The development trend of high shares of renewables and power electronics has increased the demand for new energy converters in the power system, but there is a lack of systematic research on the stability of different types of converters when transmitting power, which is worth exploring in depth. In this study, the power transfer capabilities of grid-forming and grid-following converters are investigated separately through an equivalent circuit diagram and phasor diagram when connected to the grid, and a quantitative relationship between converters’ power transmission limit and short circuit ratio under static stability conditions is obtained, leading to the conclusion that, in terms of power transmission, grid-forming converters are more suitable for weak grids with high damping and low inertia, whereas grid-following converters are more suitable for strong grids with high inertia. The conclusions are further verified by constructing the converter grid-connected models for different grid strengths through the PLECS simulation platform and the real-time simulation RTBOX1 and F28379D launchpad platform.
In order to accurately evaluate the real-time consumption capacity of new energy considering the dynamic coordination of network sources in real-time scale, a new energy real-time consumption capacity evaluation model considering the dynamic constraints of network sources is established. Firstly, according to the operation plan of thermal power unit, the transmission plan of tie line, the regulation margin of transformer ratio and the capacity of each node’s reactive device, the dynamic constraint of network source is set. Then, according to the grid parameters, the real-time prediction of new energy station operation and the real-time prediction of each node load demand, the line power flow security, node power balance, node voltage security and new energy station operation constraints are set. Finally, two optimization objectives of new energy active power maximum and minimum consumption are set up, and a new energy real-time consumption capacity evaluation model considering the dynamic constraints of network sources is established, which takes the active and reactive power of thermal power unit, the active and reactive power of tie line, the transformer transformation ratio, the reactive capacity of reactive device switching, and the active and reactive power of new energy as decision variables. The validity of the model is verified by 4-node system.
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