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首页> 外文期刊>Industrial Electronics, IEEE Transactions on >An Enhanced Grid Current Compensator for Grid-Connected Distributed Generation Under Nonlinear Loads and Grid Voltage Distortions
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An Enhanced Grid Current Compensator for Grid-Connected Distributed Generation Under Nonlinear Loads and Grid Voltage Distortions

机译：用于非线性负载和电网电压失真的并网分布式发电的增强型电网电流补偿器

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摘要

This paper introduces an advanced current control strategy for grid-connected operations of distributed generation (DG), which supports the DG to transfer a sinusoidal current into the utility grid despite the distorted grid voltage and nonlinear local load conditions. The proposed current controller is designed in the synchronous reference frame and composed of a proportional–integral (PI) controller and a repetitive controller (RC). An RC serves as a bank of resonant controllers, which can compensate a large number of harmonic components with a simple delay function. Hence, the control strategy can be greatly simplified. In addition, the proposed control method does not require the local load current measurement or harmonic analysis of the grid voltage. Therefore, the proposed control method can be easily adopted into the traditional DG control system without installation of extra hardware. Despite the reduced number of sensors, the grid current quality is significantly improved compared with the traditional methods with the PI controller. The operation principle of the proposed control method is analyzed in detail, and its effectiveness is validated through simulated and experimental results.
机译：本文介绍了一种用于分布式发电（DG）并网运行的高级电流控制策略，该策略支持DG在电网电压失真和局部负载条件不佳的情况下将正弦电流传输到公用电网。提出的电流控制器设计在同步参考框架中，由比例积分（PI）控制器和重复控制器（RC）组成。 RC用作一组谐振控制器，可通过简单的延迟功能来补偿大量谐波分量。因此，可以大大简化控制策略。另外，所提出的控制方法不需要局部负载电流测量或电网电压的谐波分析。因此，所提出的控制方法可以很容易地在传统的DG控制系统中采用，而无需安装额外的硬件。尽管减少了传感器数量，但与采用PI控制器的传统方法相比，电网电流质量仍得到了显着改善。详细分析了该控制方法的工作原理，并通过仿真和实验结果验证了其有效性。

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