A novel switching strategy for DC link voltage balance in parallel connected three-level diode clamped back-to-back converter systems serving to variable speed pumped storage plant

R. Selvaraj, T. Chelliah, D. Khare
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引用次数: 4

Abstract

Variable speed pumped storage plant (VSPSP) is a practical feasible solution to meet peak demand in power network. During recent era, doubly fed induction machine (DFIM) is preferred for the sites, where large variations in water head or surplus power available in the grid to increase the energy efficiency at part loads. In general, DFIM with parallel connected three-level diode clamped converter (3L-NPC) systems are employed in rotor circuit for large rated pumping applications (above 100 MW). However, parallel connected 3L-NPC suffers with DC link voltage imbalance due to neutral phase currents, which degrades the overall performance of the inverter. To overcome this issue, this paper proposes a novel switching strategy based on virtual switching vector selection scheme, which balances the DC link voltage for wide range of load variation without any additional circuitry. The effectiveness of proposed switching strategy is realized with MATLAB/Simulink environment and experimental validation is performed through 2.2 kW DFIM system.
变速抽水蓄能电站并联三电平二极管箝位背对背变换器直流链路电压平衡的一种新型开关策略
变速抽水蓄能电站是解决电网尖峰需求的一种切实可行的解决方案。在最近的时代,双馈感应电机(DFIM)是首选的网站,在水头或剩余电力在电网中有较大的变化,以提高部分负荷的能源效率。一般来说,DFIM与并联三电平二极管箝位变换器(3L-NPC)系统用于大额定泵应用(100mw以上)的转子电路。但是并联的3L-NPC由于中性相电流导致直流链路电压不平衡,从而降低了逆变器的整体性能。为了克服这一问题,本文提出了一种基于虚拟开关矢量选择方案的新型开关策略,该策略可以在不需要额外电路的情况下平衡大范围负载变化的直流链路电压。在MATLAB/Simulink环境下实现了所提切换策略的有效性,并通过2.2 kW DFIM系统进行了实验验证。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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