文档介绍：摘要
风力发电因其环保性、经济性、灵活性等诸多优点,正受到日益广泛的关注,并在世界范围得以迅猛发展。并网逆变控制器是风电机组与公共电网的能量接口,其性能优劣直接影响机组输出特性及电网电能质量。本文针对小型并网逆变控制器,从其模型分析、检测控制以及软件实现等方面展开研究与设计,主要包括以下几方面的工作:
首先,根据机组电压及功率等级,确定了并网逆变控制器功率电路的拓扑结构,并分析推导了其在三相坐标系下的静态数学模型、d-q旋转坐标系下的等效受控源模型及其动态小信号模型,为主电路参数选取和控制环节的补偿校正提供理论基础。
其次,将瞬时无功功率理论引入检测与控制环节,将其与PID控制策略结合,实现并网逆变控制器的电压、电流双环控制,并辅以仿真软件对控制环节的补偿校正参数进行计算优化,以保证在发电、馈电平衡的前提下,减小或避免风电机组对电网的负面影响。
基于上述理论基础,计算确定了功率电路中藕合电感、直流母线电容等关键参量;根据系统的双环控制结构,以TMS320F2812型DSP为核心,设计了系统控制环节中信号采样、锁相跟踪、PI调节、SPWM形成等各功能模块。
最后,采用仿真软件MATLAB/SIMULINK对并网逆变器功率电路及控制环节进行了仿真与分析;S 的编译环境下,采用 C 语言进行编程。
关键词:风力发电;并网逆变器;SPWM;双环PID控制
ABSTRACT
Wind power is attracting more attention due to its performance of environmental protection, economy, and flexibility and so on, and is rapidly developing in the world. Grid-connected inverter is an energy interface between wind power generation system and power quality of the grid. In this paper, the model, detection and control of low-voltage grid-connected inverter, and its realization of software, were investigated, the work mainly includes the following aspects:
First of all, power circuit topology of grid-connected inverter was determined based on voltage and power grade of wind power generation system. Its static mathematic model in the three-phase coordinate, equivalent controlled resource model in d-q rotating coordinate and dynamic small-signal model were analyzed derived, which provided theoretical basis for parameter selection of the main circuit pensation and correction of control section.
Secondly, the instantaneous reactive power theory to the test and control link, with bination, realize PID control strategy of grid inverter controller voltage, current 2-ring control, supplemented by simulation software to control pensation correction parameter optimization, to ensure that the calculated in power generation, feeder balance premise, reduce or avoid the wind generator for grid negative influence.
Based on above foundation, calculate and determine the theory of