【作者】 刘明；

【导师】 王建国；

【作者基本信息】 大连理工大学 ， 控制理论与控制工程， 2006， 硕士

【摘要】 目前,风力发电系统正向着直驱化方向发展,但直驱风力发电机产生的电能存在着电压幅值频率随风速变化、功率不稳定等诸多问题。本文为解决该问题,提出在直驱风力发电机输出端增加电能变换装置的方法,使输出的电能符合电能质量标准;采用现代电力电子技术结合先进的控制技术,分析并设计出适合于直驱风力发电系统的逆变装置。 本文在详细分析直驱风力发电系统特点和已有逆变装置的基础上,确立了三相不可控整流桥+SEPIC变换电路+单相全桥逆变电路的逆变装置主电路结构。依据各部分电路稳态分析结果,得到逆变装置关键参数的选择标准,并据此为额定功率为2kW的逆变装置选取了主要电路元器件。在利用PWM开关模型建立的SEPIC电路动态模型基础上,采用集成控制芯片UC3854为之设计了平均电流型控制器;还根据逆变电路的动态模型,为之设计了基于PI控制和无差拍控制的电压电流双闭环控制系统。 本文还应用专业仿真软件Saber、MatLab/Simulink对所设计的主电路和控制系统进行仿真分析,完成电路参数和控制器的优化设计。仿真结果表明:设计的逆变装置电路结构合理,控制策略正确,输出电能完全符合设计指标。在分析设计和仿真优化的基础上,采用专用于控制领域的高性能数字信号处理芯片TMS320LF2407A作为核心控制器,构造了逆变装置数字控制系统来验证所采用的控制方案。所构造的数字控制系统实现了变电路闭环控制、SPWM输出控制及逆变装置电能通道选择、装置保护、故障处理等功能,并且提供了良好的人机操作界面。更多还原

【Abstract】 At present, direct-drive technology is the development trend of wind power generation system (WPGS), but the electricity generated by direct-drive wind power generator has many problems, voltage amplitude and frequency is changing with wind speed, the power is also unstable. To solve these problems, this paper introduces a method adding power conversion device to the output terminal of wind power generator, to obtaining standard electricity. Modern power electronic technology and advanced control technology are used to analyze and design the device.In this paper, based on analysis the characteristic of direct-drive WPGS and other devices, the main circuit structure, which composed of three-phase full bridge rectifier, sepic chopper and single-phase full-bridge inverter, is presented. According to the steady analysis of different circuit parts, criterions for choosing inversion device’s key parameters are obtained, and decide the circuit components for a 2kW device. Utilizing dynamic model of sepic chopper, which established by PWM switch model, the average current controller is designed using integrated control circuit UC3854. By inversion device’s dynamic model, a current-voltage double closed-loop control system is designed through PI control and deadbeat theory.Special software MatLab/Simulink and Saber are used to simulate the circuit and control system, circuit parameters and controller were optimized. The simulation results indicate: the device’s circuit structure is reasonable, control strategy is right, the output electricity meets the design requirement. Based on the design and simulation results, high performance digital signal processor TMS320LF2407A is adopted to develop the digital control system, which carried out closed-loop control and SPWM control for inverter, multi-function about choosing electric power channel, protecting device and disposing fault for inverter, in addition, friendly human machine interface is provided.更多还原