Virtual Oscillator Control (VOC) is an advanced nonlinear grid-forming controller used for power electronics interfaced distributed generation (DG). In order to improve the reliability of voltage source converter connecting to the disturbance grid, a feedback method with enhanced virtual impedance had been inserted into the control loop of the VOC-based inverter to suppress grid-injected harmonic currents. In this paper, a new grid-injected harmonic current suppression strategy with estimated voltage feedforward is proposed for a VOC-based voltage source inverter (VSI) connected to the distorted electrical grid. To achieve the control target, the Kalman-Filter is adopted to estimate the harmonic components of the grid voltage at the point of common coupling (PCC) and insert them to the feedforward control loop of the VOC-based inverter. Compared with the traditional VOC with enhanced virtual impedance method, the proposed control strategy has a slightly better ability to suppress the grid-injected harmonic current. A 3 kW/3-phase/120 V experimental prototype system designed on the DSPACE DS1202 platform has been developed to verify the effectiveness of the proposed control strategy.

中文翻译：

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基于卡尔曼滤波器的虚拟振荡器控制并网逆变器谐波电流抑制新方法

虚拟振荡器控制 (VOC) 是一种先进的非线性电网形成控制器，用于电力电子接口分布式发电 (DG)。为了提高电压源换流器接入扰动电网的可靠性，在基于VOC的逆变器控制回路中加入了一种增强虚拟阻抗的反馈方法来抑制并网谐波电流。在本文中，针对连接到失真电网的基于 VOC 的电压源逆变器 (VSI)，提出了一种新的具有估计电压前馈的并网谐波电流抑制策略。为实现控制目标，采用卡尔曼滤波器估计公共耦合点（PCC）电网电压的谐波分量，并将其插入基于VOC的逆变器的前馈控制回路。与传统增强虚拟阻抗法的VOC相比，所提出的控制策略对并网谐波电流的抑制能力略强。开发了在 DSPACE DS1202 平台上设计的 3 kW/3 相/120 V 实验原型系统，以验证所提出的控制策略的有效性。