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Grid-forming VSC control in four-wire systems with unbalanced nonlinear loads

机译：具有不平衡非线性负载的四线系统中的网格形成VSC控制

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摘要

A grid-forming voltage source converter (VSC) is responsible to hold voltage and frequency in autonomous operation of isolated systems. In the presence of unbalanced loads, a fourth leg is added to provide current path for neutral currents. In this paper, a novel control scheme for a four-leg VSC feeding unbalanced linear and nonlinear loads is proposed. The control is based on two control blocks. Amain control commands the switching sequence to the three-phase VSC ensuring balanced three-phase voltage at the output; and an independent control to the fourth leg drives neutral currents that might appear. The proposed control is noninvasive in the sense that both control blocks are independently implemented, avoiding the use of complex modulation techniques such as 3D-SVPWM. Moreover, the main control is deployed in dqo reference frame, which guarantees zero steady-state error, fast transient response during system disturbances and mitigation of harmonics when nonlinear loads are present. Simulations and experimental results are presented to verify the performance of the proposed control strategy. (C) 2017 Elsevier B.V. All rights reserved.
机译：电网形成电压源转换器（VSC）负责在隔离系统的自主运行中保持电压和频率。在存在不平衡负载的情况下，增加了第四条支路，以提供中性点电流的电流路径。在本文中，提出了一种新的四腿VSC馈送不平衡线性和非线性负载的控制方案。该控制基于两个控制块。 Amain控制命令将开关序列传递给三相VSC，以确保输出端的三相电压平衡；而对第四臂的独立控制则驱动可能出现的中性点电流。从两个控制模块都独立实现的意义上来说，所提出的控制是非侵入性的，从而避免了使用复杂的调制技术（例如3D-SVPWM）。此外，主控制部署在dqo参考系中，可确保零稳态误差，系统扰动期间的快速瞬态响应以及存在非线性负载时的谐波缓解。仿真和实验结果被提出来验证所提出的控制策略的性能。 （C）2017 Elsevier B.V.保留所有权利。

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