超导磁储能系统在微电网中的应用及其状态评估方法研究

发布时间：2018-01-11 16:42

  本文关键词：超导磁储能系统在微电网中的应用及其状态评估方法研究　出处：《华中科技大学》2016年博士论文　论文类型：学位论文

  更多相关文章： 微电网 超导磁储能 虚拟惯量 频率稳定性 模糊控制 超导磁体热稳定性 SMES状态评估方法 场路耦合

【摘要】：近年来,能源短缺、环境污染已经引起世界各国对节能降耗的重视。利用清洁、可再生能源的分布式发电技术为节能降耗、提高供电可靠性提供了一种新思路。微电网技术是解决清洁、可再生能源并网问题的有效手段。储能装置作为微电网的重要组成部分,对于改善微电网运行特性,提高其运行稳定性和可靠性具有重要意义。超导磁储能(Superconducting Magnetic Energy Storage, SMES)系统具有快速响应和高功率密度的特点,能够快速大幅调整其与微电网或大电网间的功率交换,可以对微电网的瞬时功率不平衡进行调节。因此,可以将SMES应用到微电网中以改善微电网的运行特性。本文在国家973计划和863计划项目的资助下,从理论分析、数学建模、特性仿真、控制策略到实验验证等方面对SMES在微电网中的应用开展研究工作,并提出了SMES状态评估方法以明确超导磁体热稳定性对SMES系统运行特性的影响。本文的主要工作和取得的成果如下：(1)针对SMES在微电网中分散化应用形式,研究基于SMES改善微电网频率稳定性的可行性和控制方法。设计了基于虚拟惯量的SMES控制策略以解决微电网惯性小的问题,提高微电网运行的频率稳定性。考虑SMES功率输出范围的限制,设计了基于模糊控制的电流调整策略,对超导磁体电流进行动态调整,保障超导磁体的热稳定性。仿真分析结果验证了所提出的控制及电流调整策略的有效性。(2)以SMES在含电动汽车充电站微电网中的应用为背景,提出一种新型基于直流母线的电动汽车充电站拓扑。通过设计SMES的功率控制策略,提高充电站直流母线电压的稳定性。在此基础上,针对电动汽车快速充电站充电功率变化率较大的问题,提出一种基于SMES控制的能量管理策略以降低电动汽车快速充电功率的变化率,降低其对微电网以及配电网的影响,提高其频率稳定性。仿真分析验证了所提出控制及能量管理策略的有效性。(3)综合考虑SMES与微电网或电力系统之间的相互作用和影响,提出并构建了SMES状态评估方法。在对SMES功率输出特性进行定量分析的基础上,研究SMES动态运行特性对超导磁体热稳定性的影响,将超导磁体电流和温度这两个主要的影响因素进行整合,得到SMES状态评估方法的具体表达式。通过对150 kJ高温超导磁储能系统进行功率调节实验、动模实验,验证了SMES状态评估方法在电力系统应用中的有效性。(4)为了进一步系统、准确地构建SMES状态评估系统,提出了基于场路耦合的SMES建模方法,对SMES状态评估方法进行延伸和拓展研究。采用所提出的场路耦合法建立了150Kj SMES超导磁体的模型,仿真分析结果与实验结果具有相同的变化趋势,能够更加真实地反映SMES的实际运行特性。此外,所提出的基于场路耦合的建模方法也可以拓展应用到其它超导电力装置。
[Abstract]:In recent years, energy shortage, environmental pollution has attracted worldwide attention. On energy saving and utilization of clean renewable energy, distributed generation technology for energy saving, provides a new way to improve the reliability of power supply. The micro grid technology is a effective means of clean, renewable energy grid problem. The energy storage device is an important part of micro the power grid, to improve the operating characteristics of the micro grid, which is of great significance in improving the operation stability and reliability. The superconducting magnetic energy storage (Superconducting Magnetic Energy Storage, SMES) system has fast response and high power density characteristics, can quickly adjust its exchange and a micro grid power system or power can be instantaneous power on the micro grid unbalanced regulation. Therefore, SMES can be applied to the micro grid to improve the operating characteristics of the micro grid. Based on the national 973 Plan And the 863 project funding, analysis, mathematical modeling, simulation of control strategy from theory to experimental verification and other aspects to carry out research work on the application of SMES in micro grid, and puts forward the evaluation method of SMES state the effect of the thermal stability of the superconducting magnet on the operation performance of SMES system. The main work and results the results are as follows: (1) for SMES in the micro grid distributed application form, feasibility study and control method of SMES to improve the frequency stability of the microgrid. Based on the design of the virtual inertia control strategy of SMES to solve the problem of microgrid based on small inertia, improve the frequency stability of microgrid operation. Considering the SMES power output range the design of the current limit adjustment strategy based on fuzzy control, dynamic adjustment of the superconducting magnet current, the thermal stability of the superconducting magnet protection. The simulation results verify the analysis The effectiveness of current control and adjustment strategies. (2) to SMES in an electric vehicle charging station micro grid application as the background, puts forward a new type of electric vehicle charging station based on DC bus topology. Through the design of SMES power control strategy, improve the stability of the DC bus voltage charging station in this paper. Aiming at the fast charging station, large power change rate of electric vehicles, a change in order to reduce the electric vehicle fast charging power rate of energy management strategy based on SMES control, reduce the impact on the micro grid and the distribution network, to improve its frequency stability. Simulation results validate the effectiveness of the proposed control and energy management strategy. (3) considering the interaction and influence between SMES and micro grid or power system, is proposed. The evaluation method of SMES state and output characteristics of SMES power On the basis of quantitative analysis, influence on the operational characteristics of dynamic SMES on the thermal stability of the superconducting magnet, the two main influencing factors of superconducting magnet current and temperature integration, specific expression evaluating method from SMES state. The 150 kJ high temperature superconducting magnetic energy storage power regulation experimental system, dynamic simulation, to verify the validity of the evaluation method of SMES in power system applications. (4) in order to accurately construct SMES system, assessment system, and puts forward the method of SMES modeling based on field circuit coupled method, the state of the SMES evaluation method and extended research. Presented 150Kj SMES superconducting magnet model using field the road is proposed, simulation results and experimental results have the same trend, the actual operating characteristics can more accurately reflect the SMES. In addition, the proposed based on field circuit coupling The modeling method can also be extended to other superconducting power devices.

【学位授予单位】：华中科技大学
【学位级别】：博士
【学位授予年份】：2016
【分类号】：TM26;TM732
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本文编号：1410383