摘要
级联H桥型的串联补偿设备在补偿配电网系统侧电压跌落时具有输出波形好、功率容量大、易于扩展等优点,但由于级联型逆变器结构和控制的复杂性,增加了器件发生故障的可能性,降低了串联补偿设备运行的可靠性。为提高串联补偿设备运行的可靠性,此处分析了串联补偿设备可能出现的故障类型,结合不同种类故障的特点,提出了一种适用于级联型串联补偿设备的故障诊断方法。该方法只需检测串联补偿设备输出侧的电压和电流,经一定的等效和计算可以诊断出故障,不受电压和电流变化的影响,计算量小,易于实现。装置连续运行中能快速诊断和切除故障,并通过改变逆变器的调制方式使串联补偿设备依旧正常工作。仿真算例及实验结果验证了该方法的可行性。
The voltage stability can be maintained by the series compensation equipment while the voltage sag of dis- tribution system side occurs.The cascade H-bridge series compensation equipment has many advantages such as lower harmonic injection into the power system,high power capacity,easily to be extended and so on.However,due to the complexity of structure and control of the cascade converter the possibility of device failure is increased.In order to improve the reliability of series compensation equipment, the possible fault type of series compensation devices is ana- lyzed and combined with the characteristics of different types of faults, a fault diagnosis method for the cascade series compensation equipment is proposed.This method only need to detect the voltage and current of output side in series compensation equipment,the fault can be successfully dignosed by a certain equivalent and computation.This method has the advantages such as small amount of calculation and easy to implement, and is not affected by voltage and current changes.This device can rapidly diagnosis and remove faults device in continuous operation ,then by changing the modulation of inverter makes the series compensation device work normally.The simulation examples and experi- mental results prove the validity of this method.
出处
《电力电子技术》
CSCD
北大核心
2014年第8期11-15,共5页
Power Electronics
基金
国家自然科学基金(51107134)
国家自然科学(青年)基金(51307158)~~
关键词
串联补偿设备
故障诊断
调制
series compensation equipment
fault diagnosis
modulation
