power, substation SVC and controllable high robust voltage control strategy. Therefore, it is of great significance to study the coordination between the network sources of wind and fire bundles. In this paper, the basic structure of wind turbine control model and thermal power unit control model is analyzed, a typical simulation analysis system of "wind and fire bundling" is established, and the difference of control characteristics between supercritical unit and subcritical unit is compared. In this paper, the mechanism of the speed instability of the fixed speed fan is removed by overspeed protection under the short circuit fault of the power network. Taking an outgoing area of Hexi power grid in Gansu province as an example, the primary frequency modulation characteristic of thermal power unit, the cause of repeated action of OPC and the countermeasures are analyzed when there is a break-up fault between this area and the main network. In view of the fan group breakaway fault, a system frequency control strategy is proposed to increase the power of thermal power unit urgently. By monitoring the amount of fan detachable and the effective rotating reserve of thermal power unit, the emergency lifting power of thermal power unit is calculated. The CCS of the unit is switched from normal AGC control to emergency lifting power control to reduce the frequency fluctuation amplitude of the system and to improve the frequency stability. The effect of the strategy is verified by simulation. This paper analyzes the type and working principle of the FACTS device configured by Jiuquan wind farm and Xinjiang electricity outputting, and studies the effect of the FACTS device on restraining voltage fluctuation based on the simulation of fan detachable fault. Some suggestions on how to strengthen the excitation system to restrain the voltage fluctuation when the fan is off the grid are put forward for the large thermal power units which are planned for Jiuquan wind power base.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM614
本文编号：2289902
[Abstract]:With the planning and construction of the giant wind power base in China, more large-scale wind fields will be connected to the power grid, and the wind power will be sent out and absorbed mainly in the form of "wind and fire bundles". The operation mode of "wind and fire bundling" outgoing transmission system is changeable, and the frequency and voltage characteristics of power network are affected by many factors and the influence relationship is complex. It is difficult to formulate the frequency modulation control strategy of thermal power unit under the fluctuation of wind power, substation SVC and controllable high robust voltage control strategy. Therefore, it is of great significance to study the coordination between the network sources of wind and fire bundles. In this paper, the basic structure of wind turbine control model and thermal power unit control model is analyzed, a typical simulation analysis system of "wind and fire bundling" is established, and the difference of control characteristics between supercritical unit and subcritical unit is compared. In this paper, the mechanism of the speed instability of the fixed speed fan is removed by overspeed protection under the short circuit fault of the power network. Taking an outgoing area of Hexi power grid in Gansu province as an example, the primary frequency modulation characteristic of thermal power unit, the cause of repeated action of OPC and the countermeasures are analyzed when there is a break-up fault between this area and the main network. In view of the fan group breakaway fault, a system frequency control strategy is proposed to increase the power of thermal power unit urgently. By monitoring the amount of fan detachable and the effective rotating reserve of thermal power unit, the emergency lifting power of thermal power unit is calculated. The CCS of the unit is switched from normal AGC control to emergency lifting power control to reduce the frequency fluctuation amplitude of the system and to improve the frequency stability. The effect of the strategy is verified by simulation. This paper analyzes the type and working principle of the FACTS device configured by Jiuquan wind farm and Xinjiang electricity outputting, and studies the effect of the FACTS device on restraining voltage fluctuation based on the simulation of fan detachable fault. Some suggestions on how to strengthen the excitation system to restrain the voltage fluctuation when the fan is off the grid are put forward for the large thermal power units which are planned for Jiuquan wind power base.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM614
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