Improved impedance reshaping control strategy for dual phase-locked loop/matlab simulink

Weak current networks often have characteristics such as high impedance and low short-circuit ratio, which can easily lead to system instability and limit power transmission capacity. In order to improve the output power of the inverter, a simulation model was built based on the impedance reshaping method, which not only preserves the fast dynamic response, but also extends the dynamic power limit to the vicinity of the static power limit, keeping the system stable around 0.9 p.u. Finally, this article conducted a simulation comparison between the two control strategies before and after improvement, verifying the effectiveness of the impedance reshaping strategy.
The simulation results show that the system remains stable within the output power range of 0-700W, and the phase-locked loop has good tracking ability. This indicates that the improved impedance reshaping control strategy significantly improves the stability boundary, greatly increases the output power, and is almost close to the static power limit.
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