A hybrid converter for medium voltage using a low-voltage current source active filter connected via a series capacitor

S. Papadopoulos, M. Rashed, C. Klumpner, P. Wheeler
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引用次数: 13

Abstract

This paper proposes a new three phase hybrid inverter topology suitable for medium to high voltage inverter applications. The topology shown in Fig. 1 consists of a 3-phase VSI rated at medium voltage acting as a main inverter bridge processing the bulk power whilst being connected in parallel to a CSI acting as an active filter to cancel out the switching current ripple produced by the VSI. The CSI is connected via a series capacitor which minimises the voltage stress to only a small fraction of the fundamental grid voltage via a control approach shown in the paper. Therefore, the added installed power of the CSI is less than 4% of the main inverter bridge which should account for a small added cost. As a result, the hybrid topology allows for optimal device utilization to achieve high output current quality with minimal device ratings and potentially improved efficiency. The control of the CSI is independent to the main inverter bridge which means that the auxiliary converter solution can be retrofitted to existing medium voltage installations for power quality improvement.
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一种使用低压电流源有源滤波器并通过串联电容器连接的中压混合变换器
本文提出了一种适用于中高压逆变器应用的新型三相混合型逆变器拓扑结构。图1所示的拓扑结构由一个额定中压的三相VSI组成,作为主逆变器桥接处理大功率,同时并联到一个CSI,作为有源滤波器,以抵消VSI产生的开关电流纹波。CSI通过串联电容器连接,通过本文所示的控制方法将电压应力降至仅占基本电网电压的一小部分。因此,CSI的新增装机功率小于逆变器主桥的4%,应占到较小的新增成本。因此,混合拓扑允许最佳的器件利用率,以最小的器件额定值实现高输出电流质量,并可能提高效率。CSI的控制独立于主逆变器桥,这意味着辅助转换器解决方案可以改造到现有的中压装置,以改善电能质量。
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