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首页> 外文期刊>Emerging and Selected Topics in Power Electronics, IEEE Journal of >Cost-Effective DC Current Suppression for Single-Phase Grid-Connected PV Inverter
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Cost-Effective DC Current Suppression for Single-Phase Grid-Connected PV Inverter

机译：用于单相网连接的PV逆变器的经济高效的直流电流抑制

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摘要

Due to the disparity of power modules, asymmetry of driving pulses and measurement errors of sensors, dc currents may be injected to grid-connected photovoltaic (PV) inverters. The dc current injection may cause magnetic saturation of the power transformers. To solve this issue, this article thus proposes an effective current control strategy and compensation method, which does not require any extra sensor and hardware circuit. First, the root-cause of dc current injection is comprehensively analyzed. Subsequently, a proportional-integral-resonant (PIR) controller is proposed to eliminate the dc component caused by disparity of power modules, asymmetry of driving pulses and measurement errors of grid voltage. The injected dc current caused by grid current measurement error is estimated from the line-frequency ripple of the dc-link voltage, and then it is suppressed by a feedback compensation controller. In addition, the dc current rejection capability is evaluated, and the proposed method is benchmarked with the virtual capacitor-based method. Finally, experimental tests are performed on a 1.2-kW single-phase PV inverter to verify the effectiveness of the proposal.
机译：由于功率模块的差异，驱动脉冲的不对称性和传感器的测量误差，可以将DC电流注入到电网连接的光伏（PV）逆变器中。 DC电流喷射可能导致电力变压器的磁饱和。要解决此问题，本文提出了有效的电流控制策略和补偿方法，不需要任何额外的传感器和硬件电路。首先，全面分析直流电流注入的根本原因。随后，提出了一种比例 - 积分谐振（PIR）控制器，以消除由功率模块的视差引起的DC分量，驱动脉冲的不对称性和电网电压的测量误差。由电网电流测量误差引起的注入的DC电流从直流链路电压的线频率纹波估计，然后通过反馈补偿控制器抑制。此外，评估DC电流抑制能力，并且所提出的方法与基于虚拟电容的方法基准测试。最后，在1.2-kW单相PV逆变器上进行实验测试，以验证该提案的有效性。

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