EPS inverter protection circuit analysis – overvoltage, overcurrent protection Emergency...
How do inverters ensure the stability and continuity of power output in EPS?
Inverter in EPS to ensure the stability and continuity of power output mainly through the following technologies:
main content
Phase-locked control technology
Phase-locked control technology is used to ensure the phase continuity of the inverter output current, especially when the grid voltage drops to zero. The normal grid angular frequency before the grid voltage drop is latched as the reference angular frequency of the zero voltage range, and the phase lock control is carried out to provide continuous phase for the output current of the inverter. This method avoids the problem that the inverter loses the reference voltage when the grid voltage drops to zero, which causes the current output disorder.
SPWM (Sinusoidal Pulse Width Modulation) technology
SPWM technology is used to generate a series of rectangular pulse waves of equal amplitude and unequal width equivalent to sine waves, so as to realize the conversion from DC to AC. This technique can improve the waveform quality of the inverter output voltage, making it closer to the ideal sine wave, thus improving the stability of the power output.
Power Electronic Transformer (PET) technology
PET can realize the function of variable voltage and isolation, and adjust the output voltage. The output impedance of PET secondary converter can be adjusted by modifying control parameters or control strategies to improve the system stability. This method can improve system stability in the case of weak power grids.
Virtual impedance and digital filter control strategy
The stability of the system can be improved by using the stability control strategy of virtual impedance and digital filter element. These strategies improve the dynamic response and stability of the system by adjusting the output impedance of the inverter.
Dual-order generalized integrator phase-locked loop (DSOGI-PLL) technology
DSOGI-PLL can significantly improve system stability in the case of imbalance between grid voltage and grid impedance. This phase-locked loop technology enhances the stability of the system under unbalanced network conditions by improving the phase detection capability of the inverter.
Fast phase detection method
The fast phase detection method can be applied to the three-phase grid-connected system to improve the response speed of the inverter to the phase change of the grid, so as to enhance the stability of the system.
CONCLUSION
Through the comprehensive application of the above technologies, the inverter in EPS can ensure the stability and continuity of power output under various grid conditions, and meet the needs of emergency power supply.
EPS BATTERY SERIES
The centralized power supply for fire emergency lighting is a kind of backup power supply equipment, which provides power guarantee for emergency lighting equipment to ensure that the on-site lighting equipment can operate normally in emergency situations such as fire. Provide a long-term backup power supply to meet the needs of the emergency lighting system.
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