含风电的微网混合储能控制策略研究

发布时间：2018-05-18 18:39

本文选题：微网 + 风电　；参考：《重庆大学》2014年硕士论文

【摘要】：随着国民经济的不断发展，能源需求快速增长，在环境保护、能源枯竭等多重压力下，分布式能源得到了广泛关注。将分布式电源以微网的方式接入到大电网，既能减小分布式电源对配电网安全运行的影响,又能实现分布式电源的“即插即用”，最大限度发挥分布式发电技术的效益和价值。但当微网并网运行时，因风电等间歇性能源出力的随机性和负荷投切的不确定性，导致微网与主网间的交换功率大幅波动，影响主网潮流分布。将储能系统应用于微网，能够起提供短时供电、电力调峰、改善微网电能质量和提升微源性能等作用，是抑制随机性微源输出功率波动的有效方法，具有较大的经济技术优势。本文以含风电和混合储能系统的微网为研究对象，研究微网并网模式下混合储能系统的控制策略。首先，研究了风力发电系统的详细运行模型及控制方法。以小型永磁直驱风力发电系统代表间歇性微源，详细研究了采用双PWM变流电路的控制策略：电机侧变流器采用转速电流双闭环控制，，并改进了变步长爬山搜索法，获取最大风能；电网侧变流器采用电压电流双闭环控制，实现入网功率解耦控制和直流侧电压稳定。其次，研究了蓄电池-超级电容器混合储能系统的详细运行模型及控制方法。混合储能系统采用蓄电池DC/DC变换器+超级电容器DC/DC变换器+DC/AC变流器结构，提出了基于变滑动平均滤波法的混合储能系统能量管理策略，即超级电容器承担抑制微网内功率波动的高频部分，蓄电池承担微网内功率波动的平滑部分；设计了蓄电池双向DC/DC变换器的有功电流双闭环控制器，实现了蓄电池充放电控制；设计了超级电容器双向DC/DC变换器的电压电流双闭环控制器，实现了直流侧电压稳定和超级电容器充放电控制；设计了DC/AC变流器的PQ控制，使输出功率快速响应指令变化。然后，提出了基于分层控制的微网混合储能有功和无功控制策略。当微网并网运行时，抑制微网与配电网间的交换功率波动，减小对配电网潮流分布的影响。最后，基于Matlab/Simulink软件搭建了永磁直驱风力发电和混合储能系统的仿真测试模型，并对其性能进行测试。在此基础上组建了微网混合储能系统仿真实验平台，在微网并网模式下进行了仿真实验，仿真结果证明了控制策略的正确性和有效性。
[Abstract]:With the development of national economy and the rapid growth of energy demand, distributed energy has been paid more and more attention under the pressure of environmental protection and energy depletion. Connecting distributed generation to large power grid by microgrid can not only reduce the influence of distributed generation on the safe operation of distribution network, but also realize the "plug and play" of distributed generation, and give full play to the benefits and value of distributed generation technology. However, when the microgrid is connected to the grid, because of the randomness of the intermittent energy sources such as wind power and the uncertainty of load switching, the switching power between the microgrid and the main grid fluctuates greatly, which affects the power flow distribution of the main network. The application of energy storage system in microgrid can provide short-term power supply, power peak regulation, improve the power quality of micro-grid and improve the performance of micro-source. It is an effective method to restrain the fluctuation of output power of random micro-source, and has a great economic and technical advantage. In this paper, the control strategy of hybrid energy storage system with wind power and hybrid energy storage system is studied. Firstly, the detailed operation model and control method of wind power system are studied. In this paper, the control strategy of double PWM converter circuit is studied in detail with the small permanent magnet direct drive wind power generation system representative intermittent microsource. The motor side converter adopts the speed and current double closed loop control, and improves the variable step size mountain climbing search method. The maximum wind energy is obtained, and the voltage and current double closed loop control is used to realize the decoupling control of the power and the stability of the DC side voltage. Secondly, the detailed operation model and control method of battery-supercapacitor hybrid energy storage system are studied. The hybrid energy storage system adopts the DC/AC converter structure of the supercapacitor DC/DC converter of the storage battery DC/DC converter, and proposes the energy management strategy of the hybrid energy storage system based on the variable sliding average filter method. That is, the supercapacitor assumes the high frequency part of restraining the power fluctuation in the microgrid, the battery assumes the smooth part of the power fluctuation in the microgrid, and the dual closed loop controller of the active current of the battery bidirectional DC/DC converter is designed, which realizes the charge and discharge control of the battery. The voltage and current double closed loop controller of supercapacitor bi-directional DC/DC converter is designed to realize DC side voltage stability and supercapacitor charge and discharge control, and the PQ control of DC/AC converter is designed to make output power quickly respond to instruction change. Then, a hybrid active and reactive power control strategy based on hierarchical control is proposed. When the microgrid is connected to the grid, the exchange power fluctuation between the microgrid and the distribution network is restrained, and the influence on the power flow distribution of the distribution network is reduced. Finally, the simulation test model of permanent magnet direct drive wind power generation and hybrid energy storage system is built based on Matlab/Simulink software, and its performance is tested. On this basis, a simulation experiment platform for hybrid energy storage system with microgrid is set up, and the simulation experiment is carried out in grid-connected mode. The simulation results show that the control strategy is correct and effective.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM614

【参考文献】