级联电路DSTATCOM直流电容电压控制策略研究

Zhou Yuan, Xia Mingchao
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引用次数: 2

摘要

级联DSTATCOM具有损耗低、效率高、输出电压谐波含量少、易于模块化等优点,已广泛应用于各种DSTATCOM样机和工程中。然而,这种DSTATCOM结构在直流链路中存在固有的电容电压不平衡,这可能导致DSTATCOM的异常运行,特别是在DSTATCOM的瞬态过程运行中。传统的DSTATCOM直流母线电压控制策略是三电平直流电压控制。但是,当三相电路全链直流电容低于目标值时,一级控制首先失去控制功能,最后电压出现严重不平衡。在这种情况下,无法实现对电网电压的动态补偿。
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A study on DC capacitor voltage control strategy of cascade circuit DSTATCOM
The cascade DSTATCOM has been widely used in various DSTATCOM prototypes and projects due to its advantages such as low loss, high efficiency, little harmonic content in output voltage, easy modularization, and so on.However,this kind of DSTATCOM structure contains inherent unbalance capacitor voltage in the DC-link,which may lead to abnormal running of DSTATCOM,especially in the transient process running of DSTATCOM. Traditional DSTATCOM DC-bus voltage control strategy is three-level DC voltage control. However, when the DC capacitor of all the chain of three-phase circuit is lower than the target value, the first level control will firstly lose control function, then finally the voltage will be a serious imbalance. In this case, it cannot be achieved to the network voltage dynamic compensation.
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