储能和柔性直流输电技术在风电并网中的应用研究

发布时间：2018-07-06 08:29

  本文选题：双向功率控制器 + 混合储能　； 参考：《华北水利水电大学》2017年硕士论文

【摘要】：人类社会的发展进步建立在能源利用之上,从远古时代到现代文明也是能源的利用发展史,进入21世纪以来化石能源危机、大量使用化石能源造成的严重环境污染问题、引起全球安全局势紧张和全球气候变化等问题日益突出,这对既有的能源供给结构、能源利用模式提出了发展要求。合理开发高效的利用清洁能源是能源发展的必由之路,对新能源规模化发展对电力传输、能源供需广域平衡需求不断加深。新的能源形势促进能源技术的革命,带动了输电方式的改变。风力发电是可再生清洁能源发电中的一种具有极大开发价值的可持续发展绿色能源,而开发利用风电最有效的方式是通过规模化风电场并网运行。但是风力发电具有很多不同于其他能源发电的特点。风能不可控造成风电是一种随机性较强的不同于传统能源的电力,风电接入电网后,对电网的电压频率安全稳定运行产生不利影响。因此,研究风电并网运行技术,平抑风电功率波动以提高风电并网电能质量具有重要的现实意义和价值。本文提出了风电场通过柔性直流输电并网模型,并在直流母线并联混合储能装置,以达到平抑风电功率波动,提高风电并网交流系统母线电压频率稳定的目的。主要内容包括:1.首先对蓄电池和超级电容的拓扑模型进行了研究,并讨论了混合储能系统的主体结构,确定了混合储能系统电路结构及其连接方式,并在MATLAB仿真软件中搭建了仿真模型。该模型通过双向功率变换器控制储能系统的功率传输。通过仿真验证该并联结构满足设计要求,同时具备两种单一储能的优势。2.介绍了柔性直流输电技术的结构,根据柔性直流输电的数学模型,分析了柔性直流输电技术的原理,为了设计控制器的需要,根据坐标变换导出电压源换流器在dq坐标下的动态微分方程表达式。根据H_∞控制理论,设计了两端换流站和逆变站控制器,并搭建了仿真模型。3.结合混合储能和柔性直流输电的优点,提出和设计了风电场通过柔性直流输电并网,并在直流母线并联混合储能装置的风电并网模型,并在仿真软件中实现。仿真表明,在VSC-HVDC直流输电线路配置与风力发电机组容量相匹配的高效储能装置,通过控制器及时跟踪风电输出功率波动性补偿功率,安装在柔性直流输电系统直流母线上的储能装置能够有效削弱因风能随机波动带来的风电功率波动给并网侧交流电网母线电压、频率造成的不利影响,提高了交流系统电网的安全稳定运行的能力。因此,仿真模型关于风电场通过在直流输电线路并联混合储能装置的柔性直流输电并网模型可以满足电网对风电并网电源在电压、功率波动范围的要求,减小随机性对电网的带来的不利影响,提高并网交流母线电压和频率的稳定性提高了风电场的运行效率。
[Abstract]:The development and progress of human society is based on the utilization of energy. From ancient times to modern civilization, it is also the history of the development of energy utilization. Since the beginning of the 21st century, the crisis of fossil energy and the serious environmental pollution caused by the extensive use of fossil energy have been brought about. The problems such as global security tension and global climate change are becoming more and more prominent, which puts forward the development requirements for the existing energy supply structure and energy utilization mode. Rational development and efficient utilization of clean energy is the only way for energy development. The new energy situation promotes the revolution of energy technology and drives the change of transmission mode. Wind power generation is a kind of sustainable development green energy with great development value in renewable clean energy power generation, and the most effective way to develop and utilize wind power is to run on the grid through large-scale wind farm. But wind power generation has many different characteristics from other energy sources. Wind power is a kind of power which is different from the traditional energy because of the uncontrollable wind power. When wind power is connected to the power grid, it will have a negative impact on the safe and stable operation of the voltage frequency of the power network. Therefore, it is of great practical significance and value to study the technology of wind power grid operation and to stabilize the fluctuation of wind power in order to improve the quality of wind power. In this paper, a model of wind farm connected by flexible direct current transmission is proposed, and a hybrid energy storage device is connected in parallel with DC busbar to stabilize the fluctuation of wind power and to improve the voltage stability of the bus voltage in the wind power grid connected AC system. The main contents include: 1. Firstly, the topology model of battery and super capacitor is studied, and the main structure of hybrid energy storage system is discussed. The circuit structure and connection mode of hybrid energy storage system are determined, and the simulation model is built in MATLAB simulation software. The model controls the power transmission of the energy storage system through a two-way power converter. Simulation results show that the parallel structure meets the design requirements and has two advantages of single energy storage. The structure of flexible direct current transmission technology is introduced. According to the mathematical model of flexible direct current transmission, the principle of flexible direct current transmission technology is analyzed. According to coordinate transformation, the expression of dynamic differential equation of voltage source converter in dq coordinate is derived. According to the theory of H _ 鈭，

本文编号：2102155