局域电网电能质量综合补偿系统的设计与分析

针对供电系统存在的电网电压跌落及电压波动、功率因数低、大量的高次谐波等问题,提出了一种电能质量综合补偿系统的设计方案,给出了系统硬件结构,基于瞬时无功功率理论分析了α-β坐标中电压发生畸变及不对称情况下的检测算法,并对该检测算法进行了仿真实验。实验结果表明,该电能质量综合补偿系统在0.02~0.1 s时能实时地检测出电压跌落的起始时刻、终止时刻及跌落幅值大小;可较好地检测出合成电压信号中的谐波电压,数据检测和计算处理基本没有造成时间上的延迟。     

基于ARM9和数字信号处理双处理器的馈线远方终端设计

采用Aq91RM9200和TMS320F2812高性能处理器芯片,设计了一种基于ARM9和数字信号处理双处理器的馈线远方终端,给出了硬件总体结构,详细介绍了模拟量处理、双口RAM、充电器等关键硬件设计方法,并引入嵌入式操作系统设计主控软件。试验结果表明,终端工作可靠、实时性强,满足配电网自动化系统要求。     

Improve power quality of coal mine power network based on gray system theory

Unified Power Quality Controller（UPQC） was proposed to comprehensively improve power quality of coal mine power network and its basic structure and operation principle was introduced. In order to overcome time lag of Active Power Filter（APF） in compensating harmonic and reactive current, a novel method based on gray system theory was proposed to predict harmonic current and other distortion component. The mathematical model of component to be compensated was constructed by data sequence of distortion component, which could exactly forecast compensation signal of next period. The optimal control strategy was selected according to the principle of output signal approaching component to be compensated as near as possible. Before predicating each time the oldest data was eliminated while the latest data was added to data sequence. Then new predication model was established once again. The results show that the method can always construct mathematical model with variation of system parameters, reflect the latest state of system and not increase calculation quantity. The feasible and effective control strategy can improve power quality of coal mine power network.