Abstract
High frequency resonance (HFR) is a subsistent problem which affects the operation of the voltage source converter (VSC) connected to the parallel compensated grid. The appearance of HFR introduces a significant high frequency component in the grid voltage, thereby the operation of VSC system will be seriously affected. For enhancing the operation capability of VSC system, an HFR damping method based on the voltage feedforward control is proposed in this paper, which can reshape the VSC system impedance effectively in a wideband range. Besides, different with the existing HFR damping methods, the proposed method introduces a correction factor instead of the series virtual impedance with fixed value, so that the effect of impedance reshaping is irrelevant to the parameters of controlled object. In addition, this paper analyzes the fundamental control performance of VSC system after equipping the proposed method, for verifying that the proposed method will not worsen the fundamental control. Experimental results are given to validate the effectiveness of the proposed damping method.
Highlights
As an essential grid-connected device, voltage source converter has been widely used in the renewable power generation systems and the distributed power grids
The existing researches have pointed out that, the grid-connected voltage source converter (VSC) system has the issue of high frequency resonance (HFR) when it connects to the grid with parallel compensation [9,10,11,12], since the impedance of parallel compensation grid behaves as the capacitance characteristic [7,8], while the impedance of VSC system tends to be an inductance in high frequency [11,12,13]
For the purpose of phase amendment for the VSC system impedance more effectively and practicably, thereby improve stability of VSC system, this paper develops an High frequency resonance (HFR) damping method based on the voltage feedforward (VFF) control, which can be universal for different VSC systems without parameters redesigning
Summary
As an essential grid-connected device, voltage source converter has been widely used in the renewable power generation systems and the distributed power grids. The damping methods based on current feedback [18,19] introduce a series impedance which can effectively achieve impedance reshaping at a fixed frequency point [18] or in a wide frequency range [19], they have been widely employed in the application of HFR damping [12,13,14,15]. For liberating the frequency detection component, [23] introduced a virtual impedance which is effective within the wideband range, so that the impedance phase of VSC can be reshaped in a wide frequency, the stability of VSC can be guaranteed well during the transient process of compensation degree changes. For the purpose of phase amendment for the VSC system impedance more effectively and practicably, thereby improve stability of VSC system, this paper develops an HFR damping method based on the voltage feedforward (VFF) control, which can be universal for different VSC systems without parameters redesigning.
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