交流三端口变换器及其控制研究
发布时间：2018-09-18 14:30
【摘要】：传统电力系统设备因其不具备灵活功率流控制、无法实现能量多节点双向传输、难以提供多样化供电形式的特点,难以满足未来智能电网发展需求。基于电力电子技术发展而来的固态变压器等各类电力电子变换装置,不但能为各类可再生能源及储能系统提供丰富互联接口,还将为未来电网潮流智能分配管理和多端能量变换提供灵活控制方法。本文研究了一种应用于未来智能电网的交流三端口变换器,完成以下工作:介绍了固态变压器的发展历程及出现的典型拓扑结构,在此基础上给出了交流三端口变换器采用高压级联整流级、中间隔离DC-DC变换级和低压逆变输出级三级式拓扑结构。针对三电平H桥单模块和单相级联变换器,分别建立其开关等效电路,推导电路方程表达式;针对双向半桥三电平DC-DC拓扑结构,分析其工作原理并推导其在移相控制条件下的功率传输特性。研究了适合级联整流级的三相DQ解耦控制策略,在模块间采用载波移相调制及模块内采用反相载波层叠调制的基础上,增加冗余开关选择,解决了三电平H桥多电平模块分电容电压均衡问题;针对中间级三电平半桥DC-DC变换器,应用双边三电平移相控制方式,推导不同模式功率传输特性,研究了一种轻载效率较高的中间隔离DC-DC变换级控制策略。在上述研究的基础上,搭建了交流三端口变换器系统MATLAB/Simulink仿真模型,仿真了输入级在系统启动和负载变化过程的动态特性,带载工作时网侧电流正弦性、单位功率因数运行等稳态性能;其次仿真了中间级采用双边三电平控制的工作原理和功率传输特性,并对比仿真验证了轻载时采用传统移相控制、单边三电平控制和双边三电平控制时各自流过中频变压器电流的大小;最后模拟了两个低压端口与高压端口之间的功率传输特性。在理论研究和仿真验证的基础上,构建了由三相整流和隔离DC-DC构成的能量交互小功率实验平台,完成基于FPGA芯片控制程序设计,给出了系统动静态性能,分别实验验证了三相级联整流器、隔离DC-DC变换器及多端口能量交互系统电路拓扑和控制策略的正确性及可行性。
[Abstract]:Because of its lack of flexible power flow control, the traditional power system equipment can not realize the two-way transmission of energy multi-node, it is difficult to provide a variety of power supply forms, and it is difficult to meet the development needs of smart grid in the future. Based on the development of power electronics technology, solid state transformers and other power electronic conversion devices can not only provide a rich interconnection interface for all kinds of renewable energy and energy storage systems, It will also provide a flexible control method for the future power flow intelligent allocation management and multi-terminal energy conversion. In this paper, an AC three-port converter applied in the future smart grid is studied. The following works are accomplished: the development of solid-state transformer and its typical topology are introduced. On this basis, the three-port AC converter with high voltage cascade rectifier stage, intermediate isolated DC-DC transform stage and low voltage inverter output stage is presented. For three-level H-bridge single-module and single-phase cascaded converters, the switching equivalent circuits are established, and the expressions of circuit equations are derived, and the bi-directional half-bridge three-level DC-DC topology is analyzed. Its working principle is analyzed and its power transmission characteristics under phase shift control are deduced. The decoupling control strategy of three-phase DQ suitable for cascaded rectifier stage is studied. On the basis of adopting carrier phase shift modulation between modules and inverse-phase carrier stacked modulation in module, the selection of redundant switch is increased. The voltage equalization problem of three-level H-bridge multilevel module is solved, and for the intermediate three-level half-bridge DC-DC converter, the power transmission characteristics of different modes are deduced by using the bilateral three-level phase-shift control mode. An intermediate isolated DC-DC transform level control strategy with high light load efficiency is studied. On the basis of the above research, the simulation model of AC three-port converter system MATLAB/Simulink is built, and the dynamic characteristics of input stage during system startup and load change are simulated, and the sinusoidal characteristics of grid-side current when working under load are simulated. The steady-state performance such as unit power factor operation is simulated. Secondly, the operation principle and power transmission characteristics of the intermediate stage using two-sided three-level control are simulated, and compared with the simulation results, the traditional phase-shifting control is used when the load is light. At last, the power transmission characteristics between the two low-voltage ports and the high-voltage ports are simulated. On the basis of theoretical research and simulation verification, a small power experiment platform of energy exchange composed of three-phase rectifier and isolated DC-DC is constructed. The control program based on FPGA chip is designed, and the dynamic and static performance of the system is given. The correctness and feasibility of the circuit topology and control strategy of three-phase cascade rectifier isolated DC-DC converter and multi-port energy interactive system are verified by experiments.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM46
本文编号：2248209
[Abstract]:Because of its lack of flexible power flow control, the traditional power system equipment can not realize the two-way transmission of energy multi-node, it is difficult to provide a variety of power supply forms, and it is difficult to meet the development needs of smart grid in the future. Based on the development of power electronics technology, solid state transformers and other power electronic conversion devices can not only provide a rich interconnection interface for all kinds of renewable energy and energy storage systems, It will also provide a flexible control method for the future power flow intelligent allocation management and multi-terminal energy conversion. In this paper, an AC three-port converter applied in the future smart grid is studied. The following works are accomplished: the development of solid-state transformer and its typical topology are introduced. On this basis, the three-port AC converter with high voltage cascade rectifier stage, intermediate isolated DC-DC transform stage and low voltage inverter output stage is presented. For three-level H-bridge single-module and single-phase cascaded converters, the switching equivalent circuits are established, and the expressions of circuit equations are derived, and the bi-directional half-bridge three-level DC-DC topology is analyzed. Its working principle is analyzed and its power transmission characteristics under phase shift control are deduced. The decoupling control strategy of three-phase DQ suitable for cascaded rectifier stage is studied. On the basis of adopting carrier phase shift modulation between modules and inverse-phase carrier stacked modulation in module, the selection of redundant switch is increased. The voltage equalization problem of three-level H-bridge multilevel module is solved, and for the intermediate three-level half-bridge DC-DC converter, the power transmission characteristics of different modes are deduced by using the bilateral three-level phase-shift control mode. An intermediate isolated DC-DC transform level control strategy with high light load efficiency is studied. On the basis of the above research, the simulation model of AC three-port converter system MATLAB/Simulink is built, and the dynamic characteristics of input stage during system startup and load change are simulated, and the sinusoidal characteristics of grid-side current when working under load are simulated. The steady-state performance such as unit power factor operation is simulated. Secondly, the operation principle and power transmission characteristics of the intermediate stage using two-sided three-level control are simulated, and compared with the simulation results, the traditional phase-shifting control is used when the load is light. At last, the power transmission characteristics between the two low-voltage ports and the high-voltage ports are simulated. On the basis of theoretical research and simulation verification, a small power experiment platform of energy exchange composed of three-phase rectifier and isolated DC-DC is constructed. The control program based on FPGA chip is designed, and the dynamic and static performance of the system is given. The correctness and feasibility of the circuit topology and control strategy of three-phase cascade rectifier isolated DC-DC converter and multi-port energy interactive system are verified by experiments.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM46
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