针对功率分配底层功能提出一种新型控制策略,该控制策略在传统的双闭环平均电流均流法上加以改进。首先电流内环修改为功率内环,将电压外环的输出除以输入电压再乘以功率分配系数作为新的功率给定值来实现功率分配功能。同时将自抗扰技术应用到电压外环提高母线电压的响应速度。最后基于模块化思想并利用氮化镓功率开关器件,搭建一台三输入交错并联Boost实验样机,其额定功率为1500 W,额定工作频率为500 kHz,峰值效率为98.3%。实验验证结果表明,在相同输入电压或不同输入电压的情况下均能实现功率分配功能,并具有良好的动态响应。
Abstract
The power supply system of solar UAV needs to keep the SOC of different energy storage batteries consistent at all times, so the DC/DC converter should have the basic function of power distribution to ensure the realization of the algorithm. This paper proposes a new control strategy for the bottom function of power distribution, which is an improvement on the traditional double closed-loop average current sharing method. First, the current inner loop is modified to the power inner loop, and the output of the voltage outer loop is divided by the input voltage and then multiplied by the power distribution coefficient as the new power given value to realize the power distribution function. At the same time, the automatic disturbance rejection technology is applied to the voltage outer loop to improve the response speed of the bus voltage. Finally, based on the modular concept and using GaN power switching devices, a three-input interleaved parallel Boost experimental prototype was built with a rated power of 1500 W, a rated operating frequency of 500 kHz, and a peak efficiency of 98.3%. Through experimental verification, the results show that the power distribution function can be achieved under the same input voltage or different input voltages, and it has a good dynamic response.
关键词
光伏发电 /
氮化镓 /
变换器 /
动态响应 /
高频 /
功率分配
Key words
PV power /
gallium nitride /
converter /
dynamic response /
high frequency /
power distribution
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基金
天津市科技计划（20YDTPJC01520）
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