Stabilizing Control Scheme for Small Scale Autonomous Distributed Power Supply System with Energy Leveling Units

本项目取得的主要成果可以概括如下：1）自主分布式电源系统的原型测试单元，即光伏单元、风力涡轮机发电单元、飞轮单元等，已经建成。推导了各单元的仿真模型。2）提出了一种新的最大功率点跟踪（MPPT）控制方案“基于电流控制环误差信号的极限环MPPT方案”（申请中的PAT.2005-069789）。仿真分析和在PIC单片机上的实验验证了该方法的有效性。最大功率跟踪控制器已被应用于一个风力涡轮机发电系统，证明了其非常简单的硬件结构，没有任何传感器的风速，轴向转速和输出功率，也证明了其简单的软件算法。Hils（硬件在环仿真）系统已建成，这是有用的系统动态行为分析。4）直流母线电压的稳定性进行了仿真研究。已经指出，在使用多个飞轮作为功率均衡设备的情况下，基于电池单元和飞轮单元之间的一种谐振而发生电压不稳定。提出了一种采用直流有源滤波技术的对抗控制方案。

The main results obtained in this project can be summarized as follows ;1)Prototype testing units for an autonomous distributed power supply system, i.e. photovoltaic unit, wind turbine generation unit, flywheel unit etc., have been constructed. Simulation model of each unit has been derived. Based on the model, a wind turbine simulator has been constructed by using a 2.2kW induction motor and a PM dc servomotor.2)A new MPPT (maximum power point tracking) control scheme "Limit cycle MPPT scheme based on a error signal in current control loop" has been proposed (PAT.2005-069789 under application). It's validity has been confirmed by simulation analysis and experiments with a PIC microcomputer. The proposed MPPT controller has been applied to a wind turbine generator system to prove its quite simple hardware configuration without any sensors for wind velocity, axial rotating velocity nor out power, and also to prove its simple software algorithm.3)Based on the simulation model of the system, HILS (Hardware In the Loop Simulation) system has been constructed which is useful for the system dynamic behavior analysis.4)Stability of the dc bus voltage has been studied by simulation. It has been pointed out that in some cases with plural flywheels used as power leveling equipments, voltage instability occurs based on a kind of resonance between a battery unit and flywheel units. A countermeasure control scheme with a kind of dc active filtering technique has been proposed.