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Dual‑module VSG control strategy under unbalanced voltage conditions
Zhanghai Shi,Jinhao Ruan,Yunyu Hong,Mingyue Li,Dong Liu 전력전자학회 2023 JOURNAL OF POWER ELECTRONICS Vol.23 No.6
The virtual synchronous generator (VSG), as a grid-connected technology, has gain more and more attention because of its unique merits including its ability to reshape inertia and damping. These merits enable renewable energy to be smoothly integrated into the grid. Unbalance between three-phase voltage in the steady state is a common phenomenon in the grid, which distorts the output current of the VSG. However, on many occasions, inserting symmetrical current into the grid is necessary. To solve this problem, a dual-module VSG control strategy is proposed in this paper. Through this strategy, the positive and negative sequence output powers of the VSG can be correctly identifi ed and separately controlled. Then the output current can be kept symmetrical by controlling the negative sequence output power of the VSG to be zero. Finally, the proposed strategy is verified by simulation and experimental results.
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Ruan, Jinhao,Shi, Zhanghai,Yu, Maochi,Wang, Shisong The Korean Institute of Power Electronics 2021 JOURNAL OF POWER ELECTRONICS Vol.21 No.10
Similar to synchronous generators (SGs), the phenomenon of low-frequency oscillation (LFO) may occur when virtual synchronous generator (VSG) is involved in power grid, thereby negatively affecting the stability of the power system. In this paper, the oscillation mechanism of the power system composed of a VSG and infinite grid (single-VSG infinite-bus system) is analyzed, the conditions for the occurrence of LFO are unveiled, and a simplified damping selection method to suppress the LFO is provided, considering the adjustable damping of VSG. First, a small-signal model of the single-VSG infinite-bus system is established. The order of this system model is reduced using the damping torque analysis. Then, the mechanism of LFO under various dampings is analyzed. On this basis, a reasonable selection method of damping is drawn. The range of damping, where LFO converges, can be determined and the appropriate damping coefficient can be selected using this method. Finally, the effectiveness of the proposed method is verified by simulations and experiments.
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