Maintaining the stability of DC bus voltage is the premise of safe and efficient operation of DC energy conversion system. Aiming at the problem that the interaction between AC/DC interconnecting converter and constant power load will reduce the voltage quality of DC bus and cause system oscillation, this paper establishes an impedance model between DC port and constant power of AC/DC interconnecting converter, and studies and analyzes the influence of DC voltage sag control and load power on the stability of DC system. A DC voltage inertial support control method is proposed, which can increase the capacitive component of DC port impedance of AC/DC converter, enhance the inertia and stability of DC system, and improve the ability of bus voltage to resist load fluctuation.
In this paper, a filtering antenna array based on substrate integrated waveguide technology is designed. The antenna works in the Sub 6G band of 5G, and the array effect is formed by etching slots on the upper surface of the cavity at specific locations to excite the patch, while the filtering effect is generated because of the SIW cavity and patch coupling, forming a high gain filtering antenna. Simulation results show that the filter antenna has 3% bandwidth, peak gain greater than 10dBi in the operating band, and front-to-back ratio greater than 20dB.
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