光储混合系统孤网稳定运行控制研究

发布时间：2018-06-16 19:15

本文选题：光储混合系统 + 孤网　；参考：《中南大学》2014年硕士论文

【摘要】：摘要：在化石能源日益枯竭的今天,太阳能发电作为一种可再生的发电形式受到越来越多的重视。太阳能辐射的随机性和波动性,导致输出功率波动,会对具有高渗透率的孤立发电系统的电压和频率产生不利影响,导致了光伏发电系统输出的不可控,这成为影响光伏渗透率提高的重要因素。将光电与储能结合构成光储混合系统是解决出现问题的方式之一,尤其是在边远山区或海岛。应用储能技术被认为可以有效改善光伏发电系统的可控性。以光伏发电与锂电池系统组成的光储混合系统为研究对象,采用含线性补偿环的电压-频率控制与改进型下垂控制对混合系统孤网稳定问题进行研究。建立了光伏发电系统、锂电池系统(BESS)模型,确定光储混合系统拓扑结构。论文从储能控制策略对混合系统孤网稳定问题进行分析,BESS因其具有快速响应光电及负载动态变化的特性,故可作为类似大电网的“平衡节点”来维持系统电压和频率稳定。BESS不仅可建立电压和频率,而且可用于平滑光电与负载间的系统功率差以实现系统功率平衡,进而维持电压和频率的稳定,负荷功率分配控制采用基于电池系统荷电状态的改进型功率下垂控制策略,因采用传统下垂控制策略而导致系统达到新的稳定状态后产生的公共母线电压和频率误差,论文采用含线性补偿环的电压-频率(V/f)控制,使交流母线电压和频率更加稳定。在MATLAB/SIMULINK软件环境中建立电池系统荷电状态改进型下垂控制和含线性补偿环的V/f控制仿真模型并对其分析,验证了控制策略在稳定公共母线电压和频率稳定、负荷功率分配的正确性与有效性,表明混合系统孤网下能够稳定、可靠运行。图25幅,表4个,参考文献61篇。
[Abstract]:Absrtact: with the increasingly exhausted fossil energy, solar power generation as a renewable form of power generation has received more and more attention. The randomness and fluctuation of solar radiation lead to the fluctuation of output power, which will adversely affect the voltage and frequency of the isolated power generation system with high permeability, and lead to the uncontrollable output of photovoltaic power system. This has become an important factor affecting the increase of photovoltaic permeability. The combination of photoelectricity and energy storage is one of the ways to solve the problems, especially in remote mountain areas or islands. The application of energy storage technology is considered to be effective in improving the controllability of photovoltaic power generation systems. Based on the hybrid system of photovoltaic generation and lithium battery, the stability of the hybrid system is studied by using the voltage-frequency control with linear compensation loop and the improved droop control. The model of photovoltaic system and lithium battery system is established, and the topology of hybrid optical storage system is determined. Based on the energy storage control strategy, this paper analyzes the stability problem of hybrid system isolated network because of its characteristics of fast response to photoelectricity and dynamic change of load. Therefore, it can be used as a "balanced node" similar to large power grid to maintain system voltage and frequency stability. BESS not only can establish voltage and frequency, but also can be used to smooth the system power difference between photoelectricity and load to realize system power balance. In order to maintain the stability of voltage and frequency, the load power distribution control adopts an improved power droop control strategy based on the charging state of the battery system. Because of the common bus voltage and frequency error caused by the traditional droop control strategy, the AC bus voltage and frequency are more stable by using the voltage-frequency V / F control with linear compensation loop. In the MATLAB / Simulink software environment, the simulation models of the improved droop control and the V / F control with linear compensation loop are established and analyzed. It is verified that the control strategy is stable in the common bus voltage and frequency. The correctness and effectiveness of load power distribution show that the hybrid system can operate stably and reliably. 25 figures, 4 tables, 61 references.
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM615

【参考文献】