A Novel VSG Control Strategy for UPS Voltage Source Inverter with Impulsive Load

Abstract

This paper proposes a novel control strategy to alleviate the impulsive current for Uninterruptible Power Supply (UPS), which is designed based on the theory of virtual synchronous generator (VSG) and dynamic switching method. The power quality of UPS will become distortion when the instantaneous impulsive load is imposed on UPS. Especially, the output current of UPS will increase quickly in short time. In order to maintain the uninterrupted output voltage and reduce the distortion of output voltage of UPS under the action of instantaneous impulse load, Dynamic switching method is proposed to resist impulse load with large scale impulse current, Meanwhile, the VSG control strategy is adopted to deal with the slow power switching and provide virtual inertia for the system, so that the output voltage of UPS can remain uninterrupted and stable. Finally, simulation and experimental results show that this method can effectively suppress the impulse current, reduce the output voltage distortion of UPS inverter, and ensure the good performance of On-line UPS under impulse load.

Coordinated Control Strategy Based on Virtual Synchronous Generator Technology in New Energy System

“…This furnishes the grid-connected inverters of renewable energy units with essential inertia and damping characteristics, addressing the inherent issues of low inertia and weak damping associated with these units. Reference [2] introduces an energy storage device for supporting primary energy output on DC busbars. Through VSG inverter control based on virtual inertial moment, the transient stability characteristics of the system can be dynamically optimized.…”

Low-Cost/High-Precision Smart Power Supply for Data Loggers

“…An uninterrupted power supply (UPS) [11][12][13][14][15][16] is a device that can continuously provide energy in case of a power outage. They have their own power supplies inside and receive, adjust, and deliver AC output, but this energy is stored as DC through requirement to continue the charging after the shutdown persists.…”

“…Figure13. Graph of (a) Switching between AC and battery on 12 V with 1 A, (b) Switching between battery and AC on 12 V with 1 A, (c) Switching between AC and battery on 5 V with 1 A, (d) Switching between battery and AC on 5 V with 1 A, (e) Switching between AC and battery on 3.3 V with 1 A, (f) Switching between battery and AC on 3.3 V with 1 A.…”