变电站直流系统超级电容混合储能参数设计研究

发布时间：2018-07-01 19:31

本文选题：直流系统 + 超级电容　；参考：《华北电力大学》2014年硕士论文

【摘要】：变电站直流系统在电力系统中占有重要地位,为系统的安全、经济、可靠运行提供可靠保障。当今变电站的直流系统一般配置蓄电池储能装置,而冲击性负荷电流很大,在直流系统运行初始阶段对蓄电池破坏极大,严重缩短其使用寿命。若由超级电容器组负责冲击性负荷部分,则可减缓对蓄电池的冲击。因此,有必要对超级电容-蓄电池混合储能直流系统进行分析研究。论文设计了超级电容—蓄电池混合储能直流系统的电路原理图,目的在于使超级电容优先放电,缓冲冲击性负荷对蓄电池的损坏。本文首先对混合储能系统进行技术性分析和经济性分析,从技术上说明该混合储能系统是可行的,超级电容能够在单独放电时满足直流负荷运行要求。同时通过对超级电容与蓄电池容量配置方案的分析研究,说明了在经济上也能够得以优化。其次,根据直流负荷中操作机构动作时间和能量要求,提出了超级电容容量配置计算方法。依据冲击性负荷在事故末期允许的电压波动范围,对设计电路中的辅助参数电阻及感抗进行了计算。第三,针对放电过程中超级电容电压降低的问题,本文研究并利用双向DC-DC功率变换器,选择控制策略对其进行控制,达到提高超级电容输出电压,使超级电容深度放电的目的。第四,在MATLAB中对超级电容-蓄电池混合储能直流系统进行模型搭建及仿真,针对电网突然断电及突加负载两种工况仿真并分析比较结果。最后,搭建实验平台,实测结果验证了仿真结果的正确性,同时仿真结果对实验具有指导作用。
[Abstract]:Substation DC system plays an important role in the power system, which provides a reliable guarantee for the safe, economical and reliable operation of the system. Nowadays, the DC system of substation is usually equipped with storage energy device of battery, but the impact load current is very large, which destroys the battery greatly in the initial stage of operation of DC system, and shortens its service life seriously. If the supercapacitor bank is responsible for the impact load, the impact on the battery can be mitigated. Therefore, it is necessary to analyze and study the supercapacitor-battery hybrid energy storage DC system. In this paper, the circuit schematic diagram of the hybrid energy storage DC system of super capacitor-battery is designed. The purpose of this paper is to make the super capacitor discharge first and to absorb the damage of impact load to the battery. In this paper, the technical and economic analysis of the hybrid energy storage system is carried out, which proves that the hybrid energy storage system is feasible, and the supercapacitor can meet the requirements of DC load operation when discharging separately. At the same time, through the analysis and research of super capacitor and battery capacity configuration, it is proved that it can also be optimized economically. Secondly, according to the operation time and energy requirement of the operating mechanism in DC load, the calculation method of supercapacitor capacity configuration is proposed. According to the allowable voltage fluctuation range of impact load at the end of the accident, the resistance and inductance of auxiliary parameters in the design circuit are calculated. Thirdly, aiming at the problem of the reduction of supercapacitor voltage during discharge, this paper studies and uses bi-directional DC-DC power converter to control it by selecting control strategy, which can improve the output voltage of super capacitor and make the super capacitor discharge in depth. Fourthly, the supercapacitor-battery hybrid DC system is modeled and simulated in MATLAB, and the simulation results are analyzed and compared for the sudden power outage and sudden loading. Finally, the experimental platform is built, the experimental results verify the correctness of the simulation results, and the simulation results can guide the experiment.
【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】：TM63;TM53

【参考文献】