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首页> 外文期刊>IEEE Transactions on Power Electronics >Control of Three-Phase Bidirectional Current-Source Converter to Inject Balanced Three-Phase Currents Under Unbalanced Grid Voltage Condition
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Control of Three-Phase Bidirectional Current-Source Converter to Inject Balanced Three-Phase Currents Under Unbalanced Grid Voltage Condition

机译：三相双向电流源转换器的控制，以在电网电压不平衡的情况下注入平衡的三相电流

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摘要

A single-stage, bidirectional, current-source converter (CSC) topology to interface a dc microgrid with an ac grid is reported in the literature. In this topology, under a balanced grid voltage condition, the dc-link inductor current can be regulated over a wide range—from zero to rated value—while the ac-side current has low harmonic distortion. However, unbalanced grid voltages result in second-harmonic pulsation in the current and power on the dc side of the converter. In addition, the ac-side currents will be unbalanced due to the presence of a negative-sequence component. This would result in undesired tripping of the converter if one of the phase currents exceeded its rated value. Various control loop structures for the operation of voltage-source converter under unbalanced grid voltage conditions are reported in the literature. However, use of similar control loop structures for CSC may lead to unstable operation. Therefore, a control scheme to inject balanced three-phase currents into the ac grid under an unbalanced grid voltage condition is proposed in this paper. The stability of the proposed control scheme is studied using a small-signal model of the converter. Performance of the proposed control scheme is studied using MATLAB/Simulink and is experimentally validated.
机译：文献报道了一种单级，双向，电流源转换器（CSC）拓扑结构，可将直流微电网与交流电网连接。在这种拓扑结构中，在电网电压平衡的情况下，直流链路电感器电流可以在从零到额定值的较大范围内调节，而交流侧电流的谐波失真较低。但是，不平衡的电网电压会导致转换器直流侧的电流和功率产生二次谐波脉动。另外，由于存在负序分量，交流侧电流将不平衡。如果相电流之一超过其额定值，则将导致转换器意外跳闸。文献报道了在不平衡电网电压条件下用于电压源转换器的各种控制回路结构。但是，对CSC使用类似的控制回路结构可能会导致运行不稳定。因此，提出了一种在不平衡电网电压条件下向交流电网注入平衡的三相电流的控制方案。使用转换器的小信号模型研究了所提出的控制方案的稳定性。提出的控制方案的性能使用MATLAB / Simulink进行了研究，并进行了实验验证。

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