储能逆变器及其抑制光伏功率波动的研究
发布时间：2018-11-12 14:25
【摘要】：随着世界化石能源的枯竭,以及世界环境污染的逐渐恶化,具有环保和可再生等特点的新能源发电技术有了非常好的应用前景。然而由于某些新能源的随机性和不稳定性,对电力系统的安全、可靠、高效运行造成了很大的压力。为了平滑新能源的输出功率,提高新能源发电的可靠性,降低新能源发电的波动性,与储能系统配合发电成为重要的发展方向。 首先,本文分析了储能蓄电池的各种等效电路,并对现有典型等效电路进行改进,提出了一种基于简单等效电路和三阶动态等效电路相结合的新的等效模型,并在PSCAD/EMTDC仿真平台进行了验证。 其次,对比了不同充放电方式(恒压、恒流、恒功率)的特点,采用双环控制策略在PSCAD/EMTDC平台进行数值仿真,总结分析不同充放电模式下储能系统输出的电压电流特性。然后研究了不同充放电模式之间的切换方法,提出了一种带软化控制环节的改进控制策略,用于改善平滑切换电流过渡曲线。根据蓄电池的特性条件,提出了三变量控制法进行充放电终止控制。 再次,对比分析了不同光-储联合系统的拓扑结构的特点。本文采用交流侧并联拓扑结构,针对储能系统对光伏功率的平波抑制进行了深入的研究,提出了一种新的计算平抑波动补偿功率的算法。在PSCAD/EMDTC仿真平台中,进行了仿真验证。 最后,对储能逆变器样机试验中发生的一些故障进行了总结分析。
[Abstract]:With the depletion of fossil energy in the world and the deterioration of environmental pollution in the world, the new energy generation technology with the characteristics of environmental protection and renewable has a very good application prospect. However, due to the randomness and instability of some new energy sources, there is great pressure on the safe, reliable and efficient operation of power system. In order to smooth the output power of new energy, improve the reliability of new energy generation and reduce the volatility of new energy generation, it is an important development direction to cooperate with energy storage system to generate electricity. Firstly, this paper analyzes the various equivalent circuits of energy storage battery, improves the existing typical equivalent circuits, and proposes a new equivalent model based on the combination of simple equivalent circuit and third-order dynamic equivalent circuit. It is verified on the PSCAD/EMTDC simulation platform. Secondly, the characteristics of different charging and discharging modes (constant voltage, constant current, constant power) are compared, and the characteristics of voltage and current output of energy storage system under different charging and discharging modes are summarized and analyzed by using double loop control strategy to carry out numerical simulation on PSCAD/EMTDC platform. Then, the switching method between different charge-discharge modes is studied, and an improved control strategy with softening control is proposed to improve the smooth switching current transition curve. According to the characteristic condition of battery, a three-variable control method is proposed for charge and discharge termination control. Thirdly, the characteristics of topology of different optical storage systems are compared and analyzed. In this paper, the parallel topology of AC side is used to study the plane-wave suppression of photovoltaic power in the energy storage system, and a new algorithm is proposed to calculate the compensation power. In the PSCAD/EMDTC simulation platform, the simulation verification is carried out. Finally, some faults occurred in the prototype test of energy storage inverter are summarized and analyzed.
【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】：TM464
本文编号：2327371
[Abstract]:With the depletion of fossil energy in the world and the deterioration of environmental pollution in the world, the new energy generation technology with the characteristics of environmental protection and renewable has a very good application prospect. However, due to the randomness and instability of some new energy sources, there is great pressure on the safe, reliable and efficient operation of power system. In order to smooth the output power of new energy, improve the reliability of new energy generation and reduce the volatility of new energy generation, it is an important development direction to cooperate with energy storage system to generate electricity. Firstly, this paper analyzes the various equivalent circuits of energy storage battery, improves the existing typical equivalent circuits, and proposes a new equivalent model based on the combination of simple equivalent circuit and third-order dynamic equivalent circuit. It is verified on the PSCAD/EMTDC simulation platform. Secondly, the characteristics of different charging and discharging modes (constant voltage, constant current, constant power) are compared, and the characteristics of voltage and current output of energy storage system under different charging and discharging modes are summarized and analyzed by using double loop control strategy to carry out numerical simulation on PSCAD/EMTDC platform. Then, the switching method between different charge-discharge modes is studied, and an improved control strategy with softening control is proposed to improve the smooth switching current transition curve. According to the characteristic condition of battery, a three-variable control method is proposed for charge and discharge termination control. Thirdly, the characteristics of topology of different optical storage systems are compared and analyzed. In this paper, the parallel topology of AC side is used to study the plane-wave suppression of photovoltaic power in the energy storage system, and a new algorithm is proposed to calculate the compensation power. In the PSCAD/EMDTC simulation platform, the simulation verification is carried out. Finally, some faults occurred in the prototype test of energy storage inverter are summarized and analyzed.
【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】：TM464
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