风火打捆外送直流闭锁故障暂态稳定性及控制措施研究

发布时间：2018-04-04 23:01

本文选题：风火打捆　切入点：交直流外送　出处：《东北电力大学》2014年硕士论文

【摘要】：大力发展新能源是我国未来能源开发的主要战略方向。随着新能源的开发建设，作为新能源领域中最成熟、最具开发规模和商业化应用前景的发电方式之一，风力发电在电源结构将占据越来越大的比重。本文基于风火打捆交直流外送典型输电模式，定位于风火打捆的送端电网，，针对直流闭锁后大容量冗余功率的转移冲击给系统带来的暂态稳定问题，研究风火交互耦合作用对电网暂态稳定性的影响，并提出强化此场景下系统安全性的优化措施。首先基于PSD-BPA电力系统仿真软件，建立了能够表征风火打捆外送系统基本特性的数学模型，并用该模型仿真分析了多种边界条件下系统的稳定性。然后采用EEAC法则与不平衡能量动力学理论，分析了风火打捆交直流外送场景下直流闭锁故障引发的暂态失稳机理。提出了表征暂态稳定程度的量化描述；分析了多种边界条件下暂态稳定性的差异；剖析了风火耦合作用影响暂态稳定性的关键因素。再次在分析典型系统基础上，针对实际电网开展了进一步研究。结合西北电网风火打捆交直流外送实际情况，重点研究哈郑直流闭锁故障下的系统稳定性，仿真分析了风电恒功率因数控制条件下风火不同比例对外送安全稳定性的影响；分析了风电场配置的动态无功补偿对暂态稳定的动态支撑作用。最后针对哈密风火打捆外送场景下特高压直流闭锁存在的失稳风险，充分发挥电网中多种安控手段的作用，研究了直流功率紧急提升、外送交流通道配置的可控高抗等FACTS的紧急控制以及切常规火电、风电机组等综合性控制措施，对控制效果进行了仿真验证。本文的研究成果为我国风火打捆大型能源基地高压交直流外送安全稳定运行提供了参考。
[Abstract]:Vigorously developing new energy is the main strategic direction of our country's energy development in the future.With the development and construction of new energy, wind power generation will occupy more and more proportion in the power supply structure as one of the most mature, most developed and commercialized power generation methods in the field of new energy.Based on the typical AC / DC transmission mode of wind and fire bundles, this paper is aimed at the transient stability of the power transmission system caused by the transfer of large capacity redundant power after DC locking.The effect of wind and fire interaction on the transient stability of power network is studied, and the optimization measures to enhance the system security in this scenario are proposed.Firstly, based on the PSD-BPA power system simulation software, a mathematical model is established to characterize the basic characteristics of the wind and fire bundles delivery system, and the stability of the system under various boundary conditions is analyzed by using the model.Then the mechanism of transient instability caused by wind and fire bundled AC / DC outputting is analyzed by using EEAC's rule and unbalanced energy dynamics theory.A quantitative description of the degree of transient stability is proposed, the differences of transient stability under various boundary conditions are analyzed, and the key factors that influence the transient stability of the wind-fire coupling are analyzed.Based on the analysis of the typical system, further research is carried out on the actual power grid.Combined with the actual situation of wind and fire bundled AC / DC outputting in Northwest Power Grid, the system stability of Ha-Zheng DC lock-in fault is studied emphatically, and the influence of different proportion of wind and fire on the safety and stability of external transmission under the condition of constant power factor control of wind power is simulated and analyzed.The dynamic supporting effect of dynamic reactive power compensation for wind farm configuration on transient stability is analyzed.Finally, aiming at the risk of instability of UHV DC latch in Hami wind and fire bundles, the paper gives full play to the role of various safety control methods in power grid, and studies the emergency enhancement of DC power.The emergency control of FACTS with controllable high reactance and integrated control measures such as cutting conventional thermal power and wind turbine with outgoing AC channel are verified by simulation.The research results in this paper provide a reference for the safe and stable operation of high voltage AC / DC outputting in large energy base of wind and fire binding in China.
【学位授予单位】：东北电力大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM614

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