The VSG strategy not only emulates the characteristics of TSG but also participates in voltage regulation, inertia support, and other control functions, while endowing the static grid-connected inverter with rotational inertia and damping characteristics, so as to enhance its ability to suppress fluctuations (Guo et al., 2023).
This application demonstrates a grid-connected inverter with the ability to act as a virtual synchronous generator (VSG). The VSG consists of an energy source, a converter, and a control mechanism. The VSG control block is based on the following the swing equations for SGs. Swing Equation: θ = 1 J T e T m D p θ Electromagnetic torque:
For this purpose, a strategy of grid-connected control of VSG with virtual impedance is proposed. Firstly, the VSG mathematical model is established and virtual impedance is introduced into the VSG electrical portion to improve the grid-connected inverter output characteristics.
An improved VSG control strategy for a four-leg inverter is proposed. The improved virtual impedance control and power calculation method are used to keep the output voltages symmetrical and stable in the case of load symmetry. The results show that the voltage unbalance ratio can be reduced by 89%.
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Grid-forming, particularly those utilizing droop control and virtual synchronous generators (VSG), can actively regulate the frequency and voltage of microgrid systems, …
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Introduction The global transition toward renewable energy sources has intensified the demand for grid-connected energy storage inverter. These inverters play a pivotal role in …
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At the same time, virtual rotational inertia and damping are key variables in the VSG control strategy [12]. This article first models the grid-connected inverter and analyzes the …
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For this purpose, a strategy of grid-connected control of VSG with virtual impedance is proposed. Firstly, the VSG mathematical model is established and virtual impedance is …
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To this end, an adaptive supplementary control strategy for VSG-based inverter control system with voltage and current dual control structure was proposed in [22], to realize …
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When grid causes transient fault, system performance will deteriorate. During LVRT period, grid-connected inverters will be affected by negative sequence components, second …
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Under complex grid conditions, the grid voltage usually has an imbalance, low order harmonics, and a small of DC bias. When the grid voltage contains low order harmonics …
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As more and more renewable energy generations (REGs) are connected to the power grid through grid-following converters, the lack of inertia has become a challenge to grid …
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This application demonstrates a grid-connected inverter with the ability to act as a virtual synchronous generator (VSG). VSG model The VSG consists of an energy source, a …
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Virtual synchronous generator (VSG) control technology can simulate the output characteristics of a synchronous generator. VSG can effectively solve the problem that the …
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This endows the grid-connected inverter with virtual inertia and damping capabilities. Moreover, under VSG control, the inverter can participate in regulating the grid …
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The VSG strategy not only emulates the characteristics of TSG but also participates in voltage regulation, inertia support, and other control functions, while endowing …
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Virtual synchronous generator (VSG) control has positive effects on the stability of microgrids. In practical power systems, both single-phase loads and three-phase unbalanced …
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The stable operation range of the VSG control grid-connected inverter system is studied with the objective to improve the stability and robustness of the VSG-controlled grid …
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Virtual synchronous generator (VSG) control is an effective way to increase the equivalent inertia of grid connected inverter system and improve the stability of the power grid. …
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In the control process of the VSG grid-connected system, the actual output P and Q are firstly calculated from the voltage of PCC and the outlet current of the inverter. P is fed …
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