LCL滤波的三相储能变流器及其控制策略研究

发布时间：2018-06-07 17:36

本文选题：分布式发电 + 储能变流器　；参考：《哈尔滨工业大学》2017年硕士论文

【摘要】：分布式发电在当今社会中受到越来越多的重视,储能系统对改善可再生能源发电的不确定性、功率波动等可起到重要作用。储能变流器作为可再生能源与电网之间的重要接口设备,其并网电流质量,如谐波畸变率,是重要指标。本文以典型的LCL三相电压型PWM变流器为研究对象,重点对畸变电网电压下储能变流器的电流控制策略进行研究。本文介绍了PWM变流器的拓扑结构和工作原理,建立了abc及αβ坐标系下的数学模型,设计了LCL滤波器参数并对其有源阻尼、无源阻尼谐振抑制作了分析。为简化电流控制器的复杂解耦,设计了αβ坐标系下的比例谐振电流内环控制器。在电网电压畸变的情况下,设计了网侧电流准比例谐振控制(QPR,Quasi Proportional Resonant Control)内环与重复控制外环叠加的复合控制策略。论文对控制策略进行了细致的推导,并从理论上分析了复合控制器对电网电压畸变的抑制作用。在电网电压畸变以及不平衡下采用基于双二阶广义积分器的锁相环,对正、负序分量进行分离,抑制谐波分量引起的相位波动,实现了对基波正序相位的准确跟踪。研究了控制网侧电流平衡以及母线电压平衡的电流控制策略,在Matlab/Simulink中搭建变流器在畸变及不平衡电网电压下的仿真模型,对复合控制策略的有效性进行了仿真验证。论文具体设计了主功率电路参数、外围保护电路、采样调理电路及驱动电路,完成了系统控制策略中锁相环模块、QPR控制器模块、重复控制器模块、SVPWM模块的数字化设计。最终,搭建了500W硬件实验平台,以TI公司的TMS320F28335芯片为主控制器,验证了各个模块设计效果,并通过联调验证了本文控制策略的有效性。
[Abstract]:Distributed power generation has been paid more and more attention in today's society. Energy storage system can play an important role in improving the uncertainty and power fluctuation of renewable energy generation. As an important interface equipment between renewable energy and power grid, energy storage converter is an important indicator of grid-connected current quality, such as harmonic distortion rate. In this paper, the typical LCL three-phase voltage source PWM converter is taken as the research object, and the current control strategy of the energy storage converter under the distorted grid voltage is studied. This paper introduces the topology and working principle of PWM converter, establishes the mathematical model of abc and 伪尾 coordinate system, designs the parameters of abc filter and analyzes its active damping and passive damping resonance suppression. In order to simplify the complex decoupling of the current controller, a proportional resonant current inner loop controller in 伪尾 coordinate system is designed. Under the condition of voltage distortion in power system, a compound control strategy is designed, in which the internal loop of QPR-Quasi proportional Resonant Control (QPR-Quasi proportional Control) and the external loop of repetitive control are superimposed. In this paper, the control strategy is deduced in detail, and the effect of the compound controller on the voltage distortion of the power system is analyzed theoretically. Under the condition of voltage distortion and unbalance, the phase locked loop based on double second order generalized integrator is used to separate the positive and negative sequence components, to suppress the phase fluctuation caused by harmonic components, and to realize the accurate tracking of the fundamental positive sequence phase. The current control strategy of current balance and bus voltage balance is studied. The simulation model of converter under distorted and unbalanced network voltage is built in Matlab / Simulink, and the effectiveness of the compound control strategy is verified by simulation. The main power circuit parameters, peripheral protection circuit, sampling conditioning circuit and driving circuit are designed in detail. The digital design of the QPR controller module and the SVPWM module of the repetitive controller module are completed in the system control strategy. Finally, the 500W hardware experiment platform is built, and the TMS320F28335 chip of TI company is used as the main controller, which verifies the design effect of each module, and verifies the effectiveness of the control strategy.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM46

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