8kW Inverter Based On Energy Storage Of Lead-acid Batteries

This paper focuses on the design of an 8k W inverter based on lead-acid battery energy storage,which can achieve 220V/50 Hz stable AC output.Distributed energy storage systems are often used in modern power grid systems to achieve rational deployment and use of power resources.At present,a distributed storage system often uses a battery as an energy storage unit,and the battery output is direct current.Therefore,it is necessary to convert the direct current into an alternating current that can be used by the device through a corresponding discharge system.In various occasions where power supply requirements are high,a backup power system is also required to ensure system power continuity.In the backup power system,it is also necessary to establish a corresponding discharge system to convert the battery DC power into AC power to supply power to the device.In this context,an 8k W inverter based on lead-acid battery energy storage is designed and the performance of the prototype verification system is made.This thesis first analyzes the development history and research status of the inverter,and briefly introduces the lead-acid battery.Comparing the two different inverter structures to determine the twostage structure of the inverter using the pre-boost post-stage inverter.The common boost topology is analyzed.By comparison,it is determined that the pre-stage boost circuit adopts a push-pull topology,and the transformer adopts a three-transformer structure of a primary parallel sub-series.The postinverter topology uses a full-bridge topology,and the switching transistor modulation mode is SPWM unipolar modulation.The auxiliary power supply topology adopts the flyback topology,and the high-frequency transformer design is introduced in detail,and the device selection is briefly described.The pre-stage boost circuit adopts push-pull topology,and the driver chip adopts EG7500.For the problem that the drive board drive capability is insufficient,the peripheral circuit is built to improve the chip drive capability.The high-frequency transformer is introduced in detail,and the selection of the circuit power device is briefly introduced.At the same time,the feedback circuit is designed to ensure the stable output voltage of the front stage.The main power circuit topology of the rear-stage inverter circuit adopts the full-bridge topology,and the main control chip adopts EG8010 to briefly introduce its peripheral circuit design.The driver chip adopts HCPL-316 J,and a bootstrap circuit is designed for the chip.A detailed analysis of the LC filter design was performed.Finally,the prototype is made and tested,key data is recorded and key waveforms are analyzed.The input DC power supply uses a 48 V lead-acid battery pack,and the output power of the battery pack is 9600 W.Test the circuit to verify that the circuit meets the design requirements.