在光伏直流汇聚与消纳领域,针对双有源桥DC-DC变换器由于回流功率导致效率降低的问题,在扩展移相调制的基础上,提出一种基于移相比坐标变换的回流功率优化调制策略。所提策略简化了不同模式下的传输功率数学模型,给出了回流功率分段优化运行轨迹,保证了传输功率与坐标变换后外移相比的单调性,根据坐标变换后的外移相比寻求最优移相比组合,无需负载侧电流传感器即可实现任意电压变换比下回流功率最优。仿真与实验结果验证了所提方案的有效性。
Abstract
In the field of photovoltaic DC convergence and consumption, for the problem of reduced efficiency of dual active bridge DC-DC converters due to reflux power, on the basis of extended phase-shift modulation, an optimized modulation strategy for reflux power based on phase-shift coordinate transformation is proposed. The proposed strategy simplifies the mathematical model of the transmission power in different modes, and gives a segmented optimized trajectory of the reflux power to ensure the monotonicity of the transmission power compared with the shift after coordinate transformation. The optimal shift-combination combination can realize the optimal reflux power at any voltage conversion ratio without the load-side current sensor. Simulation and experimental results verify the effectiveness of the proposed scheme.
关键词
光伏 /
双有源桥 /
拓展移相 /
回流功率 /
移相比 /
坐标变换
Key words
PV /
dual active bridge /
extended phase shift /
reflux power /
phase shift /
coordinate transformation
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参考文献
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基金
国家重点研发计划（2018YFB1500700）
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