Research On The Key Technology Of The Bidirectional DC/DC Converter For Hybrid Power Generation System

With the energy shortage seriously, petroleum, coal, natural gas and other major energy exhausted. And the traditional energy brings the problem of environment pollution and climate warming. Therefore, new energy had been draw attention by people. Especially solar photovoltaic (PV) systems with the characteristic of being clean, high efficient, and reproducible. The paper researched for main circuit of Buck/Boost bidirectional DC/DC converter based on soft change current network and the control circuit based on TMS320F2812.The paper researched for working principle of Boost/Buck and determine its major component parameters by technical requirements. The structure and parameters of soft change current network was determined by simulation.The control circuit was composed of hardware and software. Sampling circuit parameters of the hardware part was determined according to variation range of current and voltage.The part of software adopts digital PID control algorithm, and design energy management strategy based on cooperation relations of solar panels,lead-acid batteries and fuel cell. In the energy management strategy solar panels charged for lead-acid batteries by Buck circuit.Because of lead-acid batteries characteristic, the charging stage can be divided into constant current and constant voltage. Batteries discharges for load by Boost circuit,and it adopted constant voltage and constant current control.This paper discusses work principle of Boost/Buck bi-directional DC/DC main circuit based on soft change current,digital control circuit base on TMS320F2812and energy management strategy. The parameters of bidirectional DC/DC converter will be modified by analysing results of experiment and simulation.