为了解决传统能源危机和环境污染等问题，新能源产业正在迅速发展，而双向变换器作为提供和储存电能之间的传输纽带，有着体积小、效率高、成本低以及动态性能好等优势，已成为智能微电网、燃料电池、电动汽车、大功率 UPS 等功率等级较大的新能源产业中的重要媒介。为了解决交错并联型双向变换器硬开关和均流问题，同时提高变换器瞬态响应速度，本文将设计一款复合有源钳位双向 Buck/Boost 交错并联型变换器，主要研究工作如下：

本文对复合有源钳位双向 Buck/Boost 交错并联型变换器在 Buck 模式和 Boost 模式下的工作模态进行分析，得到开关管的驱动逻辑以及输出电感与辅助电感的电流波形，基于此，推导得到变换器在不同模式下的直流增益表达式，以及实现软开关的基本条件；通过分析对比现有的均流方法，本文将采用一种双电流内环数字均流策略，并建立复合有源钳位双向 Buck/Boost 交错并联型变换器 Buck 模式和 Boost 模式下的小信号模型，推导出输出电压和输出电流对控制量参数的传递函数，在不同模式下分别设计电流环和电压环 PI 控制对系统进行补偿，通过仿真对比系统补偿前后的频率特性与输出响应曲线，可以发现，加入 PI 控制后提高了系统的响应速度与稳定性，从而验证小信号模型建立的正确性以及 PI 控制的有效性。

最后根据技术指标对复合有源钳位双向 Buck/Boost 交错并联型变换器的主电路以及控制电路进行设计，并搭建试验平台对变换器进行开环和闭环测试，结果表明，该变换器的均流效果较好，且在输入电压扰动和负载扰动下，系统的响应速度较快，达到稳定的时间均在 100ms 以内，且超调量在 5%以内，满足设计要求，同时，变换器在 Buck模式和 Boost 模式下的开关管均可以实现零电压导通，且样机效率最高可达 95%，验证了理论分析的正确性和控制策略的有效性。

In order to solve the problems of traditional energy crisis and environmental pollution,the new energy industry is developing rapidly. As the transmission link between the supply and storage of electric energy, the bidirectional converter has the advantages of small size,high efficiency, low cost and good dynamic performance. It has become an important medium in the new energy industry with large power levels such as smart microgrids, fuel cells,electric vehicles, and high-power UPS. In order to solve the problem of hard switching andcurrent sharing of the interleaved parallel bidirectional converter and improve the transient response speed of the converter, this paper will design a composite active clamp bidirectional Buck/Boost interleaved parallel converter. The main research work is as follows.

In this paper, the working modes of the compound active-clamp bidirectional Buck/Boost interleaved parallel converter in Buck mode and Boost mode are analyzed, and the driving logic of the switch tube and the current waveforms of the output inductor and auxiliary inductor are obtained. Based on this, the derivation The DC gain expressions of the converter in different modes and the basic conditions for realizing soft switching are obtained. By analyzing and comparing the existing current sharing methods, this paper will adopt a dual-current inner loop digital current sharing strategy, and establish a composite active Small-signal models of clamped bidirectional Buck/Boost interleaved parallel converters in Buck mode and Boost mode, deduce the transfer function of output voltage and output current to control parameters, and design current loop and voltage loop PI control respectively in different modes Compensate the system, and compare the frequency characteristics and output response curves before and after the system compensation through simulation. It can be found that the response speed and stability of the system are improved after adding PIcontrol, so as to verify the correctness of the establishment of the small signal model and the effectiveness of the PI control.

Finally, according to the technical indicators, the main circuit and control circuit of the composite active clamp bidirectional Buck/Boost interleaved parallel converter are designed,and a test platform is built to conduct open-loop and closed-loop tests on the converter. The current effect is good, and under the input voltage disturbance and load disturbance, the response speed of the system is fast, the time to reach stability is within 100ms, and the overshoot is within 5%, which meets the design requirements. At the same time, the converter is in the Buck The switches in both mode and boost mode can achieve zero-voltage conduction, and the prototype efficiency can reach up to 95%, which verifies the correctness of the theoretical analysis and the effectiveness of the control strategy.

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