微电网储能单元与APF组合装置原理及控制方法研究

发布时间：2018-06-09 01:15

本文选题：微电网 + 储能单元　；参考：《湖南工业大学》2014年硕士论文

【摘要】：微电网作为大型电网的有力补充，在电力系统中扮演着越来越重要的角色。但由于众多非线性电力电子成员的加入，使微电网的电能质量受到严重污染。在不增加成本的前提下，为解决微电网电能质量问题，研究适用于微电网的储能单元与APF组合装置，实现“一机多能”。本文着重针对微电网储能单元与APF组合装置的原理及控制方法展开研究。深入研究改善电网系统电能质量的微电网储能单元及APF的系统结构及工作原理，对比分析两者存在的诸多相似点，提出微电网储能单元与APF组合装置，进一步提出二者组合系统的结构设计方案。分析装置谐波抑制、无功补偿及UPS功能原理及装置的工作模式，该装置能在实现储能单元并网调节微电网功率的同时，还可以发挥电能质量调节的功能。对组合装置的控制方法进行研究。建立DC-DC变换器数学模型，在传统控制基础上加入功率限制环节，确保储能单元的稳定运行。建立DC-AC变换器数学模型，研究该变换器在并网模式和UPS模式两种不同工作模式下的控制策略，提出并网模式下基于复合校正技术的改进三角波比较控制方法，实现对DC-AC变换器的有效控制。研究组合装置的电流指令合成方法及输出电流限制方式。提出含前馈校正的直流母线电压预测控制方法，实现对组合装置直流母线电压的有效控制。设计组合装置的总控制器，，对锁相环进行设计，实现装置的精确锁相。在对系统控制方法研究的基础上，设计基于DSP+FPGA系统的软件设计流程图。为验证本文提出的组合装置及控制方法的可行性及其运行效果，进行了详细的仿真和实验研究。结果表明，本装置不仅能够实现储能单元并网调节微电网功率的功能，还可以发挥电能质量调节的功能，为解决微电网电能质量问题提供了一个新颖且成本较低的方法。
[Abstract]:As a powerful supplement of large power grid, microgrid plays a more and more important role in power system. However, the power quality of microgrid is seriously polluted by the addition of many nonlinear power electronic members. In order to solve the power quality problem of microgrid without increasing the cost, a combination of energy storage unit and APF for microgrid is studied to realize "one machine multi-power". In this paper, the principle and control method of microgrid energy storage unit combined with APF are studied, and the system structure and working principle of APF and micro-grid energy storage unit, which can improve the power quality of power system, are studied in detail. By comparing and analyzing the similarities between the two systems, an energy storage unit and an APF combination device are proposed, and the structural design scheme of the two combined systems is put forward. The harmonic suppression, reactive power compensation, UPS function principle and the working mode of the device are analyzed. The device can realize the power regulation of the microgrid while the energy storage unit is connected to the grid. The function of power quality regulation can also be brought into play. The control method of the combined device is studied. The mathematical model of DC-DC converter is established and the power limiting link is added on the basis of traditional control to ensure the stable operation of the energy storage unit. The mathematical model of DC-AC converter is established, and the control strategy of the converter in grid-connected mode and UPS mode is studied. An improved triangular wave comparison control method based on composite correction technique is proposed in grid-connected mode. The effective control of DC-AC converter is realized. The current command synthesis method and output current limiting mode of the combined device are studied. A predictive control method for DC bus voltage with feedforward correction is proposed to realize the effective control of DC bus voltage of the combined device. The main controller of the combined device is designed and the phase locked loop is designed to realize the precise phase lock of the device. Based on the research of system control method, the software design flow chart based on DSP FPGA system is designed. In order to verify the feasibility and operation effect of the combined device and control method proposed in this paper, the detailed simulation and experimental research are carried out. The results show that this device can not only realize the function of energy storage unit connected to grid to adjust the power of microgrid, but also can play the function of power quality regulation. It provides a novel and low cost method for solving the problem of power quality of microgrid.
【学位授予单位】：湖南工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM73

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