Generalized Closed-Loop Control Schemes with Embedded Virtual Impedances for Voltage Source Converters with LC or LCL Filters
Generalized Closed-Loop Control Schemes with Embedded Virtual Impedances for Voltage Source Converters with LC or LCL Filters
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DOI：
10.1109/tpel.2011.2168427
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发表时间：
2012-04-01
影响因子：
6.7
通讯作者：
Li, Yun Wei
中科院分区：
文献类型：
--
作者：
He, Jinwei;Li, Yun Wei
本文提出了一种适用于带LC或LCL输出滤波器的电压源换流器的广义闭环控制方案。建议GCC计划有一个单回路控制逆变器输出（电压或电流）和两个并联的虚拟阻抗项使用额外的测量。虚拟阻抗可以是等效内部阻抗或外部阻抗（或两者），这取决于它们的控制项和反馈变量选择。内阻抗项主要负责为滤波器电路提供期望的阻尼，而外虚拟阻抗项可以有效地调节变换器系统闭环输出阻抗。由于GCC方案中的每一项都可以独立控制，因此所提出的GCC方案具有很大的灵活性，并且可以容易地实现和解释传统的单回路和多回路控制方案及其不同变体的性能。此外，GCC方案提供了每个控制项的不同物理意义，这使得控制参数整定更直接和鲁棒。此外，如本文所示，建议的GCC计划可以解决一些传统上具有挑战性的控制目标，避免谐波滤波或导数项。实验室VSC原型的实验结果得到验证建议GCC计划。
In this paper, a generalized closed-loop control (GCC) scheme is proposed for voltage source converters (VSCs) with LC or LCL output filters. The proposed GCC scheme has a single-loop control of inverter output (voltage or current) and two parallel virtual impedance terms using additional measurements. The virtual impedance can be the equivalent internal impedance or external impedance (or both), depending on their control term and feedback variable selection. The internal impedance term is mainly responsible for providing desired damping to the filter circuit, and the external virtual impedance term can effectively adjust the converter system closed-loop output impedance. As each term in the GCC scheme can be controlled independently, the proposed GCC scheme has great flexibility and can easily realize and explain the performances of the traditional single-and multiloop control schemes and their different variations. Moreover, the GCC scheme provides a distinct physical meaning of each control term, which makes the control parameter tuning more straightforward and robust. Additionally, as shown in this paper, the proposed GCC scheme can tackle some traditionally challenging control objectives by avoiding the harmonics filtering or derivative terms. Experimental results from laboratory VSC prototypes are obtained to validate the proposed GCC scheme.